CN204012678U - A kind of power distribution network multimode ground protection system - Google Patents
A kind of power distribution network multimode ground protection system Download PDFInfo
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- CN204012678U CN204012678U CN201420363400.4U CN201420363400U CN204012678U CN 204012678 U CN204012678 U CN 204012678U CN 201420363400 U CN201420363400 U CN 201420363400U CN 204012678 U CN204012678 U CN 204012678U
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Abstract
The utility model discloses a kind of power distribution network multimode ground protection system, comprise grounding transformer, metal oxide arrester, small resistor, arc suppression coil, controller and multiple zero sequence current mutual inductor; Grounding transformer one side is connected respectively with power distribution network three-phase bus, the high pressure winding neutral point that opposite side is grounding transformer, and high pressure winding neutral point is connected with arc suppression coil; Arc suppression coil comprises inductance adjustment circuitry, is connected with controller by inductance adjustment circuitry; Metal oxide arrester one end ground connection, the other end connects the high pressure winding neutral point of grounding transformer; Small resistor is in series with high voltage connector, is connected with high pressure winding neutral point by high voltage connector; One side of each zero sequence current mutual inductor is connected respectively with power distribution network three-phase bus, and opposite side is connected with controller.The power distribution network multimode ground protection system that the utility model provides has advantages of that earth fault is processed flexibly, power supply reliability is high.
Description
Technical field
The utility model relates to technical field of power systems, relates in particular to a kind of power distribution network multimode ground protection system.
Background technology
The selection of neutral grounding in distribution power network and power system security and operational reliability, economy are closely related, are the problems that must pay close attention to during urban and rural power grids are built.The selection of earthing mode should be considered structure and the equipment of power distribution network at that time, is also subject to the restriction of grounding apparatus technical merit.
Power distribution network grounding system is the treatment system when tackling power distribution network generation earth fault, to ensure the normal power supply to people.In power distribution network grounding system, there is neutral point.And isolated neutral mode refers to that neutral point is not artificially connected with the earth.In fact, such power distribution network is by power-to-ground capacitance ground connection.
In the time of the earth-free system generation of neutral point single phase ground fault, the power supply of bearing the electric equipment of line voltage is not destroyed, and they can continue operation.But this electrical network moves under the state in single-phase earthing for a long time, be also unallowable.Because at this moment healthy phases voltage raises, insulation weak spot is probably breakdown, thereby causes two phase ground short circuit, will seriously damage electric equipment.So, in isolated neutral electrical network, must establish special monitoring arrangement, so that operations staff finds single phase ground fault in time, thus the faulty component in excision electrical network.
In isolated neutral system, in the time that the capacitance current of ground connection is larger, the electric arc causing ground connection locating is just difficult to from horizontal blanking.Ground connection, place also may occur extinguishing so-called indirect arc periodically and the electric arc of restriking.Because electrical network is an oscillation circuit with inductance and electric capacity, indirect arc is by the overvoltage causing relatively, and its numerical value can reach 2.5-3.5 times of phase voltage.This overvoltage can be transferred to earth point to be had on direct-connected whole electrical network, more easily causes that another relatively punctures, and forms two phase ground short circuit.
Prior art has introduced arc suppression coil or low resistance grounding scheme is protected power distribution network.Wherein, neutral by arc extinction coil grounding mode refers to that the one or more neutral points of power distribution network are connected with the earth through arc suppression coil, and the stable state power frequency inductance current of arc suppression coil is tuning to Power System Steady-state power frequency capacity current, therefore also claim resonance grounding.Neutral Point Through Low Resistance mode refers in power distribution network, to have a neutral point connecting resistance at least.Two kinds of patterns of grounding through arc and low resistance grounding respectively have pluses and minuses, wherein: grounding through arc mode can reduce earth current, lower the probability that arc light overpressure situation occurs, but shortcoming is ground connection overlong time, system power frequency overpressure situation long-term existence, is difficult to isolated fault circuit; Low resistance grounding mode is by producing large current signal, and energy is tripping faulty line accurately, but it is to instantaneity earth fault and permanent earth fault consistently practise tripping operation, and trip-out rate is high, has reduced system power supply reliability.
