CN219393145U - Open type current transformer - Google Patents

Abstract

The application relates to the technical field of power equipment, in particular to an open type current transformer, which comprises a shell, a wire and an external interface; the shell is provided with a clamping groove, one end of the wire is provided with a wire pin, and the clamping groove is matched with the wire pin; the other end of the wire is fixedly connected with the external interface. The open-type current transformer is connected with the lead pins through the clamping grooves, the other ends of the leads are connected with the external interfaces, the staff can be connected with external equipment such as relay protection, measurement and metering devices which are adapted to the external interfaces through the external interfaces, measurement and protection of the tested lines are achieved, and other installation tools are not needed when the external equipment is connected, so that the open-type current transformer is convenient and quick.

Description

Open type current transformer

Technical Field

The application relates to the technical field of power equipment, in particular to an open type current transformer.

Background

With the progress of digital electronic technology, various electronic electric energy meters and some portable electronic measuring devices are gradually popularized and used.

The current transformer consists of a closed iron core and a coil winding, wherein a primary winding is connected in series in a current line to be measured, and all current of the line always flows; the secondary winding has more turns and is connected in series in the instrument and the protection loop. The working state of the current transformer is close to short circuit, and the current transformer is used for converting primary current with larger value into secondary current with smaller value through a certain transformation ratio for measurement. The current transformer is mostly binding post or metal conducting strip, needs to be connected with other external equipment through fastening screw connecting wire when using.

In view of the above-mentioned related art, the inventors consider that the current transformer is connected to the wires of the external device by fastening screws, and the assembly and the disassembly are complicated, so that the connection of the external device is inconvenient.

Disclosure of Invention

In order to solve the problem that current transformer passes through the wire of fastening screw connection external equipment, dismouting is loaded down with trivial details, the external equipment is inconvenient to connect, this application provides an open-type current transformer.

The application provides an open-type current transformer adopts following technical scheme:

an open type current transformer comprises a shell, a wire and an external interface; the shell is provided with a clamping groove, one end of the wire is provided with a wire pin, and the clamping groove is matched with the wire pin; the other end of the wire is fixedly connected with the external interface.

Through adopting above-mentioned technical scheme, open-type current transformer passes through draw-in groove joint wire pin, and the outside interface is connected to the wire other end, and the staff accessible outside interface connection adaptation is in relay protection, measurement and the metering device of this outside interface, realizes being surveyed the survey and the protection of survey line. The wire is different from the traditional wire which is connected with external equipment through the fastening screw, is directly connected through an external interface, is convenient to operate, improves the efficiency of circuit connection, and avoids the risk of product failure caused by crimping or welding the wire.

Optionally, the shell comprises a first shell and a second shell, a buckle is arranged outside the first shell, and a clamping block is arranged outside the second shell; a clamping groove is formed in the bottom of the second shell; the first shell is rotatably connected with one end of the second shell through a rotating shaft, and the other end of the first shell connected with the second shell is connected with the clamping block through the clamping buckle.

Through adopting above-mentioned technical scheme, open-type current transformer's casing passes through pivot, buckle and fixture block and connects, and the staff can directly open the buckle when using, will be connected open-type current transformer by the wire of survey line, need not to dismantle by the wire of survey line, does not influence the normal power consumption of user, and simple to operate.

Optionally, a first arch iron core is arranged in the first shell, a second arch iron core is arranged in the second shell, and an opening is formed at the joint of the first shell and the second shell, so that the first arch iron core is attached to the second arch iron core when being connected; the second arched iron core is wound with a coil, and two ends of the coil are connected to the clamping grooves.

Through adopting above-mentioned technical scheme, set up the opening on the shell and make the iron core of open-type current transformer laminate when connecting to make the iron core closed.

Optionally, two ends of the coil are connected with resistors in parallel.

By adopting the technical scheme, the resistors are connected in parallel at the two ends of the coil, so that when measuring equipment or a line is prevented from being broken down, the output of the open-type current transformer is opened, high voltage is generated in the open-type current transformer, and internal insulation breakdown is caused, so that the open-type current transformer is damaged.

Optionally, a capacitor is connected in parallel with two ends of the coil.

By adopting the technical scheme, the capacitors are connected in parallel at the two ends of the coil, so that the output voltage is filtered, and interference is eliminated.

Optionally, the wire is a network cable wound by copper wire.

By adopting the technical scheme, the network cable formed by twisting the copper wires is excellent in manufacturing process and good in conductivity, the network cable is used as the wires, the interference of signals can be effectively reduced, and the price is favorable.

Optionally, the external interface is a crystal head.

