Transformer Specification
Protection
Metering
Man Machine Interface (front panel)
Control and monitoring
Communication
Software /
Transformer specification
(Low power transformer)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
60068-2-52 Salt mist
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 and CSA 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
The Protection and Control Unit shall contain all the necessary protections for the specific application:
Transformer protection
- 50/51 Phase overcurrent
- 50N/51N Earth fault (or neutral)
- 46 Unbalance / negative sequence
- 49 RMS thermal overload
- Thermostat / Buchholz
- Temperature monitoring
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 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.
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.
Each Protection and Control unit shall include the
measurements needed for operation and commissioning, i.e. at
least the following :
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
EnglishLocal
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.
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.
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 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.
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
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.
Protection and control unit
Protection
Metering
Man Machine Interface (front panel)
Control and monitoring
Communication
Software /
Transformer specification
(Medium power transformer)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
60068-2-52 Salt mist
The operating temperature shall be between -25°C and + 70° C.
The Protection and Control unit range 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 and CSA 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
The Protection and Control Unit shall contain all the necessary protections for the specific application:
Transformer protection
- 50/51 Phase overcurrent
- 50N/51N Earth fault (or neutral)
- 50BF Breaker failure
- 46 Unbalance / negative sequence
- 67 Directional overcurrent
- 67N/67NC Directional earth fault
- 49 RMS thermal overload
- 27 Undervoltage (phase-to-phase or phase-to-neutral)
- 59 Overvoltage (phase-to-phase or phase-to-neutral)
- 59N Neutral voltage displacement
- 47 Negative sequence overvoltage
- 81H Overfrequency
- 81L Underfrequency
- Thermostat / Buchholz
- Temperature monitoring
particular for current protections, providing a choice of curve
types between definite time curve (DT), with time delay settings from instantaneous 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 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.
The protection and control unit shall include learnt cooling time constant.
Alternative overload setting groups will be selectable by logical conditions to adapt operating mode change.
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.
The protection and control unit shall include voltage transformer and current transformer circuit supervision.
Each Protection and Control unit shall include the
Measurements needed for operation and commissioning, i.e. at
least the following :
RMS 3-phase current measurement
residual current measurement
average and maximum phase current demand
measurement of fault current broken in each phase
Measurement of voltage, frequency, power and energy. For power and energy data, the unit shall measure real and reactive values and takes into consideration the direction energy flow. In addition, the protection and control unit shall include 4 logic inputs allowing energy measurement by means of impulses coming from an external meter.
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 (opened/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
EnglishLocal
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.
The Protection and Control unit shall include the logic inputs
and outputs resources required for control of the breaking devices (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
Modification of the control logic program by using logic equation editor.
storage of information (even during control power supply
outages).
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, 8 or 16 temperature sensors inputs shall be available (motors, transformers, generators)
Disturbance recording:
Triggered on event (automatic or manual)
Each record will allow to store data for at least 400 periods, 12 values per period, with a number of periods before the event according to the setup
Total recording time will be 800 periods
The content of the record will be, as a minimum, the date, channel characteristics, 4 current channels (I1, I2, I3, I0), 3 voltage channels and the digital inputs
The event format shall be COMTRADE 97
The unit will provide time-tagging of minimum 200 events within an accuracy of 1ms.
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
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.
Protection and Control unit
Protection
Metering
User Machine Interface
(front panel)
Control and monitoring
Communication
Software /
Transformer specification
(High power transformer)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
60068-2-52 Salt mist
The operating temperature shall be between -25°C and + 70° C.
The Protection and Control unit range shall be designed to
accommodate all types of control power supply voltages: 24,
48, 127 & 220 Vdc.
The design and manufacturing process shall be ISO 9001
certified.
The Protection and Control Unit shall have UL 508 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 (<210 mm)
remote optional modules shall be prewired
The Protection and Control Unit shall contain all the necessary protections for the specific application:
Transformer protection
- 50/51 Phase overcurrent
- 50N/51N Earth fault (or neutral)
- 50BF Breaker failure
- 46 Unbalance / negative sequence
- 67 Directional overcurrent*
- 67N/67NC Directional earth fault*
- 32P Reverse real power
- 49 RMS thermal overload
- 24 Overfluxing
- 27 Undervoltage (phase-to-phase or phase-to-neutral)
- 27D Positive sequence undervoltage
- 27R Remanent undervoltage
- 59 Overvoltage (phase-to-phase or phase-to-neutral)
- 59N Neutral voltage displacement
- 47 Negative sequence overvoltage
- 81H Overfrequency
- 81L Underfrequency
- 87T 2 windings current differential*
- 64REF Restricted earth fault
- Thermostat / Buchholz
- Temperature monitoring