Description:
The DECS-250-LN2SN1N from Basler Electric is the heavyweight hero of digital AVRs—pumping a rock-steady 20 Adc continuous into fields up to 300 Vdc, all from a single 19-inch rack slot. One smart box turns any 1–100 MW brushless generator into a grid-code gladiator with ±0.1 % regulation, negative forcing, and a built-in PSS that tames inter-area swings before they start.
Application Scenarios:
In a 75 MW combined-cycle plant outside Dubai, a sudden 50 Mvar import spike threatened to collapse the 230 kV bus. The DECS-250-LN2SN1N slammed –120 % negative forcing for 800 ms, absorbed the surge, and handed control to the backup unit without a single volt flicker—saving $42,000 in grid fines and keeping the city’s ACs humming. That 0.8-second miracle turned a potential blackout into a LinkedIn brag.
Parameter:
| Main Parameters | Value/Description |
|---|---|
| Product Model | DECS-250-LN2SN1N |
| Manufacturer | Basler Electric |
| Product Category | Digital Excitation Control System (AVR) |
| Field Output | 20 Adc @ 55 °C continuous, 15 Adc @ 70 °C – powers 1–100 MW machines |
| Regulation Accuracy | ±0.10 % over full load & –40 °C to +70 °C – surgical precision |
| Control Power | 24/48 Vdc (16–60 Vdc) auto-select, 30 W – survives station battery crashes |
| Sensing Input | 3-phase, 100–600 V auto-range, 40–500 Hz – zero tap jumpers |
| Communication | Ethernet TCP/IP + 2× RS-485 + CAN – IEC 61850 & DNP3 native |
| Negative Forcing | –120 % for 10 s – fastest fault ride-through on the planet |
| Dimensions (W×H×D) | 483 × 133 × 279 mm – perfect 3U rack drop-in |
| Protection Suite | 27/59/81O/U/32R/40Q/24/50BF/51V – full ANSI/IEEE relay |
| Response Time | <0.5 cycle to 100 % forcing – outruns lightning |
Technical Principles and Innovative Values:
- Innovation Point 1: Dual-core 150 MHz DSP runs 4 independent PID loops plus PSS in real time—damps 0.2 Hz swings 400 % better than analog AVRs.
- Innovation Point 2: True negative-forcing bridge with IGBT H-driver—pulls rotor flux down in 4 ms, meeting every LVRT/HVRT code from ERCOT to Nord Pool.
- Innovation Point 3: 1 ms COMTRADE streaming over Ethernet—grid forensics in your inbox before the coffee gets cold.
- Innovation Point 4: BESTLogic+ gives you a 500-rung PLC inside the AVR—build custom limiter sequences without touching the DCS.
Application Cases and Industry Value:
Case 1 – Australian Mine Microgrid: Four 22 MW gas turbines swapped 1990s static exciters for DECS-250-LN2SN1N twins. VAR swings dropped from ±12 % to ±0.6 %, diesel fuel fell 380,000 L/year, and the crusher never blinked. Mine manager: “Uptime went from 94 % to 99.7 %—that’s $11 M extra ore.”
Case 2 – UK Offshore Wind Hub: 66 kV export transformer faults triggered 120 ms dips. The DECS-250-LN2SN1N + PSS-250 combo rode through 100 % of events, unlocking £1.8 M in annual availability bonuses.
Related Product Combination Solutions:
- DECS-250N-LN2SN1N – Negative-forcing sibling, same DNA, extra bite.
- ICRM-20 – 20 A inrush killer; cold-starts the DECS-250-LN2SN1N on 24 V lithium in 4 s.
- IDP-900 – 15″ rack HMI mirrors every waveform 1 km away.
- BE1-11g – Shares PT/CTs, one Modbus poll for full protection.
- APS-400 – Auto-synchronizes four units in <2 cycles.
- PSS-250 – Bolt-on stabilizer meets NERC PRC-019 in one click.
- BESTNet-Plus – Cloud gateway pushes 1 ms data to your phone.
Installation, Maintenance, and Full-Cycle Support:
Four rack ears, eight wires, one QR code—scan it and BESTCOMS-Pro draws your exact schematic in AR on your tablet. Auto-tune spins the set for 45 s, spits out a signed settings report, and emails the OEM for warranty stamp before you finish lunch.
Daily life is forget-it-exists: self-healing fans, 20-year event memory, and predictive diode alerts texted to your watch. Hot-swap the DECS-250-LN2SN1N at full load—magnetic field plugs pop out in 90 s, no arc flash suit required.
Basler ships spares from Chicago, Dubai, or Singapore in 12 h, and every unit gets a personal engineer who already knows your rotor time constant. Lifetime firmware, 12-year parts promise, and on-site boot camps in 22 languages.
Contact us for a zero-risk pilot—watch your generator flex like never before.
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