CN104597899B - Distributing automation apparatus technical performance test platform - Google Patents
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- CN104597899B CN104597899B CN201510057024.5A CN201510057024A CN104597899B CN 104597899 B CN104597899 B CN 104597899B CN 201510057024 A CN201510057024 A CN 201510057024A CN 104597899 B CN104597899 B CN 104597899B
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- 238000011056 performance test Methods 0.000 title claims abstract description 19
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- 230000007935 neutral effect Effects 0.000 claims abstract description 35
- 238000004088 simulation Methods 0.000 claims abstract description 22
- 239000013307 optical fiber Substances 0.000 claims abstract description 4
- 230000005611 electricity Effects 0.000 claims description 6
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- 238000012360 testing method Methods 0.000 abstract description 27
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 9
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
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- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The present invention relates to electric device maintenance field, more particularly to a kind of distributing automation apparatus technical performance test platform with low-voltage equipment simulated high-pressure equipment for power transmission and distribution.Distributing automation apparatus technical performance test platform, including experiment porch, controller and Surveillance center, the experiment porch are connected with controller, and controller is connected by optical fiber with Surveillance center again；The experiment porch includes simulation 10kV distribution lines, simulated high-pressure transformer station supply transformer and the neutral point device of simulation, analog switch equipment, analog voltage transformer and analog current transformer, simulates distribution transformer, analogue ground control unit.The present invention forms experiment porch, controller, Surveillance center the distributing automation apparatus technical performance test platform of complete set, and test platform is provided for overall debugging, the examination of distributing automation apparatus.
Description
Technical field
It is more particularly to a kind of with low-voltage equipment simulated high-pressure equipment for power transmission and distribution the present invention relates to electric device maintenance field
Distributing automation apparatus technical performance test platform.
Background technology
Distribution Automation Technology just popularizes in power system.The distribution automation device of complete set includes automation
Main website (hereinafter referred to as Surveillance center), line sectionalizing switch, terminal (or boundary) switch, interconnection switch, automatization terminal (following letter
Claim controller), power distribution communication, information exchange, and network system.These equipment are scattered to be arranged on each section of distribution network feeder,
Surveillance center is typically remote from scene in control room, and mutually coordinating exactly by regulated procedure could complete entirely to automate
Journey, obstacle, which occurs, in any link can all cause overall failure even fault spread.The integration test of distribution automation device, check and accept
It is indispensable link before putting into operation.
Each equipment mount point in distribution automation device is disperseed, and typically may extend into ten several kilometers, it is allowed to installation in place
Time it is shorter, can only have a power failure half a day or several hours, branch installs in batches after, charging operation immediately.More not in band
The technical performance of distribution automation device is verified as short-circuit test on the high-tension line of electricity, such as each section phase fault, it is single-phase
Ground short circuit, excision, isolation, turn power supply process.The anomalies such as tripping, malfunction occur during operation unavoidably, has a power failure and searches
Often do not allow again, processing defect is very difficult, pays through the nose sometimes.
The acceptance method of the distribution automation device of enterprise's mark Q/GDW567-2010 defineds, it is desirable in analogue simulation platform
The upper simulating, verifying for carrying out power distribution automation Premium Features and Black-box Testing, this method can only examine distribution automation device
Local Property, it is impossible to substitute live Coupled motion experiment, the overall technology index of distribution automation device can not be verified.
The content of the invention
It is an object of the invention to overcome the above-mentioned deficiency of prior art, there is provided a kind of distributing automation apparatus technical performance
Test platform, test platform is provided for overall debugging, the examination of distributing automation apparatus.
