AC Control System
LQACS-2025: PLC-Controlled Digital System for High Voltage Withstand Testing
System Overview
The LQACS-2025 is a fully automated PLC-controlled measurement system designed for high-voltage withstand testing up to 1500kV. Utilizing fiber-optic isolation between control units and main equipment, it ensures operational safety per IEC 61010-1 standards. Key components include industrial-grade PLCs and a touch-screen HMI for programming and control.
Technical Specifications
| Parameter | Range | Accuracy |
|---|---|---|
| Voltage Withstand | 0-1500.0kV | ±0.1kV |
| Test Duration | 1S-9999S | ±1S |
System Architecture
Dual-Component Design
Control Interface - Touch-screen HMI in control room with fiber-optic data transmission
PLC Control Unit - Mounted in switch cabinet with 2-core optical fiber connectivity
Core Functions
Control Capabilities
Regulator primary/secondary switching
Programmable step-up/down with adjustable speed (3-phase AC motor)
Timed operations with auto-shutdown
Voltage/current protection value presets
Measurement Accuracy
Secondary voltage/current: ±1%
Divider voltage: ±1%
Discharge voltage recording
Safety & Interlocks
Critical Protections
Overvoltage/overcurrent trip systems
Test-field door interlocks
Emergency stop cascade shutdown
Regulator zero-position enforcement
State Monitoring
Phase sequence verification
Switch position indicators
Real-time protective device status
Operational Workflow
Set voltage/time parameters via touch screen
Initiate automated sequence with start button
System ramps up to target voltage (75% high-speed, 25% precision mode)
Automatic shutdown upon completion or fault detection
Post-test regulator return to zero position
Compliance Features
Dual-redundant protection circuits (independent of control system)
Auto-trip on control power failure
Test object breakdown detection with full system shutdown
NIST-traceable calibration protocols
