Introduction

For facilities that depend on prime or standby power, speed regulation is one of the most decisive performance indicators of a diesel generator set. A unit that cannot hold frequency steady under sudden load swings risks damaging sensitive equipment and disrupting operations. The 200kW Weichai Diesel Generator Set, produced under the Minlong Diesel Generator Set Weichai Engine brand, is engineered specifically to address this need, combining a governor-controlled Weichai engine core with configurable alternator options to deliver consistent frequency and voltage performance across 50 Hz and 60 Hz applications.

Engineering Foundation Built Around a Weichai Power Core

At the heart of this generator set is the Weichai WP10D264E200 engine for 50 Hz operation and the WP10D264E201 for 60 Hz operation. Both are turbocharged and intercooled, L-type 6-cylinder, four-stroke engines with a displacement of 9.726 L and a bore x stroke of 126 x 130 mm, running at a compression ratio of 17:1. The engine delivers 264 kW standby power and 240 kW prime power at both 1500 rpm and 1800 rpm, giving the set flexibility to serve both 50 Hz and 60 Hz markets without redesigning the core platform.

Governor-Controlled Speed Stability

A key contributor to good speed regulation is the engine's mechanical pump / electronic governor fuel system. This governor continuously manages fuel delivery to maintain target rotational speed, which directly underpins the set's frequency stability. At 1500 rpm, the engine consumes 47.59 kg/h of fuel at 100% output, while at 1800 rpm consumption is 47.81 kg/h at 100% output — figures that remain consistent across the load range from 25% to 100%, reflecting stable combustion and speed control at every operating point.

Frequency and Voltage Regulation Performance

The generator set's regulation capability is defined by clear, quantified performance limits rather than general claims. The frequency adjustment range is ≥±5% adjustable, and the frequency fluctuation rate is held to ≤±0.25% under steady operation. Under abrupt load changes — the true test of speed regulation — the transient frequency deviation stays within ≤+8% on a full 100% load rejection and ≤-5% on a 40% load acceptance, with the system recovering within ≤1.48 s and ≤1.35 s respectively.

Voltage regulation follows a similarly disciplined profile. The voltage setting range is ≥±10%, with a steady-state voltage regulation rate of ≤0.5%. On 100% load rejection, transient voltage deviation remains within ≤+17%, stabilizing within ≤2.8 s; on 40% load acceptance, deviation stays within ≤-6.5%, stabilizing within ≤2.5 s. Together, these frequency and voltage figures demonstrate that the set is built to respond predictably to real-world load fluctuations rather than only performing well under laboratory-steady conditions.

Flexible Alternator Options for Global Voltage Standards

The 200kW Weichai Diesel Generator Set is offered with a choice of alternator brands — GZSTF POWER STF200-1-4, Leroysomer TAL-A46-D, Leroysomer TAL-A44-M, or Stanford N250G4 — all capable of maintaining 200 kW / 250 kVA prime output at either 50 Hz or 60 Hz. Each alternator option shares common technical characteristics: 3-phase, three-phase four-wire, Y-type winding, single bearing, IP21 protection, brushless self-excitation, and H/H insulation and temperature rise level, with an efficiency of ≥95%. The power factor is 0.8, and the maximum overspeed rating is 2250 RPM/min, providing a safety margin during transient events.

Electrical output is available in three configurations to match different regional standards: 230/400 V at 50 Hz with 360.9 A, 120/208 V at 60 Hz with 694 A, and 277/480 V at 60 Hz with 300.7 A — all rated at 200 kW / 250 kVA prime and 220 kW / 275 kVA standby. This alternator flexibility allows the same core platform to serve customers with different regional voltage and frequency requirements without compromising the rated output.

Environmental Adaptability and Derating Guidance

Real-world deployment often means operating outside ideal laboratory conditions, and the generator set's specifications account for this directly. Above 1500 m altitude, output power decreases by 4% for every 300 m increase; above 40°C ambient temperature, output decreases by 3% for every 10°C increase. The alternator's rated altitude requirement is ≤1000 m, reinforcing the importance of applying these derating figures for higher-altitude or hotter installation sites. This transparent derating guidance helps operators plan capacity accurately rather than discovering shortfalls after installation.

Comprehensive Documentation and Quality Assurance

Every unit is supported by a full documentation package, including the engine parts catalog and original factory information, generator set maintenance record manual, generator original factory information, generator set installation and operation manual, control system original factory information, installation and commissioning acceptance receipt, factory test report, and certificate of origin. The set is built to a broad set of quality standards: GB/T 2820.1~6-2009, GB/T 2820.8~10-2002, GB/T 2820.12-2002, JB/T 10303-2001, JB/T 2819-1995, JB8587-1997, ISO8528, ISO3046, ISO9001, ISO14001, and CE.

Configurable Delivery Models and After-Sales Support

Beyond the standard configuration, the 200kW Weichai Diesel Generator Set can be delivered as a rain-proof unit, silent type unit, trailer type unit, vehicle-mounted power generation vehicle, or with a marine cooling system, addressing varied site and operating environments. The silent type variant has external dimensions of 4000 x 1450 x 2150 mm. Optional add-ons extend further into engine accessories (such as an intermediate cold water heater, oil preheater, and air starting motor), alternator accessories (including anti-condensation heaters, PMG excitation systems, and RTD temperature sensors), electrical system upgrades (such as ATS automatic load transfer screens and fully automatic parallel screens for multiple units), and cooling system options (including heat exchangers, remote water tanks, and split water tanks).

Each unit is factory tested before delivery, and the warranty period is 12 months after generator set commissioning acceptance or 1000 operating hours, whichever occurs earlier.

Conclusion

Taken together, the 200kW Weichai Diesel Generator Set demonstrates that dependable speed regulation is not a single feature but the result of coordinated engineering across the engine governor, alternator design, and clearly defined voltage and frequency response limits. Combined with configurable alternator brands, environmental derating transparency, complete documentation, and flexible delivery formats, this generator set is positioned as a well-documented, technically transparent option for organizations that require predictable performance under both steady and transient load conditions.