SIPROTEC4 7UT 612 - Multiple function protection for two winding transformers
Description
The SIPROTEC 7UT6 differential protection relays are used for fast and
selective fault clearing of short-circuits in transformers of all voltage levels
and also in rotating electric machines like motors and generators, for short
lines and busbars.
The protection relay can be parameterized for use with three-phase and
single-phase transformers.
The specific application can be chosen by parameterization. In this way an optimal adaptation of the relay to the protected object can be achieved.
In addition to the differential function, a backup overcurrent protection for 1 winding/star point is integrated in the relay.
Optionally, a low or high-impedance restricted earth-fault protection, a negativesequence protection and a breaker failure protection can be used. 7UT613 and 7UT633 feature 4 voltage inputs. With this option an overvoltage and undervoltage protection
is available as well as frequency protection, reverse / forward power protection, fuse failure monitor and overexcitation protection. With external temperature monitoring boxes (thermo-boxes) temperatures can be measured and
monitored in the relay. Therefore, complete thermal monitoring of a transformer is possible, e.g. hot-spot calculation of the oil temperature.
7UT613 and 7UT63x only feature full coverage of applications without external relays by the option of multiple protection
functions e.g. overcurrent protection is available for each winding or measurement location of a transformer. Other
functions are available twice: earth-fault differential protection, breaker failure protection and overload protection. Furthermore, up to
12 user-defined (flexible) protection functions may be activated by the customer with the choice of measured voltages, currents, power and frequency as input variables.
The relays provide easy-to-use local control and automation functions. The integrated programmable logic (CFC)
allows the users to implement their own functions, e.g. for the automation of switchgear (interlocking).
User-defined messages can be generated as well. The flexible communication interfaces are open for modem communication architectures with control system.
Function overview
• Differential protection for 2- up to 5-winding transformers (3-/1-phase)
• Differential protection for motors and generators
• Differential protection for short 2 up to 5 terminal lines
• Differential protection for busbars up to 12 feeders (phase-segregated or with summation CT)
Protection functions
• Differential protection with phasesegregated measurement
• Sensitive measuring for low-fault currents
• Fast tripping for high-fault currents
• Restraint against inrush of transformer
• Phase / earth overcurrent protection
• Overload protection with or without temperature measurement
• Negative-sequence protection
• Breaker failure protection
• Low/high-impedance restricted earth fault (REF)
• Voltage protection functions (7UT613/633)
Control functions
• Commands for control of circuitbreakers and isolators
• 7UT63x: Graphic display shows position of switching elements, local/remote switching by key-operated switch
• Control via keyboard, binary inputs, DIGSI 4 or SCADA system
• User-defined logic with CFC
Monitoring functions
• Self-supervision of the relay
• Trip circuit supervision
• Oscillographic fault recording
• Permanent differential and restraint current measurement, extensive scope of operational values
Communication interfaces
• PC front port for setting with DIGSI 4
• System interface
IEC 61850 Ethernet
IEC 60870-5-103 protocol,
PROFIBUS-FMS/-DP,
MODBUS or DNP 3.0
• Service interface for DIGSI 4 (modem)/ temperature monitoring (thermo-box)
• Time synchronization via IRIG-B/DCF 77
The SIPROTEC 7UT6 differential protection relays are used for fast and
selective fault clearing of short-circuits in transformers of all voltage levels
and also in rotating electric machines like motors and generators, for short
lines and busbars.
The protection relay can be parameterized for use with three-phase and
single-phase transformers.
The specific application can be chosen by parameterization. In this way an optimal adaptation of the relay to the protected object can be achieved.
In addition to the differential function, a backup overcurrent protection for 1 winding/star point is integrated in the relay.
Optionally, a low or high-impedance restricted earth-fault protection, a negativesequence protection and a breaker failure protection can be used. 7UT613 and 7UT633 feature 4 voltage inputs. With this option an overvoltage and undervoltage protection
is available as well as frequency protection, reverse / forward power protection, fuse failure monitor and overexcitation protection. With external temperature monitoring boxes (thermo-boxes) temperatures can be measured and
monitored in the relay. Therefore, complete thermal monitoring of a transformer is possible, e.g. hot-spot calculation of the oil temperature.
7UT613 and 7UT63x only feature full coverage of applications without external relays by the option of multiple protection
functions e.g. overcurrent protection is available for each winding or measurement location of a transformer. Other
functions are available twice: earth-fault differential protection, breaker failure protection and overload protection. Furthermore, up to
12 user-defined (flexible) protection functions may be activated by the customer with the choice of measured voltages, currents, power and frequency as input variables.
The relays provide easy-to-use local control and automation functions. The integrated programmable logic (CFC)
allows the users to implement their own functions, e.g. for the automation of switchgear (interlocking).
User-defined messages can be generated as well. The flexible communication interfaces are open for modem communication architectures with control system.
Function overview
• Differential protection for 2- up to 5-winding transformers (3-/1-phase)
• Differential protection for motors and generators
• Differential protection for short 2 up to 5 terminal lines
• Differential protection for busbars up to 12 feeders (phase-segregated or with summation CT)
Protection functions
• Differential protection with phasesegregated measurement
• Sensitive measuring for low-fault currents
• Fast tripping for high-fault currents
• Restraint against inrush of transformer
• Phase / earth overcurrent protection
• Overload protection with or without temperature measurement
• Negative-sequence protection
• Breaker failure protection
• Low/high-impedance restricted earth fault (REF)
• Voltage protection functions (7UT613/633)
Control functions
• Commands for control of circuitbreakers and isolators
• 7UT63x: Graphic display shows position of switching elements, local/remote switching by key-operated switch
• Control via keyboard, binary inputs, DIGSI 4 or SCADA system
• User-defined logic with CFC
Monitoring functions
• Self-supervision of the relay
• Trip circuit supervision
• Oscillographic fault recording
• Permanent differential and restraint current measurement, extensive scope of operational values
Communication interfaces
• PC front port for setting with DIGSI 4
• System interface
IEC 61850 Ethernet
IEC 60870-5-103 protocol,
PROFIBUS-FMS/-DP,
MODBUS or DNP 3.0
• Service interface for DIGSI 4 (modem)/ temperature monitoring (thermo-box)
• Time synchronization via IRIG-B/DCF 77
