A 10KV Circuit Breaker Quick Tripping Device and Implementation Method

Abstract

The present invention adopts a fast-breaking device for a 10KV circuit breaker, which includes an incoming line branch, an outgoing line branch, a first capacitor, a second capacitor and a 10KV circuit breaker. The incoming line branch is arranged on the incoming line side of the 10KV circuit breaker and is electrically connected to both ends of the first capacitor. The outgoing line branch is arranged on the outgoing line side of the 10KV circuit breaker and is electrically connected to both ends of the second capacitor. Self-assistance is introduced into the opening process of the incoming and outgoing line contacts of the 10KV circuit breaker, and the DC large current generating the self-assistance does not pass through the incoming and outgoing line contacts of the 10KV circuit breaker, but only plays a role in assisting fast breaking.

Description

Technical Field

[0001] The present invention relates to the field of circuit technologies, and in particular to a 10KV circuit breaker rapid breaking device and implementation method. Background Art

[0002] When a fault occurs in the power system, if the short-circuit current cannot be restricted within the range that high-voltage equipment can withstand and is quickly cut off, it will cause the explosion of the high-voltage circuit breaker, further expand the accident, and even cause damage to the generator set, with the recovery time being infinitely extended, seriously affecting the operation efficiency of the unit.

[0003] The self-opening time of the existing 10KV circuit breaker is more than 30 milliseconds, and the short-circuit current of the power system reaches its peak value in 10 milliseconds. Therefore, there is no way to cut off the circuit before the short-circuit current reaches its peak value, and the normal operation of the power grid cannot be guaranteed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that: the self-opening time of the existing 10KV circuit breaker is more than 30 milliseconds, and the short-circuit current of the power system reaches its peak value in 10 milliseconds. Therefore, there is no way to cut off the circuit before the short-circuit current reaches its peak value, and the normal operation of the power grid cannot be guaranteed.

[0005] To solve the above technical problem, the technical solution adopted by the present invention is as follows:

[0006] The present invention adopts a 10KV circuit breaker rapid breaking device, including an incoming line branch, an outgoing line branch, a first capacitor, a second capacitor and a 10KV circuit breaker. The incoming line branch is arranged on the incoming line side of the 10KV circuit breaker and is electrically connected to both ends of the first capacitor. The outgoing line branch is arranged on the outgoing line side of the 10KV circuit breaker and is electrically connected to both ends of the second capacitor.

[0007] Further, the incoming line branch includes an incoming line reactance transformer, a first rectifier, a first current-limiting resistor, and a first DC relay. One side of the incoming line reactance transformer is electrically connected to one side of the first rectifier. The other side of the first rectifier is electrically connected to one side of the first current-limiting resistor. The other side of the first current-limiting resistor is electrically connected to the first DC relay and the first capacitor. The other side of the first DC relay is electrically connected to the incoming line side of the 10KV circuit breaker and the first capacitor.

[0008] Further, the incoming line branch further includes a first diode group. One side of the first diode group is electrically connected to the first capacitor and the first DC relay, and the other side is connected to the incoming line reactance transformer and the incoming line side of the 10KV circuit breaker.

[0009] Further, the outgoing line branch includes an outgoing line reactance transformer, a second rectifier, a second current-limiting resistor, and a second DC relay. One side of the outgoing line reactance transformer is electrically connected to one side of the second rectifier. The other side of the second rectifier is electrically connected to one side of the second current-limiting resistor. The other side of the second current-limiting resistor is electrically connected to the second DC relay and a second capacitor. The other side of the second DC relay is electrically connected to the outgoing line side of the 10KV circuit breaker and the second capacitor.

[0010] Further, the outgoing line branch further includes a second diode group. One side of the second diode group is electrically connected to the second capacitor and the second DC relay, and the other side is connected to the outgoing line reactance transformer and the outgoing line side of the 10KV circuit breaker.

[0011] Further, the connection directions of the first capacitor and the first diode group are opposite to those of the second capacitor and the second diode group.

