CN215644074U

CN215644074U - Temperature measuring current transformer

Info

Publication number: CN215644074U
Application number: CN202121432156.9U
Authority: CN
Inventors: 李泽胤
Original assignee: Tianjin Tailai Electric Power Equipment Technical Co ltd
Current assignee: Tianjin Tailai Electric Power Equipment Technical Co ltd
Priority date: 2021-06-27
Filing date: 2021-06-27
Publication date: 2022-01-25
Anticipated expiration: 2031-06-27

Abstract

The utility model relates to the technical field of power equipment, in particular to a temperature-measuring current transformer, which comprises a base and a main box body, wherein two sides in the main box body are fixedly connected with first fixing plates, the inner sides of the first fixing plates on two sides are fixedly connected with connecting plates, one side of a second fixing plate far away from the connecting plates is fixedly connected with a transformer body, one side of the main box body is fixedly provided with a terminal strip, the output ends of coil groups in the transformer body are respectively connected with one end of the inner side of the terminal strip through wires, the coil groups are encapsulated with temperature sensors through epoxy resin, the temperature sensors are connected with one end of the inner side of the terminal strip through the wires, one end of the outer side of the terminal strip connected with the temperature sensors is connected with a temperature controller through the wires, the temperature sensors are additionally arranged outside the transformer body to synchronously detect the temperature of the transformer body and match the display of the temperature controller, the monitoring and protecting actions can be timely and accurately carried out.

Description

Temperature measuring current transformer

Technical Field

The utility model relates to the technical field of power equipment, in particular to a temperature measurement current transformer.

Background

In the process of electric power engineering construction, the safety and reliability of power grid operation are the keys for ensuring the economic growth of electric power enterprises; meanwhile, the equipment maintenance force is also the basis for the efficient operation of the power system. The power transformation operation safety management and equipment maintenance of the power system are key factors for ensuring the safe transmission of electric energy by a power grid.

The mutual inductor is also called instrument transformer, and is a general name of current mutual inductor and voltage mutual inductor. Its function is mainly to convert high voltage or large current into standard low voltage (100V) or standard small current (5A or 1A, both referring to rated value) in proportion so as to realize standardization and miniaturization of measuring instrument, protection equipment and automatic control equipment. Meanwhile, the mutual inductor can be used for isolating a high-voltage system so as to ensure the safety of people and equipment.

The mutual inductor is matched with a measuring instrument and a metering device, can measure the voltage, the current and the electric energy of a primary system, is matched with a relay protection and automatic device, and can form electric protection and automatic control on various faults of a power grid. The performance and the running state of the mutual inductor directly affect the accuracy of measurement and measurement of the power system and the reliability of the action of the relay protection device, and are important conditions for ensuring the normal running of the power grid.

However, the mutual inductor generates heat during operation, which may cause the mutual inductor to generate heat and be damaged, and the main reasons are as follows:

1. the overload running time of the user is long, so that the mutual inductor is heated and burnt out.

2. The current transformer is opened for the second time to generate high voltage, so that the current transformer is burnt out.

3. The contact surface of the primary connecting busbar of the current transformer is oxidized too heavily, and the contact resistance is too large, so that the current transformer is burnt out due to heating.

4. The current transformer has overlong service life, is insulated and aged, and is locally punctured or discharged to generate overvoltage, so that the current transformer is heated and burnt out.

5. A short circuit is arranged in the current transformer winding, and the input voltage is too high; the abnormal frequency of the power supply or the load harmonic, the external short circuit and the like can cause the overheating of the iron core of the current transformer, and the temperature rise of the winding can be abnormal.

Therefore, it is necessary to monitor the temperature of the current transformer in real time.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a temperature measuring current transformer which can effectively solve the problems in the background technology.

In order to achieve the purpose, the utility model adopts the technical scheme that:

temperature measurement current transformer, including base, the main tank body, main tank body upper end both sides fixed mounting respectively has the baffle, the first fixed plate of inside both sides fixedly connected with of main tank body, both sides the inboard fixedly connected with connecting plate of first fixed plate, two second fixed plates of connecting plate lower surface middle part fixedly connected with, one side fixedly connected with mutual-inductor body of connecting plate is kept away from to the second fixed plate, main tank body one side fixed mounting has the terminal row, the output of coil assembly is respectively through the inboard one end of wire connecting terminal row in the mutual-inductor body, it has temperature sensor to encapsulate through epoxy on the coil assembly, temperature sensor passes through the inboard one end of wire connecting terminal row, is connected with temperature sensor terminal row outside one end is connected with temperature controller through the wire.

Preferably, a limiting notch is formed in one end of the base, a main box body is fixedly mounted in the middle of the upper surface of the base, and box shells are fixedly mounted on the two sides of the main box body and located on the upper surface of the base respectively.