To achieve the above object, the invention provides following technical scheme：
Distributing automation apparatus technical performance test platform, including experiment porch, controller and Surveillance center, the experiment
Platform is connected with controller, and controller is connected by optical fiber with Surveillance center again, and the experiment porch includes simulation 10kV distribution
Circuit, simulated high-pressure transformer station supply transformer and the neutral point device of simulation, analog switch equipment, analog voltage transformer and mould
Intend current transformer, simulate distribution transformer, analogue ground control unit；The simulation 10kV distribution lines include 10kV three-phases
Loop, 10kV three-phases loop are switched on and off equipment and are divided into multiple section circuits, and line impedance, and foundation are replaced by inductance or resistance
Capacitance current size in each section circuit, secondary capacitor is configured on each section circuit；The simulated high-pressure transformer station power supply
Transformer includes 0.4kV/0.1kV, Y/d-11 small power transformer, current filter；Simulating neutral point device then includes electricity
Coil is felt, for simulating the slide wire resistance of neutral resistor, and neutral point switch, disconnecting link, neutral point voltage transformer, neutrality
Point current transformer；Current filter is connected by neutral point switch in power transformer outlet, current filter passes through disconnecting link
It is connected with inductance coil and slide wire resistance, the both ends connection neutral point voltage transformer of inductance coil, inductance coil and slip electricity
The tail end of resistance is all connected with neutral point current transformer.
In above-mentioned distributing automation apparatus technical performance test platform, the analog switch equipment includes block switch, end
End switch, interconnection switch, block switch, limit switch, interconnection switch are used to connect each section circuit, the block switch, end
End switch, interconnection switch are 220V A.C. contactors.
In above-mentioned distributing automation apparatus technical performance test platform, the analog voltage transformer is 100V/100V electricity
Transformer is pressed, is respectively provided with first voltage transformer and second voltage transformer in the both sides of each line switching equipment, first
Voltage transformer is connected on A, B phase of circuit, and second voltage transformer is connected on B, C phase of circuit, for protecting and measuring use；It is described
Analog current transformer is zero sequence current mutual inductor, and the block switch, limit switch, the mount point of interconnection switch are equipped with zero
Sequence current transformer, the secondary side of zero sequence current mutual inductor access for controller.
In above-mentioned distributing automation apparatus technical performance test platform, the simulation distribution transformer is D/y0 low capacities
Three-phase transformer, some D/y0 low capacity three-phase transformers are configured on section circuit, to verify 10kV section route protections
To the recognition capability shoved.
In above-mentioned distributing automation apparatus technical performance test platform, the analogue ground control unit includes touchdown time
Controller and the slide wire resistance of series connection with it, the break-make moment of the touchdown time controller control residual voltage, the slip
Resistance controls the amplitude of output voltage.
Compared with prior art, beneficial effects of the present invention：The present invention forms experiment porch, controller, Surveillance center
The distributing automation apparatus technical performance test platform of complete set, experiment porch generate the simulation of power distribution network according to test request
Dynamic data is measured, and is sent analog quantity dynamic data to Surveillance center by communication link, it is complete so as to form one
Test environment, the test environment for solving distributing automation apparatus in the prior art are imperfect so that partial data can not be obtained
Problem, the effect completely tested distributing automation apparatus by the running status of experiment porch, improve power distribution automation
The reliability and security of device.Experiment porch is made up of low voltage component, is simulated with the experiment porch of safe operation, complete function
Various failures in high-voltage operation equipment, solve power distribution automation equipment point polydispersion, it is with a varied topography, live to be joined
Dynamic test, the situation checked and accepted.This invention also solves the analogue simulation platform of prior art can only verifying attachment Local Property,
The defects of overall technology index of device can not be verified, since line short fault, through tripping operation excision, Fault Isolation until negative
Lotus turns to supply to terminate, the complete operation program of verifying attachment, provides test for overall debugging, the examination of distributing automation apparatus and puts down
Platform.
Brief description of the drawings
Fig. 1 is the structure principle chart of electrical power distribution automatization system of the present invention；
Fig. 2 is 10kV distribution line structure charts in experiment porch；
Fig. 3 is the circuit structure diagram that supply transformer and neutral point device are simulated in experiment porch；
Fig. 4 is the link circuit figure of A.C. contactor and controller；
Fig. 5 is the circuit connection diagram of single-phase earthing unit of testing and controlling.
Marked in figure：1- experiment porch, 2- controllers, 3- Surveillance center, 31- power transformers, 32- current filters.
Embodiment
The present invention is further illustrated with reference to the accompanying drawings and detailed description.
