Zhejiang Hongyan Electric Co., Ltd. 
ENGINEERED SOLUTION
Steel & Metallurgy
Power factor correction, harmonic mitigation and voltage support for electric arc furnaces, rolling mills, cranes and high-load metallurgical production lines.
HYTBB Series Medium & High Voltage Reactive Power Compensation System – Outdoor Box Type
The HYTBB series outdoor medium & high voltage reactive power compensation system is designed for 220 kV and below distribution substations, providing reactive power automation and on-load voltage regulation for 6 kV / 10 kV busbars.
Outdoor MV Automatic Reactive Compensation & Voltage Regulation Device
Product Introduction
The HYTBB series outdoor medium & high voltage reactive power compensation system is designed for 220 kV and below distribution substations, providing reactive power automation and on-load voltage regulation for 6 kV / 10 kV busbars.
It integrates two key station control functions:
1️⃣ Automatic OLTC tap regulation
2️⃣ Automatic capacitor bank switching
2️⃣ Automatic capacitor bank switching
Through coordinated voltage and reactive power control, the system ensures:
- Improved power factor
- Reduced transformer and line losses
- Optimized bus voltage quality
- Increased utilization of electrical equipment
- Enhanced stability of substation operations
This outdoor cabinet-type structure enables rapid deployment in open substations and field environments with strong adaptability to weather, humidity, dust, and corrosion.
Key Advantages
✔ Outdoor fully-sealed cabinet design, IP-grade protection
✔ Integrates automatic reactive control + voltage regulation
✔ Supports detuned filtering for harmonic suppression
✔ Improves energy efficiency and reduces penalty charges
✔ Compatible with digital substations and smart grid systems
✔ Flexible configuration for various substation capacities
✔ Integrates automatic reactive control + voltage regulation
✔ Supports detuned filtering for harmonic suppression
✔ Improves energy efficiency and reduces penalty charges
✔ Compatible with digital substations and smart grid systems
✔ Flexible configuration for various substation capacities
Typical Applications
- 220 kV and below power distribution substations
- Industrial substations in remote or outdoor installations
- Renewable energy grid access points
- Municipal distribution networks
- Heavy industrial power supply systems
Control Capabilities
| Function | Description |
|---|---|
| Reactive power compensation | Multi-stage automatic capacitor switching |
| Voltage control | On-load tap changer coordination |
| Harmonic suppression | Optional detuned filtering reactors |
| Grid monitoring | Real-time voltage, current, PF, THD measurement |
| Intelligent operation | Remote monitoring / IEC communication protocols |
Why Outdoor Type?
| Indoor Type | Outdoor Type |
|---|---|
| Limited to well-conditioned rooms | Suitable for open substations & harsh environments |
| Requires civil construction | Compact and standalone structure |
| Higher installation cost | Reduced infrastructure investment |
Model Code Description
HYTBBZ-10-□/□-AKW/P6
| Code | Meaning |
|---|---|
| P | Reactor percentage (detuned filter) |
| H | Harmonic filter branch |
| W | Outdoor frame type |
| X | Outdoor / Indoor enclosure |
| K | Open-delta voltage protection |
| C | Phase voltage differential protection |
| L | Neutral-point unbalance current protection |
| A / B | Single star / Double star wiring |
| First □ | Single capacitor unit rating (kvar) |
| Second □ | Total capacitor bank rating (kvar) |
| System voltage | 6 / 10 kV |
| Type | Z = Automatic switching |
| Compensation type | L: Filtered compensation X: Fixed compensation T: Voltage regulating compensation W: Branch switching |
| Company code | — |
Operating Conditions
- Ambient temperature: −40°C to +45°C
(24-hour average ≤ +35°C) - Altitude: ≤ 2000 m, above 2000 m requires high-altitude design
- Humidity: daily ≤ 95%, monthly ≤ 90%
- Earthquake resistance: ≤ 8 degrees
- Installation tilt: ≤ 5°
- No corrosive or explosive gases; no conductive dust
- No heavy mold, condensation or steam corrosion
Functional Features
- Fully enclosed outdoor structure integrating switching & compensation
→ Reduces investment, footprint, installation & wiring cost - Designed for field conditions with:
✔ UV resistance ✔ Rain proof ✔ Salt-mist resistance
✔ Dust proof ✔ Excellent cooling ✔ High mechanical reliability - Configurable with filtering reactors for harmonic suppression
- Supports automatic coordination between:
- OLTC tap changer (voltage control)
- Capacitor banks (reactive power)
- Supports power factor control, voltage quality, and loss reduction
- Reliable protection functions:
- Over-voltage / under-voltage
- Over-current & differential current
- Neutral-point unbalance
- Fast fault disconnection without affecting other banks
Technical Specifications
| Item | Value |
|---|---|
| System rated voltage | 6–10 kV |
| Frequency | 50–60 Hz |
| Capacitor bank stages | Up to 5 groups, equal or unequal switching |
| Total capacity | 100–10000 kvar |
| Max single bank capacity | 2000 kvar |
| Control power | AC 220 V / DC 220 V |
| Sampling current | * / 5 A |
| Voltage sampling | 100 V |
| Protection level | Outdoor IP-rated — depends on design configuration |
Detuned Filter Configuration
- Reactor installed on feeder side
- Tuning ratio typical:
- 0.1%–1.0% for light harmonics
- 5%-6% for suppressing 5th & 7th harmonics
- 9%-13% for suppressing higher-level harmonic environments
Switching Device
- Special capacitor vacuum switches recommended
- Optional JCZ8 high voltage AC vacuum contactor for fast switching
Ordering Information
To ensure correct configuration, provide:
- System rated voltage & frequency
- Number of capacitor stages & capacity per stage
- Harmonic condition & compensation type
- Cable entry direction (top/bottom)
- Switchgear interface requirements
- Installation environment details
- Whether OLTC coordination function is required
For 10 kV > 200 kVAr single capacitor units → fuse-less protection is used
Cable entry and auxiliary interfaces must be specified
⭐Why Choose HYTBB Outdoor Type?
| Feature | Benefit |
|---|---|
| Outdoor fully-integrated cabinet | No equipment room required |
| Compact layout | Minimum civil engineering investment |
| Automatic coordination | Stable power factor + improved voltage |
| Harmonic suppression options | Better equipment protection |
| Smart grid compatible | SCADA/IEC communication support |
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