Comprehensive test instrument of electric system primary cut out

Abstract

The invention is a high-voltage breaker synthetic tester for power system, combining operating program controller, high-power continuously adjustable DC power supply and minimum acting voltage tester of breaker together, and composed of master control board, high-power continuously adjustable DC power supply module, output control module, display and small keyboard, where the master control board is a MCU system composed of CPU and relative devices, responsible for control of the whole system work, the output control module has 4 I / O ports outputting control instruments to control switch-on and switch-off of the breaker switching-on and-off loop; the master control board controls 0-5V DC control voltage by a D / A converter in order to control output of 0-250V adjustable DC power supply, the output end of adjustable DC power supply is connected to the breaker switching-on and-off loop to act as a power supply of the loop; the master control board monitors the variation of the output DC voltage and the DC current in the output loop by an A / D converter.

Description

technical field [0001] The invention relates to a comprehensive tester for a high-voltage circuit breaker in a power system, in particular a conventional test instrument that meets the needs of preventive maintenance and handover tests of a high-voltage circuit breaker in a power system, and is mainly used for the minimum operating voltage of a high-voltage switch and the switching on and off Gate performance test. Background technique [0002] According to the requirements of the preventive test regulations for power equipment, generally after the high-voltage switch has been in operation for 1 to 3 years or after the overall overhaul of the switch or the overhaul of the mechanism, the operating voltage test of the switch opening and closing electromagnets must be performed. For SF 6 Circuit breakers and GIS, oil-rich circuit breakers and low-oil circuit breakers, air circuit breakers, vacuum circuit breakers and high-voltage switchgear, the minimum operating voltage on the...

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Problems solved by technology

[0006] The circuit breaker field test power supply is a continuously adjustable DC test power supply: it can output 0-250VDC continuously adjustable, stable, and isolated DC, and the output power requirements are high to meet the needs of field tests; the current high-voltage switch operating mechanism characteristic test The method used is to use a voltage divider to test, which has caused relatively large differences in China; the products of other domestic switch-operated power supply manufacturers are also based on the perspective of overhauling the power supply, which is quite different from the on-site demand; conventional high-voltage The switch operation power supply is mostly used for the operation power supply of the switch maintenance. The power supply has some problems at the same time, mainly because the load rate of the power supply is low, and the terminal voltage drops greatly when the load is on. It is not suitable for the handover test of the high-voltage switch on site. In some important even unusable

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