CN103490384A - Multi-generator ship intermediate voltage electric power system protection method and device - Google Patents
Multi-generator ship intermediate voltage electric power system protection method and device Download PDFInfo
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- CN103490384A CN103490384A CN201310423013.5A CN201310423013A CN103490384A CN 103490384 A CN103490384 A CN 103490384A CN 201310423013 A CN201310423013 A CN 201310423013A CN 103490384 A CN103490384 A CN 103490384A
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Abstract
The invention relates to a multi-generator ship intermediate voltage electric power system protection method and device. The method comprises the steps that a busbar of a ship intermediate voltage electric power system is connected with a grounding transformer which is connected with a resonance grounding device, each generator neutral point in the ship intermediate voltage electric power system is connected with a high-resistance grounding device, and the resistance value of the high-resistance grounding device is determined according to a multi-tapping mode. The high-resistance grounding device and the resonance grounding device are connected in parallel, so that protection is effectively provided for an intermediate voltage generator and the electric power system, and meanwhile the mixed grounding mode can be effectively used in the complex working conditions such as multi-generator parallel separation.
Description
Technical field
The present invention relates to ship intermediate voltage power system resist technology field, be specifically related to the guard method of a kind of multiple generator ship intermediate voltage power system and device.
Background technology
In network of ship, the ratio of single phase ground fault all is greater than 50%, and wherein the single phase ground fault more than 90% can produce electric arc.The electric arc overvoltage that single-phase earthing produces, can affect the insulation against ground of healthy phases cable, and single phase ground fault is easy to worsen into phase-to phase fault, thereby affects system power supply reliability and continuity.
The earthing mode of the single phase ground fault extent of injury and processing mode and neutral point of electric network is closely related.High Resistance Grounding Mode requires the high resistance grounding device can operate with failure 2 hours (high resistance refers to that resistance is 100-400 ohm), and can be by Overvoltage suppressing below 2.6 times.This just requires the high resistance grounding current in the fault point to be less than 10A, and the resistance of earth resistance must be less than the system capacitive reactance value.By analytical calculation, obtain high resistance grounding and be only applicable to electric capacity and be less than the 5.9uF system, inapplicable during large electric capacity.Low resistance earthing is over-voltage suppression effectively, but current in the fault point excessive (reaching 400A), easy infringement equipment, and in low resistance grounding mode, the infringement to generator is calculated, even after generator generation earth fault, switch trips immediately, the fault energy is 67.2kJ, is greater than the standard of the definite 30kJ of Conrad, the problem that low resistance grounding mode exists stator core forever to burn in other words.For the resonance grounding mode; in order to protect generator, every generator all need to connect the resonance grounding device at neutral point, when generator generation single phase ground fault need to hightail electrical network; the delay of having adjusted of resonance grounding device, now can't meet the generator protection requirement.When several parallel running of generators, need between earthing device to intercom mutually simultaneously, and a set of complex parameters setting method will be arranged, this earthing device is expensive complicated, and reliability is low.
Existing most of boats and ships are by Hair Fixer motor power supply in separate unit or two, but the application scenario for many middle Hair Fixer motor power supplies of needs, electric power system operating mode complexity, the situation of off-the-line operation in parallel can frequently appear according to the variation of operating mode in many generators, and cable and hull plate near distance, load is many, the system direct-to-ground capacitance is large, when excessive distributed capacitance can make earth fault occurs, zero-sequence current rises, adopt existing High Resistance Grounding Mode, when earth fault occurs, zero-sequence current does not allow to surpass 10A, therefore the high resistance grounding device can not be applied under large system distributed capacitance condition.Simultaneously; the high resistance grounding device must be connected in generator neutral point, and when many parallel operation of generators, equivalent grounding resistance descends; also can cause current in the fault point to rise, therefore the high resistance grounding device of existing fixed resistance value can not form good protection to many generators.In sum, need a kind of method and apparatus that solves ship intermediate voltage power system earth fault protection problem badly.
Summary of the invention
The objective of the invention is in order to overcome above-mentioned defect and deficiency, a kind of guard method of multiple generator ship intermediate voltage power system and device of can be when stator winding generation single phase ground fault, boats and ships generation earth fault generator and system being protected is provided.
