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A same-frequency and same-phase withstand voltage test device with safe sampling signals

A withstand voltage test device, the technology of the same frequency and the same phase, applied in the field of electric power, can solve problems such as potential safety hazards, and achieve the effect of protecting safety

Active Publication Date: 2019-03-01
STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the reference voltage selection of the same-frequency and same-phase AC withstand voltage test technology is directly selected from the secondary side of the PT, and then directly connected to the reference signal input port of the control box of the same-frequency and same-phase test device, without any conversion or protection components in between. great security risk

Method used

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  • A same-frequency and same-phase withstand voltage test device with safe sampling signals
  • A same-frequency and same-phase withstand voltage test device with safe sampling signals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The GIS same-frequency and same-phase AC withstand voltage test device provided in this embodiment adopts the operating voltage of adjacent equipment (such as the secondary side voltage of the bus voltage transformer) as the reference voltage, obtains the test voltage through resonance, and uses the phase-locked loop technology Real-time dynamic tracking of its frequency and phase, so that the frequency and phase of the test voltage and the operating voltage are in the same frequency and phase state, and the same frequency and phase GIS AC withstand voltage wiring on site is as follows: figure 1 As shown in the figure, the same-frequency and same-phase withstand voltage test device with safe sampling signals provided in this embodiment includes a same-frequency and same-phase test power supply 1, a series resonant device 2, a voltage divider 3, an AC power supply 4, and a conversion Isolation device 6 and control box 5;

[0022] The AC power supply is connected with the...

Embodiment 2

[0027] The isolation conversion device provided in this embodiment adopts optical fiber as the transmission medium of the PT secondary voltage signal isolation sampling device, including a signal transmitting unit and a signal receiving unit; the signal transmitting unit transmits the signal to the signal receiving unit through the optical fiber.

[0028] The signal sending unit includes a step-down circuit, a level shift circuit, a first VFC voltage-frequency converter, a photoelectric transmitter and a first power supply circuit;

[0029] The input end of the step-down circuit is used to receive the PT secondary signal input by the PT; the output end of the step-down circuit is connected to the input end of the level shift circuit; the output end of the level shift circuit is connected to the first The input terminal of a VFC voltage-frequency converter is connected; the output terminal of the first VFC voltage-frequency converter is connected with the photoelectric transmitt...

Embodiment 3

[0042] The isolation conversion device provided in this embodiment adopts an isolation transformer; the PT secondary voltage signal is obtained through the isolation transformer, including a PT voltage transformer, an isolation transformer and a control box;

[0043] The PT voltage transformer is connected to the bus for obtaining the PT secondary voltage signal;

[0044] The PT secondary voltage signal is input to the input side of the isolation transformer; the output side of the isolation transformer is connected to the control box.

[0045] The input side of the isolation transformer is provided with a fuse for preventing short circuit of the terminals of the isolation transformer.

[0046] The output side of the isolation transformer is provided with a fuse for preventing short circuit of the terminals of the isolation transformer.

[0047] The input side of the isolation transformer is provided with a 3-core socket connected to the input port.

[0048] The output side ...

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Abstract

The invention discloses a same-frequency same-phase voltage withstanding test device with safety sampling signals.The device comprises a same-frequency same-phase test power source, a series resonance device, a voltage divider, an alternating current power source, a conversion isolation device and a control box.The same-frequency same-phase test power source is connected with the voltage divider through the series resonance device; the voltage divider is connected with a to-be-tested interval Cx connected to a busbar; the conversion isolation device is arranged between the control box and a voltage transformer PT; the control box is connected with the same-frequency same-phase test power source.The conversion isolation device is arranged at a reference voltage selected from the secondary side of the PT to protect the safety of acquired reference signals, and the accident that the PT is damaged due to the fact that a short circuit occurs to the secondary side of a busbar or outgoing line PT in electrified operation is avoided.Electrical isolation between a sampling PT of reference signals input in the GIS same-frequency same-phase alternating current voltage withstanding test control device and a scene signal sampling PT is achieved, and transmission of abnormal signals between the reference signal sampling PT and the test device is cut off.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a same-frequency and same-phase voltage withstand test device with safe sampling signals. Background technique [0002] Gas-insulated metal-enclosed switchgear (hereinafter referred to as GIS) after interval expansion and maintenance (especially double-bus connection GIS), all need to carry out AC withstand voltage test in the case of partial power failure. The GIS expansion bay or dismantling maintenance bay is only disconnected from the adjacent operating part through the isolating switch. If the operating part is not powered off, the test voltage and the operating voltage may be reversely superimposed on the isolating switch fracture during the AC withstand voltage, resulting in breakdown of the isolating fracture and endangering the operating equipment. Therefore, DL / T555, DL / T 617, DL / T Standards such as 618 stipulate that the adjacent equipment should be powered of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G01R31/327G01R1/36
CPCG01R1/36G01R31/1254G01R31/327
Inventor 李龙王谦吴高林何国军侯兴哲葛凯龙英凯王勇籍勇亮吴彬胡晓锐
Owner STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST
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