Product Overview
The FDGEC outdoor three-phase oil immersed discharge coil is a common-tank unit designed for AC power systems at 50Hz/60Hz. Connected with the high-voltage shunt capacitor bank, it provides a defined discharge path that reduces the residual voltage of the capacitors to a safe value within five seconds when the bank is disconnected from the system, protecting operating personnel and downstream equipment.
The three-phase core and winding assembly is installed in a sealed steel tank filled with mineral oil, with primary terminals brought out through three outdoor porcelain bushings. The primary winding is built in two sections of 13 kV each, matching the section voltage of the capacitor bank it serves. During normal operation, the 13/0.1 kV secondary winding (accuracy class 0.5, 50 VA output) functions as a voltage indicator and can also feed residual-voltage protection for the bank.
Key Features:
- Common-tank oil immersed structure with three porcelain bushings
- Double-section 13+13 kV primary windings for 35 kV shunt capacitor banks
- Discharges capacitor residual voltage to safe level in <5s at 5 Mvar duty
- Secondary winding 13/0.1 kV, class 0.5, 50 VA for voltage indication
- Rated insulation level 40.5/80/185 kV, ambient temperature -40°C to +40°C
- Conforms to GB50227-2017 and DLT653-2009 standards for 50/60Hz AC systems
Product Display
Model Designation
The FDGEC model designation follows a standardized coding system:
Example: FDGEC(13+13)-5-1W identifies an outdoor three-phase oil immersed discharge coil with double-section 13+13 kV primary windings, 5 Mvar discharge capacity, and outdoor installation design.
Service Conditions
- Installation: Outdoor type
- Number of Phases: Three phase, common tank
- Ambient Temperature: -40°C to +40°C
- System Frequency: 50Hz / 60Hz
- Insulation Medium: Mineral oil in sealed steel tank
- Atmosphere: No corrosive gas; no conducting or explosive dust
Construction
The FDGEC discharge coil features a gasketed steel tank shared by all three phases, making the assembly compact compared with three separate single-phase units. Oil serves both as the insulation medium and the cooling medium, giving the unit strong over-voltage capability and a stable thermal rating.
Construction Advantages: Three outdoor porcelain bushings for primary terminals, secondary terminal box on tank wall for safe connection of metering and protection circuits, earthing bolt on tank, drain valve, and lifting lugs on lid and tank, total weight approximately 260 kg.
Technical Data
| Type | Rated Voltage Ratio (kV) | Accuracy Class & Rated Output (VA) | Rated Insulation Level (kV) | Discharge Capacity (Mvar) |
|---|---|---|---|---|
| FDGEC(13+13)-5-1W | 13/0.1 | 0.5-50 | 40.5/80/185 | 5 / <5s |
Standards
The FDGEC series conforms to the GB50227-2017 and DLT653-2009 standards and can be built to special customer demands. The rated frequency is 50Hz/60Hz with a rated insulation level of 40.5/80/185 kV.
Installation & Dimensions
The FDGEC discharge coil stands on a flat foundation with the tank base level. Allow clearance around the tank for bushing creepage distances and for access to the secondary terminal box. The three primary bushings connect to the capacitor bank and the busbar or neutral point as per the approved circuit diagram; the tank is connected to the earthing grid through the earth bolt.
Installation Diagram
Wiring Diagram
The two-section primary windings are connected to the designated sections of the capacitor bank as shown in the wiring diagram. The 13/0.1 kV secondary winding supplies voltage indication and residual-voltage protection circuits. Confirm terminal markings, polarity and earthing against the approved wiring drawing before energization.
Key Outline Dimensions: Overall height 1215±10 mm (primary bushings included, three-phase V-arrangement), width over bushings 1075±10 mm with bushing pitch 605±10 mm, tank height 400 mm with base 750 mm front-to-back × 623 mm side-to-side, mounting hole pitch 670 × 500 mm (detail 450 mm, slot 25 × 13 mm), primary terminals high-voltage on each bushing, secondary terminals 4-M10 with cable fixing bracket, M10 earthing bolt, drain valve on tank wall, lifting lugs on lid and tank, weight approximately 260 kg.