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Device for online monitoring running state of transformer substation grounding grid

A substation grounding network and operating status technology, which is applied in the direction of grounding resistance measurement, etc., can solve the problems of large error and inaccurate measurement

Inactive Publication Date: 2014-01-08
STATE GRID CORP OF CHINA +1
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  • Claims
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Problems solved by technology

At present, the method usually used in China is to measure the grounding network regularly, understand the change of grounding resistance in a certain period of time, and then take measures according to the measurement situation. Although the above method is simple, there are problems such as inaccurate measurement and large errors, and So far, there is still no dedicated facility for monitoring and evaluating the status of the substation grounding grid

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  • Device for online monitoring running state of transformer substation grounding grid

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Embodiment Construction

[0013] Below in conjunction with accompanying drawing and embodiment, further elaborate the present invention. In the following detailed description, certain exemplary embodiments of the invention are described by way of illustration only. Needless to say, those skilled in the art would realize that the described embodiments can be modified in various different ways, all without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0014] Such as figure 1 As shown, an on-line monitoring device for the operation status of the substation grounding grid includes a central processing unit, the input end of the central processing unit is connected to a power module, and the output end of the central processing unit is connected in series with an oscillator and a power amplifier. The output end of the power amplifier is connected with a power-taking dev...

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Abstract

The invention discloses a device for online monitoring a running state of a transformer substation grounding grid. The device comprises a CPU (Central Processing Unit), a power supply module, an oscillator and a power amplifier, wherein an output end of the power amplifier is connected with an electricity taking device, the electricity taking device is connected to a grounding down lead, the electricity taking device is connected with the CPU through an A / D (Analog / Digital) converter, a measuring coil is connected between the electricity taking device and the A / D converter, an output end of the CPU is connected with a remote substation server through a communication module, circuit on resistance of the grounding down lead can be detected through the measuring coil and the electricity taking device and can be transmitted to the remote substation server through the communication module, and safety evaluation of the state of a grounding grid can be obtained. According to the device disclosed by the invention, the state of the transformer substation grounding grid can be subjected to online remote monitoring through the remote substation server; direct guidance can be provided for the running maintenance of the transformer substation grounding grid according to a monitoring evaluation result; the device has no negative effects on an original device of an electric power system.

Description

technical field [0001] The invention relates to an electric power monitoring device, in particular to an online monitoring device for the operation status of a substation grounding grid. Background technique [0002] To understand the change of substation grounding resistance, the best way is to regularly measure the grounding resistance. Regarding the grounding resistance of substation lightning protection equipment, it is generally not greater than 10 ohms in the "Preventive Test Regulations for Power Equipment" DL / T596-2005. It is not enough to take the total grounding resistance of 10 ohms if two grounding electrodes are connected in parallel, so it is stipulated that the grounding resistance of each grounding electrode must be below 50 ohms when it exists alone. The inflow of small lightning current causes secondary discharge. [0003] Reducing the grounding resistance of substations is the main measure to improve the level of lightning protection. In actual operation...

Claims

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Application Information

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IPC IPC(8): G01R27/20
Inventor 李振华李磊崔国栋孙金祥王振泉曹立杰周阳
Owner STATE GRID CORP OF CHINA
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