The BREVE design team has developed, to a customer’s order, an unusual unit of adjustable AC and DC power supplies. The equipment was designed for test work in the manufacture of operating mechanisms for power disconnectors.
The power supply unit allows smooth, accurate and independent adjustment of AC and/or DC voltages on five separate outputs. All outputs are isolated from the mains and from one another, which guarantees safe operation for the operators. It has been fitted with high-grade digital meters, which qualifies the set for research work. The equipment incorporates a number of innovative solutions relating to a significant improvement in setting resolution, in the speed at which the DC output settings can be changed in the downward direction, and in ergonomics.
Technical parameters of the set:
– Supply 3x400V+N
– Continuous rated power: 21800W
– Rated apparent power: 22500VA
– Out1:
- Range1 : 80-150VDC 72A (continuous duty)
- Range2 : 170-275VDC 72A (continuous duty)
- Voltage drop on out1 at 20A <=3%
- Voltmeter + ammeter, digital
- Range selection by two switches
- Additional ranges 65-168 and 188-260 VDC 72A
- VDC adjustment ranges given for a current of 72A with a tolerance of +-2V
- Switching the power supply output on – by means of pushbuttons
– Out2 : 0-250VAC 1-phase min 2A
– Out3 : 0-250VAC 1-phase min 2A
– Out4 : 0-250VDC min 2A
– Out5 : 0-250VDC min 2A Illustrative drawing
– Out 2..5 independently adjustable, each with a digital voltmeter
– Out6 : AC circuit continuity tester (LED + buzzer), low current, low voltage (isolation)
– Outputs 2-6 switched on and off by means of illuminated switches
– Isolation from the supply mains – no risk of electric shock through earth fault current
– Safety switch
– Overcurrent protection at the input + protection of the individual outputs
– Mobile equipment on wheels
– Handles for moving the unit and a reel for winding up the mains lead
– 20m mains lead with a 3-phase 32A plug
– Indicators showing that the individual outputs are switched on
– Outputs brought out to laboratory terminals
– Total mass approx. 280kg
