One, microcomputer relay protection device site maintenance items include:
(1) Measure insulation
(2) Test the inverter
(3) Check whether the curing procedure is correct
(4) Test the accuracy and balance of the data acquisition system.
(5) Check the switching input and output loop
(6) Check the list of fixed values
(7) Whole group inspection
(8) Test with primary current and working voltage
According to the maximum and minimum impediments at each bus bar of the system, the linearity of the microcomputer relay protection device can meet the requirements of the system. Special attention should be paid to the relationship between the secondary resistance of the current converter, the current proportional coefficient and the linearity of the microcomputer relay protection device.
The instruments and meters used for inspection shall be managed by special personnel, and special attention shall be paid to moisture-proof and shock-proof, and the errors of instruments and meters shall be guaranteed within the specified range. Before use should be familiar with its performance and operation method, the use of advanced precision instruments generally should be monitored.
Ii. Design requirements:
(1) microcomputer relay protection device should have anti-electromagnetic disturbance ability.
(2) microcomputer relay protection device should be equipped with online automatic detection. In the microcomputer relay protection device in the microcomputer part of any damage should be issued when the device abnormal information, and when necessary, automatic locking corresponding protection. However, the design of the outlet circuit of the protection device should be simple and reliable, and it is not suitable to add components that may reduce the reliability in order to realize the complete self-inspection of the outlet circuit.
(3) All output terminals of microcomputer relay protection device should not be electrically connected with its weak current system.
(4) the microcomputer relay protection device should be equipped with self-recovery circuit. When the program dies due to interference, it should be able to work normally by self-recovery.
(5) the microcomputer relay protection device should not lose the report when the power supply is disconnected.
(6) microcomputer relay protection device should have timing function.
(7) For the same type of microcomputer relay protection device stop section should stipulate a unified setting symbol.
(8) The microcomputer relay protection device of 110Kv and above power system should have the function of measuring the distance of fault point.
(9) Star connection is recommended for current transformer used in microcomputer transformer protection device, and its phase compensation and current compensation coefficient are realized by software.
(10) Both ends of the same line should be configured with the same type of microcomputer high frequency protection.
(11) the same microcomputer relay protection device group screen scheme should not be too much.
