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Spared powder automatic switching device of direct current (DC) power supply

A technology of direct current power supply and standby self-switching, which is applied in the direction of circuit devices, emergency power supply arrangements, electrical components, etc., and can solve problems such as circuit breaker failure to operate normally, protection refusal to operate, and DC system power failure

Active Publication Date: 2013-02-27
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the battery pack with a long service life, the capacity drops seriously. During the discharge process, the capacity of the battery may drop instantaneously or the battery may be open. Loss of power
According to the "Safety Accident Investigation Regulations", it will cause a seven-level equipment incident accident
Once there is relay protection or circuit breaker action at this time, it will cause the protection to refuse to operate, the circuit breaker will not operate normally, and cause a greater accident

Method used

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  • Spared powder automatic switching device of direct current (DC) power supply

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Experimental program
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Embodiment Construction

[0012] A DC power backup self-injection device, including a box body, the normally open contacts of the DC contactors KM1 and KM2 are set on the positive and negative DC bus bars of the device, and the charger input end of the DC bus bar is provided with an indicator light L1. There is an indicator lamp L2 at the terminal of the discharge instrument of the busbar, and an ammeter is arranged on the positive busbar behind the normally open contact of the DC contactor KM2. The indicator light L2 is on during the discharge test, and the indicator light L2 is on when the battery pack is being charged, and is used to indicate the working state of the device.

[0013] The storage battery terminals of the device are connected in parallel to the positive and negative DC busbars between the normally open contacts of the DC contactor KM1 and the normally open contacts of the DC contactor KM2 through the DC air switch SW1, and the coil of the voltage relay DY is connected in parallel to th...

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Abstract

The invention discloses a spared powder automatic switching device of a direct current power supply and belongs to the technical field of measuring devices of storage batteries. According to the device, in a discharging test process of a storage battery, running positive and negative DC bus voltages are detected on line through a voltage relay, once the positive and negative DC bus voltages are lower than the normal running range, the voltage relay takes actions to start an intermediate relay ZJ, a normally closed contact ZJ1 arranged on the intermediate relay ZJ is opened, normally open contacts ZJ2, ZJ3 and ZJ4 are closed, a contact of a DC contactor KM2 is disconnected while an electric bell DL is started, a contact of a DC contactor KM1 is connected, instantaneous withdrawal of a discharge instrument and instantaneous switching of a portable charger are achieved, instantaneous switching of the portable charger when a DC system losses power in the discharging process of the storage battery can be achieved, and the DC system is prevented from power loss.

Description

technical field [0001] The invention relates to the technical field of storage battery measuring devices, in particular to a DC power supply self-injection device. Background technique [0002] Newly installed or long-term running battery packs in substations need regular checking charge and discharge tests, which are the only means to detect and restore the capacity of battery packs. The "Direct Current Power System Management Specification" stipulates that a newly installed valve-controlled battery pack should undergo a checking charge-discharge test, and then conduct an experiment every two years, and conduct a check-up charge-discharge test every year after 6 years. At present, the single battery substation accounts for 40% of all substations. When testing it, the charger needs to be taken out of operation. At this time, the DC load is powered by the battery pack without charging protection. [0003] For the battery pack with a long service life, the capacity drops seri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J9/06
Inventor 徐永卫王宏伟郑献刚田江波
Owner STATE GRID CORP OF CHINA
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