SCR ELEKTRONIKS have developed “PC BASED TEMPERATURE RISE TEST BENCH 25kA” to measure rise in temperature at various points as mentioned in standard at junctions. The set-up consists of a True RMS Constant Current Source (to maintain the Current within + / - 1 % of set value with Digital Indication), PC based control system, Temperature data logging on PC, Servo-Controller and other indications. Digital voltmeter Primary Voltage indicates the position of auto transformer (variac).
Servo controlled mechanism is used to maintain constant current throughout the test in manual mode. CR/AL('K' type) type thermocouples are used for temperature sensing.
It has automatic test procedure, user access control, secured database, maintenance mode & most importantly an elaborate module for report generation & test-data analysis.
Output: Current Source 50Ato 10KA Cont & 25KA 5Sec
CT range selections: 200, 500, 1KA, 2KA, 5KA, 10KA, 20KA, 25KA.
Selection of output voltages, the ranges are 1.25V, 2.5V,3.75V, 5.0V, 6V, 7.5V selection through switches.
Two operating modes are provided: PC & MANUAL.
12 Channels, Cr/Al type Thermocouple sensor for temperature sensing with PC datalogging.
Servo controlled mechanism for maintaining the Test Current at preset value in manual mode.
With PC Based Temperature Datalogger: i)Isolation Amplifiers – For 12 Channels ii)Thermocouple Sensor – 12 Nos. iii)Data Loading Facility on PC with USB Port.
Input Supply 415V AC 200A for two phases & 16A for Third phase.
Output – Single Phase 8V adjustable in steps with 3 Power Transformer and contactors.
Output Current – 100A to 10kA @ 8V and 25kA Short time
Constant current with the help of Servo Control – True RMS Sensing Servo Controller will be used to keep the current within +/- 1% of set value.
Current Measurement – Wound type bar primary CT with 200A, 500A, 1kA, 2kA, 5kA, 10kA, 20kA & 25A. Taps will be provided to measure & control the current accurately. The selection of CT range will be with Rotary Selector Switch and contactors.
Indication : a) Digital Voltmeter : For variac position 0 to 500V AC Accuracy Class 1. b) Digital Servo Controller : For test current which reads the value in terms of CT Range. 0 to 1.000 count of CT Range Accuracy Class 1. c) CT for current measurement with Accuracy Class 0.5, Burden 5VA. d) Shunt : 0.1 Ohms/50W for measurement of current on C.R.O.
Test ON/OFF, Reset, Emergency OFF Push Buttons. Protection : Over Current trip with 10sec. Delay. Mains ON/OFF with MCCB.
Panel will built in M.S. Fabricated trolley with powder coating of minimum 80 micron thickness. Suitable Nylon wheels will be provided for easy movement of trolley.
Digital Timer to Set ON time 0 to 99 Hours with alarm after end of test time
All the controls will be through PC. In PC mode & with switches in manual mode.
The maximum current rating, output voltage and number of temperature channels can be customized. Also the system is available with PC / PLC / manual operation
The system is used to measure the temperature rise values of current carrying and other parts in switchboards, breaker panels and high current circuit breakers as also fuse liks and holders that handle high current switching and distribution.
