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ADPSS (advanced digital power system simulator) based test system for low current grounding line selector and test method of system

A technology of small current grounding and line selection devices, which is applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problems of not cutting off in time and affecting the safety of the power grid, and achieve the effect of dynamic detection

Inactive Publication Date: 2015-12-02
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In many domestic wind farms, the single-phase fault of the 35kV system has not been cut off in time, which has induced complex faults inside the wind farm, resulting in a chain reaction cut-out accident of the wind turbine group with low voltage ride-through failure in the area, which has greatly affected the safety of the power grid.

Method used

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  • ADPSS (advanced digital power system simulator) based test system for low current grounding line selector and test method of system
  • ADPSS (advanced digital power system simulator) based test system for low current grounding line selector and test method of system
  • ADPSS (advanced digital power system simulator) based test system for low current grounding line selector and test method of system

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specific Embodiment approach 1

[0024] Specific implementation mode 1. Combination figure 1 Describe this specific embodiment, the test system of the small current grounding line selection device based on ADPSS described in this specific embodiment includes an ADPSS simulation system, a physical interface box and a power amplifier, and the ADPSS simulation system is used to build a system model and simulate faults , the test signal output end of the ADPSS simulation system is connected to the test signal input end of the power amplifier, and the test signal output end of the power amplifier is connected to the system under test through the physical interface box.

[0025] In this embodiment, the ADPSS simulation system builds a typical 35KV system distribution network line model for fault simulation, and performs fault tests on the corresponding protection devices, and compares and analyzes the performance of each protection device. The ADPSS system is an all-digital simulation system based on a high-perform...

specific Embodiment approach 2

[0026] Specific embodiment two, combine figure 1 and figure 2 Describe this specific embodiment, this specific embodiment is the test method of the test system of the small current grounding line selection device based on ADPSS described in specific embodiment one, and this method realizes by following steps:

[0027] Step 1. Build a system model through the ADPSS simulation system, simulate faults in each line area at the same time, and simulate real-time current and voltage through the model and faults;

[0028] Step 2. Input the simulated real-time current and voltage into the system model;

[0029] Step 3. In the system model, the infinite system supplies power to four lines through step-down transformers. Among them, Line 1 is an 8kM cable line, Line 2 is a 10kM overhead line, and Line 3 and Line 4 are both 10kM cable overhead hybrid lines ;

[0030] Step 4: The step-down transformer adopts non-grounding, grounding through arc suppressing coil or small resistance grou...

specific Embodiment approach 3

[0031] Embodiment three, the difference between this embodiment and the test method of the test system of the small current grounding line selection device based on ADPSS described in embodiment two is that the ADPSS simulation system simulates faults in each line area and includes:

[0032] 0%, 50%, and 100% metallic single-phase ground faults in each line area;

[0033] 0%, 50%, and 100% metallic two-phase phase-to-phase faults in each line area;

[0034] 0%, 50%, and 100% metallic two-phase grounding faults in each line area;

[0035] 0%, 50%, and 100% metallic three-phase phase-to-phase faults in each line area;

[0036] 0%, 50%, and 100% metallic three-phase ground faults in each line area;

[0037] 0%, 50%, and 100% of each line area are single-phase ground faults through transition resistance;

[0038] 0%, 50%, and 100% of each line area have two-phase phase-to-phase faults through transition resistance;

[0039] 0%, 50%, and 100% of each line area have two-phase gr...

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Abstract

The invention provides an ADPSS (advanced digital power system simulator) based test system for a low current grounding line selector and a test method of the system, relates to the field of low current grounding test and aims to guarantee reliable operation of a power supply system through fault test on the power supply system before the power supply system is put into use. The system comprises an ADPSS simulation system, a physical interface box and a power amplifier, wherein the ADPSS simulation system is used for building a system model and simulating faults, a test signal output end of the ADPSS simulation system is connected with a test signal input end of the power amplifier, and a test signal output end of the power amplifier is accessed to a to-be-tested system through the physical interface box. The ADPSS simulation system is used for building a typical 35KV system distribution network line model for fault simulation, the fault test is performed on corresponding protection devices, real-time current and voltage simulated through simulation can be directly input into the to-be-tested system, and accordingly, the dynamic detection for the to-be-tested system is realized.

Description

technical field [0001] The invention relates to the field of small current grounding test. Background technique [0002] Most distribution networks in my country adopt neutral point non-direct grounding system, that is, small current grounding system, which includes neutral point non-grounding system, neutral point grounding system through arc suppression coil, and neutral point grounding system through resistance. The biggest advantage of using a small current grounding system is that when a single-phase grounding fault occurs in the system, the symmetry of the system voltage is not destroyed, and the fault current is small, which will not cause great harm to the power supply equipment, allowing the faulty line or equipment to continue to operate For a period of time, the normal power supply will not be affected. However, if the single-phase ground fault is not dealt with in time, due to the increase of the two-phase-to-ground voltage of the non-faulty phase, the weak link...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00
Inventor 徐明宇徐冰亮董尔佳武国良于海洋陈晓光穆兴华姜鹏崔佳鹏关万林纪游
Owner STATE GRID CORP OF CHINA
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