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Method and device for monitoring running state of transforming station direct current system

A DC system and operating state technology, applied in the field of electrical measurement, can solve the problems of not being able to measure or monitor the bus voltage ripple voltage and its variation range, and achieve the effects of saving purchase, reducing quantity and improving safety

Inactive Publication Date: 2008-12-03
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The existing monitoring methods for the power supply quality of the DC system can only monitor the magnitude or level of the bus voltage, but cannot measure or monitor the ripple voltage and its variation range in the bus voltage

Method used

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  • Method and device for monitoring running state of transforming station direct current system
  • Method and device for monitoring running state of transforming station direct current system
  • Method and device for monitoring running state of transforming station direct current system

Examples

Experimental program
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Effect test

Embodiment

[0089] The battery capacity of the communication battery of C substation was generally insufficient when it was discharged on March 6, 2007. The test data is shown in the following table:

[0090]

[0091]

[0092] From the test data, the capacity of the 9 bottles of batteries has been discharged after half an hour of discharge, and the voltage of the other batteries has been lower than 1.97V, so the battery capacity is lower than 80%, and the whole set of batteries needs to be replaced.

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Abstract

The invention provides a monitoring method for the running state of a substation DC system, belonging to the measurement field. The monitoring method comprises the following steps of: detecting the bus voltage of the DC system, and comparing and outputting the overvoltage / undervoltage alarm signal; the DC component of the bus voltage is detected, meanwhile, the AC component Uac of the bus voltage is also detected by a DC block; the absolute value of the Uac' and the set value Uac'' are compared; if the absolute value of the Uac' is more than the Uac', the control unit outputs a ripple voltage over-limit alarming signal. The invention also provides a monitoring device used for monitoring the running state of the DC system. The monitoring method and the monitoring device realize the dual monitoring function on the DC system, have an effect of dual-use with one machine, provide more effectively ensuring for the safe and stable running of the DC system, reduce the number of the monitoring device, are beneficial to saving the cost of purchase and running and the maintenance workload of the system, and can be widely used for the field of the measurement, monitoring and safe running of the running state of the transformation and distribution DC system.

Description

technical field [0001] The invention belongs to the field of electrical measurement, and in particular relates to a method and device for measuring and monitoring the running state of a DC system in a substation. Background technique [0002] The operation, control, protection, signal and automatic devices of various electrical equipment in power plants and substations (stations) all need reliable power supply. Because this kind of power supply is particularly important, it is generally specially set up, and it is usually called Operating power. [0003] Large and medium-sized power plants and substations (stations) mainly use DC operating power supply (also referred to as DC system). [0004] The DC system is an important equipment system of power plants and substations (stations), which must ensure uninterrupted power supply under normal operation and accident conditions, and meet the requirements of voltage quality and power supply capacity. [0005] DC system accidents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J13/00H02J1/00G01R19/165G01R31/08G08B21/00
CPCY04S20/18Y02B90/228Y02B90/20
Inventor 戴春怡
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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