Shaanxi Longxiang Electrical Co., Ltd. is one of the most reliable manufacturers and suppliers of 24kv embedded pole for vacuum circuit breaker in China. With abundant experience, we are committed to providing high quality customized products with competitive price. Welcome to buy premium 24kv embedded pole for vacuum circuit breaker made in China here from our factory.
Products Description
Epoxy resin embedded pole (also known as encapsulated vacuum interrupter) is constructed by wrapping the vacuum interrupter with a buffer material first, followed by an outer layer of epoxy resin. It replaces the insulating and mechanical supports originally used on circuit breakers, greatly reducing the number of components and overall size of the breaker. Featuring integrated modular design, it delivers easy installation, maintenance-free operation, compact footprint, as well as more stable and reliable voltage withstand performance. It features excellent vacuum tightness, reliable insulation, good resistance to thermal shock and mechanical shock, maintenance-free operation, compact size and easy installation.
Product Advantages:
- Excellent vacuum tightness
- Reliable insulation
- Good resistance to thermal shock and mechanical shock
- Maintenance-free operation
- Compact size and easy installation.
Technical Specification of Embedded Pole
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Voltage ratings at rated contact stroke |
||
|
Rated Voltage |
24 |
kV |
|
Rated Frequency |
50/60 |
Hz |
|
Short-time (1 min) power-frequency withstand voltage |
65 |
kV |
|
Lightning impulse withstand voltage (Peak) |
65 |
kV |
|
Current ratings |
||
|
Rated Current |
1250/1600 |
A |
|
Rated short-circuit breaking current |
31.5 |
kA |
|
Percentage D.C component of rated S.C Breaking Current |
40 |
% |
|
Breaking operations of rated short circuit breaking current |
30 Or comply with E2 class GB/T1984 and IEC 62271-100 |
Times |
|
Rated short-time withstand Current |
31.5 |
kA |
|
Rated duration of short-circuit |
4 |
s |
|
Rated peak withstand current |
80 |
kA |
|
Rated short-circuit making Current |
80 |
kA |
|
★Rated breaking current of single capacitor bank |
400/630 |
A |
|
★Rated breaking current of back-to-back capacitor bank |
400 |
A |
|
Circuit resistance at lowest rated contact force |
≤20 |
μΩ |
|
Rated operating sequence |
0-0.3s-co-180s-co |
|
|
Local discharge limit value |
≤5 |
pC |
|
Mechanical Data |
||
|
Closing force due to bellow and atmosphere |
120±60 |
N |
|
Force required to hold contacts open at full stroke |
230±80 |
N |
|
Rated added external contact final force |
3400±200 |
N |
|
Added external contact force at contact touch point |
2400±170 |
N |
|
Mechanical requirements |
||
|
Clearance between open contacts |
13±1 |
mm |
|
Average opening speed |
1.3±0.3 |
m/s |
|
Average closing speed |
0.8±0.2 |
m/s |
|
Contact bouncing duration at closing operation |
≤2.0 |
ms |
|
Closing and Opening non-simultaneity of three-phase Contacts |
≤2.0 |
ms |
|
Maximum Rebound during opening |
≤1.5 |
ms |
|
Overtravel |
4±0.5 |
mm |
|
Life |
||
|
Storage life |
20 |
Years |
|
Mechanical endurance |
10,000 |
Times |
|
Contact erosion limit |
3 |
mm |
|
Note： ★2.Rated characteristics to be given on request. 3.In order not to damage the metal bellows, the movable stem should be prevent from rotation when assembling.
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Common Problems of Low-cost Embedded Poles
1.Low-cost poles: Poor APG process control leads to internal voids and subsequent partial discharge surge during operation.
2.Low-grade epoxy resin: Prone to cracking, moisture absorption and surface leakage current.
3.Simplified shielding design: High risk of flashover at high altitudes or polluted environments.
4.Weak conductive circuit: Deformation under short-circuit impact and excessive temperature rise.
faq
Q:1.Is the embedded pole maintenance-free?
A:The epoxy encapsulated body is maintenance-free. However, the matched operating mechanism, connecting bolts and circuit resistance shall be inspected periodically per regulations.
Q:2.How to select an embedded pole?
A:Select based on rated voltage, rated current, rated short-circuit breaking current, compatible circuit breaker type nstallation dimension and ambient conditions.
Q:3.Can I replace only the vacuum interrupter inside the embedded pole?
A:No.The APG monolithic encapsulation forms an integrated structure. Disassembly will damage insulation and vacuum tightness. Replace the whole pole if failed.
Q:4.What does allowable contact wear thickness mean?
A:It is the maximum permissible erosion thickness of contacts caused by arcing. Once exceeded, contact gap and overtravel will go out of tolerance, breaking performance deteriorates, and pole replacement is required.
Q:5.What's your best lead time for orders?
A:It depends on the quantity and customization requirements. Please feel free to contact us for more information.
Q:6.Do you inspect the finished products?
A:Yes, all products will be inspected strictly to ensure full compliance with ISO 9001 standards as well as relevant industry standards such as IEC. Also we will provide goods inspection reports for your reference before shipment.
