DEIF TAP‑210DG/3 Transformer Differential Protection Relay

Technical Specifications

Model:TAP‑210DG/3

Brand:DEIF

System compatibility:Uni‑line series ratio‑stabilised differential protection relay for two‑winding power transformers,ANSI 87T. Requires CT installation on primary side and secondary side of transformer. Built‑in second‑harmonic inrush blocking function to avoid mal‑tripping during transformer energization. Suitable for marine and industrial power distribution system,cooperates with other Uni‑line protection relays to build complete protection solution.

Function:Hardware‑based stabilised differential protection relay. Compares primary‑side and secondary‑side CT current signals of transformer. Ratio‑brake characteristic restrains action under external through‑fault conditions. Second‑harmonic restraint blocks tripping on magnetizing inrush current during transformer switch‑on. Front‑panel potentiometers adjust differential threshold,restraint slope and trip delay. Two change‑over relay outputs:one for trip command,the other for fault alarm signal. No PC configuration software required,all parameters set locally via potentiometers.

Installation:35 mm DIN‑rail mounting or base screw mounting inside switchgear cabinet

Interface:

‑Terminal block:two‑winding three‑phase CT current input

‑2 sets change‑over relay output terminals(trip and alarm signal)

‑Front‑panel potentiometers for differential threshold,restraint slope and trip‑delay adjustment

‑LED status indicators for power supply,inrush blocking,differential fault and relay action

Circuit feature:Analogue hardware measuring logic,surge suppression for CT input terminals,galvanic isolation between input‑output‑auxiliary power supply,second‑harmonic filter circuit for inrush detection.

Feature:Marine classification approved;relay contact rating 250VAC / 24VDC,8A resistive load. CT polarity and ratio matching must be strictly verified during commissioning. Optimized for two‑winding transformer,does not support three‑winding transformer application.

Diagnostic:Front‑panel LED reflects power supply,inrush blocking active,differential fault detection and relay tripping status. Independent alarm contact provides remote fault signal.

Power supply:24VDC(18‑32VDC),typical power consumption 3.2W

Protection class:IP20

Horizontal operating temperature:‑25℃ ~ +70℃

Storage temperature:‑40℃ ~ +85℃

Relative humidity:5%‑95% non‑condensing

Shock & vibration:Complies with DNV marine environmental requirement

Weight:0.74kg

Dimensions:145mm ×110mm ×75mm

Certification:DNV,CE,marine type approval

Built‑in function

TAP‑210DG/3 stabilised differential relay detects internal short‑circuit faults of two‑winding transformer. Second‑harmonic restraint prevents false tripping caused by magnetizing inrush current during transformer energization. Outputs trip contact to open upstream breaker when internal fault occurs. Widely used for marine and industrial power distribution protection cabinet spare‑part replacement.

Product Brief

TAP‑210DG/3 belongs to DEIF Uni‑line series spare‑part family,ratio‑stabilised transformer differential relay with inrush blocking function for two‑winding transformer. CT polarity and ratio matching must be checked before commissioning. Parameters adjusted by front‑panel potentiometers without configuration software. Widely applied for power‑equipment maintenance and renovation. ESD anti‑static protection shall be followed during installation.