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Overvoltage on-line sampler for 6-35 KV electric power system

A sampling device and power system technology, applied in emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, measuring current/voltage, etc., can solve transient waveform deformities and make it difficult to analyze the exact cause of accidents , equipment insulation level reduction and other issues

Inactive Publication Date: 2005-02-23
席世友
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  • Abstract
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Problems solved by technology

This is because the operating system does not have an online (simultaneously operating with the system) monitoring device that can record the accident wave process in real time when the overvoltage occurs, and it is difficult to analyze the exact cause of the accident (because the amplitude or steepness of the overvoltage exceeds the tolerance of the equipment ability, or the insulation level of the equipment is reduced, or there is a problem with the protection device), put forward preventive measures
[0003] The existing on-line fault recorder in the power system uses a voltage transformer as a sensor. Because the time response of the voltage transformer is long, usually above 20 milliseconds, and because the voltage is transformed by electromagnetic induction, the transient waveform obtained is deformed. Therefore, it is only suitable for sampling of system steady-state overvoltage accidents

Method used

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  • Overvoltage on-line sampler for 6-35 KV electric power system
  • Overvoltage on-line sampler for 6-35 KV electric power system
  • Overvoltage on-line sampler for 6-35 KV electric power system

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Embodiment Construction

[0012] See attached figure 1 , 2 , in the embodiment, the high-voltage arm includes a high-voltage capacitor C1, a damping resistor R1 and an insulating outer sheath 1, and the low-voltage arm includes a low-voltage capacitor C2, a low-voltage damping resistor R2, a protection gap g, a voltage-dividing output terminal cable connection column J and a metal shielding shell Body 2; the insulating outer sheath of the high voltage arm is a silicone rubber outer sheath, and its creepage distance is not less than 21mm / kv. Several capacitors are coaxially connected in parallel, the surface is coated with an insulating paint layer, and they are installed in a metal shielding shell. A protection gap, that is, a neon tube, is connected in parallel to the low-voltage capacitor of the low-voltage arm. When the low-voltage arm capacitor is overvoltage for some reason, the protection gap The discharge plays a protective role; the output end of the voltage divider is connected to the cable c...

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Abstract

An on-line sampling device consists of high voltage arm including high voltage capacity, buffer resistance and insulation outer protective sheath; and low voltage arm including low voltage capacity, protective gap, subvoltage output end and metal shielded outer sheath. It has response characteristic below 15-100 nanosecond and can catch overvoltage signal in transient state with sampling voltage of 3-35kv.

Description

Technical field [0001] The invention relates to an online monitoring device for power system operation, and the monitoring object is overvoltage. technical background [0002] The voltage exceeding the rated voltage of electrical equipment during the operation of the power system (due to lightning strikes or circuit switching) is called overvoltage. When overvoltage occurs during operation, the equipment will be damaged and cause a power outage. In order to prevent overvoltage damage to the equipment, overvoltage protection devices such as lightning arresters are installed. However, a large number of surge arresters and other overvoltage protection devices are installed in the 6-35KV system, and the overvoltage accident rate (damage to high-voltage equipment such as transformers or causing power outages) is still relatively high. So far, the research on the problem is only at the level of theory and laboratory simulation research, and there is no case corresponding to the a...

Claims

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Application Information

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IPC IPC(8): G01R19/165H02H9/04
Inventor 席世友孙财新
Owner 席世友
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