1. Maintenance of DC system

1) the internal dust of the high frequency switch power module is cleaned regularly.

2) the dust in the DC screen is cleaned regularly.

3) the annual battery should be based on the actual load for a discharge current should be kept stable, the rated capacity of about 30% (released by 0.1C discharge 3 hours), discharge per hour should be measured a single battery and battery voltage, discharge current, temperature, discharge should be carried out after the balanced charging and turn to float.

4) each month should measure the cell single cell voltage and terminal voltage, check the appearance of abnormal deformation and heat, and keep the full operation record.

5) should check once a year the connecting wire is firm, whether there is corrosion, loose should be tightened to the prescribed torque, corrosion should be replaced;

6) do not increase or decrease the load of single battery in battery pack alone, which will cause unbalanced capacity and uneven charge of battery and reduce battery life.

7) common fault and treatment

(1) abnormal shell of battery. The causes are as follows: the charging current is too large, the single battery charge voltage exceeds 2.4V, the internal short circuit or partial discharge, the temperature rise exceeding the standard, the valve control failure. Processing method: reduce the charging current, charging voltage decrease, check the safety valve is blocked.

(2) in the operation of the floating charge voltage is normal, but the discharge voltage dropped quickly to the termination voltage due to battery internal electrolysis, dehydration dry material modification. At this time, the manufacturer should be informed of the replacement of the battery.

Two, the principle of emergency treatment

The basic principle of emergency handling of A and power supply system failure is to maintain the DC power supply of the system.

B, power system communication security threat or failure caused by interruption of communication mainly includes: AC circuit unrecoverable damage; DC load or short-circuit DC distribution; rectifier module paralyzed; monitoring module caused by uncontrolled shutdown accident; DC output overvoltage caused by module blockade.

1) emergency treatment of DC power distribution

(1) load partial short circuit: disconnect the damaged load DC circuit breaker or feed fuse. (2) distribution circuit: due to carelessness of operator or natural or natural factors, DC distribution short circuit fault will directly affect the safety of DC system. After the failure occurs, the following steps should be taken to deal with: cut off the AC power supply, separate the battery from the system, and use battery or rectifier module to directly supply the load. 2) monitoring system failure emergency handling monitoring system failure affects DC power supply safety, just turn off the monitoring module, but we should pay attention to the management and maintenance of batteries at this time.

3) emergency handling of module fault

(1) the internal short circuit of the module: the module can automatically withdraw from the system when the module is short circuited. (2) part of the module damage: after a part of the module is damaged, as long as the remaining intact module can meet the load power supply requirements, switch off the damaged module of the AC power supply. (3) module output overvoltage: when the load current is lower than the capacity of a single module, the overvoltage of a module will cause overvoltage, overvoltage protection for all modules, and automatic recovery. The processing method is to turn off all the modules of the AC switch, then open the module one by one. When a module system is overloaded again, turn off the module and open other modules, and the system will resume normal work.