INSTRUCTION MANUAL MOTOR PROTECTION RELAY GRE120 .INSTRUCTION MANUAL MOTOR PROTECTION RELAY ... 2.2.3 CT Wiring and Setting of earth fault detection 23 ... Relay Setting Sheet

  • View
    259

  • Download
    8

Embed Size (px)

Text of INSTRUCTION MANUAL MOTOR PROTECTION RELAY GRE120 .INSTRUCTION MANUAL MOTOR PROTECTION RELAY ......

  • 6 F 2 T 0 1 7 4

    INSTRUCTION MANUAL

    MOTOR PROTECTION RELAY

    GRE120

    TOSHIBA Corporation 2010 All Rights Reserved.

    ( Ver. 3.0)

  • 1

    6 F 2 T 0 1 7 4

    Safety Precautions Before using this product, please read this chapter carefully.

    This chapter describes the safety precautions recommended when using the GRE120. Before installing and using the equipment, this chapter must be thoroughly read and understood.

    Explanation of symbols used Signal words such as DANGER, WARNING, and two kinds of CAUTION, will be followed by important safety information that must be carefully reviewed.

    Indicates an imminently hazardous situation which will result in death or serious injury if you do not follow the instructions.

    Indicates a potentially hazardous situation which could result in death or serious injury if you do not follow the instructions.

    CAUTION Indicates a potentially hazardous situation which if not avoided, may result in minor injury or moderate injury.

    CAUTION Indicates a potentially hazardous situation which if not avoided, may result in property damage.

    DANGER

    WARNING

  • 2

    6 F 2 T 0 1 7 4

    Current transformer circuit Never allow the current transformer (CT) secondary circuit connected to this equipment to be opened while the primary system is live. Opening the CT circuit will produce a dangerously high voltage.

    Exposed terminals Do not touch the terminals of this equipment while the power is on, as the high voltage generated is dangerous.

    Residual voltage Hazardous voltage can be present in the circuit just after switching off the power supply. It takes approximately 30 seconds for the voltage to discharge.

    CAUTION

    Earth The earthing terminal of the equipment must be securely earthed.

    CAUTION

    Operating environment The equipment must only used within the range of ambient temperature, humidity and dust detailed in the specification and in an environment free of abnormal vibration.

    Ratings Before applying AC voltage and current or the power supply to the equipment, check that they conform to the equipment ratings.

    Printed circuit board Do not attach and remove printed circuit boards when the DC power to the equipment is on, as this may cause the equipment to malfunction.

    External circuit When connecting the output contacts of the equipment to an external circuit, carefully check the supply voltage used in order to prevent the connected circuit from overheating.

    Connection cable Carefully handle the connection cable without applying excessive force.

    Power supply If power has not been supplied to the relay for two days or more, then all fault records, event records and disturbance records and internal clock may be cleared soon after restoring the power. This is because the back-up RAM may have discharged and may contain uncertain data.

    Modification Do not modify this equipment, as this may cause the equipment to malfunction.

    Disposal When disposing of this equipment, do so in a safe manner according to local regulations.

    DANGER

    WARNING

  • 3

    6 F 2 T 0 1 7 4

    Contents Safety Precautions 1

    1. Introduction 7

    2. Application Notes 9 2.0 Motor status monitoring 9 2.1 Overcurrent Protection according to motor status 10

    2.1.1 Instantaneous and definite time Overcurrent Protection during motor start-up 10

    Scheme Logic 11 Settings 12 2.1.2 Inverse Time and Definite time Overcurrent Protection during

    motor running 12 2.1.3 Inverse Time Overcurrent Protection 13 2.1.4 Definite Time Overcurrent Protection 15 Scheme Logic 16 Settings 18

    2.2 Residual Earth Fault Overcurrent Protection 19 2.2.1 Inverse Time Earth Fault Protection 19 2.2.2 Instantaneous and definite time Earth Fault Protection 19 Scheme Logic 19 Settings 21 2.2.3 CT Wiring and Setting of earth fault detection 23

    2.3 Sensitive Earth Fault Protection 23 2.4 Phase Undercurrent Protection 28 2.5 Thermal Overload Protection 30 2.6 Negative Phase Sequence Overcurrent Protection 33 2.7 Broken Conductor Protection 35 2.8 Breaker Failure Protection 38 2.9 Countermeasures for Magnetising Inrush 41

    2.9.1 Inrush Current Detector 41 2.9.2 Cold Load Protection 42

    2.10 Motor Protection functions 44 2.10.1 Start Protection 44 2.10.2 Stalled motor Protection 45 2.10.3 Locked Rotor Protection 46 2.10.4 Restart Inhibit 49 2.10.5 Emergency Start 51

    2.11 Trip Signal Output 52 2.12.1 Phase Fault and Earth Fault Protection 54 2.12.2 Minimum Knee Point Voltage 54

  • 4

    6 F 2 T 0 1 7 4

    2.12.3 Sensitive Earth Fault Protection 55 2.12.4 Restricted Earth Fault Protection 55

    3. Technical Description 56 3.1 Hardware Description 56

    3.1.1 Outline of Front Panel 56 3.2 Input and Output Signals 58

    3.2.1 AC Input Signals 58 3.2.2 Binary Input Signals 58 3.2.3 Binary Output Signals 61

    3.3 Automatic Supervision 62 3.3.1 Basic Concept of Supervision 62 3.3.2 Relay Monitoring 63 3.3.3 Trip Circuit Supervision 64 3.3.4 Circuit Breaker Monitoring 65 3.3.5 Rotor Locked Monitoring 66 3.3.6 Restart Inhibit Monitoring 67 3.3.7 Failure Alarms 67 3.3.8 Trip Blocking 68 3.3.9 Setting 68

