CN219303467U

CN219303467U - Secondary short circuit indicating device of current transformer

Info

Publication number: CN219303467U
Application number: CN202222918486.XU
Authority: CN
Inventors: 蒋大维; 袁芬
Original assignee: Jiangyin Spark Electronic Technology Co ltd
Current assignee: Jiangyin Spark Electronic Technology Co ltd
Priority date: 2022-11-01
Filing date: 2022-11-01
Publication date: 2023-07-04
Anticipated expiration: 2032-11-01

Abstract

The utility model relates to the technical field of current transformers, in particular to a secondary short-circuit indicating device of a current transformer, which comprises an indicator shell, an annular power supply coil assembly, a load resistor, an LED indicator lamp and a short-circuit conductor, wherein the annular power supply coil assembly and the load resistor are respectively arranged in the indicator shell, the LED indicator lamp is arranged on the indicator shell, the short-circuit conductor is arranged in the indicator shell and penetrates through an annular inner hole on the annular power supply coil assembly, the load resistor and the LED indicator lamp are connected to two coil leading-out ends of the power supply coil assembly in parallel, a pair of electric connection pins are arranged at two ends of the short-circuit conductor, and the pair of electric connection pins extend out of the indicator shell. The utility model improves the safety and convenience of the current transformer.

Description

Secondary short circuit indicating device of current transformer

Technical Field

The utility model relates to the technical field of current transformers, in particular to a secondary short-circuit indicating device of a current transformer.

Background

The current transformer consists of a closed iron core and a coil (induction coil), wherein the coil is wound on the iron core, and the current transformer is an instrument for converting primary side large current into secondary side small current according to an electromagnetic induction principle to realize current measurement.

The current transformers are of various types, and typically include closed current transformers and open-close current transformers. The open-close type current transformer can measure current without disconnecting a measured line, and is convenient to use and wide in application.

However, the conventional current transformer has the following problems: when the current transformer is used, the secondary side coil cannot be opened, and because the secondary side coil is opened to cause high voltage, the safety of secondary side equipment and related detection personnel is possibly damaged, the secondary side of the current transformer is connected with the equipment, and the primary side is installed, so that the operation is very troublesome, and the installation of the current transformer is not facilitated.

In order to solve the problem of troublesome installation of the current transformer, one conceivable improvement technical scheme is to use a secondary short-circuit connecting sheet: when the current transformer is used, the secondary side coil is connected with the secondary short-circuit connecting sheet, so that a short-circuit loop of the secondary side coil is formed, and after the primary side and the secondary side of the current transformer are installed, the secondary short-circuit connecting sheet is manually removed. However, such a solution also has the following drawbacks: firstly, whether the short circuit connection sheet is to be connected secondarily and correctly is not known, whether the connection is firm or not is not known, otherwise, the safety problem is caused due to the connection problem; and secondly, even if the connection is correct, the dismantling is troublesome, and if the dismantling is problematic, the secondary side coil can still be opened.

Disclosure of Invention

In order to solve the problems, the utility model provides a secondary short circuit indicating device of a current transformer, which aims to improve the safety and convenience of the use of the current transformer. The specific technical scheme is as follows:

the utility model provides a current transformer secondary short circuit indicating device, includes the indicator casing, sets up respectively annular power supply coil subassembly and load resistance in the indicator casing, set up LED pilot lamp on the indicator casing, set up inside and traversing of indicator casing annular power supply coil subassembly goes up the short circuit conductor of annular hole, load resistance and LED pilot lamp parallel connection are in on two coil outlets of power supply coil subassembly, the both ends of short circuit conductor are provided with a pair of electric connection pin, a pair of electric connection pin stretches out outside the indicator casing.

Preferably, the annular power coil assembly, load resistor and short circuit conductor are encapsulated within the indicator housing by epoxy casting.

In the utility model, the annular power supply coil assembly comprises an annular iron core, a coil framework sleeved on the annular iron core and a power supply coil wound on the coil framework.

Preferably, the specification of the current transformer is 100/5A, the number of turns of the power supply coil is 1000 turns, and the resistance value of the load resistor is 1000 ohms.

The primary current of the current transformer with the specification of 100/5A is 100A, and the secondary current of the current transformer is 5A.

Preferably, the pair of electrical connection pins are located at one end of the indicator housing, and the LED indicator light is located at the other end of the indicator housing.

