Partial discharge on-site calibration method for high-voltage cable line GIS terminal

A partial discharge and high-voltage cable technology, applied in the direction of measuring electrical variables, measuring devices, instruments, etc., can solve problems such as poor accuracy, and achieve the effect of simple operation and convenient field application

Active Publication Date: 2016-10-26
STATE GRID TIANJIN ELECTRIC POWER +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the actual test process, the numerical unit obtained by live detection is usually mV, which cannot be directly converted into pC of partial discharge, and cannot directly reflect the severity of partial discharge. Instead, it can only be judged by multiple measurements and trend changes. poor accuracy

Method used

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  • Partial discharge on-site calibration method for high-voltage cable line GIS terminal
  • Partial discharge on-site calibration method for high-voltage cable line GIS terminal
  • Partial discharge on-site calibration method for high-voltage cable line GIS terminal

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Embodiment Construction

[0021] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0022] A kind of on-the-spot calibration method for partial discharge of high-voltage cable line GIS terminal, such as Figure 1 to Figure 3 shown, including the following steps:

[0023] Step 1. Press figure 1 As shown, connect the outgoing line of the GIS terminal cable of the high-voltage cable line to the first isolating switch (-2), the circuit breaker, and the second isolating switch (-4) to the bus in sequence, and the common connection between the circuit breaker and the first isolating switch (-2) The point is grounded through the first grounding switch (-27), the common point of the circuit breaker and the second isolating switch (-4) is grounded through the second grounding switch (-47), and the outgoing line of the cable passes through the fast grounding switch (-17 ), and the field ground connection piece is grounded.

[0024] Step ...

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Abstract

The invention relates to a partial discharge on-site calibration method for a high-voltage cable line GIS terminal, and the technical characteristics of the method are that the method comprises the following steps: switching off a circuit breaker, a first disconnecting switch and a second disconnecting switch, and switching on a first grounding knife switch and a second knife switch; switching on a rapid grounding knife switch, and switching off an external grounding connection piece of the rapid grounding knife switch; enabling a partial discharge standard pulse generator to be connected to the external grounding connection piece of the rapid grounding knife switch; enabling a high-frequency current sensor to be clamped on a protection layer grounding line of a GIS terminal direct grounding box; connecting the high-frequency current sensor and a partial discharge measurement device through a coaxial signal line; transmitting a standard partial discharge pulse pC through the partial discharge standard pulse generator, measuring a detection value mV of the partial discharge measurement device, and achieving the on-site calibration of the partial discharge of the GIS terminal. The method is reasonable in design, achieves the on-site calibration function of the partial discharge of the GIS terminal, is high in accuracy, is simple in operation, and is convenient to use.

Description

technical field [0001] The invention belongs to the technical field of partial discharge detection of high-voltage cable lines, in particular to an on-site calibration method for partial discharge of high-voltage cable line GIS terminals. Background technique [0002] 110kV and above voltage level high-voltage cable lines mainly include cable body and cable accessories, among which cable accessories (including cable terminals and intermediate joints) are the weak links of high-voltage short cable lines, especially the quality problems of the accessories themselves and the on-site construction process. Insulation defects are the main cause of cable line failures. According to statistics, more than 95% of cable line faults are caused by cable accessories. For running high-voltage cable lines, high-frequency current partial discharge live detection is an effective method to detect insulation hazards. By installing a high-frequency current sensor on the connecting piece of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00
CPCG01R35/00
Inventor 周凤争孟庆霖朱晓辉张东斐孟峥峥唐庆华王浩鸣李旭朱明正宋鹏先
Owner STATE GRID TIANJIN ELECTRIC POWER
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