CN-121983474-A - Closing resistor structure for circuit breaker

CN121983474ACN 121983474 ACN121983474 ACN 121983474ACN-121983474-A

Abstract

The invention relates to the field of circuit breakers, in particular to a closing resistor structure for a circuit breaker. The electric resistance device comprises a supporting plate and three groups of electric resistance strings, wherein the three groups of electric resistance strings are respectively an electric resistance string A, an electric resistance string B and an electric resistance string C, and each electric resistance string comprises an insulating rod vertically inserted into the supporting plate, two locking rings respectively clamped at the bottom and the top of the insulating rod, a bottom plate sleeved on the insulating rod and pressed on the lower locking ring, an insulating piece sleeved on the insulating rod and positioned at the top of the bottom plate, an electric resistance assembly sleeved on the insulating rod, a conductive barrel sleeved on the insulating rod and pressed on the top end of the electric resistance assembly, a first pressing plate sleeved on the insulating rod and arranged on the top end of the conductive barrel, a second pressing plate sleeved on the insulating rod and pressed on the bottom of the upper locking ring, and a spring tensioned between the first pressing plate and the second pressing plate. The invention can reduce the influence of the operation vibration of the circuit breaker on the closing resistance, and the resistor disc and other parts are not easy to loosen, thereby improving the reliability and stability of the circuit breaker.

Inventors

ZHANG JIANLEI
XU LIUYU
ZHAO HUANAN
XIA JIANJIAN
CHANG HAO
HUANG FENG
ZHANG QIZHENG
ZUO KEXIN

Assignees

山东泰开高压开关有限公司

Dates

Publication Date: 20260505
Application Date: 20251210

Claims (9)

1. A closing resistor structure for a circuit breaker, comprising: A pallet (1); The resistor strings are sequentially distributed into three groups, namely a resistor string A, a resistor string B and a resistor string C, and comprise an insulating rod (3) vertically inserted in a supporting plate (1), two locking rings (18) respectively clamped at the bottom and the top of the insulating rod (3), a bottom plate (4) sleeved on the insulating rod (3) and pressed on the lower locking ring (18), an insulating piece sleeved on the insulating rod (3) and positioned at the top of the bottom plate (4), a resistor assembly sleeved on the insulating rod (3), a conductive cylinder (14) sleeved on the insulating rod (3) and pressed on the top of the resistor assembly, a first pressing plate (15) sleeved on the insulating rod (3) and arranged on the top of the conductive cylinder (14), a second pressing plate (17) sleeved on the insulating rod (3) and pressed on the bottom of the upper locking ring (18) and a spring (16) tensioned between the first pressing plate (15) and the second pressing plate (17), the resistor string A, the resistor string B and the resistor string C are connected in series through the contact piece assembly, and current flows to sequentially circulate in the sequence of the resistor string B, the resistor string C, the resistor string B, the resistor string A, the resistor string B and the resistor string C.
2. A closing resistor structure for a circuit breaker according to claim 1, characterized in that the top ends of three conductive cylinders (14) in three resistor strings are flush.
3. The closing resistor structure for a circuit breaker according to claim 1, wherein the insulating members in the resistor string a and the resistor string C are an insulating pad one (5) and an insulating pad two (7), respectively, and the insulating member in the resistor string B is a transition plate (6).
4. A closing resistor structure for a circuit breaker according to claim 1, wherein the resistor components in the resistor string B and the resistor string C include an insulating pad three (11) and an insulating pad five (13) at the top ends, respectively.
5. The closing resistor structure for the circuit breaker according to claim 1, wherein the resistor assemblies in the resistor string A and the resistor string C comprise a plurality of resistor pieces (10) and insulating backing plates three (11) which are vertically distributed side by side, the insulating backing plates three (11) are positioned between the resistor pieces (10) of adjacent groups, the top of the resistor string A is a single group of the resistor pieces (10), the rest of the resistor pieces are the resistor pieces (10) of one group by two, the bottom of the resistor string C is a single group of the resistor pieces (10), the rest of the resistor pieces are the resistor pieces (10) of one group by two, the resistor assemblies in the resistor string B comprise a plurality of resistor pieces (10) and insulating backing plates four (12) which are vertically distributed side by side, and the insulating backing plates four (12) are in one-to-one correspondence with the resistor pieces (10) and are positioned below the corresponding resistor pieces (10).
6. The closing resistor structure for a circuit breaker according to claim 5, wherein the third insulating pad (11) and the fourth insulating pad (12) each have a boss portion with an upper convex portion in the middle and a lower convex portion in the middle, and the middle of the resistor sheet (10) has an inner hole into which the boss portion extends.
7. Closing resistor structure for circuit breaker according to claim 5, characterized in that in the two-by-two group of resistor pieces (10), an aluminum foil ring (19) sleeved on the insulating rod (3) is arranged between two resistor pieces (10).
8. Closing resistor structure for circuit breakers according to claim 7, characterized in that the aluminium foil ring (19) is of wave-shaped construction.
9. The switching-on resistor structure for a circuit breaker according to claim 1, wherein the contact piece assembly comprises a first contact piece (8) and a plurality of second contact pieces (9), the first contact piece (8) and the second contact piece (9) comprise two contact ring parts which are distributed in a staggered manner and a connecting strip part integrally connected between the two contact ring parts, the two contact ring parts of the first contact piece (8) are respectively sleeved on the insulating rods (3) in the resistor string B and the resistor string C, and the two contact ring parts of the plurality of second contact pieces (9) are respectively sleeved on the insulating rods (3) in the resistor string A and the resistor string B and the insulating rods (3) in the resistor string B and the resistor string C.

