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Online monitoring and pre-warning protection method and system for high-voltage switch cabinet

A high-voltage switchgear and protection system technology, applied in the field of electric power equipment, can solve problems such as failure of the busbar, early warning of contact temperature rise, etc., and achieve the effect of ensuring the safety of power supply

Inactive Publication Date: 2017-11-10
江苏尚坤电能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an on-line monitoring and early warning protection method and system for high-voltage switchgear to solve the technical problem that the existing high-voltage switchgear cannot provide early warning for the rise of busbar and contact temperature

Method used

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  • Online monitoring and pre-warning protection method and system for high-voltage switch cabinet
  • Online monitoring and pre-warning protection method and system for high-voltage switch cabinet
  • Online monitoring and pre-warning protection method and system for high-voltage switch cabinet

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Embodiment 1

[0047] Such as figure 1 As shown, the present invention proposes an on-line monitoring and early warning protection method for a high-voltage switchgear. Specifically, the method includes the following steps:

[0048] S101. Collect and store the temperature data of each busbar or contact of the high-voltage switchgear in real time, and transmit it to the monitoring server;

[0049] S102. The monitoring server receives the temperature data, generates a temperature curve within a preset time period for each of the bus bars or the contacts, and performs wavelet packet transform denoising processing on the temperature curve;

[0050] S103. According to the temperature curve after the denoising treatment, obtain a non-equally spaced temperature sequence of each of the bus bars or the contacts within a preset time period;

[0051] S104. Construct a second-order differential equation for predicting temperature, use the non-equally spaced temperature sequence to fit the second-order...

Embodiment 2

[0099] Based on the same inventive idea, such as image 3 , 4 As shown, the present invention also provides a high-voltage switchgear online monitoring and early warning protection system, including a data acquisition device 20, a communication device 30, and a monitoring server 60. The data acquisition device 20 is arranged in each high-voltage switchgear 10, It is used to collect bus bar or contact temperature data in the high-voltage switchgear 10 in real time; the communication device 30 is used to transmit the temperature data of the bus bar or the contact to the monitoring server 60, and the monitoring server 60 receives and processes the temperature data of the bus bars or the contacts, predicts the predicted temperature of each bus bar or the contacts after a preset time, and sends out an alarm prompt.

[0100] Wherein, the high-voltage switchgear on-line monitoring and early warning protection system also includes an electromagnetic line cutting device 40, and the el...

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Abstract

The invention discloses an online monitoring and pre-warning protection method and system for a high-voltage switch cabinet. The method comprises the following steps of collecting and storing temperature data of each busbar or contact of the high-voltage switch cabinet and transmitting the temperature data to a monitoring controller; receiving the temperature data by the monitoring server, generating a temperature curve of each busbar or contact within a preset time period, and carrying out wavelet packet transform denoising on the temperature curve; obtaining an unequal interval temperature sequence of each busbar or contact within the preset time period according to the denoised temperature curve; establishing a second-order difference equation for predicting temperature, fitting the second-order difference equation through utilization of the unequal interval temperature sequence, calculating a coefficient of the second-order difference equation through a least square principle, thereby obtaining a temperature prediction formula of each contact or busbar; and obtaining a predicted temperature value of each busbar or contact after preset time according to the temperature prediction formula, and when the predicted temperature value is greater than an alarm threshold value, generating alarm prompt.

Description

technical field [0001] The invention relates to the technical field of electric power equipment, in particular to an on-line monitoring and early warning protection method and system for a high-voltage switchgear. Background technique [0002] High-voltage switchgear is the main control and protection equipment in the substation system, which plays a vital role in the safe and reliable operation of the power system. The commonly used trolley switchgear and the circuit breaker are connected by plugs of dynamic and static contacts. When the dynamic and static contacts are in contact, there is a contact resistance between them. When the current flows through the contacts, the It will cause heating of the contacts, so the national standard stipulates the maximum allowable heating temperature and allowable temperature rise of the contacts. During normal operation, the temperature rise of the dynamic and static contacts will not exceed the specified range. However, due to poor ma...

Claims

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Application Information

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IPC IPC(8): H02H1/00H02H7/22H02H5/04G01K11/32G01K11/3206
CPCH02H1/0007H02H1/0092H02H5/04H02H7/22G01K11/32
Inventor 杜永刚俞春华
Owner 江苏尚坤电能科技有限公司
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