In the utility model, a pair of electric connection jacks are arranged on the outer shell of the current transformer, and the pair of electric connection pins and the pair of electric connection jacks are mutually matched and connected.

The two ends of the secondary coil inside the current transformer are correspondingly and electrically connected to the pair of electric connection jacks, and a pair of CT secondary outgoing lines are correspondingly and further connected to the pair of electric connection jacks.

Preferably, the current transformer is a closed current transformer or an open-close current transformer.

In the utility model, the indicator housing is a plastic housing.

The application method of the utility model is as follows:

(1) Before the current transformer is installed, a pair of electric connection pins of the secondary short-circuit indicating device are correspondingly inserted into a pair of electric connection jacks on the outer shell of the current transformer in advance;

(2) When the current transformer is installed, the primary side is installed and connected, and if the primary side is connected correctly, the LED indicator lamp emits light to indicate that the short circuit of the secondary side coil is successful; if the current transformer is not bright, the current transformer is indicated to have a problem or the indicator is not correctly short-circuited, and the current transformer needs to be checked;

(3) And after the secondary side coil is successfully shorted, the secondary side equipment is connected, and after the secondary side equipment is connected, the secondary short-circuit indicating device is pulled out.

The beneficial effects of the utility model are as follows:

firstly, the secondary short-circuit indicating device with the rapid plug-in structure is arranged, and the induced current provided by the annular power supply coil assembly is used for supplying power to the LED indicating lamp, so that an operator can confirm whether the secondary coil is in short circuit or not successfully, and the use safety of the current transformer is improved.

Second, the secondary short-circuit indicating device of the current transformer is convenient to install and remove, the shell of the indicating device is made of plastic, epoxy is filled in the shell of the indicating device, and the secondary short-circuit indicating device can be plugged and pulled by hands completely, so that the secondary short-circuit indicating device is convenient and quick to use.

Drawings

FIG. 1 is a schematic diagram of a secondary short circuit indicating device of a current transformer according to the present utility model;

FIG. 2 is a schematic diagram of the secondary short circuit indicating device in FIG. 1;

FIG. 3 is a schematic three-dimensional view of FIG. 1 (with the indicator housing on the secondary short circuit indicating device removed);

FIG. 4 is an enlarged partial schematic view of the portion of FIG. 3 relating to the secondary short circuit indicating device;

fig. 5 is a schematic diagram of the working principle of the secondary short circuit indicating device of the current transformer.

In the figure: 1. the current transformer comprises a current transformer body, a secondary short circuit indicating device, an indicator shell body, an annular power supply coil assembly, a load resistor, an LED indicator lamp, a short circuit conductor, an electrical connection pin, an annular iron core, a coil framework, a power supply coil, an electrical connection jack, a secondary outgoing line of 13 and CT, wherein the current transformer body, the secondary short circuit indicating device, the indicator shell body, the annular power supply coil assembly, the load resistor, the LED indicator lamp, the short circuit conductor, the electrical connection pin, the annular iron core, the coil framework, the electrical connection jack, the electrical connection wire and the secondary outgoing line of 13 and CT.

Detailed Description

The following describes the embodiments of the present utility model further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and are not intended to limit the scope of the present utility model.

Example 1:

an embodiment of a secondary short-circuit indicating device for a current transformer according to the present utility model is shown in fig. 1 to 5, and comprises an indicator housing 3, an annular power supply coil assembly 4 and a load resistor 5 which are respectively arranged in the indicator housing 3, an LED indicator lamp 6 arranged on the indicator housing 3, and a short-circuit conductor 7 arranged inside the indicator housing 3 and penetrating through an annular inner hole on the annular power supply coil assembly 4, wherein the load resistor 5 and the LED indicator lamp 6 are connected in parallel to two coil outlets of the power supply coil assembly 4, and a pair of electrical connection pins 8 are arranged at two ends of the short-circuit conductor 7, and the pair of electrical connection pins 8 extend out of the indicator housing 3.

Preferably, the annular power coil assembly 4, the load resistor 5 and the short-circuit conductor 7 are encapsulated in the indicator housing 3 by epoxy molding.

In this embodiment, the annular power supply coil assembly 4 includes an annular iron core 9, a coil former 10 sleeved on the annular iron core 9, and a power supply coil 11 wound on the coil former 10.

Preferably, the specification of the current transformer 1 is 100/5A, the number of turns of the power supply coil 11 is 1000 turns, and the resistance value of the load resistor 5 is 1000 ohms.