    3.4 Recording Function 69 3.4.1 Fault Recording 69 3.4.2 Event Recording 70 3.4.3 Disturbance Recording 70

    3.5 Metering Function 72

    4. User Interface 73 4.1 Outline of User Interface 73

    4.1.1 Front Panel 73 4.1.2 Communication Ports 75

    4.2 Operation of the User Interface 76 4.2.1 LCD and LED Displays 76 4.2.2 Relay Menu 79 4.2.3 Displaying Records 83 4.2.4 Displaying the Status 90 4.2.5 Viewing the Settings 97 4.2.6 Changing the Settings 99 4.2.7 Control 138 4.2.8 Testing 140

    4.3 Personal Computer Interface 143 4.4 MODBUS Interface 143 4.5 Clock Function 143 4.6 Special Mode 144

    5. Installation 146

  • 5

    6 F 2 T 0 1 7 4

    5.1 Receipt of Relays 146 5.2 Relay Mounting 146

    5.2.1 Flush Mounting 146 5.3 Electrostatic Discharge 148 5.4 Handling Precautions 148 5.5 External Connections 148

    6. Commissioning and Maintenance 149 6.1 Outline of Commissioning Tests 149 6.2 Cautions 149

    6.2.1 Safety Precautions 149 6.2.2 Cautions on Tests 150

    6.3 Preparations 151 6.4 Hardware Tests 152

    6.4.1 User Interfaces 152 6.4.2 Binary Input Circuit 152 6.4.3 Binary Output Circuit 153 6.4.4 AC Input Circuits 154

    6.5 Function Test 155 6.5.1 Measuring Element 155 6.5.2 Protection Scheme 165 6.5.3 Metering and Recording 165

    6.6 Conjunctive Tests 167 6.6.1 On Load Test 167 6.6.2 Tripping Circuit Test 167

    6.7 Maintenance 167 6.7.1 Regular Testing 167 6.7.2 Failure Tracing and Repair 167 6.7.3 Replacing Failed Relay 167 6.7.4 Resumption of Service 167 6.7.5 Storage 167

    7. Putting Relay into Service 167

  • 6

    6 F 2 T 0 1 7 4

    Appendix A 174 Programmable Reset Characteristics and Implementation of Thermal Model

    to IEC60255-8

    Appendix B 178 Signal List

    Appendix C 186 Event Record Items

    Appendix D 191 Binary Output Default Setting List

    Appendix E 193 Relay Menu Tree

    Appendix F 204 Case Outline

    Appendix G 206 Typical External Connections

    Appendix H 211 Relay Setting Sheet

    Appendix I 226 Commissioning Test Sheet (sample)

    Appendix J 230 Return Repair Form

    Appendix K 236 Technical Data

    Appendix L 243 Symbols Used in Scheme Logic

    Appendix M 247 Modbus: Interoperability

    Appendix N 274 Inverse Time Characteristics

    Appendix O 280 Ordering

    The data given in this manual are subject to change without notice. (Ver.1.0)

  • 7

    6 F 2 T 0 1 7 4

    1. Introduction GRE120 series relays provide motor protection for Medium Voltage class networks.

    Note: GRE120 series relays are non-directional, and are applicable to systems where fault current flows in a fixed direction, or flows in both directions but there is a significant difference in magnitude. In systems where a fault current flows in both directions and there is not a significant difference in the magnitude of the fault current, then a directional relay should be applied.

    The GRE120 series has four models and provides the following protection schemes in all models.

    Overcurrent protection for phase and earth faults with definite time or inverse time characteristics

    Instantaneous overcurrent protection for phase and earth faults

    Thermal overload protection

    Locked rotor protection and restart inhibit

    The GRE120 series provides sensitive earth fault protection dependent upon which model has been chosen.

    The GRE120 series provides the following functions for all models.

    Two settings groups

    Configurable binary inputs and outputs

    Circuit breaker control and condition monitoring

    Trip circuit supervision

    Automatic self-supervision

    Menu-based HMI system

    Configurable LED indication

    Metering and recording functions

    Front mounted USB port for local PC communications

    Rear mounted RS485 serial ports for remote PC communications and Optional Connection

    Table 1.1.1 shows the members of the GRE120 series and identifies the functions to be provided by each member.

  • 8

    6 F 2 T 0 1 7 4

    Table 1.1.1 Series Members and Functions Model Number GRE120 -

    400 401 420 421

    Current input 3P + E 3P + E 3P + E(*) + SE 3P + E + SE

    Binary Input port 2 6 2 6

    IDMT O/C (ROC1, ROC2)

    DT O/C (ROC1 2, SOC, ALOC)

    Instantaneous O/C (ROC1 2, SOC, ALOC)

    IDMT O/C (EF1, EF2)

    DT