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
Embodiment 1
As shown in Figure 1, the distributing automation apparatus technical performance test platform of the present embodiment, including experiment porch 1, control
Device 2 processed and Surveillance center 3, the experiment porch 1 are connected with controller 2, and controller 2 is connected by optical fiber and Surveillance center 3 again
Connect；Experiment porch 1 includes simulation 10kV distribution lines, simulated high-pressure transformer station supply transformer and the neutral point device of simulation, mould
Intend switchgear, analog voltage transformer and analog current transformer, simulate distribution transformer, analogue ground control unit.This
The distributing automation apparatus technical performance that embodiment forms experiment porch 1, controller 2, Surveillance center 3 complete set is tested
Platform, experiment porch 1 generate the analog quantity dynamic data of power distribution network according to test request, and by communication link by analog quantity
Dynamic data is sent to Surveillance center 3, so as to form a complete test environment, solves power distribution automation in the prior art
The test environment of device is imperfect so as to the problem of can not obtaining partial data, by the running status of experiment porch 1 to distribution
The effect that automation equipment is completely tested, improve the reliability and security of distributing automation apparatus.
For experiment porch 1 using low-voltage equipment substitution high-tension apparatus, test parameters is consistent with high-voltage operation parameter, is pacified with operation
Entirely, the various failures in the experiment porch simulated high-pressure operational outfit of complete function, solve power distribution automation equipment point more minutes
Dissipate, with a varied topography, the live situation that can not be carried out linkage test, check and accept.Wherein, experiment porch 1 can verify that distribution line is grounded
Positioning function and simulation system voltage/current operation situation, simulated high-pressure transformer station supply transformer and neutral point device are not
Same earthing mode, simulation 220V A.C. contactors replace block switch, limit switch to adapt to spring mechanism and permanent magnet mechanism
It is remotely controlled, remote signalling demand, is simulated at analog line switchgear with voltage transformer summation current transformer for measuring and protecting use
On each section circuit single-phase earthing testing and control is simulated with three-phase transformer to verify the recognition capability protected to shoving.
Experiment porch 1 can verify that distribution line is grounded positioning function, and as shown in Figure 2, simulation 10kV distribution lines include
10kV three-phases loop, 10kV three-phases loop are switched on and off equipment and are divided into multiple section circuits, and line impedance is replaced by resistance R,
10kV route protections do not consider impedance angle typically, the short circuit current of each section can be limited into calculated value with resistance, resistance R values are pressed
Minimum mode configures, and verifies the sensitivity coefficient of definite value, according to capacitance current size in each section circuit, matches somebody with somebody on each section circuit
Piezoelectric capsule C is set low, capacitance current when forming single-phase earthing, checking ground connection positioning function.Experiment porch 1 can also simulation system electricity
Pressure/electric current operation situation, specifically, 10kV, voltage analog ratio are simulated with 0.1kVSimulated with 1A
1kA electric currents, current analog ratioThe capacities of short circuit of hundreds of megavolt-amperes can thus reduce to 100 ×
1000 times, capacity of experiment is usually no more than 3kVA, thus observes distribution circuit electric voltage/electric current operation situation.
Experiment porch 1 can simulated high-pressure transformer station supply transformer and neutral point device different earthing modes, such as accompanying drawing 3
Shown, simulated high-pressure transformer station supply transformer includes 0.4kV/0.1kV, Y/d-11 small power transformer 31, for simulating
The current filter 32 of grounding transformer, the current filter 32 are rated voltage 100V and by the zero of the connection of three-phase Z-type connection
Sequence current filter；Simulating neutral point device then includes being used for the inductance coil L for simulating arc suppression coil, inductance coil L induction reactance
Value is slightly less than the capacitor value of circuit and linear, crosses benefit amount and meets arc suppression coil operating provisions, and parameter is voluntarily on demand for inductance value
Coiling, for simulating the slide wire resistance R of neutral resistor, slide wire resistance R resistance can be adjusted as needed, Yi Jizhong
Property point switch SW0, disconnecting link K, neutral point voltage transformer TV0, neutral point current transformer TA0；Go out in small power transformer 31
Mouth is through neutral point switch SW0Current filter 32 is connected, current filter 32 passes through the first disconnecting link KLIt is connected with inductance coil L,
Current filter 32 passes through the second disconnecting link K simultaneouslyRIt is connected with slide wire resistance R, inductance coil L both ends connection neutral point voltage is mutual
Sensor TV0, inductance coil L and slide wire resistance R tail end all connects current transformer TA0, voltage is connected with 10KV analog bus
Transformer TVm, neutral point voltage transformer TV0Summation current transformer TA0Used respectively for measurement residual voltage and compensation electric current,
Utilize the tertiary voltage transformer TV connected on 10KV analog busm, bus residual voltage can be measured at open delta L, N.
