CN215599288U - Distribution intelligent terminal grounding performance testing device - Google Patents
Distribution intelligent terminal grounding performance testing device Download PDFInfo
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- CN215599288U CN215599288U CN202122022106.XU CN202122022106U CN215599288U CN 215599288 U CN215599288 U CN 215599288U CN 202122022106 U CN202122022106 U CN 202122022106U CN 215599288 U CN215599288 U CN 215599288U
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Abstract
The utility model provides a grounding performance testing device for an intelligent power distribution terminal, which comprises: the intelligent terminal testing system comprises a digital simulator, an output board card, an input board card, one or more intelligent terminal testers and a power distribution intelligent terminal corresponding to the intelligent terminal testers; the digital simulator is connected with an output board card through an optical fiber, the output board card outputs a small analog quantity signal to the intelligent terminal tester, and the intelligent terminal tester outputs a voltage and current analog quantity to the intelligent power distribution terminal; and the intelligent power distribution terminal returns the remote signaling signal to the digital simulator through the input board card. According to the closed-loop grounding performance testing device, the closed-loop grounding performance testing device is constructed through the digital simulator, the output board card, the input board card and the intelligent terminal tester, the device is based on modular design, expansion can be carried out according to different equipment types and testing requirements, a 10kV single-bus segmented digital simulation model is constructed, different neutral point grounding modes are simulated, and different types of grounding faults and operation mode testing are carried out.
Description
Technical Field
The application belongs to the technical field of power distribution network fault testing, and particularly relates to a grounding performance testing device for a power distribution intelligent terminal.
Background
When a single-phase earth fault occurs in a small-current earth system of a power distribution network, the fault current is small, the phase voltage difference between a fault phase voltage and a non-fault phase voltage is not large, and the operation with the fault is allowed to be carried out for two hours according to the operation regulations of the old power distribution network. However, the single-phase earth fault affects the insulation performance of the distribution network equipment, and the single-phase earth fault may develop into an interphase short-circuit fault. Therefore, after the single-phase earth fault occurs in the power distribution network, it is very important to identify the fault timely and accurately. After the small-current grounding system has single-phase grounding fault, the fault characteristics are not obvious, and the identification difficulty of intelligent power distribution equipment is high. With the gradual improvement of power supply reliability requirements of power users, most of power distribution intelligent terminals have a ground fault identification function. At present, the ground fault recognition capability of various types of intelligent power distribution terminals has a large difference, and it is necessary to carry out a ground performance test before the intelligent power distribution terminals are connected to a network.
The performance test of the existing grounding line selection device is mainly divided into a true test, a physical simulation test and a digital simulation test. Compared with a true test and a physical simulation test, the digital simulation test can flexibly set various parameters in simulation equipment and simulate a power distribution network topological structure and a fault scene close to an engineering site. The digital simulation grounding performance test mainly utilizes electromagnetic transient simulation software such as PSCAD (power system computer aided design), MATLAB (matrix laboratory) and the like to simulate various grounding fault waveforms, and applies electric quantity to the intelligent power distribution terminal through a relay protection tester or a power distribution terminal tester through a waveform playback function. The method belongs to an off-line testing method, and model parameters cannot be adjusted in the testing process.
SUMMERY OF THE UTILITY MODEL
The application provides a distribution intelligent terminal grounding performance testing device to at least solve the problem that the current offline grounding line selection device cannot adjust parameters of a model in the testing process.
According to the application, a distribution intelligent terminal grounding performance testing device is provided, including:
the intelligent terminal testing system comprises a digital simulator, an output board card, an input board card, one or more intelligent terminal testers and a power distribution intelligent terminal corresponding to the intelligent terminal testers;
the digital simulator is connected with an output board card through an optical fiber, the output board card outputs a small analog quantity signal to the intelligent terminal tester, and the intelligent terminal tester outputs a voltage and current analog quantity to the intelligent power distribution terminal;
and the intelligent power distribution terminal returns the remote signaling signal to the digital simulator through the input board card.
In an embodiment, the digital simulator is a 10kV single bus segmented topology, and includes two buses, which are a first bus and a second bus respectively.
In one embodiment, the first bus bar is divided into two branches, and the two branches are connected in series through a resistor.
In one embodiment, the two branches are respectively configured with a grounding variable interval
In one embodiment, the first branch is connected with a plurality of 10kV feeders, and different feeders are respectively provided with a switching station and a large branch.
In one embodiment, the second branch is connected with a plurality of 10kV feeders, and pure overhead lines, pure cable lines and overhead cable mixed lines are respectively configured on different feeders.
In one embodiment, the output board outputs a dc voltage signal to the intelligent terminal tester.
In one embodiment, the output cards are scalable.
In one embodiment, the input board card is a switching value input.