The primary current of the current transformer 1 with the specification of 100/5A is 100A, and the secondary current is 5A.

Preferably, the pair of electrical connection pins 8 is located at one end of the indicator housing 3, and the LED indicator lamp 6 is located at the other end of the indicator housing 3.

In this embodiment, a pair of electrical connection jacks 12 are provided on the outer casing of the current transformer 1, and the pair of electrical connection pins 8 and the pair of electrical connection jacks 12 are mutually mated and connected.

The two ends of the secondary coil inside the current transformer 1 are correspondingly and electrically connected to the pair of electrical connection jacks 12, and a pair of CT secondary outgoing lines 13 are correspondingly and further connected to the pair of electrical connection jacks 12.

Preferably, the current transformer 1 is a closed current transformer or an open-close current transformer.

In this embodiment, the indicator housing 3 is a plastic housing.

The application method of the embodiment is as follows:

(1) Before the current transformer 1 is installed, a pair of electric connection pins 8 of the secondary short-circuit indicating device 2 are correspondingly inserted into a pair of electric connection jacks 12 on the outer shell of the current transformer 1 in advance;

(2) When the current transformer 1 is installed, the primary side is installed and connected, and if the primary side is connected correctly, the LED indicator lamp 6 emits light to indicate that the short circuit of the secondary side coil is successful; if the current transformer is not bright, the current transformer 1 is indicated to have a problem or the indicator is not correctly short-circuited, and the current transformer needs to be checked;

(3) And after the secondary side coil is successfully shorted, the secondary side equipment is connected, and after the secondary side equipment is connected, the secondary short-circuit indicating device 2 is pulled out.

Example 2:

the specification of the transformer is 100/5A (primary current is 100A and secondary current is 5A), and a secondary short-circuit indicating device is designed.

Because the current of 5A is the current which can provide 5A for the secondary short-circuit device; the power supply coil of the short circuit device adopts a high-permeability silicon steel iron core, 13 x 18 x 5, and uses copper wires with the diameter of 0.11 to wind 1000T (turns).

The power supply coil may output: 5A/1000 t=0.005A current.

The 1K load resistor can output an alternating voltage of approximately 5V, and can completely drive the 3-5V LED lamp.

The output of the power supply coil is alternating current, the LED indicator lamp is in principle direct current input, but the alternating current can be driven, and the brightness is slightly lower than that of the direct current because the LED indicator lamp can be driven only in half wave, and the judgment of human eyes is not affected.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims

1. The utility model provides a current transformer secondary short circuit indicating device, its characterized in that includes the indicator casing, sets up respectively annular power supply coil subassembly and load resistance in the indicator casing, set up LED pilot lamp on the indicator casing, set up the indicator casing is inside and pass through the short circuit conductor of annular hole on the annular power supply coil subassembly, load resistance and LED pilot lamp parallel connection are in on two coil terminals of power supply coil subassembly, the both ends of short circuit conductor are provided with a pair of electric connection pin, a pair of electric connection pin stretches out outside the indicator casing.

2. The secondary short circuit indicating device of claim 1 wherein said annular power coil assembly, load resistor and short circuit conductor are encapsulated within said indicator housing by epoxy casting.

3. The secondary short circuit indicating device of a current transformer according to claim 1, wherein the annular power supply coil assembly comprises an annular iron core, a coil frame sleeved on the annular iron core, and a power supply coil wound on the coil frame.

4. A secondary short circuit indicating device for a current transformer according to claim 3, wherein the specification of the current transformer is 100/5A, the number of turns of the power supply coil is 1000 turns, and the resistance of the load resistor is 1000 ohms.

5. The secondary short circuit indicating device of claim 1 wherein said pair of electrical connection pins are located at one end of said indicator housing and said LED indicator light is located at the other end of said indicator housing.

6. The secondary short circuit indicating device of claim 1, wherein a pair of electric connection jacks are provided on an outer case of the current transformer, and the pair of electric connection pins and the pair of electric connection jacks are mutually coupled in pairs.

7. The secondary short circuit indicating device of claim 6, wherein two ends of the secondary coil inside the current transformer are correspondingly and electrically connected to the pair of electric connection jacks, and a pair of CT secondary lead wires are correspondingly connected to the pair of electric connection jacks.

8. The secondary short circuit indicating device of claim 1, wherein the current transformer is a closed current transformer or an open-close current transformer.

9. The secondary short circuit indicating device of claim 1 wherein said indicator housing is a plastic housing.