relay protection pdf

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The Relay Testing Handbook: Principles and Practice

The Relay Testing Handbook is an indispensable resource that every relay tester should keep at their fingertips. This book was written for relay testers, rather than design engineers, so you no longer have to decipher engineering textbooks when performing relay tests.
As modern protective relays become increasingly more powerful and complex, many relay testers continue to use test procedures and philosophies that are based on previous generations of relays and their limitations. Modern relays have very different characteristics that require a different testing philosophy to ensure that they will operate when required.

This hardback book includes most of the volumes in the The Relay Testing Handbook series and includes:
* Electrical fundamentals including three-phase electricity, phasor diagrams, and fault types
* Relay testing fundamentals including what equipment you need and how to use it
* The most commonly used testing philosophies, and the most efficient and effective ones
* How to translate digital logic used by relay manufacturers into familiar concepts
* Best practices for creating and implementing test plans

Entire chapters are dedicated to the most commonly used protective elements including:
* Overvoltage, undervoltage, and frequency (59/27/81)
* Time, instantaneous, and directional overcurrent (51/50/67)
* Simple and transformer differential (87) testing with three or six current channels
* Line distance (21) testing using realistic test plans to minimize setting changes

Each protective element chapter includes:
* A description of operation written for a relay tester, not for a design engineer
* Step-by-step test techniques that maximize your effectiveness and efficiency
* Realistic examples from various relay manufacturers and models

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Price: $187.95


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Karen asked Can I use a 240v breaker with a 250v recepticle?

I have the following temperature controller: http://www.omega.com/manuals/manualpdf/M0531.pdf and I was wondering if I could use an 80a 120/240v breaker to run it. I'm not sure if the amperage rating is for 120v or 240v, either way I think it will suffice as I need 50a to run the "250v" recepticle. Thanks for the help. In response to dtsell: The controller unit says it requires 250v to operate, I want to know if 240v and 250v are the same thing. Also, the breaker I am looking at says it's rated for 80 amps, but it says it's rated for 120 and 240v, so I am unsure if it will provide 80 amps for both 120 and 240 volts.

And got the following answer:

First thing is that your controller will operate at either voltage. The controller will draw 0.025A at 240V, 0.050A at 120V. Read section 1.2 It is your output that can handle either 7 A at 120VAC to a Resistive load like a heater. 5A at 249VAC resistive or 50VA ( Watts) inductive, like a motor or contactor. This is also in Sec. 1.2 That comes out to about 0.21A at 240V or 0.4A at 120V. There is no need for this controller to have more than a 1Amp protection on either the supply line or the output relay. What size breaker you need for the device to be controlled depends on that device and whatever contactor you use. You will not be able to control a 50A receptacle with this unless you have some other contactor or relay rated for it. I believe you are interpreting 50VA as 50A. In which case you should have someone else do this. 50VA is Watts. Divide the 50VA by the voltage to get Amps. Edit: I do not see 250V anywhere in this manual. It clearly says it will operate at 120V or 240V. These are nominal voltages. Line voltage can range from 105-130 or 205-260.


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