Generator Protection

In Generator Protection, you'll learn ...

• The generator protection relay selection process necessary to protect against each fault type or abnormal condition
• How the position of an earth fault within the generator winding, as well as the grounding impedance, affects the level of short circuit current
• Generator protection relay types, settings and sensitivities
• How to prevent generator over speeding during shutdown

Overview

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Credit: 3 CPD

Length: 41 pages

This course was made as a reference guide for generator protection. Protection relays that are described in this course are applicable to one or more generator protection schemes. There are a number of protection relay types and those are used for protection against a wide variety of conditions. These protection relays protect the generator or prime mover from damage. Also they are used for protection of the external power system or the processes it supplies.

The basic principles that are described in this course apply equally to individual relays and to multifunction numeric relays. The protection engineer needs to balance the expense of using a particular relay against the consequences of losing a generator. The complete loss of a generator may not be catastrophic in the case it represents a small part of the investment in an installation. Nevertheless, the impact on service reliability and upset to loads has to be taken into consideration. Damage and loss of product in continuous processes can represent the ultimate concern rather than the generator unit. Therefore, there is no typical protection solution based on the power rating.

(Note that numbers shown in parenthesis throughout this course refer to protective device function numbering per ANSI/IEEE C37.2 “Electrical Power System Device Function Numbers, Acronyms, and Contact Designations”.)

This course is suitable for engineers with a desire to understand the fundamentals of generator protection. Presented details cover issues related to generator protection technical implementation. Upon successful completion engineers will be able to address key generator protection concepts, terms and characteristics.

Learning Objectives

Upon completion of this course, participants will be able to:

• Explain Earth Fault Protection (50/51-G/N, 27/59, 59N, 27-3N, 87N).
• Describe Phase Fault Protection (51, 51V, 87G).
• Identify Backup Remote Fault Detection (51V, 21).
• Analyze Reverse Power Protection (32).
• Assess Loss of Field Protection (40).
• Interpret Thermal Protection (49).
• Examine Fuse Loss Protection (60).
• Summarize Over-excitation and Over/Under-voltage Protection (24, 27/59).
• Relate Inadvertent Energization Protection (50IE, 67).
• Illustrate Negative Sequence Protection (46, 47).
• Evaluate Off-Frequency Operation Protection (81O/U).
• Verify Sync Check (25) and Auto Synchronizing (25A).
• Distinguish Out of Step Protection (78).
• Classify Selective and Sequential Tripping.
• Validate Synchronism check and auto synchronizing.

Certificate of Completion

You will be able to immediately print a certificate of completion after passing a multiple-choice quiz consisting of 30 questions. CPD credits are not awarded until the course is completed and quiz is passed.