CN103529344A - Method for detecting intermittent high-resistance grounding fault through intermittent detection - Google Patents
Method for detecting intermittent high-resistance grounding fault through intermittent detection Download PDFInfo
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Abstract
The invention relates to a method for detecting an intermittent high-resistance grounding fault through intermittent detection and belongs to the field of emergency protection circuit devices. The method comprises the steps that detected forward fault pulses of intermittent power counted within a preset time window and the result of pulse counting is compared with a preset counting threshold when the timing is ended; if a counted value exceeds the preset counting threshold, a fierce transient state is deemed to occur within short time and a relay protection system gives out an alarm of the detected grounding fault as the intermittent high-resistance fault. The method for detecting the intermittent high-resistance grounding fault through intermittent detection has the advantages that the intermittent high-resistance grounding fault can be detected more sensitively, the faulted line can be removed, the sensitivity of a power supply line protection device is improved, the protection effect of the existing relay protection system/device is fully exerted, the continuous and stable operation of the entire medium-voltage power distribution system is improved and the safety performance of the entire power supply system is guaranteed. The method can be widely used in the field of high-resistance grounding fault detection and the relay protection of the medium-voltage power distribution system with a neutral point which is effectively grounded.
Description
Technical field
The invention belongs to emergency protection circuit device for electric field, relate in particular to a kind of detection/guard method for cable or line system high resistance earthing fault.
Background technology
In China's electric system, nominal voltage 1kV and following alternating voltage tier definition, be low pressure, alternating voltage tier definition nominal voltage 1kV is above, below 330kV is high pressure, nominal voltage 330kV and alternating voltage tier definition above, below 1000kV, being UHV (ultra-high voltage), is extra-high voltage nominal voltage 1000kV and above alternating voltage tier definition; In the normative document of IEEE-USA (Institute of Electrical and Electronic Engineers, IEEE), the electric pressure of 2.4kV to 69kV is called to middle pressure; In the regulatory documents of China State Grid Corporation of China (State Grid), the above electric pressure to 20kV of 1kV is called to middle pressure.
It is abnormal that electric system earth fault refers to that energized conductor (pole line, cable etc.) occurs, and the fault being short-circuited through the earth, is modal failure mode in electric system.
Earth fault is because be to form fault loop through the earth, and trouble spot is the one end in loop, and the earth point of system self is the other one end in loop.Therefore, study earth fault, first want the earthing mode of clear and definite electric system itself.
Three-phase electrical power system is through the neutral ground of system itself, be divided into generally effective grounding (being neutral-point solid ground or process low resistance grounding) and two kinds of modes of non-effective earthing (isolated neutral, through excessive resistance eutral grounding with through grounding through arc).Its middle and high voltage transmission system considers mostly to adopt the earthing mode of neutral point effective grounding for superpotential and insulation, and intermediate distribution system situation more complicated, the demand different according to reality, various earthing modes all likely adopt.
In addition, another problem that earth fault is paid close attention to is the resistance of trouble spot: when energized conductor and the earth directly or indirectly pass through other object contact, not often desirable metallic short circuit, and can be with phenomenons such as certain excessive resistance, electric arc or intermittences.These complicated phenomenons are generally all only used as a simple resistance and are represented in traditional relay protection system/device.
In high-pressure system, because earth fault voltage is high, the electric current steady-state quantity that fault causes is large, and stable state fault signature is obvious, and such simplification can not bring very large impact to fault detect.
But in intermediate distribution system; voltage is lower; stable fault currents is less; feature is not obvious; in addition trouble spot non-metal earthing, trouble spot resistance is larger, and with unsettled intermittent ground connection; just possibly cannot produce enough fault currents, bring very large difficulty to protective device detection of ground faults.
To sum up, in intermediate distribution system, earthing mode is complicated, and fault current is less, and the problem of Earth Fault Detection is especially complicated.But because in distribution system, overhead line structures are low simultaneously, and distance between centers of tracks is little, and wire is in branch, the palp scope of buildings, and the chance that earth fault occurs with this class medium contact increases greatly.Therefore Earth Fault Detection is the difficult point Important Problems in intermediate distribution system always.
