CN203798929U

CN203798929U - Single-phase ground fault simulation testing platform of power distribution network

Info

Publication number: CN203798929U
Application number: CN201420167435.0U
Authority: CN
Inventors: 王涛
Original assignee: Jinan Zhi Zhen Electric Applicance Co Ltd
Current assignee: Jinan Zhi Zhen Electric Applicance Co Ltd
Priority date: 2014-04-08
Filing date: 2014-04-08
Publication date: 2014-08-27
Anticipated expiration: 2024-04-08

Abstract

The utility model relates to a single-phase ground fault simulation testing platform of a power distribution network. The testing platform comprises a simulated zero-sequence network module and a simulated zero-sequence power supply control module. The simulated zero-sequence network module includes a plurality of pi-shaped equivalent circuits, wherein the front ends of the circuits are connected with a bus; a current transformer is arranged at the circuit between each pi-shaped equivalent circuit and the bus; and a tested device is connected by the secondary side of the current transformer. The simulated zero-sequence power supply control module consists of an adjustable transformer, an adjustable inductor, an adjustable resistor, a control switch and a multi-path switch, wherein the components are successively connected in series. According to the testing platform, line selection function testing with different fault types, different ground time intervals, and different lines under fault adjustment can be realized; and the multi-path zero-sequence current changing process of the power grid single-phase fault of the actual low-current ground system can be simulated. Moreover, the equipment cost is low; the operation is convenient; time and effort are saved; and the testing efficiency is high.

Description

A kind of one-phase earthing failure in electric distribution network analog testing platform

(1) technical field

The utility model relates to power system simulation emulation field, particularly a kind of one-phase earthing failure in electric distribution network analog testing platform.

(2) background technology

At present, China's 6-66kv power network neutral point adopts not direct grounding way of neutral point more, in this system, while there is singlephase earth fault, although system can continue operation, but during due to ground connection, healthy phases voltage-to-ground raises, particularly when intermittent arc grounding fault, can produce arc overvoltage, serious harm system insulation and device security, therefore when power distribution network generation single-phase earthing, need to by Small Electric Current Earthing And Routing Device select there is the circuit of ground connection and send in time signal or report combine from or dispatching center, fault is processed.

Domestic Small Electric Current Earthing And Routing Device at present, the route selection principles, structural design, logical algorithm that adopt etc. are different, its performance characteristics is also different, select suitable product to bring larger difficulty to power supply enterprise, therefore Small Electric Current Earthing And Routing Device route selection function is carried out to functional test tool and be of great significance.At present, the method for testing of line selection apparatus function is mainly contained to three kinds, the first is to utilize relay-protection tester device to carry out; The second is to utilize the RTDS l-G simulation test of scientific research institutions to test; The third is artificial earthing's site test.First method cannot be simulated the multichannel zero-sequence current change procedure of actual small current neutral grounding system electrical network single-phase fault, thereby route selection function that can not Complete test line selection apparatus; The RTDS emulator cost that second method is used is higher, is generally in various places Electric Power Section institute set of organizations and tests, and is difficult for popularizing; The third method needs manually to carry out short circuit operation on the spot, and test process is wasted time and energy, and efficiency is lower.

(3) summary of the invention

The utility model is in order to make up the deficiencies in the prior art, a kind of rational in infrastructure, convenient and practical one-phase earthing failure in electric distribution network analog testing platform is provided, this analog testing platform can be realized the route selection functional test under the fault accommodation such as different faults type, the different ground connection time interval, different circuits, can simulate the multichannel zero-sequence current change procedure of actual small current neutral grounding system electrical network single-phase fault, equipment cost is lower, be easy to promote the use of, simultaneously easy to operate, time saving and energy saving, testing efficiency is higher, has solved problems of the prior art.

The utility model is achieved by the following technical solution:

A kind of one-phase earthing failure in electric distribution network analog testing platform, comprises analogue zero sequence network module and simulation zero sequence energy supply control module, described analogue zero sequence network module comprises the π type equivalent circuit that some head ends are connected with bus, on the circuit between each π type equivalent circuit and bus, be equipped with a current transformer, equipment under test is by the secondary side access of current transformer, described simulation zero sequence energy supply control module comprises the transtat of series connection successively, controllable impedance, adjustable resistance, gauge tap and multi-way switch, external power source is connected with transtat by wire, the primary side joint of multi-way switch is connected with gauge tap, several joints of secondary side are corresponding connected one by one with the end of several π type equivalent circuits respectively.

After described π type equivalent circuit is connected by resistance and inductance, then form with two Capacitance parallel connections, resistance is connected with bus with the head end after inductance series connection, and end is connected with the joint of the secondary side of multi-way switch.