Summary of the invention
Technical problem to be solved in the utility model is, a kind of power distribution network multimode ground protection system is provided, in conjunction with the advantage of grounding through arc mode and low resistance grounding mode, and isolated fault circuit effectively, and improve the power supply reliability of power distribution network.
For solving above technical problem, the utility model embodiment provides a kind of power distribution network multimode ground protection system, comprises grounding transformer, metal oxide arrester, small resistor, arc suppression coil, controller and multiple zero sequence current mutual inductor;
Described grounding transformer one side is connected respectively with power distribution network three-phase bus, the high pressure winding neutral point that opposite side is described grounding transformer, and described high pressure winding neutral point is connected with described arc suppression coil;
Described arc suppression coil comprises inductance adjustment circuitry, is connected with described controller by described inductance adjustment circuitry;
Described metal oxide arrester one end ground connection, the other end connects the high pressure winding neutral point of described grounding transformer;
Described small resistor is in series with high voltage connector, is connected with described high pressure winding neutral point by described high voltage connector;
Described in each, a side of zero sequence current mutual inductor is connected respectively with power distribution network three-phase bus, and opposite side is connected with described controller.
Further, described power distribution network multimode ground protection system, also comprises: arc suppression coil parallel resistance earthing device;
Described arc suppression coil parallel resistance earthing device one end ground connection, the other end is connected with power distribution network three-phase bus, described small resistor and described high pressure winding neutral point.
Further, described controller comprises high-power silicon controlled rectifier and filter.
Preferably, described controller is feeder terminal unit.
Further, described feeder terminal unit comprises waterproof lightning protection shell and single-chip microcomputer, and described single-chip microcomputer is built in described waterproof lightning protection shell.
Again further, described feeder terminal unit also comprises data acquisition unit and multiple fault detector.
Again further, described power distribution network multimode ground protection system also comprises a fan.
Preferably, described arc suppression coil is turn-adjusting arc-extinguishing winding or high short-circuit impedance arc suppression coil.
A kind of power distribution network multimode ground protection system that the utility model embodiment provides, by grounding transformer, power distribution network three-phase bus is connected to small resistor or arc suppression coil, and by controller, small resistor or arc suppression coil are carried out to gating, thereby can be according to the type of current earth fault, select different earthing modes to realize the protection to power distribution network three-phase bus, can pass through the accurate tripping faulty line of small resistor, permanent earth fault is carried out to tripping operation, protect distribution network line; Can supplement instantaneity earth fault by arc suppression coil, avoid switch trip repeatedly, ensure power supply Stability and dependability.
Brief description of the drawings
Fig. 1 is the structural representation of the power distribution network multimode ground protection system that provides of the utility model embodiment mono-;
Fig. 2 is the structural representation of the power distribution network multimode ground protection system that provides of the utility model embodiment mono-in the time of single-phase earthing;
Fig. 3 is the arc suppression coil that provides of the utility model embodiment bis-and the syndeton schematic diagram of controller;
Fig. 4 is circuit theory diagrams and the equivalent circuit diagram thereof of the high short-circuit impedance transformer that provides of the utility model embodiment bis-.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described.
Embodiment mono-
Referring to Fig. 1, it is the structural representation of the power distribution network multimode ground protection system that provides of the utility model embodiment mono-.
In the present embodiment, described power distribution network multimode ground protection system comprises:
Grounding transformer T, metal oxide arrester MOA, small resistor Rb, arc suppression coil L, controller (not drawing in Fig. 1) and multiple zero sequence current mutual inductor (Current Transformer, be called for short CT), be respectively zero-sequence current CT1, zero-sequence current CT2, zero-sequence current CTn, wherein n is positive integer.While there is electric shock or leak current fault in each zero sequence current mutual inductor in circuit; zero sequence current mutual inductor secondary side produces zero sequence earth current; be used in conjunction with described small resistor Rb or arc suppression coil L; make equipment on connect secondary line carry out protection action (as cut off the electricity supply, report to the police etc.).
