Current transformer open circuit protection device

Abstract

The invention relates to the technical field of electrical devices, in particular to a current transformer open circuit protection device which comprises a substrate and an open circuit protection mechanism. The circuit break protection mechanism comprises a fixing sleeve, an iron core, a reset spring, a conductive sheet, an electromagnet and a conductive contact. The fixing sleeve is fixedly connected with the substrate, and the iron core is slidably arranged in the fixing sleeve; the conducting strip is fixedly connected with the fixing sleeve and slidably abuts against the iron core. The reset spring is arranged in the fixing sleeve, and the two ends of the reset spring are connected with the fixing sleeve and the iron core respectively. The electromagnet and the conductive contact are respectively positioned at two ends of the fixing sleeve; the secondary side of the current transformer is provided with a first wire and a second wire. The conductive contact is connected with the first wire; the conducting strip is connected with the second wire; a divider resistor is arranged on the second wire, and the electromagnet is connected with the divider resistor in parallel. When the secondary side of the current transformer is in open circuit, the iron core is in contact with the conductive contact, so that the first wire and the second wire are in short circuit, and potential safety hazards caused by open circuit are effectively avoided.

Description

Technical Field

[0001] The present application relates to the technical field of electrical devices, and in particular to a current transformer open circuit protection device. Background Art

[0002] As an important electrical measuring element, current transformers are widely used in power systems in fields such as current measurement and relay protection. In order to ensure the reliable operation of the power system, it is very important to effectively monitor the working status of the current transformer, especially for possible faults of the current transformer, such as open circuit, effective protective measures must be taken.

[0003] The current transformer realizes current conversion based on the principle of electromagnetic induction. The number of turns of its secondary winding is dozens or even hundreds of times that of the primary winding. In normal operation, the secondary magnetic flux will offset the primary magnetic flux, and the total magnetic flux is small, so the secondary circuit voltage is small; if the secondary is disconnected, the primary current is all used for excitation, which leads to oversaturation of the iron core and a sharp increase in iron loss, causing the transformer to heat up. In addition, since the number of turns of the secondary coil is dozens of times that of the primary coil, the secondary coil will induce an extremely high voltage, posing a great danger to equipment and personnel.

[0004] Therefore, how to achieve open-circuit protection of current transformers to ensure the safety of electrical equipment and personnel is one of the problems that need to be solved at present. Summary of the invention

[0005] The present application provides a current transformer open circuit protection device, which adopts the following technical solution: A current transformer open circuit protection device comprises a substrate and a circuit breaker protection mechanism; the circuit breaker protection mechanism comprises a fixed sleeve, an iron core, a reset spring, a conductive sheet, an electromagnet and a conductive contact; The fixed sleeve is fixedly connected to the base plate, and the iron core is slidably arranged in the fixed sleeve; the conductive sheet is fixedly connected to the fixed sleeve and slidably abuts against the iron core; the return spring is arranged in the fixed sleeve, and the two ends of the return spring are respectively connected to the fixed sleeve and the iron core; the electromagnet and the conductive contact are respectively located at the two ends of the fixed sleeve; The secondary side of the current transformer has a first wire and a second wire; the conductive contact is connected to the first wire; the conductive sheet is connected to the second wire; a voltage-dividing resistor is arranged on the second wire, and the electromagnet is connected in parallel with the voltage-dividing resistor; When the secondary side of the current transformer is open, the electromagnet is energized and attracts the iron core, separating the iron core from the conductive contact; when the secondary side of the current transformer is open, the magnetism of the electromagnet disappears, and the iron core contacts the conductive contact under the action of the reset spring, thereby short-circuiting the first wire and the second wire.

