1. DC bus voltage is too high or too low
(1) Fault phenomenon: the central audio signal “bell†sounds; the DC bus fault “light card†is on; the DC bus voltage indication deviates from the allowable value.
(2) Troubleshooting:
1) Check that the voltage relay of the voltage monitoring device is operating correctly.
2) Observe the output voltage of the charger device and the DC bus insulation monitoring instrument display, or measure the bus voltage with a multimeter to comprehensively determine whether the DC bus voltage is abnormal.
3) Adjust the charger é„ output to restore the DC bus voltage and float current to normal.
4) If the DC bus voltage is abnormal and the charger device is faulty, the charger should be deactivated and switched to the standby charger.
2. DC system grounding
(1) Fault phenomenon: the central audio signal "alarm bell" rings; "DC bus fault" light plate is bright; the "insulation reduction" indicator of the DC system insulation monitoring device is on; measuring the DC bus positive and negative ground voltage, not at all balance.
(2) Fault handling: In order to prevent another ground from appearing after a little grounding, causing protection misoperation or refusal, or causing a short circuit between the two poles and burning the battery, it is necessary to quickly eliminate a ground fault of the DC system. Ways to find a grounding point,
The principles and sequence are as follows:
1) The method of finding the grounding point. The instantaneous power-off method is used to find the grounding point, that is, the switch of a DC feeder is instantaneously opened, and the switch is quickly closed (the cutting time does not exceed 3 s). When pulled open, if the ground signal disappears and the voltage of each pole to ground indicates normal, the grounding point is energized in the loop.
2) The principle of finding a grounding point. 1 For the DC system of the double busbar, it should first be determined which busbar is grounded; 2 Check the DC feeders according to the important load after the first secondary load, first indoor and then the indoor, then check the battery, charging equipment, DC bus; 3 pairs The required DC feeders (such as accident lighting, signal devices, and closing power supplies) are searched by the instantaneous stop method. For important feeders that do not allow short-term power outages (such as tripping power supplies), the load should be transferred first, and then the instantaneous stop method should be used. Look for the grounding point.
(3) Find the grounding point in the following order:
1) Determine the polarity of the ground and the degree of grounding. The DC and insulation monitoring devices are used to measure the voltages of the positive and negative poles to ground. When the insulation is good, the voltages of the positive and negative poles are equal or zero; if the voltage of the positive pole to ground increases or equals the voltage of the busbar, and the voltage of the anode decreases or equals zero, the insulation of the anode is reduced or grounded; otherwise, the cathode insulation is lowered or grounded. .
2) Check if the DC feeder circuit of the maintenance equipment or the power transmission equipment is grounded.
3) Check if the DC lighting and power circuit are grounded.
4) Check if the circuit of the flash device and DC insulation monitoring device is grounded.
5) Check if the control and signal circuit are grounded (disable the relevant protection first).
6) Check if the charging device and battery are grounded.
7) If the grounding point is not found after the above inspection, the busbar is grounded.
3. Charger device failure
Common faults in chargers are:
(1) Overvoltage and overcurrent occur in the device output. When overvoltage and overcurrent occur in the output of the device, the device can automatically protect and emit an audible and visual alarm signal. At this time, the voltage and current adjustment knob should be rotated to zero position, press the alarm twice, protect the reset button, and then adjust the voltage and current adjustment knob to make the voltage or current reach the actual use value.
(2) AC input failure. When the input AC fails, the device can automatically protect and emit an audible and visual alarm signal.
At this time, the power switch of the device should be opened, and the alarm of the device should be cancelled. After the AC fault is removed, the power switch is closed and the device is restarted according to the normal operation procedure.
(3) The fuse is blown. When the primary protection fuse (or secondary protection fuse) of the rectifier transformer T of the device is blown, the device can automatically protect and emit an audible and visual alarm signal. At this point, the AC input power switch should be pulled open to find out why the fuse is blown. After troubleshooting, replace the melt with the same capacity as the original fuse and restart the unit according to normal operating procedures.
(4) The device does not reach the rated nominal voltage. When the device does not reach the nominal rated voltage, the phase sequence of the three-phase AC input of the first step check device is consistent with the device requirements; the second step checks whether the secondary voltage of the rectifier transformer meets the requirements (ie U=1.35 Uz. For DC output voltage, U2 is the output voltage of the rectifier transformer, 1.35 is the three-phase rectification coefficient); the third step is to check whether the 6-channel pulse waveform is normal; the fourth step checks whether the thyristor of the rectifier main circuit is damaged.
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