A storage battery discharge instrument and its discharge current control method

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 meter and a discharge current control method of the discharge meter. Background technique [0002] At present, the DC operating power supply used in power plants and substations to store electrical energy can be regarded as an independent power supply that has nothing to do with the primary system of power plants and substations, which can simplify the power supply structure for operation and protection. It appears in power plants and substations. In the case of failure or even the complete disappearance of the AC power supply, the battery DC system can still work reliably, effectively ensuring the power supply reliability of the DC system. In addition, because the battery voltage is stable and the capacity is large, it can provide a large inrush current when the circuit breaker is closed, and can be used as a backup power source for accident safety loads. [0003] Th...

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.

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