SCR ELEKTRONIKS have developed equipment namely“DC CONSTANT CURRENT SOURCE”. The system comprises of Constant Current Sources having ranges: 900A continues & 3000A short time at 8V maximum.
This test bench will enable the user to carryout: Short Time Current Test up to 3000 Amp for short time. This test will conducted for a time period ranging from 0.1Sec to 5Sec depending of customer specification. The equipment will be designed to control the timing precisely.
Input Supply 415V AC 28A for Three Phases.
Output – Adjustable in steps with Transformers and Switches i.e. 0 to 4V, 0 to 8V.
Output DC Current – a) 100A to 900A continues @ 8V DC b) 100A to 3000A short time @12V DC. c) Ripple : Less than 4%
Control – True RMS Sensing Servo Controller will be used to keep the current within +/- 1% of set value.
Current Measurement – There will be two Shunts. Shunt 1 with 0 to 900A and Shunt 2 with 3000A. Taps will be provided to measure & control the current accurately. The selection of shunt will be with link.
Controls & Indication : a)Digital Voltmeter : For variac position 0 to 500V AC Accuracy Class 1.Digital Servo b)Controller : For test current which reads the value in terms of shunt Range. 0 to 1.000 count. Accuracy Class 1. c)Transient Recording Meter : This records the current value even if it is flowing for short time (100msec.) This is used for adjusting the Test current Value (fault current) with the help of other arrangstrongent so that the cables and other accessories do not get heated up during setting the test current. This also monitors the current value an d continues to display the same even if the current ceases to flow after the set time. d)ON/OFF Cyclic Timer : ON/OFF Cyclic Timer Unit will be provided to log ON/OFF cycles. This’ll enable recording test cycles for long test durations and also in case of power failure (UPS to be provided by you).Shunt 1 with 900A-200mV and Shunt 2 with 3000A - 200mV for current measurement with Accuracy Class 0.5.
Test ON/OFF, Reset, Emergency OFF Push Buttons.Protection : Over Current trip with 10sec. Delay.
Panel will built in M.S. Fabricated trolley with powder coating of minimum 80 micron thickness. Four inch Nylon wheels will be provided for easy movement of trolley.
The system can be customized as per short time and continuous current ratings. Also, additional test modules like temperature rise, millivolt drop, etc. can be integrated.
The system typically comes with a continuous rating and a short time rating, thus making it suitable to test DC breakers, HVDC panels and components as well as cables. Additional tests that can be carried out include temperature rise, millivlt drop, trip time-current analysis, etc.