[0012] A method for quickly breaking a 10KV circuit breaker is also provided, including the 10KV circuit breaker quick-breaking device as described above.

[0013] When there is no short-circuit current flowing through the 10KV circuit breaker, the circuit is in a normal working state.

[0014] When there is a short-circuit current flowing through the 10KV circuit breaker, the circuit is in a short-circuit state. At this time, the output voltage of the incoming line reactance transformer increases, the output voltage of the first rectifier increases, the first DC relay operates, closes the contacts of the first DC relay, and the first capacitor discharges to the incoming line side of the 10KV circuit breaker. A large DC current flowing from top to bottom flows through the contacts on the incoming line side of the 10KV circuit breaker.

[0015] Similarly, a large DC current flowing from bottom to top flows through the contacts on the outgoing line side of the 10KV circuit breaker, realizing quick breaking.

[0016] The beneficial effects of the present invention are as follows: The present invention adopts a 10KV circuit breaker quick-breaking device, including an incoming line branch, an outgoing line branch, a first capacitor, a second capacitor, and a 10KV circuit breaker. The incoming line branch is arranged on the incoming line side of the 10KV circuit breaker and is electrically connected to both ends of the first capacitor. The outgoing line branch is arranged on the outgoing line side of the 10KV circuit breaker and is electrically connected to both ends of the second capacitor. Self-assist force is introduced into the opening process of the incoming and outgoing contacts of the 10KV circuit breaker, and the large DC current generating the self-assist force does not pass through the incoming and outgoing contacts of the 10KV circuit breaker, but only plays a role in assisting quick breaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The specific structure of the present invention will be described in detail below with reference to the drawings.

[0018] Figure 1This is a schematic diagram of the principle structure of the present invention. Detailed implementation manners

[0019] To describe in detail the technical content, structural features, achieved objectives and effects of the present invention, the following will be described in detail in conjunction with the implementation manners and with reference to the drawings.

[0020] Please refer to Figure 1 , the present invention adopts a fast breaking device for a 10KV circuit breaker, which includes an incoming line branch, an outgoing line branch, a first capacitor 1, a second capacitor 2 and a 10KV circuit breaker 3. The incoming line branch is arranged on the incoming line side 301 of the 10KV circuit breaker and is electrically connected to both ends of the first capacitor 1. The outgoing line branch is arranged on the outgoing line side 302 of the 10KV circuit breaker and is electrically connected to both ends of the second capacitor 2.

[0021] Further, the incoming line branch includes an incoming line reactance transformer 4, a first rectifier 5, a first current limiting resistor 6, and a first DC relay 7. One side of the incoming line reactance transformer 4 is electrically connected to one side of the first rectifier 5. The other side of the first rectifier 5 is electrically connected to one side of the first current limiting resistor 6. The other side of the first current limiting resistor 6 is electrically connected to the first DC relay 7 and the first capacitor 1. The other side of the first DC relay 7 is electrically connected to the incoming line side 301 of the 10KV circuit breaker and the first capacitor 1.

[0022] Further, the incoming line branch further includes a first diode group 8. One side of the first diode group 8 is electrically connected to the first capacitor 1 and the first DC relay 7, and the other side is connected to the incoming line reactance transformer 4 and the incoming line side 301 of the 10KV circuit breaker.

[0023] Further, the outgoing line branch includes an outgoing line reactance transformer 9, a second rectifier 10, a second current limiting resistor 11, and a second DC relay 12. One side of the outgoing line reactance transformer 9 is electrically connected to one side of the second rectifier 10. The other side of the second rectifier 10 is electrically connected to one side of the second current limiting resistor 11. The other side of the second current limiting resistor 11 is electrically connected to the second DC relay 12 and the second capacitor 2. The other side of the second DC relay 12 is electrically connected to the outgoing line side 301 of the 10KV circuit breaker and the second capacitor 2.

