New Jersey 2102 - Types of Protective Relays

2102 - Types of Protective Relays

85.00 85.00

  • Course Delivery: On Demand
  • Duration: 4 


The objectives of this module is to demonstrate the operation of the most common types of protective relay. This in turn will prepare the participant for succeeding modules which deal with protective schemes often using a combination of these relays. After study of this module, the participants should be able to understand the following overall concepts and apply them to their day-to-day work activities. They will also be able to answer related test questions on these subjects: Components of the differential relay, Where differential protection is applied, The differential principle - bus protection, Transformer differential protection, Restraint and harmonic restraint, Components of the overcurrent relay, Instantaneous overcurrent protection, Time-over current protection, Adjustment of pick-up and time dial, Construction of directional relays, The need for directional elements, Operation of directional relays, The induction cylinder relay, Operation of distance relays - balanced beam and MHO type, Circle diagrams, Effect of load impedance, Three-zone elements; back-up protection.

If you are taking this course for NERC credit, the following credits will be reported.

NERC CE HOURS: CE HOURS = 4.00 OPS Topics=4.00 Standards=0.00 Simulation=0.00 EO=0.00


Course Objectives

Learning Objectives:
- Trainees will be able to explain the principle of differential protection and describe where this type of protection is typically employed.
- Trainees will be able to describe the features of the differential relay.
- Trainees will be able to describe features and functions of typical instantaneous and inverse time overcurrent relays
- Trainees will be able to describe different types of inverse time characteristics for inverse time overcurrent relays
- Trainees will be able to explain why directional relays are needed and be able to describe a typical installation
- Trainees will be able to explain the concept of measuring impedance to detect power system faults
- Trainees will be able to describe the operation of the balanced beam type of relay, as well as some of its limitations
- Trainees will be able to describe the characteristics of a MHO relay and be able to explain its operation
- Trainees will be able to explain the importance of back-up protection and be able to describe common techniques used to implement it


Topics Covered

Segment A-1: Transformer insulating oil testingSegment A-2: Insulation oil samplingSegment A-3: Aging of transformer and insulating oilSegment A-4: Transformer fault conditions and gasesSegment A-5: Interpretation of fault gas analysisSegment B-1: Dielectric strength and water content testingSegment B-2: Oil acidity testingSegment B-3: Other oil testsSegmant C-1: Closed cycle lubricating systemsSegment C-2: Liquid viscositySegment C-3: Oil oxidationSegment C-4: Contamination test techniques 1Segment C-5: Contamination test technique 2Segment D-1: Monitoring water systemsSegment D-2: Water system corosionSegment D-3: Suspended and disolved solids in water systems





End of Course Instructions

Congratulations on completing the course! Your credits earned on completion of this program will be reported to within 30 days of completion. Once we report your completion at, you will receive a certificate of completion provided by RCEP on the email address you have provided at the time of enrollment. Please keep the certificate for your record. You may be required to submit this certificate to the state to record your PDH or present it in case if you are audited. If you have any questions or concerns please contact customer service at



After completing this course the final exam must be passed with a 70% or higher in order to receive certificate of completion.


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