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Internal oil leakage protection type
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Internal oil leakage protection type metal corrugate conservator for transformer adopts the advanced super flexible stainless steel bellows that is the volume compensation element and the isolation seal element. The volume compensation for transformer insulation oil is realized. When the insulation oil expands or contracts with the change of temperature, the bellows is pushed up and down, thus changing the volume of the oil cavity in the conservator to realize the volume change compensate of the insulating oil.


Wide range for applicable type—The common compensation volume range of the conservator is from 0.1~15m3(the oil weight about 90~13425kg in 20℃), which is suitable for various types ofoil-immersed transformers and other power equipments with total oil weight of transformer not more than 90t, the voltage is below 1000KV and the capacity is below 1000MVA.

Fully sealed structure—Bellows has the function of oil leakage protection, no sundry entry, debris accumulation will not be caused by the long-term running.

High compensation ability—The conservator adopts single core, has compact structure, small invalid space and large compensation capacity.

Long service life—The compensation component is stainless steel, without aging, the product life can reach 30 years, and has the same lifetime with transformer, the products realize maintenance-free.

Can vacuum filling—The negative pressure capacity of the bellows is -0.1Mpa, which fully meets the requirement of full vacuum filling.

Super flexible—The bellows adopts supper flexible design, and the maximum opposite force of the bellows is less than 0.006MPa, which does not affect the normal setting of the transformer protection device.

No Guiding device—The conservator adopts special process technology, no need to install guide wheel and guide rail, and the bellows is stable, safe and reliable operation.

Oil level gauge—The external magnetic coupling retroflex oil level gauge is used to completely isolate the oil storage cavity, which is convenient for inspection and replacement. It is safe, reliable and accurate.

Oil level remote transmission—It is easy to realize the remote transmission of oil level signal, and can be configured with multi-function oil level signal remote device according to the user's requirement, which can realize remote computer monitoring.


1.Model selection

①Provide transformer total oil weight, min and max environment temperature for transformer use area.

②Refer to the following figure to give the relative size of transformer connection, specify special requirements, such as switch cabinet, vacuum oil filling, oil level remote transmission, oil level gauge rain cover, etc.

③The manufacturer shall cooperate to select the model of conservator, and finally determine the product structure size.

2.Selection methods

①According to the total oil weight of the transformer, check the last column of the table, and select the optimal conservator size (width and length) suitable for transformer space in the model that meets the requirements of many types.
②Calculate the minimum rated compensation of the conservator according to the total oil weight and maximum temperature difference of the transformer.
③Then, the minimum rated compensation for the design requirements is indicated in the conservator model V, which is the confirmation of the model.
Example: 50MVA/110KV transformer, the total oil weight is 20t, and the compensation amount of conservator is more than 1800dm3.
The model of the conservator is: BP3N980x3500-1800, which is calculated by the manufacturer and the height of the conservator is 1080mm.

3.Product series parameter list

Note: This table is a regular series. The conservator of outside the table scope can be designed according to customers' requirements. Please contact our technical department.


1. Preparation before installation

①Release pressure: Open the breath vent, exhaust vent and oil injection vent, release the internal pressure of the conservator, and when opening the vale, it should be inhaled strongly.

②Use air pump to inflate from the breath vent, compress the bellows, and the oil level window shows the oil level falling continuously. When the oil level passes 0 (all white indicates), close the breath vent.

2.Conservator installation

①The conservator is installed in the position, connected with the transformer pipeline, and fix conservator.

②Connect the oil injection pipe and exhaust pipe to the lower part of the transformer and connect the valve with reliable seal.

③Connect the control circuit of oil level alarm device.

④After installation, prepare oil injection.

3.Oil injection procedure

Inject insulating oil: Open the valve of the breath vent and exhaust vent, and fill the conservator with oil from the transformer body or the oil injection vent;

Exhaust:The oil level indicator is continuously raised after oil injection, and when the indicator is close to the value corresponding to the oil temperature (one calibration in advance), close the breath vent (with the plug). Continue to inject until the air in the conservator is discharged from the exhaust vent and the oil is stable outflow, then close the exhaust vent and stop the oil injection.

Adjust the oil level:Open the breath vent to check whether the oil level is corresponding to the oil temperature curve. If the oil level is high, the oil should be properly discharged from the oil injection vent. If it is low, the oil can be replenished properly. The operation does not need to open the exhaust vent, but need to open the breath vent and keep opening.


※When the oilinjection is finished, the working stateof the conservator is the breath vent is normally open, and the exhaustvent and oil injectionvent are sealed reliably.

※Vacuumoiling ofconservator (therequirements should be mentioned whenordering)

If the conservator needsvacuum oiling togetherwith transformer body, the exhaust vent must be connected to the vacuum system through "the transition jar",and the breath vent must keep opening when vacuuming,and meet the specification requirements of the pressure value (minimum 13Pa). Open the oil valves, insulating oil under vacuum statewill passinto thetransformer tank andconservator. When transition oil isdischarged from exhaustvent into the transition jar,thenquickly shut down and sealexhaustvent, and continue toinjectoil through the oilinjection vent tomeetoil temperature corresponding to the oil level.

※Note:When vacuuming, the breath vent must be opened and the flow rate should be paid attention (It is recommended that the flow rate of oil injection machine is 30L/min).