Complete Electrical Systems
for Hydropower & Substations

Standards Compliance

• GB 3906-91 (3-35kV AC Metal-clad Switchgear)
• IEC 298 (AC Metal-clad Switchgear and Control)
• GB/T 11022 common specifications for HV switchgear

Key Components

• FZN21-12 vacuum load switch (12kV, 630A)
• FZRN21-12 vacuum load switch + fuse combination
• RN2-10 high-voltage current-limiting fuse
• JDZ-10 voltage transformer for metering/protection
• HYSWS composite metal-oxide surge arrester
• GSN-10 live-line voltage indicator
• LZZB6-10 / LZZX-10 current transformer

Dielectrical Strength

• 1-min power-frequency withstand: 42 kV (phase-to-phase, to-ground, across vacuum gap)
• Lightning impulse withstand: 75 kV
• Isolating gap: 48 kV power frequency / 85 kV impulse

Operating Conditions

• Ambient temperature: -25°C to +40°C
• Altitude: ≤1000 m
• Relative humidity: daily avg ≤90% (+25°C)
• Free from corrosive or flammable gases, water vapor, dust

Protection Degree

• Cabinet enclosure: IP2X (complies with "Five-Prevention" interlock requirements)
• Mechanical interlock between internal switch and partition

Typical Applications

• Small/medium factories and substations (10kV)
• Residential complexes, high-rise buildings
• Schools, parks, ring-network power supply and terminal distribution

Standards Compliance

• IEC 298, GB 3906, DL/T 404
• Five-Prevention interlock system: prevents load-switch, misclose, mis-open, mis-entry to live compartment, and mis-grounding

Circuit Breaker Compatibility

• VD4 (ABB type) vacuum circuit breaker
• VS1 (domestic type) vacuum circuit breaker
• Rated breaker current: 630A / 1250A / 2000A / 3150A

Detailed Circuit Breaker Specs

Parameter	Value
Rated voltage	3.6 / 7.2 / 12 kV
1-min power frequency withstand	24 / 32 / 42 kV
Lightning impulse withstand	40 / 60 / 75 kV
Rated current	630 / 1250 / 1600 / 2000 / 2500 / 3150 A
Symmetrical short-circuit breaking	16 / 20 / 25 / 31.5 / 40 kA
4s short-time withstand	16 / 20 / 25 / 31.5 / 40 kA
Peak withstand	40 / 50 / 63 / 80 / 100 kA
Mechanical life	20,000 operations
Operating sequence	O - 0.3s - CO - 180s - CO
Closing time (rated voltage)	≤50 ms
Average opening speed	0.9 - 1.2 m/s
Average closing speed	0.6 - 0.8 m/s

Busbar Configuration

• Single busbar or single busbar with sectionalizer
• Self-bus or external-bus option

Typical Applications

• Power plants, substations (3.6-12kV secondary distribution)
• Industrial enterprises receiving/transforming power
• Large motor starting and control

Standards Compliance

• IEC 60439-1, GB 7251.1-1997, JB/T 9661-1999

Cabinet Configuration

• JX (Incoming Line Cabinet) / ML (Bus Coupler) / KD (Feeder Cabinet)
• Horizontal busbar chamber (top), vertical busbar chamber (rear)
• Functional unit chambers (draw-out type), cable chamber (right)
• Compartments isolated; prevents fault propagation

Detailed Parameters

Protection Functions

• Short-circuit instantaneous, short-time delay, overload (3-stage)
• Undervoltage, open-phase protection
• Self-reset, non-self-reset, switching device options
• Three-stage protection with downstream breaker coordination
• Automatic busbar transfer (when sectionalized)

Component Compatibility

• ME (DW17), DWX15C, DZ20 molded-case circuit breakers
• QSA knife switches, CJ20 contactors
• NT knife-blade fuses
• Can integrate other components per user requirements

Operating Conditions

• Altitude ≤2000 m
• Ambient temperature -5°C to +40°C (24h avg ≤35°C)
• Relative humidity ≤85%
• Installation tilt ≤5°
• Storage/transport: -25°C to +55°C

Cabinet Construction

• 25 mm pitch modular C-type steel enclosure
• Epoxy powder electrostatic spray coating
• High strength, lightweight, durable

Parameter	Value
Horizontal busbar rated current	2500 A / 3150 A
Vertical busbar rated current	630 / 800 / 1000 A
Main circuit plug-in contact rated current	200 / 400 A
Auxiliary circuit rated current	16 A
Feeder circuit rated current	≤1600 A
Receiving circuit rated current	1000 / 1600 / 2000 / 2500 / 3150 A
Rated short-time withstand (1s)	15 / 30 / 50 kA
Rated peak withstand	30 / 63 / 105 kA
Electric motor control power	0.45 - 155 kW (special order up to 155kW)
Dielectric strength	2500 V / 1 min
Protection degree	IP40
Mechanical life (draw-out unit)	100 cycles

I/O Type	Unit (LCU1-N)	Common (LCU)
DI (Digital Input)	96	96
SOE (Sequence of Events)	32	32
AI (Analog Input)	16	32
DO (Digital Output)	64	64

PLC Platform

• Mitsubishi FX series (LCU1-LCUN type)
• Communication via RS232/RS485 to color touchscreen + group PLC
• Touch screen for parameter setting and data input

Microcomputer Speed Measurement

• Input: PT signal 0-100V, frequency 0-75Hz
• Power: DC110V / AC220V
• Output: ≥6 channels (via RS-485)

Temperature Intelligent Detection

• Per LCU equipped with 1 device
• CU50 / PT100 temperature sensors
• ≥16 measurement points
• Multi-channel temperature overrun alarm
• RS-485 communication to management computer

Automatic Synchronization

• Per plant substation equipped with multi-point automatic synchronization device
• Complete N+1 generator automatic synchronization parallel operation
• 110kV (or 35kV) line automatic synchronization
• Manual synchronization operation backup
• Generator online voltage transformer (or rotating transformer)
• Automatic speed/voltage matching to system standard

Power Supply

• Upper machine: 1-2 sets 1kVA AC/DC dual-input switching regulated power supply
• GPS clock synchronization (24h error ≤0.001s)
• Communication management machine + remote SCADA support

Operator Workstation

• Monitoring center control room: 1 set operator workstation
• Piano-type configuration, can place 4 operators
• 2 mainframes + 3 monitors, 1 dot matrix printer, 1 voice alarm

Cabinet Configuration

• System cabinet dimensions: 2200 × 800 × 600 mm
• Protection degree: IP42
• Equipped with temperature controller, heater, relay, buttons

Five-Prevention Interlock

• Prevents: load switch operation with switch in closed position
• Misclosure on grounds, opening under load, entering live compartment
• Ensures grounding when protection triggered

System Architecture

• Thyristor integrated power electronics module
• PLC + touch-screen control
• Chinese-language touch interface + dynamic graphical display

Five Core Capabilities (智能化)

• Intelligent detection
• Intelligent display
• Intelligent control
• Intelligent transmission
• Intelligent testing

Advantages

• Full digital control, modular structure, series combination
• Domestic leading technology level
• Powerful human-machine interaction
• Hard switch + simple structure, rich software functionality

Industry Applications

• Hydropower stations
• Thermal power plants
• Metallurgy, chemical, petroleum, mining industries
• Member: China Electrical Industry Association Power Generation Equipment Branch

Track Record

• Hundreds of excitation systems in industrial operation
• Longest service time exceeds 8 years
• Zero recorded incidents of lost magnetism, overvoltage, or失控 failure
• Sets new safety operation record for intelligent excitation systems

Module Families

• Z22005 / Z22010 (Self-cooling): 800W - 3kW, density 189 mW/cm³
• E22005 / E22010 (Forced-air): 800W - 3kW, density 360 mW/cm³
• E22020 (Forced-air, higher power): up to 6 kW, density 378 mW/cm³

Output Specifications

• 220V / 5A, 220V / 10A
• 110V / 10A, 110V / 20A
• 48V modules available (99-143 Vdc range)
• Adjustable output range: 198-286Vdc (220V modules)
• 43-63Vdc (48V modules)

Technical Performance

• Power factor: ≥0.95
• Efficiency: ≥92%
• Input voltage: 300-456 Vac three-phase
• Operating temperature: 0-45°C at full rated power

Protection Features

• Soft-switch technology (no buffer network needed)
• PFC circuit for input harmonic suppression (minimum EMI)
• 2-stage EMC circuit for grid compatibility
• Independent forced-air cooling (E series)
• Self-cooling (Z series) with over-temperature alarm + derating
• Hot-plug design for maintenance convenience
• Built-in battery charging curve management (S-type modules)

