35KV power distribution station internal and external over voltage monitoring method based on voltage mutual inductor sample

Abstract

The invention relates to a method for monitoring the internal and external overvoltage in a power distribution station based on the sample of a voltage transformer, which comprises the following steps: (1) each phrase voltage signal is collected by the voltage transformer; (2) each phrase voltage signal is sent into a digital signal processor as a sample voltage signal after signal conditioning, photoelectric isolation, and the processing by a analog-to-digital converter and a data buffer, and the digital signal processor can continuously process each phrase sample voltage signal at the sample point to obtain each phrase voltage sample value of each sample point; (3) the digital signal processor can make the comparison between each phrase voltage sample value and the preset voltage reference value and judge that whether the internal and external overvoltage exist or not; each phrase voltage sample value is sent into the storage area of the digital signal processor, the voltage signal is uploaded by a communication interface, and an upper computer records the waveform and the parameter of the transient overvoltage, monitors all the internal and external overvoltage generated in a power system, and records the generation process of the overvoltage on line completely and precisely. The method of the invention has the advantages of safety and practicality, as well as rather less equipment investment.

Description

technical field

[0001] The invention and a method for monitoring internal and external overvoltages of a 35KV power distribution station based on voltage transformer sampling belong to the online overvoltage monitoring technology. Background technique

[0002] Overvoltage on-line monitoring is the application of on-line monitoring technology in the power field. Acquisition of overvoltage signals is the key to overvoltage on-line monitoring technology. Usually, the equipment that can be used to obtain overvoltage signals includes: voltage transformer, high voltage divider and optical fiber voltage sensor. Among them, high voltage divider is used more often. device to obtain the overvoltage signal. The structural block diagram of a traditional overvoltage monitoring system using a high voltage divider is shown in figure 1 As shown, after the system bus voltage is reduced to an appropriate voltage level by the high-voltage divider, the isolation sensor performs high-speed and...

Examples

Embodiment Construction

[0021] See figure 2 As shown, the present invention is based on the 35KV substation internal and external overvoltage monitoring method of voltage transformer sampling. voltage signal. In the low frequency state, such as power frequency, the steady-state amplitude-frequency response and transient amplitude-frequency response of the voltage transformer are both linear, and they have good overvoltage signal transmission capabilities. The transformer coil will generate electrostatic induction between the coils under the action of impulse voltage such as operating impulse voltage and lightning impulse voltage. At this time, the transmission of voltage is mainly based on electrostatic induction. Compressor to transmit high-frequency impulse voltage signals, such as image 3 As shown, it is a simplified equivalent circuit of the electrostatic induction of the transformer under the high-frequency state of the present invention. It can be seen that it mainly depends on the ground c...

technical field

[0001] The invention and a method for monitoring internal and external overvoltages of a 35KV power distribution station based on voltage transformer sampling belong to the online overvoltage monitoring technology. Background technique

[0002] Overvoltage on-line monitoring is the application of on-line monitoring technology in the power field. Acquisition of overvoltage signals is the key to overvoltage on-line monitoring technology. Usually, the equipment that can be used to obtain overvoltage signals includes: voltage transformer, high voltage divider and optical fiber voltage sensor. Among them, high voltage divider is used more often. device to obtain the overvoltage signal. The structural block diagram of a traditional overvoltage monitoring system using a high voltage divider is shown in figure 1 As shown, after the system bus voltage is reduced to an appropriate voltage level by the high-voltage divider, the isolation sensor performs high-speed and...

Examples

Embodiment Construction

[0021] See figure 2 As shown, the present invention is based on the 35KV substation internal and external overvoltage monitoring method of voltage transformer sampling. voltage signal. In the low frequency state, such as power frequency, the steady-state amplitude-frequency response and transient amplitude-frequency response of the voltage transformer are both linear, and they have good overvoltage signal transmission capabilities. The transformer coil will generate electrostatic induction between the coils under the action of impulse voltage such as operating impulse voltage and lightning impulse voltage. At this time, the transmission of voltage is mainly based on electrostatic induction. Compressor to transmit high-frequency impulse voltage signals, such as image 3 As shown, it is a simplified equivalent circuit of the electrostatic induction of the transformer under the high-frequency state of the present invention. It can be seen that it mainly depends on the ground c...

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