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Self-adaptive overload protection action method for overhead transmission lines

An overhead transmission line, overload protection technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of conservative and single settings, and achieve the effect of improving reliability and ensuring safe operation.

Active Publication Date: 2016-02-10
TSINGHUA UNIV +2
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of conservative and single setting of the traditional overload protection setting value, and propose an action method for adaptive overload protection of overhead transmission lines. The time product replaces the maximum allowable temperature as the thermal limit of the line to realize the adaptive overload protection of overhead transmission lines. Gain time for the implementation of system security and stability control measures

Method used

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  • Self-adaptive overload protection action method for overhead transmission lines
  • Self-adaptive overload protection action method for overhead transmission lines
  • Self-adaptive overload protection action method for overhead transmission lines

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Embodiment Construction

[0020] An adaptive overload protection action method for overhead transmission lines proposed by the present invention is described in detail as follows in conjunction with the accompanying drawings and embodiments.

[0021] The embodiment flow of the adaptive overload protection action method for overhead transmission lines proposed by the present invention is as follows: figure 1 As shown, this embodiment sets the line emergency thermal setting C max =6k°C·min, limit temperature judgment value T L =120°C, emergency temperature judgment value T E =70℃, warning temperature judgment value T W =60°C, the initial flag of the emergency flag is 0, the method includes the following steps:

[0022] Step 1) According to the current maximum temperature T along the overhead transmission line and substation collected max value, judge T max Whether the value reaches the limit temperature judgment value T L =120℃, if T max >120℃, then step 6), if T max ≤120℃, then go to step 2);

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Abstract

The invention relates to a self-adaptive overload protection action method for overhead transmission lines, and belongs to the technical field of electric power system protection and control. In the method, whether ultimate temperature, emergency temperature or warning temperature is reached is judged according to maximum line temperature obtained according to the collection of the overhead transmission lines and transformer substations; when the maximum line temperature exceeds the ultimate temperature, the lines are cut off immediately; when the maximum line temperature exceeds the emergency temperature and is lower than the ultimate temperature, time-temperature product is accumulated in real time, and if the time-temperature product exceeds line emergency thermal rating, export tripping is performed through self-adaptive overload protection; and when the maximum line temperature exceeds the warning temperature and is lower than the emergency temperature, a pre-warning report is sent to a dispatching center. The method disclosed by the invention can overcome the defect that traditional overload protection setting value is conserved and single in setting by taking full advantage of the maximum line temperature of the transmission lines obtained through collection and calculation, so that the reliability of overload protection is improved, and safe operation of the lines is guaranteed to the maximum extent.

Description

technical field [0001] The invention belongs to the technical field of power system protection and control, in particular to an adaptive overload protection action method for overhead power transmission lines. Background technique [0002] The unreasonable tripping of relay protection under overload is an important reason to promote chain tripping, which poses a serious threat to the safety of the power grid. From the point of view of system safety, unreasonable tripping of relay protection under accident overload should be avoided as much as possible. However, allowing the line to run under overload without taking any action may affect the safe operation of the line and cause damage to electrical equipment. From the perspective of electrical equipment safety, this situation should also be avoided. [0003] Therefore, the action criteria of the relay protection in the line overload state should be clearly defined: under the premise that the line is overloaded rather than a...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 董新洲曹润彬施慎行倪江雷傲宇陈昕
Owner TSINGHUA UNIV
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