Overview
The FDGE11 series is an outdoor, single-phase dry-type discharge coil for medium-voltage shunt capacitor banks. Connected in parallel with the capacitor bank, it provides a discharge path after switching to reduce residual voltage within the required discharge time.
The coil uses a fully sealed post-type structure with vacuum-cast epoxy resin insulation. Secondary windings can provide voltage indication, measurement, or residual-voltage signals for protection, with the final winding arrangement, accuracy class, and burden specified according to project requirements.
Key Ratings Snapshot
| Parameter | Specification |
|---|---|
| Product Series | FDGE11 |
| Product Type | High-voltage shunt capacitor discharge coil |
| Phase | Single-phase |
| Installation | Outdoor |
| Construction | Fully sealed dry type, post-type structure |
| Insulation | Vacuum-cast epoxy resin |
| Rated Primary Voltage Options | 6.6/√3, 7.2/√3, 11/√3, 12/√3 kV |
| Reference Secondary Voltage | 0.1 kV (100 V); other winding arrangements subject to specification |
| Accuracy / Rated Output Options | 0.2 / 20 VA; 0.5 / 50 VA; 1.0 / 100 VA |
| Matched Capacitor / Discharge Capacity | 1.7, 2.5 or 3.4 Mvar |
| Rated Insulation Level | 7.2/32/60 kV or 12/42/75 kV, depending on model |
| Rated Frequency | 50 Hz standard; 60 Hz configuration subject to technical confirmation |
Operating Function
A shunt capacitor bank retains electrical charge after it is disconnected from the network. The FDGE11 discharge coil is connected across the capacitor bank and provides a defined discharge path after switching. Unlike a conventional voltage transformer, its primary function is capacitor discharge, while secondary voltage output is used for measurement or protection when specified.
The referenced FDGE11 outdoor configuration specifies a discharge time of not more than 5 seconds. Final residual voltage, capacitor-bank capacity, connection arrangement, and discharge time should be confirmed according to the project requirements.
Construction and Design
The FDGE11 uses a fully sealed post-type structure with vacuum-cast epoxy resin insulation. The core and windings are encapsulated in resin to form a compact dry-type insulation system suitable for outdoor service, with resistance to moisture, electrical tracking, UV exposure and ageing. The sealed secondary terminal compartment helps reduce water ingress, while the oil-free design simplifies routine maintenance.
FDGE11 Model Designation
FDGE11 / [Rated Primary Voltage] – [Matched Capacitor Capacity] – 1W
| Code | Meaning |
|---|---|
| FD | Discharge coil |
| G | Dry type |
| E | With secondary winding |
| 11 | Design series number |
| First value after “/” | Rated primary voltage, kV |
| Second value | Maximum matched capacitor-bank capacity, Mvar |
| 1 | Single-phase |
| W | Outdoor installation |
Example: FDGE11/11/√3-2.5-1W identifies an outdoor single-phase dry-type discharge coil with secondary winding, an 11/√3 kV rated primary voltage configuration and a 2.5 Mvar matched capacitor capacity.
