Three-position disconnecting switch for locomotive and use method thereof

Abstract

The invention discloses a three-position disconnecting switch for a locomotive and a use method thereof. The switch comprises a first wire inlet position used for gating a power supply between locomotives to supply power to a wire outlet position; a second wire inlet position, used for gating a grounded circuit of the wire outlet position; a third wire inlet position, used for gating a line of the pantograph for supplying power to the wire outlet position; an operating mechanism, a detector and a frame body. The method comprises the following steps of: 1, classifying the working types of the disconnecting switches; 2, a workshop power supply supplying power to a wire outlet position; 3, grounding a wire outlet position; and 4, the pantograph supplying power to the wire outlet position. The structure is simple, the design is reasonable, the first wire inlet position and the wire outlet position, the second wire inlet position and the wire outlet position or the third wire inlet position and the wire outlet position are connected and conducted through the arrangement of the isolation knife assembly, and it is effectively avoided that the first wire inlet position, the second wire inlet position and the third wire inlet position are connected and conducted with the wire outlet position at the same time; therefore, a workshop power supply and a pantograph are prevented from supplying power to a train at the same time, mechanical locking of the disconnecting switch is effectively achieved, and power supply safety is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of isolating switches, and in particular relates to a three-position isolating switch for locomotives and a method for using the same. Background technique [0002] With the rapid development of the national economy, urban rail transit has become an important means of public transportation in medium and large cities. The development of rail transit has brought a large demand for electric locomotives, and people have higher and higher requirements for equipment and personal safety. [0003] The power receiving mode of domestic rail vehicles usually has two combinations of pantograph power supply and workshop power supply. The high-voltage circuits of the two modes are not allowed to be connected to the power supply at the same time, and each high-voltage circuit needs to be locked each other, so the control requirements for the circuit are stricter , The safety of power supply puts forward higher requirements...

AI Technical Summary

Problems solved by technology

The conventional logical control relationship is to use the auxiliary contacts of the contactors in the control circuits of high-voltage electrical appliances to lock each other to achieve position switching. The possibility of misoperation cannot be completely ruled out by relying on the interlocking between electrical appliances, and the safety is poor.

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