Described grounding transformer T mono-side is connected respectively with power distribution network three-phase bus A, B, C, the high pressure winding neutral point (not drawing in Fig. 1) that opposite side is described grounding transformer, and described high pressure winding neutral point is connected with described arc suppression coil L.
Described arc suppression coil L comprises inductance adjustment circuitry, is connected with described controller by described inductance adjustment circuitry.Controller calculates the inductive current that needs compensation according to the capacitance current of distribution network value of having measured, then control arc suppression coil L output offset current.After general instantaneity earth fault is compensated by inductive current, arc extinction earth fault is eliminated recovery normal condition automatically, thereby has avoided occurring in low resistance grounding mode that one has fault to trip at once to make the situation that line tripping rate is high.
Described metal oxide arrester MOA (Metal Oxide Arrester, metal oxide arrester) one end ground connection, the other end connects the high pressure winding neutral point of described grounding transformer T.Metal oxide arrester MOA is made up of metal oxide valve block, and its protective value is better than common valve type arrester and magnetic blowout arrester.
Described small resistor Rb is in series with high voltage connector KG, is connected with described high pressure winding neutral point by described high voltage connector KG; Small resistor Rb is connected to controller by high voltage connector KG.Among a kind of implementation, high voltage connector KG is made up of two vacuum contactor parallel connections.In the time that distribution net work earthing fault is permanent fault, it is closure state that described controller adopts alternating current-direct current two-way power supply to control respectively two described vacuum contactors, and described small resistor Rb is accessed to described grounding transformer T; And in the time that described permanent fault is eliminated, two vacuum contactors described in described controller control are off-state, cut off the isolation of described small resistor Rb to earth fault.Vacuum contact utensil arc-rupturing capacity is strong, good pressure-resistant performance, the series of advantages such as frequency of operation is higher, and the life-span is long, sprays outward without electric arc, and volume is little, lightweight, maintenance cycle is long.
Described in each, a side of zero sequence current mutual inductor is connected respectively with power distribution network three-phase bus A, B, C, and opposite side is connected with described controller.For 10kV power distribution network, power distribution network power supply main transformer winding mainly adopts Δ connection (triangle connection) or Y wiring, and grounding transformer T produces neutral point.Particularly, the point that the absolute value of voltage in the winding of grounding transformer T and between outside each terminals equates is neutral point.For reducing zero sequence impedance, grounding transformer T preferably adopts Z-shaped wiring, is directly connected to power supply main transformer exit, and as required can be with suitable secondary capacity.
Referring to Fig. 2, be the structural representation of the power distribution network multimode ground protection system that provides of the utility model embodiment mono-in the time of single-phase earthing.
In one-phase ground protection system, grounding transformer 201 is connected with power distribution network bus by isolating switch 206, and in the time that grounding transformer 201 is connected with power distribution network three-phase bus A, B, C, isolating switch 206 should be three-phase isolation switch.Grounding transformer 201 is connected with arc suppression coil 202, vacuum contactor 103 by isolation switch 207, and the place that the absolute value of voltage in grounding transformer 201 windings and between outside each terminals equates produces neutral point PT.Generation current instrument transformer 1CT between arc suppression coil 202 and the earth, generation current instrument transformer 2CT between small resistor 204 and the earth.Controller 205 is connected respectively with arc suppression coil 202, small resistor 204, to realize Based Intelligent Control and the switching to both.In the time that current earth fault is instantaneity earth fault, controller 205 is controlled arc suppression coil 202 and is carried out the compensation to power distribution network three-phase bus, until fault disappears; In the time that current earth fault is permanent earth fault, controller 205 is controlled input small resistor 204 faulty line is cut off.
