IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0629917
(2009-12-03)
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| 등록번호 |
US-8331066
(2012-12-11)
|
|
발명자
/ 주소 |
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| 출원인 / 주소 |
- Cooper Technologies Company
|
| 대리인 / 주소 |
|
| 인용정보 |
피인용 횟수 :
0 인용 특허 :
56 |
초록
▼
A circuit breaker for a transformer includes means for interrupting circuitry in the transformer upon a fault condition in the transformer (the “fault interruption means”). The circuit breaker also includes means for interrupting the circuitry when a level of dielectric fluid in a tank of the transf
A circuit breaker for a transformer includes means for interrupting circuitry in the transformer upon a fault condition in the transformer (the “fault interruption means”). The circuit breaker also includes means for interrupting the circuitry when a level of dielectric fluid in a tank of the transformer is unacceptably low (the “low oil trip means”). The fault interruption means includes a magnet, metal element, and first actuator. Upon the fault condition, the magnet and metal element separate, moving the first actuator to cause the electrical circuitry to open. The low oil trip means includes a float, insulating rod, and second actuator. When the dielectric fluid level drops to an unacceptably low level, the float and insulating rod drop, moving the second actuator to cause the circuitry to open. The low oil trip means operates independently of the fault interruption means, opening the circuitry without separating the magnet and metal element.
대표청구항
▼
1. A circuit breaker for a transformer, comprising: a tripping apparatus that moves a movable contact relative to a stationary contact to open and close a circuit, wherein the tripping apparatus comprises a first lever arm coupled to the movable contact and a second lever arm coupled to a rod, where
1. A circuit breaker for a transformer, comprising: a tripping apparatus that moves a movable contact relative to a stationary contact to open and close a circuit, wherein the tripping apparatus comprises a first lever arm coupled to the movable contact and a second lever arm coupled to a rod, wherein the rod is detachably coupled to the first lever arm such that when the rod is detached from the first lever arm, the first lever arm descends moving the movable contact;fault interrupting means for causing the tripping apparatus to move the movable contact upon a fault condition in the transformer; andlow oil trip means for causing the tripping apparatus to move the movable contact when a level of dielectric fluid in a tank of the transformer is below a threshold level,wherein the low oil trip means operates independently of the fault interrupting means to open the circuit without actuating any components of the fault interrupting means. 2. The circuit breaker of claim 1, wherein the fault interrupting means comprises: a magnet; anda curie metal element electrically coupled to the circuit and configured to release a magnetic coupling between the magnet and the curie metal element to open the circuit upon the fault condition,wherein the low oil trip means causes the circuit to open without releasing the magnetic coupling between the magnet and the curie metal element. 3. The circuit breaker of claim 2, wherein the fault interrupting means further comprises an actuator coupled to the magnet and configured to move in conjunction with the magnet, wherein release of the magnetic coupling between the magnet and the curie metal element moves the actuator to cause the circuit to open. 4. The circuit breaker of claim 1, wherein the low oil trip means comprises: a float member configured to float in the dielectric fluid;a low oil rod coupled to the float member; andwherein the float member is configured to apply a force to the low oil rod to actuate the second lever arm when the level of dielectric fluid in the tank recedes below the threshold level, actuation of the second lever arm causing the circuit to open. 5. The circuit breaker of claim 1, wherein the tripping means comprises a spring-biased cam coupled to the second lever arm, movement of the spring-biased cam causing the first lever arm to move the movable contact relative to the stationary contact. 6. The circuit breaker of claim 5, wherein the low oil trip means comprises a lever that releases the spring-biased cam to cause the circuit to open. 7. The circuit breaker of claim 6, wherein the fault interrupting means actuates an actuator to release the spring-biased cam to cause the circuit to open. 8. A circuit breaker for a transformer, comprising: a stationary contact configured to be electrically coupled to a circuit of a transformer;a movable contact;a tripping apparatus that moves the movable contact relative to the stationary contact to open and close the circuit, wherein the tripping apparatus comprises a first lever arm coupled to the movable contact and a second lever arm coupled to a rod, wherein the rod is detachably coupled to the first lever arm such that when the rod is detached from the first lever arm, the first lever arm descends moving the movable contact;a fault interrupting apparatus that causes the tripping apparatus to open the circuit upon a fault condition in the transformer; anda low oil trip apparatus that causes the tripping apparatus to open the circuit when a level of dielectric fluid in a tank of the transformer is below a threshold level,wherein the low oil trip apparatus operates independently of the fault interrupting apparatus to open the circuit without actuating any components of the fault interrupting apparatus. 