z set protection, control, monitoring in one of the intelligent electronic equipment, its powerful protection function, flexible protection configuration and extensible hardware design can meet the specific requirements of users
z can be used in power transformers, autotransformer, parallel reactance, T-zone protection, transformer group, shift voltage and small bus system
z can be used for two – and three-reel transformers, up to 6 groups of current braking
z can be used for single/multiple circuit breaker connection
z transformer differential protection:
– Use proportional braking features for traversal failures
– Waveform discrimination and second harmonic braking principle for transformer excitation inrush current
– Fifth harmonic braking principle is adopted for overexcitation
– High sensitivity interturn short circuit protection
z zero sequence current differential protection for all transformer windings directly grounded or grounded by low impedance:
– Great speed
– High sensitivity
– Based on high impedance and low impedance principles
Phase-to-phase and grounding distance protection of the whole scheme from z to 5 stages:
– Optional quadrilateral and ohmic circle characteristics
– Sensitive directional grounding protection for high resistance grounding systems
– Load impedance intrusion detection function
z Power system oscillation detection (including additional logic)
Z-direction power protection
– Power backward and forward Low power, over active and reactive power protection
– With phase Angle compensation
– Two stage exit (alarm/trip)
z High speed transient short circuit protection for low transient override
z each side winding has 4 sections of directional overcurrent protection:
– Each paragraph can be set to reverse or fixed time
– Each segment can be set with or without direction
z each side winding has 4 sections of zero sequence direction overcurrent protection:
– Voltage, current, or dual polarization
– Each paragraph can be set to reverse or fixed time
– Each segment can be set with or without direction
– Two harmonic latches can be set for each segment
z Simultaneous and no voltage detection function, suitable for single/multiple circuit breaker connection:
– Charging direction is optional
– Two feature blocks with built-in concurrent voltage selection
– Automatic or manual simultaneous detection, and may have different setting values