CN104377666A - High-speed trial wiring strategy for ground fault of electric power system and trial wiring circuit topology - Google Patents
High-speed trial wiring strategy for ground fault of electric power system and trial wiring circuit topology Download PDFInfo
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- CN104377666A CN104377666A CN201310375317.9A CN201310375317A CN104377666A CN 104377666 A CN104377666 A CN 104377666A CN 201310375317 A CN201310375317 A CN 201310375317A CN 104377666 A CN104377666 A CN 104377666A
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Abstract
The invention relates to a high-speed trial wiring strategy for a ground fault of an electric power system and a trial wiring circuit topology. According to the high-speed trial wiring strategy for the ground fault of the electric power system and the trial wiring circuit topology, a sampling/recording device is arranged on a bus of a transformer substation, or existing secondary lines are adopted to sample the voltage of the bus; the voltage waveforms, existing before and after the circuit is cut off, of the bus in a certain time period is observed or recorded, and whether the bus is a faulty line or not is judged through waveform characteristics; in this way, a mechanical or electronic power switch can be used for disconnecting the line for a set time period, or in the set power-off time period, the faulty line is cut off instantly after judgment is carried out by adopting a microcomputer, or after the power-off time period, a worker observes the recorded waveform to judge whether the bus is the faulty line or not; in this way, the power-off delay time dt can be set to be quite short and can be set as the shortest time allowing the fault to be distinguished; in addition, the electronic power switch is adopted for high-speed trial wiring, and therefore the time of trial wiring is further shortened. Simulation shows that the high-speed trial wiring strategy and the trial wiring circuit topology for the ground fault of the electric power system can remarkably reduce power failure caused by trial wiring, the power failure time is made to be basically shorter than the trip time of an undervoltage tripping device or a no-voltage tripping device, the undervoltage tripping device or the no-voltage tripping device hardly acts, and the problem of power supply delay is basically solved.
Description
Technical field
The invention belongs to electronic power switch switching and the process of electric power system earth fault, is electronic power switch switching circuit and earth fault high-speed searching specifically.
Background technology
In 10kV electrical network small current neutral grounding system, single-phase earthing is a kind of common fault, mostly occurs at moist, rainy weather.After there is single-phase earthing, fault phase voltage to earth reduces, and the phase voltage of non-faulting two-phase raises, but line voltage is still symmetrical, and thus do not affect the continuous power supply to user, system can run 1 ~ 2h, and this is also the great advantage of small current neutral grounding system.If but electrical network long-time running when there is single phase ground fault, because healthy phases voltage raises, the weak link of insulation may be caused breakdown, develop into phase fault, make fault spread, affect the normal electricity consumption of user.
In the process of earthing wire-selecting, all will be drawn by examination and determine ground path, but examination drawknot fruit is not necessarily desirable, main cause is as described below:
1, small current earthing wire-selecting accuracy rate and earthing mode closely related
The zero-sequence current of small current earthing wire-selecting mainly according to usual faulty line is larger than non-fault line zero-sequence current, utilizes this principle to distinguish fault and non-fault line, thus selects the current local installing line selection apparatus of single-phase earthing circuit.Owing to being subject to CT error, signal disturbing, and circuit length, the impact of the factors such as extinguishing arc line build-out, the circuit ratio found out by Small Electric Current Earthing And Routing Device is lower, particularly for the electric substation of installing arc suppression coil, owing to passing through arc suppression coil compensation earthing capacitance current, earth current is made to become very little, electric arc can horizontal blanking in vain, although improve power supply reliability index, prevent partial earthing point fault spread, but because fault wire earthing capacitance current is by overcompensation, make the change looking up the fault circuit that protective device is difficult to according to zero-sequence current, thus reduce the correctness of line-selected earthing device.Table 1 is the earthing wire-selecting information slip of Jiaxing power supply branch office, and two data in table 1 reflect this situation.
Table 1
2, tradition examination is drawn and is caused unnecessary power failure
Due to the non-all standing of electric substation 10kV system line selection device for low current and the not high factor of Small Electric Current Earthing And Routing Device route selection accuracy, search the large percentage that ground path is taked to try to draw shared by mode, shared 81.25%, so just unavoidably cause power failure expanded range, part is not broken down the meaningless power failure of user of circuit, particularly has high-risk, the responsible consumer of continuity power reguirements to bring safe risk and the loss of economy for some.
3, to deficient, that decompression takes off mouthful device users confession electric delay is housed
10KV system single-phase earthing tries the process of drawing, along with the power failure in short-term of circuit, due to the time requirement considering remote measurement, remote signalling aspect information is uploaded, the time that usual circuit tries to draw is (as circuit fault-free, whole process comprises stops, passes through journey) at about 1 minute, but due to the existence that certain customers' low-pressure side is owed, decompression takes off mouthful device, after losing power supply, in about 5 seconds, action takes off mouth usually, cause high-pressure side power transmission when, low-pressure side is dead electricity still.Add the managerial deficiency of customer substation operator on duty, the Low-voltage Transmission time often postpones.
