Direct-current circuit breaker on-off characteristic test method

A technology for DC circuit breaker and characteristic testing, applied in circuit breaker testing and other directions, can solve problems such as inability to conduct test verification, maintenance and maintenance personnel not having testing methods and tools, and hidden dangers of safe operation of power systems.

Inactive Publication Date: 2013-12-04
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the DC power supply systems of power plants and substations can basically be designed in accordance with relevant standards to ensure 2 to 4 steps. Corresponding testing methods and tools cannot be tested and verified, which leaves hidden dangers to the safe operation of the power system

Method used

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  • Direct-current circuit breaker on-off characteristic test method
  • Direct-current circuit breaker on-off characteristic test method

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Embodiment Construction

[0011] like figure 1 As shown, a method for testing the on-off characteristics of a DC circuit breaker is composed of an upper management computer and a test module for the on-off characteristics of a DC circuit breaker connected through RS485 communication. The on-off characteristic test device of the DC circuit breaker is composed of two parts: the upper management computer and the on-off characteristic test module of the DC circuit breaker. The upper management machine adopts high-performance industrial computer, Windows XP operating system, keyboard, touch panel input (USB mouse can be connected externally), simple operation, beautiful interface, all parameters are clear at a glance; real-time display of various parameter curves and values, and can store multiple groups Test data and waveforms to realize functions such as electronic archiving, report printing, and record query. The upper management machine is a computer installed with the on-off characteristic test softwa...

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Abstract

The invention discloses a direct-current circuit breaker on-off characteristic test method, and relates to the technical field of direct-current circuit breaker on-off characteristic test. The method relates to an upper supervisory computer, and the upper supervisory computer is in RS485 communication connection with a direct-current circuit breaker on-off characteristic test module; the direct-current circuit breaker on-off characteristic test module is composed of a data collection unit, a control and regulation unit and a test power module; the data collection unit comprises a current diverter, a storage record body, a microprocessor, a keyboard and a display device; the control and regulation unit comprises a telecontrol relay, a time relay, an emergency stop button, a direct-current contactor, parallel resistors R1...Rn, IGBTs K1...Kn and an optocoupler; the test power module comprises an AC/DC rectifier module and a super-capacitor. The direct-current circuit breaker on-off characteristic test method has the advantages that releasing time of a circuit breaker can be tested under different short-circuit currents, dispersity and internal resistance inconsistence and unreasonable stage difference coordination of the circuit breaker in a direct-current system and other hidden dangers of the direct-current system can be found timely, and possible operation rejection and misoperation of the direct-current circuit breaker are effectively avoided.

Description

technical field [0001] The invention relates to the technical field of testing the on-off characteristics of a DC circuit breaker, in particular to a novel method for testing the on-off characteristics of a DC circuit breaker. Background technique [0002] In the power system, the DC power supply system is used as a power source for relay protection, automatic devices, control operation circuits, lighting and audio signals, and accident lighting, and is the basic guarantee for the correct operation of relay protection, automatic devices and circuit breakers. Due to the large power supply content and wide distribution of the DC system of the substation, there are often many branches in a DC network that need to be protected by circuit breakers or fuses, and are often divided into three to four stages in series. During the operation of the DC system, When a short-circuit fault occurs in the lower-level electrical equipment, it often causes the leapfrog tripping of the upper-le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327
Inventor 王浩徐敦彬李建军王敏刘豪杰张利胡凯袁田单小勇马建辉
Owner STATE GRID CORP OF CHINA
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