By adopting the technical scheme, the crystal head is used as an external interface, and when the crystal head is connected with a matched socket, the original connecting structure is not required to be destroyed or interrupted, and no signal attenuation exists; the crystal head and the matched socket are connected in a reverse bayonet connection mode, so that the connection is more firm than the traditional thread and other wiring modes, and the stability of a measurement result is higher; in the process of connecting the external equipment, other installation tools are not needed, and the quick installation and use can be realized according to the installation instruction.

Optionally, the two leads in the lead form a short circuit test line, and one end of the short circuit test line far away from the external interface is electrically connected.

By adopting the technical scheme, the short-circuit test line is introduced, a user can connect the short-circuit test equipment to carry out short-circuit test on the tested line, and the applicability of the open-type current transformer is expanded.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the open type current transformer is connected with the lead pins through the clamping grooves, the other ends of the leads are connected with the external interfaces, workers can be connected with relay protection, measurement and metering devices which are adapted to the external interfaces through the external interfaces, measurement and protection of a tested line are achieved, and other installation tools are not needed when external equipment is connected, so that the open type current transformer is convenient and quick to use;

2. the casing of open-type current transformer passes through pivot, buckle and fixture block connection, and the staff can directly open the buckle when using, will be inserted open-type current transformer by the wire of survey line, need not to dismantle by the wire of survey line, does not influence the normal power consumption of user, and simple to operate.

Drawings

Fig. 1 is a schematic structural diagram of an open type current transformer according to an embodiment of the present application;

FIG. 2 is an enlarged schematic view of the area A in FIG. 1;

FIG. 3 is a schematic diagram illustrating an internal structure of an open-type current transformer according to an embodiment of the present application;

fig. 4 is a circuit diagram of an open-type current transformer according to an embodiment of the present application.

Reference numerals illustrate: 1. a housing; 2. a wire; 3. an external interface; 4. a first housing; 5. a second housing; 6. a buckle; 7. a clamping block; 8. a lead pin; 9. a rotating shaft; 10. a first arch-shaped iron core; 11. a second arch core; 12. a resistor; 13. a capacitor; 14. a short circuit test line; 15. and locking the clamping head.

Detailed Description

In order to make the technical solutions in the present specification better understood by those skilled in the art, the technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments.

Crystal head: a standardized telecommunications network interface is provided that is capable of inserting and automatically preventing a plastic tab from falling out in a fixed orientation.

The embodiment of the application discloses an open type current transformer. Referring to fig. 1, the open type current transformer includes a case 1, a wire 2, and an external interface 3; a clamping groove (not shown in the figure) is formed in the shell 1, a wire pin 8 is arranged at one end of the wire 2, and the clamping groove is matched with the wire pin 8; the other end of the lead 2 is fixedly connected with an external interface 3, and when a user uses the open-type current transformer, external equipment which is adapted to the external interface 3 is connected through the external interface 3, so that the measurement and protection of a tested line are realized.

Specifically, the wire is a network cable wound by copper wires, and the external interface is a crystal head.

Wherein, the lead 2 can be more than five types of cables and is provided with 8 leads; the external interface 3 may be an RJ45 crystal head. The super five types of cables are directly connected with the RJ45 crystal head, workers are connected with a matched external equipment socket through the RJ45 crystal head, the product failure risk brought by crimping or welding the lead 2 is avoided, and the wiring efficiency can be improved. And the price of the ultra-five types of cables and the RJ45 crystal head is low, and the grade of water resistance and dust resistance is high.

Referring to fig. 2, the RJ45 crystal head is provided with a locking chuck 15, the socket (not shown) is provided with a locking spring piece, and when the RJ45 crystal head is connected with the socket, reverse bayonet connection is performed through the locking chuck 15 and the locking spring piece. Compared with other wiring modes such as traditional threads, the anti-bayonet connection is firmer, and the stability of the measurement result is higher.

When the RJ45 crystal head is connected with a matched external equipment socket, the original connecting structure is not required to be destroyed or interrupted, signal attenuation does not exist, other installation tools are not required to be used in the process of connecting the external equipment, and the quick installation and use can be realized according to the installation instruction.

Referring to fig. 1, a housing 1 of an open type current transformer includes a first housing 4 and a second housing 5, a buckle 6 is provided outside the first housing 4, a clamping block 7 is provided outside the second housing 5, and a clamping groove is provided at the bottom of the second housing 5; one end of the first shell 4 connected with the second shell 5 is rotationally connected through a rotating shaft 9, and the other end of the first shell 4 connected with the second shell 5 is clamped with a clamping block 7 through a clamping buckle 6. When a user accesses the wire 2 of the tested line, the buckle 6 can be directly opened, the wire 2 of the tested line is accessed into the open type current transformer, the wire 2 of the tested line is not required to be disassembled, normal electricity consumption of the user is not influenced, and the installation is convenient.