In one embodiment, the first branch is connected to the second busbar.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a closed-loop power distribution intelligent terminal grounding performance testing device provided by the present application.
FIG. 2 is a schematic diagram of a ground performance test simulation model built in a digital simulator according to the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The performance test of the existing grounding line selection device is mainly divided into a true test, a physical simulation test and a digital simulation test. Compared with a true test and a physical simulation test, the digital simulation test can flexibly set various parameters in simulation equipment and simulate a power distribution network topological structure and a fault scene close to an engineering site. The digital simulation grounding performance test mainly utilizes electromagnetic transient simulation software such as PSCAD (power system computer aided design), MATLAB (matrix laboratory) and the like to simulate various grounding fault waveforms, and applies electric quantity to the intelligent power distribution terminal through a relay protection tester or a power distribution terminal tester through a waveform playback function. The method belongs to an off-line testing method, and model parameters cannot be adjusted in the testing process.
The application provides a device for testing grounding performance of a closed-loop power distribution intelligent terminal and provides a corresponding testing method. A closed-loop grounding performance testing device is built by utilizing a digital simulator, an input/output board card and an intelligent terminal tester. The digital simulator can build a digital simulation model according to the actual network topological structure and the equipment parameters of the engineering field, and flexibly simulate different operation conditions. Meanwhile, the device is based on modular design, modular expansion can be carried out according to test requirements, and the grounding performance test requirements of different intelligent power distribution equipment are met.
As shown in fig. 1, the device for testing grounding performance of a closed-loop power distribution intelligent terminal provided by the present application includes: the intelligent terminal testing system comprises a digital simulator, an output board card, an input board card, one or more intelligent terminal testers and a power distribution intelligent terminal corresponding to the intelligent terminal testers;
the digital simulator is connected with an output board card through an optical fiber, the output board card outputs a small analog quantity signal to the intelligent terminal tester, and the intelligent terminal tester outputs a voltage and current analog quantity to the intelligent power distribution terminal;
and the intelligent power distribution terminal returns the remote signaling signal to the digital simulator through the input board card.
In an embodiment, the digital simulator is a 10kV single bus segmented topology, and includes two buses, which are a first bus and a second bus respectively.
In one embodiment, the first bus bar is divided into two branches, and the two branches are connected in series through a resistor.
In one embodiment, the two branches are respectively configured with a grounding variable interval
In one embodiment, the first branch is connected with a plurality of 10kV feeders, and different feeders are respectively provided with a switching station and a large branch.
In one embodiment, the second branch is connected with a plurality of 10kV feeders, and pure overhead lines, pure cable lines and overhead cable mixed lines are respectively configured on different feeders.
In one embodiment, the output board outputs a dc voltage signal to the intelligent terminal tester.
In one embodiment, the output cards are scalable.
In one embodiment, the input board card is a switching value input.
In one embodiment, the first branch is connected to the second busbar.
In a specific embodiment, a grounding performance test simulation model (the simulation model is shown in fig. 2) is built in a digital simulator to simulate different operation conditions of the power distribution network. The digital simulator is connected with the output board card through the optical fiber, and the output board card outputs a small analog quantity signal to the intelligent terminal tester. The intelligent terminal tester outputs voltage and current analog quantity to the intelligent power distribution terminal, and the intelligent power distribution terminal sends remote signaling signals back to the digital simulator through the input board card to form closed-loop linkage test of the digital simulator and the intelligent power distribution terminal. The intelligent terminal tester can output 3 groups of voltage analog quantities and 3 groups of current analog quantities, and the output board card can be connected with a plurality of intelligent terminal testers. The number of the intelligent terminal testers can be adjusted according to the type of the intelligent power distribution terminal and the test requirements.
A10 kV single-bus segmented topological structure is constructed, buses 1-1 and buses 1-2 are respectively powered by different power supplies, an infinite system is arranged on the system side, and the transformation ratio of a main transformer is 110kV/10 kV. The two sections of buses are respectively provided with grounding variable intervals, and neutral points can be set in a non-grounding mode, a grounding mode through arc suppression coils or a grounding mode through small resistors. The bus 1-1 is provided with 4 10kV feeders, and different feeders are respectively provided with a switch station and a large branch. The bus 1-2 is provided with 4 10kV feeders which are respectively configured into a pure overhead line, a pure cable line and an overhead cable mixed line. The feeder configuration can be flexibly adjusted according to the test requirements.
The output board card is analog output, and each board card can output 32 groups of direct current voltage signals. When 32 sets of analog outputs are not enough, the expansion can be performed. The input board card is the switching value input, and each board card can receive 64 groups of switching value signals.
In a specific embodiment, the rated parameters of the intelligent terminal tester are specifically as follows:
output of AC voltage
Phase voltage output (effective value): 0-300V;
line voltage output (effective value): 0 to 519V;
and (3) outputting precision: plus or minus 0.05 percent;
voltage output power: 50 VA;
frequency range (fundamental): 0-1200 Hz;
harmonic frequency: 1-24 times.
