Integrated circuit breaker integrated with straight-through current transformer

Abstract

The utility model relates to an integrated circuit breaker integrated with a straight-through current transformer. The integrated circuit breaker comprises a switch rack; the solid-sealed polar pole penetrates through the upper part of the switch rack, a straight-through current transformer is arranged at the joint of the solid-sealed polar pole and the switch rack, and an isolating switch rotationally connected with the solid-sealed polar pole is arranged at the end part, located at the first side of the switch rack, of the solid-sealed polar pole; the first insulator is arranged at the lower part of the first side of the switch rack and is provided with a wire inlet copper bar; the grounding switch and the wire outlet copper bar are arranged on the lower portion of the second side of the switch rack, and the grounding switch is rotationally connected with the switch rack. Compared with the prior art, the straight-through current transformer is sleeved on the solid-sealed polar pole, on one hand, the cost of the current transformer is reduced, and on the other hand, the straight-through current transformer does not need a primary conductor, is not influenced by dynamic thermal stability during short circuit and does not bear high voltage during operation, so that the installation space is reduced; and the risk of insulation failure is also reduced.

Description

Technical Field

[0001] The utility model relates to an integrated circuit breaker, in particular to an integrated circuit breaker with an integrated through-type current transformer. Background Art

[0002] In the protection configuration of the high-voltage side of transformers in terminal substations, box-type substations and ring network power supply, the new energy special integrated circuit breaker is widely used and can be used to break rated current, overload current and short-circuit current. The wind power integrated circuit breaker has the function of protecting transformer overload and preventing equipment from running in phase loss. It is especially suitable for the control and protection of ring network power supply units and terminal transformers, and is the best choice for wind turbine transmission network equipment.

[0003] At present, wind power integrated circuit breakers use pillar-type 35kV current transformers, and copper bars are used to connect the switch and the transformer. The above solution is relatively expensive, and the pillar-type current transformer needs to withstand high voltage during operation, requiring a larger installation space. Utility Model Content

[0004] The purpose of the utility model is to provide an integrated circuit breaker with an integrated through-type current transformer in order to overcome at least one of the defects of the above-mentioned prior art. The circuit breaker sets the through-type current transformer on the sealed pole, which reduces the cost of the current transformer itself on the one hand, and on the other hand, since the through-type current transformer does not require a primary conductor, it is not affected by the dynamic thermal stability during short circuit and does not withstand high voltage during operation, which reduces the installation space and the risk of insulation failure.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] An integrated circuit breaker with integrated through-type current transformer, comprising:

[0007] Switch rack;

[0008] A sealed pole penetrating the upper part of the switch frame, a through-type current transformer is provided at the connection between the sealed pole and the switch frame, and an isolating switch rotatably connected to the sealed pole is provided at the end of the sealed pole located on the first side of the switch frame;

[0009] A first insulator is arranged at the lower part of the first side of the switch frame, on which an incoming copper bar is arranged, and the isolating switch is used to be connected to the incoming copper bar;

[0010] A grounding switch and an outgoing copper busbar are arranged at the lower part of the second side of the switch frame, wherein the grounding switch is rotatably connected to the switch frame and is used to be connected to the outgoing copper busbar;

[0011] When the primary circuit is turned on, the disconnector is closed, the sealed pole is closed, and the earthing switch is opened. The primary current flows through the bushing at the disconnector and is converted into secondary current through the through-type current transformer and connected to the protection device or measuring device to achieve circuit protection and current measurement.

[0012] Furthermore, an operating mechanism is provided on the side of the switch rack, and the isolating switch and the grounding switch move synchronously through the operating mechanism.

[0013] Furthermore, the operating mechanism is provided with an electromagnetic lock and a cabinet door interlock.

[0014] Furthermore, the circuit breaker is also provided with an isolating pull rod, one end of which is connected to the middle of the isolating switch, and the other end of which is connected to the switch frame.

[0015] Furthermore, a main shaft push-pull rod is provided between the end of the sealed pole located on the second side of the switch frame and the switch frame.

[0016] Furthermore, the through-type current transformer is sleeved on the outer wall surface of the sealed pole.

[0017] Furthermore, a second insulator is provided at the lower portion of the second side of the switch rack; and the outgoing copper bar is installed at the end of the second insulator.

[0018] Furthermore, the integrated circuit breaker also includes a connecting copper bar, which is arranged at the end of the sealed pole located on the second side of the switch frame; the outgoing copper bar abuts against the connecting copper bar.

[0019] Furthermore, the protection device is a microcomputer protection device.