[0006] By adopting the above technical solution, the current transformer open circuit protection device can effectively detect the open circuit condition of the secondary side of the current transformer and realize the short circuit of the first wire and the second wire through the circuit breaker protection mechanism when the circuit is open, so as to prevent the iron core from being oversaturated and high voltage from being generated due to the open circuit of the secondary side, thereby protecting the safety of electrical equipment and personnel. Specifically, the electromagnet remains energized when the secondary side of the current transformer is in contact, and attracts the iron core to separate it from the conductive contact; when the secondary side is open, the electromagnet loses its magnetism, and the iron core contacts the conductive contact under the action of the reset spring, realizing the short circuit of the first wire and the second wire, avoiding the risk of equipment and personal safety.

[0007] Preferably, a locking mechanism is further included, the locking mechanism comprising a swing rod, a top head, a lock head and an elastic plate; a mounting seat is provided on the base plate, the middle position of the swing rod is rotatably connected to the mounting seat, the top head and the lock head are respectively located at two ends of the swing rod; the elastic plate is fixed on the mounting seat, and the swing rod is also provided with a latching tooth abutting against the elastic plate; The push rod passes through the conductive contact and extends between the conductive contact and the end of the iron core. The iron core is provided with a locking portion that cooperates with the lock head. When the iron core abuts against the conductive contact, the push rod is pushed to rotate the rocker arm, thereby connecting the lock head with the locking portion.

[0008] By adopting the above technical solution, the locking mechanism is set so that when the secondary side of the current transformer is in circuit, the iron core is attracted by the electromagnet and separated from the conductive contact. At the same time, the end of the iron core pushes the top rod to drive the rocker arm to rotate, so that the lock locks the iron core to prevent the iron core from malfunctioning due to external vibration and other reasons, effectively preventing the danger caused by secondary side circuit breaking and improving the safety of equipment and personnel.

[0009] Preferably, the locking portion is disc-shaped and is coaxially arranged with the iron core, and the periphery of the locking portion extends to the peripheral side of the iron core.

[0010] By adopting the above technical solution, the locking part is disc-shaped and coaxially arranged with the iron core, and the periphery of the locking part extends to the peripheral side of the iron core, so that it can stably cooperate with the lock head, ensuring that the locking mechanism can operate reliably when the secondary side of the current transformer is disconnected, thereby improving the safety and stability of the device.

[0011] Preferably, the conductive contact includes a circular ring and a plurality of elastic metal sheets, wherein the elastic metal sheets are located on the inner side of the circular ring and are arranged radially along the circular ring, and the plurality of elastic metal sheets are distributed divergently from the center; one end of the elastic metal sheet is fixedly connected to the circular ring, and the other end is suspended; the locking portion abuts against the elastic metal sheet.

[0012] By adopting the above technical solution, the end of the iron core can abut against the elastic metal sheet, and the elastic metal sheet will produce elastic deformation and fit tightly against the iron core, thereby ensuring the stability of the conductive connection and avoiding poor contact between the iron core and the conductive contact.

[0013] Preferably, the locking mechanism further comprises a reset lever, and the reset lever is fixedly connected to the rocker arm.

[0014] By adopting the above technical solution, the rocker arm is reset by the action of the reset lever, thereby separating the lock head on the locking rod from the locking part on the iron core, ensuring that the iron core can be smoothly separated from the conductive contact, thereby realizing the energization of the electromagnet and resetting the iron core, so as to facilitate the resetting of the circuit breaker protection mechanism, thereby enabling the current transformer open circuit protection device to be used multiple times and reducing the use cost.

[0015] Preferably, an alarm is also included, the alarm includes a power supply, a buzzer and a switch connected in series, the switch has two contacts, one of which is connected to the swing rod, and the other is fixedly connected to the mounting base; When the lock head is matched with the locking part, the two contacts of the switch are closed, and when the lock head is separated from the locking part, the two contacts of the switch are disconnected.

[0016] By adopting the above technical solution, when the secondary side of the current transformer is broken, the iron core contacts the conductive contact under the action of the reset spring, triggering the alarm to work, promptly reminding the staff to conduct inspection and maintenance, and improving safety. The additional alarm realizes the closing and opening of the switch contacts by detecting the state change of the locking mechanism, effectively monitoring and reporting the open circuit of the current transformer, and ensuring the safety of equipment and personnel.

