Abstract: A tap changer arrangement including a tap changer housing having a longitudinal extension along a first axis, wherein the tap changer housing comprises a first interface part fixedly attachable to a support structure of a transformer tank, a second interface part at a distal part of the tap changer housing, and an intermediate housing part arranged between the first interface part and the second interface part, the first interface part, the intermediate housing part and the second interface part being arranged on the first axis. The tap changer arrangement includes a plurality of support elements that is mechanically connected to the second interface part and either mechanically connected to the first interface part or to a support structure of the transformer tank, the support elements being configured to exert a compressive force on the intermediate housing part from the first interface part and from the second interface part.

Abstract: A shaft system for transmitting a torque includes a first component configured to deliver torque from a drive shaft, a first shaft connectable to the first component, and a second shaft connectable to, and axial extendable relative to, the first shaft. The first shaft includes a toothed structure configured to mate with a toothed structure of the first component in a first coupling, and to mate with a toothed structure of the second shaft in a second coupling, such that in operation of the shaft system, torque is transferred from the first component to the second shaft via the first shaft.

Abstract: A tap changer arrangement including a tap changer housing having a longitudinal extension along a first axis, wherein the tap changer housing comprises a first interface part fixedly attachable to a support structure of a transformer tank, a second interface part at a distal part of the tap changer housing, and an intermediate housing part arranged between the first interface part and the second interface part, the first interface part, the intermediate housing part and the second interface part being arranged on the first axis. The tap changer arrangement includes a plurality of support elements that is mechanically connected to the second interface part and either mechanically connected to the first interface part or to a support structure of the transformer tank, the support elements being configured to exert a compressive force on the intermediate housing part from the first interface part and from the second interface part.

Abstract: A contact bounce reduction system including: a movable member, and a contact bounce damping device including: a body, a first ball and a second ball, a first resilient member and a second resilient member, a piston. The first resilient member holds the first ball in the seat and the second resilient member holds the second ball in the seat when the piston is in a default extended position, and a third resilient member biases the piston towards the default extended position. The movable member actuates the piston towards the retracted position, causing the first ball and the second ball to move radially out from the seat, and the third resilient member to accumulate energy.

Abstract: The disclosure relates to a shaft system for transmitting a torque. The shaft system includes a first component configured to deliver torque from a drive shaft, a first shaft connectable to the first component, and a second shaft connectable to, and axial extendable relative to, the first shaft. The first shaft includes a toothed structure configured to mate with a toothed structure of the first component in a first coupling, and to mate with a toothed structure of the second shaft in a second coupling, such that in operation of the shaft system, torque is transferred from the first component to the second shaft via the first shaft.

Abstract: A contact bounce reduction system including: a movable member, and a contact bounce damping device including: a body, a first ball and a second ball, a first resilient member and a second resilient member, a piston. The first resilient member holds the first ball in the seat and the second resilient member holds the second ball in the seat when the piston is in a default extended position, and a third resilient member biases the piston towards the default extended position. The movable member actuates the piston towards the retracted position, causing the first ball and the second ball to move radially out from the seat, and the third resilient member to accumulate energy.

Abstract: An actuator for a tap changer of an electrical transformer, including: a piston, being hollow to define a piston space; a cylinder arranged around the piston such that the piston is arranged to be movable axially into and out of the cylinder; a piston ring fixed to the outside surface of the piston such that a cylinder space is formed between the piston and the cylinder and delimited by the piston ring, the cylinder space having a variable volume which is configured to vary with axial movement of the piston; and a spring engaging both the piston and the cylinder such that the spring is able to be compressed and elongated, respectively, with axial movement of the piston. The piston space is connected to the cylinder space via at least one hole through the hollow piston. The piston space is connected to an outside of the piston.

Abstract: An actuator for a tap changer of an electrical transformer, including a piston, being hollow to define a piston space; a cylinder arranged around the piston such that the piston is arranged to be movable axially into and out of the cylinder; a piston ring fixed to the outside surface of the piston such that a cylinder space is formed between the piston and the cylinder and delimited by the piston ring, the cylinder space having a variable volume which is configured to vary with axial movement of the piston; and a spring engaging both the piston and the cylinder such that the spring is able to be compressed and elongated, respectively, with axial movement of the piston. The piston space is connected to the cylinder space via at least one hole through the hollow piston. The piston space is connected to an outside of the piston.

Abstract: An arrangement in a rock drill rig 10 has an inlet valve 31 arranged upstream from a displacement compressor 32 that is used for supplying an air flow 34 to at least one flushing hole 23 in the surface of a drill bit 20. The rock drill rig 10 also has an air regulator 35 arranged to regulate the system pressure in the air flow path 34 downstream from the compressor and a detector for detecting air flow through the at least one flushing hole 23 in the surface of the drill bit. The detector has a pressure sensor 36, arranged between the air regulator 35 and the inlet valve 31, for measuring the reduced system pressure.

Abstract: The present invention relates to an arrangement in a rock drill rig 10 comprising an inlet valve 31 arranged up-stream a displacement compressor 32 that is used for supplying an air flow 34 to at least one flushing hole 23 in the surface of a drill bit 20. The drill rig 10 further comprising an regulator 35 arranged to regulate the system pressure in the air flow path 34 downstream the compressor and means for detecting an flow of air through the at least one flushing hole 23 in the surface of the drill bit. The detecting means comprises a pressure sensor 36, arranged between the air regulator 35 and the inlet valve 31, adapted to measure the reduced system pressure.