SE Digest 178

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 5.2: Sepam 20, 40 and 80 Protection Functions ANSI Device Number Description

Sepam 20/40 Relay Models Sepam 80 Relay Models S24 M20 B22 S40 T40 T42 M41 G40 S84 M87 M88 T87 G87 G88 C86 B80 B83

Speed Switch

12/14

●

●

● ●

● ● ● ●

Underimpedance

21B

24 25 26 27

Volts/Hertz Synch Check Thermostat

● ● ● ● ● ●

●

● ●

● ●

● ● ●

●

Phase-to-phase Undervoltage Positive sequence Undervoltage

●●●●●●●●●●●●●●●

27D 27R 27S

● ●

● ●

● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●

Remnant Undervoltage

Phase-to-neutral Undervoltage

●●●●●●●●●●●●●●●

Third Harmonic Neutral Undervoltage

27TN

● ●

32P

Directional Power

● ● ● ● ● ● ● ●

32Q/40/55 Directional Reactive Power

● ●

● ●

● ●

37 38 40 46 47 48 49

Phase Undercurrent Bearing Temperature Loss of Excitation

● ●

●

● ● ●

● ● ● ●

● ● ● ● ● ●

● ●

● ●

● ●

Negative Sequence Current/Unbalance Negative Sequence Undervoltage

● ●

●●●●●●●●●●●●●● ●●●●●●●●●●●●●●●

Excessive Starting Time

● ● ●

●

● ●

Thermal Overload RTD Monitoring Breaker Failure

●●●●●●●●●●●

49T

● ● ● ●

● ● ● ● ● ●

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

●

●●●●●●●●●●●●●●

Inadvertent Energization

● ●

Instantaneous Phase Overcurrent

● ●

●●●●●●●●●●●●●● ●●●●●●●●●●●●●● ●●●●●●●●●●●●●●

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

●

● ●

● ● ●

Time Phase Overcurrent Capacitor Bank Unbalance

● ●

●●●●●●●●●●●●●●

●

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

●

●●●●●●●●●●●●●● ●●●●●●●●●●●●●●

● ●

Locked Rotor

●

●

● ●

Voltage Restrained Instantaneous Overcurrent

● ●

Voltage Restrained Time Overcurrent

● ●

Phase-to-phase Overvoltage Neutral Voltage Displacement

59

●●●●●●●●●●●●●●● ●●●●●●●●●●●●●●●

59N 5 PROTECTION, CONTROL, AND ENERGYAUTOMATION 63 Buchholz Pressure 64G 64REF 66 67 Starts per hour 67N

● ●

●

100% Stator Ground Fault Restricted Ground Fault

● ●

●

●

●

● ●

Directional Phase Overcurrent Directional Ground Overcurrent

● ●

●

● ● ●

● ● ●

● ● ● ●

PoleSlip Reclosing

78 79

● ●

●

●

●

Overfrequency Underfrequency

81H 81L 81R

●●●●●●●●●●●●●●● ●●●●●●●●●●●●●●●

Rate of Change of Frequency

●

●

87M Machine Differential

●

●

2 Winding Transformer Differential

87T

● ●

●

5-6

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11/20/2019