[0017] Preferably, it further comprises a first fixing clip and a second fixing clip arranged on the substrate; the first fixing clip is used to clamp and fix the first wire, and the second fixing clip is used to clamp and fix the second wire; The first fixing clip is provided with a first metal contact for conductive contact with the first wire, and the first metal contact is electrically connected to the conductive contact; the second fixing clip is provided with a second metal contact and a third metal contact, the conductive sheet is electrically connected to the second wire through the second metal contact, and the electromagnet is electrically connected to the second wire through the third metal contact.

[0018] By adopting the above technical solution, a first fixing clip and a second fixing clip are added, thereby achieving reliable fixation of the first wire and the second wire, and improving the working stability of the entire device; the first metal contact in the first fixing clip ensures a stable electrical connection between the first wire and the conductive contact, and the second metal contact and the third metal contact in the second fixing clip respectively enable the conductive sheet and the electromagnet to reliably establish an electrical connection with the second wire.

[0019] Preferably, the second fixing clamp includes two opposing clamping plates, one of which is provided with a wire groove, and the second metal contact and the third metal contact are both located in the wire groove, and the other clamping plate is provided with a protrusion that cooperates with the wire groove, and the protrusion is used to abut against the second wire and make the second wire tightly abut against the second metal contact and the third metal contact.

[0020] By adopting the above technical solution, the second fixing clamp includes two opposite clamping plates, one of which is provided with a wire groove, and the second metal contact and the third metal contact are both located in the wire groove, and the other clamping plate is provided with a protrusion that cooperates with the wire groove, and the protrusion is used to abut against the second wire and make the second wire tightly abut against the second metal contact and the third metal contact, thereby ensuring a stable connection between the second wire and the conductive sheet and the electromagnet, and improving the reliability of the current transformer open circuit protection device.

[0021] Preferably, a spring is provided in the wire slot, and the second metal contact and the third metal contact are both fixedly connected to the spring, and under the action of the spring, the second metal contact and the third metal contact are in close contact.

[0022] By adopting the above technical solution, the second metal contact and the third metal contact can be tightly abutted under the action of the spring, thereby improving the contact reliability between the second wire and the second metal contact and the third metal contact, thereby ensuring the stability and safety of the current transformer open circuit protection device during use.

[0023] In summary, the present invention includes at least one of the following beneficial technical effects: 1. When the secondary side of the current transformer is disconnected, the magnetism of the electromagnet disappears, and the iron core contacts the conductive contact under the action of the reset spring, thereby short-circuiting the first wire and the second wire, avoiding the risk of extremely high voltage when the secondary side is disconnected, and improving the safety and reliability of the current transformer; 2. The locking mechanism can ensure that the iron core remains separated from the conductive contact when the secondary side is connected, thereby preventing misconnection and ensuring the stability and safety of the device; 3. The first fixing clip and the second fixing clip arranged on the substrate can firmly fix the first wire and the second wire, and realize accurate electrical connection through internal contacts, thereby improving the connection reliability and service life of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the overall structure of the current transformer open circuit protection device in the embodiment of the present application; Figure 2 Schematic diagram of the circuit principle of the secondary side of the current transformer and the electromagnet in the embodiment of the present application; Figure 3Schematic diagram of the overall structure of the current transformer open circuit protection device in the embodiment of the present application; Figure 4 yes Figure 3 A partial enlarged schematic diagram of part A.

