After the installation of DC power supply equipment is completed, a switching acceptance test should be conducted before putting it into use. The receiving unit shall send personnel to participate in the test, and the tested items shall meet the technical requirements before being put into trial operation. If everything is normal during the 72 hour trial run, the receiving unit can sign and accept it. The switching acceptance test and requirements are as follows:

(1) Insulation monitoring and signal alarm testing.

1) When the DC power supply equipment is running without load, the rated voltage using a 25kf2 resistor is 220V; the rated voltage using an IOV resistor is 7ki2; The rated voltage is 48V, using l. The resistance is 7ki2. The DC bus should be grounded separately and sound and visual alarms should be issued.

2) When the DC bus voltage is lower or higher than the set value, a low voltage or overvoltage signal should be issued, and an audible and visual alarm should be triggered.

3) When the output current of the charging device is 105% to 110% of the rated current, it should have a limited current protection function.

4) For DC power supply equipment equipped with microcomputer based insulation monitors, the insulation status or grounding of any branch should be able to be monitored, displayed, and alarmed.

5) The display, monitoring, and alarm of remote signals should be normal.

(2) Voltage withstand and insulation tests.

1) Before conducting the withstand voltage test, electronic instruments and automatic devices should be disconnected from the DC bus and subjected to a power frequency of 2kV. The DC bus and each branch should withstand voltage for 1 minute without flashover or breakdown.

2) The insulation resistance of the DC bus and each branch of the DC power supply device should not be less than 10MQ when measured with an I000V megger.

(3) Capacity test of battery pack.

Different types of batteries have different charging and discharging rates. Newly installed batteries should be charged at a specified constant current, fully charged to capacity, and discharged at a specified constant current until one of the batteries reaches the termination voltage. Calculate the capacity using the following formula: C=Ift, where C represents the capacity of the battery pack, Ah；， , - constant discharge current, A; - discharge time question, h。

(4) Constant current charging and stable current accuracy range.

1) The stable current accuracy of the magnetic discharge large charging device should not exceed ± (2%~5%);

2) The phase controlled charging device should have a stable current accuracy of no more than ± (1%~2%);

3) The high-frequency switch module type charging device should have a stable current accuracy of no more than -4- (0.5% to 1%).

(5) Range of voltage stabilization accuracy for constant voltage charging.

1) Magnetic discharge large charging device, voltage stabilization accuracy should not exceed ± (1%~2%);

2) Phase controlled charging device, voltage stabilization accuracy should not exceed -4- (0.5% to 1%);

3) The high-frequency switch module type charging device should have a voltage stabilization accuracy of no more than -4- (0.1% to 0.5%).

(6) Range of DC bus ripple factor.

1) Magnetic discharge large charging device, ripple coefficient should not exceed 2%;

2) Phase controlled charging device, ripple coefficient should not exceed 1% to 2%;

3) The ripple coefficient of the high-frequency switch module charging device should not exceed 0.2% to 0.5%.

(7) The noise requirement should not exceed 55dB (A), and if a ventilation fan is installed, it should not exceed 60dB (A).

(8) The anti-interference ability of the automation device in the DC power supply device should meet the requirements of JB/T 5777.4-2000.

(9) The current harmonics of the charging equipment returning to the AC power supply side should comply with the power industry standards DL/T459-2000 "Technical Conditions for Ordering DC Power Supply Machines for Power Systems" and JB/T 5777.4-2000 General Technical Conditions and Safety Requirements for DC Power Supply Equipment.

(10) Continuous power supply test of DC bus: In case of sudden interruption of AC power supply, continuous power supply should be provided to the DC bus, and the voltage fluctuation should not exceed 10% of the rated voltage.

(11) Microcomputer controlled automatic conversion program testing.

1) Once the main power supply device of the microcomputer monitor is put into operation, the parameters can only be checked through the display button. If everything is normal, the setting parameters cannot be changed arbitrarily.

2) If the microcomputer monitor does not work properly during operation, the program can be modified and readjusted. If the desired operating mode cannot be achieved, please start manual operation, adjust to the desired operating mode, and then exit the microcomputer monitor. Before putting it into operation, submit it to professionals for inspection and maintenance.

(12) Supplementary charging program for valve controlled batteries.

The microcomputer will control the charging device to automatically perform constant current charging, constant voltage charging, and floating charging according to the set time (1 month or 3 months), always ensuring that the battery pack has the rated capacity. When the AC power supply is interrupted, the battery pack will continue to supply power to the DC bus without interruption. After restoring the AC power supply, the charging device will enter a constant current charging state, then perform constant voltage charging and floating charging, and then switch to normal operation.

(13) Three remote "function test.

The control center uses remote signaling, telemetry, and remote control interfaces (RS485, 422, 232) to understand and control the DC power supply devices running in the remote substation. Remote signaling content: DC bus voltage too high or too low signal, DC bus grounding signal, charging device fault signal, etc.

Telemetry content: DC bus voltage and current values, battery pack voltage values, charging current values, and other parameters. Remote control content: startup and shutdown of DC power supply device, switching of charging device.

(14) The acceptance unit shall obtain the relevant documents.

1) Installation and use manual, equipment factory test report, packing list, automatic device manual, battery charging record and curve.

2) Handover test and various parameter test reports for the battery pack before operation.

3) Electrical schematic wiring diagram and secondary wiring diagram.

4) The handover acceptance report signed by both parties.