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Substation DC power supply state monitoring system and method

A condition monitoring system, a technology of DC power supply, applied in the direction of power supply testing, measuring electricity, measuring devices, etc., can solve the problems of inconvenient transportation, hidden dangers of safety accidents, etc.

Active Publication Date: 2017-11-24
国网黑龙江省电力有限公司佳木斯供电公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of inconvenient transportation and on-site monitoring by personnel, the present invention solves the problem that the battery can only be disengaged from the system capacity check experiment when it reaches a certain service life in the detection of the existing DC system of the substation, and there is a relatively large hidden danger of safety accidents question

Method used

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  • Substation DC power supply state monitoring system and method
  • Substation DC power supply state monitoring system and method
  • Substation DC power supply state monitoring system and method

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0041] Substation DC power supply status monitoring system, including main controller, mains detection circuit, discharge meter-battery pack switching control circuit, battery temperature acquisition circuit, several charging equalization circuits and several internal resistance measurement modules;

[0042] Such as figure 1 As shown, the main controller U3 is a single-chip microcomputer model C8051F500, with built-in 64K program memory, built-in 12-bit AD converter and 8-way AD input interface; The speed can reach 50MIPS, the chip has the advantages of strong anti-interference ability and large program storage space;

[0043] Such as figure 2 As shown, in the mains detection circuit, the mains N and L are respectively connected to pins 4 and 5 of the coil winding of the relay Relay, and pin 2 of the relay is connected to pin 32 of the main controller U3. pin (P2.2); when the mains power supply is normal, the mains detection pin 2 and GND pin 1 are disconnected, and the cor...

specific Embodiment approach 2

[0054] The substation DC power supply status monitoring system described in this embodiment further includes a battery voltage detection circuit connected to pin 33 (P2.1) and pin 34 (P2.0) of the main controller U3.

[0055] Other structures and parameters are the same as those in the first embodiment.

[0056] When the substation DC power supply state monitoring system is equipped with a battery voltage detection circuit and an internal resistance measurement module circuit, the internal resistance can be measured and the voltage can be measured at the same time. Measuring the internal resistance requires voltage and current, so the voltage is also obtained when the internal resistance is obtained.

specific Embodiment approach 3

[0057] The substation DC power supply status monitoring system described in this embodiment also includes a current transformer, the current transformer measures the charge and discharge current on the battery cable, and the output of the current transformer directly enters the No. 26 pin of the main controller U3 ( P3.0) for collection and processing.

[0058] Other structures and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to a power supply state monitoring system and method, in particular to a substation DC power supply state monitoring system and method, and is intended to solve the problem that system capacity verification test can be carried out to detect an existing substation DC system only after a battery is removed and after the system is used for a certain time, the problem that transporting is inconvenient, the problem that field monitoring by personnel is required, and the problem that great potential safety hazards exist. The system comprises a master controller, a mains supply detection circuit for detecting whether mains supply is lost, a discharge device-battery pack switching control circuit for switching a discharge device and a battery pack according to the loss condition of the mains supply, a battery temperature acquisition circuit for detecting operating temperature of a battery, a charging balance circuit for controlling charging of the battery, and an internal resistance measuring module for detecting internal resistance of the battery. The system and method of the invention are suitable for monitoring substation DC power supply state.

Description

technical field [0001] The invention relates to a power state monitoring system and method. Background technique [0002] The DC system plays a vital role in the substation. It provides stable and reliable power for the signal, protection, automatic device, emergency lighting, circuit breaker and other equipment of the substation. Therefore, the performance and stability of the DC system have a great impact on the safety of the substation. Running plays an important role. The DC system is almost always composed of battery packs composed of dozens of single batteries connected in series / parallel. Usually the battery pack works in the charging state, and it is charged by the charger 24 hours a day. In the event of loss of mains power, the storage battery immediately puts into operation to provide power for all DC equipment in the substation. Therefore, the reliability of the battery plays a vital role in the DC system. The performance of the single battery is very importan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/40G01R31/36
CPCG01R31/382G01R31/40
Inventor 王洪涛张国庆徐福峰李军李家彬李铁
Owner 国网黑龙江省电力有限公司佳木斯供电公司
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