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Secondary neutral point multipoint grounding monitoring deivce of voltage transformer of transformer substation

A voltage transformer, multi-point grounding technology, applied in the direction of measuring devices, instruments, measuring electricity, etc., can solve the problems of unattended, current value judgment, hidden dangers of safe operation of power grids, etc., to save time and labor. Effect

Inactive Publication Date: 2013-07-17
李社勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this invention can't judge the current value, and give an alarm to the current exceeding the set value, so it can't meet the requirement of unattended; and this invention can't remember and store the short-lived multi-point grounding event, for The safe operation of the power grid has left hidden dangers

Method used

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  • Secondary neutral point multipoint grounding monitoring deivce of voltage transformer of transformer substation
  • Secondary neutral point multipoint grounding monitoring deivce of voltage transformer of transformer substation
  • Secondary neutral point multipoint grounding monitoring deivce of voltage transformer of transformer substation

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Embodiment Construction

[0016] The overall structure of the device is as follows figure 2 As shown, it mainly consists of the MCU central processing module and the power processing module, A / D conversion module, storage data module, clock signal control module, LCD display module, alarm circuit, 485 communication module and other parts connected to the MCU central processing module. frame diagram.

[0017] image 3 , 4 , 5, 6, and 7 are schematic diagrams of the functional pins between the chips selected by each part in the specific embodiment of the present invention and the components used therein.

[0018] image 3 Power supply module, 220V AC power supply through JXD2.5-0505-WFCIE outputs two voltages: 5V / 0.1A, 5V / 0.4A, one is filtered by C1, E1, L1, L2, C14, C15, R30, etc. After circuit processing, it provides working voltage for MCU central processing module, A / D conversion module, storage data module, clock signal control module, LCD display module and alarm circuit; the other circuit pro...

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Abstract

A secondary neutral point multipoint grounding monitoring deivce of a voltage transformer of a transformer substation comprises a one-point grounding loop connected with a secondary neutral point of the voltage transformer, wherein a single-turn through current sensor is connected onto the one-point grounding loop. The secondary neutral point multipoint grounding monitoring deivce is characterized in that an analog / digital (A / D) data conversion module is connected onto a current sensing coil; the output end of the A / D data conversion module is connected into a micro-programmed control unit (MCU) microprocessor; and an alarming circuit, an internal memory, a communication module, a power supply processing module, a liquid crystal display (LCD) module, a key operation module and a time clock signal control module are connected onto the MCU microprocessor. Compared with the prior art, the secondary neutral point multipoint grounding monitoring deivce can store current values, give alarms and transmit the current values to a remote monitoring platform when the current values surpass the preset value by monitoring and judging secondary neutral current. In addition, compared with the traditional monitoring method, unattended operation is achieved, and a large amount of time and labor force wasted in the existing monitoring process is saved.

Description

technical field [0001] The invention relates to a secondary neutral point multi-point grounding monitoring device for a voltage transformer of a substation, and belongs to the technical field of electric power system relay protection. Background technique [0002] In this case, a 500kV substation is taken as an example. When the secondary neutral point (N600) of the voltage transformer of the 500kV substation is grounded at multiple points, a line short-circuit fault occurs, and the fault current flows in the ground network to form a voltage, which is superimposed into two The sub-neutral point will cause the phase voltage sensed by the relay protection device to be distorted, causing the relay protection device to refuse to operate or malfunction, resulting in a power grid accident. The invention patent with application number 201120254560.1 is a simple secondary neutral point multi-point grounding monitoring device. It is constructed as figure 1 As shown, including the p...

Claims

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Application Information

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IPC IPC(8): G01R31/02G01R19/25
Inventor 李社勇张中明申洲
Owner 李社勇
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