Preferably, one side of the main box body is fixedly connected with a connecting block, a placing cavity is formed in one side, close to the base, of the connecting block, and a terminal strip is fixedly installed in the placing cavity.

Preferably, the middle part of the upper surface of the main box body is connected with four bolts in a penetrating manner, one end of each bolt, which is located inside the main box body, is fixedly connected with a primary terminal, and one end of each bolt, which is located inside the main box body, is fixedly connected with a first fixing plate.

Preferably, a plurality of guide grooves are formed in one side, close to the box shell, of each first fixing plate, the two guide grooves are in a group, a spring is fixedly mounted in each guide groove below the guide grooves, and one end, far away from the first fixing plates, of each spring is fixedly connected with a guide rod.

Preferably, a guide groove corresponding to the guide rod is arranged on one side of the case shell close to the first fixing plate, and a guide rod corresponding to the guide groove in the first fixing plate is arranged above the guide groove on one side of the case shell.

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

(1) the temperature sensor is additionally arranged outside the mutual inductor body, so that not only can the electricity consumption be monitored and the internal temperature of a product be detected, but also the temperature of the mutual inductor body can be synchronously detected, and the temperature of the mutual inductor body can be monitored by workers in real time in cooperation with the display of the temperature controller, so that the problem can be solved in time, and the mutual inductor body is prevented from being burnt due to overheating;

(2) through the spacing notch of seting up on the base, the box of being convenient for is installed on other equipment, set up guide way and guide bar respectively in first fixed plate and case shell, guide bar in the case shell alternates into the guide way of first fixed plate top, then in the guide way of below in the automatic bullet income case shell of guide bar through spring one end connection, the power of kick-backing through the spring of first fixed plate both sides makes first fixed plate fix inside the box, the stability of current transformer inner structure has been improved.

The advantage of this is that on the one hand, the probe of temperature sensor can be fixed, and on the other hand can ensure that the temperature sensor probe is contacted with the product steadily, guarantees the accuracy of detection, makes measurement, control terminal can in time accurately carry out control and protection action.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a temperature measuring current transformer according to the present invention;

FIG. 2 is a front view of a partial structure of a thermometric current transformer of the present invention;

FIG. 3 is a schematic view of the cross-sectional structure A-A of the thermometric current transformer of the present invention shown in FIG. 2;

FIG. 4 is a schematic diagram of a cross-sectional structure B-B in FIG. 2 of the temperature measuring current transformer of the present invention.

In the figure: 1. a main box body; 2. a cabinet housing; 3. a base; 4. a baffle plate; 5. a coil assembly; 6. a bolt; 7. a temperature sensor; 8. connecting blocks; 9. a terminal block; 10. a transformer body; 11. a first fixing plate; 12. a connecting plate; 13. a second fixing plate; 14. a guide bar; 15. a spring; 16. a temperature controller.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

As shown in figures 1-4, the temperature measuring current transformer comprises a base 3 and a main box body 1, wherein two sides of the upper end of the main box body 1 are respectively and fixedly provided with a baffle 4, two sides of the inside of the main box body 1 are fixedly connected with first fixing plates 11, the inner sides of the first fixing plates 11 on the two sides are fixedly connected with a connecting plate 12, the middle part of the lower surface of the connecting plate 12 is fixedly connected with two second fixing plates 13, one side of each second fixing plate 13 far away from the connecting plate 12 is fixedly connected with a transformer body 10, one side of the main box body 1 is fixedly connected with a connecting block 8, one side of the connecting block 8 close to the base 3 is internally provided with a placing cavity, a terminal block 9 is fixedly arranged in the placing cavity, the output end of a coil group 5 in the transformer body 10 respectively passes through one end of the inner side of a lead connecting terminal block 9, the coil group 5 is encapsulated with a temperature sensor 7 through epoxy resin, and the temperature sensor 7 passes through one end of the inner side of the lead connecting terminal block 9, terminal row 9 outside one end of being connected with temperature sensor 7 is connected with temperature controller 16 through the wire, power supply unit is through a terminal access current, be connected with the input in the coil assembly 5 through first fixed plate 11 and second fixed plate 13, output current signal through coil assembly 5 afterwards, signal of telecommunication through temperature sensor 7 output, after that, export for temperature controller 16 through terminal row 9, through increasing temperature sensor 7 outside mutual-inductor body 10, can synchronous detection mutual-inductor body 10's temperature, cooperation temperature controller 16 can be convenient for the staff in time to detect the temperature of mutual-inductor body 10, the discovery problem is in time handled, prevent that mutual-inductor body 10 from overheating and burning out.

