Sepam™ Transformer Applications

Sepam Transformer Applications

T24/T42

T87

Transformer protection is broken into three sections Basic, Standard, and Advanced. The Basic protection is covered with our Sepam T24 protection relay and handles overcurrent (50/51) and ground faults (50G/51G or 50N/51N). The Standard protection is covered with the Sepam T42 protection relay and covers a host of current, voltage, and frequency protection elements. The Advanced protection is covered with the Sepam T87 and covers current, voltage, frequency, differential, and synchro check protection functions.

Basic Protection Relay (T24 - Sepam 20 Series)

Typical Part Number: SQ1T24A1B1A0A0 Series 20 - Transformer Protection T24 (24-250Vdc & 120-240Vac), 1/5A CT inputs, 10In/8Out (110-125 Vdc, 110Vac), RS485

Standard Protection Relay (T42 – Sepam 40 Series)

Typical Part Number: SQ1T42A1B1A0A0 Series 40 - Transformer Protection T42 (24-250Vdc & 120-240Vac), 1/5A CT inputs, 10In/8Out (110-125 Vdc, 110Vac), RS485

Advanced Protection Relay (T87 – Sepam 80 Series)

Typical Part Number: SQ1T87P1J5A0B0 Series 80 - Transformer 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).

Features

Feature

T24

T42

T87

Current Protection

Built in CB Control

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

   

Communications options

Modbus RTU

DPN

Modbus TCP/IP

 

IEC61850–MMS

 

IEC61850–MMS + GOOSE

   

Functions

ANSI Device Number

Description

T24

T42

T87

24

Volts/Hertz

   

25

Synch Check

   

26

Thermostat

27

Phase-to-phase undervoltage

 

27D

Positive sequence undervoltage

   

27R

Remnant Undervoltage

   

27S

Phase-to-neutral undervoltage

 

32P

Directional Power

   

38

Bearing Temperature

46

Negative Sequence Current/Unbalance

47

Negative Sequence undervoltage

 

49

Thermal Overload

49T

RTD Monitoring

50BF

Breaker Failure

50

Instantaneous Phase Overcurrent

50G

Instantaneous Ground Overcurrent (Measured)

50N

Instantaneous Ground Overcurrent (Calculated)

50V

Voltage Restrained Instantaneous  overcurrent

   

51

Time Phase Overcurrent

51G

Time Ground Overcurrent (Measured)

51N

Time Ground Overcurrent (Calculated)

59

Phase-to-phase overvoltage

 

59N

Neutral Voltage Displacement

 

63

Buchholz Pressure

64REF

Restricted Ground Fault

   

67N

Directional Ground Overcurrent

 

 

67

Directional Phase Overcurrent

 

81H

Overfrequency

 

81L

Underfrequency

 

87T

2 Winding Transformer Differential

   

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