CSPN Capacitor Charging Unit Operation Manual
CSP-CSPN-8000/1
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63
High Voltage Section
The right side of the unit contains the high voltage parts. Each capacitor is switched in and out of
circuit by 12 kV rated, spring relays. The relays use a rotating moving contact which is silver
plated. The fixed contacts can be rotated in the event of wear. When disconnected, the capacitors
are discharged through the relays to ground via 10k
resistors, which are mounted on a circuit
board on the RH panel. Although physically small, these resistors can handle 2000J pulses at well
in excess of the rated voltage of the unit. It should be noted that the average power these resistors
can tolerate is 6 watts. Repeated discharge of the capacitors into these components will cause
them to fail.
A specially designed high current thyristor switch is used in the CSPD , interfaced to the control
board by an interface board. This is held in place with an isolated clamp arrangement
manufactured from Nylon 66.
Note: All models operate at approx 4KV.
HV Monitor Board
Using a shunt resistor and current sensor the HV monitor circuitry monitors the output current to
prevent excessive load currents damaging components. The circuitry also monitors the HV voltage
to detect open circuit load conditions where the energy has not been discharged. Upon detection of
the above faults the board flags a LOAD fault to the control board, this fault is automatically reset
after 10secs in order to warn the operator of a possible fault with the load thus preventing damage
to internal circuitry.
HV Detect Board
This board using a HV resistor voltage divider via opto isolator provides voltage feedback to the HV
Monitor board on the charge status of the capacitors to detect an open circuit fault condition. The
board also contains diodes to protect the output bridge of the charger from reverse voltage swing.
There is also a set of high current diodes which are used to limit the amount of reverse voltage
swing on the output of the unit.
HV Charger
The HV Charger is fitted under the large storage capacitors and runs from the rear (where air is
brought in) to the front of the unit. The charger is designed as a module, and we would not expect
that field servicing could be carried out on this unit.
To gain access to the charger, the rear panels will need to be lowered.
Connections:-
L2 - LINE
COM
–
NEUTRAL
GROUND
Summary of Contents for CSP-N 1200
Page 1: ...CSPN Capacitor Charging Unit Operation Manual ...
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