Description

Closing resistor structure for circuit breaker Technical Field The invention relates to the field of circuit breakers, in particular to a closing resistor structure for a circuit breaker. Background Circuit breakers are important protective devices in electrical power systems that can rapidly cut off current when a circuit fails to protect the safety of electrical equipment and the power grid. The switching-on resistor is an important component in the circuit breaker, and is used for limiting transient overvoltage when the circuit breaker is switched on and protecting electric equipment from being damaged by the overvoltage. The breaker can produce the impact force at the switch-on or break-off in-process, and when the contact motion, the impact force can be transmitted to the switch-on resistance fracture through the drive part, causes the vibration of resistance piece, because the resistance fracture is located behind two arc extinction fractures, causes the vibration amplitude of switch-on resistance great. The vibration may cause the connection between the resistor disc and other parts of the closing resistor to be loose, so that the resistor disc is displaced, the position of the resistor disc in the closing resistor is changed, the contact resistor is unstable, the normal work of the resistor is affected, and the function of limiting the operation overvoltage is further affected. Disclosure of Invention Aiming at the problems in the background technology, the invention provides a closing resistor structure for a circuit breaker, which can reduce the influence of the operation vibration of the circuit breaker on the closing resistor, is not easy to loosen between a resistor sheet and other parts, and improves the reliability and the stability of the circuit breaker. The technical scheme includes that the switching-on resistor structure for the circuit breaker comprises a supporting plate and resistor strings, wherein three groups of resistor strings A, B and C are sequentially distributed, each resistor string comprises an insulating rod vertically inserted into the supporting plate, two locking rings respectively clamped at the bottom and the top of the insulating rod, a bottom plate sleeved on the insulating rod and pressed on the lower locking ring, an insulating piece sleeved on the insulating rod and positioned at the top of the bottom plate, a resistor assembly sleeved on the insulating rod, a conductive tube sleeved on the insulating rod and pressed on the top of the resistor assembly, a first pressing plate sleeved on the insulating rod and arranged on the top of the conductive tube, a second pressing plate sleeved on the insulating rod and pressed on the bottom of the upper locking ring and springs tensioned between the first pressing plate and the second pressing plate, and the resistor strings A, B and C are sequentially circulated in sequence by contact piece assemblies. Preferably, the top ends of three conductive cylinders in the three groups of resistor strings are flush. Preferably, the insulating elements in the resistor string A and the resistor string C are an insulating base plate I and an insulating base plate II respectively, and the insulating elements in the resistor string B are transition plates. Preferably, the resistor components in resistor string B and resistor string C include top insulating pad three and insulating pad five, respectively. The resistor assemblies in the resistor string A and the resistor string C comprise a plurality of groups of resistor sheets and insulating base plates III which are vertically distributed side by side, the insulating base plates III are positioned between adjacent groups of resistor sheets, the top of each resistor string A is a single group of resistor sheets, the rest positions are resistor sheets of one group, the bottom of each resistor string C is a single group of resistor sheets, the rest positions are resistor sheets of one group, the resistor assemblies in the resistor string B comprise a plurality of resistor sheets and insulating base plates IV which are vertically distributed side by side, and the insulating base plates IV are in one-to-one correspondence with the resistor sheets and are positioned below the corresponding resistor sheets. Preferably, the third insulating base plate and the fourth insulating base plate are respectively provided with a boss part with an upward convex middle part and a downward convex middle part, and the middle part of the resistor disc is provided with an inner hole into which the boss part extends. Preferably, in the resistor disc of every two groups, an aluminum foil ring sleeved on the insulating rod is arranged between the two resistor discs. Preferably, the aluminum foil ring has a wave-shaped structure. Preferably, the contact piece assembly comprises a contact piece I and a plurality of contact pieces II, wherein the contact piece I and the contact piece II respectively comprise two c