Current main direction of studying is neutral grounding mode, small current earthing wire-selecting, or is obviously changed by single phase ground fault and be convenient to process, or improves the accuracy rate of earthing wire-selecting.
Summary of the invention
The invention provides a kind of adopt electronic power switch device to carry out circuit topology that high speed route selection tries to draw and strategy is drawn in examination.Examination draws topology to be divided into by transformer access and directly access two kinds at a high speed, be it is characterized in that by transformer access: transformer primary side series connection access supply line, transformer secondary cross-over connection electronic power switch device, electronic power switch device is connected then supply line and is connected, and electronic power switch device turns off then supply line and turns off.Direct access is characterized in that: electronic power switch devices in series access supply line, utilizes the switching characteristic of electronic power switch, replaces arc-suppressing switch to turn off or connect supply line rapidly and carries out examination and draw.
Then be divided into by transformer place in circuit topology as electronic power switching circuit according to thyristor: the bridge-type thyristor switch topology of bridge-type thyristor switch topology, band DC inductance, the positive and negative thyristor topology of access primary side, single-phase bridge thyristor switch topology.
Bridge-type thyristor switch topology is characterized in that: A, B, C phase winding is the winding of variable impedance transformer, former limit series connection access supply line; Thyristor composition rectifier bridge, thyristor 1, thyristor 2 are composed in series first brachium pontis, and tie point place is first intermediate node; Thyristor 3, thyristor 4 are composed in series second brachium pontis, and tie point place is second intermediate node; Thyristor 5, thyristor 6 are composed in series the 3rd brachium pontis, and tie point place is the 3rd intermediate node, and after three brachium pontis parallel connections, two short circuit is as D phase, and three intermediate nodes draw the secondary being connected respectively to A, B, C phase winding, and the another side of winding is connected with D;
Bridge-type thyristor switch topology with DC inductance is characterized in that: be to add the brachium pontis be made up of thyristor D7, D8 with the difference of bridge-type thyristor switch topology, and its intermediate node is as D phase and brachium pontis two ends cross-over connection DC inductance L;
The positive and negative thyristor topology of access primary side is characterized in that: A, B, C phase winding is the winding of variable impedance transformer, former limit series connection access supply line; Thyristor 1 (can regard two thyristor reverse parallel connections as) has half forward and reverse control characteristic, and thyristor 1 is connected across A phase winding secondary, in like manner, and the similar connection of thyristor 2,3;
Single-phase bridge thyristor switch topology is characterized in that: A phase winding is the winding of variable impedance transformer, former limit series connection access supply line; Thyristor 1 and thyristor 2 are connected as a brachium pontis, and two thyristor tie points are as intermediate node; Thyristor 3 and thyristor 4 are connected as another brachium pontis, and two thyristor tie points are as another intermediate node; After two brachium pontis parallel connections, or shorted on both ends, or be connected across brachium pontis two ends after DC inductance fly-wheel diode in parallel; A phase is on the intermediate node being connected across two brachium pontis.
According to thyristor as electronic power switching circuit then directly place in circuit topology be divided into: thyristor examination puller circuit topology, the single-phase bridge thyristor switch topology of the thyristor examination puller circuit topology of directly access, the direct access of band protection switch.
The thyristor examination puller circuit topology of direct access, is characterized in that: two thyristor reverse parallel connections become bidirectional thyristor, and bidirectional thyristor is directly connected in supply line;
The thyristor examination puller circuit topology of the direct access with protection switch, is characterized in that: be directly connected in supply line after bidirectional thyristor parallel protection switch;
Single-phase bridge thyristor switch topology, is characterized in that: thyristor 1 and thyristor 2 are connected as a brachium pontis, and two thyristor tie points are as intermediate node; Thyristor 3 and thyristor 4 are connected as another brachium pontis, and two thyristor tie points are as another intermediate node; After two brachium pontis parallel connections, or shorted on both ends, or be connected across brachium pontis two ends after DC inductance fly-wheel diode in parallel; Brachium pontis intermediate node is directly connected and is accessed supply line.
According to turn-off device as electronic power switch by transformer place in circuit topology be then: the diode bridge topology trying at a high speed the DC side GTO drawn.
The object of this invention is to provide a kind of direct access topology for route selection examination drawstring protection switch, it is characterized in that electronic power switch accesses supply line after in parallel with protection switch.When protection switch closes a floodgate, bypass electronic power switch, makes electronic power switch protected, reduces the difficulty of design protection, and protection switch tripping operation, electronic power switch just drops into, succinctly, rapidly.
