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ABB RET670 1MRKO02816-AC｜Transformer Protection Module｜
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- Transformer differential protection 87T
Low impedance fast differential, built-in excitation surge second harmonic braking and fifth harmonic overexcitation braking; Automatic matching of CT ratio, automatic compensation of Yd/Yyn delta winding phase offset, without the need for an intermediate converter; Support dual differential module protection for dual main transformer branches
Time limited zero sequence differential REF 87N
Neutral point low impedance grounding fault protection, sensitive detection of internal grounding short circuit in winding
High impedance bus differential extension (optional)
Complete backup protection configuration
Interphase distance protection 21 (quadrilateral/Mohorz characteristic 5-segment impedance zone)
Directional overcurrent, inverse time overcurrent, zero sequence overcurrent 3I0
Overexcitation V/Hz protection, overload heat accumulation protection, CT disconnection alarm
Low voltage side compound voltage blocking overcurrent and gap zero sequence protection
- Transformer differential protection 87T
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