9. The circuit breaker of claim 8, wherein the fault interrupting apparatus comprises: a magnet; anda curie metal element electrically coupled to the circuit and configured to release a magnetic coupling between the magnet and the curie metal element upon the fault condition,wherein the low oil trip apparatus causes the circuit to open without releasing the magnetic coupling between the magnet and the curie metal element. 10. The circuit breaker of claim 9, wherein the fault interrupting apparatus further comprises an actuator coupled to the magnet and configured to move in conjunction with the magnet, wherein release of the magnetic coupling between the magnet and the curie metal element moves the actuator to cause the tripping apparatus to open the circuit. 11. The circuit breaker of claim 8, wherein the low oil trip apparatus comprises: a float member configured to float in the dielectric fluid;a low oil rod coupled to the float member; andwherein the float member is configured to apply a force to the low oil rod to actuate the second lever arm when the level of dielectric fluid in the tank recedes below the threshold level, actuation of the second lever arm causing the tripping apparatus to open the circuit. 12. The circuit breaker of claim 8, wherein the tripping apparatus comprises a spring-biased cam coupled to the second lever arm , movement of the spring-biased cam causing the first lever arm to move the movable contact relative to the stationary contact. 13. The circuit breaker of claim 12, wherein the low oil trip apparatus comprises a lever that releases the spring-biased cam to cause the circuit to open. 14. The circuit breaker of claim 13, wherein the fault interrupting apparatus actuates an actuator to release the spring-biased cam to cause the circuit to open. 15. A circuit breaker assembly for a transformer, comprising: a plurality of circuit breakers, each circuit breaker comprising: a tripping apparatus that moves a movable contact relative to a stationary contact to open and close a circuit, wherein the tripping apparatus comprises a first lever arm coupled to the movable contact and a second lever arm coupled to a rod, wherein the rod is detachably coupled to the first lever arm such that when the rod is detached from the first lever arm, the first lever arm descends moving the movable contact;a fault interrupting means for causing the tripping apparatus to move the movable contact to open upon a fault condition in the transformer, andlow oil trip means for causing the tripping apparatus to move the movable contact to open when a level of dielectric fluid in a tank of the transformer is below a threshold level,wherein the low oil trip means operates independently of the fault interrupting means to open the circuit without actuating any components of the fault interrupting means; anda linkage bar coupled to each of the circuit breakers, the linkage bar rotating in response to the fault interrupting means of one of the circuit breakers causing the circuit associated with the one of the circuit breakers to open, the rotating of the linkage bar causing the fault interrupting means of each other circuit breaker to open the circuit associated with the other circuit breaker. 16. The circuit breaker assembly of claim 15, wherein the circuit breaker assembly comprises three circuit breakers, each circuit breaker being associated with a different phase of three phase power in the transformer. 17. The circuit breaker assembly of claim 15, wherein the fault interrupting means of each circuit breaker comprises: a magnet; anda curie metal element electrically coupled to the circuit associated with the circuit breaker and configured to release a magnetic coupling between the magnet and the curie metal element to open the circuit associated with the circuit breaker upon the fault condition,wherein the low oil trip means causes the circuit associated with the circuit breaker to open without releasing the magnetic coupling between the magnet and the curie metal element. 18. A method for protecting a circuit of a transformer, comprising the steps of: determining whether a fault condition exists in a transformer;in response to determining that a fault condition exists in the transformer, releasing a magnetic coupling to cause a tripping apparatus to open the circuit in the transformer;determining whether a level of dielectric fluid in a tank of the transformer is below a threshold level; andin response to determining that the level of dielectric fluid is below the threshold level, causing the tripping apparatus to open the circuit in the transformer without releasing the magnetic coupling,wherein the tripping apparatus moves a movable contact relative to a stationary contact to open and close the circuit, wherein the tripping apparatus comprises a first lever arm coupled to the movable contact and a second lever arm coupled to a rod, wherein the rod is detachably coupled to the first lever arm such that when the rod is detached from the first lever arm, the first lever arm descends moving the movable contact.
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