When concrete enforcement, the power distribution network multimode ground protection system that the present embodiment provides also comprises: arc suppression coil parallel resistance earthing device.Described arc suppression coil L parallel resistance earthing device one end ground connection, the other end and power distribution network three-phase bus A, B, C, described small resistor and described high pressure winding neutral point connect.Described power distribution network multimode ground protection system also comprises a fan.
Embodiment bis-
The distinctive points of the present embodiment and embodiment mono-is: further, the small resistor in the present embodiment preferably adopts high-power fire-resistant oxidation resistant resistance.
Described high-power fire-resistant oxidation resistant resistance is preferably stainless steel alloy resistance, and described stainless steel alloy resistance adopts grid type structure by multiple resistor discs, or described powerful fire-resistant oxidation resistant resistance adopts Modular Structure Design to form.
Further, controller comprises high-power silicon controlled rectifier (Silicon Controlled Rectifier is called for short SCR) and filter.
Referring to Fig. 3, be the arc suppression coil that provides of the utility model embodiment bis-and the syndeton schematic diagram of controller.
Wherein, the current i PT of the neutral point PT access that the winding A-X of arc suppression coil and grounding transformer produce, arc suppression coil, except comprising the winding A-X that connects power network neutral point PT, also comprises winding O1-X1 and secondary winding O2-X2; Controller comprises choke L1 and capacitor C1, choke L2 and capacitor C2, wherein, and choke L1 and capacitor C1 composition series circuit, choke L2 and capacitor C2 composition series circuit, above two series circuits are connected in parallel on the two ends of a winding O1-X1; Controllable silicon SCR rectifier cell is connected to the two ends of secondary winding O2-X2.Described secondary winding O2-X2 is the circuit being made up of the silicon controlled rectifier of two reverse parallel connections, and is connected with controller as controlling winding (Control Winding, CW).
Preferably, the arc suppression coil in the present embodiment is turn-adjusting arc-extinguishing winding or high short-circuit impedance arc suppression coil.Wherein, high short-circuit impedance arc suppression coil is also referred to as high short-circuit impedance transformer.In preferred implementation, described high short-circuit impedance transformer is arranged in the on-site control that adopts compact integrated cabinet design; Small resistor also can be used as the linear quadratic control device of controlled reactor and is arranged on cabinet, avoided the cable line of long distance to lay, and simplified product structure and also improved reliability and the antijamming capability of product simultaneously.
In high short-circuit impedance pressure swing type Controllable Arc-Suppression Coil System, can comprise controlled reactor, controller can be controlled in real time to this controlled reactor, can realize arc suppression coil adjustable continuously.This Controllable Arc-Suppression Coil System have adjustable range greatly, exit rapidly at any time, without advantages such as damping resistances.
Referring to Fig. 4, be circuit theory diagrams and the equivalent circuit diagram thereof of the high short-circuit impedance transformer that provides of the utility model embodiment bis-.Wherein, Fig. 4 (a) is the secondary winding O2-X2 of high short-circuit impedance transformer and the connecting circuit figure of controllable silicon SCR, and Fig. 4 (b) is the equivalent circuit diagram of high short-circuit impedance transformer.
Particularly, arc suppression coil A-X and secondary winding O2-X2 are equivalent to inductive impedance Z
sC, controllable silicon SCR rectifier cell is equivalent to the adjustable resistance Z of resistance between 0～+ ∞
sCR.Change between 0 to 180 degree by the angle of flow that regulates controllable silicon SRC, make the equiva lent impedance Z of controllable silicon SRC
sCRbetween infinity to zero, change the equiva lent impedance Z at Working winding two ends (A-X two ends)
eqthe just short-circuit impedance Z to transformer in infinity
sCbetween change, the offset current of output just can be zero to obtaining continuous stepless adjusting between rated value.
