Program-control electronic load for relay protection

Abstract

The invention discloses a program-control electronic load for relay protection. The program-control electronic load comprises an upper computer, a controller, a field-effect tube set and a variable resistor. The upper computer sets variable resistance values, changes step parameter information and sends the parameter information. The controller is connected with the upper computer, receives the parameter information and generates control signals according to the parameter information. The field-effect tube set is connected with the controller and performs actions according to control signals. The variable resistor is connected with the field-effect tube set and adjusts the variable resistance of the resistance values according to the actions of the field-effect tube set. The program-control electronic load for relay protection can achieve automatic adjustment of the variable resistor and is small in step size adjustment and high in resistance value precision.

Description

technical field [0001] The invention relates to the technical field of electric power systems, and more specifically, relates to a program-controlled electronic load for relay protection. Background technique [0002] With the rapid development of the economy, the construction of the power grid has been intensified year by year, and several 110 kV substations have been newly put into operation every year, and nearly 100 sets of various types of protection devices have been added. The correct action of the protection device is related to the reliability of the power grid security. The regulations stipulate that a complete set of tests are required to be done during the inspection of newly installed protective devices, regular inspections of protective devices in operation, and supplementary inspections of protective devices in operation. Current, voltage, simulate fault conditions, and verify the combined action of protection devices and circuit breakers. The relay protecti...

AI Technical Summary

Problems solved by technology

At present, most of the variable loads on the market are mechanically adjustable, with large adjustment steps and low resistance accuracy, so they can only be manually switched to test multiple circuits.

However, electronic, small step size, high precision, and automatic jumper variable loads are rare on the market. Therefore, it is necessary to develop a special program-controlled electronic load for relay protection, which is used for the output accuracy and maximum power of relay protection testers. test

Images