Referring to fig. 1 and 3, a first arch iron core 10 is disposed inside the first housing 4, a second arch iron core 11 is disposed inside the second housing 5, and an opening is disposed at the connection position of the first housing 4 and the second housing 5, so that the first arch iron core 10 and the second arch iron core 11 are attached when connected; the second arch core 11 is wound with a coil (not shown) and both ends of the coil are connected to the clamping grooves.

Referring to fig. 4, a resistor 12 and a capacitor 13 are connected in parallel to both ends of the coil; the resistors 12 are connected in parallel at the two ends of the coil, so that when measuring equipment or a line is in fault, the output of the open type current transformer is prevented from being opened, high voltage is generated in the open type current transformer, and internal insulation breakdown is caused, so that the open type current transformer is damaged; the capacitor 13 is connected in parallel to the two ends of the coil to filter the output voltage and eliminate interference.

Referring to fig. 4, two leads in the lead 2 form a short-circuit test line 14, one end of the short-circuit test line 14, which is far away from the external interface 3, is electrically connected, and a user can connect a short-circuit test device to perform a short-circuit test on a tested line, so that the applicability of the open-type current transformer is expanded.

The rated input current of the transformer is 150A, and the turns ratio of the coil is 1:3000, the output current is thus determined to be 0.05A, the diameter of the over-five net wires is generally about 0.5mm, and the recommended value of the safe current-carrying capacity of the copper wire 2 is calculated to be 5-8 a/mm. The cross-sectional area of the copper wire with the diameter of 0.5mm is pi (0.5/2), namely (0.5/2), wherein the cross-sectional area is approximately equal to 0.196; the safe current-carrying capacity is 0.196 x 5 approximately equal to 0.98A, and 0.196 x 8 approximately equal to 1.57A. Therefore, the current which can be passed by a copper wire with the diameter of 0.5mm is about 0.98-1.57A, and the requirement of 0.05A safe operation of the transformer can be met.

The implementation principle of the embodiment is as follows: when the current transformer is used, a user opens the buckle 6 on the first shell 4, the tested line is connected to the alternating current transformer, and then the buckle 6 is buckled on the clamping block 7; external equipment such as a matched relay protection device, a matched measuring device and a matched metering device are connected through an external interface 3, so that protection and measurement of a tested line are realized.

The foregoing is merely exemplary embodiments of the present disclosure and is not intended to limit the scope of the present disclosure. That is, equivalent changes and modifications are contemplated by the teachings of this disclosure, which fall within the scope of the present disclosure. Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure in the drawings. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a scope and spirit of the disclosure being indicated by the claims.

Claims (8)

1. An open-type current transformer, characterized in that: comprises a shell (1), a wire (2) and an external interface (3); a clamping groove is formed in the shell (1), a wire pin (8) is arranged at one end of the wire (2), and the clamping groove is matched with the wire pin (8); the other end of the wire (2) is fixedly connected with the external interface (3).

2. An open-ended current transformer according to claim 1, wherein: the shell (1) comprises a first shell (4) and a second shell (5), a buckle (6) is arranged outside the first shell (4), a clamping block (7) is arranged outside the second shell (5), and a clamping groove is formed in the bottom of the second shell (5); one end of the first shell (4) connected with the second shell (5) is rotationally connected through a rotating shaft (9), and the other end of the first shell (4) connected with the second shell (5) is clamped with the clamping block (7) through the clamping buckle (6).

3. An open-ended current transformer according to claim 2, wherein: a first arched iron core (10) is arranged in the first shell (4), a second arched iron core (11) is arranged in the second shell (5), and an opening is formed in the joint of the first shell (4) and the second shell (5), so that the first arched iron core (10) is attached to the second arched iron core (11) when being connected; the second arched iron core (11) is wound with a coil, and two ends of the coil are connected to the clamping grooves.

4. An open-ended current transformer according to claim 3, wherein: the two ends of the coil are connected with a resistor (12) in parallel.

5. An open-ended current transformer according to claim 3, wherein: and two ends of the coil are also connected with a capacitor (13) in parallel.

6. An open-ended current transformer according to claim 1, wherein: the wire (2) is a network cable wound by copper wires.

7. An open-ended current transformer according to claim 1, wherein: the external interface (3) is a crystal head.

8. An open-ended current transformer according to claim 1, wherein: two leads in the lead (2) form a short circuit test line (14), and one end of the short circuit test line (14) far away from the external interface (3) is electrically connected.