Because Neutral Grounding Method of Power Distribution System is complicated, and earthing mode has directly determined fault loop and fault current, in adopting the intermediate distribution system of isolated neutral, singlephase earth fault does not form fault loop in theory, can not produce the short-circuit current of stable state, only have by distributed capacitance and form faint capacitance current; If system has adopted neutral point through the earthing mode of grounding through arc, faint capacitive fault current also can be fallen by compensation, and such configuration itself wishes that earth fault can automatic distinguishing or reduce singlephase earth fault to the impact of powering exactly.
In this system, detect ground path very difficult, but just because of system neutral has high impedance, when earth fault occurs, the residual voltage on bus has skew, fault is can be found, is and does not know that on bus, fault has occurred that feeder line.Earth Fault Detection problem in this system belongs to the category of small current earthing wire-selecting research.
In adopting the intermediate distribution system of neutral point effective grounding (directly ground connection or low resistance grounding).Impedance in fault loop after earth fault is little; fault mostly can not automatic distinguishing, needs the overcurrent protection action could be fault clearance (wishing that overcurrent protection action excision fault is in fact also one of the object that adopts the earthing mode of neutral point effective grounding).
But if there is higher fault resstance in trouble spot, it is little that non-conductive mediums such as branch, dry soil can limit earth-fault current.Fault current, lower than the threshold value of overcurrent protection, cannot detect and remove by protected device.Therefore, this earth fault just probably cannot be found for a long time.Fault sustained combustion meeting brings the very serious harm such as electric shock, fire.
Exactly because in such system, high resistance earthing fault can sustainable existence, it is very large to be discovered, endanger, high resistance earthing fault problem is generally just defined within the intermediate distribution system of neutral point effective grounding.
Table 1.1 provides in direct ground connection presses in (12.5kV) distribution system high resistance earthing fault at the current value of the typical stable state of different dielectric surfaces: general high resistance earthing fault electric current can be less than 50A, lower than overcurrent protection in relay protection system/device or the minimum action threshold value of fuse.
Table 1.1 12.5kV high resistance earthing fault typical electrical flow valuve
| Medium | Electric current (ampere) |
| Dry pitch/concrete/sand ground | 0 |
| Moist sand ground | 15 |
| Dry turf | 20 |
| Dry meadow | 25 |
| Moist turf | 40 |
| Moist meadow | 50 |
| Reinforced concrete | 75 |
So IEEE; (the Power System Relaying Committee of the relay protection of power system council; PSRC) definition is pointed out; high resistance earthing fault (High Impedance Fault, HIF) is that the fault via nonmetal character conducting medium (road surface, earth, branch etc.) ground connection has occurred the distribution line in neutral point effective grounding.
In the definition of high resistance earthing fault, faint, the traditional overcurrent protective device of fault current be can't detect to fault and be all defined as high resistance earthing fault, the most significantly feature having under different situations according to high resistive fault is classified, the cardinal rule of classification comes from several situations that traditional overcurrent protection can not correctly detect fault, that is: 1) fault current amplitude is too low can not start overcurrent protective device; 2) fault current is intermittent occurs, causes protection not arrived with regard to automatic resetting in the action delay time.
Intermittent earth fault is wherein that existing Over Current Protection System/device is difficult to the class earth fault detecting; although the fault current of intermittent defect may starting protection device, because fault is extinguished very soon and made overcurrent protective device " involution " and fault cannot be detected or send corresponding alerting signal.
In the past, the neutral point of China 10～35kV distribution system generally adopted non-effective earthing mode, do not have high resistance earthing fault problem defined above, so attention degree was inadequate, studied also abundant not.
But system with non-effectively earthed neutral also has a lot of drawbacks, as overvoltage problem, ground arc current problems etc., more and more can not be accepted by modern electric user.
Since the extensive city net in latter stage in last century, the upgrading of rural power grids, China coast big city starts the distribution system of neutral non-effective grounding to change system with effectively earthed neutral into successively.Also or prepare to adopt the system earth mode (through low resistance grounding) of neutral point effective grounding, current this trend is also in development for large-scale important power consumers.
Neutral point adopts after effective grounding mode, if while there is the short circuit grounding fault of low-resistance, the overcurrent protection in existing relay protection system/unit can move and excise faulty line at once, can effectively prevent the expansion of fault and spread.And the high resistance earthing fault that traditional protection method is difficult to detect is the difficulties in this type systematic.Therefore, research high resistance earthing fault detects, and for the distribution system that guarantees that China is newly-built, reconstructs and even the safety of whole electric system, all has real necessity.
