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- Isolating Line protection
  
  P&C / Relay Testing Talk 0
  
  What sequence do you all use when isolating line protection. I isolate trips, pull comm, inputs, pots and then current. I know of a couple guys that go in a...
  
  Last post by Js20981 3 Days Ago
- What are the magnitude and direction?
  
  NETA Level 3 Exam 5
  
  If a = (5, -12), what are the magnitude and direction of a? The above question marked me wrong I answered: (13, 292.6°) I double checked this online...
  
  Last post by Uguessus 6 Days Ago
- Percentage Differential Mismatch
  
  NETA Level 4 Exam 2
  
  Calculate the percentage differential mismatch for an electromechanical relay protecting a 138kV-69kV Delta-Wye 50MVA Transformer with 250:5 CTs on the primary...
  
  Last post by Uguessus 1 Week Ago
- Shorting transformer windings for PI, why is it done?
  
  Electrical Testing Talk 28
  
  Had an interesting discussion on the job today about shorting together transformer windings when doing a PI test. Every technical manual I've come across tells...
  
  Last post by LHammermeister 1 Week Ago
- VCB with high DLRO reading
  
  Electrical Testing Talk 3
  
  Good day everyone. I was task to check a 12kV 800A vacuum circuit breaker for 4.16kV application. As part of pre-requisite prior to accepting the item as...
  
  Last post by gasman 1 Week Ago
More topics: Electrical Testing Talk | Relay Testing Talk | Safety & Arc-Flash | NETA Exam Prep | NICET Certification Talk
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Technical Articles
- Motor Nameplate and Ratings Explained
  
  We explain the markings found in NEC along with other common terms and ratings included on motor nameplates. Continue Reading
  
  Posted By testguy August 30, 2020
- Electrical Drawings and Schematics Overview
  
  Designing, installing, and troubleshooting of electrical systems requires the use of various drawings to give engineers, installers, and technicians a visual representation of the systems they work... Continue Reading
  
  Posted By testguy July 19, 2020
- Insulating Liquids: Basic Properties, Types and Applications Explained
  
  Fluid inside electrical apparatus is the lifeblood that serves both as a dielectric and a cooling medium. Continue Reading
  
  Posted By testguy June 25, 2020
- 4 Critical Tests for Evaluating HV Circuit Breaker Performance
  
  Regardless of the breaker type, its important to test their components regularly to help ensure proper operation in case of a system fault or switching operation. Continue Reading
  
  Posted By testguy March 9, 2020
- Power Quality Analysis: Basic Theory and Applications Explained
  
  There is no such thing as perfect power quality in the real world. Service interruptions, equipment malfunction, and excess power consumption are all common symptoms of poor power quality. Continue Reading
  
  Posted By testguy November 23, 2019
- Magnetron Atmospheric Condition (MAC) Testing Principles
  
  Unlike the hipot test, testing vacuum interrupters utilizing magnetron atmospheric condition (MAC) principles can provide a viable means for determining the condition of vacuum interrupters prior to... Continue Reading
  
  Posted By testguy September 15, 2019
- Electrical Power System Studies Explained
  
  There are many different types of power system study, each with their own special purpose and calculation method. Each analysis is unique to a particular power system, any changes within the system... Continue Reading
  
  Posted By testguy August 9, 2019
- Power Distribution Unit (PDU) Applications, Testing & Maintenance
  
  Traditional data center power distribution designs consist of multiple PDUs delivering power to remote power panels (RPPs) throughout the building, which in turn deliver power to network hardware... Continue Reading
  
  Posted By testguy May 26, 2019
- Network Protector Basics: Applications, Operation, and Testing
  
  This guide covers network protector basic operation and maintenance procedures. Continue Reading
  
  Posted By testguy April 19, 2019
- Infrared Thermography for Electrical Distribution Systems
  
  This guide provides a basic overview of the theory and procedures involved with infrared scanning electrical distribution systems. Continue Reading
  
  Posted By testguy December 22, 2018
- Protective Relay Testing and Maintenance Overview
  
  A comprehensive overview of inspection and test procedures for protective relays in electrical power systems. Continue Reading
  
  Posted By testguy November 22, 2018
More Technical Articles...
Popular on TestGuy
- What’s the best way to operate power dB
  
  Electrical Testing Talk 14
  
  What do you guys use for computers and the best way to set up power dB without failing? Operating this system is awesome...when it works. Either having...
  
