hi to everybody,
I plan to install ac voltmeter and ammeter on a 3 phase, 3-wire main dist. panel using transformer rated current voltmeter and ammeter to monitor current (amps) demand on the system. Can anybody please direct me to a URL or links that has sample wiring diagrams showing the...
Hi to all!
We have a 500 KVAR Auto Correcting Capacitor consisting of 2 x 50 KVAR and 10 x 40 KVAR, 460 V, 3 phase, 60HZ. Five (5) of 12 switching contactors had contacts melted (some 2 poles melted, others 1 pole). Continuous current rating of the contactors is 80 amps at 460 V. The Cap Bank...
hi guys, i hope you can help me on this one. We have a 175 KVA, 480/240v, 3phase, 60 Hz. 65 degrees C rise, delta/wye neutral ungrounded dry type transformer with 15 % load and 40% unbalance. The unit is showing abnormal heating of 45 degrees C as shown by IR scan. Megger readings is 200 Megs...
To all of you
Wishing you a very Happy and Prosperous New Year! 2007 has been a good year and hope that 2008 will be even better.
More power to Engineering Tips and all forum participants
capuchi
How do you read the GE Electronic Digital type demand register kilowatt hour meter? We have GE Type VS-63, Model FM-9A kwhr meter but at a loss in reading the different data flashing on the display. Can anybody lead me to a website where we can download instruction manual on these type of...
Hi, we have a 2000KVA delta-wye 23KV/460V Oil filled transformer (T-1) feeding a 225KVA, delta-wye 460V/230V transformer (T-2) inturn feeding 3phase air conditioning equipment and lighting. Our cables and wires are color coded right from the LV side of T-2 up to the downstream panelboards'...
hi guys,
We have two brand new, dry type to be put on service. T-1 is a 750 KVA and T-2 is a 500 KVA. Both are 460/230 Volts, 3 phase delta –Y. Using a 1000V megger, the insulation resistance rdg of T-1 are : Pri-Grnd= 160, Pri-Sec=259 and Sec-Grnd=158; while the T-2 has Pri-Grnd=2.86...
we have a new 175 KVA, 460/230volts, 3ph dry type transformer. following NEC art. 450 the primary side protection would be 600Amps while the secondary side would be 500Amps. Am I correct in my interpretation of art. 450? Also, would you rather recommend a fuse than a CB. Can someone pls advise...