[0025] Markings in the accompanying drawings: 1. substrate; 11. mounting seat; 2. circuit breaker protection mechanism; 21. fixing sleeve; 22. iron core; 221. locking part; 23. reset spring; 24. conductive sheet; 25. electromagnet; 26. conductive contact; 261. ring; 262. elastic metal sheet; 3. locking mechanism; 31. rocker; 32. top; 33. lock; 34. latch; 35. reset lever; 36. elastic plate; 361. slot; 4. alarm; 41. buzzer; 42. switch; 5. first fixing clip; 6. second fixing clip; 7. first wire; 8. second wire. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-4 The present invention is described in further detail.

[0027] The inventor of the present application discovered that an open circuit on the secondary side of a current transformer would generate high voltage, threatening equipment and personal safety. To this end, the present application mainly adopts a technical solution including a circuit breaker protection mechanism 2, thereby achieving reliable protection of the secondary side of the current transformer, reducing the potential danger caused by the open circuit, and ensuring the safety of the power system.

[0028] Reference Figure 1 The current transformer open circuit protection device provided in the embodiment of the present application includes a substrate 1 and a circuit breaker protection mechanism 2. The circuit breaker protection mechanism 2 specifically includes a fixed sleeve 21, an iron core 22, a reset spring 23, a conductive sheet 24, an electromagnet 25 and a conductive contact 26. The fixed sleeve 21 is fixedly connected to the substrate 1, and the iron core 22 is slidably arranged in the fixed sleeve 21; the conductive sheet 24 is fixedly connected to the fixed sleeve 21 and slidably abuts against the iron core 22; the reset spring 23 is arranged in the fixed sleeve 21, and its two ends are respectively connected to the fixed sleeve 21 and the iron core 22; the electromagnet 25 and the conductive contact 26 are respectively located at the two ends of the fixed sleeve 21.

[0029] Reference Figure 2 The secondary side of the current transformer has a first wire 7 and a second wire 8, a conductive contact 26 is connected to the first wire 7, and a conductive sheet 24 is connected to the second wire 8. The iron core 22 is in contact with the conductive contact 26, so that the first wire 7 and the second wire 8 are connected through the conductive sheet 24, the iron core 22, and the conductive contact 26, so that the secondary side of the current transformer is short-circuited to avoid an open circuit.

[0030] The electromagnet 25 can connect the iron core 22 with the conductive contact 26 at the moment when the secondary side of the current transformer is open. Specifically, a voltage divider resistor is provided on the second conductor 8, and the electromagnet 25 is electrically connected to the second conductor 8 and connected in parallel with the voltage divider resistor.

[0031] When the secondary side of the current transformer is in the path, the electromagnet 25 is energized and attracts the iron core 22, and at this time the iron core 22 is separated from the conductive contact 26. When the secondary side of the current transformer is open, the magnetism of the electromagnet 25 disappears, and the iron core 22 contacts the conductive contact 26 under the action of the reset spring 23, thereby short-circuiting the first wire 7 and the second wire 8. This design effectively avoids equipment overload and personal danger caused by the open circuit of the secondary side of the current transformer, and ensures the stable operation of the power system.

[0032] The substrate 1 is additionally fixed with a mounting seat 11 for fixing the conductive contact 26. The conductive contact 26 can be a metal sheet and fixedly connected to the mounting seat 11 by screws. In another embodiment, in order to ensure the stable connection between the iron core 22 and the conductive contact 26, the conductive contact 26 specifically includes a metal ring 261 and a plurality of metal elastic metal sheets 262. The metal ring 261 is fixedly connected to the mounting seat 11 and electrically connected to the second wire 8. The elastic metal sheet 262 is located inside the ring 261 and is radially arranged along the ring 261, and the plurality of elastic metal sheets 262 are centrally divergently distributed. One end of the elastic metal sheet 262 is fixedly connected to the ring 261, and the other end is suspended. The end of the iron core 22 can abut against the elastic metal sheet 262, and the elastic metal sheet 262 will produce elastic deformation so as to be close to the iron core 22, thereby ensuring the stability of the conductive connection and avoiding poor contact between the iron core 22 and the conductive contact 26.

