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Method for detecting partial discharge of ring main unit based on coupling capacitance technology

A technology of coupling capacitance and partial discharge, which is applied in the detection field of ring network cabinets, can solve the problems that partial discharge signals are difficult to be transparently transmitted and difficult to be detected, and achieve the effect of solving the difficulty of partial discharge detection

Pending Publication Date: 2021-12-03
南京尚华电力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a detection method for the partial discharge of the ring network cabinet based on the coupling capacitor technology, which solves the problem that the ring network The internal partial discharge signal is not easy to be transparently transmitted, and it is difficult to be detected

Method used

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  • Method for detecting partial discharge of ring main unit based on coupling capacitance technology
  • Method for detecting partial discharge of ring main unit based on coupling capacitance technology
  • Method for detecting partial discharge of ring main unit based on coupling capacitance technology

Examples

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Embodiment 1

[0037] Specifically for low frequency voltage detection, such as figure 1 As shown, the voltage measured on site is 10-100V, and under normal circumstances: the capacitor voltage divider ratio = V 主 / V 次 ≈1000 / 1, capacitor capacitance ratio = capacitor voltage divider ratio = C 主 / C 次 ≈1 / 1000, capacitance calculation: C=εS / 4πKd, εdielectric constant is related to the insulation performance of the material, and the reference value of the dielectric constant is: epoxy resin: 3-4, air: 1.00585, water: 70-80 .

Embodiment 2

[0039] Specifically for high-frequency pulse detection, such as figure 2 and image 3 as shown, figure 2 The middle figure b is the equivalent circuit of figure a, which is a parallel circuit of inductance and capacitance. When the circuit resonates, a higher resonance voltage is generated at both ends of Ct and Lm. Once the measurement circuit is determined, the resonance capacitance of the measurement circuit will be It can be obtained, and the measurement center frequency f0 of the measurement system is also known, so as long as the measurement impedance and inductance value Lm is properly selected, a sufficiently high measurement sensitivity can be achieved. The high-frequency pulse detection method is used to measure partial discharge. There are usually three basic test circuits: parallel test circuit, series test circuit and balance circuit, such as image 3 As shown, where Cx: represents the capacitance of the test object, Zm: represents the detection impedance, Ck:...

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Abstract

The invention discloses a method for detectingpartial discharge of a ring main unit based on a coupling capacitance technology. The method comprises the steps: carrying out low-frequency voltage detection and high-frequency pulse detection, connecting an oscilloscope with a three-phase nuclear phase hole in the outer surface of a ring main unit, starting the oscilloscope, reading the numbers of the oscilloscope, detecting the AC voltage of the three-phase nuclear phase hole, inserting a coupling sensor matched with the partial discharge impedance and the frequency into the three-phase nuclear phase hole in the outer surface of the ring main unit, and observing whether discharge signals exist in the three-phase nuclear phase hole or not through the oscilloscope matched with the coupling sensor matched with the partial discharge impedance and the frequency. The three-phase nuclear phase hole is formed in the outer surface of the ring main unit and is connected with equipment in the ring main unit through a coupling capacitor, when partial discharge occurs in the ring main unit, signals can be coupled to the coupling capacitor, the coupling capacitor is connected with the nuclear phase hole, the nuclear phase hole is detected through an instrument, frequency coupling is conducted on partial discharge signals, the partial discharge condition in the cabinet can be detected, and the problem that partial discharge of the ring main unit is difficult to detect is solved.

Description

technical field [0001] The invention belongs to the technical field of ring network cabinet detection, and in particular relates to a method for detecting partial discharge of a ring network cabinet based on coupling capacitor technology. Background technique [0002] The ring network cabinet is a set of high-voltage switchgear installed in a metal or non-metal insulated cabinet or made into an assembled spaced ring network power supply unit. Its core part uses load switches and fuses. It has simple structure, small size, and low price Low, can improve power supply parameters and performance, and power supply security and other advantages. It is widely used in distribution stations and box-type substations of load centers such as urban residential quarters, high-rise buildings, large public buildings, factories and enterprises. [0003] Partial discharge live detection of power equipment is already an effective means of preventing electrical equipment insulation defects in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/12G01R31/1263
Inventor 赵培伟庞强胡兵金加元
Owner 南京尚华电力科技有限公司