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■ Product features
· Non-gas,unfilled oil
· Fire proof,explosion proof
· Maintenance-free
· Ambient air temperature form -40 ℃ to +55℃
· High mechanical performance
· Stable electrical performance
· Anti-pollution
■ Technical parameters
· Highest voltage：12~252(245)kV
· Rated current：100~5000A
· Rated frequency：50Hz、60Hz
■ Environment condition
· Installation angle：any angle will do
· Ambient air temperature：-40~+55℃
· Altitude：1000m（confering with consumer if above 1000m）
· Pollution class： Ⅱ、Ⅲ、Ⅳ
■ Main performance
· The main performance of then product can satisfy the requests of GB/T4109 《Insulated bushing for alternating voltages above 1000V》and IEC 60137《Insulated bushing for alternating voltages above 1000V》.
· Rated insulation level and partial discharge level
| Highest voltage Um(kV) | Rated insulation level | Partial discharge level | ||
| Power frequency withstand voltage (kV) | Lightning impulse withstand voltage (kV) | Partial discharge test voltage (kV) | Partial discharge(pC) | |
| 12 | 30 | 75 | 10 | 10 |
| 24 | 55 | 125 | 21 | 10 |
| 40.5 | 95 | 200 | 35 | 10 |
| 52 | 105 | 250 | 45 | 10 |
| 72.5 | 155 | 325 | 63 | 10 |
| 126（123） | 255 | 550 | 109 | 10 |
| 145 | 255 | 650 | 126 | 10 |
| 252（245） | 505 | 1050 | 160 | 10 |
· Dielectric loss factor
Dielectric loss factor is not greater than 0.005 under 10kV and 1.05Um/√3kV(ambient air temperature 10~40℃).
· Temperature rising limit
The highest temperature rising of winding is not greater than 75K.
· Rated short-time thermal current is twenty-five times rated current when time keeps up 1 second.
· Minimum values of cantilever withstand load
Highest voltage | Rated current （A） | |||
≤800 | 1000~1600 | 2000~2500 | ≥3150 | |
12 | 1000 | 1250 | 2000 | 3150 |
24 | 1000 | 1250 | 2000 | 3150 |
40.5 | 1000 | 1250 | 2000 | 3150 |
52 | 1000 | 1250 | 2000 | 3150 |
72.5 | 1000 | 1250 | 2000 | 4000 |
126(123) | 1250 | 1600 | 2500 | 4000 |
145 | 1250 | 1600 | 2500 | 4000 |
252(245) | 1250 | 1600 | 2500 | 4000 |
■ Acceptance and maintenance
Every transformer bushing has passed the tests including power frequency withstand voltage,thunder impulse with stand voltage,partial discharge,dielectric loss factor,leakage test,terminal withstand voltage before leaving the factory. We follow up GB/T4109 《Insulated bushing for alternating voltages above 1000V》and IEC 60137《Insulated bushing for alternating voltages above 1000V》. when the products are handed over. In generally,the products need no maintenance basically.It is enough to check the primary winding capacity and dielectric loss factor every 2~3 years.
■ Transportation and installation
· The products should be packed by shockproof material when they are transported.
· Pay attention to the external insulation when the products are suspended.
· Documents：certificate,test report,product manual.They should be put into packing box with the products.
· Please earth reliably the terminal of the products after installing.
■ Notice for order
You should specify the following parameters at least when ordering：
· Electric parameters：rate voltage,rate current,rate frequency,external insulation,net insulation distance,oli end length,length of the draw lead,CT mounting position length.
· Environment condition：ambient air temperature,altitude,pollution class,installation way.
We can offer the special products too.
Customized bushings size according to customer needs.
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