[0020] Furthermore, the measuring device is an ammeter.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] (1) The utility model provides an integrated circuit breaker with an integrated through-type current transformer. The circuit breaker mounts the through-type current transformer on a sealed pole. On the one hand, the cost of the current transformer itself is reduced. On the other hand, since the through-type current transformer does not require a primary conductor, it is not affected by dynamic thermal stability during short circuit and does not withstand high voltage during operation, which reduces the installation space and the risk of insulation failure.

[0023] (2) The utility model provides an integrated circuit breaker with an integrated through-type current transformer. The circuit breaker adopts a through-type current transformer, and the overall size of the switch is smaller and the weight is lighter; BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1This is one of the schematic diagrams of an integrated circuit breaker with integrated through-type current transformer in the embodiment;

[0025] Figure 2 This is a second schematic diagram of an integrated circuit breaker with integrated through-type current transformer in an embodiment;

[0026] As shown in the figure: 1-incoming copper busbar; 2-isolating switch; 3-sealed pole; 4-through-type current transformer; 5-switch rack; 6-spindle push-pull rod; 7-; 8-connecting copper busbar; 9-electromagnetic lock; 10-cabinet door interlock; 11-grounding switch; 12-outgoing copper busbar; 13-first insulator; 14-second insulator; 15-isolating pull rod. DETAILED DESCRIPTION

[0027] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0028] Example

[0029] See also Figure 1 , 2 This embodiment provides an integrated circuit breaker with an integrated through-type current transformer, including:

[0030] Switch rack 5;

[0031] A sealed pole 3 passes through the upper part of the switch frame 5, a through-type current transformer 4 is provided at the connection between the sealed pole 3 and the switch frame 5, and an isolating switch 2 rotatably connected thereto is provided at the end of the sealed pole 3 located on the first side of the switch frame 5. Specifically, the through-type current transformer 4 is sleeved on the outer wall surface of the sealed pole 3;

[0032] A first insulator 13 is arranged at the lower part of the first side of the switch frame 5, on which an incoming copper bar 1 is arranged, and the disconnector 2 is used to be connected to the incoming copper bar 1;

[0033] A grounding switch 11 and an outgoing copper busbar 12 are arranged at the lower part of the second side of the switch frame 5, wherein the grounding switch 11 is rotatably connected to the switch frame 5 and is used to be connected to the outgoing copper busbar 12;

[0034] When the primary circuit is turned on, the isolating switch 2 is closed, the sealed pole 3 is closed, and the grounding switch 11 is opened. The primary current flows through the bushing at the isolating switch 2, and is converted into a secondary current through the through-type current transformer 4 and connected to the protection device or measurement device to realize circuit protection and current measurement.

[0035] Please refer to Figure 1 , 2In this embodiment, an operating mechanism 7 is further provided on the side of the switch frame 5, and the isolating switch 2 and the grounding switch 11 move synchronously through the operating mechanism 7. The operating mechanism 7 can realize the simultaneous rotation of the grounding switch 11 and the isolating switch 2, so that the grounding switch 11 must be opened when the isolating switch 2 is closed, and the isolating switch must be opened when the grounding switch 11 is closed, so as to achieve the interlocking of the isolating switch 2 and the grounding switch 11.

[0036] The operating mechanism 7 is also provided with an electromagnetic lock 9 and a cabinet door interlock 10. Specifically, the electromagnetic lock 9 is installed on the surface of the operating mechanism 7; the cabinet door interlock 10 is installed on one side of the operating mechanism 7, which can realize the interlocking of the grounding switch 11 and the cabinet door of the high-voltage room of the box transformer, that is, the operating key can only be inserted into the grounding operating hole when the cabinet door is closed, and the cabinet door cannot be opened without the grounding switch 11 being closed.

[0037] Please refer to Figure 1 , 2 In this embodiment, the circuit breaker is further provided with an isolating pull rod 15, one end of which is connected to the middle of the isolating switch 2, and the other end is connected to the switch frame 5. A main shaft push-pull rod 6 is provided between the end of the sealed pole 3 located on the second side of the switch frame 5 and the switch frame 5.

[0038] Please refer to Figure 1 , 2 In this embodiment, the integrated circuit breaker further includes a connecting copper bar 8, which is arranged at the end of the sealed pole 3 located on the second side of the switch frame 5; the outgoing copper bar 12 is in contact with the connecting copper bar 8.

[0039] In this embodiment, the protection device is a microcomputer protection device; and the measuring device is an ammeter.

