Relay Protection Coordination

DESCRIPTION A relay is a device which is operated by a variation in its electrical or physical conditions to effect the operation of other devices in an electric circuit. A protective relay is a relay, the principal function of which is to protect service from interruption or to prevent or limit damage to apparatus. In electrical engineering, a protective relay is a device designed to trip a circuit breaker when a fault is detected. The first protective relays were electromagnetic devices, relying on coils operating on moving parts to provide detection of abnormal operating conditions such as over-current, over-voltage, reverse power flow, over- and under- frequency. The theory and application of these protective devices is an important part of the education of an electrical engineer who specializes in power systems. The need to act quickly to protect circuits and equipment as well as the general public often requires protective relays to respond and trip a breaker within a few thousandths of a second. In this course, we gonna learn about :

• Identify the Effects of Current Transformers (CTs) on Power Systems Protection.
• Recognize Protective Relay Coordination Related Disturbances and Outages.
• Collect the Required Data to Perform a Detailed Coordination Study.
• Derive Complete Protective Relay Device Settings to Protect the Electrical Power Systems Equipment.

  MATERI 1. System Analysis

• Fault Current and Load Flow Calculations Using Computer Software
• Remote Effects Of Faults

2. Protective Device Coordination Principles

• Graphical Tools and Time/Current Curve Interpretation
• Load Flow and Unbalanced Fault Effects
• Cold Load Pickup
• Grounding System Constraints
• Coordination Economics
• Asymmetrical Current Impacts
• Coordination Time Intervals of Relays
• Transformer Effects on Coordination

3. Equipment and Device Characteristics

• Fuses –including current limiting fuses
• Molded case and Insulated Case Breakers
• Solid-State Trip Low Voltage Breakers
• Equipment Damage Characteristics
• Proper Protective Device Selection
• Circuit Breaker Ratings and Selection
• Low Voltage Cable Protection
• Shielded Cable Protection
• Overhead Conductor Protection
• Motor Protection
• Generator Protection
• Transformer Protection
•  Panelboard and Switchgear Protection
• Inverse Time/Overcurrent Protective Relays and
• Instantaneous Trip Devices
• Series Rated Breakers
• Differential and Voltage Constrained Relays
• Reclosing relays, reclosers, and sectionalizers
• Current transformer characteristics and selection

4. Ground Fault Protection

• Arcing Ground Fault Magnitudes
• Ground Fault Protection Schemes
• Interaction Of Ground Fault Relays And Phase
• Overcurrent Devices

5. Emergency Power System Design

• Weak Source Systems
•  Generator Fault Characteristics
• Uninterruptible Power Supply Fault Characteristics
• Transfer and Static Switch Limitations
•  Improving Emergency Circuit Design

6. Common Coordination Problems, Errors, And Misconceptions 7. Preliminary System One-line Development for a Coordinated System

• Lessons Learned and “ Rules of Thumb” to spot uncoordinated systems and methods to develop a coordinated system design

8. Criteria Impacting Coordination

• NESC, IEEE Std C2,
• NFPA 70-National Electrical Code
• Arc Flash Protection of Employees

9. Switchgear And Relay Commissioning Including Optional Hands-On Student Calibration of a Relay   PARTICIPANTS Consultants, application engineers, design engineers and electrical engineers from large industrial plants or municipal distribution systems with complex protective relay needs will find this course highly beneficial. TRAINING METHOD Presentation Discussion Case Study Evaluation   FACILITY Training Kit Handout Certificate Lunch + 2x Coffee Break Souvenir Pick Up Participant (Yogyakarta)