Course description
Protective relays are decision-making elements in the protection scheme for electrical power systems. They monitor circuit conditions and initiate protective action when an undesired condition is detected.
Any facility with generating capability, and that is generating into the power grid, is subject to regulation by NERC, the North American Electric Reliability Council and their Standard PRC-005-1b — Transmission and Generation Protection System Maintenance and Testing as internal system faults can affect the grid.
Protective relaying serves many functions including isolating faulted circuits or equipment from the remainder of the system so the system can continue to function, limiting damage to faulted equipment, minimizing the possibility of fire or damage to adjacent equipment, and minimizing hazards to personnel.
When they are required to operate because of a faulted or undesirable condition, it is imperative that protective relays function correctly. A strong maintenance and test program will keep your protective relays in a high state of readiness ensuring they respond properly to normal and abnormal conditions and help you avoid equipment damage, prolonged downtime and employee injuries.
This 5 day course is 80% hands-on and will be customized to your electrical system and will provide your protection and control technicians with the skills to maintain and test your relays.
Upcoming start dates
Training content
I. Electrical System Protection Requirements
Objective: Relate the requirement for accurate relay calibration to the requirements of the electrical system
- Electrical Code Requirements
- NERC - North American Electric Reliability Council Requirements
II. Client Protection System Design
Objective: Describe how protective relays protect your electrical system
- Typical AC 3 Line Schematics
- Typical DC Schematics
- Client Single Line
- Generator Protection
- Transformer Protection
- Feeder Protection
- Bus Protection
- Motor Protection
III. Protective Device Coordination
Objective: Demonstrate the requirement to coordinate protective devices
- Time Current Plots
- Damage Curves
- Characteristic Curves
- Discrimination
- Selectivity
- Coordination
IV. Calculations
Objective: Perform electrical fault calculations
- Full Load Currents
- Basic Short Circuit
V. Instrument Transformers
Objective: Test the instrument transformers that connect the power system to the protective relay
- Current Transformers
- Potential Transformers
VI. Protective Relay Description
Objective: Describe the component parts and their purpose in a protective relay
- Purpose of Protective Relaying
- General Overview
- Relay Classifications
- Device Function Numbers
VII. Basic Construction and Operating Principles
Objective: Explain the construction and operation of a protective relay
- Electrical Subassemblies
- Electromechanical Protective Relay Construction
- Design Requirements
VIII. Types of Protective Relays - Application and Operation
Objective: Describe the different types of protective relay and how they operate
- Distance Relays (21)
- Synchronising and Synchronism Check Relays (25)
- Undervoltage Relays (27)
- Directional Power Relays (32)
- Loss of Excitation (Field) Relays (40)
- Phase - Balance Current Relays (46)
- Phase - Sequence Voltage Relays (47)
- Thermal Relays (49)
- Time - Overcurrent and Instantaneous Overcurrent Relays (50/51)
- Overvoltage Relays (59)
- Voltage Balance Relays (60)
- Pressure Relays (63)
- Directional Overcurrent Relays (67)
- Frequency Relays (81)
- Lockout Relays (86)
- Differential Relays (87)
- Pilot Wire Relays (87L)
- Sudden Pressure Relay
- Bucholz Relay
IX. Protective Relay Degradation and Failure Modes
Objective: Describe failure modes of protective relays
- Aging and Degradation Mechanisms
- Failure Modes
- Reliability and Failure Information
X. Recommended Maintenance Practices
Objective: Perform maintenance on protective relays
- Background Information
- Classification of Maintenance
- Overview of Protective Relay Checks, Inspections and Tests
- Determining Maintenance Intervals
- Summary of Recommended Practices
XI. Mechanical Inspections and Checks
Objective: Perform mechanical inspections and check on protective relays
- Preparation
- Removing a Protective Relay from Service
- Visual Inspection and Cleaning
- Mechanical Checks and Adjustments
- Functional Check
XII. Electrical Tests and Calibration
Objective: Test and calibrate protective relays
- Test Preparation
- Insulation Resistance Test
- Induction Disk Pickup (or Dropout) Test
- Induction Unit Timing Test
- Indicating Contactor Switch (Seal-In ) Pickup and Dropout Test
- Instantaneous Unit Pickup Test and Calibration
- Slope Test
- Angle of Maximum Torque Test
- Reach Test
- Offset Test
- Induction Unit Control Test
- Through Fault Test
- Induction Unit Calibration
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Canada Training Group
Canada Training Group stands as a premier provider of industrial electrical safety and technical training. With over 40 years of expertise, we specialize in delivering comprehensive, results-oriented training programs designed to enhance safety, productivity, and efficiency across various industries. Our...