[0033] Therefore, in the present application, the current transformer can quickly form short-circuit protection when the secondary side is open-circuited, and the entire system has a compact structure, simple operation, and is easy to install and maintain. The fixing sleeve 21, the iron core 22 and the reset spring 23 ensure that the iron core 22 can always quickly contact the conductive contact 26 when the circuit is broken, forming a reliable short-circuit protection, and having a high response speed, making the protection more timely and effective, and significantly improving the stability and safety of the power system.

[0034] In the present application, the base plate 1 , the mounting seat 11 , and the fixing sleeve 21 are all made of insulating materials such as plastic to ensure the normal operation of the circuit breaker protection mechanism 2 .

[0035] Reference Figure 3 and Figure 4The present embodiment further adds a locking mechanism 3 to improve the stability and reliability of the circuit breaker protection function. Specifically, the locking mechanism 3 includes a swing rod 31, a top head 32, a lock head 33 and an elastic plate 36. The middle position of the swing rod 31 is rotatably connected to the mounting seat 11, and the top head 32 and the lock head 33 are respectively located at both ends of the swing rod 31.

[0036] The push rod passes through the conductive contact 26 and extends between the conductive contact 26 and the end of the iron core 22. The iron core 22 is provided with a locking portion 221 that cooperates with the lock 33. When the iron core 22 abuts against the conductive contact 26 under the drive of the return spring 23, the locking portion 221 pushes the push rod to rotate the swing rod 31, so that the lock 33 moves to the side of the locking portion 221 facing away from the conductive contact 26 and abuts against the locking portion 221, thereby locking the iron core 22 and keeping the iron core 22 in a state of stable connection with the conductive contact 26. Avoid vibration or other abnormal conditions that cause the iron core 22 and the conductive contact 26 to separate or have poor contact.

[0037] The elastic plate 36 is fixed on the mounting base 11, and the rocker arm 31 is also provided with a latch tooth 34 abutting against the elastic plate 36. When the iron core 22 pushes the top rod to rotate the rocker arm 31, the tip of the latch tooth 34 pushes the elastic plate 36 to deform. As the rocker arm 31 continues to rotate, the tip of the latch tooth 34 gradually moves to one side of the elastic sheet. At this time, the elastic plate 36 recovers and abuts against the side of the latch tooth 34, thereby limiting the latch tooth 34 and the rocker arm 31. At this time, the lock head 33 abuts against the locking portion 221 and has high stability.

[0038] The elastic plate 36 is provided with two slots 361 , which are respectively located at two extreme positions of the displacement of the latching teeth 34 . The cooperation between the slots 361 and the latching teeth 34 can further improve the stability of the connection between the elastic plate 36 and the latching teeth 34 .

[0039] Furthermore, the locking portion 221 is disc-shaped and is coaxially arranged with the core 22 . The periphery of the locking portion 221 extends to the peripheral side of the core 22 to form a flange. The lock head 33 can limit the flange portion to achieve locking of the core 22 .

[0040] Furthermore, the locking mechanism 3 also includes a reset lever 35, which is fixedly connected to the rocker arm 31. When the secondary side of the current transformer is restored to a normal state, the rocker arm 31 is reversed by toggling the reset lever 35, thereby releasing the limit of the locking head 33 on the locking portion 221. At the same time, when the rocker arm 31 is toggled, the latch tooth 34 will also push the elastic plate 36 to deform. When the elastic plate 36 is deformed and restored, the elastic plate 36 can apply an elastic force to the latch tooth 34, thereby driving the push rod to push the iron core 22 to separate the iron core 22 from the conductive contact 26.

[0041] When the iron core 22 is separated from the conductive contact 26, the electromagnet 25 is energized again and then absorbs the iron core 22, so that the circuit breaker protection mechanism 2 can be reset to facilitate the next action.