Wherein, in each single-phase earthing treatment system of the multimode ground protection system that the present embodiment provides; the principle of power distribution network being followed the tracks of to compensation by arc suppression coil is: the direct-to-ground capacitance voltage transformation of system real-time tracking power distribution network; in the time that arc suppression coil detects that grounding transformer neutral point voltage has the variation of Δ U (Δ U<1V), system is measured power distribution network capacitance to earth at that time within the short time (as 1 second).After measurement completes, system can be passed through screen display capacitance current, represents that earth point is by the capacitance current flowing through in the time there is Single Phase Metal ground connection.
Measure based on power distribution network zero sequence loop, utilize the neutral point current of change inductance front and back, the vector of neutral point voltage to change, its computing formula is as follows:
Wherein,
with
be respectively two groups of neutral point current in different induction situation and the vector value of neutral point voltage.
Adopt high short-circuit impedance pressure swing type Controllable Arc-Suppression Coil System to process and there is following uniqueness 10kV electric network fault:
One, because adopting short-circuit impedance instead of excitation impedance as working impedance, thereby arc suppression coil 102 voltage-current characteristics can ensure to keep the splendid linearity in the 0-110% range of nominal tension;
Its two, because adopting SCR control, thereby arc suppression coil 102 response speeds are exceedingly fast, and output current can regulate by continuous stepless between 0-100% rated current; Adopt with mode control, while normally operation, electrical network is away from resonance point, without the damping resistance easily having problems;
Its three, compared with traditional arc suppression coil etc., the arc suppression coil 102 that the present embodiment provides simple in structure, noise is little, is not with any rotation or transmission mechanism, without loaded switch and contactor.
Embodiment tri-
The distinctive points of the present embodiment and embodiment bis-is: described controller is feeder terminal unit (FeederTerminal Unit is called for short FTU).Feeder terminal unit can be arranged on outdoor or indoor.Intelligent terminal FTU completes remote measurement, remote control, the remote signalling to Distribution Network Equipment, and fault detection capability, and with power distribution automation master station communication, it is Monitoring and Controlling information needed that distribution system ruuning situation and various parameter are provided,
In power distribution network, FTU volume is little, quantity is many, can be placed on outdoor feeder line, is provided with transmitter, directly AC sampling, and high temperature resistance, cold-resistant, adapt to outdoor rugged environment; The data volume that FTU gathers is little, and required communication rate is lower, and reliability requirement is higher.FTU can adopt High Performance SCM manufacture, and in order to adapt to rugged environment, feeder terminal unit should comprise waterproof lightning protection shell, and described single-chip microcomputer is built in described waterproof lightning protection shell.
Further, described feeder terminal unit also comprises data acquisition unit and multiple fault detector, so that extract power distribution network related data, and in the time there is electric network fault, send relevant instruction.
When concrete enforcement; originally be that the multimode ground protection system that embodiment provides can further arrange a centralized monitor management system; for the wiring situation of power distribution network three-phase bus looped network is carried out to Real-Time Monitoring; the real-time status of display device group switch; equipment is carried out electric detection and the operating data of electrical network intelligent apparatus is uploaded and local data statistical analysis, to arc suppression coil monitoring and Mediation Device group's the response processing etc. arranged side by side between station.
In the present embodiment, in the time of the judgement that small resistor is dropped into, to dropping into the tripping operation time delay of small resistor delay time original program.If when ground connection in ground connection process arrives the time delay of small resistor input time of delay, close controllable silicon and stop arc suppression coil compensation, and control closed high contactor and drop into small resistor.Send at controller after the order that drops into small resistor, the auxiliary node of two high voltage connectors of monitoring, as still do not receive that auxiliary node displacement is judged as high voltage connector fault after sending input order 1s; In like manner, do not receive that auxiliary node displacement also can be judged as high voltage connector fault sending after point small resistor order.Drop into after small resistor, follow the tracks of the variation of the voltage magnitude of described grounded neutral, when double when monitoring described grounded neutral voltage and being less than set point, described controller judges that described low resistance grounding finishes, and control high voltage connector and trip to exit described small resistor, return to normal operating condition.
