Square D Digest 179

Sepam™ Protection Relays

Sepam™ Protection Configurations

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Sepam Protection Configurations Three relay series with increasing protection capabilities for six types of applications to provide all possible protection configurations

Table 5.13: Sepam 80 Protection Functions ANSI Device Number Description

Sepam 80 Relay Models S84 M87 M88 T87 G87 G88 C86 B80 B83

Speed Switch

12/14

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Underimpedance

21B

24 25 26 27

Volts/Hertz Synch Check Thermostat

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Phase-to-phase Undervoltage Positive sequence Undervoltage

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27D 27R 27S

Remnant Undervoltage

Phase-to-neutral Undervoltage

Third Harmonic Neutral Undervoltage

27TN

32P

Directional Power

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32Q/40/55

Directional Reactive Power

37 38 40 46 47 48 49

Phase Undercurrent Bearing Temperature Loss of Excitation

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Negative Sequence Current/Unbalance Negative Sequence Undervoltage

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Excessive Starting Time

Thermal Overload RTD Monitoring Breaker Failure

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49T

50BF 50/27 50G 50N 50V 51C 51G 51N 50V 51V 51 51LR 50

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Inadvertent Energization

Instantaneous Phase Overcurrent

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Instantaneous Ground Overcurrent (Measured) Instantaneous Ground Overcurrent (Calculated) Voltage Restrained Instantaneous Overcurrent

Time Phase Overcurrent Capacitor Bank Unbalance

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Time Ground Overcurrent (Measured) Time Ground Overcurrent (Calculated)

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Locked Rotor

Voltage Restrained Instantaneous Overcurrent

Voltage Restrained Time Overcurrent

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Phase-to-phase Overvoltage Neutral Voltage Displacement

59

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59N 5 PROTECTION, CONTROL, AND ENERGYAUTOMATION 63 64G 64REF 66 67 67N

Buchholz Pressure

100% Stator Ground Fault Restricted Ground Fault

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Starts per hour

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Directional Phase Overcurrent Directional Ground Overcurrent

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PoleSlip Reclosing

78 79

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Overfrequency Underfrequency

81H 81L 81R 87M 87T

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Rate of Change of Frequency

Machine Differential

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2 Winding Transformer Differential

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Sepam™ 80 Characteristics

Table 5.14: Protection Configurations Characteristics

Series80

Logic inputs Logic outputs

0-42 5-23 0-16

Temperature sensors

Current 2 x 3I + 2 x I0 Voltage 2 x 3V + V0 LPCT [1]

Channels

2-4 ModBus, IEC 103, DNP3, IEC 61850 Redundancy Goose Messaging

Communication Ports

Matrix [2] Logic equation editor Logipam [3]

Control

Front memory cartridge with settings Backup lithium battery [4]

Other

[1] LPCT: low-power current transducer complying with standard IEC 60044-8. [2] Control matrix for simple assignment of information from the protection, control and monitoring functions. [3] Logipam ladder language (PC programming environment) to make full use of Sepam series 80 functions. [4] Standard lithium battery 1/2 AA format 3.6 V front face exchangeable.

5-12

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