The ONLY Relay Testing Book Written FOR Relay Testers

The Relay Testing Handbook gives you:  

  • A career's worth of relay testing experience you can carry with you on the job. 
  • Information to test any protective relay, create your own test plans, and perform tests in the field, regardless of manufacturer. 

Relay Testing Can Be Frustrating

a relay test frustrated becuase they DON'T have our Relay Testing Book

If you’ve spent any amount of time out in the field testing relays, you already know a few things:

  • Every manufacturer has their own standards, symbols, and terminology. They use different diagrams, different labeling…  All that means is A LOT OF TIME spent studying manuals, and A LOT OF TIME troubleshooting.
  • Every job is different. Virtually every testing job will, in some way, ask you to do something you have no idea how to do. This is stressful, frustrating, and time consuming. 
  • Modern relays have a staggering amount of functionality. This means they can do a lot more… but it also means there is a lot more to test as you try to sort through the mess of screens, menus, and options to find what you’re looking for.

You're Not Alone!

Most Relay Testers Struggle to Get the Job Done...

Without proper training, you have probably created a few workarounds over time to help you get by, or relied on automated test software. But that approach only gets you so far, because:

  • Protective relays are more powerful and more complex than they used to be. Relay testing technicians require a broader knowledge base to do their jobs efficiently and effectively.
  • Most electrical books are written by engineers who focus on electrical THEORY, and completely neglect the part you need: PRACTICAL APPLICATIONS.
  • You think you’ve hacked the system and figured out a solution, but it only works on THAT relay with its specific settings. Your new hack often doesn’t work on the next relay.
A Relay Tester Trying to Solve a problem

Take a look inside The Relay Testing Handbook...

Our relay testing books show you...
  • Basic electrical and relay testing fundamentals that set the foundation for everything you test, day in and day out.
  • How to handle the most common protection elements (50/51/67/27/59/81/21/87).
  • Step-by-step test plans with real-world applications, designed to get you USING what you learn as quickly as possible.
  • Breakdowns of the different relay testing approaches you can choose from, and how to select the best one for the job.
  • Tips, tricks, and troubleshooting instructions to overcome common testing problems.
  • How to apply the material to virtually any test equipment, with examples from multiple manufacturers and test-set models.
  • And much, much more…
  • Simplified Motor Relay testing
  • Generator Relay Protection Testing

The Relay Testing Handbook: Generator Relay Protection Testing

If you have ever performed generator relay testing, you know that there are many different elements with different operating characteristics. This can be a hard code to crack, even for experienced relay testers. But once you’ve learned how to solve the puzzle, you can confidently test any generator relay.

Understanding how a generator relay operates in the real world is the key to easy and effective generator relay testing. These chapters will help you understand the basics of generator protection:

  • Introduction to Generators
  • Generator Control Systems and Generator Diagrams
  • Getting Ready to Test and Element Testing Principles
  • How to Perform Acceptance, Commissioning, and Maintenance Tests [PDF Only]

Once you understand generator and relay testing theory, these chapters will show you universal, step-by-step test procedures for each element using modern, dynamic testing techniques:

  • Phase Distance (21)
  • Volts/Hz (V/Hz)/Over-Excitation (24)
  • Synchronizing and Synch-Check (25) [PDF Only]
  • Under-Voltage (27)
  • 100% Stator Earth (27TN/64G2)
  • Reverse/Under-Power (32)
  • Loss of Field/Field Failure (40)
  • Negative Sequence Over-Current (46)
  • Breaker Failure (50BF)
  • Inadvertent Energizing (50/27)
  • Voltage Control/Restraint Over-Current (51V)
  • Neutral Over-Voltage (59N/64G)
  • Fuse Loss/Failure (60FL)
  • Out-of-Step (78)
  • Under/Over Frequency (81)
  • Undercurrent/Load Loss/Underpower (37)
  • Undervoltage/Overvoltage (27/59)
  • Under/Over Frequency (81)
  • Phase Differential (87)
The Relay Testing Handbook-Testing Generator Protective Relays Cover

"I lacked experience with generator relays and the combination of hands-on testing and theoretical knowledge about the elements in test created a seamless transition from the classroom to the field. Outstanding professor with many ways to explain the same thing."

Frank Gonzalez


"Valence Electrical Training Services instructors break every generator protection element down into manageable sections."

Jeff Loy


Whether you’re just getting started with generator relay testing or have been frustrated by puzzling through the different elements and operating characteristics, this book will help you take your relay testing skills to the next level.

The PDF version has over 1,000 pages of content. The print version has been condensed to 800 pages to meet printer requirements. You get instant access to the PDF version if you order the print version.

Create Your own Relay Testing Handbook Library

Choose which versions will help you finish your next relay testing job and

receive a discount when you buy more than one today!

I Need Physical Books with PDFs

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Click the Add to Cart Button after you choose the combination of physical books that work for you.

You'll be able to download PDF copies of the books immediately after your order is complete and we'll ship your physical copies.

Product Quantity

Add Principles and Practice
(650+ page Hardcover and PDF)

Add Simplified Motor Relay Testing
(400+ page Hardcover and PDF)

Add End-to-End Testing
(82 page Paperback and PDF)

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I Only Need Digital PDF Downloads

Use the checkboxes below to choose the digital books you want from The Relay Testing Handbook series.

You can see your automatic discount below your choices.

Click the Add to Cart Button after you choose the combination of digital books that work for you.

You'll be able to download PDF copies of the books immediately after your order is complete.

Product Quantity

Add Principles and Practice
(650+ page PDF)

Add Simplified Motor Relay Testing
(400+ page PDF)

Add End-to-End Testing
(82 page PDF)

Quantity discounts
1-5 -0%
6-10 -10%
11-20 -15%
21-50 -20%
51+ -30%


We are so confident in The Relay Testing Handbook, we offer a 100% money-back guarantee, no questions asked.

Use the relay testing books, apply them to your current relay testing work, and if at any point you aren’t satisfied, send them back and we’ll issue you a complete refund.


Here are answers to some frequently asked questions:

Which brands and types of relays are covered in the relay testing books?

Do the handbooks cover anything about electro-mechanical relays?

I'm an electrician, relay tech, engineer... are these relay testing books right for me?

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