Summary of the invention
Technical matters to be solved by this invention is to provide the method that a kind of employing " intermittent detection " detects intermittent high resistance earthing fault; it is to intermittent defect; down pulse by the instantaneous power positive dirction to detecting carries out amplitude detection and step-by-step counting; determine that intermittent high resistance earthing fault occurs on certain circuit; and locking is not reported to the police on non-fault line; and then the sensitivity of raising supply line protective device, the safe and stable operation of assurance electric power system.
Technical scheme of the present invention is: provide a kind of employing " intermittent detection " to detect the method for intermittent high resistance earthing fault, it is characterized in that described detection method at least comprises the following steps:
The current output value of each zero sequence current mutual inductor in all outlets on the same bus of A, Real-time Collection or detection system, obtains fault component average current amplitude data;
B, upgrade current fault component average current amplitude, simultaneously according to the amplitude of two cycle fault components, judge whether to enter next step;
If C two cycle current amplitudes are greater than amplitude, start threshold value, enter " startup " stage, the average amplitude before startup is stored, as the load condition before fault;
D, start a timer and start timing, a counter is counted the pulse of the instantaneous power positive dirction detecting simultaneously;
E, when starting timer timing and finish, the result of impulse meter and predetermined count threshold are compared;
If F umber of pulse surpasses predetermined count threshold, output " satisfying condition " status signal, is directly reported as intermittent high resistance earthing fault; Otherwise according to other situation (transient fault, stable state or noise), process,
Relay protection system/the device of G, system, the event of failure report according to corresponding, starts corresponding handling procedure.
System described in it is the distribution system of the radial neutral point effective grounding of single supply.
After described intermittent detection method is by " startup ", in the time window of a pre-set startup timer timing, start the down pulse counting of the instantaneous power positive dirction to detecting, when the timing of startup timer finishes, the result of the counting of paired pulses and a predefined threshold value are compared; In the time window presetting, if this count value surpasses count threshold, just to think in the short time fierce transient state has occurred, relay protection system/device will be just used as detected earth fault as intermittent high resistive fault and report to the police.
First described detection method calculates fault component electric current and voltage, if fault component current amplitude is greater than, start threshold value, start subsequent processing steps, voltage current waveform based on before fault initiating calculates fault component current/voltage, again by fault component voltage current waveform, calculate instantaneous reactive, and then obtain fault direction.
Described detection method is in the system of neutral resistor ground connection or insulation, utilize instantaneous reactive failure judgement direction, if flowing to circuit from bus is positive dirction, when instantaneous reactive is when being positive, fault occurs in positive dirction, occur on this circuit, otherwise fault occurs on All other routes or bus.
Described amplitude startup threshold value is 0.5 times of this branch road zero-sequence current protection setting valve, and described count threshold is 3 times.
If the lasting time of described " satisfying condition " status signal surpasses " earth fault time threshold ", there is earth fault in report directly;
If the described lasting time of " satisfying condition " status signal does not reach " earth fault time threshold ", be used as a transient event report, and continue to wait for;
If within default reset time, there is continuously above transient event three times, think intermittent grounding fault has occurred, otherwise report the result according to transient event, and do not do alarm and any processing.
Compared with the prior art, advantage of the present invention is:
1. by the statistics of the umber of pulse of zero-sequence current amplitude and the instantaneous power positive dirction that detects with compare with predetermined threshold values; obtain " startup " signal; trigger condition is succinct; reliable operation; can detect intermittent high resistance earthing fault, and then improve the sensitivity of supply line's protective device.
2. for intermittent high resistance earthing fault; provided and utilized zero-sequence current amplitude and the detection method of occurrence number at the appointed time; in the system of neutral point effective grounding; given full play to the protective effect of existing relay protection systems/devices; contribute to improve continuous, the stable operation of whole intermediate distribution system, guarantee the security performance of whole electric power system.
Accompanying drawing explanation
Fig. 1 is the block diagram of detection method of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
Intermittent high resistance earthing fault detects and is mainly used to identification because fault ground intermittently occurs, the fault that causes protection " involution " to detect, simultaneously because the fault intermittently occurring mostly contains a large amount of high frequency contents, by distributed capacitance, also can perfect the larger disturbance of generation on circuit, need to be to faulty line identification in addition; What intermittent defect detected concern is the variation of zero-sequence current amplitude.
