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Overvoltage suppression resistor and selection method of suppression resistor for live access high-voltage bus inspection device

A technology for suppressing resistance and testing devices, applied to non-adjustable liquid resistors, resistors, measuring devices, etc., can solve problems such as calibration accuracy, achieve the effects of eliminating arcs, suppressing transient overvoltages, and simplifying structures

Active Publication Date: 2015-09-02
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the on-site transformers are generally in operation, and it is generally difficult to perform power outages to calibrate the accuracy

Method used

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  • Overvoltage suppression resistor and selection method of suppression resistor for live access high-voltage bus inspection device

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Experimental program
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Effect test

Embodiment 1

[0023] a kind of like figure 1 The overvoltage suppression resistor of the live-connected high-voltage bus inspection device shown above includes an insulating tube 1, a conductive liquid 2 contained in the insulating tube, and 3 metal electrodes are movably connected to both ends of the insulating tube. The electrodes communicate with the inner and outer spaces of the insulating tube, and a sealing device 4 is provided between the metal electrode and the insulating tube to prevent the conductive liquid from overflowing between the two. The sealing device is a sealing ring. The conductive liquid is water. The resistance of the water is selected at 50 ohms. Described water is formed by mixing tap water and distilled water. The diameter of the insulating tube is 1-3 cm. The insulating tube may be a tempered glass tube.

[0024] The length of the insulating tube is generally 15-20cm for the 110kV class, and 20-30cm for the 220kV class.

[0025] The parts not described in th...

Embodiment 2

[0027] The selection method of the suppressing resistance of the live access high-voltage bus inspection device firstly ensures that the measurement circuit of the live access high-voltage bus inspection device is in an over-damped state, and the voltage waveform on the standard capacitor in the measurement circuit is a non-oscillating index Waveform, there is basically no overshoot phenomenon. Secondly, it is necessary to avoid the resistance value of the suppression resistor being too high. If the resistance value is too high, the transient discharge time will be prolonged, which will cause the voltage on the suppression resistor to act for too long, making the surface of the resistor prone to flashover. , can not achieve the proper damping suppression transient effect, the selection range of the suppression resistance value is within Between, where, L is the equivalent inductance in the loop, and C is the equivalent capacitance of the capacitor.

[0028] When the standard ...

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Abstract

The invention discloses an over-voltage suppressing resistor of a live power-on high voltage bus checking device and the selecting method of the suppressing resistor. The suppressing resistor comprises an insulation tube and a conducting liquid, wherein the conducting liquid is contained inside the insulation tube; metal electrodes are movably connected to two ends of the insulation tube; the inner and outer spaces of the insulation tube are communicated through the electrodes; and a sealing device for preventing the conducting liquid from overflowing out of the metal electrodes and the insulation tube is arranged between the metal electrodes and the insulation tube. With the adoption of the suppressing resistor and the selecting method of the suppressing resistor, the effect of electric arc extinguishment is achieved well; and only slight arc light is generated at the moment of power-on and power-off. The transient state action time is short (1-2 microseconds); the transient state voltage generated at the moment of power-on and power-off causes no damping outside surface flashover; the appearance size and the weight of a damping resistor are reduced greatly; the space is saved; the structure is greatly simplified; and the cost is reduced.

Description

technical field [0001] The invention relates to a test device for live access to a high-voltage bus, in particular to an overvoltage suppression resistor and a selection method for the test device for live connection to a high-voltage bus. Background technique [0002] In the application of field high-voltage test, measurement verification and insulation monitoring, it is sometimes necessary to provide accurate bus voltage phase and amplitude parameters, which can be used to accurately determine the insulation status of equipment. However, the transformers used in the field usually increase the error of the transformer due to various reasons such as accuracy level, load, and performance aging, which affects the measurement accuracy. Existing transformer accuracy inspections require power outage detection, which cannot achieve live calibration, resulting in the inability to evaluate the accuracy of the secondary voltage of the transformer in time. If the error is large, it ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C11/00G01R35/02
Inventor 吴文宣廖福旺李强黄海鲲游浩刘松喜吕龙平王宁燕其他发明人请求不公开姓名
Owner STATE GRID CORP OF CHINA
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