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

A voltage transformer and electromagnetic technology, which is applied in the field of secondary AC harmonic elimination devices, can solve the problems such as the influence of the normal operation of relay protection, and achieve the effects of improving safety and stability, simple structure and improving reliability.

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

AI Technical Summary

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 alternating-current resonance elimination device used for electromagnetic type voltage transformer

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Embodiment Construction

[0012] Such as figure 1 As shown, the secondary AC resonance elimination device used in the electromagnetic voltage transformer in this embodiment includes a full-control switch unit 1 and a discharge resistor 2, and the full-control switch unit 1 and the discharge resistor 2 are connected in series with the electromagnetic voltage transformer The two ends a of the open delta winding 3 of the device are connected to form a loop; the full-control switch unit 1 is composed of two full-control switch devices connected in antiparallel.

[0013] Such as figure 1 As shown, the electromagnetic voltage transformer is composed of a three-phase primary winding 4, a three-phase secondary winding 5 and an open delta winding 3. The neutral point n is directly grounded, and the full control switch unit 1 and the discharge resistor 2 are connected in series to form a loop with the two ends a of the open delta winding 3 of the electromagnetic voltage transformer.

[0014] In this embodiment...

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Abstract

The invention discloses a secondary alternating-current resonance elimination device used for an electromagnetic type voltage transformer. The device comprises a fully-controlled switch unit (1) and a discharging resistor (2), and the fully-controlled switch unit (1) and the discharging resistor (2) are connected with the two ends of an open delta winding (3) of the electromagnetic type voltage transformer after being connected in series to form a circuit; the fully-controlled switch unit (1) is composed of two fully-controlled switch devices reversely connected in parallel; each 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 secondary alternating-current resonance elimination device is simple in structure, 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.

Description

technical field [0001] The invention relates to the technical field of harmonic elimination for voltage transformers, in particular to a secondary AC harmonic elimination device for electromagnetic voltage transformers. 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 ferroma...

Claims

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Application Information

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IPC IPC(8): H02H9/04
Inventor 张坤李光星刘桢刘鑫周滨
Owner STATE GRID CORP OF CHINA
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