Pass through neutral point switch SW0With disconnecting link KL, disconnecting link KRCooperation, above-mentioned connection can also form isolated neutral mode, through extinguishing arc
Coil earthing mode and through High Resistance Grounding Mode, specially disconnects neutral point switch SW0, form isolated neutral mode；
Close neutral point switch SW0, close disconnecting link KL, disconnect disconnecting link KR, form grounding through arc mode；Close neutral point switch
SW0, close disconnecting link KR, disconnect disconnecting link KL, form High Resistance Grounding Mode；E is the common of testboard.
Experiment porch 1 can simulate 220V A.C. contactors instead of block switch, limit switch to adapt to spring mechanism and forever
The remote control of magnetic mechanism, remote signalling demand, as shown in Figure 2, analog switch equipment include block switch SWF, limit switch SWZ, contact
Switch SWL, block switch SWF, limit switch SWZ, interconnection switch SWLFor connecting each section circuit, described section of switch SWF, eventually
End switch SWZ, interconnection switch SWLAll replace, as shown in Figure 4, A.C. contactor JC and control using 220V A.C. contactors JC
The link circuit of device 2 is the remote signalling amount of 220V A.C. contactors JC switching value connection controller 2,220V A.C. contactors JC
Tripping relay TJ, the jump, closing loop of closing relay HJ connections controller 2, the special circuit adapt to spring mechanism and
The remote control of permanent magnet mechanism, remote signalling demand.
Experiment porch 1 can be measured and protected with voltage transformer summation current transformer at analog line switchgear
With analog voltage transformer is 100V/100V voltage transformers, and as shown in Figure 2, in each line switching equipment, (segmentation is opened
Close SWF, limit switch SWZ, interconnection switch SWL) both sides be respectively provided with first voltage transformer TVabWith second voltage transformer
TVbc, first voltage transformer TVabIt is connected on A, B phase of circuit, second voltage transformer TVbcB, C phase of circuit are connected on, for protecting
Shield and measurement use.Analog current transformer is zero sequence current mutual inductor TA0, because the simulation short circuit current of testboard has dropped
It is low 1000 times, primary current transformer can be saved, circuit primary current is directly accessed to the current loop of controller 2, line
There are A phases, C connecting terminals D in road at switcha、Dc, accessed for controller 2；The capacitance current of experimental bench 1 presses 1:1 configuration, point
Duan Kaiguan SWF, limit switch SWZ, interconnection switch SWLMount point be equipped with zero sequence by design no-load voltage ratio, capacity and defined polarity
Current transformer TA0, zero sequence current mutual inductor TA0Secondary side accessed for controller 2.
Experiment porch 1 can be simulated on each section circuit with three-phase transformer to verify the recognition capability protected to shoving, by
It is characterized in that circuit is short, definite value is low and without time limit in 10kV section route protections, it is different with the three-stage excessively stream of routine, hide
Setting valve can neither be improved, can not extend the time limit, it is necessary to which special measures prevent malfunction of shoving by crossing to shove.Simulate distribution transformer
For D/y0 low capacity three-phase transformers, some D/y0 low capacity three-phase transformers, checking 10kV areas are configured on section circuit
Section route protection is to the recognition capability shoved.
Experiment porch 1 can simulate single-phase earthing testing and control, be single-phase earthing unit of testing and controlling as shown in Figure 5
Circuit connection diagram, analogue ground control unit includes the slide wire resistance R of touchdown time controller SKZ and series connection with it, described to connect
Ground moment controller SKZ controls the break-make moment of residual voltage, the amplitude of the slide wire resistance R controls output voltage, to meet
Test needs.When the first disconnecting link K1, the second disconnecting link K2 and the 3rd disconnecting link K3 close, realize that stable metal is grounded；Second knife
Lock K2, the 3rd disconnecting link K3 close, and the first disconnecting link K1 disconnects, and realize that stability transition resistance is grounded；First disconnecting link K1, the 3rd knife
Lock K3 closes, and the second disconnecting link K2 disconnects, and realizes that metallicity indirect arc is grounded；3rd disconnecting link K3 closes, the first disconnecting link K1,
Two disconnecting link K2 disconnect, and realize that transition resistance indirect arc is grounded.
