CN-122025476-A - High-voltage direct-current contactor with double protection functions

CN122025476ACN 122025476 ACN122025476 ACN 122025476ACN-122025476-A

Abstract

The invention provides a high-voltage direct current contactor with double protection functions, which belongs to the technical field of high-voltage direct current circuit protection and comprises a moving contact, a fixed contact and a driving unit, wherein the driving unit is used for driving the moving contact to displace relative to the fixed contact so as to realize opening and closing actions; the excitation cutting unit moves towards the direction of the moving contact under the driving action of the cutting control signal to drive the moving contact to separate from the fixed contact, and cuts off the moving contact to disconnect the main loop. The device has the advantages that a double protection mechanism of normal opening and closing and fault forced opening and closing is adopted, when the current of the main circuit works normally, normal opening and closing actions are achieved by driving the moving contact to displace relative to the fixed contact, when the fault current of the main circuit occurs, the excitation cutting-off unit can drive the moving contact to be separated from the fixed contact so as to disconnect the main circuit and cut off the moving contact, the fault current can be cut off rapidly through excitation even if the normal opening and closing fails, forced breaking is achieved, and the reliability of the contactor is improved.

Inventors

QIAO SHUO
WANG YA
LI YANQIANG
XIA XINJUN
ZHANG WEI
WANG JUN

Assignees

上海维安电子股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260323

Claims (10)

1. The utility model provides a high voltage direct current contactor with dual protect function, includes the shell body, its characterized in that, the inside cavity of shell body is equipped with: the device comprises a moving contact, a fixed contact and a driving unit, wherein the driving unit is used for driving the moving contact to displace relative to the fixed contact so as to realize opening and closing actions; And the excitation cutting unit moves towards the direction of the moving contact under the driving action of a cutting control signal to drive the moving contact to be separated from the fixed contact so as to disconnect the main loop and cut off the moving contact.
2. The high-voltage direct-current contactor with double protection functions according to claim 1, wherein the chamber of the outer housing includes a first chamber and a second chamber, the moving contact, the fixed contact and the excitation cut-off unit are disposed in the first chamber, and the driving unit is disposed in the second chamber.
3. The dual protection high voltage dc contactor of claim 1, wherein said housing chamber further comprises a third chamber having an arc suppressing melt disposed therein; the arc extinguishing device is characterized by further comprising an insulating cushion block, wherein the insulating cushion block is arranged on two sides below the moving contact, arc striking devices are arranged on the upper surface and the outer side wall of the insulating cushion block, and the arc striking devices are electrically connected with two ends of the arc extinguishing melt; And the moving contact moves to be in contact with an arc striking device on the insulating cushion block under the driving action of the excitation cutting-off unit so as to guide the fault current of the main loop to the arc extinguishing melt.
4. The high-voltage direct-current contactor with double protection functions according to claim 3, wherein a first supporting stop block is arranged on the insulating cushion block; The movable contact is provided with a first connector and a second connector, the first connector is arranged in the middle of the movable contact, the first connector is connected with the driving unit, the second connector transversely surrounds the weak structure on the movable contact in a ring-shaped structure, the second connector impacts and breaks the first supporting stop block under the driving action of the excitation cutting unit, and the first supporting stop block is abutted to the insulating cushion block after continuous displacement and simultaneously cuts off the weak structure of the movable contact.
5. The dual protection high voltage dc contactor of claim 3 wherein said arc suppressing melt is surrounded by an arc suppressing medium, said arc suppressing melt having a neck structure disposed thereon.
6. A high voltage direct current contactor with double protection function according to claim 3, wherein the weak structure comprises a first weak structure and a second weak structure, the first weak structure is broken under the driving action of the excitation cutting unit, and the broken movable contact part is bent around the second weak structure.
7. The dual protection high voltage dc contactor according to claim 3, further comprising: The arc extinguishing grid piece is embedded in the inner side wall of the insulating cushion block and is positioned below the cutting-off opening of the moving contact.
8. The dual protection high voltage dc contactor according to claim 1, further comprising: and the arc blowing device is arranged in a cavity where the moving contact and the fixed contact are located and is used for performing magnetic arc blowing and extinguishing on the electric arc generated between the moving contact and the fixed contact during opening and closing actions.
9. The dual protection high voltage dc contactor according to claim 2, wherein said first chamber and said second chamber are separated by a partition, said driving unit comprising: The driving coil is circumferentially arranged on the coil base; The static iron core is arranged on the cavity separation partition plate; the movable iron core is arranged below the static iron core and positioned in the middle of the coil base, and performs reciprocating displacement along the axial direction of the coil base; The movable guide rod penetrates through the first cavity and the second cavity, one end of the movable guide rod is connected with the movable contact, the other end of the movable guide rod is connected with the movable iron core, a movable contact spring is sleeved on the part of the movable guide rod, which is located in the first cavity, and a second supporting stop block is arranged on the part of the movable guide rod, which is located in the second cavity, and a movable iron core spring is sleeved on the part of the movable guide rod.
10. The high-voltage direct-current contactor with double protection functions according to claim 1, wherein the chambers of the moving contact and the fixed contact are filled with protection gas.