The invention provides a kind of folded topology of the electronic power switch for trying at a high speed the power electronic device of drawing, it is characterized in that: N is positive integer, or the electronic power switch series connection adopting N number of parameter close; Or the tube core (power electronic semiconductor chip) of N number of electronic power switch is concentrated the mode be encapsulated in a module by employing by folded topology, the switch of folded topological structure is adopted to replace original electronic power switch; Or become new topology after adopting the switch of folded topological structure to replace original electronic power switch, new topology is concentrated and is encapsulated in a module.Concentrated encapsulation makes each tube core have identical temperature etc. operating mode, and volume reduces; Folded topology, improves N doubly by withstand voltage.
The invention provides the strategy that a kind of high speed is tried to draw, it is characterized in that comprising the steps:
Step 1: record ripple/sample devices starts busbar voltage high-speed sampling
Step 2: n-th circuit (n is positive integer) on tagmeme table is drawn in excision examination; Examination draws tagmeme table by each outlet according to the possibility descending occurring earth fault, and ranked first of earth fault appears in most probable, and second takes second place, and by that analogy, last position is the circuit that least may occur earth fault;
Step 3: if do not adopt two electrically instruction, then skip this step; Or by sampling outlet switch electric current, sampled value is really 0 conduct electrically instruction; Or in arc-suppressing switch installing arc probe, according to electrically indicating, arc light disappearance, as electrically instruction, determines whether circuit excises;
Step 4: wait for the dt moment, the dt moment gets the shortest time being more than or equal to and can distinguishing fault
Step 5: if processed offline, then skip this step; Voltage sample value before and after microcomputer comparison excision circuit, extracts characteristic quantity, judges: if institute's tangent line road belongs to faulty line, then circuit stops using as a servant and jumps to step 7 according to characteristic quantity
Step 6: the power supply recovering circuit
Step 7: record ripple/sample devices stops sampling
Step 8: immediately process according to microcomputer, then skip this step; Voltage sample value before and after comparison excision circuit, extract characteristic quantity, judge: if institute's tangent line road belongs to faulty line according to characteristic quantity, then circuit stops labour.
The invention provides a kind of arc detector for switching electrical instruction, it is characterized in that the probe of described detector is photoconductive detectors, photodiode, junction type photodiode, PIN photodiode, photomultiplier or Avalanche Photo Diode, and the integrated integrated circuit detector on one chip of multiple probe, comprising: CMOS (Complementary Metal-Oxide Semiconductor) and CCD (ChargeCoupled Device) imageing sensor.
Main innovate point of the present invention or beneficial effect are:
1, there is strict industry standard in country to circuit breaker at present, whether allow to add new components and parts, still remain to be discussed, so electronic power switch device can not enter the switch market of 10kV and above to replace mechanical switch, cause electronic power switch only for the switching of power equipment, but not the combined floodgate of operating a switch of supply line;
The present invention utilizes the feature of electronic power switch energy speed-sensitive switch, within being reduced to 0.5 power frequency cycle the mechanical delay of arc-suppressing switch, ground path is determined in very short interruption duration, significantly decrease examination and draw the power failure caused, and make interruption duration substantially be less than deficient, decompression to take off the mouth unit protection trip time, deficient, decompression takes off mouth device and is substantially failure to actuate, basic solution power supply delay issue; This is one of this patent innovative point.
Described mechanical delay refers to that arc-suppressing switch receives the trip signal time to the actual time of breaking electric current, or arc-suppressing switch receives the time of switching signal time to actual power transmission; Whether described examination is drawn and is referred to circuit is disconnected certain hour, during this period of time, disappear according to ground signalling, determines circuit whether ground connection.
2, ground connection examination is at present drawn is adopt mechanical switching device excision circuit, then whether recover normal by SCADA/open3000 system manual observation busbar voltage, whether ground signalling disappears, determine whether excision circuit belongs to ground path, if do not belong to ground path to close again mechanical switch, circuit restores electricity, and examination bracing wire road interruption duration certainly will be caused long;
The present invention or install sampling/wave recording device on substation bus bar, or adopt existing secondary line to the sampling of busbar voltage; Observation or recording circuit excise busbar voltage waveform in certain time of front and back, utilize wave character to judge whether to belong to faulty line; Way like this can adopt machinery or electronic power switch to be offered by breakage of circuit and fix time, or adopt microcomputer immediately to judge instant excision in the interruption duration of this section of setting, or the waveform that artificial observation is recorded after interruption duration is to judge whether to belong to faulty line; So interruption duration just can set quite short, the shortest time can distinguishing fault can be set as; This is the innovative point two of this patent.
