Transformer Differential Protection

7453311

Description

Industrial protection relay for monitoring the transformer (745 50) according to the protection principle of differential protection. The relay measures input and output currents of the transformer via an internal matching current transformer and trips in case of short circuits between windings and windings as well as in case of earth faults. The operating status and tripping are indicated by means of a display. In addition, the relay detects operating states outside the protection range, which must not lead to the transformer being switched off. In addition to the differential protection, the device offers various communication and reserve protection functions.

USB connection on the front for "Smart View SE" (included in delivery).

Programming and parameterization is done with the "Smart View SE" software.

Technical data

Protection functions (ANSI ) 7453311
Phase current prot. (non-directional) (50/51) 4
Generator or Transformer differential protection (87G/87T) Yes
Restricted earth fault protection 87N (64REF) 2
Earth current elements (non-directional) (50N/51N) 4
Negative sequence current prot. (DEFT/INV) (46) 2
Overload protection with thermal replica (49) Yes
Inrush detection (2nd harmonic) () Yes
Current transformer supervision (60L) Yes
Load blinder - ()Yes
Circuit breaker failure protection (50BF/62BF) Yes
Trip circuit supervision (74TC) Yes
Lockout function ( 86) Yes
Protection parameter sets () 4
Reverse interlocking () Yes
Event, failure and disturbance recorder () Yes

Measuring functions

Currents () Yes
Thermal overload θ () Yes
Trend recording () Yes
Statistic measuring functions (min, max and avg values)
Currents () Yes
Thermal overload θ () Yes

Rated current: 1 A, 5 A
Rated frequency: 50...60 Hz
Auxiliary voltage: 48...230 V AC or 24...270 V DC
Output contact: 2 x CO
Digital in: 5

Transformer Differential Protection

Description

Technical data

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