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Grounding system for transformer neutral point resistance type direct current suppression device

A transformer neutral point and grounding system technology, which is applied to transformer/inductor circuits, circuit devices, DC network circuit devices, etc., can solve problems such as transformer DC bias, achieve convenient maintenance, simple and reliable schemes, and are suitable for popularization and application Effect

Inactive Publication Date: 2015-03-25
GUANGZHOU GOALAND ENERGY CONSERVATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When the HVDC power transmission system operates in a single-pole ground mode, there is a DC current flowing into the AC transformer from the ground through the directly grounded neutral point near the DC ground pole, causing the DC bias problem of the transformer.

Method used

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  • Grounding system for transformer neutral point resistance type direct current suppression device
  • Grounding system for transformer neutral point resistance type direct current suppression device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 As shown, a grounding system of a transformer neutral point resistive suppression device, including a transformer neutral point 1, a resistive suppression device 2, a ground switch 3, a suppression switch 4, a ground electrode 5 and a remote measurement and control unit 6 ,

[0028] The resistive straightening device 2 includes a resistor 7, a mechanical bypass switch 8, a thyristor valve 9, a reactor 10, a grounding copper bar 11, an incoming copper bar 12, an AC current transformer 13 and a DC current transformer 14;

[0029] The thyristor valve 9 is connected in series with the reactor 10 to form a fast bypass circuit, and the thyristor valve 9 is composed of a diode rectifier bridge 15 and a thyristor 16;

[0030] After the resistor 7, fast bypass circuit and mechanical bypass switch 8 are connected in parallel, one end is connected to the grounding copper bar 11, and the other end is connected to the incoming copper bar 12; the DC current transfor...

Embodiment 2

[0041] Such as figure 2 As shown, the anode of the thyristor 16 is connected to the positive pole of the DC side of the diode rectifier bridge 15, the cathode of the thyristor 16 is connected to the negative pole of the DC side of the diode rectifier bridge 15 through the reactor 10, and one end of the AC side of the diode rectifier bridge 15 is connected to the incoming line Copper medal 12 links to each other, and the other end links to each other with grounding copper medal 11, and all the other are the same as embodiment 1.

[0042] This system has the function of controlling the DC bias when the resistive straight suppression device 2 is put into operation and out of operation. In addition, it can monitor the DC current and the alternating current at the neutral point of the transformer to ensure the normal operation of the resistive straight suppression device 2 and In the case of maintenance, the power system monitoring network of the power grid company can simultaneou...

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Abstract

The invention discloses a grounding system for a transformer neutral point resistance type direct current suppression device. The grounding system comprises transformer neutral points, the resistance type direct current suppression device, grounding knife switches, direct current suppression knife switches, a grounding electrode and a remote measurement and control unit. The transformer neutral points are connected with the high-voltage sides of the grounding knife switches and the direct current suppression knife switches. The low-voltage sides of the grounding knife switches are connected with a grounding copper bar in the resistance type direct current suppression device through a primary cable, and the low-voltage sides of the direct current suppression knife switches are connected with a wire inlet copper bar in the resistance type direct current suppression device through a primary cable. The grounding copper bar is connected to the grounding electrode through a metal conductor. Signals acquired by a direct current transformer and an alternating current transformer are transmitted to the remote measurement and control unit through secondary cables, and the remote measurement and control unit is connected to an electric system monitoring network. The grounding system can achieve the direct current magnetic bias treatment and direct current and alternating current monitoring functions when the resistance type direct current suppression device is normally operated or overhauled, the scheme is simple and reliable, and the grounding system is convenient to maintain and suitable for application and popularization.

Description

technical field [0001] The invention relates to a grounding system of a transformer neutral point resistive direct suppression device, in particular to the monitoring of transformer neutral point direct current and alternating current and the treatment of transformer direct current bias. Background technique [0002] When the HVDC power transmission system operates in a single-pole ground mode, there is a DC current flowing into the AC transformer from the ground through the directly grounded neutral point near the DC ground pole, causing the DC bias problem of the transformer. The transformer neutral point resistive straight suppression device is composed of a resistor, a mechanical bypass switch and a fast bypass circuit in parallel, and is connected between the transformer neutral point and the ground. The mechanical bypass switch is in the closed position when there is no DC current flowing through the neutral point of the transformer. When it is detected that the DC cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/34H01F27/36H01F27/42H02J1/00
Inventor 黄克峰吴文伟蔡周宝王勇
Owner GUANGZHOU GOALAND ENERGY CONSERVATION TECH
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