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Comprehensive protection device for intelligent resonance resistant and resonance elimination PT (Potential Transformer) and protection method

A protection device and intelligent technology, applied in the field of harmonic elimination PT comprehensive protection device and intelligent resistance, to achieve the effect of suppressing low frequency resonance

Pending Publication Date: 2020-02-21
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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  • Description
  • Claims
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Problems solved by technology

These methods are based on different principles, each has its own strengths, and each has an irreplaceable role. They have been widely used in power systems, but they have also exposed their own shortcomings and problems in operation practice, and they have not been effectively integrated to achieve complementary advantages to form a complete system. s solution

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  • Comprehensive protection device for intelligent resonance resistant and resonance elimination PT (Potential Transformer) and protection method
  • Comprehensive protection device for intelligent resonance resistant and resonance elimination PT (Potential Transformer) and protection method
  • Comprehensive protection device for intelligent resonance resistant and resonance elimination PT (Potential Transformer) and protection method

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Embodiment Construction

[0033] In order to better understand the present invention, the present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0034] Such as figure 1 As shown, an intelligent anti-harmonic PT comprehensive protection device includes a signal conditioning unit, a micro-processing unit, a protection control unit, a status indication unit, a remote communication unit, an external storage unit, a power management unit, and a silicon carbide non-linear resistor;

[0035] Such as image 3 As shown, the protection control unit includes a vacuum switch, an intermediate relay, and a thyristor. The vacuum switch is connected to the thyristor through the intermediate relay, and the silicon carbide non-linear resistor is connected to the protection control unit.

[0036]The signal conditioning unit, the protection control unit, the state indication unit, the remote communication unit, the external storage unit and the power manageme...

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Abstract

The invention discloses a comprehensive protection device for an intelligent resonance resistant and resonance elimination PT (Potential Transformer) and a protection method, and relates to the technical field of resonance resistance and elimination and protection control of electromagnetic potential transformers. According to the invention, a vacuum switch is connected in parallel with a siliconcarbide nonlinear resistor at the primary side of an anti-saturation PT, and a silicon controlled rectifier is added to an open triangular loop at the secondary side, so that various PT faults such aslow-frequency resonance, PT inrush current and system resonance of the system can be suppressed quickly and effectively by a method of combining primary anti-resonance current limiting and secondaryresonance elimination.

Description

technical field [0001] The invention relates to the technical field of anti-harmonic elimination and protection control of electromagnetic voltage transformers, in particular to an intelligent anti-harmonic and anti-harmonic PT comprehensive protection device and a protection method thereof. Background technique [0002] In the 6~35kV system where the neutral point is not grounded, the electromagnetic voltage transformer (PT for short) used for insulation monitoring, its primary winding is connected in a star shape. The excitation impedance of the system and the ground capacitance of the system form a nonlinear resonant circuit. Due to the different circuit parameters and external excitation conditions, it may cause high frequency, power frequency, and frequency division resonance overvoltage, which will lead to frequent failures of PTs. For this reason, the relevant standards and specifications of the power system put forward clear requirements for the protection of PT, su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/05H02H9/02H02H7/26
CPCH02H7/05H02H7/262H02H9/02
Inventor 郭敏陈卫东金庆忍姚知洋
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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