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Sepam series 20 specification form
Protection and control unit
Since the Protection and Control unit is installed in the
switchgear, it must meet the severest environmental withstand
requirements, in particular:
IEC standards:
60255-5 impulse withstand: 5 kV
60255-22-1 1Mhz wave: Class III
60255-22-4 fast transients: Class IV
61000-4-3 electromagnetic radiation: class III
 60529 degree of protection: IP 52 on front panel
 60255-21-1,2,3 vibration, shocks, earthquakes: class II
The operating temperature shall be between -25°C and + 70° C.
One unit shall be designed to accommodate all types of control
power supply voltages: 24, 48, 127 & 220 Vdc and 110 & 230
Vac.
The design and manufacturing process shall be ISO 9001
certified.
The Protection and Control Unit shall have UL certification.
It should be possible to withdraw the unit without prior current
circuit short-circuiting
The control output relays shall be capable of withstanding
steady state current of 8 A.
Operating dependability
The Protection and Control unit shall include:
an internal function self-monitoring mechanism, which
activates one fail-safe watchdog changeover contacts
an automatic device for switching to the fail-safe position,
disabling output controls when a major internal failure is
detected
indication of self test status of the device by LED and text.
Installation
The Protection and Control unit should be compact and easy to
install
reduced depth (<100 mm)
remote optional modules shall be prewired
Sepam series 20 Specification form
Medium Voltage Protection Relay
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Protection
The Protection and Control Unit shall contain all the necessary
protections for the specific application:
 Substation/Feeder protections:
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50/51 Phase overcurrent
50N/51N Earth fault (or neutral)
46 Unbalance / negative sequence
79 Recloser (4 cycles)
 Transformer protection
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50/51 Phase overcurrent
50N/51N Earth fault (or neutral)
46 Unbalance / negative sequence
49 RMS thermal overload
Thermostat / Buchholz
Temperature monitoring
 Motor protection
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50/51 Phase overcurrent
50N/51N Earth fault (or neutral)
46 Unbalance / negative sequence
49 RMS Thermal overload
37 Phase undercurrent
48/51LR Excessive starting time, locked rotor
66 Starts per hour
Temperature monitoring
 Busbar protection
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27D/47 Positive sequence undervoltage
27R Remanent undervoltage
27 Phase-to-phase undervoltage
27S Phase-to-neutral undervoltage
59 Phase-to-phase overvoltage
59N Neutral voltage displacement
81H Overfrequency
81L Underfrequency
81R Rate of change of frequency
Each protection device shall have wide setting ranges, in
particular for current protections, providing a choice of curve
types between definite time curve (DT), with time delay settings
from instantaneous (50 ms) to 300 s, and IDMT curves (SIT,
VIT, LTI, EIT, UIT, RI, IEC SIT / A, IEC VIT or LTI / B, IEC EIT /
C, IEEE moderately inverse, IEEE very inverse, IEEE extremely
inverse, IAC inverse, IAC very inverse, IAC extremely inverse)
adjustable either by time delay or TMS factor.
Phase overcurrent and earth fault protection shall have an
adjustable timer hold to allow restriking faults detection.
Earth fault protection shall integrate a harmonic 2 restraint,
which can be inhibited or activated.
Alternative overcurrent setting groups will be selectable by
logical conditions to adapt fast protection plan change as well as
Sepam series 20 Specification form
Medium Voltage Protection Relay
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remote setting facilities for thresholds and time delay
adjustments.
The unit shall allow for the use of upstream and downstream
logic discrimination in order to discriminate correctly when used
in a cascade scheme.
Overload protection will be based on RMS current value
(up to a minimum 17th harmonic) and will take into account the
ambient temperature.
Alternative overload setting groups will be selectable by logical
conditions to adapt operating mode change.
Adjustment of the overload tripping curves will be possible to
exactly fit the motor characteristics.
Setting shall be performed by the direct input of actual current
values.
Protection tripping shall be indicated on the front of the device
by a LED and text indicating the cause of the fault.