For achieving the above object; the multiple generator ship intermediate voltage power system guard method of the present invention's design is: on the busbar of ship intermediate voltage power system, connect grounding transformer; grounding transformer connects the resonance grounding device; every generator neutral point in ship intermediate voltage power system connects the high resistance grounding device; the resistance value of high resistance grounding device is adjusted by many taps mode, the resistance value R of described high resistance grounding device
gsetting method is:
The generator quantity of setting access is m, and the single-phase direct-to-ground capacitance of the generator that the high resistance grounding device is protected is C
g, the single-phase distributed capacitance of electric power system is C
0, the generator rated voltage is U, resonance grounding device off resonance degree is υ,
When many parallel running of generators of ship intermediate voltage power system, the resistance value R of high resistance grounding device
gvalue is:
In ship intermediate voltage power system, there is generator to break down while needing off-the-line, the resistance value R of high resistance grounding device
gvalue is:
In technique scheme, the off resonance degree υ of described resonance grounding device coordinates the high resistance grounding device to adjust, and the resonance grounding device adopts the overcompensation mode, and the off resonance degree for just, is adjusted by following formula:
The present invention also provides a kind of multiple generator ship intermediate voltage power system protective device simultaneously; comprise the grounding transformer on the busbar that is connected to ship intermediate voltage power system; and be connected to the high resistance grounding device be connected between resonance grounding device between grounding transformer and the earth, every generator neutral point and the earth; described high resistance grounding device is tapped variable resistor, the resistance value R of described high resistance grounding device
gsetting method is:
The generator quantity of setting access is m, and the single-phase direct-to-ground capacitance of the generator that the high resistance grounding device is protected is C
g, the single-phase distributed capacitance of electric power system is C
0, the generator rated voltage is U, resonance grounding device off resonance degree is υ,
When many parallel running of generators of ship intermediate voltage power system, the resistance value R of high resistance grounding device
gvalue is:
In ship intermediate voltage power system, there is generator to break down while needing off-the-line, the resistance value R of high resistance grounding device
gvalue is:
The off resonance degree υ of the resonance grounding device of technique scheme need coordinate the high resistance grounding device to adjust, and the resonance grounding device adopts the overcompensation mode, and the off resonance degree for just, is adjusted by following formula:
Distributed capacitance in this specification refers to: by the morphogenetic a kind of distributed constant of noncapacitive.Generally refer to online and line or line electric capacity between the earth in electric power system.The capacity of this electric capacity is usually very little, but may surpass 100uF in actual multiple generator Ship Electrical Power System, has affected greatly system performance; Grounding transformer refers to: a kind of system of receiving without neutral point, this system is provided to the three-phase transformer of an artificial neutral point, also can be by way of parenthesis to the auxiliary mains supply of part; The resonance grounding device refers to: the system of the equipment ground of the one or more neutral points of neutral point resonant earthed system by having induction reactance.These equipment capacitive effect of compensated line substantially when single-phase shorted to earth.The effect that neutral point connects the high resistance grounding device is, when the earth-free operation of neutral point of electric network, even the capacitance current of system is little, also can be because of producing intermittent arc overvoltage when the single-phase earthing, make the current potential that perfects phase may be elevated to the degree that is enough to destroy its insulation level, even form phase fault.The electromagnetic energy in intermittent arc overvoltage if release after the neutral point (or use grounding transformer and draw neutral point) of transformer is connected in series a resistor; the neutral point current potential reduces; the fault phase recovery voltage rate of climb also slows down; thereby reduce the possibility of arc reignition; suppressed the amplitude of power network overvoltage, and selectively ground protection is achieved.
By arc suppression coil, the earthing device in parallel with high resistance split in the present invention, and the high resistance grounding device is connected to generator neutral point.When stator winding generation single phase ground fault, after generator outlet end circuit breaker disconnects, the high resistance grounding device can over-voltage suppression, fault restriction point electric current simultaneously.And, because the system direct-to-ground capacitance is excessive, adopt resonance grounding mode protection system, building-out capacitor electric current.The high resistance of generator neutral point connection simultaneously also can be adjusted voluntarily by many taps mode, to adapt to the changeable operating mode of boats and ships.Grounding scheme provided by the invention not only has higher power supply continuity when earth fault occurs, and can be applied to excessive direct-to-ground capacitance situation.
Advantage of the present invention is:
(1) the present invention by the mode that the high resistance grounding device is in parallel with the resonance grounding device effectively centering Hair Fixer motor and electric power system protection is provided, this mixing ground connection can effectively be applied at complex working conditions such as multiple generator off-the-lines in parallel simultaneously.
(2) the present invention, by the high resistance grounding device of the resistance of can adjusting, can provide the grounding resistance adapted according to the variation of parallel generator quantity, and making can be by good protection in the frequent off-the-line situation in parallel of generator.
(3) the present invention suppresses by the resonance grounding device of access electrical network the excessive earth fault current that distributed capacitance causes, for the high resistance grounding device can provide protection that condition is provided to generator.
(4) the relative prior art scheme of the present invention, cost is low, adjusts simple, is easy to realize.
