35kv substation overvoltage on-line monitoring device
A monitoring device and overvoltage technology, applied in the field of monitoring, can solve the problems of low sampling frequency, inability to collect lightning overvoltage and operating overvoltage signals, etc., and achieve the effect of solving the storage depth
Inactive Publication Date: 2017-01-04
孙文兵
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Problems solved by technology
[0003] The existing voltage monitoring relies on the fault recorder in the substation. Because the sampling frequency of the fault recorder in the substation is low, it is used for the monitoring of power frequency voltage signals, but it cannot collect lightning overvoltages with frequencies as high as megahertz. and operating overvoltage signal
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[0014] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0015] Such as figure 1 As shown, a 35kV substation overvoltage online monitoring device is composed of a voltage divider unit, an acquisition unit, an industrial computer and a background monitoring center; the overvoltage signal is connected to the voltage divider unit through a high voltage lead wire, and the high voltage is converted The low voltage that the acquisition unit can accept, the isolation and attenuation circuit performs secondary voltage division and signal conditioning, the high-speed data acquisition card performs analog-to-digital conversion into digital signals, and the industrial computer stores the data in the hard disk after packaging and processing, and transmits the data through the internal data network of the power grid. The data is sent to the background monitoring center, and the monitoring center...
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The invention provides a 35kV substation overvoltage on-line monitoring device which is formed by a voltage dividing unit, a collection unit, an industrial control machine, and a background monitoring center. An overvoltage signal is connected to the voltage dividing unit via a high voltage lead, high voltage is converted into low voltage which can be received by the collection unit. An isolation attenuation circuit carries out secondary voltage dividing and signal conditioning. A high speed data collection card carries out analog to digital conversion to form a digital signal. The industrial control machine packages data and then stores the data into a hard disk, and sends the data to the background monitoring center through a grid internal data network. The monitoring center can receive the overvoltage data from a monitoring site in real time and carries out data analyzing and according to a protocol. According to the device of the invention, a reference is provided for substation insulation coordination and overvoltage prevention and control, and a data basis is established for the mode identification of overvoltage and the development of fault diagnosis.
Description
technical field [0001] The invention belongs to the technical field of monitoring, and in particular relates to an on-line monitoring device for overvoltage in a 35kV substation. Background technique [0002] In the actual operation of the power grid, power system accidents are mainly caused by insulation damage of electrical equipment, and overvoltage is the main cause of insulation damage; accurate grasp of overvoltage data in the power system during operation can provide guidance for insulation coordination and overvoltage protection measures. It provides a reliable basis for the adoption of the fault and provides effective data for the analysis of the cause of the fault; therefore, it has important practical significance to monitor the overvoltage of the substation equipment. [0003] The existing voltage monitoring relies on the fault recorder in the substation. Because the sampling frequency of the fault recorder in the substation is low, it is used for the monitoring ...
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Login to View More IPC IPC(8): G01R19/165
CPCG01R19/16576
Inventor 孙文兵
Owner 孙文兵