Transformer Differential Protection
General Information
- Description
The SIPROTEC 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.
7UT613
Differential protection relay for transformers, generators, motors and busbars; housing 1/2 19"; 5 BI, 8 BO, 1 live status contact, 11 I, IEE
- Description
- Function overview
The SIPROTEC 7UT613 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 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 negative-sequence protection and a breaker failure protection can be used. With external temperature monitoring boxes a maximum of 12 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.
The protection relay can be parameterized for use with three-phase and single-phase transformers.
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.
Alternatively to the conventional overload protection, the relay can also provide a hot spot calculation acc. to IEC60435.
- Function overview
- Differential protection for 2 or 3 winding transformers (3-/1-phase)
- Differential protection for motors and generators
- Differential protection for short 2 up to 3 terminal lines
- Differential protection for busbars up to 9 feeders (phase-segregated or with summation CT)
- Protection functions
- Differential protection with phase-segregated measurement
- Sensitive measuring stage 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-or high-impedance restricted earth fault (REF)
- Overexitation protection
- Control functions
- Commands f. ctrl. of c.b. and isolators
- 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
- Communication interfaces
- PC front port for setting with DIGSI 4
- System interface protocols - IEC 60870-5-103 - PROFIBUS-FMS/-DP - MODBUS - DNP 3.0
- Service interface for DIGSI 4 (modem)/temperature monitoring (thermo-box)
- Time synchronization via IRIG-B/DCF 77