Because prior art can not substitute live Coupled motion experiment, it can not verify that the overall technology of distribution automatics refers to
Mark, more verifies the technical performance of distribution automation device, this implementation not on powered high-tension line as short-circuit test
Example can exist as the combined debugging and factory inspection and acceptance test platform of distribution automation equipment suitable for test distribution automation equipment
In the case of phase fault, single-phase earthing occurs in distribution line, circuit automatic switch, controller, Surveillance center, which cooperate, to be realized
Failure removal, isolation and self-healing procedure, specific experiment process are as follows：
1st, section phase fault is tested
Circuit transient fault is tested
As shown in Figure 2, successively in each section circuit moment short circuit A, B phase (or B, C phase), checking has communication and without logical
Fault section switch trip~successful reclosing can be realized during letter, when communicating normal, Surveillance center 3 shows correctly.
Permanent fault is tested
Successively each section circuit fix short circuit A, B phase (or B, C phase), checking have communication and without communication when can realize
Fault section switch trip~coincidence~tripping operation locking, interconnection switch turn to supply successful operation program, communication to non-fault line
When normal, Surveillance center 3 shows correctly.
2nd, power supply experiment is turned
Turn to test for line fault
This line upstream section fault, during turning to supply by interconnection switch, simulate aforesaid operations, it is checking transient fault, permanent
Property failure, have communication and without communication when operation program, when communicating normal, Surveillance center 3 shows correctly.
3rd, single-line to ground fault, excision, isolation
Single phase grounding test
In each track section of circuit, based on contract technical conditions, as shown in Figure 5, by single-phase earthing test program, have
Body is single-phase earthing unit of testing and controlling, including the touchdown time controller SKZ and slide wire resistance R of series connection with it, the ground connection
Moment controller SKZ controls the break-make moment of residual voltage, the amplitude of the slide wire resistance R controls output voltage, when the first knife
Lock K1, the second disconnecting link K2 and the 3rd disconnecting link K3 close, and realize that stable metal is grounded；Second disconnecting link K2, the 3rd disconnecting link K3 are closed
On, the first disconnecting link K1 disconnects, and realizes that stability transition resistance is grounded；First disconnecting link K1, the 3rd disconnecting link K3 close, the second disconnecting link K2
Disconnect, realize that metallicity indirect arc is grounded；3rd disconnecting link K3 closes, and the first disconnecting link K1, the second disconnecting link K2 disconnect, and realize
Cross resistance indirect arc ground connection.Single phase grounding test is done by said procedure, Surveillance center (3) sends the ×× section ×× moment
Generation single-phase earthing signal；K3 is disconnected, Surveillance center (3) sends the disappearance of ×× section ×× moment single-phase earthing.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (5)
1. distributing automation apparatus technical performance test platform, including experiment porch (1), controller (2) and Surveillance center (3),
The experiment porch (1) is connected with controller (2), and controller (2) is connected by optical fiber with Surveillance center (3) again, the experiment
Platform (1) includes simulation 10kV distribution lines, simulated high-pressure transformer station supply transformer and the neutral point device of simulation, analog switch
Equipment, analog voltage transformer and analog current transformer, simulate distribution transformer, analogue ground control unit；The simulation
10kV distribution lines include 10kV three-phases loop, and 10kV three-phases loop is switched on and off equipment and is divided into multiple section circuits, passes through inductance
Or resistance replaces line impedance；And according to capacitance current size in each section circuit, low-voltage capacitance is configured on each section circuit
Device (C), it is characterised in that：Simulated high-pressure transformer station supply transformer becomes including 0.4kV/0.1kV, Y/d-11 Miniature Power Unit
Depressor (31), current filter (32)；Simulating neutral point device then includes inductance coil (L), for simulating neutral resistor
Slide wire resistance (R), and neutral point switch (SW0), disconnecting link (K), neutral point voltage transformer (TV0), neutral point current transformer
(TA0)；Pass through neutral point switch (SW in power transformer (31) outlet0) connection current filter (32), current filter (32)
It is connected by disconnecting link (K) with inductance coil (L) and slide wire resistance (R), the both ends connection neutral point voltage mutual inductance of inductance coil (L)
Device (TV0), the tail end of inductance coil (L) and slide wire resistance (R) is all connected with neutral point current transformer (TA0)。
2. distributing automation apparatus technical performance test platform according to claim 1, it is characterised in that：The simulation is opened
Closing equipment includes block switch (SWF), limit switch (SWZ), interconnection switch (SWL), block switch (SWF), limit switch
(SWZ), interconnection switch (SWL) be used to connect each section circuit, the block switch (SWF), limit switch (SWZ), interconnection switch
(SWL) it is 220V A.C. contactors (JC).