Therefore,, in the technical program, the emphasis that intermittent high resistance earthing fault detects just utilizes zero-sequence current amplitude to carry out identification of defective circuit.
In Fig. 1, provided the block diagram of detection method of the present invention.
In the fault loop of neutral point disresonance earthed system (isolated neutral or process resistance eutral grounding), regulation is positive dirction from bus Dao Zhi road, otherwise is negative direction.
According to the definition of typical power, capacitive branch produces idle simultaneously, and inductive branch consumes idle, and resistance branch consumption is meritorious.
The technical program provides a kind of employing " intermittent detection " to detect the method for intermittent high resistance earthing fault, and the detection method described in it at least comprises the following steps:
The current output value of each zero sequence current mutual inductor on all outlet branch roads on the same bus of A, Real-time Collection or detection system, obtains the amplitude I of current output value
aMP, the mean value that it is asked to two cycles, obtains fault component average current amplitude I
aVGdata;
B, upgrade current fault component average current amplitude, simultaneously according to the amplitude I of two cycle fault components
aVGor amplitude increment I
sT, judge whether to enter next step;
If the amplitude I of C two cycle fault components
aVGor amplitude increment I
sTbe greater than amplitude and start threshold value, enter " startup " stage, the average amplitude before startup is stored, as the load condition before fault;
D, start a timer and start timing, a counter is counted the pulse of the instantaneous power positive dirction detecting simultaneously;
E, when starting timer timing and finish, the result of impulse meter and predetermined count threshold are compared;
If F umber of pulse surpasses predetermined count threshold, output " satisfying condition " status signal (or set " high resistive fault " sign), is directly reported as intermittent high resistance earthing fault; Otherwise process according to other situation (transient fault, stable state or noise);
Relay protection system/the device of G, system, the event of failure report according to corresponding, starts corresponding handling procedure.
System described in it is the distribution system of the radial neutral point effective grounding of single supply.
After described intermittent detection method is by " startup ", in the time window of a pre-set startup timer timing, start the down pulse counting of the instantaneous power positive dirction to detecting, when the timing of startup timer finishes, the result of the counting of paired pulses and a predefined threshold value are compared; In the time window presetting, if this count value surpasses count threshold, just to think in the short time fierce transient state has occurred, relay protection system/device will be just used as detected earth fault as intermittent high resistive fault and report to the police.
First described detection method calculates fault component electric current and voltage, if fault component current amplitude is greater than, start threshold value, start subsequent processing steps, voltage current waveform based on before fault initiating calculates fault component current/voltage, again by fault component voltage current waveform, calculate instantaneous reactive, and then obtain fault direction.
Described detection method is in the system of neutral resistor ground connection or insulation, utilize instantaneous reactive failure judgement direction, if flowing to circuit from bus is positive dirction, when instantaneous reactive is when being positive, fault occurs in positive dirction, occur on this circuit, otherwise fault occurs on All other routes or bus.
Described amplitude startup threshold value is 0.5 times of this branch road zero-sequence current protection setting valve, and described count threshold is 3 times.
If the lasting time of described " satisfying condition " status signal surpasses " earth fault time threshold ", there is earth fault in report directly;
If the described lasting time of " satisfying condition " status signal does not reach " earth fault time threshold ", be used as a transient event report, and continue to wait for;
If within default reset time, there is continuously above transient event three times, think intermittent grounding fault has occurred, otherwise report the result according to transient event, and do not do alarm and any processing.
What intermittent defect detected concern is the variation of zero-sequence current amplitude.
And in intermittent defect, such zero-sequence current variation shows as a plurality of pulse signals (fault is lighted and extinguished).After intermittent detection method is by " startup ", in the time window of a pre-set startup timer timing, start the down pulse counting of the positive dirction to detecting, when the timing of startup timer finishes, the result of the counting of paired pulses and a predefined threshold value are compared.
In the time window presetting, if this count value surpasses threshold value, to think in the short time fierce transient state has occurred, algorithm will be reported to the police with regard to being used as intermittent high resistive fault.
So, the technical program can be divided into two stages, in the ready stage (representing with READY in figure), upgrade the current average zero sequence current amplitude of each outlet branch road (or loop), according to the amplitude of two cycle fault components, judge whether to start subsequent step simultaneously, if two cycle fault component current amplitudes are greater than, start threshold value, the unloading phase that algorithm entering, (in figure, with START, represent), the average amplitude before startup is stored, as the load condition before fault.
