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Storage battery discharging instrument and discharging current regulating method thereof

A discharge current and battery technology, applied in the field of discharge current regulation and battery discharger, can solve the problems of increased labor intensity, inaccurate measurement, performance degradation, etc., to improve accuracy and precision, avoid large errors, control The effect of circuit simplification

Active Publication Date: 2014-08-27
LUOHE POWER SUPPLY OF HENAN ELECTRIC POWER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 220kV substation and some 110kV substations use two sets of batteries. When the batteries are inspected, the two sets of DC systems must be connected in parallel, and then one set of batteries should be separated from the DC system. The 10-hour discharge rate I 10 Discharge, when setting the current, because the instrument is not accurate enough, it is often necessary to increase or decrease it based on experience. Less discharge has been carried out, and with the progress of discharge, the voltage of the storage battery has been dropping, and its discharge current is also changing, and then the discharge current I 10fd multiplied by the discharge time t fd Calculating the discharge capacity is not accurate enough, resulting in large errors and even misjudgments
The load current often has certain fluctuations and is not stable enough. The discharge current after the discharge instrument is set is constant.
Due to the fluctuation of the load current, this will cause the battery to discharge more or less, resulting in increased measurement errors, and sometimes qualified batteries will be misjudged as unqualified batteries
[0005] In addition, the heating element of the current discharge instrument on the market is a ceramic resistor. With the operation of the equipment, the internal heating element is continuously oxidized, and the performance is degraded. It is necessary to adjust the settings again, resulting in inaccurate measurement and increased labor intensity, etc.
[0006] All of the above reasons lead to large errors in the easy test of the battery, which seriously affects the accuracy of the test results and the judgment of the battery performance.

Method used

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  • Storage battery discharging instrument and discharging current regulating method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A storage battery discharge instrument, comprising a discharge unit 4 and a set current unit 2 connected to the discharge unit 4 , an automatic adjustment unit 3 is arranged between the set current unit 2 and the discharge unit 4 . The discharge unit 4 includes 8 sub-discharge units 1 connected in parallel, and each sub-discharge unit 1 includes 8 GTR transistors connected in series, and the base of each GTR transistor is connected in series with a resistor R b , by adopting the resistance Rb to improve the current balance degree of the generator electrode; each sub-discharge unit 1 is provided with a preamplifier module and a resistor R connected in series with the preamplifier module d , the pre-amplifier module can use the simplest amplifier tube, or a conventional pre-amplifier circuit, by selecting the amplification factor of the sub-discharge unit and the pre-amplifier tube, or the sub-discharge unit and the pre-amplifier circuit, so that The total current of each...

Embodiment 2

[0031] The difference between this embodiment and the first embodiment lies in that the eight sub-discharge units 1 connected in parallel are packaged with a temperature sensor and a radiator respectively, and are controlled by the same controller. It can effectively improve heat dissipation efficiency, avoid unnecessary heat dissipation, keep each sub-discharge unit at a relatively constant temperature, ensure stable performance of each sub-discharge unit, and reduce current deviation.

Embodiment 4

[0033] A method for automatically regulating the discharge current of the battery discharge instrument in the above embodiment, comprising the following steps:

[0034] a) Set the discharge current through the setting current unit 2 in advance to obtain the set discharge current I r ;

[0035] b) During discharge detection, the automatic adjustment unit 3 obtains the actual discharge current I of the storage battery through the shunt SH fd ;

[0036] c) The operational amplifier module of the automatic adjustment unit 3 compares the actual discharge current I fd with the set discharge current I r the size of:

[0037] When I fd = I r , the operational amplifier module does not output;

[0038] When I fd > I r , the operational amplifier module outputs an adjusted current signal that reduces the current to the preamplifier module;

[0039] When I fd r , the operational amplifier module outputs an adjusted current signal that increases the current to the preamplifier ...

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Abstract

The invention discloses a storage battery discharging instrument which comprises a discharging unit and a current setting unit. An automatic adjusting unit is arranged between the discharging unit and the current setting unit. The automatic adjusting unit is arranged between the discharging unit and the current setting unit, the automatic adjusting unit is used for collecting discharging currents in the discharging unit, the discharging currents are compared with currents in the current setting unit, so that the currents of the discharging unit are adjusted in real time, and regulating of the discharging currents in the discharging unit is achieved. Thus, the discharging currents are stable and accurate, the accuracy and precision of an energy storing test of a storage battery are improved, adjusting is automatic, the storage battery discharging instrument is easy and convenient to operate, and the labor intensity of operating workers is greatly lowered.

Description

technical field [0001] The invention relates to a battery capacity test tool, in particular to a battery discharge instrument and a discharge current control method of the discharge instrument. Background technique [0002] At present, power plants and substations generally use DC operating power supplies that store electrical energy in batteries, which can be regarded as independent power supplies that have nothing to do with the primary systems of power plants and substations, which can simplify the power supply structure for operation and protection, and appear in power plants and substations. In the event of failure or even the complete disappearance of the AC power supply, the DC system of the battery can still work reliably, effectively ensuring the reliability of the power supply of the DC system. In addition, due to the stable voltage and large capacity of the battery, it can provide a large inrush current when the circuit breaker is closed, and can be used as a back...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36G05F1/613G01R1/00
Inventor 姚力韩源陶凤源任永杰陈士平应会军李晓芳赵永浩李亮
Owner LUOHE POWER SUPPLY OF HENAN ELECTRIC POWER CORP
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