The accompanying drawing explanation
Fig. 1 is circuit structure diagram of the present invention;
In Fig. 1, A, B, C are Hair Fixer motors in A, B, C three-phase alternating current, and R is the high resistance grounding device, C
0be system branch electric capacity, L is the resonance grounding device, and T is grounding transformer;
The schematic diagram that Fig. 2 is apparatus of the present invention structure;
Fig. 3 is not for adopting the intermittent defect phase voltage waveform of the inventive method;
Fig. 4 is for adopting the intermittent defect phase voltage waveform figure of the inventive method.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
As shown in FIG.; the guard method of multiple generator ship intermediate voltage power system is to connect grounding transformer on the busbar of ship intermediate voltage power system; grounding transformer connects the resonance grounding device; every generator neutral point in ship intermediate voltage power system connects the high resistance grounding device; resistance in the high resistance grounding device is adjusted by many taps mode, to adapt to the changeable operating mode of boats and ships.
Resistance in the high resistance grounding device is adjusted and the single-phase direct-to-ground capacitance C of generator that accesses generator quantity m and earth resistance and protect
git is relevant,
Resistance value R when many parallel operation of generators normally move
gsetting method as the formula (1).
Wherein, C
0for the single-phase distributed capacitance of electric power system, U is the generator rated voltage, and υ is resonance grounding device off resonance degree, ω=2 π f, f=50Hz.
When generator breaks down while needing off-the-line, high resistance grounding device resistance value should be adjusted rapidly, and setting method as the formula (2)
The off resonance degree υ of resonance grounding device need coordinate the high resistance grounding device to adjust.Generally the resonance grounding device adopts the overcompensation mode, and the off resonance degree is for just.During due to high resistance grounding matching requirements fault, current in the fault point is less than 10A, so off resonance degree υ can be determined by formula (3)
From the resonance grounding device, application is different separately, and when the resonance grounding device is applied separately, υ is generally 10%.And the existence due to High Resistance Grounding Mode can reduce neutral point displacement voltage in mixing earthing mode, so υ can be controlled in 5%, reduces fault current.
Multiple generator ship intermediate voltage power system protective device comprises the grounding transformer on the busbar that is connected to ship intermediate voltage power system; and being connected to the high resistance grounding device be connected between resonance grounding device between grounding transformer and the earth, every generator neutral point and the earth, the high resistance grounding device is tapped variable resistor.
The high resistance grounding device is connected to generator neutral point, and when generator unit stator winding generation single phase ground fault, after generator outlet end circuit breaker disconnects, the high resistance grounding device can over-voltage suppression, fault restriction point electric current simultaneously after adjusting.Adopt resonance grounding mode protection system, the resonance grounding device is passed through to the grounding transformer connecting system, can the building-out capacitor electric current.Make the high resistance grounding device apply under large distributed capacitance condition simultaneously.
The Ship Electrical Power System that the generator outlet end line voltage of take is 6.6kV as example by hybrid earthing mode programming simulation in the PSCAD-EMTDC environment, mix the earthing mode schematic diagram as shown in Figure 1, in Fig. 1, R is earth resistance, and L is arc suppression coil, and T is grounding transformer.Carry out earth fault emulation, the simulation intermittent arc-earth fault.During isolated neutral system generation intermittent arc-earth fault, as shown in Figure 3, while mixing earthing mode generation intermittent arc-earth fault, the system phase voltage waveform as shown in Figure 4 for the system phase voltage waveform.The isolated neutral system overvoltage is obvious as can be seen from Figure 2, and its ceiling voltage has reached 16kV, surpasses 3.5 times of rated voltage peak values, and this overvoltage enough causes the system insulation fault.Can, by Overvoltage suppressing in 2.5 times of rated voltage peak values, effectively protect system insulation and mix earthing device shown in Fig. 4.Can prove by emulation, mix under earthing mode the overvoltage protection shipboard power system trouble free service in the time of can effectively suppressing intermittent arc-earth fault in shipboard power system.
Specific works principle of the present invention is as follows:
When electrical network works, control device is measured neutral point displacement voltage and system distributed capacitance in real time, when timing or measurement change, regulates arc suppression coil electric network capacitance and current is compensated, and generally adopts the overcompensation mode.While occurring single phase ground fault and electrical network residual voltage over setting value, control device is regulated arc suppression coil to compensating coefficient according to pre-set off resonance degree.
The existence of high resistance grounding device can be eliminated the illusory grounding phenomenon that the arc suppression coil inductance that may exist and power-to-ground capacitance series resonance cause.And, when single phase ground fault occurs, high resistance can provide current path, is conducive to failure line selection.
