Discharge Coil Dry-Type
First. The purpose and scope:
When installed in a substation's shunt capacitor group, the indispensable Discharge Coil Dry-Type is crucial for releasing any residual charge safely. This specialized discharge device ensures that automatic control switching of capacitor banks is performed efficiently within the designated time frame, achieving a secure voltage level. Unlike current installations with internal discharge resistors that exhibit quality issues and performance shortcomings, our dedicated discharge coil provides the necessary technical security measures in parallel capacitor substations.
For ensuring the operational safety and reliability of shunt capacitors, we recommend using a single star connection capacitor bank. This configuration, now extensively adopted, involves directly paralleling each phase of the capacitor bank with its discharge coil. The secondary winding is open delta connected with protection relays to form an unbalanced voltage protection circuit, safeguarding the capacitor bank internally. In the event of a phase-specific component failure, the unbalance voltage protection mechanism promptly disconnects the faulty capacitor from the grid, aided by the high efficacy of the discharge coil to maintain optimal protection performance.
The integration of large capacitor collections or single capacitors primarily entails fault resolution through the original internal fuse. To maintain capacitor operation continuity, discharge coils equipped with intermediate taps assess point voltages across each phase. Their dual independent secondary windings, connected in differential mode with relays, form a robust differential protection system. This ensures the capacitor exits the grid safely when the voltage exceeds permissible levels. In cases of large-capacity, series-connected capacitors, or single large volume capacitors, high-sensitivity differential protection is employed to address potential internal faults effectively. The FDGRC discharge coil's differential pressure measurement assures precision in sensitive fault detection, with high-voltage coils featuring a center tap A2, making them ideal for shunt capacitor integration.
The 10~35kV dry discharge coil is expertly designed to meet stringent requirements and is perfectly suited for installations that demand oil-free environments.
Forth. The structural features
1. Utilizing an advanced epoxy resin vacuum casting structure, the product is oil-free, successfully eliminating flammable oil leaks and other inherent issues.
2. The product boasts a straightforward structure, excellent integrity, and unparalleled ease of installation and use.
3. With remarkable robustness, reliability, and high mechanical strength, the product stands out. Its epoxy resin vacuum casting process significantly bolsters both internal and external insulation strength, dramatically elevating safety and reliability.
5. Minimal maintenance is required, with outages for maintenance involving simple surface cleaning of the discharge coil.
6. Technologically advanced with superior performance, the product fully complies with JBT8970-1999 and DL/T653-2009 standards.
7. Meeting domestic non-oil power transmission site management standards, the product boasts substantial environmental benefits.
Fifth. Environmental Conditions
1. Optimal Installation Location: Indoor 2. Ambient Temperature Range: A robust -40°C to a warm +55°C 3. Altitude: Ensure heights do not exceed 2000 meters for optimal operation. 4. Seismic Stability: The installation site must be free from severe mechanical shocks. 5. Site Safety: No harmful gases, vapors, or explosive non-conductive dust should be present. 6. Relative Humidity: Monthly average should remain below 90%, with daily averages under 95%.
| 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. For connecting with the high-voltage terminal of the capacitor bank, ensure flexible cable usage. If using aluminum, the connection should not exceed a section of 30 x 4mm. Implement measures to secure terminal heads at telescopic sites. 2. Grounding is essential: both the discharge coil core and exposed feet must be securely grounded. 3. The discharge coil mounting foot requires grounding, especially in cold northern seasons. Ensure routine maintenance and use snow sweeper bodies to avert high-side short circuits. 4. During transportation, balance is key. The machine must never be placed upside down. 5. Handle with care: avoid contact with hard objects or potential scratches. 6. Strictly prohibited practices: reverse polarity in secondary circuits, short circuiting, and multi-point grounding are forbidden. 7. When side-mounting the product, covering the secondary wiring is strictly prohibited. 8. For optimal safety, ensure the product is side-mounted with secondary wiring leads downward to prevent water ingress that might short the wiring.
Innovative Dry-Type Design
Traditional Oil-Type Design
Frequently Asked Questions
1. Question: Why should you choose us and trust our expertise?
Answer: We offer superior products, competitive pricing, and exceptional customer service.
Our Company Spirit: Commitment to practical innovation and genuine sincerity to everyone
Core Values: Your satisfaction is the cornerstone of our existence.
Management Concept: Striving for outstanding quality while delivering top-tier services
2. Question: Where is your factory located? How can I visit there?
Answer: Our ISO90001 certified facility is situated in Yueqing City, Zhejiang Province, People's RepublicOF China.
Reach us in about 4 hours from SHANGHAI by high-speed rail or just 45 minutes by air.
We warmly welcome everyone to visit our facility.
3. Question: Is OEM possible?
Answer: Absolutely, we provide OEM/ODM services tailored to your specific needs.
4. Question: What are your payment terms?
Answer: We generally accept T/T, L/C, Paypal, and are open to discussing other options.
5. Question:What is the estimated delivery time?
Answer: If in stock, we deliver within 3 working days.
For production, expect a lead time of 10-20 working days, depending on order volume.
6. Question: What are your shipping methods?
Answer: Samples or small orders are shipped via express services like DHL, FEDEX, TNT, UPS, and EMS.
Large orders ship by sea or air, as per your instructions.
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