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Method for judging safe closing operation of medium voltage distribution network

A determination method and power grid technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of not considering the load distribution of the distribution network and limited practical value.

Active Publication Date: 2018-10-26
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a certain theoretical basis, but because it does not consider the actual load distribution in the distribution network, the result of the loop closure decision will be relatively conservative, and its practical value is limited.

Method used

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  • Method for judging safe closing operation of medium voltage distribution network
  • Method for judging safe closing operation of medium voltage distribution network
  • Method for judging safe closing operation of medium voltage distribution network

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Embodiment Construction

[0066] based on the following Figure 1 ~ Figure 3 , specifically explain the preferred embodiment of the present invention.

[0067] Such as figure 1 As shown, the present invention provides a method for judging the safe loop closing operation of the medium-voltage distribution network, which includes the following steps:

[0068] Step S1. Calculate the effective value of the loop-closing steady-state current at the head end of the feeder after loop-closing, and determine whether the upper limit of the loop-closing steady-state current effective value is greater than the maximum allowable current carrying capacity of the feeder. If it is, proceed to step S2; if not, allow the loop-closing operation ;

[0069] Step S2. Determine whether the probability of exceeding the limit of the maximum steady-state current effective value at the head end of the feeders on both sides after the loop is closed is less than 5%. If yes, the loop closing operation is allowed; if not, the loop ...

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Abstract

The invention discloses a method for judging the safe closing operation of a medium voltage distribution network. The method comprises the following steps: calculating a closing steady-state current valid value of a feeder head after closing; judging whether the upper limit of the closing steady-state current valid value is larger than the maximum allowable feeder current carrying capacity or not;if not, allowing the closing operation; if so, continuously judging whether the limit exceeding probability of the maximum steady-state current valid values of the feeder heads on both sides less than 5 percent or not after closing; if so, performing the closing operation; and if not, not allowing the closing operation. The decision-making time required by the method is short; a judgment result is more accurate; the safety and timeliness in practical application are taken into account; and operators are assisted in making safe and fast decisions for the closing operation of the medium voltagedistribution network.

Description

technical field [0001] The invention relates to the field of safe and stable operation of electric power systems, in particular to a method for judging the safe loop closing operation of a medium-voltage distribution network. Background technique [0002] At present, my country's medium-voltage distribution network generally adopts the power supply mode of closed-loop design and open-loop operation. During equipment maintenance or emergency handling, the loop-closing operation of the closed contact switch can be used to transfer loads without power failure, so as to reduce power outage time and improve power supply reliability. Due to the voltage difference between the two sides of the break of the contact switch, the ring closing operation may generate a large transient impact current and steady state circulating current, causing current protection action or overloading of some electrical equipment, resulting in ring closing failure and even large-scale power outages . The...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 冯楠周自强张焰冯煜尧崔勇杨永华朱齐
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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