Abstract
In order to prevent the power failure of the whole line caused by the maintenance of line switch, bypass switch is set in 220kV Main Wiring of some power plants. When the bypass replaces a line, there are three states in turn: line, bypass and line parallel operation, bypass operation. The bypass replacement logic of stability control device needs to correctly distinguish and switch these three states. This paper deeply studies the variation law of bypass, line analog and switching value in the whole bypass replacement process, puts forward the correct switching judgment method of line outage, trip and overload criteria, as well as the operation risk and prevention and control measures of bypass platen in the bypass replacement process, and then takes a power plant stability control device as an example to verify the results, which shows that the bypass replacement logic proposed in this paper is feasible. Risk prevention and control measures can ensure the correctness of logical discrimination of stability control devices in the process of bypass replacement, and can be extended to other power plant stability control devices.
Highlights
There are few outgoing lines in some power plants or substations in China
In order to ensure that the whole line does not need to be cut off when a line switch is cut off for maintenance, the bypass switch interval is increased
When a line switch is cut off for maintenance, the bypass switch is replaced by the line switch, and the whole line can continue to transmit power normally
Summary
There are few outgoing lines in some power plants or substations in China. In order to ensure that the whole line does not need to be cut off when a line switch is cut off for maintenance, the bypass switch interval is increased. In the process of line bypass, in order to ensure the stability control device to make accurate logical discrimination, it is necessary to use the correct line and bypass switch information, and specify the operation sequence of each bypass platen to prevent the operation risk. This paper deeply analyzes and studies the variation law of bypass, line analog and switching value in the whole line bypass switching operation process, puts forward the judgment method of line outage, trip and overload logic correct switching in each operation state, and puts forward the bypass risk identification and prevention and control measures, and takes a hydropower plant stability control device as an example to verify
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