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Routine Maintenance Items
This chapter introduces routine maintenance items for power supply system and maintenance operation methods. The power supply system maintenance items are list in Table 28.
Table 28: Maintenance items for power supply system
NO
.
ITEM TEST STANDARD
TEST
TOOLS
TEST METHOD
1
System current sharing
After each rectifier is over half load, the output current imbalance between rectifiers should be less than ±3%
Calculate the imbalance based on the output current of each rectifier displayed on the controller; or the rectifier output current displayed on each rectifier
2
Display of voltage / current
The difference between the rectifier voltage, busbar voltage and various output voltages displayed on the controller shall be less than 0.2V; the difference between the sum of the displayed currents of all rectifiers and the sum of charge current and total load current shall be within the specified error range
Read the voltage and current values displayed on the controller and rectifiers, and make judgement according to the above standards
3
Parameter setting
Conduct compliance check according to the record of the previously setting parameters
(parameter table)
Reset those parameters not in conformity with the specified requirements. The operation method of parameter setting can refer to Setting Basic Parameters for Controller
4
Communicatio n function
The communication between each system unit and the controller shall be normal and there shall be no record of frequent communication interrupt between one certain unit and the controller in the historical alarm record
5 Alarm function
Alarm should be given out in case of fault
Check the testable items on the spot. Testable items include AC mains failure, damage to SPDs (SPDs with alarm indicator or alarm contact), module failure and
DC fuse blowout (test shall be conducted on unload fuse)
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NO
.
ITEM TEST STANDARD
TEST
TOOLS
TEST METHOD
6
7
Protection function
Management function
8 Noise index
Conduct compliance check according to factory parameters or parameters set through the controller
The calculation, storage and battery auto-management functions performed by the controller. The historical alarm record can be queried, and the battery auto-management function is testable
Psophometrically weighted noise ≤
2mV; peak – peak noise ≤ 200mV
Noise meter, oscillogra ph
This item is generally not easy to test when the system is in the operation. It is usually conducted when the protection function of the power supply is abnormal due to frequent occurrence of AC or DC protection. Test methods including testing the AC under/overvoltage protection function through external voltage regulator and testing the DC under/overvoltage protection function by forced discharge
1. Storage function: simulate an alarm, the controller will record the alarm information.
2. Battery automanagement: the battery charge mode and charge current can be adjusted and various protections can be implemented through the monitoring module according to the data set by the user
During noise measurement, the batteries should be separated from the power equipment. However, for the sake of safety of power supply, the batteries cannot be disconnected during field operation. Therefore, this test should only be done when the communication quality of the exchange is poor and the power supply quality of the power equipment is considered not in conformity with requirements. The psophometrically weighted noise, input through the positive and negative busbar, can be measured by a noise meter, which shall be geared to “telephone noise” measurement scale.
The peak – peak noise can
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NO
.
9
ITEM
Internal connection
10
Vent duct and dust deposit
TEST STANDARD
TEST
TOOLS
TEST METHOD be measured by an oscillograph. For test method refer to the equipment operation instructions
The socket shall be well connected; the cables shall be well laid out and fixed; there shall be no cables that have been squeezed out of shaped by metal components; and there shall be no partial overheat or aging of connection cables
There shall be no blockage or dust deposit in the vent ducts of rectifier fans or vent ducts in the cabinets
Hairbrush es, leather bellows, etc
Remove, clean and wash the guard boards of the vent ducts and the fan; replace them after they have been dried
11 DC cables
11 DC cables
12
Configuration of DC circuit breakers
13
Voltage drop and temperature rise of nodes
The permissible voltage drop determined in circuit design is generally less than 0.5V (low impedance distribution)
The permissible voltage drop determined in circuit design is generally less than 0.5V (low impedance distribution)
The rated current of the DC circuit breaker should not be more than twice of the maximum load current. The rated current of the circuit breaker in each special equipment room should not more than 1.5 times of the maximum load current
Note down the maximum current flowing through the cables, look up the sectional area and wiring length of the cable in the design plan, calculate the voltage drop and check whether it meets the design requirements
Check the adaptability of the circuit breakers according to the recorded maximum current of each load
If below 1000A, the voltage drop s hould be ≤ 5mV for every hundred ampere; if above 1000A, the voltage drop should be ≤ 3mV; and the temperature rise of node should not exceed 70°C
Multimet er, semicond uctor thermom eter
Use multimeter to measure the voltage drop between the buses and cables at the two terminals of the node; and judge the rationality of the voltage drop of the node based on the current flowing through the node. Use the semiconductor thermometer to measure the temperature rise of the node. The measurement results should meet the temperature rise limitation and voltage drop limitation requirements
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