Patent accompanying drawing
Fig. 1 is bridge-type thyristor switch topological diagram.
Fig. 2 is bridge-type thyristor switch principle schematic of band DC inductance.
Fig. 3 is the diode bridge topological diagram trying at a high speed the DC side GTO drawn.
Fig. 4 is the positive and negative thyristor topology diagram of access primary side.
Fig. 5 is single-phase bridge thyristor switch topology diagram.
Fig. 6 is that thyristor folds topological diagram one.
Fig. 7 is that thyristor folds topological diagram two.
Fig. 8 is the thyristor examination puller circuit topology of the direct access of band protection switch.
Fig. 9 is the thyristor examination puller circuit topology of directly access.
Figure 10 is that simulation result figure is drawn in examination at a high speed.
Figure 11 is the instant process chart of microcomputer trying at a high speed to draw.
Figure 12 is the processed offline flow chart trying at a high speed to draw.
Figure 13 is the instant process chart of microcomputer of two electrically instructions that examination is at a high speed drawn.
Figure 14 is the processed offline flow chart of two electrically instructions that examination is at a high speed drawn.
Embodiment
The present invention has supplied a kind of examination of the high speed for electric power system single-phase earthing to draw strategy and examination puller circuit, and elaborate below in conjunction with the course of work of accompanying drawing to this structure, following explanation is only exemplary, instead of in order to limit the scope of the invention and apply;
Following explanation adopts thyristor to be example, and its reason is:
1, thyristor is half control device, can only open and can not turn off; Half control device can carry out high speed examination and draw, then GTO, the full control device that IGBT etc. can turn off also can carry out high speed examination and draw, all electronic power switch devices draw Gu can both carry out high speed examination, then described thyristor available power electronic switch replaces, and the stack structure of multiple series connection can be adopted withstand voltage to improve.
2, Successful utilization is in positive and negative 800kV high voltage direct current transmission, positive and negative 500kV engineering, island power transmission engineering back-to-back for thyristor, then thyristor is used for 10kV equipment, and its reliability, higher than 800kV, 500kV DC equipment, does not technically have difficult point.
Fig. 1 is bridge-type thyristor switch topological diagram.In Fig. 1, bridge-type thyristor switch topology, is characterized in that: A, B, C phase winding is the winding of variable impedance transformer, former limit series connection access supply line; Thyristor composition rectifier bridge, thyristor 1, thyristor 2 are composed in series first brachium pontis, and tie point place is first intermediate node; Thyristor 3, thyristor 4 are composed in series second brachium pontis, and tie point place is second intermediate node; Thyristor 5, thyristor 6 are composed in series the 3rd brachium pontis, and tie point place is the 3rd intermediate node, and after three brachium pontis parallel connections, two short circuit is as D phase, and three intermediate nodes draw the secondary being connected respectively to A, B, C phase winding, and the another side of winding is connected with D.Its operation principle is: all thyristors often trigger, and the primary impedance of A, B, C phase winding is almost nil; During fault, all thyristors do not trigger, and thyristor is closed, and now the former limit of A, B, C phase winding presents very large reactance, and supply line's electric current is almost 0, are equivalent to disconnect; When there is short circuit or thunderbolt overcurrent, primary current exceedes set point, and magnetic core penetration depth is saturated, the maximum amplitude of secondary current is restricted, the available protecting equipment of secondary.
Fig. 2 is bridge-type thyristor switch principle schematic of band DC inductance.In Fig. 2, the bridge-type thyristor switch topology of band DC inductance, is characterized in that: be to add the brachium pontis be made up of thyristor D7, D8 with the difference of bridge-type thyristor switch topology, and its intermediate node is as D phase and brachium pontis two ends cross-over connection inductance L but not short circuit.Be with the difference of the operation principle of bridge-type thyristor switch topology, when supply line shoves, inductance L restriction is shoved.
Fig. 3 is the diode bridge topological diagram trying at a high speed the DC side GTO drawn.In Fig. 3, diode D1, D2 are composed in series rectifying bridge arm, and brachium pontis two ends are DC side, D1, D2 tie point is intermediate node, draws as A phase, in like manner diode D3, D4, D5, D6, D7, D8 form three rectifying bridge arms, and intermediate node is drawn as B, C, D phase respectively; The DC side parallel of four brachium pontis; Connect with thyristor G1 after electric capacity C and resistance R parallel connection and be integrated, GTO or IGBT is in parallel with body is one piece, diode D9 is in parallel with inductance L is one group, DC side is connected across after group and block series connection, A, B, C, D tetra-phase adopt the mode same with Fig. 1 to access supply line by transformer series: A, B, C, D tetra-phase employing variable impedance transformer place in circuit, transformer primary side series connection access supply line, transformer pair becomes star-star connection, D phase and transformer secondary neutral point equipotential.Its course of work is: GTO or IGBT conducting, circuit normal power supply; When there is short circuit or shove in circuit, inductance L current limliting, GTO or IGBT turns off, and thyristor G1 triggers simultaneously, due to the existence of electric capacity C, GTO or IGBT soft switching, when electric capacity C terminal voltage rises to rapidly maximum, thyristor terminal voltage is reverse, automatically shuts down; A, B, C, D phase current is kept to 0 rapidly; The energy of electric capacity C is discharged by resistance R, the electric current of inductance L is by diode D9 afterflow; Beneficial effect is after increasing G1, C, R, this equipment energy soft switching, and can close a floodgate immediately after open circuit, is applicable to examination at a high speed and draws.G1 can be replaced mechanical switch.
