75 kVA Single Phase Pole Mounted Transformer

Product overview: 

•  WONE is a professional manufacturer of distribution transformers with 10 years of manufacturing experience.

• The single-phase Pole-Mounted transformers designed and produced are usually used for urban and rural power distribution.

• Input voltages：11kv, 12.4kv, 13.2kv, 13.8kv and 34.5kv; Output voltage：240 / 480v, 120 / 240V, etc. 

• Executive Standards: IEEE C57, ANSI C57, IEC60076 .

Leading technology：

•  Unique winding technology to improve lightning resistance.

•   Small magnetic leakage, high mechanical strength, strong short circuit resistance.

• Iron core 45° full oblique joint step laminated structure .

The shell：

• Mitsubishi laser cutting machine and CNC punching, reducing, folding and other equipment to ensure the accuracy of processing.

• ABB robot automatic welding, laser detection, to avoid leakage, qualified rate of 99.99998%.

• Electrostatic spray treatment, 50 years of paint (coating corrosion resistance within 100h, hardness ≥0.4).

• Cylindrical fully sealed construction with self-sealing manual pressure relief valve (according to ANSI specification).

• Standard NEMA hanger bracket (each device includes pole support bracket plate).

• Fully sealed structure, maintenance-free, normal operation life of more than 30 years.

The iron core：

• The core material is high quality cold rolled grain oriented silicon steel sheet with mineral oxide insulation (from Baowu Steel Group China).

• Minimize loss level, no-load current and noise by controlling the cutting and stacking process of silicon steel sheet.

winding：

•  Low voltage windings are made of high quality cable paper wrapped wire.

• High voltage windings are made of high quality polyurethane enamelled round copper wire.

• Interlayer insulation using dot adhesive paper, so that the coil bonding into a fixed unit, with excellent insulation resistance.

• Transformer structure is reliable during normal operation and transportation.

High quality material:

• Baowu Steel Group production of silicon steel sheet.

• High quality anaerobic copper from China.

• CNPC (Kunlun Petroleum) High quality transformer oil (25#).

Other:

•  High strength polymer low pressure casing or high and low pressure porcelain casing.

• Equipped with ring type full copper tinned terminal.

•  Install limited current fuses and arresters.

Ordering instructions:

•  Main parameters of transformer (voltage, capacity, loss and other main parameters) .

• Transformer use environment (altitude, temperature, humidity, place, etc) .

• Other customized requirements (tap switch, color, oil pillow, etc) .

• The minimum order quantity is 1 set, global delivery within 7 days .

•  The normal delivery period is 30 days, with fast delivery worldwide .

How does the oil-immersed transformer work as a fire protection device?

Protection Devices：
Gas Relay：

When a fault occurs inside the transformer, such as local overheating, electric arc discharge, etc., the insulating oil will decompose and produce gas. The gas relay is installed in the connecting pipeline between the oil tank and the conservator of the oil - immersed transformer.
Once a certain amount of gas is detected, the gas relay will act. It can take different measures according to the severity of the fault. For example, when the light - gas action occurs, an alarm signal will be sent to remind the operation personnel to check; when the heavy - gas action occurs, the power supply of the transformer will be directly cut off to prevent the fault from further expanding and causing a fire.

Fire Isolation Measures：
In the installation environment of the transformer, fire isolation facilities are usually set up. For example, in a substation, an oil - immersed transformer may be installed in an independent fire - proof compartment.
The fire - proof compartment is constructed with fire - resistant materials, such as fire - bricks, fire - proof coatings, etc. These materials can prevent the spread of fire for a certain period of time (such as 1 - 2 hours, depending on the material properties), buying time for firefighters to come and put out the fire.
In addition, fire - proof dikes may be set up around the transformer to prevent the large - area fire caused by the outflow of insulating oil after the rupture of the transformer's oil tank. The fire - proof dikes can limit the leaked oil within a certain range.