Automatic test system of dc circuit breaker characteristic parameter

An automatic test system, DC circuit breaker technology, applied in the direction of circuit breaker testing, etc., can solve the problems that the short-circuit current time constant cannot be adjusted, the waveform parameters cannot be measured, and the current range is small, so as to achieve light weight, high reliability, high safety effect

Inactive Publication Date: 2009-08-19
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] A switching power supply is used as a DC current source, and the maximum output current can reach 1000A, but the maximum output voltage is only 5V, so it can only carry out the overload ampere-second characteristic test due to the capacity limit
[0007] In the above schemes, the

Method used

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  • Automatic test system of dc circuit breaker characteristic parameter
  • Automatic test system of dc circuit breaker characteristic parameter
  • Automatic test system of dc circuit breaker characteristic parameter

Examples

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Embodiment Construction

[0019] figure 1 It shows that after the three-phase (or single-phase) AC voltage is rectified and filtered, a smooth DC voltage is supplied to the inverter circuit.

[0020] The inverter circuit is mainly composed of high-power IGBT modules to form a full-bridge conversion circuit. When the PWM output control signal drives the power modules separately through the isolation driver, the two pairs of switch tubes are turned on alternately, and a high-frequency pulse voltage is generated at the primary stage of the high-frequency transformer. The stage voltage is transformed by a high-frequency transformer and then rectified to output energy to the load.

[0021] The output terminals are respectively connected with feedback loops such as voltage stabilization, voltage limiting, and current limiting. When an abnormal situation (such as input overvoltage or undervoltage, overcurrent or overheating, etc.) generates a protection signal to the protection circuit, the protection circuit...

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PUM

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Abstract

The invention discloses an automatic testing system of characteristic parameters of a direct-current breaker, which consists essentially of an analyzing and managing system controlled by a computer, a digital storage oscillograph and a program-controllable direct-current power source. 12-bit digital values that are output by a single chip microcomputer output 0 to 5V voltage through a digital-to-analog converting circuit, and the voltage is output to a phase-shifting-control full-bridge zero-voltage switching and a pulse modulation converting circuit through an isolating amplifier as well as to an EA+ end of a main chip, thus changing output current. The electromagnetic tripping action time is measured by a waveform breaking method and taking the largest constant short-circuit current in electromagnetic instantaneous acting tripping as the starting point of timing, thus having the advantages of high accuracy, efficiency and reliability.

Description

technical field [0001] The invention relates to the automatic test of electric power engineering, the test of the protective action characteristic of the source of the tested DC circuit breaker and the verification of the level difference coordination of the DC power supply system. Background technique [0002] Due to the difference in protective action characteristics of different manufacturers or different series of DC circuit breakers of the same manufacturer, many leapfrog tripping accidents have been caused, causing voltage loss in the DC system of the whole station, and even causing vicious accidents in the power grid system. Therefore, it is extremely important to test and verify the protection and coordination characteristics of DC circuit breakers to prevent accident expansion and equipment damage. In order to accurately analyze the protection and coordination problems in the current substation DC system, it is necessary to carry out the short-circuit protection cha...

Claims

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Application Information

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IPC IPC(8): G01R31/327
Inventor 李晶陈贤顺胡灿曹永兴丁丹一
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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