Oil-immersed electric load switch

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BFY-type oil-immersed load switch
BFY type oil-immersed load break switch

This switch is used in packaged transformers. Load switches are available in four‑position and two‑position configurations; the four‑position type can be further classified into T‑type, V‑type, and }‑type designs. The switch is mounted on the enclosure wall of the packaged transformer and employs transformer oil as both the insulating and arc‑quenching medium. It is suitable for 50 Hz systems with maximum equipment voltages of 12 kV and 40.5 kV, and rated currents of 315 A and 630 A, serving three‑phase power supply circuits. In terminal‑supply or ring‑network distribution systems, it functions as a control and protective device for industrial and residential electrical power. Actuated by a operating lever, the switch enables three‑phase coordinated opening and closing under load conditions, as well as the ability to change the power supply configuration.

This switch is used for compounded type transformer. It is classified into four-position and two-position products. Thefour-position switch is divided into“T”type、“V”type and“I”.The switch is installed on the tank well of compoundedtransformer, the transformer oil is used for its insulating and are eliminated material. It is suitable for three phase power supply circuit with rated frequency 50Hz, highest voltage for equipment 1 2kV、40.5kV, rated current 315 A and 630A. In the radialfeed or loop feed supply system, it is used as controlling and protective device in the industry civil used electric energy. When functioned by operating pole, the switch can drive three phase linkage cut and close power resource or transfer supply method.

Meaning of Load Switch Model Designations
Type of load break switch
 

Load switches of each voltage class shall withstand the test voltages specified in the following table when immersed in transformer oil.
Voltage class of load switch should withstand the test voltage in transformer oil shown in following table

Outline drawing of the BFY3I two‑station load switch
Overall drawing for two-position load break switch

Hole‑drilling and Welding Drawing for the Wall of a Two‑Station Switchgear Box
Sketch diagram for making hole on the two-position tank wall and welding

Installation Diagram and Model of a Two-Position Load Switch with Signal
Two-position load switch with signal installation diagram and its type

Explanation of Derivation Codes for Load Switches with Signal Contacts at Two Workstations
Derived code for two position load switch with signal contact

If a 35 kV two‑bay load switch with independent wiring, featuring two open and two closed positions, is required, the model is BFY3I2-35/630-20-II K2.
If 35kV two-position load switch with independent wiring is needed The type of BFY312-35/630-20- II K2 has two open and two close working position.

Installation dimension drawing of the switch’s external appearance (for electric operation, add “D” after the switch model). For example, the 35 kV two‑position electric‑operation model is designated BFY312-35/630-20-D.
Outline installation drawing for load switch《For electric -driven operation type with the letter D》,BFY312-35/630-20- II -D is of 35kV electric -driven operation type.

The FD‑1 type two‑station load switch is equipped with an electric operating mechanism, featuring a compact and reliable design. It is easy and convenient to install and provides clear indication of the open/close status. When used in conjunction with a controller, it supports both electric and direct manual operation, offering flexible and convenient switching.
Two-position load switch with electric-driven operating mechanism is called type FD-1 .The product is compact and reliable, and easy to install, the open and close statue is marked very clearly，it is suitable for automatic and manual operation， the control mechanism could be converted flexibly and conveniently.

1. Controller operating voltage: AC 220V;
2. The controller of the electric operating mechanism must remain continuously powered; the power supply must not be derived directly from the low-voltage side of the transformer. An independent backup power source is required to ensure that, during switching operations, the motor of the electric mechanism does not suddenly stop due to a power outage in the transformer, thereby preventing the mechanism from failing to reach its full travel and becoming jammed.
3. The controller cable is supplied with a length of 5 m; if an extension is required, please notify the user.

1. Controller operating voltage: AC 220V;
2. The controller equipped with a power-driven operating mechanism must always maintain a power supply. The power supply cannot be directly connected to the low-voltage side of the transformer; an additional backup power source must be provided to ensure that, during load switch operation, the motor in the power-driven mechanism does not suddenly stall due to a transformer power outage, thereby preventing the mechanism from becoming misaligned or jammed.
3. Controller cable shall be 5 meter long, if need longer please putting forward by users.

Outline drawing of a four-position T-type load switch
Overall drawing for four-position load break switch

Hole‑drilling and Welding Drawing for the Wall of a Two‑Station Switchgear Box
Sketch diagram for making hole on the two-position tank wall and welding

Outline drawing of a four-position V-type load switch
Overall drawing for four-position load break switch

Load Switch Wiring Diagram
Terminal connection diagram for type load swith