Product Overview:SR-JXB Series Transformer Neutral Point Overvoltage Protection Device
SR-JXB Series Transformer Neutral Point Overvoltage Protection Device is specially used in 110kv, 220kV transformer neutral point return circuit, which will prevent the neutral point insulation from overvoltage damage, and realize the conversion of earthing running and earthing free running of transformer neutral point.
Required by the operation of electric power system, most transformer neutral points of 110-220kV effective earthing system adopts earthing free operation method, The transformer mainly adopts grading insulation structure, whose insulation level is relatively low.So lightening overvoltage.operation overvoltage and work frequency transient overvolage protection shall be adopted in earthing-free transformer neutral points.
Presently,the neutral point overvoltage protection mainly adopts protective gap, arrester protection and parallel connection protection of gap and arrester. The protective gap mainly restricts work frequency overvoltage, operation overvoltage and resonance overvoltage. it can also restrict lightening overvoltage to some extent. Zinc oxide arrester protection can mainly restrict lightening overvoltage, when it is required to protect lightening, work frequency and operation overvoltage, the parallel connection protection of gap and arrester can be adopted. At this moment, the gap can protect both the neutral point of transformer and the arrester, it can also prevent the arrester from expiosion because of insufficient flow.
Specifications and Parameters:
| Product model | Rated voltage of the transformer | Transformer neutral point insulation level | Disconnecting switch | Zinc oxide arrester | Discharge gap | Current transformer | ||||||||
| Lightning surge full wave clipping withstand voltage (peak value) | short time work frequency withstand voltage (peak value) | Model | Rated current |
Operation mechanism |
Model | Rated voltage | Continuous operation voltage |
Voltage(no less than) DC 1mA reference | Current residual voltage (peak value)8/20 μs lightning surge | Voltage work frequency discharge | Type | Ratio of transformation | ||
| 10±%(effective value) | ||||||||||||||
| kV | kV | kV | A | kV | kV | kV | kV | kV | ||||||
| SR-JXB-110 | 110 | 250 | 95 | GW8/13-72.5 | 630 | CS14G/CS11 (manual) CJ2(motor- driven) |
Y1.5W-72/186 | 72 | 58 | 103 | 186 | 83 | Whole sealing post type epoxy resin pouring 10kV | 200/5 |
| SR-JXB-220 | 220 | 400 | 200 | GW8/13-126 | Y1.5-144/320 | 144 | 116 | 205 | 320 | 166 | ||||
Product Features:
Stable features and effective protection: SR-JXB series neutral point overvoltage protection device adopts stainless steel hemispherical clavate gap with stable features, which can cooperate with the arrester and the insulation of transformer accurately. It has large heat capacity, uneasy to be burnt up and increases the safety, reliability and protection effect.
Flexible combination and convenient usage: The discharging gap, arrester and disconnect switch of SR-JXB series neutral point overvoltage protection device can be selected and combined according to the requirements, The user can select the pure gap proposal, or the combination of disconnect switch and discharging gap, or the parallel! connection of disconnect switch, discharging gap and arrester. The disconnect switch can select GW8 or GW13 type. The operation mechanism can select manual or motor-driven. The technical parameters of gap can be debugged in the factory, or regulated on site, which is very convenient.
Good anti-corrosion function. The electrode is made of stainless sleel, The foundation of the device adopts hot galvanizing treatment.The operation mechanism box of disconnecting switch and mutual inductor box are both made of stainless steel.
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