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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.
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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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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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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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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
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TRANSMISSION LINE PROTECTION
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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
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RCS-921Breaker Failure Protection
RCS-923 Breaker Failure Protection
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BUSBAR PROTECTION
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RCS-915Busbar Protection
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TRANSFORMER PROTECTION
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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
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RCS-917Reactor Protection
RCS-9647C Reactor Management Relay
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GENERATOR AND GENERATOR-
TRANSFORMER UNIT PROTECTION
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RCS-985
Generator-Transformer Unit Protection
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MOTOR PROTECTION
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RCS-9641C Motor Management Relay
RCS-9642C Motor Management Relay
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ACCESSORIES
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CZX-12R Interposing Relay Set
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SUBSTATION AUTOMATION SYSTEM
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RCS-9700C Bay Control Unit (BCU)
RCS-9786 Protocol Converter
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