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VFTO protection device and method for transformer in GIS substation

A protection device and transformer technology, applied in the field of substation, can solve the problems of indirect loss, discount of suppression effect, and high cost, and achieve the effects of wide application range, obvious steepness reduction, and convenient installation.

Inactive Publication Date: 2014-11-19
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
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Problems solved by technology

However, in actual GIS applications, the saturation effect of the ferrite magnetic ring will greatly reduce the suppression effect
[0007] In addition to their own defects, the above three commonly used methods all require hardware and structural changes to the equipment in the GIS, which requires large-scale and long-term power outage reconstruction of the substation, which is costly and indirect losses caused by power outages

Method used

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  • VFTO protection device and method for transformer in GIS substation
  • VFTO protection device and method for transformer in GIS substation
  • VFTO protection device and method for transformer in GIS substation

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Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] The VFTO protection device of the present invention is arranged between the line between the GIS equipment and the transformer in the GIS substation and the ground, and includes an arrester MOV, a capacitor C, a discharge coil L, a switch and a fuse FU. The series branch composed of fuse FU and capacitor C is connected in parallel at both ends of the arrester MOV, and the fuse FU is located between the line between the GIS equipment and the transformer and the capacitor C, that is, on the incoming line side of the capacitor; the arrester MOV The existing equipment of the substation is used to limit the amplitude of the overvoltage intruding into the transformer inlet; the capacitor C is used to limit the steepness of VFTO below the lightning wave; the fuse FU is used to protect the capacitor C on the one hand, and on the other h...

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Abstract

The invention provides a VFTO protection device and method for a transformer in a GIS substation. The protection device comprises a lightning arrester, a capacitor, a discharging coil, a switch and a fuse, a series connection branch circuit composed of the fuse and the capacitor is connected to the two ends of the lightning arrester in parallel, and the fuse is located between the capacitor and the circuit; a discharging branch circuit composed of the discharging coil and the switch in a series connection mode is connected to the two ends of the capacitor C in parallel. According to the protection method, parameters of the capacitor C are obtained through calculation of the principle of the circuit wave process. Through the VFTO protection device and method for the transformer in the GIS substation, the substation having been put into operation does not need to change too much, the VFTO amplitude and steepness can be effectively suppressed, longitudinal insulation of the transformer is protected, and the VFTO protection device is convenient to install and high in working reliability.

Description

technical field [0001] The invention relates to the technical field of power transformation, in particular to a device for protecting the VFTO of a transformer in a GIS substation. Background technique [0002] Gas Insulated Substation (GIS for short), also known as fully-enclosed combined electrical appliances, compared with air-insulated substations, it has many advantages such as small footprint, safe operation, convenient maintenance, and isolation from the surrounding environment, so gas-insulated substations It is used more and more widely all over the world, especially in distribution stations in metropolitan cities. During the closing process of the isolating switch and circuit breaker in the GIS, due to the repeated breakdown of the switch contact fracture, a very fast transient overvoltage (Very Fast Transient Overvoltage, referred to as VFTO) with an oscillation frequency of several hundred megahertz will be generated inside the gas-insulated substation. , the vo...

Claims

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Application Information

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IPC IPC(8): H02H9/04H02H7/16
Inventor 张重远王增超李春燕张欣
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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