Candle Tin Vacuum Resin Casting Machine Drying Oven For Power Transformer

Vacuum drying oven for power transformer with Pressure Increasing Drying plant(Candle Tin)

Product Apperance:

A vacuum drying oven with a Pressure Increasing Drying (PID) plant, using a candle tin, is a specialized equipment setup commonly used for drying power transformers. This method is known as the vacuum and pressure drying process. Here's how it typically works:

Vacuum Drying: The power transformer is placed inside a vacuum drying oven. The oven creates a low-pressure environment by removing air and moisture from the chamber. This process helps in removing moisture from the transformer's insulation and windings.

Pressure Increasing Drying (PID) Plant: The PID plant is an integral part of the setup. It consists of a pressure vessel, often referred to as a candle tin, which is connected to the vacuum drying oven. The candle tin is designed to withstand high pressures.

Pressure Increase: Once the vacuum drying phase is complete, the pressure inside the oven is slowly increased by introducing an inert gas (such as nitrogen) into the candle tin. By increasing the pressure, any remaining moisture trapped within the transformer's insulation is forced out.

Heat Application: During both the vacuum and pressure increase phases, heat is applied to the oven. The temperature is carefully controlled and gradually increased to facilitate the drying process. The temperature range and duration depend on the specific requirements of the transformer being dried.

Moisture Removal: As the pressure increases and the temperature rises, the moisture within the transformer evaporates and is carried away by the inert gas. The moisture-laden gas is then expelled from the oven.

Cooling and Venting: Once the desired drying level is achieved, the oven is cooled down, and the pressure is gradually reduced. This ensures that the transformer and its insulation regain ambient conditions without causing thermal stress.

The vacuum drying oven with a Pressure Increasing Drying plant (Candle Tin) is an effective method for drying power transformers. It helps eliminate moisture, enhance the insulation properties, and ensure optimal performance and longevity of the transformer. It is often used during the manufacturing process or when maintenance work is carried out on transformers.

1. EQUIPMENT COMPOSITION

2. TECHNICAL INDICATORS AND PARAMETERS OF EQUIPMENT:
   1. Vacuum pouring pot size Φ2000×L2400
   2. The pumping speed of the main pumping pump of the vacuum system is 300L/S
   3. Working temperature of pouring tank is 70 ~ 85℃
   4. Ultimate vacuum degree of pouring tank (cold state, no load) ≤50Pa
   5. Pouring tank leakage rate ≤50Pa.L/S
   6. The working vacuum of pouring tank is 50 ~ 100Pa
   7. The equipment adopts manual metering and dynamic mixing of materials.
   8. The equipment adopts vacuum casting process.
   9. The mixing tank adopts electric heating, heat conduction oil as heat transfer medium and automatic temperature control. The pouring tank is directly heated by electric heating element. All heating parts are insulated with thermal insulation materials, and the pouring tank is armored with stainless steel plate (SUS430); The mixing tank is armored with thin steel plate and coated on the surface. The surface temperature of the insulation layer is not higher than 20℃ room temperature.
3. EQUIPMENT POWER, WATER, AIR SOURCE AND BASIC CONDITION

REQUIREMENTS, (USER EQUIPPED WITH: POWER SUPPLY, AIR COMPRESSOR):

1. Rated power: 80kw, 380V, 50Hz, three-phase five-wire special distribution cabinet, power connected to the electric control cabinet.
2. Water source: pressure ≥0.2Mpa, maximum consumption 3m3/h, water temperature ≤25℃.
3. Compressed air: 0.4 ~ 0.6Mpa, maximum consumption of 0.3m3/min
4. Make foundation, steel frame and outer track of embedded tank according to our design drawings.

4. TECHNICAL CONDITIONS OF EACH SYSTEM:
   1. A SET OF 400L VACUUM MIXING DEGASSING TANK

Technical specification and application of tank

The effective volume is 400L

Heat conduction oil 10KW

Ultimate vacuum: 50Pa (no load, cold state)

No load leakage rate: 50Pa.L/S

Operating temperature: 60 ~ 80℃

Tank surface temperature Ambient temperature +20℃

Equipped with frequency control device, can adjust the stirring lifting speed according to the viscosity of the material;

Rock wool insulation, stainless steel plate (SUS430, 1.5mm thick) armored, surface coating

This tank is used for mixing epoxy resin and curing agent mixture and vacuum degassing.

The mixing tank is installed on the pouring master side of the vacuum pouring tank to increase production.

TANK BODY ACCESSORIES:

4.2 A SET OF VACUUM POURING TANK (ATMOSPHERIC PRESSURE) SYSTEM Vacuum tank technical specifications and uses:

Horizontal tank inner wall size: Φ2000mm×2400mm

Ultimate vacuum: 50Pa (no load, cold state)

No load leakage rate: 50Pa.L/S

Operating temperature: 70 ~ 85℃

Tank surface temperature: ambient temperature +20℃

The casting supervisor adopts pneumatic ball valve for feeding, and can adjust the vacuum casting valve actually needed according to the number of products. The spare flange interface of the casting pipe is reserved for future upgrading.

The pouring tank is horizontal, the door of the tank is swung open on the side, and the tank body is of vacuum pouring tank structure. After the door is closed in place, the tank is clamped.

The vacuum casting process can optimize the casting process, increase the permeability of the material, and finally achieve the effect of reducing the release index of the product.

Lock the can card manually after the can door is closed in place.

The tank body is installed on the ground, and light rail and working trolley (reinforced) are provided in the tank.

The outer surface of the tank is heated by electric heating plate.

The height of the track inside the tank is flush with the track of the transfer trolley outside the tank (self-made by the user of the transfer trolley outside the tank), so as to facilitate the access of the trolley;

Rock wool insulation, stainless steel plate (SUS430) armored processing.

The tank body is provided with other interfaces to meet the technological requirements.

TANK ATTACHMENT

4.3 TWO SETS OF HEATING SYSTEM

4.3.1 Each unit of the equipment is controlled by an independent temperature control system, which is convenient for each unit to adjust the temperature. The mixing tank adopts heat transfer mode of heat conduction oil. The pouring tank is directly heated by Wuxi electric heating plate, automatic temperature control, overtemperature alarm, 63KW power, the highest heating temperature of 130℃. The heating temperature of all the mixing tank heating system can be adjusted between normal temperature and 80℃.

SYSTEM CONFIGURATION:

HEATING SYSTEM FOR 400L FINAL MIXING TANK:

HEATING SYSTEM FOR VACUUM POURING TANK:

4.4 TWO SETS OF VACUUM SYSTEM (A TOTAL OF 3 VACUUM PUMPS):

4.4.1. The maximum pumping speed of a rotary sheet Roots unit to the pouring tank vacuum unit is 300L/S. The working vacuum of the system can be controlled between 50-200Pa; Reduce the possibility of material being pumped into the vacuum system due to high vacuum degree; The system is equipped with 2 sets of special filters to prevent impurities in the pumped gas to the maximum extent and capture condensing condensable gas to protect the vacuum pump.

CONFIGURATION ATTACHMENT:

SYSTEM CONFIGURATION ATTACHMENT: