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Secondary direct-current resonance elimination device used for electromagnetic type voltage transformer

A voltage transformer, secondary DC technology, applied in emergency protection circuit devices, inductors, circuit devices, etc. used to limit overcurrent/overvoltage, can solve problems such as the influence of normal operation of relay protection, and improve safety. Effects of stability, suppression of ferromagnetic resonance overvoltage, and improved reliability

Inactive Publication Date: 2015-02-25
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can better suppress the ferromagnetic resonance of the voltage transformer, it also brings certain negative effects to the system. The normal operation will also be affected, etc.

Method used

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  • Secondary direct-current resonance elimination device used for electromagnetic type voltage transformer

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Embodiment Construction

[0014] Such as figure 1 As shown, the secondary DC resonance elimination device used in the electromagnetic voltage transformer in this embodiment includes a rectifier circuit 1, a full-control switching device 3 and a discharge resistor 4, and the two connection terminals a on the AC side of the rectifier circuit 1 are connected to the electromagnetic voltage The two connection ends b of the open triangle winding 7 of the transformer are connected, and the two connection ends c of the DC side of the rectifier circuit 1, the full-control switching device 3 and the discharge resistor 4 are connected in series to form a loop.

[0015] Such as figure 1 As shown, the electromagnetic voltage transformer is composed of a three-phase primary winding 5, a three-phase secondary winding 6 and an open delta winding 7. The neutral point n of the rectifier circuit 1 is directly grounded; the two connection terminals a of the AC side of the rectifier circuit 1 are connected to the two conn...

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Abstract

The invention discloses a secondary direct-current resonance elimination device used for an electromagnetic type voltage transformer. The device comprises a rectifier circuit, a fully-controlled switch device and a discharging resistor. The alternating-current side connection end of the rectifier circuit is connected with the connection end of an open delta winding of the electromagnetic type voltage transformer, and the direct-current side connection end of the rectifier circuit, the fully-controlled switch device and the discharging resistor are connected in series to form a circuit; the fully-controlled switch device is one of an insulated gate bipolar transistor (IGBT), an integrated gate commutated thyristor (IGCT) and a gate turn-off thyristor (GTO); the rectifier circuit is a single-phase uncontrolled rectifier bridge composed of four rectifier diodes. The secondary direct-current resonance elimination device can quickly and effectively suppress ferromagnetic resonance overvoltage generated by the electromagnetic type voltage transformer and does not influence normal and asymmetric operation modes of a system, and accordingly safety and stability of power system operation are effectively improved and the structure is simple.

Description

technical field [0001] The invention relates to a voltage transformer harmonic elimination technology, in particular to a secondary direct current harmonic elimination device for an electromagnetic voltage transformer. Background technique [0002] In the neutral point ungrounded distribution network system, in order to monitor the three-phase-to-ground voltage of the system, perform electricity metering or protection, the electromagnetic voltage transformer installed on the bus usually adopts Y0 / Y0 / open delta connection mode, and the primary winding is connected into Star, the neutral point is directly grounded. However, when the single-phase arc grounding automatically disappears in the line, the bus switch closing operation or the system load changes drastically, the resulting transient impact process will excite iron between the electromagnetic voltage transformer and the three-phase wire-to-ground capacitance. Magnetic resonance phenomenon. The phenomenon of ferromag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04H01F38/24H01F27/34
Inventor 张坤刘鑫周滨李继陟石艳
Owner STATE GRID CORP OF CHINA
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