Product Introduction
I. Product Overview and Core Functions
The GGD-type Capacitor Compensation Cabinet is a low-voltage reactive power compensation device compliant with IEC 60439 and GB 7251 standards, designed to improve grid power factor and reduce line losses. It addresses low power factor issues (typically ≤0.8) caused by inductive loads (e.g., motors, transformers) by providing capacitive reactive power through parallel-connected capacitor banks, achieving:
Energy Efficiency: Reduces reactive current transmission, cutting line losses by over 30%.
Enhanced Equipment Utilization: Increases active power output by 30% under the same transformer capacity by raising the power factor from 0.7 to 0.95.
Stable Voltage Quality: Suppresses voltage fluctuations and improves end-point voltage deviation.
Enhanced Equipment Utilization: Increases active power output by 30% under the same transformer capacity by raising the power factor from 0.7 to 0.95.
Stable Voltage Quality: Suppresses voltage fluctuations and improves end-point voltage deviation.
Typical Applications:
380V distribution systems in power plants, industrial facilities, and commercial buildings, compatible with transformers ≤2000kVA.
II. Structural Design Features
1. Cabinet and Framework
Fully Modular Structure: Assembled with 8MF cold-formed steel frames and 20-modulus mounting holes (E=20mm) for flexible expansion.
Three-Zone Isolation Design:
Capacitor Compartment: Independent cooling duct (bottom air intake/top exhaust), temperature rise ≤25°C.
Control Compartment: Houses intelligent controllers and protective components.
Busbar Compartment: Copper busbars with tin-plated surfaces to minimize contact resistance.
Protection Rating: Standard IP30, optional IP40 (dust-resistant) or IP65 (outdoor waterproof).
2. Core Component Innovations
1. Cabinet and Framework
Fully Modular Structure: Assembled with 8MF cold-formed steel frames and 20-modulus mounting holes (E=20mm) for flexible expansion.
Three-Zone Isolation Design:
Capacitor Compartment: Independent cooling duct (bottom air intake/top exhaust), temperature rise ≤25°C.
Control Compartment: Houses intelligent controllers and protective components.
Busbar Compartment: Copper busbars with tin-plated surfaces to minimize contact resistance.
Protection Rating: Standard IP30, optional IP40 (dust-resistant) or IP65 (outdoor waterproof).
2. Core Component Innovations
Component Technical Solution Advantages
Switching Device Intelligent hybrid switch (electromechanical integration) Zero inrush current (≤1.2× rated current), no contact burnout.
Capacitors Self-healing dry-type capacitors (Δ/Y wiring) Loss tangent (tgδ) ≤0.1%, lifespan ≥100,000 hours.
Reactors Air-core reactors (4.5%~12% reactance rate) Suppresses 5th/7th harmonics, THDi ≤5%.
Controller Reactive power-based (non-power factor type) Demand-driven compensation ("compensate what is lacking"), response time ≤20ms.
Switching Device Intelligent hybrid switch (electromechanical integration) Zero inrush current (≤1.2× rated current), no contact burnout.
Capacitors Self-healing dry-type capacitors (Δ/Y wiring) Loss tangent (tgδ) ≤0.1%, lifespan ≥100,000 hours.
Reactors Air-core reactors (4.5%~12% reactance rate) Suppresses 5th/7th harmonics, THDi ≤5%.
Controller Reactive power-based (non-power factor type) Demand-driven compensation ("compensate what is lacking"), response time ≤20ms.
III. Key Technical Specifications
Parameter Specification Standard/Note
Rated Voltage AC 380V (max. 690V) IEC 60439
Rated Current 100A–3150A (GGD1/GGD2/GGD3 tiers) GGD3 supports 3150A
Compensation Capacity ≤480kvar per cabinet (multi-cabinet paralleling) Single capacitor group ≤40kvar
Short-Circuit Withstand 15kA–50kA (tiered design) GGD3 achieves 50kA/1s
Protection Rating IP30 (standard), IP65 (optional) Outdoor models use stainless steel cabinets
Discharge Time ≤3s (residual voltage ≤50V) Built-in rapid discharge device
Rated Voltage AC 380V (max. 690V) IEC 60439
Rated Current 100A–3150A (GGD1/GGD2/GGD3 tiers) GGD3 supports 3150A
Compensation Capacity ≤480kvar per cabinet (multi-cabinet paralleling) Single capacitor group ≤40kvar
Short-Circuit Withstand 15kA–50kA (tiered design) GGD3 achieves 50kA/1s
Protection Rating IP30 (standard), IP65 (optional) Outdoor models use stainless steel cabinets
Discharge Time ≤3s (residual voltage ≤50V) Built-in rapid discharge device
IV. Core Technologies and Performance Advantages
1. Compensation Mode Innovations
Centralized Monitoring + Distributed Control:
Monitors grid parameters at the transformer end while deploying capacitors at 2/3 of branch circuits for precise local compensation via power line carrier (PLC) communication, improving efficiency by 25% over centralized methods.