[0024] Further, the outgoing line branch further includes a second diode group 13. One side of the second diode group 13 is electrically connected to the second capacitor 2 and the second DC relay 12, and the other side is connected to the outgoing line reactance transformer 9 and the outgoing line side 301 of the 10KV circuit breaker.

[0025] Further, the connection directions of the first capacitor 1, the first diode group 8 and the second capacitor 2, the second diode group 13 are opposite.

[0026] The specific working principle is as follows: During normal operation, the incoming line reactance transformer 4 converts the alternating current into a direct current voltage through the first rectifier 5 and charges the first capacitor 1 through the first current-limiting resistor 6. Since the alternating current flowing through the 10KV circuit breaker 3 is small during normal operation, the direct current voltage output by the first rectifier 5 is low, and the first direct current relay 7 will not be activated.

[0027] When a short-circuit fault occurs, when the short-circuit current flows through the 10KV circuit breaker 3, the incoming line reactance transformer 4 also has a short-circuit current flowing through it, and its output voltage increases. The direct current voltage output by the connected first rectifier 5 also increases. At this time, the first direct current relay 7 operates, and the contact 701 of the first direct current relay closes. The first capacitor 1 discharges to the incoming line side 301 of the 10KV circuit breaker, and a large direct current flows through the incoming line contact of the 10KV circuit breaker from top to bottom; similarly, a large direct current flows through the outgoing line contact of the 10KV circuit breaker from bottom to top; these two large direct currents flow in opposite directions. The incoming and outgoing line contacts of the 10KV circuit breaker generate electrodynamic forces in opposite directions under the action of these two large direct currents flowing in opposite directions. Therefore, the incoming and outgoing line contacts of the 10KV circuit breaker are quickly disconnected under the combined action of these two self-acting forces in opposite directions and the short-circuit current.

[0028] The self-acting force of the present invention is generated by the discharge of the first capacitor 1 and the second capacitor 2, and has the characteristics of clear physical concept, high reliability and strong practicability. By introducing the self-acting force into the opening process of the incoming and outgoing line contacts of the 10KV circuit breaker, and the large direct current generating the self-acting force does not pass through the incoming and outgoing line contacts of the 10KV circuit breaker, but only plays a role in assisting the quick disconnection; among them, the function of the first diode group 8 and the second diode group 13 is to ensure that when the first capacitor 1 and the second capacitor 2 are charged, the charging will not be short-circuited by the 10KV circuit breaker contact circuit, resulting in the situation that the charging cannot be completed; the connection directions of the first capacitor 1, the first diode group 8 and the second capacitor 2, the second diode group 13 are opposite to ensure that the self-help currents passing through the two contacts of the 10KV circuit breaker 3 are opposite.

[0029] A method for quickly disconnecting a 10KV circuit breaker is also provided, including the 10KV circuit breaker quick disconnection device as described above.

[0030] When no short-circuit current flows through the 10KV circuit breaker 3, the circuit is in a normal working state.

[0031] When a short-circuit current flows through the 10KV circuit breaker 3, the circuit is in a short-circuit state. At this time, the output voltage of the incoming line reactance transformer 4 increases, the output voltage of the first rectifier 5 increases, the first direct current relay 7 operates, closes the contact of the first direct current relay 701, the first capacitor 1 discharges to the incoming line side 301 of the 10KV circuit breaker, and a large direct current flows through the contact of the incoming line side 301 of the 10KV circuit breaker from top to bottom.

[0032] Similarly, the contact of the outgoing line side 302 of the 10KV circuit breaker conducts a large DC current flowing from bottom to top to achieve rapid breaking.

[0033] In summary, for the 10KV circuit breaker rapid breaking device and implementation method provided by the present invention, the self-assist force of the present invention is generated by the discharge of the first capacitor and the second capacitor, and has the characteristics of clear physical concept, high reliability and strong practicability. By introducing the self-assist force into the opening process of the incoming and outgoing contacts of the 10KV circuit breaker, and the large DC current generating the self-assist force does not pass through the incoming and outgoing contacts of the 10KV circuit breaker, but only plays a role in assisting rapid breaking; among them, the role of the first diode group and the second diode group is to ensure that when the first capacitor and the second capacitor are charged, the charging will not be short-circuited by the 10KV circuit breaker contact circuit, resulting in the situation that the charging cannot be completed; the connection directions of the first capacitor, the first diode group and the second capacitor, the second diode group are opposite to ensure that the self-help currents passing through the two contacts of the 10KV circuit breaker are opposite.