[0040] Working principle:

[0041] The integrated circuit breaker provided in this embodiment is installed in the high-voltage room of the box-type substation, the grounding switch 11 is in the open state, and the isolating switch 2 is in the closed state. At this time, the through-type CT integrated circuit breaker is in the power supply position, and the circuit has voltage so that the electromagnetic lock 9 is in the locked state, ensuring that the grounding knife 11 cannot be closed; one of the five high-voltage protections is achieved to prevent live electricity from accidentally entering the live compartment.

[0042] Power transmission process:

[0043] The incoming copper bar 1 receives the high-voltage current at the line end, passes through the isolating switch 2 and the sealed pole 3 installed on the switch rack 5, and the entire sealed pole 3 is turned on by closing the circuit breaker, and then connected to the connecting copper bar 8 and the outgoing copper bar 12 to connect the rear transformer to complete the power transmission project. When the current flows through the sealed pole 3, the current transformer 4 can sense the output secondary current, which is connected to the external protection device to realize the protection and measurement functions of the circuit.

[0044] Power off process:

[0045] The through-type CT integrated circuit breaker is in the open state by operating the operating mechanism 7, the connecting copper bar 8 and the outgoing copper bar 12 are without voltage, the coil of the electromagnetic lock 9 is energized, and the electromagnetic lock 9 can be opened. The operating mechanism 7 is rotated by the operating handle to drive the isolating knife 2 to open, and the grounding knife 11 is closed to complete the power-off process. After the grounding knife 11 is closed, the cabinet door interlock 10 can be opened to release the cabinet door lock.

[0046] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. An integrated circuit breaker with integrated through-type current transformer, characterized in that: include: Switch rack (5); A sealed pole (3) passing through the upper part of the switch frame (5), a through-type current transformer (4) being arranged at the connection between the sealed pole (3) and the switch frame (5), and an isolating switch (2) rotatably connected thereto being arranged at the end of the sealed pole (3) located on the first side of the switch frame (5); A first insulator (13) arranged at the lower part of the first side of the switch frame (5), on which an incoming copper bar (1) is arranged, and the disconnector (2) is used to be connected to the incoming copper bar (1); A grounding switch (11) and an outgoing copper busbar (12) are arranged at the lower part of the second side of the switch frame (5), wherein the grounding switch (11) is rotatably connected to the switch frame (5) and is used to be connected to the outgoing copper busbar (12); When the primary circuit is turned on, the isolating switch (2) is closed, the sealed pole (3) is closed, the grounding switch (11) is opened, the primary current flows through the bushing at the isolating switch (2), and is converted into a secondary current through the through-type current transformer (4) and connected to a protection device or a measurement device, thereby realizing circuit protection and current measurement.

2. The integrated circuit breaker with integrated through-type current transformer according to claim 1, characterized in that: An operating mechanism (7) is also provided on the side of the switch frame (5), and the isolating switch (2) and the grounding switch (11) move synchronously via the operating mechanism (7).

3. The integrated circuit breaker with integrated through-type current transformer according to claim 2, characterized in that: The operating mechanism (7) is provided with an electromagnetic lock (9) and a cabinet door interlock (10).

4. The integrated circuit breaker with integrated through-type current transformer according to claim 1, characterized in that: The circuit breaker is also provided with an isolating pull rod (15), one end of which is connected to the middle of the isolating switch (2), and the other end of which is connected to the switch frame (5).

5. The integrated circuit breaker with integrated through-type current transformer according to claim 1, characterized in that: A main shaft push-pull rod (6) is provided between the end of the sealed pole (3) located on the second side of the switch frame (5) and the switch frame (5).

6. The integrated circuit breaker with integrated through-type current transformer according to claim 1, characterized in that: The through-type current transformer (4) is sleeved on the outer wall surface of the sealed pole (3).

7. The integrated circuit breaker with integrated through-type current transformer according to claim 1, characterized in that: A second insulator (14) is also provided at the lower part of the second side of the switch frame (5); the outlet copper bar (12) is installed at the end of the second insulator (14).

8. The integrated circuit breaker with integrated through-type current transformer according to claim 7, characterized in that: The integrated circuit breaker further comprises a connecting copper bar (8), which is arranged at the end of the sealed pole (3) located on the second side of the switch frame (5); the outgoing copper bar (12) is in abutment with the connecting copper bar (8).

9. The integrated circuit breaker with integrated through-type current transformer according to claim 1, characterized in that: The protection device is a microcomputer protection device.

10. The integrated circuit breaker with integrated through-type current transformer according to claim 1, characterized in that: The measuring device is an ammeter.

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