Fig. 4 is the positive and negative thyristor topological structure of access primary side.In Fig. 4, the positive and negative thyristor topology of access primary side, is characterized in that: A, B, C phase winding is the winding of variable impedance transformer, former limit series connection access supply line; Thyristor 1 (can regard two thyristor reverse parallel connections as) has half forward and reverse control characteristic, and thyristor 1 is connected across A phase winding secondary, in like manner, and the similar connection of thyristor 2,3.Its operation principle is: all thyristors often trigger, and the primary impedance of A, B, C phase winding is almost nil; During fault, all thyristors do not trigger, and thyristor is closed, and now the former limit of A, B, C phase winding presents very big reactance, and supply line is equivalent to disconnect; When there is short circuit or thunderbolt overcurrent, primary current exceedes set point, and magnetic core penetration depth is saturated, the amplitude of secondary current is restricted, the available protecting equipment of secondary.
Fig. 5 is single-phase bridge thyristor switch topological structure.In Fig. 5, single-phase bridge thyristor switch topology, is characterized in that: A phase winding is the winding of variable impedance transformer, former limit series connection access supply line; Thyristor 1 and thyristor 2 are connected as a brachium pontis, and two thyristor tie points are as intermediate node; Thyristor 3 and thyristor 4 are connected as another brachium pontis, and two thyristor tie points are as another intermediate node; Shorted on both ends after two brachium pontis parallel connections; A phase is on the intermediate node being connected across two brachium pontis, and its operation principle is: all thyristors often trigger, and the primary impedance of A phase winding is almost nil; During fault, all thyristors do not trigger, and thyristor is closed, and now the former limit of A phase winding presents very big reactance, and supply line is equivalent to disconnect; When there is short circuit or thunderbolt overcurrent, primary current exceedes set point, and magnetic core penetration depth is saturated, the amplitude of secondary current is restricted, the available protecting equipment of secondary.Thyristor 3,4 can replace with diode, and single-phase bridge thyristor switch topological structure can not adopt variable impedance transformer, and brachium pontis intermediate node is directly connected as equipment two ends and accessed supply line.Fig. 6 is that thyristor folds topological diagram one.In Fig. 6, N is positive integer, the close thyristor of N number of parameter (can regard two thyristor reverse parallel connections as, there is half forward and reverse control characteristic) series connection, N is improve doubly by withstand voltage, also can adopt and the tube core of N number of thyristor (controllable silicon semiconductor chip) is concentrated the mode be encapsulated in a module, make each tube core have identical temperature etc. operating mode, and volume reduces.Because thyristor is normal triggering, do not work in inverter mode, then require very low to the simultaneity of trigger impulse; Described inverter mode refers to, when being in inverter mode, the forward voltage at thyristor two ends be greater than 0 certain value, apply after trigger impulse, turn on thyristors; Pipe for N number of thyristor is folded, if N number of thyristor can not simultaneously conducting, voltage can put on the thyristor two ends of last conducting, when inverse envelope is larger, is easy to puncture this thyristor.
Fig. 7 is that thyristor folds topological diagram two.In Fig. 7, N is positive integer, the Thyristors in series that N number of parameter is close, N is improve doubly by withstand voltage, also can adopt and the tube core of N number of thyristor (controllable silicon semiconductor chip) is concentrated the mode be encapsulated in a module, make each tube core have identical temperature etc. operating mode, and volume reduce.Because thyristor is normal triggering, do not work in inverter mode, then require very low to the simultaneity of trigger impulse.
Fig. 8 is the thyristor examination puller circuit topology of the direct access of protection switch.In Fig. 8, the thyristor examination puller circuit topology of the direct access of band protection switch, is characterized in that: in parallel with protection switch again after thyristor 1,2 reverse parallel connection is one group, and this group is connected between electric substation's outlet and #1 electric pole; Under normal condition, protection switch closes, and thyristor is bypassed, and the electric current of load flows through protection switch, over-voltage and over-current on thyristor without impact; When there is earth fault, thyristor often triggers, and thyristor is open-minded, and protection switch trips, and the electric current of load flows through thyristor; When overhauling thyristor, electric substation changes line maintenance, and #1 lever switch is pulled open in line side, hanging earthing conductor.