The beneficial effects of the utility model are: analog testing platform can be realized the route selection functional test under the fault accommodation such as different faults type, the different ground connection time interval, different circuits, can simulate the multichannel zero-sequence current change procedure of actual small current neutral grounding system electrical network single-phase fault, equipment cost is lower, be easy to promote the use of, simultaneously easy to operate, time saving and energy saving, testing efficiency is higher.

(4) brief description of the drawings

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is structural representation of the present utility model;

Fig. 2 is π type equivalent circuit schematic diagram in Fig. 1;

In figure, 1, π type equivalent circuit, 2, external power source, 3, transtat, 4, controllable impedance, 5, adjustable resistance, 6, gauge tap, 7, multi-way switch, 8, current transformer.

(5) embodiment

For clearly demonstrating the technical characterstic of this programme, below by embodiment, and in conjunction with its accompanying drawing, the utility model is elaborated.

As shown in Fig. 1-Fig. 2, a kind of one-phase earthing failure in electric distribution network analog testing platform, comprises analogue zero sequence network module and simulation zero sequence energy supply control module, described analogue zero sequence network module comprises the π type equivalent circuit 1 that some head ends are connected with bus, on the circuit between each π type equivalent circuit 1 and bus, be equipped with a current transformer 8, equipment under test is by the secondary side access of current transformer 8, described simulation zero sequence energy supply control module comprises the transtat 3 of series connection successively, controllable impedance 4, adjustable resistance 5, gauge tap 6 and multi-way switch 7, external power source 2 is connected with transtat 3 by wire, the primary side joint of multi-way switch 7 is connected with gauge tap 6, several joints of secondary side are corresponding connected one by one with the end of several π type equivalent circuits 1 respectively.

After described π type equivalent circuit is connected by resistance and inductance, then form with two Capacitance parallel connections, resistance is connected with bus with the head end after inductance series connection, and end is connected with the joint of the secondary side of multi-way switch 7.The π type equivalent circuit 1 that analogue zero sequence network module adopts is to compose in parallel with 2 capacitor C after resistance R and inductance L series connection again, in testing process, can be according to the different demands of power supply enterprise, select R, L, the C of different parameters, the zero sequence equivalent network of simulating the single line of different length.

When detection, tested Small Electric Current Earthing And Routing Device is connected with the secondary side of the current transformer on the circuit being arranged between each π type equivalent circuit 1 and bus, connect external power source, simulate the transtat 3 in zero sequence energy supply control module by adjusting, controllable impedance 4 and adjustable resistance 5 can simulating grid single-phase fault multichannel zero-sequence current change procedure, the various fault types that may occur in simulation actual electric network, the gauge tap 6 of simulating in zero sequence energy supply control module by adjusting can arrange the lasting time of fault, simulate the multi-way switch 7 in zero sequence energy supply control module by adjustment, can select different π type equivalent circuits 1 to access, carry out the situation that in simulating reality, different circuits break down.In the process regulating, observe tested Small Electric Current Earthing And Routing Device and whether can make corresponding judgement according to adjusting, if Small Electric Current Earthing And Routing Device can accurately be judged fault type and faulty line, illustrate that tested Small Electric Current Earthing And Routing Device is working properly, can in this environment, normally use.

Adopt one-phase earthing failure in electric distribution network analog testing platform of the present utility model, reasonable in design, analog testing platform can be realized the route selection functional test under the fault accommodation such as different faults type, the different ground connection time interval, different circuits, can simulate the multichannel zero-sequence current change procedure of actual small current neutral grounding system electrical network single-phase fault, equipment cost is lower, is easy to promote the use of, simultaneously easy to operate, time saving and energy saving, testing efficiency is higher.

The utility model does not describe part in detail, is those skilled in the art of the present technique's known technology.Finally explanation is, above embodiment is only unrestricted in order to the technical solution of the utility model to be described, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement the technical solution of the utility model, and not departing from aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of claim scope of the present utility model.

Claims

1. an one-phase earthing failure in electric distribution network analog testing platform, is characterized in that: comprise analogue zero sequence network module and simulation zero sequence energy supply control module, described analogue zero sequence network module comprises the π type equivalent circuit that some head ends are connected with bus, on the circuit between each π type equivalent circuit and bus, be equipped with a current transformer, equipment under test is by the secondary side access of current transformer, described simulation zero sequence energy supply control module comprises the transtat of series connection successively, controllable impedance, adjustable resistance, gauge tap and multi-way switch, external power source is connected with transtat by wire, the primary side joint of multi-way switch is connected with gauge tap, several joints of secondary side are corresponding connected one by one with the end of several π type equivalent circuits respectively.

2. a kind of one-phase earthing failure in electric distribution network analog testing platform according to claim 1, it is characterized in that: after described π type equivalent circuit is connected by resistance and inductance, again with two Capacitance parallel connection compositions, resistance is connected with bus with the head end after inductance series connection, and end is connected with the joint of the secondary side of multi-way switch.