  Last post by Nick1234 January 20, 2020
- NETA Governance
  
  Electrical Testing Talk 11
  
  I think NETA is influenced by some specific testing companies. Also they govern NETA test. Who will agree with this?
  
  Last post by southbury September 5, 2020
- Number of cycles completed in one second
  
  NETA Level 2 Exam 11
  
  2. The number of cycles completed in one second is called the Your Answer: hertz marked incorrect Hertz — A unit of measure for frequency. Replacing the...
  
  Last post by Kxmaart August 7, 2020
- NETA III Test Feb 2020
  
  NETA Level 3 Exam 10
  
  I would say about 25% of the questions on the exam were on this forum.
  
  Last post by clipboardwarrior March 19, 2020
- Can this CT produce enough voltage to trip a relay?
  
  NETA Level 4 Exam 9
  
  I think yes. 100ft x .0025ohm/ft = 0.25ohm < .9ohm so its ok.
  
  Last post by zslater August 28, 2020
- Surge arrester testing(34.5kv, 161kv, 330kv)
  
  Electrical Testing Talk 8
  
  What's the appropriate test can I perform on my surge arrester(Lighting arrester) both polymer and porcelain type. Assist me with drawings/sketches of the test...
  
  Last post by backpack96 3 Weeks Ago
- Omicron Test Equipment vs Others
  
  Electrical Testing Talk 8
  
  I've recently went and visited an Omicron facility in Houston. We went for the line impedance testing abilities, but while we were there I was able to ask...
  
  Last post by amlawren April 3, 2020
- Doble Testing a Bushing: C2 reading higher than nameplate
  
  Electrical Testing Talk 8
  
  Does anyone have an explanation for high C2 readings when Doble testing transformer bushings? The test was on a three winding transformer. All C2 values...
  
  Last post by amlawren April 2, 2020
More topics: Electrical Testing Talk | Relay Testing Talk | Safety & Arc-Flash | NETA Exam Prep | NICET Certification Talk
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Certification Forum
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4. NICET Electrical Power Testing
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What sequence do you all use when isolating line protection. I isolate trips, pull comm, inputs, pots and then current. I know of a couple guys that go in a...

If a = (5, -12), what are the magnitude and direction of a? The above question marked me wrong I answered: (13, 292.6°) I double checked this online...

Calculate the percentage differential mismatch for an electromechanical relay protecting a 138kV-69kV Delta-Wye 50MVA Transformer with 250:5 CTs on the primary...

Had an interesting discussion on the job today about shorting together transformer windings when doing a PI test. Every technical manual I've come across tells...

Good day everyone. I was task to check a 12kV 800A vacuum circuit breaker for 4.16kV application. As part of pre-requisite prior to accepting the item as...

What do you guys use for computers and the best way to set up power dB without failing? Operating this system is awesome...when it works. Either having...

I think NETA is influenced by some specific testing companies. Also they govern NETA test. Who will agree with this?

2. The number of cycles completed in one second is called the Your Answer: hertz marked incorrect Hertz — A unit of measure for frequency. Replacing the...

I would say about 25% of the questions on the exam were on this forum.

I think yes. 100ft x .0025ohm/ft = 0.25ohm < .9ohm so its ok.

What's the appropriate test can I perform on my surge arrester(Lighting arrester) both polymer and porcelain type. Assist me with drawings/sketches of the test...

I've recently went and visited an Omicron facility in Houston. We went for the line impedance testing abilities, but while we were there I was able to ask...

Does anyone have an explanation for high C2 readings when Doble testing transformer bushings? The test was on a three winding transformer. All C2 values...

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