Output of alternating current
Phase current output (effective value): 0-30A;
and (3) outputting precision: plus or minus 0.05 percent;
current maximum output power: 500 VA;
frequency range: 0-1200 Hz;
harmonic frequency: 1-24 times.
How the grounding performance test is performed by the device is described as follows:
the zero sequence voltage measurement accuracy of the tested device should meet the requirements of table 1. Zero sequence voltage was applied 5 times and the measurement accuracy was expressed as the maximum relative error.
TABLE 1 zero sequence voltage measurement accuracy requirement
The zero sequence current measurement accuracy of the tested device should meet the requirements of table 2. Zero sequence current was applied 5 times and the measurement accuracy was expressed as the maximum relative error.
TABLE 2 measurement accuracy requirements for zero sequence current
The grounding performance test method for the non-grounding system of the neutral point comprises the following steps:
1. single-phase earth fault with fault position as feed line head end
The initial angle of the fault is 90 degrees, the fault phase is A phase, the total harmonic content is selected to be 6.0 percent, and the intermittent earth fault with the fault transition resistance of 36 ohms, the stable earth fault with the fault transition resistance of 720 ohms and the soliton earth fault are respectively tested;
the initial angle of the fault is 90 degrees, the fault phase is A phase, the total harmonic content is selected to be 1.0 percent, and the intermittent earth fault with the fault transition resistance of 36 ohms, the stable earth fault with the fault transition resistance of 720 ohms and the soliton earth fault are respectively tested.
2. Single-phase earth fault with fault position as middle section of feeder line
Selecting a pure overhead line, wherein the initial fault angle is 75 degrees, the fault phase is B phase, the total harmonic content is 6.0 percent, and testing an intermittent earth fault with a fault transition resistance of 36 ohms, a stable earth fault with a fault transition resistance of 720 ohms and a solitary light earth fault respectively;
selecting a pure overhead line, wherein the initial fault angle is 75 degrees, the fault phase is B phase, the total harmonic content is 1.0 percent, and testing an intermittent earth fault with a fault transition resistance of 36 ohms, a stable earth fault with a fault transition resistance of 720 ohms and a solitary light earth fault respectively;
selecting a pure cable line, wherein the initial fault angle is 60 degrees, the fault phase is C phase, the total harmonic content is 6.0 percent, and testing an intermittent earth fault with a fault transition resistance of 36 ohms, a stable earth fault with a fault transition resistance of 720 ohms and a solitary light earth fault respectively;
selecting a pure cable line, wherein the initial fault angle is 60 degrees, the fault phase is C phase, the total harmonic content is 1.0 percent, and testing an intermittent earth fault with a fault transition resistance of 36 ohms, a stable earth fault with a fault transition resistance of 720 ohms and a solitary light earth fault respectively;
selecting an overhead cable mixed line, wherein the initial fault angle is 30 degrees, the fault phase is an A phase, the total harmonic content is 6.0 percent, and testing an intermittent earth fault with a fault transition resistance of 36 ohms, a stable earth fault with a fault transition resistance of 720 ohms and a soliton earth fault respectively;
selecting an overhead cable mixed line, wherein the initial fault angle is 30 degrees, the fault phase is A phase, the total harmonic content is 1.0 percent, and testing an intermittent earth fault with a fault transition resistance of 36 ohms, a stable earth fault with a fault transition resistance of 720 ohms and an isolated light earth fault respectively.
3. Single-phase earth fault with fault position at end of feeder line
The initial fault angle is 0 degrees, the fault phase is B phase, the total harmonic content is selected to be 6.0 percent, and the intermittent earth fault with the fault transition resistance of 36 ohms, the stable earth fault with the fault transition resistance of 720 ohms and the soliton earth fault are respectively tested;
the initial fault angle is 0 degrees, the fault phase is B phase, the total harmonic content is 1.0 percent, and the intermittent earth fault with the fault transition resistance of 36 ohms, the stable earth fault with the fault transition resistance of 720 ohms and the soliton earth fault are respectively tested.
4. Single-phase earth fault with branch fault position
The initial angle of the fault is 45 degrees, the fault phase is C phase, the total harmonic content is selected to be 6.0 percent, and the intermittent earth fault with the fault transition resistance of 36 ohms, the stable earth fault with the fault transition resistance of 720 ohms and the soliton earth fault are respectively tested;
the initial angle of the fault is 45 degrees, the fault phase is C phase, the total harmonic content is 1.0 percent, and the intermittent earth fault with the fault transition resistance of 36 ohms, the stable earth fault with the fault transition resistance of 720 ohms and the soliton earth fault are respectively tested.
