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2.3.3 Valve periodic battery maintenance measures

2.3.3.1 are regularly recharged. Charging pressure are used 2 35V / monomer ± 0 02V. Every three months to 6 months should have one charge times should be normal float voltage difference depending on the extent to decide. Both the charging time is generally 8 ~ 12h. The purpose of a regular basis are charging are: the elimination of temperature changes without a timely amendment to float voltage change; battery float voltage regular discharge but should not the stipulated period of time sufficient for its electricity.

2.3.3.2 periodic amendments to the battery float voltage value system

Because of the battery float voltage value system influenced by temperature, so the battery system should be based on the use of ambient temperature changes in a timely amendment of the charging voltage value system. Annually adjust the general settings 2 ~ 4 times. Adjust the standard as follows: the ambient temperature increased by 1 ℃, the lower the float voltage 0 003V / monomer; ambient temperature every 1 ℃ lower, the higher float voltage 0 003V / monomer. Battery operation in high-temperature environment (greater than 30 ℃), because of the battery internal resistance become smaller, more efficient battery charging, battery capacity will increase. Therefore appropriate to reduce充充电float voltage value, reducing the float current, battery capacity is not affected. When the battery is running low ambient temperature (20 ℃ below), the battery inside the lead sulfate solubility and dissolution rate of lower electrolyte concentration polarization increases at the same time by the electrolyte resistivity increase caused by the change of the battery internal resistance, so the requirements in low-temperature conditions have a higher charge voltage, in order to meet the charging requirements. Otherwise it will create less than the phenomenon of charge.

2.3.3.3 regularly check discharge test

A post-mortem at a floating battery system of long-term work, because of the excessive negative electrode active material composite design and the existence of oxygen, resulting in negative plates have a part of the total active material in less than a state of charge, but also because of the long-term float current and not enough to make a very small board within the active substances are fully electrochemical reaction caused by the internal electrode active material sulfation, thereby reducing the capacity of negative electrode plates so that battery life be affected. To avoid these phenomena, for the long-term job in a floating state of the battery charging system should be different depending on the status of job to take every 6 months or 12 months to check one times of discharge test. When the 6 months one time when the discharge depth of discharge can be more shallow, should adopt the 30% ~ 40%, if 12 months may be appropriate when discharge test some better advised to 50% ~ 60%, in-depth understanding will be easily observed battery system breakdown monomer battery.

3 Concluding remarks

In short, the VRLA battery maintenance is very important, according to valve-regulated lead-acid batteries of different characteristics, in view of the impact of VRLA battery life of the main factors, and continuously improve the level of maintenance to enhance the purpose of life to improve the operation of substation DC system reliability, to ensure the safe operation of power grids.

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1.3 the impact of the unbalanced nature of the charge-discharge

The study results show that: different parts of grid alloy composition and structure of the distribution are different, and thus grid will lead to the unbalanced nature of the electrochemical performance, which in turn is the unbalanced nature of the floating charge and charge and discharge state voltage difference, and as the charge, discharge cycle, so that this difference increasing to form a so-called “behind the battery (battery failure).” At present, the standards require, in one group of the largest battery float voltage difference should be ≤ 50mV, while developed countries are the standard ≤ 20mV, so should pay attention to and reduce the floating state of the battery operating voltage differences.

1.4 thermal runaway phenomenon

VRLA battery because of the use of depleted fluid design, battery electrolyte perfusion are adsorbed on glass fiber, when the charge current increases, on the adoption of necessary safety valve to release gas, resulting in the battery water loss, resistance by large capacity fading and filling, discharge process a large number of calories, such as time to the proliferation of these heat related to temperature increase, will lead to thermal runaway. Thermal runaway causes are not promptly reduce the float voltage, lax safety valve or open valve pressure is too low and so on, in hot severe cases out of control if the discharge, it is possible to make batteries and battery voltage sag moment shell temperature rose to 70 ~ 80 ℃, and therefore thermal runaway problem should elicit a high degree of attention.

VRLA battery 2 Operation and Maintenance

In response to the above affect the service life of VRLA battery factor analysis, in order to improve the service life of VRLA batteries, we must do the following.

2.1 strict quality

In battery selection and procurement process, it is necessary to fully understand the manufacturer’s production process, manufacturing process and quality control tools, as well as technical characteristics and, if necessary, may require manufacturers to carry out the first time in the capacity of experiments to screen a smaller battery difference.

2.2 reasonable charging equipment selection

For valve-regulated lead-acid battery charging equipment selection, the appropriate selection of high-quality high-frequency switching power supply or control power, the ripple coefficient, precision regulator, steady flow of key indicators such as accuracy requirements should be higher and should have real-time monitoring and intelligent management capabilities that will enable sealed battery at all times the best job in the state. For high-frequency switching power supply module when there is failure, should be able to immediately quit running and do not affect the normal operation of other modules to ensure the battery module failures do not cause over-discharge.

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