Unloading phase, start timer and start timing, a counter is counted the pulse of the positive dirction detecting simultaneously, when the timing of startup timer finishes, the result of impulse meter and a series of threshold, if umber of pulse is too much, is reported as intermittent high resistance earthing fault, otherwise processes according to other situation (transient fault, stable state or noise).
Because the present invention is in the system of neutral resistor ground connection or insulation, step-by-step counting to forward, in detection time cut-off and preset threshold value failure judgement relatively, intermittent high resistance earthing fault excision faulty line in time can be detected more delicately; Can on faulty line, move and report to the police selectively; and locking protective relaying device is not reported to the police on non-fault line; and then improved the sensitivity of supply line's protective device; given full play to the protective effect of existing relay protection systems/devices; contribute to improve continuous, the stable operation of whole intermediate distribution system, guarantee the security performance of whole electric power system.
The high resistance earthing fault that the present invention can be widely used in the intermediate distribution system of neutral point effective grounding detects and relay protection field.
Claims (7)
1. adopt " intermittent detection " to detect a method for intermittent high resistance earthing fault, it is characterized in that described detection method at least comprises the following steps:
The current output value of each zero sequence current mutual inductor on all outlet branch roads on the same bus of A, Real-time Collection or detection system, obtains fault component average current amplitude data;
B, upgrade current fault component average current amplitude, simultaneously according to the amplitude of two cycle fault components, judge whether to enter next step;
If C two cycle current amplitudes are greater than amplitude, start threshold value, enter " startup " stage, the average amplitude before startup is stored, as the load condition before fault;
D, start a timer and start timing, a counter is counted the pulse of the instantaneous power positive dirction detecting simultaneously;
E, when starting timer timing and finish, the result of impulse meter and predetermined count threshold are compared;
If F umber of pulse surpasses predetermined count threshold, output " satisfying condition " status signal, is directly reported as intermittent high resistance earthing fault; Otherwise according to other situation (transient fault, stable state or noise), process,
Relay protection system/the device of G, system, the event of failure report according to corresponding, starts corresponding handling procedure.
2. according to employing claimed in claim 1 " intermittent detection ", detect the method for intermittent high resistance earthing fault, it is characterized in that described system is the distribution system of the radial neutral point effective grounding of single supply.
3. according to employing claimed in claim 1 " intermittent detection ", detect the method for intermittent high resistance earthing fault, it is characterized in that after described intermittent detection method is by " startup ", in the time window of a pre-set startup timer timing, start the down pulse counting of the instantaneous power positive dirction to detecting, when the timing of startup timer finishes, the result of the counting of paired pulses and a predefined threshold value are compared; In the time window presetting, if this count value surpasses count threshold, just to think in the short time fierce transient state has occurred, relay protection system/device will be just used as detected earth fault as intermittent high resistive fault and report to the police.
4. according to employing claimed in claim 1 " intermittent detection ", detect the method for intermittent high resistance earthing fault, it is characterized in that first described detection method calculates fault component electric current and voltage, if fault component current amplitude is greater than, start threshold value, start subsequent processing steps, voltage current waveform based on before fault initiating calculates fault component current/voltage, again by fault component voltage current waveform, calculate instantaneous reactive, and then obtain fault direction.
5. according to employing claimed in claim 1 " intermittent detection ", detect the method for intermittent high resistance earthing fault, it is characterized in that described detection method is in the system of neutral resistor ground connection or insulation, utilize instantaneous reactive failure judgement direction, if flowing to circuit from bus is positive dirction,, when instantaneous reactive is when being positive, fault occurs in positive dirction, occurs on this circuit, otherwise fault occurs on All other routes or bus.
6. according to employing claimed in claim 1 " intermittent detection ", detect the method for intermittent high resistance earthing fault, it is characterized in that described amplitude starts threshold value for 0.5 times of this branch road zero-sequence current protection setting valve, described count threshold is 3 times.
7. according to employing claimed in claim 1 " intermittent detection ", detect the method for intermittent high resistance earthing fault, if it is characterized in that, the lasting time of described " satisfying condition " status signal is over " earth fault time threshold ", and directly earth fault has occurred in report;
If the described lasting time of " satisfying condition " status signal does not reach " earth fault time threshold ", be used as a transient event report, and continue to wait for;
If within default reset time, there is continuously above transient event three times, think intermittent grounding fault has occurred, otherwise report the result according to transient event, and do not do alarm and any processing.
