IEEE C37.96 1989

$69.88

IEEE Guide for AC Motor Protection

Published By	Publication Date	Number of Pages
IEEE	1989	70

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Description

Revision Standard – Inactive – Withdrawn. Guidance in applying relay protection to squirrel-cage and wound-rotor induction motors and synchronous motors is provided. The generally accepted forms of motor protection are reviewed, and the use of relays and devices, singly and in combination, is summarized so that the user can select the necessary equipment to obtain adequate motor protection. This guide is concerned primarily with the protection of three-phase integral horsepower motors and variable-speed motors where specifically indicated. It does not detail the protective requirements of all motors in every situation. The recommendations are of a general nature, designed to cover the usual or typical motor installations.

PDF Catalog

PDF Pages	PDF Title
11	1 Introduction 1.1 General Format 1.2 Motor Description 1.2.1 Induction Motors 1.2.2 Synchronous Motors
12	1.3 Switching and Control AC Line-Interrupting Control Devices Switchgear-Type Motor Controllers
13	1.3.3 Field Switching Equipment 1.4 Effect of AC and DC Control Equipment 1.4.1 Stator-Control Equipment Three-Wire Control Circuit with Loss of Voltage Protection Three-Wire Control Circuit with Time-Delay Loss of Voltage Protection
14	1.4.2 Field-Control Equipment Two-Wire Control Circuit with Loss of Voltage Release
15	Typical Brush-Type Synchronous-Motor Control
16	1.5 References Typical Brushless-Type Synchronous-Motor Control
17	1.6 Applicable Documents in Preparation 2 Motor Protection Requirements 2.1 Pullout Protection 2.1.1 Induction-Motor Stalling 2.1.2 Synchronous-Motor Pullout 2.1.3 Electrical Quantities Available for Detection 2.1.4 Protective Devices
18	2.2 Stator Winding Protection 2.2.1 General 2.2.2 Motor Overloading Devices and OS HA
19	2.2.4 Inadequate Ventilation 2.2.5 Unusual Ambient Conditions
20	High and Low Voltage and Frequency
21	2.2.7 Locked Rotor or Failure to Accelerate Typical Motor Starting and Capability Curves
23	Frequent Starting or Intermittent Operation Typical Time-Current and Thermal Limit Curves
25	Overtemperature Thermal Protective Devices
27	2.2.10 Current-Sensing Type Devices
29	2.3 Rotor Thermal Protection 2.4 Stator Fault Protection 2.4.1 General Considerations Effects of System and Motor Characteristics
30	2.4.3 Phase-Overcurrent Protection 2.4.4 Negative-Sequence Protection 2.4.5 Ground-Fault Protection
31	2.4.6 System-Ground Protection Toroidal (CT) Current Transformer; Cable Sheath Grounding
32	2.4.7 Differential Protection System
33	Differential Protection of Motors (a) Wye-Connected Motor (b) Delta-Connected Motor Flux-Balancing Current Differential Scheme
34	2.5 Rotor-Fault Protection 2.5.1 Induction-Motor Protection 2.5.2 Synchronous-Motor Protection Differential Protection of Split-Phase Wye-Connected Motor Alternate Method for Split-Phase Differential Protection Sensitive Differential Protection with Directional Ground Relay
35	Wound-Rotor Motor Rotor Ground Protection Ground-Detection Lamps
36	2.6 Bearing Protection 2.6.1 General AC Ground Detection DC Ground Detection
37	Antifriction Ball, Roller) Bearings Fluid-Film (Sleeve) Bearings 2.6.4 Bearing Failure 2.6.5 Protection
38	2.7 Abnormal Power Supply Conditions 2.7.1 Abnormal Voltage
40	Current in Motor Windings with One Phase Open Circuited; Wye-Connected Motor Connection of Sequence Networks for Open-Phase Condition Sequence Currents for Open-Phase Supply to Motor
42	2.7.2 Abnormal Frequency Abnormal Operating Conditions 2.8.1 Incomplete-Starting-Sequence Protection 2.8.2 Out-of-Phase Re-Energization Protection
43	2.9 Surge Protection 2.10 Motors or Motor Controls Used in Class 1E Nuclear Exposure 3 Motor-Protection Specifications 3.1 General Considerations 3.2 Motor-Protection Tables
44	Low-Voltage Motor Controller Breaker or Fused Disconnect and a Magnetic Contactor with an Overload Relay
45	Class El High-Voltage Motor Controller Class E2 High-Voltage Motor Controller High-Voltage Class E Motor Controller
46	Low-Voltage Power Circuit-Breaker with Series Trip Device Trip Device
47	Low-Voltage Power Circuit-Breaker with Protective Relays Addition to or in Place of Series Overcurrent Devices
48	Power Circuit-Breaker Motor Controller Typical Protection Large Motors
49	Power Circuit Breaker Field-Excitation Protection for all Synchronous Motor Controllers
50	Device Designations and Functions
51	Variable-Speed Motor-Protection Table Two-Speed Motor Protection
52	Variable Speed Motor Protection Variable Speed Motor Protection
53	4 Setting and djustment of Protective Devices 4.1 Genttral Discussion Protective Device Settings Device 13-Synchronous-Speed Device Device 21 -Distance (Impedance) Relay Variable Speed Motor Protection
54	Device 26 -Field Thermal Device Device 27 – Undervoltage Relay Locked-Rotor Protection with Impedance Relay
55	Device 40 -Field Relay Device 46- Reverse-Phase or Phase-Balance Current Relay Device 47 – Phase-Sequence Voltage Relay
56	Device 48 -Incomplete Sequence Relay Device 49 – Machine Thermal Relay Correction Factors for Motor Full Load Currents
57	4.2.10 Device 50/51 -Fuses and Overcurrent Devices
58	Typical Setting of 50/51 Overcurrent Relays
59	Typical Setting at 50/51 Overcurrent Relays with Separate Time Delayed Instantaneous Complete Overcurrent Protection Characteristics
60	Typical Setting of 50/51 when 50 Supervises
62	4.2.1 1 Device 53 -Exciter or DC Generator Relay 4.2.12 Device 55 – Power-Factor Relay 4.2.13 Device 56 – Field Application Relay 4.2.14 Device 60-Voltage or Current Balance Relay 4.2.1 5 Device 81 – Frequency Relay 4.2.1 6 Device 86 – Lockout Relay
63	4.2.17 Device 87-Differential Protective Relay 5 Bibliography Induction Motors General
64	Synchronous Motors General
65	Variable Speed Applications
66	Protective Relays and Settings General
67	5.5 Protection Thermal 5.6 Protection Fault
68	Protection Against Abnormal Conditions 5.8 Protection Surge
69	Miscellaneous Bearings Capacitors Bus Transfer etc 5.10 Standard Publications