In the present embodiment, in any case, the duration of arc suppression coil single compensation does not allow to exceed extinguishing arc time rating (being preferably 20 seconds).After overtime, close the output of arc suppression coil, proceed to high impedance status.Exceed time rating (no matter which kind of reason causes such as small resistor trips unsuccessfully, and there is no tripping ground connection change etc.) when the single ground connection duration, the compensation behavior of arc suppression coil is adjusted into immediately closes output, proceeds to high impedance status.If certain hour (as 3 minutes) if in occur repeatedly and above earth fault, for example 3 times be cooling time after ground connection for the third time, the ground connection in cooling time, uncompensation without exception, directly drops into small resistor and trips.
For example, be set to 0 minute cooling time (small resistor exit time delay be also set to 0 words), the situation that a ground connection occurs never and just throw resistance, needs to drop into resistance after time delay forever simultaneously.Be set to 1 minute, ground connection occurred in one minute and throw at once resistance.If there is not ground connection in one minute, to lose efficacy this cooling time, action reverts to " ground connection---compensation---delay tripping " logic.Having again ground connection occurred 3 times in ' three minutes ' this situation occurs, and just understands reclocking cooling time.When small resistor drops into when unsuccessful, any ground connection duration, as exceeded the default reactance time, is outputed the node of high voltage connector.After small resistor drops into, when ground connection is not finished, after high voltage connector return node shows that resistance drops into successfully, timing starts, and arrives after " resistance time rating ", forces disjunction small resistor (switch must select circuit breaker just effectively).By increasing the statistical function to all records, count instantaneity ground connection and the ratio that needs the ground connection of dropping into small resistor tripping operation.
A kind of power distribution network multimode ground protection system that the utility model embodiment provides, by small resistor and arc suppression coil are connected with power distribution network three-phase bus respectively, and intelligentized design to controller, effectively identify different distribution net work earthing fault types, can call arc suppression coil the power distribution network that instantaneity earth fault occurs is carried out to current compensation; Design high voltage connector drops into small resistor the circuit that permanent earth fault occurs is cut off.Controller also can be carved in due course control high voltage connector and trip to exit described small resistor or arc suppression coil, returns to normal operating condition.Therefore, the utility model can, for different systems and different earthing types, can be avoided because of transient fault Frequent trip, ensures continuity and the reliability of power supply, can ensure again to disconnect in time continuous earth faulty line, thereby realize the earth fault that effectively solves power distribution network.
The above is preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications are also considered as protection range of the present utility model.
Claims (8)
1. a power distribution network multimode ground protection system, is characterized in that, comprises grounding transformer, metal oxide arrester, small resistor, arc suppression coil, controller and multiple zero sequence current mutual inductor;
Described grounding transformer one side is connected respectively with power distribution network three-phase bus, the high pressure winding neutral point that opposite side is described grounding transformer, and described high pressure winding neutral point is connected with described arc suppression coil;
Described arc suppression coil comprises inductance adjustment circuitry, is connected with described controller by described inductance adjustment circuitry;
Described metal oxide arrester one end ground connection, the other end connects the high pressure winding neutral point of described grounding transformer;
Described small resistor is in series with high voltage connector, is connected with described high pressure winding neutral point by described high voltage connector;
Described in each, a side of zero sequence current mutual inductor is connected respectively with power distribution network three-phase bus, and opposite side is connected with described controller.
2. power distribution network multimode ground protection system as claimed in claim 1, is characterized in that, also comprises: arc suppression coil parallel resistance earthing device;
Described arc suppression coil parallel resistance earthing device one end ground connection, the other end is connected with power distribution network three-phase bus, described small resistor and described high pressure winding neutral point.
3. power distribution network multimode ground protection system as claimed in claim 1, is characterized in that, described controller comprises high-power silicon controlled rectifier and filter.
4. power distribution network multimode ground protection system as claimed in claim 3, is characterized in that, described controller is feeder terminal unit.