Because the situation of parallel operation of generator and off-the-line often occurs Ship Electrical Power System; electric network composition is along with larger variation can occur the difference of operating mode; need to guarantee to drop into a resonance grounding device and come protection system to avoid superpotential infringement in each electric isolated island, avoid many earthing device conflict to occur simultaneously on system capacitance measurement and parameter tuning.
Every generator neutrality all requires to connect a high resistance grounding device; the overall performance of the resonance grounding that this earth resistance can improve; if generator generation single phase ground fault; after generator contactor disconnects before the rotor demagnetization during this period of time; the high resistance grounding device resistance value of adjusting rapidly, and generator is protected.
Claims (4)
1. multiple generator ship intermediate voltage power system guard method; it is characterized in that: on the busbar of ship intermediate voltage power system, connect grounding transformer; grounding transformer connects the resonance grounding device; every generator neutral point in ship intermediate voltage power system connects the high resistance grounding device; the resistance value of high resistance grounding device is adjusted by many taps mode, the resistance value R of described high resistance grounding device
gsetting method is:
The generator quantity of setting access is m, and the single-phase direct-to-ground capacitance of the generator that the high resistance grounding device is protected is C
g, the single-phase distributed capacitance of electric power system is C
0, the generator rated voltage is U, resonance grounding device off resonance degree is υ,
When many parallel running of generators of ship intermediate voltage power system, the resistance value R of high resistance grounding device
gvalue is:
, wherein, ω=2 π f, f=50Hz;
In ship intermediate voltage power system, there is generator to break down while needing off-the-line, the resistance value R of high resistance grounding device
gvalue is:
2. multiple generator ship intermediate voltage power system according to claim 1 guard method; it is characterized in that: the off resonance degree υ of described resonance grounding device coordinates the high resistance grounding device to adjust; the resonance grounding device adopts the overcompensation mode, and the off resonance degree for just, is adjusted by following formula:
3. a multiple generator ship intermediate voltage power system protective device; it is characterized in that: comprise the grounding transformer on the busbar that is connected to ship intermediate voltage power system; and be connected to the high resistance grounding device be connected between resonance grounding device between grounding transformer and the earth, every generator neutral point and the earth; described high resistance grounding device is tapped variable resistor, the resistance value R of described high resistance grounding device
gsetting method is:
The generator quantity of setting access is m, and the single-phase direct-to-ground capacitance of the generator that the high resistance grounding device is protected is C
g, the single-phase distributed capacitance of electric power system is C
0, the generator rated voltage is U, resonance grounding device off resonance degree is υ,
When many parallel running of generators of ship intermediate voltage power system, the resistance value R of high resistance grounding device
gvalue is:
In ship intermediate voltage power system, there is generator to break down while needing off-the-line, the resistance value R of high resistance grounding device
gvalue is:
4. multiple generator ship intermediate voltage power system protective device according to claim 3; it is characterized in that: the off resonance degree υ of described resonance grounding device coordinates the high resistance grounding device to adjust; the resonance grounding device adopts the overcompensation mode, and the off resonance degree for just, is adjusted by following formula:
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| CN201310423013.5A CN103490384B (en) | 2013-09-17 | 2013-09-17 | Multi-generator ship intermediate voltage electric power system protection method and device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923374A (en) * | 2018-08-01 | 2018-11-30 | 国电南瑞科技股份有限公司 | A kind of method of large-scale generator neutral grounded transformer type selecting |
| RU2758465C1 (en) * | 2021-05-19 | 2021-10-28 | Федеральное государственное бюджетное образовательное учреждение высшего образования «Государственный университет морского и речного флота имени адмирала С.О. Макарова» | Device for preventive control of ship's electric power system |
| RU2784000C1 (en) * | 2022-10-13 | 2022-11-23 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Государственный университет морского и речного флота имени адмирала С.О. Макарова" | Apparatus for preventive control of the electric power system of a ship |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923374A (en) * | 2018-08-01 | 2018-11-30 | 国电南瑞科技股份有限公司 | A kind of method of large-scale generator neutral grounded transformer type selecting |
| CN108923374B (en) * | 2018-08-01 | 2019-08-23 | 国电南瑞科技股份有限公司 | A kind of method of large-scale generator neutral grounded transformer type selecting |
| RU2758465C1 (en) * | 2021-05-19 | 2021-10-28 | Федеральное государственное бюджетное образовательное учреждение высшего образования «Государственный университет морского и речного флота имени адмирала С.О. Макарова» | Device for preventive control of ship's electric power system |
| RU2784000C1 (en) * | 2022-10-13 | 2022-11-23 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Государственный университет морского и речного флота имени адмирала С.О. Макарова" | Apparatus for preventive control of the electric power system of a ship |
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| CN103490384B (en) | 2015-04-22 |
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