5. Single-phase earth fault with bus as fault position
The initial angle of the fault is 60 degrees, the fault phase is A phase, the total harmonic content is selected to be 6.0 percent, and the intermittent earth fault with the fault transition resistance of 36 ohms, the stable earth fault with the fault transition resistance of 720 ohms and the soliton earth fault are respectively tested;
the initial angle of the fault is 60 degrees, the fault phase is A phase, the total harmonic content is selected to be 1.0 percent, and the intermittent earth fault with the fault transition resistance of 36 ohms, the stable earth fault with the fault transition resistance of 720 ohms and the soliton earth fault are respectively tested.
6. Testing under special conditions
Testing the action behaviors of the primary and secondary disconnection devices of the bus voltage transformer;
testing the action behavior of the device when the ferroresonance occurs;
the action behavior under the condition of three-phase unbalance of the system (with zero sequence voltage amplitude as a reference, the unbalanced voltage of the secondary side of the voltage transformer is 10V, 3V and 1V);
the test fault is the action behavior of in-phase two-point grounding;
testing the working behaviors of different cross grounds;
testing the switching of a feeder line where a fault is located between two sections of buses, and grounding action after each switching;
testing the action behavior of the parallel operation of the two sections of buses;
testing the action behavior of the ring network power supply;
and testing the action behaviors that the feeder load is switched from light load to heavy load and from heavy load to light load.
The closed-loop grounding performance testing device is constructed through a digital simulator, an output board card, an input board card and an intelligent terminal tester, can be expanded according to different equipment types and testing requirements based on modular design, is constructed on the basis of modular design, simulates different neutral point grounding modes, and tests of different types of grounding faults and operation modes are carried out; this application not only improves to the device, still provides distribution intelligent terminal ground connection capability test project and test procedure.
The principle and the implementation mode of the utility model are explained by applying specific embodiments in the utility model, and the description of the embodiments is only used for helping to understand the method and the core idea of the utility model; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. Although the embodiments herein provide technical content as described in the embodiments, more or less technical content may be included based on conventional or non-inventive means.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In the description herein, references to the description of "an embodiment," "a particular embodiment," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments herein.
Claims (10)
1. The utility model provides a distribution intelligent terminal ground connection capability test device which characterized in that includes:
the intelligent terminal testing system comprises a digital simulator, an output board card, an input board card, one or more intelligent terminal testers and a power distribution intelligent terminal corresponding to the intelligent terminal testers;
the digital simulator is connected with the output board card through an optical fiber, the output board card outputs a small analog quantity signal to the intelligent terminal tester, and the intelligent terminal tester outputs a voltage and current analog quantity to the intelligent power distribution terminal;
and the power distribution intelligent terminal returns a remote signaling signal to the digital simulator through the input board card.
2. The grounding performance testing device for the intelligent power distribution terminal according to claim 1, wherein the digital simulator is of a 10kV single-bus segmented topology structure and comprises two buses, namely a first bus and a second bus.
3. The grounding performance testing device for the intelligent distribution terminal as recited in claim 2, wherein the first bus bar is divided into two branches, and the two branches are connected in series through a resistor.
4. The grounding performance testing device for the intelligent power distribution terminal as claimed in claim 3, wherein the two branches are respectively configured with grounding variable intervals.
5. The grounding performance testing device for the intelligent distribution terminal as claimed in claim 4, wherein a plurality of 10kV feeders are connected to a first branch, and a switching station and a large branch are respectively arranged on different feeders.
6. The grounding performance testing device for the intelligent distribution terminal as claimed in claim 5, wherein a plurality of 10kV feeders are arranged in the second branch connection, and a pure overhead line, a pure cable line and an overhead cable mixed line are respectively arranged on different feeders.
7. The grounding performance testing device for the intelligent power distribution terminal as claimed in claim 6, wherein the output board card outputs a direct current voltage signal to the intelligent terminal tester.
8. The grounding performance testing device for the intelligent power distribution terminal as claimed in claim 7, wherein the output board card is expandable.
9. The grounding performance testing device for the intelligent power distribution terminal as claimed in claim 8, wherein the input board card is a switching value input.
10. The grounding performance testing device for the intelligent power distribution terminal as recited in claim 9, wherein the first branch is connected with the second bus.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115184729A (en) * | 2022-07-20 | 2022-10-14 | 国网辽宁省电力有限公司电力科学研究院 | Simulation system and method for automatically detecting and processing intermittent arc grounding fault |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115184729A (en) * | 2022-07-20 | 2022-10-14 | 国网辽宁省电力有限公司电力科学研究院 | Simulation system and method for automatically detecting and processing intermittent arc grounding fault |
| CN115184729B (en) * | 2022-07-20 | 2023-07-11 | 国网辽宁省电力有限公司电力科学研究院 | Simulation system and method for automatically detecting and processing intermittent arc ground faults |
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