AIN SHAMS UNIVERSITY

FACULTY OF ENGINEERING
Electrical Power & Machines Department
EPM 461 – Protection Engineering

Experiment (5)

Name : Abdelrhman Ahmed Salem Awad

ID : 1901025
 SEPAM 40

Features
Sepam series 40 includes 13 types of Sepam. One type of Sepam is dedicated to one
application.

Characteristics:

• 3 types of User-Machine Interface

• 4 current inputs

• 3 voltage inputs

• 10 logic inputs 8

• 8 relay outputs

• logic equation editor

• 1 Modbus communication port

• 16 temperature sensor inputs

S5X applications are identical to S4X applications, with the following additional
functions:
• Earth fault and phase overcurrent cold load pick-up

• Broken wire detection

• Fault locator

T5X applications are identical to T4X applications, with the following additional
functions:
• Earth fault and phase overcurrent cold load pick-up

• Broken wire detection

Standard Manufacturers Warranty: 2 years

Benefits
Simplicity and performance, headed in the right direction
Protect your power system with full peace of mind using Sepam protection relays.
• 20 years of experience in digital relays

• A consistent range of relays organised according to applications

Applications
• S40, S41, S42, S50, S51, S52, S53, S54: substation incomer and feeder
protection

• T40, T42, T50, T52: transformer protection

• M41: motor protection

• G40: generator protection

Photos

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Main functions:
Protection bphase protection and earth fault protection with
adjustable reset time, with switching of the active group of
settings and logic discrimination bearth fault protection
insensitive to transformer switching bRMS thermal overload
protection that takes into account external operating temperature
and ventilation operating rates bdirectional earth fault protection
suitable for all isolated, compensated or impedant neutral
systems bidirectional phase overcurrent protection with voltage
memory bvoltage and frequency protection functions
(under/over, etc.). Communication Sepam can be connected to a
supervision communication network (S-LAN) based on the
following communication protocols: Modbus RTU, DNP3, IEC
60870-5-103, IEC61850. All the data needed for centralized
equipment management from a remote control and monitoring
system are available via the communication port: b in read
mode: all measurements, alarms, settings, etc. b in write mode:
breaking device remote control orders, etc. Diagnosis 3 types of
diagnosis data for improved operation: bnetwork and machine
diagnosis: tripping current, context of the last 5 trips, unbalance
ratio, disturbance recording bswitchgear diagnosis: cumulative
breaking current, trip circuit supervision, operating time
bdiagnosis of the protection unit and additional modules:
continuous self-testing, watchdog. Control and monitoring
bcircuit breaker program logic ready to use, requiring no
auxiliary relays or additional wiring badaptation of control
functions by a logic equation editor bpreprogrammed,
customizable alarm messages on UMI.
Phase current Residual current :

Phase current Operation This function gives the RMS value of

the phase currents: b I1: phase 1 current b I2: phase 2 current b
I3: phase 3 current. It is based on RMS current measurement
and takes into account harmonics up to number 17. Readout The
measurements may be accessed via: b the advanced UMI
display unit by pressing the key b the display of a PC with the
SFT2841 software b the communication link ban analog
converter with the MSA141 option.

Residual current Operation This operation gives the RMS value

of the residual current I0. It is based on measurement of the
fundamental component. Readout The residual current measured
(I0), and the residual current calculated by the sum of the phase
currents (IoΣ) may be accessed via: b the advanced UMI display
unit by pressing the key b the display of a PC with the SFT2841
software b the communication link ban analog converter with
the MSA141 option.

Average current and peak demand currents:

Operation This function gives: b the average RMS current for
each phase that has been obtained for each integration interval b
the greatest average RMS current value for each phase that has
been obtained since the last reset. The values are refreshed after
each "integration interval", an interval that may be set from 5 to
60 mn, and are saved in the event of a power failure. Readout
The measurements may be accessed via: b the advanced UMI
display unit by pressing the key b the display of a PC with the
SFT2841 software b the communication link. Resetting to zero
bpress the key on the advanced UMI display unit when a peak
demand current is displayed bvia the clear command in the
SFT2841 software bvia the communication link (remote control
order TC6).
Phase-to-phase voltage Phase-to-neutral voltage:
Phase-to-phase voltage Operation This function gives the RMS
value of the 50 or 60 Hz component of phase-to-phase voltages
(according to voltage sensor connections): bU21: voltage
between phases 2 and 1 bU32: voltage between phases 3 and 2
bU13: voltage between phases 1 and 3. It is based on
measurement of the fundamental component. Readout The
measurements may be accessed via: b the advanced UMI
display unit by pressing the key b the display of a PC with the
SFT2841 software b the communication link ban analog
converter with the MSA141 option.

Residual voltage Positive sequence voltage:

Residual voltage Operation This function gives the value of the
residual voltage V0 = (V1 + V2 + V3). V0 is measured: bby
taking the internal sum of the 3 phase voltages bby an open star
/ delta VT. It is based on measurement of the fundamental
component. Readout The measurement may be accessed via: b
the advanced UMI display unit by pressing the key b the
display of a PC with the SFT2841 software b the
communication link.
Negative sequence voltage Operation This function gives the
calculated value of the negative sequence voltage Vi. Readout
The measurement may be accessed via: b the advanced UMI
display unit by pressing the key b the display of a PC with the
SFT2841 software b the communication link.
Frequency:
Operation This function gives the frequency value. Frequency is
measured via the following: bbased on U21, if only one phase-
to-phase voltage is connected to the Sepam bbased on positive
sequence voltage, if the Sepam includes U21 and U32
measurements. Frequency is not measured if: b the voltage U21
or positive sequence voltage Vd is less than 40 % of Un b the
frequency is outside the measurement range. Readout The
measurement may be accessed via: b the advanced UMI display
unit by pressing the key b the display of a PC with the SFT2841
software b the communication link ban analog converter with
the MSA141 option.

Active, reactive and apparent power:

Operation This function gives the power values: bP active
power = 3.U.I cos ϕ bQ reactive power = 3.U.I.sin ϕ bS apparent
power = 3.U.I. The function measures the active and reactive
power in 3-wire 3-phase arrangements by means of the two
wattmeter method. The powers are obtained based on the phase-
to-phase voltages U21 and U32 and the phase currents I1andI3.
When only the voltage U21 is connected, P and Q are calculated
assuming that the system voltage is balanced. According to
standard practice, it is considered that: b for the outgoing circuit
(1): vpower exported by the busbar is positive vpower supplied
to the busbar is negative MT10168 b for the incoming circuit
(1): vpower supplied to the busbar is positive vpower exported
by the busbar is negative. MT10179 Readout The measurements
may be accessed via: b the advanced UMI display unit by
pressing the key b the display of a PC with the SFT2841
software b the communication link ban analog converter with
the MSA141 option. (1) Choice to be set in the general settings.
Peak demand active and reactive power Power
factor (cos ϕ):
Peak demand active and reactive power Operation This function
gives the greatest average active or reactive power value since
the last reset. The values are refreshed after each "integration
interval", an interval that may be set from 5 to 60 mn (common
interval with peak demand phase currents). The values are saved
in the event of a power failure. Readout The measurements may
be accessed via: b the advanced UMI display unit by pressing
the key b the display of a PC with the SFT2841 software b the
communication link. Resetting to zero bpress the key on the
advanced UMI display unit when a peak demand is displayed
bvia the "clear" command in the SFT2841 software bvia the
communication link (remote control order TC6).