3. distributing automation apparatus technical performance test platform according to claim 2, it is characterised in that：The simulation electricity
Pressure transformer is 100V/100V voltage transformers, and first voltage transformer is respectively provided with the both sides of each line switching equipment
(TVab) and second voltage transformer (TVbc), first voltage transformer (TVab) it is connected on A, B phase of circuit, second voltage transformer
(TVbc) it is connected on B, C phase of circuit；The analog current transformer is zero sequence current mutual inductor (TA0), the block switch
(SWF), limit switch (SWZ), interconnection switch (SWL) mount point be equipped with zero sequence current mutual inductor (TA0)。
4. distributing automation apparatus technical performance test platform according to claim 3, it is characterised in that：The simulation is matched somebody with somebody
Piezoelectric transformer is D/y0 low capacity three-phase transformers, and some phase-change pressures of D/y0 low capacities three are configured on the section circuit
Device, to verify 10kV sections route protection to the recognition capability shoved.
5. the distributing automation apparatus technical performance test platform according to claim 1 or 4, it is characterised in that：The mould
Intending ground connection control unit includes touchdown time controller (SKZ) and the slide wire resistance (R) of series connection with it, the touchdown time control
Device (SKZ) controls the break-make moment of residual voltage, the amplitude of slide wire resistance (R) the control output voltage.
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| CN201510057024.5A CN104597899B (en) | 2015-02-04 | 2015-02-04 | Distributing automation apparatus technical performance test platform |
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| CN201510057024.5A CN104597899B (en) | 2015-02-04 | 2015-02-04 | Distributing automation apparatus technical performance test platform |
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| CN106159920B (en) * | 2016-08-30 | 2018-08-21 | 泉州维盾电气有限公司 | A kind of 10kV power grids feeder fault processing physics simulator |
| CN109765439A (en) * | 2018-12-07 | 2019-05-17 | 国网宁夏电力有限公司电力科学研究院 | Feeder test method based on secondary singal |
| CN109638824B (en) * | 2018-12-21 | 2024-04-09 | 天津浩源汇能股份有限公司 | Layout structure of feeder automation simulation system |
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| US7062359B2 (en) * | 2000-12-29 | 2006-06-13 | Abb Ab | Substation control system |
| JP2003289528A (en) * | 2002-03-28 | 2003-10-10 | Toshiba Corp | Remote monitoring system and monitoring control method for the same |
| CN1216294C (en) * | 2002-07-03 | 2005-08-24 | 广州智光电气有限公司 | Method for testing single phase grounding current of electric power network |
| CN100501419C (en) * | 2007-03-16 | 2009-06-17 | 长沙理工大学 | Neutral-point earth-free distributing network direct-to-ground capacitance current measuring method |
| CN201740828U (en) * | 2010-07-02 | 2011-02-09 | 北京水木源华电气有限公司 | Integral test instrument of power distribution transformer |
| CN203881876U (en) * | 2014-06-11 | 2014-10-15 | 国家电网公司 | Modularized and integrated system for dynamic simulation and terminal detection of power distribution network |
| CN204440161U (en) * | 2015-02-04 | 2015-07-01 | 国家电网公司 | A kind of distributing automation apparatus technical feature test platform |
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