DEIF DLQ144-PC-NB

Product Name: DEIF DLQ144-PC-NB — Generator Protection & Synchro-Check Relay, 144 mm panel mount
Product Introduction: Full-feature generator protection, metering and synchronizing relay in a 144 × 144 mm fascia. Suitable for larger gensets requiring detailed protection, kW/kVar measurement, and breaker control. “-PC-NB” indicates extended digital I/O and Modbus communications without built-in analog retransmission (NB = no analog outputs).

Category: Others

Description

Technical Specifications:
- Display: Large graphical LCD with mimic diagram
- Voltage inputs: 3× Ph-Ph or Ph-N, 57 … 690 V AC CAT III (via PT)
- Current inputs: 1 A / 5 A CT secondary, programmable CT ratio
- Measured parameters: V_LL, V_LN, I_a,b,c, kW, kVar, kVA, PF, Hz, kWh, kVarh
- Protection functions: 51/51N OC, 27/59 UV/OV, 81U/81O UF/OF, 32 reverse power, 40 loss of excitation (option), 46 negative seq., 21 distance (option on some FW), sync check (25)
- Digital I/O: typically 10–12 DI, 6–8 DO (NO/NC relay contacts, 5 A / 250 V AC)
- Communication: RS-485 Modbus RTU (standard), optional Ethernet
- Supply: 24 V DC (18–32 V DC) or 110/230 V AC
- Accuracy: ±0.2–0.5 % (voltage & current), ±0.01 Hz (frequency)
- Panel cutout: 138 × 138 mm (DIN 43700 size 144 × 144 mm bezel)
- Operating temp.: –20 … +70 °C; storage –40 … +85 °C
Features: Synchronizing functions (voltage difference, slip frequency, phase angle check), circuit breaker close command output, extensive event/fault recording (disturbance recorder), password levels, multi-language UI.
Application: Prime power gensets > 500 kW, paralleling switchgear, CHP plants, marine main/gen sets.
Installation & Notes: Requires correct PT & CT ratio entry before commissioning. Use separate shielded cables for analog (CT/VT) and digital (DI/DO/comm) wiring. Maintain minimum creepage distances. Follow local electrical code for protective conductor sizing.

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