PSP 691UA standby Power Supply Automatic switching device
1 Function
1.1 Three automatic switching modes (bus coupler automatic switching, incoming line recovery, incoming line mutual switching)
1.2 Buscouple switch Two phase three section overcurrent protection based on dsp
1.3 Post acceleration protection of buscouple switch
1.4 Operation circuit without buscouple switch
1.5 GPS time synchronization (minute pulse, second pulse or IRIG-B mode
2 Principle description
2.1 Automatic switching mode I (bus coupler automatic switching)
1) During normal operation, two sections of buses operate separately, two sets transformer Each is equipped with a section of bus. When an incoming power supply fails or is cut off for other reasons
On, the bus coupler switch shall be put into operation automatically, and only one action is allowed.
2) When the incoming switch trips manually, or the device is not charged, or there is external locking, the bus coupler switch shall not be put into operation automatically.
3) Charging conditions: bus I and bus II are three-phase voltage, 1ZKK and 2ZKK are in the closing position, and 3ZKK is in the opening position.
The charging is completed after the charging conditions meet 15s, and the standby automatic switching is ready.
4) Discharge conditions: three-phase voltage free for bus I and bus II, or 3ZKK in closing position or with external locking input.
The discharge is completed instantaneously after the discharge conditions are met, and the standby automatic switch is not ready.
5) Buscouple standby # 1 incoming switch (3ZKK standby 1ZKK)
If bus I has no voltage or 1ZKK trips and 1TA has no current, then bus II has voltage and trips 1ZKK after delay. After confirming that 1ZKK trips (1ZKK is in the trip position and
1TA no current), close 3ZKK.
6) Buscouple standby # 2 incoming switch (3ZKK standby 2ZKK)
II bus without voltage or 2ZKK tripping position 2TA without current, I bus with voltage tripping 2ZKK after delay, after confirming 2ZKK tripping (2ZKK is in tripping position and
2TA no current), close 3ZKK.
7) Two phase three section current protection:
Ia>Izd or Ic>Izd set delay tripping
8) Rear acceleration section protection:
After the buscouple switch is closed, monitor the current flowing through the buscouple switch within the set post acceleration effective time. If Ia>Izd or Ic>Izd is adjusted
Fixed time delay tripping. Otherwise, after the set effective time of post acceleration, the post acceleration segment will exit automatically.
9) PT disconnection alarm:
If the difference between the larger voltage and the smaller voltage of the bus exceeds 30% of the rated voltage and the delay is 3 seconds, the PT is considered to be disconnected (two-phase disconnection or single-phase disconnection). or
If the incoming line has voltage, the incoming line switch is closed and the bus is low voltage, then the PT is considered to be disconnected (three-phase disconnection). PT disconnection can be selected as sending only
Or lock the standby automatic switching. In order to make the two phase disconnection voltage of PT not completely lost, the N line of PT should be connected to the device.
2.2 Automatic switching mode II (incoming line recovery)
1) During normal operation, # 1 (# 2) incoming line has two sections of bus, and # 2 (# 1) incoming line is powered off due to fault. 1ZKK (2ZKK) and 3ZKK are in closing position,
2ZKK (1ZKK) is in the split position. When the power supply of # 2 (# 1) incoming line is recovered, trip 3ZKK and close 2ZKK (1ZKK).
2) Charging conditions: bus I and bus II are three-phase voltage, 1ZKK (2ZKK) and 3ZKK are in the closing position, and 2ZKK (1ZKK) is in the opening position.
The charging is completed after the charging conditions meet 15s, and the standby automatic switching is ready.
3) Discharge conditions: three-phase voltage free for bus I and bus II, or 2ZKK (1ZKK) in closing position or with external locking input.
The discharge is completed instantaneously after the discharge conditions are met, and the standby automatic switch is not ready.
4) Automatic recovery of # 1 incoming power supply
When Ux1 is under voltage, 3ZKK will be tripped after delay, and 1ZKK will be closed after 3ZKK is confirmed to be tripped.
5) Automatic recovery of # 2 incoming power supply
When Ux2 is under voltage, 3ZKK will be tripped after delay, and 2ZKK will be closed after 3ZKK is confirmed to be tripped.
2.3 Automatic switching mode III (incoming line mutual switching)
1) During normal operation, # 1 (# 2) incoming line is equipped with working bus, and # 2 (# 1) incoming line is used as standby. 1ZKK (2ZKK) in closing position, 2ZKK (1ZKK)
In sub position, 2ZKK (1ZKK) is for standby. When # 1 (# 2) incoming power supply fails or is disconnected for other reasons, # 2 (# 1) incoming switch
It shall be put into operation automatically, and only one action is allowed.
2) When the incoming switch trips manually, or the device is not charged, or there is external locking, the standby incoming switch shall not be put into operation automatically.
3) Charging conditions: the working bus is three-phase voltage (at least one of bus I and bus II is voltage), and # 2 (# 1) line is voltage. 1ZKK (2ZKK)
Closing, 2ZKK (1ZKK) is in the opening position.
The charging is completed after the charging conditions meet 15s, and the standby automatic switching is ready.
4) Discharge condition: 2ZKK (1ZKK) is closed or # 2 (# 1) line has no voltage or external locking input.
The discharge is completed instantaneously after the discharge conditions are met, and the standby automatic switch is not ready.
5) Locking conditions of standby automatic switching:
5.1) 1ZKK or 2ZKK hand jump.
5.2) External input locking (4X21, 4X22, 4X23, 4X24).
5.3) Standby automatic action fails.
5.4) Switch position is abnormal.
5.5) I-bus TV disconnection alarm.
5.6) II bus TV disconnection alarm