Technical Parameters
Service Conditions
- Outdoor installation
- Rated frequency: 50 Hz / 60 Hz
- Ambient temperature: -40°C to +40°C
- Altitude: ≤ 3000 m
- No corrosive gas, vapor, conductive dust, or explosive dust
- No severe mechanical vibration
Model and Electrical Data
- Reference creepage distance: > 420 mm
- Secondary load power factor: cos φ = 0.8 lagging
| Model | Rated
Voltage Ratio |
Accuracy Class /
Rated Output |
Matched
Capacitor / Discharge Capacity |
Rated I
nsulation Level |
|---|---|---|---|---|
| FDGE11/6.6/√3-1.7-1W | 6.6/√3 kV / 0.1 kV | 0.2 / 20 VA 0.5 / 50 VA 1.0 / 100 VA |
1.7 Mvar | 7.2/32/60 kV |
| FDGE11/7.2/√3-1.7-1W | 7.2/√3 kV / 0.1 kV | 1.7 Mvar | ||
| FDGE11/11/√3-1.7-1W | 11/√3 kV / 0.1 kV | 1.7 Mvar | 12/42/75 kV | |
| FDGE11/11/√3-2.5-1W | 11/√3 kV / 0.1 kV | 2.5 Mvar | ||
| FDGE11/11/√3-3.4-1W | 11/√3 kV / 0.1 kV | 3.4 Mvar | ||
| FDGE11/12/√3-1.7-1W | 12/√3 kV / 0.1 kV | 1.7 Mvar | 12/42/75 kV | |
| FDGE11/12/√3-2.5-1W | 12/√3 kV / 0.1 kV | 2.5 Mvar | ||
| FDGE11/12/√3-3.4-1W | 12/√3 kV / 0.1 kV | 3.4 Mvar |
Technical note: Alternative secondary winding arrangements for measurement or residual-voltage protection are available according to project requirements. Final ratings and winding configuration shall follow the approved technical specification and factory drawing.
Standards
The FDGE11 series is designed for high-voltage shunt capacitor applications. Current Chinese industry standard DL/T 653-2023 covers discharge coils for high-voltage shunt capacitor installations and replaces DL/T 653-2009. Final standard and test requirements shall be confirmed according to the project specification.
Installation & Wiring
Installation & Wiring
Installation Diagram
Outline and mounting drawing showing overall dimensions, mounting positions, high-voltage terminals, secondary terminal box, and grounding point.
Wiring Diagram
The high-voltage winding is connected in parallel with the shunt capacitor bank. Secondary terminals are connected according to the specified measurement or protection circuit shown in the wiring diagram.
Applications
- Outdoor high-voltage shunt capacitor banks
- Substation reactive-power compensation systems
- Medium-voltage capacitor installations in utility distribution networks
- Industrial power-factor correction and reactive-power compensation systems
- Capacitor-bank assemblies requiring residual-voltage discharge after switching
- Projects requiring secondary voltage indication, measurement or protection signals from the discharge coil
Selection & FAQs
Model Guide
To determine the appropriate FDGE11 model, provide the following project information:
- System voltage and capacitor-bank rated voltage
- Capacitor-bank capacity and connection arrangement
- Required discharge time and residual-voltage requirement
- Secondary voltage, accuracy class, and rated output
- Rated frequency and insulation level
- Site altitude, ambient temperature, and applicable standard
Frequently Asked Questions
Q1. Which FDGE11 model is suitable for my capacitor bank?
The appropriate model is determined by the rated primary voltage, capacitor-bank capacity, connection arrangement, discharge requirements, secondary winding configuration, and insulation level. Available FDGE11 ratings include 6.6/√3, 7.2/√3, 11/√3, and 12/√3 kV.
Q2. What information is needed for quotation and technical confirmation?
Please provide the capacitor-bank voltage and capacity, connection arrangement, rated frequency, required discharge time, secondary voltage and output, site altitude, ambient temperature, quantity, and applicable project standard.
Q3. Can the FDGE11 provide secondary voltage output?
Yes. The secondary winding can provide voltage indication or measurement according to the specified configuration. Series data includes 0.2 / 20 VA, 0.5 / 50 VA, and 1.0 / 100 VA options.
Q4. Is the FDGE11 suitable for both 50 Hz and 60 Hz applications?
Yes. The referenced FDGE11 outdoor configuration is available for 50 Hz and 60 Hz applications. The required frequency should be stated with the project data.
Q5. Can the FDGE11 operate in high-altitude and low-temperature environments?
The referenced outdoor configuration is suitable for ambient temperatures from -40°C to +40°C and installation altitudes up to 3000 m.
Q6. What technical details should be confirmed before production?
Confirm the model, voltage ratio, capacitor-bank capacity, secondary winding configuration, accuracy class, rated output, insulation level, installation dimensions, and wiring arrangement against the approved technical specification and drawings.