Monitoring & Control

• Built-in MCU for self-monitoring + management
• RS485 digital communication with central monitor
• 4-quadrant LED display
• Output current range: 10%-100% adjustable

System Configuration

• Z series: 3 modules per 19" rack
• E series: 3 modules per 19" rack (forced-air)
• N+1 redundancy configuration
• Automatic current equalization across paralleled modules

Certifications

• AL (Product Quality Inspection)
• MA (Mining Safety, applicable to mining applications)
• NO.L0685

Applications

• N+1 redundant DC power configuration
• DC backup power for substations
• Distributed power supply systems
• Power plant DC emergency power
• Industrial automation DC supplies

Core Capabilities

• Soft/hardware-combined measurement of voltage, frequency, phase, acceleration, slip rate
• Fuzzy-control variable-parameter voltage & frequency regulation
• Two voltage regulation modes: pulse-width (servo-motor analog) or count-based (digital)
• Frequency regulation supports hydraulic, DC servo, and AC motor speed governors

Operating Modes

• Auto Close: Fully automatic regulation + close command at predicted phase angle
• Manual Approval: Operator must hold external Approval button to permit close command
• No-Voltage Close: Permitted only when external grid confirmed de-energized

Multi-Setting Parameter Table

Parameter	Function	Range	Default
P00	Input voltage select (400V/100V)	U400/U100	U100
P01	Line/Generator mode	nnnn/FFFF	FFFF (Gen)
P02	Close mode	HEAU/HE--	HEAU (Auto)
P03	No-voltage close	HUYY/HunO	HunO (No)
P04	Voltage regulation mode	UPPP/UCCC	UPPP (PWM)
P05	Lead time	0.1 - 2.5 s	0.3 s
P06	Allowable voltage diff	2% - 10% (line: 2-18%)	4%
P07	Allowable frequency diff	±0.05 - ±0.6 Hz	0.3 Hz
P08	Allowable power-angle (line mode)	10° - 60°	30°
P09	PWM voltage pulse width	0.1 - 0.8 s	0.3 s
P10	Count-based voltage steps	2 - 10	4
P11	Speed pulse width	0.2 - 2.5 s	0.4 s
P12	Speed interval	3.0 - 25 s	10 s
P13	Close width	0.3 - 1 s	0.5 s
P14	Overvoltage set (% of rated)	110 - 130%	120%
P15-P16	Calibration (factory only)	-	-

Fault Detection (6 Types)

• Grid dropout (voltage/frequency = 0, 76s fault hold)
• Generator dropout (continuous fault hold)
• Grid frequency deviation > 3 Hz
• Generator frequency deviation > 5 Hz (except start-up)
• Grid voltage abnormality (over/under voltage, fault relay action)
• Generator overvoltage (fault relay action)

Physical Specifications

• Chassis: 75 × 150 × 260 mm (H × W × D)
• Cutout: 75 × 150 mm
• Front panel: 80 × 160 mm
• Working environment: -10°C to +50°C, altitude ≤2500m

Output Signals (6 Relay Contacts)

• Speed-up (power-angle match)
• Speed-down (same-frequency)
• Voltage-up (under-voltage)
• Voltage-down (over-voltage)
• Synchronous close
• Fault

Application Scenarios

• Unattended substations in remote areas
• Distributed generation nodes
• Micro-grid power stations
• Pumping stations, isolated industrial loads

Key Features

• 8-channel universal I/O (configurable DI/DO/AI)
• MODBUS RTU / TCP protocol support
• SMS alarm push to multiple recipients
• GPRS / 3G wireless uplink
• Local storage for offline data buffering

Technical Highlights

• Thyristor zero-cross switching (no contactor wear)
• Half-cycle response: <10 ms
• Zero inrush current on capacitor bank switching
• Suitable for dynamic loads (welding, elevators, rolling mills)

Typical Applications

• Hydropower station auxiliary loads
• Substation capacitor banks
• Industrial plants with fluctuating reactive demand

Six Protection Functions

• Overvoltage protection
• Undervoltage protection
• Overload protection (inverse-time)
• Short-circuit protection
• Overspeed protection
• Underspeed protection

Use Cases

• Standby diesel generator sets for hydropower stations
• Hybrid solar-diesel microgrid backup
• Remote area power supply