Its beneficial effect is: oxide material is the over-voltage protection element that 10kV and above grade are commonly used as overvoltage protection, but its motional impedance is comparatively large, and to the larger impedance of instantaneous overvoltage performance, therefore not separately as protection component, protection seting is comparatively complicated.When protection switch closes a floodgate, bypass electronic power switch, makes electronic power switch protected, reduces the difficulty of design protection.
Fig. 9 is the thyristor examination puller circuit topology of directly access.In Fig. 9, the thyristor examination puller circuit topology of directly access is characterized in that: bidirectional thyristor is directly connected in supply line.Da, Db are directly connected on the outlet of 10kV supply line, power respectively to load A, B, to the circuit not series power electrical switchgear that load C powers, voltage transformer pt is connected to voltage substation bus bar being measured bus (three-phase), record ripple/sample devices carries out triggering sampling to voltage, sets the circuit A phase of powering to load B and metallicity single-phase earthing occurs.
Figure 10 is that simulation result figure is drawn in examination at a high speed, and the circuit topology that emulation adopts is topology shown in Fig. 9.In Figure 10, Da, Db is thyristor Da, the trigger waveform of Db, busbar voltage refers to earth fault phase busbar voltage, it is here A phase, simulation process is: initial time, system A phase ground connection, record ripple/sample devices starts, busbar voltage is less than 1kV, O.1 during second, carry out high speed examination to A phase to draw, record ripple/sample devices is sampled to busbar voltage, trigger impulse Da is 0, thyristor is out of service, load A is cut off, the sampled value of A phase is still less than 1kV, ground signalling does not disappear, after 0.12 second, trigger impulse Da reverts to 1, thyristor resumes operation, load A restores electricity, within 0.15 second, carry out high speed examination to load B to draw, after half cycle, load B is cut off, and the sampled value of A phase returns to higher value, therefore is judged as that A phase ground connection occurs load B, is isolated by load B.
Visible by emulating, the fault characteristic value of single-phase earthing is obvious: if institute's tangent line road belongs to faulty line, next peak value then after circuit excision, A, B, C phase voltage is obviously recovered and close to normal voltage, and adopt electronic power switch device to carry out high speed to try to draw, whole examination is pulled through journey and only continues 1 ~ 2 cycle, time is very short, for the insensitive user of the quality of power supply without impact, for the user being provided with low pressure-off mouth device, interruption duration is less than deficient substantially, decompression takes off the mouth unit protection trip time, owe, decompression takes off mouth device and is substantially failure to actuate, better solution power supply delay issue.
Figure 11 is the instant process chart of microcomputer trying at a high speed to draw, and treatment step is as follows
Step 1: start examination at a high speed and draw
Step 2: record ripple/sample devices starts busbar voltage high-speed sampling
Step 3: n-th circuit (n is positive integer) on tagmeme table is drawn in excision examination; Examination draws tagmeme table by each outlet according to the possibility descending occurring earth fault, and ranked first of earth fault appears in most probable, and second takes second place, and by that analogy, last position is the circuit that least may occur earth fault
Step 4: wait for the dt moment, the dt moment gets the shortest time being more than or equal to and can distinguishing fault
Step 5: the voltage sample value before and after microcomputer comparison excision circuit, extracts characteristic quantity, judges: if institute's tangent line road belongs to faulty line, then circuit stops using as a servant and jumps to step 7 according to characteristic quantity
Step 6: the power supply recovering circuit
Step 7: record ripple/sample devices stops sampling
Step 8: terminate
Figure 12 is the processed offline flow chart trying at a high speed to draw, and is that the step of failure judgement circuit is after the power supply recovering circuit with the main distinction of Figure 11, according to the waveform failure judgement circuit of record wave device record.Treatment step is as follows:
Step 1: start examination at a high speed and draw
Step 2: record ripple/sample devices starts busbar voltage high-speed sampling
Step 3: n-th circuit on tagmeme table is drawn in excision examination
Step 4: wait for the dt moment
Step 5: the power supply recovering circuit
Step 6: record ripple/sample devices stops sampling
Step 7: the voltage sample value before and after comparison excision circuit, extract characteristic quantity, judge: if institute's tangent line road belongs to faulty line according to characteristic quantity, then circuit stops labour
Step 8: terminate
Figure 13 is the instant process chart of microcomputer of two electrically instructions that examination is at a high speed drawn, and is to adopt two electrical specifications determination circuit to excise, is applicable to adopt mechanical switch to carry out the circuit trying to draw with the main distinction of Figure 11.Treatment step is as follows:
Step 1: start examination at a high speed and draw
Step 2: record ripple/sample devices starts busbar voltage high-speed sampling
Step 3: n-th circuit on tagmeme table is drawn in excision examination
Step 4: determine whether circuit excises according to electrically indicating; Or by sampling outlet switch electric current, sampled value is really 0 conduct electrically instruction; Or in arc-suppressing switch installing arc probe, arc light disappears as electrically instruction
Step 5: wait for the dt moment
Step 6: the voltage sample value before and after microcomputer comparison excision circuit, extracts characteristic quantity, judges: if institute's tangent line road belongs to faulty line, then circuit stops using as a servant and jumps to step 8 according to characteristic quantity
Step 7: the power supply recovering circuit
Step 8: record ripple/sample devices stops sampling
Step 9: terminate
Figure 14 is the processed offline flow chart of two electrically instructions that examination is at a high speed drawn, and is to adopt two electrical specifications determination circuit to excise, is applicable to adopt mechanical switch to carry out the circuit trying to draw with the main distinction of Figure 12.Treatment step is as follows
Step 1: start examination at a high speed and draw
Step 2: record ripple/sample devices starts busbar voltage high-speed sampling
Step 3: n-th circuit on tagmeme table is drawn in excision examination
Step 4: determine whether circuit excises according to electrically indicating; Or by sampling outlet switch electric current, sampled value is really 0 conduct electrically instruction; Or in arc-suppressing switch installing arc probe, arc light disappears as electrically instruction
Step 5: wait for the dt moment
Step 6: the power supply recovering circuit
Step 7: record ripple/sample devices stops sampling
Step 8: the voltage sample value before and after comparison excision circuit, extract characteristic quantity, judge: if institute's tangent line road belongs to faulty line according to characteristic quantity, then circuit stops labour
Step 9: terminate
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (7)
1. one kind adopts electronic power switch device to carry out the circuit topology trying at a high speed to draw, examination draws topology to be divided into by transformer access and directly access two kinds at a high speed, accessed by transformer, it is characterized in that: transformer primary side series connection access supply line, transformer secondary cross-over connection electronic power switch device, electronic power switch device is connected then supply line and is connected, electronic power switch device turns off then supply line and turns off, comprise adopt thyristor as electronic power switching circuit by transformer place in circuit topology: bridge-type thyristor switch topology, bridge-type thyristor switch topology with DC inductance, the positive and negative thyristor topology of access primary side, single-phase bridge thyristor switch topology,
Bridge-type thyristor switch topology, is characterized in that: A, B, C phase winding is the winding of variable impedance transformer, former limit series connection access supply line; Thyristor composition rectifier bridge, thyristor 1, thyristor 2 are composed in series first brachium pontis, and tie point place is first intermediate node; Thyristor 3, thyristor 4 are composed in series second brachium pontis, and tie point place is second intermediate node; Thyristor 5, thyristor 6 are composed in series the 3rd brachium pontis, and tie point place is the 3rd intermediate node, and after three brachium pontis parallel connections, two short circuit is as D phase, and three intermediate nodes draw the secondary being connected respectively to A, B, C phase winding, and the another side of winding is connected with D;
Bridge-type thyristor switch topology with DC inductance, it is characterized in that: be to add the brachium pontis be made up of thyristor D7, D8 with the difference of bridge-type thyristor switch topology, its intermediate node is as D phase and brachium pontis two ends cross-over connection DC inductance L;
The positive and negative thyristor topology of access primary side, is characterized in that: A, B, C phase winding is the winding of variable impedance transformer, former limit series connection access supply line; Thyristor 1 (can regard two thyristor reverse parallel connections as) has half forward and reverse control characteristic, and thyristor 1 is connected across A phase winding secondary, in like manner, and the similar connection of thyristor 2,3;
Single-phase bridge thyristor switch topology, is characterized in that: A phase winding is the winding of variable impedance transformer, former limit series connection access supply line; Thyristor 1 and thyristor 2 are connected as a brachium pontis, and two thyristor tie points are as intermediate node; Thyristor 3 and thyristor 4 are connected as another brachium pontis, and two thyristor tie points are as another intermediate node; After two brachium pontis parallel connections, or shorted on both ends, or be connected across brachium pontis two ends after DC inductance fly-wheel diode in parallel; A phase is on the intermediate node being connected across two brachium pontis.