[0034] Here, the first, the second... only represent the distinction of their names, and do not represent any differences in their importance and positions.

[0035] Here, up, down, left, right, front and back only represent their relative positions and do not represent their absolute positions.

[0036] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are similarly included in the patent protection scope of the present invention.

Claims

1. A 10KV circuit breaker rapid opening device, characterized in that: It includes an incoming line branch, an outgoing line branch, a first capacitor, a second capacitor and a 10KV circuit breaker. The incoming line branch is arranged on the incoming line side of the 10KV circuit breaker and is electrically connected to both ends of the first capacitor. The outgoing line branch is arranged on the outgoing line side of the 10KV circuit breaker and is electrically connected to both ends of the second capacitor; The incoming line branch includes an incoming line reactance transformer, a first rectifier, a first current-limiting resistor, and a first DC relay. One side of the incoming line reactance transformer is electrically connected to one side of the first rectifier. The other side of the first rectifier is electrically connected to one side of the first current-limiting resistor. The other side of the first current-limiting resistor is electrically connected to the first DC relay and the first capacitor. The other side of the first DC relay is electrically connected to the incoming line side of the 10KV circuit breaker and the first capacitor; The outgoing line branch includes an outgoing line reactance transformer, a second rectifier, a second current-limiting resistor, and a second DC relay. One side of the outgoing line reactance transformer is electrically connected to one side of the second rectifier. The other side of the second rectifier is electrically connected to one side of the second current-limiting resistor. The other side of the second current-limiting resistor is electrically connected to the second DC relay and the second capacitor. The other side of the second DC relay is electrically connected to the outgoing line side of the 10KV circuit breaker and the second capacitor; When there is a short-circuit fault, the incoming and outgoing line contacts of the 10KV circuit breaker generate electrodynamic forces in opposite directions under the action of two DC large currents in opposite directions. The incoming and outgoing line contacts of the 10KV circuit breaker are quickly disconnected under the combined action of these two self-acting forces in opposite directions and the short-circuit current.

2. The quick-breaking device for a 10KV circuit breaker according to claim 1, wherein: The incoming line branch further includes a first diode group. One side of the first diode group is electrically connected to the first capacitor and the first DC relay, and the other side is connected to the incoming line reactance transformer and the incoming line side of the 10KV circuit breaker.

3. The 10KV circuit breaker rapid opening device according to claim 2, characterized in that: The outgoing line branch further includes a second diode group. One side of the second diode group is electrically connected to the second capacitor and the second DC relay, and the other side is connected to the outgoing line reactance transformer and the outgoing line side of the 10KV circuit breaker.

4. The 10KV circuit breaker rapid opening device according to claim 3, characterized in that: The connection directions of the first capacitor, the first diode group and the second capacitor, the second diode group are opposite.

5. A method for quickly disconnecting a 10KV circuit breaker, which is applied to the 10KV circuit breaker quick-disconnection device according to any one of the above claims 1 to 4, and is characterized in that: When no short-circuit current flows through the 10KV circuit breaker, the circuit is in a normal working state; When a short-circuit current flows through the 10KV circuit breaker, the circuit is in a short-circuit state. At this time, the output voltage of the incoming line reactance transformer increases, the output voltage of the first rectifier increases, the first DC relay operates, closes the contacts of the first DC relay, and the first capacitor discharges to the incoming line side of the 10KV circuit breaker. The contact on the incoming line side of the 10KV circuit breaker passes through a large DC current from top to bottom; Similarly, the contact on the outgoing line side of the 10KV circuit breaker passes through a large DC current from bottom to top, realizing quick disconnection.

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