Looking for installation of batteries in industries for UPS application and in electrical substation for back up power. Would like to know what types of batteries are installed / recommended to use in industrial UPS application and in electrical substation back up control power. What is the %...
Quick question - by any chance your cable gland ground connection pass through CBCT? This can cause tripping. See the image below. Ensure correct installation.
Powerykh, CTs installed in bushings and used for winding temperature indicator has very typical rations based on selection of WTI. If you know check the ratings of WTI installed, it will specify how much current is required for biasing of Oil temperature reading at rated capacity of the...
@Bill - Great explanation and information.
@Mr.Ohm aye God
I believe that you want to measure the motor parameters (resistance / impedance / reactance) and IR when motor is dead but motor cable remains connected. You are measuring at motor terminal with cables connected. In this condition...
Dear All,
We are doing the M-Pact (Old one - GEC ALSTOM manufactured, not GE manufactured) CBs refurbishment and understand that the MPro relays were supplied with CTs installed on these breaker mounting. The CTs are Rogowski type (flexible type). I cannot find any details of these CTs...
Quote:
In the above scenario with no generator on frequency control, how is the grid frequency controlled at 50Hz?
Based on information given, it is assumed that STG when running is not synchronized with grid essentially, this is islanding mode of operation. It is assumed that DG set are...
RRaghunath,
Thanks for your comments and information shared. I agree with your comments. The motors are not protected by IED and hence do not have auto restart function that can be distributed over the time.
Aussiejohn2,
Per consultants, 1.2 Seconds is the constant from the motor data...
Muthu,
Thanks for the advice. My experience in practice is different from this. Motor starting currents are less if motor is restarted when it is already rotating.
Che12345,
A1. The correct relay type is TF42. Regret for typo error and confusion created.
A2. TF42 is Class 10 relay...
Dear Scotty UK,
This is process plant and most of the motors are driving centrifugal pumps. Very few are driving the fans. I agree with you that 900% of start up current is pretty high assumption.
Dear RRaghunath,
Thanks for sharing your though and information. I tried to look for the motor...
The plant motors are supplied from MCC that has two incomers, two bus sections and bus coupler. MCC incomers has changeover scheme - in the event of any one of the incomer opening on under voltage, respective incomer will open, allow faulty bus voltage to drop below 35% and then close bus...
Dear ScottyUK,
Thanks for information and suggestion. What I know is Comeca still manufactures the Galaxis switchboards. But they are based in France. The project I am working with was from UK factory. Besides, CB as product did not went to them.
Dear All,
I am looking for Alsthom UK manufactured MP42W circuit breaker manuals and installation drawings. These circuit breakers were manufactured in Alsthom UK factory and were parts of Galaxis swithgear.
I know that these breakers were taken over by GE (Now ABB). I have tried with GE...
Diagram 1 -
1) Arrow through Star (Y) ==> This indicate Tap Changer - Depending on application, You can vary the voltage
2) Lines below Delta (D) ==> This indicates Delta side winding is connected to switchgear (or where ever connection lead to) is through busbuct.
2) Diagram 2
1) Line...
To clarify my understanding, The relay has capacity to interrupt the 7A at 24 V DC. What is the maximum current that relay can interrupt without any safety risk at 125V DC? If this is correct, may be relay catalogue should have answer. If not, need to contact OEM.
NC
Here I got the link ..
http://digital.lib.uiowa.edu/cdm/ref/collection/uidb/id/10896
From one of the old threads on the sites....
Thank you Experts and sharing the knowledge!!
NC
In addition to the suggestions from electricpete - has anything changed for shaft earthing? It is Gas Turbine Generator - so i believe one bearing is insulated and shaft earthing is provided. Is there any change in shaft grounding brushes or currents?
Have experienced similar problem for...
You can easily control the pressure and flow pattern by shape and size of the nozzle. With generator, one or two pump and array of solenoids for ON / OFF control, what you will have is single header with constant pressure. In order to make fountain dance you need nozzle of different size and...
