Protective Relaying & Electrical System Protection

8/21/2019 Protective Relaying & Electrical System Protection

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PROTECTIVE RELAYING &Sagardighi Thermal Power Project

Presented by : Group 03, Department of Operation


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Why A System Needs Protection?

There is no fault free system. It is neither practical nor economical to build a fault free

system.

Electrical system shall tolerate certain degree of faults.

Usually faults are caused by breakdown of insulation dueto various reasons: system aging, lightning, etc.


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DEFINITION OF RELAY

It is an automatic device which senses an abnormal condition of electrical

circuit and closes its contacts.

These contacts in turns close and complete the

circuit breaker trip coil circuit hence trip the circuit breaker for disconnecting the

faulty portion of the electrical circuit from rest of the

healthy circuit.

Prepared by S.Aich3


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AutomaticDevice

AbnormalCondition

Operating

Mechanis

m


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RelayType

Settings

Operating

Mechanis

m


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IEEE Standard C37.2-2008

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1 Master Element

2 Time Delay Starting or Closing Relay

3 Checking or Interlocking Relay

4 Master Contactor

5 Stopping Device

6 Starting Circuit Breaker

7 Rate of Change Relay

8 Control Power Disconnecting Device

9 Reversing Device

10 Unit Sequence Switch

11 Multifunction Device

12 Overspeed Device13 Synchronous-speed Device

14 Underspeed Device

15 Speed or Frequency-Matching Device

16 Data Communications Device


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Prepared by S.Aich7

20 Elect. operated valve (solenoid valve)

21 Distance Relay

23 Temperature Control Device

24 Volts per Hertz Relay

25 Synchronizing or Synchronism-Check Device

26 Apparatus Thermal Device

27 Undervoltage Relay

30 Annunciator Relay

32 Directional Power Relay

36 Polarity or Polarizing Voltage Devices

37 Undercurrent or Underpower Relay

38 Bearing Protective Device39 Mechanical Conduction Monitor

40 Field (over/under excitation) Relay

41 Field Circuit Breaker

42 Running Circuit Breaker

43 Manual Transfer or Selector Device


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Prepared by S.Aich8

46 Rev. phase or Phase-Bal. Current Relay

47 Phase-Seq. or Phase-Bal. Voltage Relay

48 Incomplete-Sequence Relay

49 Machine or Transformer Thermal Relay

50 Instantaneous Overcurrent

51 AC Time Overcurrent Relay

52 AC Circuit Breaker

53 Field Excitation Relay

55 Power Factor Relay

56 Field Application Relay

59 Overvoltage Relay

60 Voltage or Current Balance Relay62 Time-Delay Stopping or Opening Relay

63 Pressure Switch

64 Ground Detector Relay

65 Governor


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Prepared by S.Aich9

66 Notching or jogging device

67 AC Directional Overcurrent Relay68 Blocking or out of step Relay

69 Permissive Control Device

74 Alarm Relay

75 Position Changing Mechanism

76 DC Overcurrent Relay

78 Phase-Angle Measuring Relay79 AC-Reclosing Relay

81 Frequency Relay

83 Automatic Selective Control or Transfer Relay

84 Operating Mechanism

85 Pliot Communications, Carrier or Pilot- Wire Relay

86 Lockout Relay

87 Differential Protective Relay

89 Line Switch

90 Regulating Device

91 Voltage Directional Relay

92 Voltage and Power Directional Relay

94 Tripping or Trip-Free Relay


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NARI Relays

List of Relays manufactured by Nanjing Nari-Relays

Prepared by S.Aich10


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TRANSMISSION LINE PROTECTION


RCS-901Line Directional Relay

RCS-902 Line Distance Relay

RCS-931 Line Differential Relay

RCS-941 Line Distance Relay

RCS-943 Line Differential Relay

RCS-922 Stub Differential Relay

RCS-924 Stub Differential Relay

RCS-925 Voltage Relay


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RCS 931


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CIRCUIT BREAKER PROTECTION


RCS-921Breaker Failure Protection

RCS-923 Breaker Failure Protection


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BUSBAR PROTECTION


RCS-915Busbar Protection


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TRANSFORMER PROTECTION


RCS-978Transformer Protection

RCS-974 Transformer Auxiliary Relay

RCS-9621C Transformer Management Relay

RCS-9661C Transformer Auxiliary Relay

RCS-9671C Transformer Differential Relay

RCS-9679C Transformer Relay

RCS-9681C Transformer Management Relay


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REACTOR PROTECTION


RCS-917Reactor Protection

RCS-9647C Reactor Management Relay


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GENERATOR AND GENERATOR-

TRANSFORMER UNIT PROTECTION


RCS-985

Generator-Transformer Unit Protection


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MOTOR PROTECTION


RCS-9641C Motor Management Relay

RCS-9642C Motor Management Relay


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ACCESSORIES


CZX-12R Interposing Relay Set


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SUBSTATION AUTOMATION SYSTEM


RCS-9700C Bay Control Unit (BCU)

RCS-9786 Protocol Converter


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Prepared by S Aich36

Documents

Protective Relaying & Electrical System Protection