SPAU 140 C ABB Synchro-check Relay Voltage-check Relay 50Hz 250V Ac/dc

I. Key Functions
1. Synchronization Check – When both sides of the network are energized, the circuit breaker can only be closed if the voltage difference (ΔU), frequency difference (Δf), and phase angle difference (Δφ) all fall within the preset limits.
2. Voltage Check – When one side is energized and the other is not, this function verifies that the power flow direction is correct and the dead-time requirement is met, preventing load-side energization.
3. Dual Circuit Breaker Scenario – With two completely independent stages (Stage 1/Stage 2) built in, it can monitor the closing conditions of two circuit breakers simultaneously, suitable for applications such as dual busbar systems, ring main units, or generator-transformer unit configurations.

II. Key Parameter Ranges
- Voltage difference ΔU: 2%…40% × Un (1% step)
- Frequency difference Δf: 0.02…0.50 Hz (0.01 Hz step)
- Phase angle difference Δφ: 5°…50° (1° step)
- Slip cycle measurement threshold: >0.15 × Un for calculating Δf/Δφ
- Deadband time (Voltage-check tVC): 0.1…20 s
- Circuit breaker tripping time compensation tCB: 0…500 ms
- Rated voltage input: 100 V or 110 V (50/60 Hz)
- Auxiliary power supply: 80…265 V AC/DC or 18…80 V DC (Optional modules: SPFU 240R4 / SPFU 48R4)

III. Hardware and Communication Interface
- 19" 6U rack-mount enclosure, IP54 front panel; Weight ≈ 3 kg
- 8 output relay contacts: 2× heavy-duty (CB closing pulse), 6× signal (start, trip, device fault)
- Continuous hardware self-test: Internal fault <120 ms triggers IRF signal and locks output
- Rear fiber optic SPA-BUS serial port (standard), compatible with ABB LonWorks/SCADA via SPA-ZC21/17 module; supports remote reading of real-time ΔU, Δf, Δφ values ​​and event logging

IV. Typical Industry Applications
- 6 kV power plant auxiliary busbar switching/tie-breaker
- Hydro power plant generator output circuit breaker (GCB) synchronization
- 220 kV substation double busbar switching operations
- Oil platform ring main unit (DR) switchgear synchronization
- SPACOM upgrade – SPAU 140 C and SPAU 341 C are directly interchangeable on the rail; only parameter settings need to be updated

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