5. power distribution network multimode ground protection system as claimed in claim 4, is characterized in that, described feeder terminal unit comprises waterproof lightning protection shell and single-chip microcomputer, and described single-chip microcomputer is built in described waterproof lightning protection shell.
6. power distribution network multimode ground protection system as claimed in claim 5, is characterized in that, described feeder terminal unit also comprises data acquisition unit and multiple fault detector.
7. power distribution network multimode ground protection system as claimed in claim 1, is characterized in that, described power distribution network multimode ground protection system also comprises a fan.
8. the power distribution network multimode ground protection system as described in claim 1～7 any one, is characterized in that, described arc suppression coil is turn-adjusting arc-extinguishing winding or high short-circuit impedance arc suppression coil.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105552875A (en) * | 2016-02-29 | 2016-05-04 | 国家电网公司 | Arc suppression coil device and impulse current suppression method thereof |
| CN105655998A (en) * | 2016-03-31 | 2016-06-08 | 国网天津市电力公司 | Low-voltage side neutral point FACTS (flexible alternating current transmission systems) grounding device of 110kV transformer |
| CN105676071A (en) * | 2016-02-29 | 2016-06-15 | 国家电网公司 | High-resistance control method for fault line selection |
| CN106655120A (en) * | 2016-11-30 | 2017-05-10 | 孙嘉宁 | Intelligent ground protection method and system for neutral point of power distribution network |
| CN107658860A (en) * | 2017-09-01 | 2018-02-02 | 南方电网科学研究院有限责任公司 | Distribution network system failure restraint method and device, computer-readable storage medium and equipment |
| CN107678478A (en) * | 2017-10-24 | 2018-02-09 | 国网山西省电力公司电力科学研究院 | Voltage transformer secondary neutral point valve block Working Status Monitoring circuit and method |
| CN109004531A (en) * | 2018-07-27 | 2018-12-14 | 国网江苏省电力有限公司苏州供电分公司 | A kind of neutral resistance complexes |
| CN109004629A (en) * | 2018-07-27 | 2018-12-14 | 国网江苏省电力有限公司苏州供电分公司 | A kind of ground connection change protection system suitable for low resistance grounding |
| CN114407734A (en) * | 2021-12-21 | 2022-04-29 | 西南交通大学 | Flexible traction power supply system and protection method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105552875A (en) * | 2016-02-29 | 2016-05-04 | 国家电网公司 | Arc suppression coil device and impulse current suppression method thereof |
| CN105676071A (en) * | 2016-02-29 | 2016-06-15 | 国家电网公司 | High-resistance control method for fault line selection |
| CN105655998A (en) * | 2016-03-31 | 2016-06-08 | 国网天津市电力公司 | Low-voltage side neutral point FACTS (flexible alternating current transmission systems) grounding device of 110kV transformer |
| CN106655120A (en) * | 2016-11-30 | 2017-05-10 | 孙嘉宁 | Intelligent ground protection method and system for neutral point of power distribution network |
| CN107658860A (en) * | 2017-09-01 | 2018-02-02 | 南方电网科学研究院有限责任公司 | Distribution network system failure restraint method and device, computer-readable storage medium and equipment |
| CN107678478A (en) * | 2017-10-24 | 2018-02-09 | 国网山西省电力公司电力科学研究院 | Voltage transformer secondary neutral point valve block Working Status Monitoring circuit and method |
| CN109004531A (en) * | 2018-07-27 | 2018-12-14 | 国网江苏省电力有限公司苏州供电分公司 | A kind of neutral resistance complexes |
| CN109004629A (en) * | 2018-07-27 | 2018-12-14 | 国网江苏省电力有限公司苏州供电分公司 | A kind of ground connection change protection system suitable for low resistance grounding |
| CN114407734A (en) * | 2021-12-21 | 2022-04-29 | 西南交通大学 | Flexible traction power supply system and protection method |
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