Metering
Man Machine Interface (front
panel)
Each Protection and Control unit shall include the
measurements needed for operation and commissioning, i.e. at
least the following - for feeder, transformer and motor
applications:
RMS 3-phase current measurement
residual current measurement
average and maximum phase current demand
measurement of fault current broken in each phase
additional measurements such as unbalance ratio, thermal
capacity used, ...
The unit shall provide one of the measurement on an analog
output
The Protection and Control unit shall include a display unit that
indicates:
measurement values
operating messages (choice of language English or local)
device maintenance messages
The display unit shall have as a minimum 2 lines for clear
annunciation of alarm conditions.
8 Signals LEDs will be available for alarms and status, including:
breaker position (open/closed), relay self test, phase fault and
earth fault alarms. It shall be possible to customize the
assignment of the signal LEDs.
The display indication shall be in 2 languages
English
Local
Sepam series 20 Specification form
Medium Voltage Protection Relay
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The Protection and Control unit shall include a keypad to allow
to perform the following operations:
 display of metering and operating data, alarm messages
 clearing of alarms and resetting, acknowledgement
 access to protection settings
 access to the unit parameter settings
Access to setting mode will be protected by 2 different
customized passwords of at least 4 characters: 1 to protect
access to the protection settings, the other to protect access to
the unit parameter settings.
It shall be possible to remote the MMI to allow installation of the
Protection and Control unit in a different place than the MMI for
the most advantageous location for operation & monitoring.
Control and monitoring
The Protection and Control unit shall include the logic inputs
and outputs resources required for control of the breaking device
(circuit-breaker or contactor) and for interfacing with the
monitoring or logic process.
The unit shall have at least 4 relay outputs, with extension
capability up to 10 logic inputs and 8 relay outputs
Extension of the number of logic inputs and outputs will be
possible to :
 CB open and close control, whatever the type of shunt trip or
undervoltage release coil control
 ANSI 69 / Inhibit closing
 Remote tripping
 As an option, monitoring of the circuit breaker for
maintenance statistics purpose: operating time, charging
time, trip circuit supervision (covering power supply, wiring
and coil) cumulative total of tripping currents for 5 current
ranges, operation counter, pressure (for SF6 circuit
breakers)
 As an option, monitoring the temperature (motors,
transformers)
 storage of information (even during control power supply
outages).
1 analog output and 8 temperature sensor inputs will be
available as an extension to the Protection and Control unit.
(transformer and motor applications)
Disturbance recording:
Triggered on event (automatic or manual)
Each record will allow to store data for at least 80 periods,
12 values per period, with a number of periods before the event
according to the setup
 The content of the record will be, as a minimum, the date,
channel characteristics, 4 current channels (I1, I2, I3, I0) and
Sepam series 20 Specification form
Medium Voltage Protection Relay
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the digital inputs
The number of records will be as a minimum 2 events
The event format shall be COMTRADE 97
The unit will provide time-tagging of minimum 64 events within
an accuracy of 1ms.
Communication
The Protection and Control unit will be supplied with a
Communication interface option of the RS 485 type, up to
38 400 baud speed, Modbus Protocol.
The response time for a control order will be less than 15 ms
(time from order sent to the unit up to order acknowledgement)
The Protection and Control unit will communicate the metering
data, enable the remote readings of the protection settings, the
remote setting of protection and the transfer of the disturbance
recorded data.
Remote control orders shall be carried out in 2 modes :
 Direct mode
 "SBO" (select before operate) mode
Software
A RS232 connection port shall be available in the front of the
relay, allowing to communicate between the relay and a PC with
the appropriate software.
Appropriate software (using standard Windows 95 or NT
operating system) will allow to collect:
 all metering and operating data, alarm messages
 breaker diagnostics data (cumulative tripping current,
operating counter…)
 protection and parameter settings, logic status of inputs,
outputs and signal LEDs. (download to/from the relay)
 disturbance recording: single or multi curve display, 2
pointers for differential measurement, zooming, printing.
Sepam series 20 Specification form
Medium Voltage Protection Relay
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