Discharge Coil Dry-Type
First. The purpose and scope:
Ensuring optimal safety and performance, the discharge coil dry-type by LUOKE is crucial when the substation's shunt capacitor group is disengaged. This innovative device is engineered to swiftly eliminate internal charges, enabling seamless automatic control switching of capacitor banks. Unlike conventional internal discharge resistors that often fall short in performance and reliability, our dedicated discharge coil stands out. It delivers unparalleled technical security, crucial for maintaining safe voltage levels and ensuring the smooth operation of parallel capacitor substations.
For paramount operational safety and reliability, it is recommended to use a single-star connected capacitor bank. This method allows each phase capacitor bank to be directly paralleled with its corresponding discharge coil. The secondary winding connects in an open delta configuration with protection relays, safeguarding against unbalanced voltage incidents. Should any phase suffer component damage, the unbalanced voltage protection swiftly detects the issue and disconnects the capacitor, ensuring reliable protection performance. Our discharge coil is engineered to provide precision and high reliability, preventing disruptions and maintaining optimal functionality.
In large capacitor assemblies, where capacitors operate in parallel, internal fuses manage faults. Any capacity imbalance can lead to electrical faults or undue stress on specific phases. LUOKE's discharge coils, equipped with intermediate taps, measure tap voltages accurately across connected phases. Utilizing two independent secondary windings in a differential setup, they work in harmony with protection relays for differential protection. This ensures safety switches act promptly to protect capacitors from grid instability. For extensive capacitor banks requiring segmented high-capacity connections, our high-voltage FDGRC discharge coils guarantee high sensitivity and accuracy, offering unmatched fault protection.
Our 10~35kV dry discharge coils are expertly crafted to meet rigorous standards and are perfect for non-oil installation sites, delivering impeccable performance and compliance.
Forth. The structural features
1. Employing an epoxy resin vacuum casting structure, the product is oil-free, effectively eliminating flammable oil leakages and related drawbacks;
2. With its straightforward design and excellent integrity, the product is incredibly easy to install and operate;
3. The product is exceptionally sturdy and reliable, with high mechanical strength; 4. Utilizing advanced epoxy resin vacuum casting techniques, the product's internal and external insulation strength is significantly enhanced, boosting its safety and reliability;
5. Requiring minimal maintenance, the product only needs a simple surface cleaning during maintenance outages to keep the discharge coil in prime condition;
6. The product boasts cutting-edge technology and superior performance, fully aligning with JBT8970-1999 and DL/T653-2009 standards;
7. Compliant with non-oil domestic power transmission site management mandates, the product offers remarkable environmental benefits.
Fifth. Environmental Conditions
1. Installation Location: Indoors, where the environment fosters optimal performance and longevity. 2. Ambient Temperature: Suitable for a wide operational range of -40~+55°C, ensuring adaptability to various climatic conditions. 3. Altitude: Engineered to excel at heights not exceeding 2000 meters, delivering reliable service in diverse topographies. 4. Seismic Levels: Installation sites should be free from severe mechanical shocks to maintain stability and safety. 5. Installation Site: Must be devoid of harmful gases, vapors, and non-conductive or explosive dust, ensuring a risk-free environment. 6. Relative Humidity: Monthly average humidity should remain below 90%, with daily peaks not surpassing 95%, to safeguard against moisture-related issues.
| Sixth.The main technical parameters |
| System nominal voltage |
10kV |
20kV |
35kV |
| Rated primary voltage |
11,11.5,12,12.5,
13,11/ √3,12 √3,
11/2 √3+11/2 √3,
12/2 √3+12/2 √3 |
21,23,22/ √3,
24/ √3,
11/ √3+11/ √3,
12 √3+12/ √3 |
38.5/ √3,40/ √3,
42/√3,43.3/ √3,
45/√3,11+11, 11.5+11.5, 12+12, 12.5+12.5, 13+13 |
| Rated secondary voltage |
100V,100V+100V,100V+100/ √3V,100/3V+100/ √3V |
| Single-phase matching capacitor capacity |
0.5~24Mvar |
| Phase /rated frequency |
Singular/50Hz |
| Rated output/accuracy class |
50VA/0.5 Class,100VA/1 Class |
| Wiring |
Less polar |
| Partia discharae |
≤20pC |
| Discharge performance |
When the capacitor bank power 5s,its terminal
voltage drops between 50V and below the √2U1N. |
| Insulation Level |
Rated frequency withstand
voltage(rms) |
35/42 |
55/65 |
80/95 |
Rated lightning impulse withstand
voltage(rms) |
75 |
125 |
185 |
| Withstand voltage between turns |
3 times the rated frequency,
2.5 times the rated voltage, which lasted 60s |
Seventh.
Installation and Transport Considerations
1. Connection: Use flexible cables for the high-voltage terminal of the capacitor bank. If employing aluminum connections, ensure the section does not exceed 30 x 4mm. Proper measures should be implemented to secure the terminal head at telescopic sites. 2. Grounding: Both the discharge coil core and exposed feet must be meticulously grounded to guarantee safety. 3. Grounding Mount: Secure the discharge coil mounting foot with proper grounding, particularly in northern cold regions, to prevent issues such as high-side short circuits during routine winter maintenance or snow clearing. 4. Transport Stability: During transport, the product must remain balanced and never be placed upside down to avoid damage. 5. Handling: Exercise caution when handling, ensuring the product is not subjected to hard impacts or scratches. 6. Polarity: Strictly prohibit any secondary reverse polarity, secondary circuit short circuits, and multi-point grounding, as these can lead to operational failures. 7. Installation Orientation: When side-mounted, ensure the secondary wiring is not covered, as this is strictly prohibited to maintain electrical integrity. 8. Water Protection: For side-mounted products, ensure secondary wiring leads are positioned downward to prevent water ingress, which could lead to secondary wiring short circuits.
Dry type
Oil type
FAQ
1. Question : Why choose us and trust us?
Answer : Good product, good price, and good service.
Company spirit: Practical innovation, sincerity to all
Core values: Customers' praise is the only value we exist.
Management concept: Pursuing excellent quality, creating first-rate services
2. Question : Where is your factory located ? How can I visit there ?
Answer: With an ISO90001 certified factory located in Yueqing city, Zhejiang Province, P.R.OF China.
It takes about 4 hours from SHANGHAI by high-speed rail and 45 minute by air.
It is very pleasure for all to visit us.
3. Question : Can you do OEM ?
Answer: Yes, we have the ability to do OEM /ODM to meet your requirements.
4. Question : What is the payment terms?
Answer: In general T/T, L/C, Paypal or others we can discuss.
5. Question :How about the delivery time?
Answer: Usually, if have enough in warehouse, the delivery time is within 3 working days.
If need produce, the lead time is about 10-20 working days according to quantity of the order.
6. Question : How about the shipping method?
Answer: For sample or small order, deliver by International express, such as DHL, FEDEX, TNT, UPS, EMS and so on.
For large order, deliver by sea or by air according to buyers shipping instructions.
How to contact us
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