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| CN104297615A (en) * | 2014-09-24 | 2015-01-21 | 国家电网公司 | Method for detecting intermittent ground fault on basis of zero-sequence current randomness recognition |
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| WO2015161651A1 (en) * | 2014-04-24 | 2015-10-29 | 江苏省电力公司常州供电公司 | Adaptive monitoring method for grounding current of power cable |
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| CN107632235A (en) * | 2017-07-21 | 2018-01-26 | 河北旭辉电气股份有限公司 | A kind of identification device of faulty line of small resistance grounding system and recognition methods |
| CN108037402A (en) * | 2017-11-20 | 2018-05-15 | 华南理工大学 | A kind of small resistance grounding system single-phase high-impedance detection method |
| CN108267671A (en) * | 2017-12-29 | 2018-07-10 | 华中科技大学 | A kind of power grid high resistance earthing fault detection method and system |
| CN108923395A (en) * | 2018-07-02 | 2018-11-30 | 广西电网有限责任公司电力科学研究院 | A kind of logical method handling intermittent arc-earth fault |
| CN109085455A (en) * | 2017-12-26 | 2018-12-25 | 贵州电网有限责任公司 | A kind of determination method for distribution line high resistance earthing fault |
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| CN111025187A (en) * | 2019-12-27 | 2020-04-17 | 广东电网有限责任公司电力科学研究院 | Ground fault early warning method, device and equipment and storage medium |
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| WO2015161651A1 (en) * | 2014-04-24 | 2015-10-29 | 江苏省电力公司常州供电公司 | Adaptive monitoring method for grounding current of power cable |
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| CN104375061A (en) * | 2014-12-02 | 2015-02-25 | 国网上海市电力公司 | Intermittent grounding fault detection system of power distribution network |
| CN107632235A (en) * | 2017-07-21 | 2018-01-26 | 河北旭辉电气股份有限公司 | A kind of identification device of faulty line of small resistance grounding system and recognition methods |
| CN107516878A (en) * | 2017-08-23 | 2017-12-26 | 广州供电局有限公司 | Intermittent high resistance earthing protecting method and system |
| CN108037402A (en) * | 2017-11-20 | 2018-05-15 | 华南理工大学 | A kind of small resistance grounding system single-phase high-impedance detection method |
| CN109085455A (en) * | 2017-12-26 | 2018-12-25 | 贵州电网有限责任公司 | A kind of determination method for distribution line high resistance earthing fault |
| CN108267671B (en) * | 2017-12-29 | 2019-10-29 | 华中科技大学 | A kind of power grid high resistance earthing fault detection method and system |
| CN108267671A (en) * | 2017-12-29 | 2018-07-10 | 华中科技大学 | A kind of power grid high resistance earthing fault detection method and system |
| CN108923395A (en) * | 2018-07-02 | 2018-11-30 | 广西电网有限责任公司电力科学研究院 | A kind of logical method handling intermittent arc-earth fault |
| CN108923395B (en) * | 2018-07-02 | 2019-07-30 | 广西电网有限责任公司电力科学研究院 | A kind of logical method handling intermittent arc-earth fault |
| CN110108972A (en) * | 2019-06-26 | 2019-08-09 | 云南电网有限责任公司电力科学研究院 | A kind of arc method for measuring of single-phase high-impedance |
| CN110780234A (en) * | 2019-12-06 | 2020-02-11 | 广东电网有限责任公司 | High-resistance grounding fault detection method and device |
| CN111025187A (en) * | 2019-12-27 | 2020-04-17 | 广东电网有限责任公司电力科学研究院 | Ground fault early warning method, device and equipment and storage medium |
| CN111025187B (en) * | 2019-12-27 | 2021-07-30 | 广东电网有限责任公司电力科学研究院 | Ground fault early warning method, device and equipment and storage medium |
| CN113341206A (en) * | 2021-06-21 | 2021-09-03 | 广东电网有限责任公司 | Method and device for determining steps of GIS double-bus parallel current |
| CN113341206B (en) * | 2021-06-21 | 2022-03-04 | 广东电网有限责任公司 | Method and device for determining steps of GIS double-bus parallel current |
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