[0042] Further, see Figure 4 , this embodiment also adds an alarm 4. The alarm 4 includes a power supply, a buzzer 41 and a switch 42 connected in series. The switch 42 has two contacts, one of which is connected to the swing rod 31, and the other is fixedly connected to the mounting base 11; when the iron core 22 contacts the conductive contact 26, it pushes the swing rod 31 to rotate, and connects the two contacts of the switch 42 so that the switch 42 is closed, and the buzzer 41 can sound an alarm. The swing rod 31 is reset by resetting the lever 35, and the two contacts of the switch 42 are separated, and the alarm can be released. This design further improves the safety and reliability of the system, ensuring that when the secondary side of the current transformer is open, an alarm is quickly sounded, prompting the staff to eliminate the fault in time.

[0043] In order to improve the stability of the connection between the electromagnet 25, the conductive contact and the conductive sheet 24 and the first wire 7 and the second wire 8, the current transformer open circuit protection device further includes a first fixing clamp 5 and a second fixing clamp 6 provided on the substrate 1. The first fixing clamp 5 is used to clamp and fix the first wire 7, and the second fixing clamp 6 is used to clamp and fix the second wire 8.

[0044] Specifically, the first fixing clip 5 and the second fixing clip 6 each include two clamping plates arranged opposite to each other, the clamping plates are made of plastic, one of the clamping plates is fixedly connected to the base plate 1, and the two clamping plates are detachably connected. A first metal contact is provided on the clamping plate of the first fixing clip 5, and the first metal contact is connected to the conductive contact 26. A second metal contact and a third metal contact are provided on the clamping plate of the second fixing clip 6, and the second metal contact is connected to the conductive sheet 24, and the third metal contact is connected to the electromagnet 25.

[0045] The clamping plates connecting the first fixing clamp 5 and the second fixing clamp 6 to the base are both provided with wire grooves, and the first metal contact, the second metal contact and the third metal contact are all arranged in the wire grooves. The other clamping plates of the first fixing clamp 5 and the second fixing clamp 6 are both provided with protrusions, and after the two clamping plates are connected, the protrusions match the wire grooves.

[0046] When connecting the first wire 7 and the second wire 8, if the first wire 7 and the second wire 8 are enameled wires, it is necessary to break the protective layer on the surface of the first wire 7 and the second wire 8 to expose the metal wire, place the metal wire in the wire groove, and abut the metal wire with the metal contact by the protrusion, so as to achieve the connection between the electromagnet 25, the conductive contact and the conductive sheet 24 and the first wire 7 and the second wire 8. The first fixing clamp 5 and the second fixing clamp 6 can clamp and fix the first wire 7 and the second wire 8 to ensure the stability of the two wires.

[0047] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A current transformer open circuit protection device, characterized in that: It comprises a base plate (1) and a circuit breaker protection mechanism (2); the circuit breaker protection mechanism (2) comprises a fixing sleeve (21), an iron core (22), a reset spring (23), a conductive sheet (24), an electromagnet (25) and a conductive contact (26); The fixed sleeve (21) is fixedly connected to the base plate (1), and the iron core (22) is slidably arranged in the fixed sleeve (21); the conductive sheet (24) is fixedly connected to the fixed sleeve (21) and slidably abuts against the iron core (22); the return spring (23) is arranged in the fixed sleeve (21), and the two ends of the return spring (23) are respectively connected to the fixed sleeve (21) and the iron core (22); the electromagnet (25) and the conductive contact (26) are respectively located at the two ends of the fixed sleeve (21); The secondary side of the current transformer has a first conductor (7) and a second conductor (8); the conductive contact (26) is connected to the first conductor (7); the conductive sheet (24) is connected to the second conductor (8); a voltage-dividing resistor is provided on the second conductor (8), and the electromagnet (25) is connected in parallel to the voltage-dividing resistor; When the secondary side of the current transformer is open, the electromagnet (25) is energized and attracts the iron core (22), so that the iron core (22) is separated from the conductive contact (26); when the secondary side of the current transformer is open, the magnetism of the electromagnet (25) disappears, and the iron core (22) contacts the conductive contact (26) under the action of the return spring (23), thereby short-circuiting the first conductor (7) and the second conductor (8).