Hybrid Compensation Strategy:
Phase-by-Phase Compensation: Addresses three-phase imbalance (single-phase switching accuracy ±1kvar).
Equal/Coded Switching: Supports proportional or binary capacity combinations for adaptive load fluctuations.
2. Intelligent Management
Holistic Monitoring: Real-time display of voltage, current, power factor, and harmonic distortion (THD).
Fault Recording: Logs overvoltage, undervoltage, and harmonic exceedance events with USB data export.
Communication Interface: Standard RS485 with Modbus-RTU protocol for SCADA integration.
3. Multi-Layer Protection Mechanisms
1. Compensation Mode Innovations
Centralized Monitoring + Distributed Control:
Monitors grid parameters at the transformer end while deploying capacitors at 2/3 of branch circuits for precise local compensation via power line carrier (PLC) communication, improving efficiency by 25% over centralized methods.
Hybrid Compensation Strategy:
Phase-by-Phase Compensation: Addresses three-phase imbalance (single-phase switching accuracy ±1kvar).
Equal/Coded Switching: Supports proportional or binary capacity combinations for adaptive load fluctuations.
2. Intelligent Management
Holistic Monitoring: Real-time display of voltage, current, power factor, and harmonic distortion (THD).
Fault Recording: Logs overvoltage, undervoltage, and harmonic exceedance events with USB data export.
Communication Interface: Standard RS485 with Modbus-RTU protocol for SCADA integration.
3. Multi-Layer Protection Mechanisms
Protection Type Trigger Threshold Response Time
Overvoltage ≥470V ±10% ≤1s
Undervoltage ≤270V ±10% ≤5s
Harmonic Overload THDi > 8% ≤2s
Capacitor Overheating >85°C (built-in temperature sensor) Immediate action
Overvoltage ≥470V ±10% ≤1s
Undervoltage ≤270V ±10% ≤5s
Harmonic Overload THDi > 8% ≤2s
Capacitor Overheating >85°C (built-in temperature sensor) Immediate action
V. Typical Applications and Selection Guidelines
1. Scenario-Based Solutions
1. Scenario-Based Solutions
Load Type Compensation Strategy Cabinet Configuration
Motor clusters (factories) Centralized + local hybrid compensation GGD2 + distributed capacitor boxes
Commercial lighting (malls) Phase-by-phase compensation (high single-phase LED ratio) GGD1 + high-precision controller
VFD-driven loads (steel mills) 12% reactance filtering compensation GGD3 + reinforced reactors
Motor clusters (factories) Centralized + local hybrid compensation GGD2 + distributed capacitor boxes
Commercial lighting (malls) Phase-by-phase compensation (high single-phase LED ratio) GGD1 + high-precision controller
VFD-driven loads (steel mills) 12% reactance filtering compensation GGD3 + reinforced reactors
2. Selection Golden Rules
Capacity Calculation:
Qc = P × (tanφ₁ - tanφ₂)
(P: Active power; φ₁/φ₂: Power factor angles pre/post compensation).
Short-Circuit Capacity: Select GGD3 for systems with expected short-circuit currents >25kA.
Harmonic Environment:
Dominant 5th harmonic → 4.5%~6% reactors.
Significant 3rd harmonic → 12% reactors or additional filters.
Capacity Calculation:
Qc = P × (tanφ₁ - tanφ₂)
(P: Active power; φ₁/φ₂: Power factor angles pre/post compensation).
Short-Circuit Capacity: Select GGD3 for systems with expected short-circuit currents >25kA.
Harmonic Environment:
Dominant 5th harmonic → 4.5%~6% reactors.
Significant 3rd harmonic → 12% reactors or additional filters.
VI. Installation and Maintenance Essentials
1. Installation Standards
Cabinet vertical tilt ≤5°, foundation bolts ≥M12.
Apply conductive paste to busbar joints; torque values calibrated per IEC 61439.
2. Maintenance Cycles
Monthly: Dust removal (compressed air blowout).
Annual: Capacitance testing (replace if decay >10%).
3. Emergency Troubleshooting
Frequent tripping: Check harmonic levels and reactor compatibility.
Capacitor bulging: Immediate shutdown; inspect ventilation and overvoltage logs.
Summary: Core Value of GGD Capacitor Compensation Cabinets
The GGD series resolves traditional compensation cabinet pain points—slow response, high inrush current, and over/under-compensation—through three innovations: distributed control compensation, intelligent hybrid switches, and hybrid switching strategies. Its value proposition includes:
Economics: ROI within 1 year (electricity savings + power factor penalty rebates).
Reliability: 50kA short-circuit withstand + 100,000 switching cycles lifespan.
Intelligence: Upgrades from "reactive compensation" to predictive governance.
Reliability: 50kA short-circuit withstand + 100,000 switching cycles lifespan.
Intelligence: Upgrades from "reactive compensation" to predictive governance.
Engineer Selection Tip: Prioritize models supporting power line carrier (PLC) distributed compensation (e.g., GGD-0.4/W) and enforce adjustable reactance rate configurations in high-harmonic environments.