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 Square D > On-line Catalog > Products > Power Monitoring and Control > PowerLogic® Sepam Digital Protective Relays
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PowerLogic® Sepam Digital Protective Relays

Class 3030

Sepam Series 20 and 40 Digital Protective Relay

The Sepam family of digital protection units, Series 20 and 40, is the newest generation of Sepam relay, a time tested product with a 15-year worldwide history.

Modular relay design allows quick and easy future upgrades to communications, digital I/O, analog output or temperature acquistion. The 64 x 128 bit, graphic LCD display and keypad permit basic relay setting without a PC. Comprehensive self-testing provides assurance of readiness to protect. The Sepam also has exceptional withstand to environmental electromagnetic disturbances.

S20 type replaces the PowerLogic Digital Relay DR1000.
Contains all the necessary protection functions for the specific application (select one).
Multiple setting groups for phase and ground overcurrent (also directional overcurrent where included). Overcurrent protections have 17 time current characteristics and primary current setpoints.
Basic user machine interface (UMI) with alarm/status LEDs and reset push button. Setting/operation front port is available for unmanned stations.
Advanced graphical LCD display unit (UMI) allows more flexible intuitive user interface than traditional alphanumeric displays. Visible from 6 feet away, the UMI provides measurements, diagnostics, and operational interfaces. Optional remote mounted display.
Up to 10 inputs and 8 outputs optional. One analog output and eight resistance temperature detector (RTD) inputs available as an external option for transformer and motor applications. 16 RTD inputs possible with
Series 40.
Logic inputs and outputs for: circuit breaker open and close control, inhibit closing, remote tripping, zone selective interlocking. Circuit breaker or contactor control logic is selectable via software or keypad; Boolean equation editor can customize protection, I/O alarm logic, and messages. Onboard alarms may be set to momentary or latch; an associated output contact may be set to pulse (94) or latch (86) and to be shunt (N.O.) or undervoltage (N.C.) actuating.
As an option, monitoring the circuit breaker for maintenance, operating time, charging time, trip circuit supervision (covering power supply, wiring and trip coil) cumulative total of tripping currents for 5 current ranges, operation counter. CT/VT supervision.
Time tagging of 200 events (64 on Series 20) and waveform capture of 800 cycles total (172 cycles for
Series 20) is provided. Time can be synchronized to ±1 msec via GPS time standard (See STS 3000).
Compatible with PowerLogic System Manager™ Software (SMS) for central management of electrical power system via 4-wire RS485, at up to 38,400 baud rate, using Modbus® protocol to communicate metering, reading protecton settings, alarms, control, and fault recorded data.
Meets applicable IEEE/IEC design standards (operating temperature range -25° C to +70° C).
Wide control power range: 24–250 Vdc/120–240 Vac.
Series 20 and 40 recognized by UL (c-UR-us) in Canada and US. Also approved by CSA.
ISO9001 certified.

Relay Feature
Function/Protection
ANSI Code
Content By Application
Feeder/Main
(Substation)
Transformer
Motor
Generator
Bus (Volts)
S20
S40
S41
S42
T20
T40
T42
M20
M41
G40
B21
B22
Phase overcurrent
50/51
4  
4  
4  
4  
4  
4  
4  
4  
4  
4  
 
 
Voltage-restrained phase overcurrent
50V/51V
 
 
 
 
 
 
 
 
 
1  
 
 
Ground fault, sensitive ground fault
50N/51N/50G/51G
4  
4  
4  
4  
4  
4  
4  
4  
4  
4  
 
 
Circuit breaker failure
50BF
 
1  
1  
1  
 
1  
1  
 
1  
1  
 
 
Negative sequence/unbalance
46
1  
2  
2  
2  
1  
2  
2  
1  
2  
2  
 
 
Directional phase overcurrent
67
 
 
 
2  
 
 
2  
 
 
 
 
 
Directional ground fault
67N/67NC
 
 
2  
2  
 
 
2  
 
2  
 
 
 
Directional active overpower
32P
 
 
1  
1  
 
 
 
 
1  
1  
 
 
Directional reactive overpower
32Q/40
 
 
 
 
 
 
 
 
1  
1  
 
 
Thermal overload
49RMS
 
 
 
 
2  
2  
2  
2  
2  
2  
 
 
Phase undercurrent
37
 
 
 
 
 
 
 
1  
1  
 
 
 
Excessive starting time, locked rotor
48/51LR/14
 
 
 
 
 
 
 
1  
1  
 
 
 
Starts per hour
66
 
 
 
 
 
 
 
1  
1  
 
 
 
Positive sequence undervoltage
27D/47
 
 
 
 
 
 
 
 
 
 
2  
2  
Positive sequence undervoltage
27D
 
 
 
 
 
 
 
 
2  
 
 
 
Remanent undervoltage
27R
 
 
 
 
 
 
 
 
1  
 
1  
1  
Phase-to-phase undervoltage
27
 
 
 
 
 
 
 
 
 
 
2  
2  
Phase-to-neutral undervoltage
27S
 
 
 
 
 
 
 
 
 
 
1  
1  
Undervoltagea
27/27S
 
2  
2  
2  
 
2  
2  
 
2  
2  
 
 
Overvoltagea
59
 
2  
2  
2  
 
2  
2  
 
2  
2  
2  
2  
Neutral voltage displacement
59N
 
2  
2  
2  
 
2  
2  
 
2  
2  
2  
2  
Negative sequence overvoltage
47
 
1  
1  
1  
 
1  
1  
 
1  
1  
 
 
Overfrequency
81H
 
2  
2  
2  
 
2  
2  
 
2  
2  
1  
1  
Underfrequency
81L
 
4  
4  
4  
 
4  
4  
 
4  
4  
2  
2  
Rate of change of frequency
81R
 
 
 
 
 
 
 
 
 
 
 
1  
Recloser (4 shots)
79
c  
c  
c  
c  
 
 
 
 
 
 
 
 
Temperature monitoring (8/16RTDs, 2 set points per RTD)b
38/49T
 
 
 
 
c8  
c  
c  
c8  
c  
c  
 
 
Thermostat/Buchholz
38/63
 
 
 
 
c  
c  
c  
 
 
 
 
 

a Make an exclusive choice, phase-to-phase volts or phase-to-neutral volts for these functions.
b Two RTD modules possible with Series 40 units.
c Active if `ON' and using optional digital or analog:(RTD) I/O modules.
9/8/03 © 2005 Schneider Electric
All Rights Reserved
 
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