2. one kind adopts electronic power switch device to carry out the circuit topology trying at a high speed to draw, examination draws topology to be divided into by transformer access and directly access two kinds at a high speed, direct access, it is characterized in that: electronic power switch devices in series access supply line, utilize the switching characteristic of electronic power switch, arc-suppressing switch is replaced to turn off rapidly or connect supply line, comprise the direct place in circuit topology adopting thyristor as electronic power switching circuit: the thyristor examination puller circuit topology of directly access, the thyristor examination puller circuit topology of the direct access with protection switch, single-phase bridge thyristor switch topology,
The thyristor examination puller circuit topology of direct access, is characterized in that: two thyristor reverse parallel connections become bidirectional thyristor, and bidirectional thyristor is directly connected in supply line;
The thyristor examination puller circuit topology of the direct access with protection switch, is characterized in that: be directly connected in supply line after bidirectional thyristor parallel protection switch;
Single-phase bridge thyristor switch topology, is characterized in that: thyristor 1 and thyristor 2 are connected as a brachium pontis, and two thyristor tie points are as intermediate node; Thyristor 3 and thyristor 4 are connected as another brachium pontis, and two thyristor tie points are as another intermediate node; After two brachium pontis parallel connections, or shorted on both ends, or be connected across brachium pontis two ends after DC inductance fly-wheel diode in parallel; Brachium pontis intermediate node is directly connected and is accessed supply line.
3. one kind is tried at a high speed the diode bridge topology of the DC side GTO drawn, it is characterized in that: diode D1, D2 are composed in series rectifying bridge arm, brachium pontis two ends are DC side, D1, D2 tie point is intermediate node, draw as A phase, in like manner diode D3, D4, D5, D6, D7, D8 form three rectifying bridge arms, and intermediate node is drawn as B, C, D phase respectively; The DC side parallel of four brachium pontis; Connect with thyristor G1 after electric capacity C and resistance R parallel connection and be integrated, GTO or IGBT is in parallel with body is one piece, diode D9 is in parallel with inductance L is one group, DC side is connected across after group and block series connection, A, B, C, D tetra-phase adopt variable impedance transformer place in circuit, transformer primary side series connection access supply line, transformer pair becomes star-star connection, D phase and transformer secondary neutral point equipotential; Thyristor G1 can be replaced mechanical switch.
4., for a direct access topology for route selection examination drawstring protection switch, it is characterized in that, after electronic power switch is in parallel with protection switch, access supply line; Bypass electronic power switch when protection switch closes a floodgate, protection switch trips, and electronic power switch puts into operation.
5., for trying at a high speed a folded topology for the electronic power switch drawn, it is characterized in that: N is positive integer, or the electronic power switch series connection adopting N number of parameter close; Or the tube core (power electronic semiconductor chip) of N number of electronic power switch is concentrated the mode be encapsulated in a module by employing by folded topology, the switch of folded topological structure is adopted to replace original electronic power switch; Or become new topology after adopting the switch of folded topological structure to replace original electronic power switch, new topology is concentrated and is encapsulated in a module.
6. try at a high speed the strategy drawn, it is characterized in that comprising the steps:
Step 1: record ripple/sample devices starts busbar voltage high-speed sampling
Step 2: n-th circuit (n is positive integer) on tagmeme table is drawn in excision examination; Examination draws tagmeme table by each outlet according to the possibility descending occurring earth fault, and ranked first of earth fault appears in most probable, and second takes second place, and by that analogy, last position is the circuit that least may occur earth fault
Step 3: if do not adopt two electrically instruction, then skip this step; Or by sampling outlet switch electric current, sampled value is really 0 conduct electrically instruction; Or in arc-suppressing switch installing arc probe, according to electrically indicating, arc light disappearance, as electrically instruction, determines whether circuit excises
Step 4: wait for the dt moment, the dt moment gets the shortest time being more than or equal to and can distinguishing fault
Step 5: if processed offline, then skip this step; Voltage sample value before and after microcomputer comparison excision circuit, extracts characteristic quantity, judges: if institute's tangent line road belongs to faulty line, then circuit stops using as a servant and jumps to step 7 according to characteristic quantity
Step 6: the power supply recovering circuit
Step 7: record ripple/sample devices stops sampling
Step 8: immediately process according to microcomputer, then skip this step; Voltage sample value before and after comparison excision circuit, extract characteristic quantity, judge: if institute's tangent line road belongs to faulty line according to characteristic quantity, then circuit stops labour.
7. the arc detector indicated for 10kV and above switching electrical, it is characterized in that, the probe of described detector is photoconductive detectors, photodiode, junction type photodiode, PIN photodiode, photomultiplier or Avalanche Photo Diode, and the integrated integrated circuit detector on one chip of multiple probe, comprising: CMOS (Complementary Metal-Oxide Semiconductor) and CCD (Charge Coupled Device) imageing sensor.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114465219A (en) * | 2020-11-10 | 2022-05-10 | 贝克休斯油田作业有限责任公司 | Discharge reduction in sealed components |
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