2. The current transformer open circuit protection device according to claim 1, characterized in that: It also comprises a locking mechanism (3), the locking mechanism (3) comprising a swing rod (31), a top head (32), a locking head (33) and an elastic plate (36); a mounting seat (11) is provided on the base plate (1), the middle portion of the swing rod (31) is rotatably connected to the mounting seat (11), the top head (32) and the locking head (33) are respectively located at two ends of the swing rod (31); the elastic plate (36) is fixed on the mounting seat (11), and the swing rod (31) is also provided with a latching tooth (34) abutting against the elastic plate (36); The push rod passes through the conductive contact (26) and extends between the conductive contact (26) and the end of the iron core (22); the iron core (22) is provided with a locking portion (221) that cooperates with the lock head (33); when the iron core (22) abuts against the conductive contact (26), the push rod is pushed to rotate the swing rod (31), thereby connecting the lock head (33) with the locking portion (221).

3. The current transformer open circuit protection device according to claim 2, characterized in that: The locking portion (221) is disc-shaped and is arranged coaxially with the iron core (22), and the periphery of the locking portion (221) extends to the peripheral side of the iron core (22).

4. The current transformer open circuit protection device according to claim 3, characterized in that: The conductive contact (26) comprises a circular ring (261) and a plurality of elastic metal sheets (262); the elastic metal sheets (262) are located inside the circular ring (261) and are arranged radially along the circular ring (261), and the plurality of elastic metal sheets (262) are distributed divergently from the center; one end of the elastic metal sheet (262) is fixedly connected to the circular ring (261), and the other end is suspended; the locking portion (221) is in contact with the elastic metal sheet (262).

5. The current transformer open circuit protection device according to claim 2, characterized in that: The locking mechanism (3) further comprises a reset lever (35), wherein the reset lever (35) is fixedly connected to the rocker rod (31).

6. The current transformer open circuit protection device according to claim 5, characterized in that: Also included is an alarm (4), the alarm (4) comprising a power supply, a buzzer (41) and a switch (42) connected in series, the switch (42) having two contacts, one of which is connected to the reset lever (35) and the other is fixedly connected to the mounting base (11); When the lock head (33) and the locking portion (221) are matched, the two contacts of the switch (42) are closed, and when the lock head (33) and the locking portion (221) are separated, the two contacts of the switch (42) are disconnected.

7. The current transformer open circuit protection device according to claim 1, characterized in that: It also comprises a first fixing clamp (5) and a second fixing clamp (6) arranged on the substrate (1); the first fixing clamp (5) is used to clamp and fix the first wire (7), and the second fixing clamp (6) is used to clamp and fix the second wire (8); The first fixing clamp (5) is provided with a first metal contact for conductive contact with the first wire (7), and the first metal contact is electrically connected to the conductive contact (26); the second fixing clamp (6) is provided with a second metal contact and a third metal contact, the conductive sheet (24) is electrically connected to the second wire (8) via the second metal contact, and the electromagnet (25) is electrically connected to the second wire (8) via the third metal contact.

8. The current transformer open circuit protection device according to claim 7, characterized in that: The second fixing clamp (6) comprises two opposing clamping plates, one of which is provided with a wire groove, in which the second metal contact and the third metal contact are both located, and the other clamping plate is provided with a protrusion that cooperates with the wire groove, the protrusion being used to abut against the second wire (8) and to tightly abut the second wire (8) against the second metal contact and the third metal contact.

9. The current transformer open circuit protection device according to claim 8, characterized in that: A spring is arranged in the wire slot, and the second metal contact and the third metal contact are both fixedly connected to the spring. Under the action of the spring, the second metal contact and the third metal contact are in close contact.

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