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Internal temperature on-line testing method of zinc oxide lightning protector with high-voltage capacitors connected in parallel

A technology of high-voltage capacitors and detection methods, which is applied to thermometers, thermometers, and voltage/current isolation of directly heat-sensitive electric/magnetic components, and can solve problems such as explosions and large amounts of zinc oxide arresters

Inactive Publication Date: 2010-02-24
曲娜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The distribution network is widely distributed, and the amount of zinc oxide arresters is huge. Its performance is directly related to the reliability of power supply. The current zinc oxide arresters often explode due to leakage current and internal damp discharge during operation.

Method used

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  • Internal temperature on-line testing method of zinc oxide lightning protector with high-voltage capacitors connected in parallel
  • Internal temperature on-line testing method of zinc oxide lightning protector with high-voltage capacitors connected in parallel

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Experimental program
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Embodiment Construction

[0012] combine figure 1 , figure 2 Best practice is given.

[0013] combine figure 1 Given the embedded structure of the PTC resistance in the arrester:

[0014] Install the zinc oxide valve piece in the improved fixed zinc oxide valve piece sleeve 1 in a modular manner, squeeze the zinc oxide valve piece into the space on the side with a smaller radius, squeeze it tightly, and use it at the side slot 2 The heat-conducting potting compound is used for potting. After the potting is completed, a PTC resistor 3 is embedded on the surface of the potting compound, and the lead wire 4 of the resistor is drawn out from the bottom of the arrester. At the same time, a 0.1 microfarad high-voltage capacitors, and silicone rubber one-shot die-casting for this internal composition.

[0015] combine figure 2 Give the circuit that converts the temperature to an optical signal, and finally to an electrical signal:

[0016] The resistance lead wire 6 forms a loop with the luminous tube...

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Abstract

The invention discloses an internal temperature on-line testing method of a zinc oxide lightning protector with 6-35 KV high-voltage capacitors connected in parallel, which uses a thermistor PTC embedded into the lightning protector to measure the heating condition of a valve plate inside the zinc oxide lightning protector, thereby judging the running condition of the zinc oxide valve plate. The method comprises the improvement on the structure of a sleeve inside the zinc oxide lightning protector and comprises the following steps: making a groove on one side of the sleeve; after installing the valve plate, pouring heat-conducting potting adhesive into the groove, embedding a PTC resistor into the surface of the adhesive, leading the wire of the resistor out from the bottommost part of thelightning protector, and meanwhile, connecting high-voltage capacitors in parallel on the exterior of the sleeve and the zinc oxide valve plate to improve the performance of the zinc oxide lightningprotector; and after the potting adhesive is dried, carrying out die casting. For the leading-out wire of each PTC resistor, a 5V / 5V isolation transformer, a rectification circuit and a light emittingdiode constitute a loop; when the PTC resistor senses a temperature change, the resistance value changes, thus, the current flowing through the loop changes, and the light intensity of the light emitting diode changes; the light signal is transmitted to a central processor through an optical cable and restored into an electric signal through a photosensitive tube to complete the photoelectric isolation and collect the heating condition inside the lightning protector.

Description

Technical field: [0001] The invention discloses an online detection scheme for a 6-35KV zinc oxide arrester. The thermistor PTC buried inside the arrester is used to measure the heating condition of the valve plate inside the zinc oxide arrester, thereby judging the operation of the zinc oxide A 0.1 microfarad high-voltage capacitor is connected in parallel outside the zinc sleeve to improve the characteristics of the zinc oxide arrester when it is subjected to overvoltage. The invention belongs to the field of online detection of the arrester. Background technique: [0002] The distribution network is widely distributed, and the amount of zinc oxide arresters is huge. Its performance is directly related to the reliability of power supply. The current zinc oxide arresters often explode due to leakage current and internal damp discharge during operation. For the safety of the power grid, it is necessary to conduct on-line inspection of the lightning arrester of the distributi...

Claims

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Application Information

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IPC IPC(8): G01K7/22G01R15/22
Inventor 曲娜
Owner 曲娜
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