MGC-4000
Governor System

An advanced digital governor system designed for medium, large, and extra-large hydropower units. The MGC-4000 features dual-controller hot standby redundancy, high fault tolerance, and reliable hydraulic control performance, ensuring stable, safe, and precise turbine regulation under demanding operating conditions.

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NSD MGC4000 governor system control cabinet for hydropower turbine regulation

Overview

The MGC4000 series, based on the MGC3000 platform, features dual-controller cross-redundant hot standby, fault-tolerant design, anti-interference protection, and high-performance switch-mode power supply. It also includes overvoltage, transient voltage, and shielding protection, ensuring high safety, reliability, fault tolerance, and stability.

Combined with asymmetrical redundant main pressure valves and automatic centering technology, the MGC4000 achieves internationally advanced performance and stability. It is the main choice for medium, large, and ultra-large hydropower units, suitable for Francis, Kaplan, and bulb turbines with single or double regulation.

NSD MGC4000 governor system control cabinet for hydropower turbine regulation

Dimenensions

English dimensions drawing of the MGC4000 cabinet showing front, side and rear views with measurements.

Control Diagram

English control principle diagram of the MGC4000 governor system showing PLC, actuator, hydraulic control and generator network connections.

Technical Parameter

SpecificationsTechnical Data
Cabinet Features
Integrated electrical-mechanical cabinet dimensions800 × 800 × 1860 mm (L × W × H), customizable
Separate electrical cabinet dimensions600 × 800 × 2260 mm or 800 × 800 × 2260 mm (L × W × H)
Separate mechanical cabinet dimensions800 × 800 × 1860 mm (L × W × H), customizable
Cabinet weight300 kg
Standard AC operating voltageAC 220 V ±15%
Standard DC operating voltageDC 110 V ±10%, DC 220 V ±15%
Load capacity2500 W (VA)
Dielectric withstand test1.5 kV, 1 min
Protection degreeIP65
Operating temperature range-40 to 65°C
Insulation resistance>10 MΩ
Leakage current<1 mA
Control Signal Output
Stepper motorStepper motor driver output
Servo motorServo motor driver output
Proportional valveAnalog current channel, 4–20 mA
Input Characteristics
Digital inputDC 24 V, LED indicator, fully isolated
Analog inputVoltage 0–10 V, current 4–20 mA, LED indicator, fully isolated
Output Characteristics
Digital outputDC 24 V, LED indicator, fully isolated
Analog outputVoltage 0–10 V, current 4–20 mA, LED indicator, fully isolated
Frequency Measurement Specifications
Measurement methodFrequency measurement by controller body
Grid frequencyAC 30–150 V, 90–110% rated frequency
Unit frequencyAC 0.3–150 V, 7.8–110 Hz
Gear-disc speed measurementNon-contact proximity switch, DC 24 V power supply, 1–110 Hz
Frequency measurement resolution0.001 Hz
Frequency measurement channelsUnit residual voltage frequency, system frequency, unit gear-disc speed measurement

Performance Parameter

Specifications Technical Data
Stability Performance
Relative speed fluctuation of generating unit< ±0.15%
Stable fluctuation of guide vane opening< 0.1%
Maximum nonlinearity of static characteristic curve< 0.3%
Speed dead band< 0.02%
Dynamic Characteristics
Peak value during load rejection≤ 2
Guide vane (tE) to water inertia time (tM) ratio< 8
Blade closure time for long-time units (tE) to (tM) ratio< 12
Minimum relative speed after load rejection90%
Speed rise time (tSR) to response time (t0.8) ratio< 5
Relay inaction time< 0.2 s
Blade follow-up accuracy for double-regulation units< 0.3%
Automatic startup time20–120 s
Governor System Parameter Settings
Steady-state slip coefficient adjustment range0–10%
Slip rate adjustment range0–10%
Manual frequency dead band online adjustment range0–±1.5%
Speed adjustment range90–110%
Power adjustment range0–105%
No-load to full-load adjustment time20–300 s
Relay variation during operating mode switching< 0.3%
Relay variation during dual-power switching< 0.1%
Relay variation during dual-controller switching< 0.1%
Proportional gain Kp range0–20
Integral gain Ki range0.01–10 (1/s)
Derivative gain Kd range0.01–10 s
Governor system availability≥ 99.99%
Mean time to first failure≥ 30,000 h

Model Code

English configuration code guide for the MGC4000 governor model, explaining governor type, microcontroller type and electro-hydraulic transducer options.