SE Digest 178

Sepam™ Motor Applications

Sepam™ Protection Relays

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Sepam Motor Applications

Motor protection is broken into three sections Basic, Standard, and Advanced. The Basic protection is covered with our Sepam M20 protection relay and handles overcurrent (50/ 51) and ground faults (50G/51G or 50N/51N). The Standard protection is covered with the Sepam M41 protection relay and covers a host of current, voltage, and frequency protection elements. The Advanced protection is covered with the Sepam M87/M88 and covers current, voltage, frequency, and differential protection functions. Basic Protection Relay (M20 - Sepam 20 Series) Typical Part Number: SQ1M20A1B1A0A0 Series 20 - Motor Protection M20 (24-250Vdc & 120-240Vac), 1/5A CT inputs, 10In/8Out (110-125 Vdc, 110Vac), RS485 Standard Protection Relay (M41 – Sepam 40 Series) Typical Part Number: SQ1M41A1B1A0A0 Series 40 - Motor Protection M41 (24-250Vdc & 120-240Vac), 1/5A CT inputs, 10In/8Out (110-125 Vdc, 110Vac), RS485 Advanced Protection Relay (M87/M88 – Sepam 80 Series) Typical Part Number: SQ1M87P1J5A0B0 Series 80 - Motor Protection S84 (24-250Vdc), mimicBus Graphical Display, 1/5A CT inputs, 14In/11Out Digital Module (110-125Vdc/ mid p.u.), 2 x RJ-45 ports (Modbus or IEC61850 with GOOSE), ladder logic firmware (PLC base).

M20/M41

M87/M88

Table 5.15: Features Feature

M20

M41

M87/M88

Current Protection Built in CB Control

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Native Zone Selective Interlocking

Waveform Captures Event Records Voltage Protection Frequency Protection

Field Expandable Communications Synchro-check Protection (optional) Native Automatic Throw over Scheme

Field expandable I/O

Ladder Logic PLC custom programming (optional)

Mimic-bus graphical display (optional)

Onboard data logging

Native Load Shedding and Motor Restart

Ability to incorporate a transformer into the same zone of protection (M88 only)

Built in Motor start and trending reports

ModbusRTU

● ●

● ● ● ●

DPN

Communications options

Modbus TCP/IP IEC61850–MMS

IEC61850–MMS + GOOSE

Table 5.16: Functions ANSI Device Number

Description Speed Switch

M20

M41

M87

M88

12/14

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

26 27

Thermostat

Phase-to-phase undervoltage Positive sequence undervoltage

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27D 27R 27S 32P

Remnant Undervoltage

Phase-to-neutral undervoltage

Directional Power

32Q/40/55

Directional Reactive Power

5 PROTECTION, CONTROL, AND ENERGYAUTOMATION

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

●

Excessive Starting Time

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Thermal Overload RTD Monitoring Breaker Failure

49T

50BF

50

Instantaneous Phase Overcurrent

50G 50N 51G 51N 51

Instantaneous Ground Overcurrent(Measured) Instantaneous Ground Overcurrent(Calculated)

Time Phase Overcurrent

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

51LR

Locked Rotor

59

Phase-to-phase overvoltage Neutral Voltage Displacement

59N

66

Starts per hour

●

67N

Directional Ground Overcurrent

78

PoleSlip

81H 81L 87M 87T

Overfrequency Underfrequency

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Machine Differential

2 Winding Transformer Differential

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5-11

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11/20/2019