Description

High-voltage direct-current contactor with double protection functions Technical Field The invention relates to the technical field of high-voltage direct current circuit protection, in particular to a high-voltage direct current contactor with a double protection function. Background The contactor is a core on-off device in a high voltage direct current system. The traditional high-voltage direct-current contactor generally relies on electromagnetic drive to perform switching-on and switching-off operation, so that switching-on and switching-off of load current are realized. However, when a main circuit has a fault current such as short circuit or overload, the contactor may cause fusion welding of the contacts due to excessive arc energy, thereby causing breaking failure or even explosion. The existing protection scheme mostly adopts a series combination of a contactor and a fuse. However, the response of the fuse to low overload current is uncertain, the fuse is difficult to match with the current parameters of the contactor, a protection dead zone is easy to appear, the protection range is limited, the occupation space of the discrete contactor and the fuse is large, and the self resistance of the fuse is high, so that the temperature rise and the power consumption of the system are increased. Meanwhile, the fuse needs to be replaced after the action, so that the maintenance cost is high, and the breaking reliability is low. Disclosure of Invention In order to solve the technical problems, the invention provides the high-voltage direct current contactor with the double protection function, which can realize the switching-on and switching-off operation of the contactor through the low-voltage control loop under the normal working state, and simultaneously realize the rapid and safe breaking of the contactor through high-voltage excitation when the main loop has abnormal conditions such as overload current, short-circuit current and the like, thereby solving the problems of difficult arc treatment, insufficient fault current protection, short service life, poor environmental adaptability and the like of the conventional direct current contactor in a high-voltage direct current system. The technical problems solved by the invention can be realized by adopting the following technical scheme: the utility model provides a high voltage direct current contactor with dual protect function, includes the shell body, the inside cavity of shell body is equipped with: the device comprises a moving contact, a fixed contact and a driving unit, wherein the driving unit is used for driving the moving contact to displace relative to the fixed contact so as to realize opening and closing actions; And the excitation cutting unit moves towards the direction of the moving contact under the driving action of a cutting control signal to drive the moving contact to be separated from the fixed contact so as to disconnect the main loop and cut off the moving contact. The high-voltage direct-current contactor with the double protection functions comprises a first chamber and a second chamber, wherein the moving contact, the fixed contact and the excitation cutting-off unit are arranged in the first chamber, and the driving unit is arranged in the second chamber. The high-voltage direct-current contactor with the double protection function provided by the invention has the advantages that the cavity of the outer shell also comprises a third cavity, and an arc extinguishing melt is arranged in the third cavity; the arc extinguishing device is characterized by further comprising an insulating cushion block, wherein the insulating cushion block is arranged on two sides below the moving contact, arc striking devices are arranged on the upper surface and the outer side wall of the insulating cushion block, and the arc striking devices are electrically connected with two ends of the arc extinguishing melt; And the moving contact moves to be in contact with an arc striking device on the insulating cushion block under the driving action of the excitation cutting-off unit so as to guide the fault current of the main loop to the arc extinguishing melt. The high-voltage direct-current contactor with the double protection function is characterized in that a first supporting stop block is arranged on the insulating cushion block; The movable contact is provided with a first connector and a second connector, the first connector is arranged in the middle of the movable contact, the first connector is connected with the driving unit, the second connector transversely surrounds the weak structure on the movable contact in a ring-shaped structure, the second connector impacts and breaks the first supporting stop block under the driving action of the excitation cutting unit, and the first supporting stop block is abutted to the insulating cushion block after continuous displacement and simultaneously cuts off the weak structure of the movable contact.