MGC-7000 Governor System

MGC-7000
Governor System

The MGC-7000 is a dedicated digital governor system for Pelton turbine units. With independent multi-nozzle control, needle coordination, and deflector coordinated control, it optimizes turbine regulation performance, maintains high unit efficiency, and ensures reliable operation under complex hydropower conditions.

Product Overview
Dimensions
Control Diagram
Technical Parameter
Performance Parameter
Model Code

Overview

The MGC-7000 Series Governor is a dedicated digital governor system for Pelton turbine units. It features NSD’s proprietary needle coordination control module, enabling independent and coordinated multi-needle regulation to maintain peak unit efficiency. The system can automatically adjust the operating sequence of each needle according to its working status, significantly improving regulation performance while simplifying the mechanical control structure.

Suitable for the full range of Pelton turbine units, the MGC-7000 supports single or dual controllers and small, medium, large, and extra-large governor applications. Key configurations include independent multi-nozzle control and synchronization, deflector coordinated control, digital valve or proportional valve control, and integrated or separate electrical-mechanical cabinet designs, with simple structure, easy maintenance, reliable operation, and low noise.

Dimenensions

Overall dimensions drawing of the MGC-7000 electrical control cabinet

Control Diagram

Technical Parameter

Specifications	Technical Data
Cabinet Features
Integrated electrical-mechanical cabinet dimensions	800 × 800 × 1860 mm (L × W × H), customizable
Separate electrical cabinet dimensions	600 × 800 × 2260 mm or 800 × 800 × 2260 mm (L × W × H)
Cabinet weight	300 kg
Standard AC operating voltage	AC 220 V ±15%
Standard DC operating voltage	DC 110 V ±10%, DC 220 V ±15%
Load capacity	2200 W (VA)
Dielectric withstand test	1.5 kV, 1 min
Protection degree	IP65
Operating temperature range	-40 to 65°C
Insulation resistance	>10 MΩ
Leakage current	<1 mA
Control Signal Output
Servo motor	Servo motor driver output
Proportional valve	Analog current channel, 4–20 mA
Input Characteristics
Digital input	DC 24 V, LED indicator, fully isolated
Analog input	Voltage 0–10 V, current 4–20 mA, LED indicator, fully isolated
Output Characteristics
Digital output	DC 24 V, LED indicator, fully isolated
Analog output	Voltage 0–10 V, current 4–20 mA, LED indicator, fully isolated
Frequency Measurement Specifications
Measurement method	Frequency measured by controller body
Grid frequency	AC 30–150 V, 90–110% rated frequency
Unit frequency	AC 0.3–150 V, 7.8–110 Hz
Gear-disc speed measurement	Non-contact proximity switch, DC 24 V supply, 1–110 Hz
Frequency measurement resolution	0.001 Hz
Frequency measurement channels	Residual unit voltage frequency, system frequency, unit gear-disc speed

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
Number of oscillation peaks after load rejection	≤ 2
Ratio of unit load rejection time tE to water inertia time tM	< 12
Minimum relative speed after load rejection	> 90%
Ratio of tSR to t0.8	< 5
Servomotor dead time	< 0.2 s
Automatic startup time in generation mode	20–120 s, adjustable
Governor System Parameter Settings
Permanent speed droop adjustment range	0–10%
Speed droop adjustment range	0–10%
Online adjustable manual frequency dead band	0 to ±1.5%
Speed adjustment range	90–110%
Power adjustment range	0–105%
Adjustment time from no-load to full-load	20–300 s
Servomotor deviation during operation mode switching	< 0.3%
Servomotor deviation during dual-power supply switching	< 0.1%
Servomotor deviation during dual-controller switching	< 0.1%
Proportional gain Kp range	0–20
Integral gain Ki range	0.01–10 1/s
Derivative gain Kd range	0.01–10 s
Governor system availability	≥ 99.99%
Mean time to first failure	≥ 30,000 h

Model Code