In this embodiment, 3 one ends of base have been seted up spacing notches, and 3 upper surface middle part fixed mounting of base has

main tank

1, and 1 both sides of main tank just are located 3 upper surface of base and respectively fixed mounting have case shell 2, can be fixed main tank 1 with other equipment through spacing notches, can make current transformer install in the position of difference.

In this embodiment, four bolts 6 are connected to the middle of the upper surface of the main box 1 in a penetrating manner, one end of each bolt 6 located inside the main box 1 is fixedly connected with a primary terminal, and one end of each bolt 6 located inside the main box 1 is fixedly connected with a first fixing plate 11.

In this embodiment, a plurality of guide grooves are respectively formed on one side of each of two first fixing plates 11 close to the cabinet 2, the two guide grooves are in a group, a spring 15 is fixedly installed in the lower guide groove, a guide rod 14 is fixedly connected to one end of the spring 15 far away from the first fixing plate 11, a guide groove corresponding to the guide rod 14 is arranged on one side of the cabinet 2 close to the first fixing plate 11, a guide rod 14 corresponding to the guide groove in the first fixing plate 11 is arranged above the guide groove on one side of the cabinet 2, when the first fixing plate 11 is installed, the guide rod 14 with the spring 15 in the first fixing plate 11 is compressed, then the guide rod 14 in the cabinet 2 is inserted into the guide groove above the first fixing plate 11, then the guide rod 14 connected with one end of the spring 15 automatically bounces into the guide groove below the cabinet 2, the first fixing plate 11 is fixed inside the cabinet by the resilience force of the spring 15 on both sides of the first fixing plate 11, then fix first fixed plate 11 top and main tank 1 upper end inner wall through bolt 6, improved the stability of current transformer inner structure.

The working principle of the temperature measuring current transformer is as follows:

during the use, at first power supply unit passes through bolt 6 access current, again with terminal row 9 the terminal in proper order with the kilowatt-hour meter, relay protection ware and temperature controller 16 are connected, a terminal electric connection in bolt 6 and the coil assembly 5, output current through the coil assembly 5 afterwards, through thermal resistance 7 output signal of telecommunication, export for temperature controller 16 through terminal row 9 afterwards, through increasing thermal resistance 7 outside mutual-inductor body 10, not only can measure the electric current size, cooperation temperature controller 16 can also be convenient for the staff in time detect the temperature of mutual-inductor body 10, the discovery problem is handled in time, prevent that mutual-inductor body 10 from overheating and burning out.

It should be noted that the specific model specification of the temperature controller 16 is AI-518/518P;

the temperature sensor 7 adopts a PT100 platinum temperature sensor, and the temperature range is as follows: -50 ℃ to 200 ℃ and its resistance varies with temperature.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. Temperature measurement current transformer, including base (3), main tank body (1), its characterized in that: the temperature sensor is characterized in that baffles (4) are respectively and fixedly mounted on two sides of the upper end of the main box body (1), first fixing plates (11) are fixedly connected to two sides in the main box body (1), connecting plates (12) are fixedly connected to the inner sides of the first fixing plates (11) on two sides, two second fixing plates (13) are fixedly connected to the middle of the lower surface of each connecting plate (12), a transformer body (10) is fixedly connected to one side, away from the connecting plates (12), of each second fixing plate (13), a terminal row (9) is fixedly mounted on one side of the main box body (1), the output end of a coil group (5) in the transformer body (10) respectively passes through one end of the inner side of each wire connecting terminal row (9), a temperature sensor (7) is packaged on the coil group (5) through epoxy resin, and the temperature sensor (7) passes through one end of the inner side of each wire connecting terminal row (9), one end of the outer side of the terminal block (9) connected with the temperature sensor (7) is connected with a temperature controller (16) through a lead.

2. The thermometric current transformer of claim 1, wherein: spacing notch has been seted up to base (3) one end, base (3) upper surface middle part fixed mounting has main tank body (1), main tank body (1) both sides just are located base (3) upper surface fixed mounting respectively has case shell (2).

3. The thermometric current transformer of claim 1, wherein: the main tank body (1) one side fixedly connected with connecting block (8), connecting block (8) are close to one side inside of base (3) and have been seted up and place the chamber, it has terminal row (9) to place intracavity fixed mounting.

4. The thermometric current transformer of claim 1, wherein: the main tank body (1) upper surface middle part through connection has four bolts (6), bolt (6) are located the inside one end fixedly connected with primary terminal of main tank body (1), bolt (6) are located the inside one end fixedly connected with first fixed plate (11) of main tank body (1).

5. The thermometric current transformer of claim 2, wherein: two a plurality of guide ways have been seted up respectively to one side that first fixed plate (11) are close to case shell (2), two guide ways are a set of, the below fixed mounting has spring (15) in the guide way, one end fixedly connected with guide bar (14) of first fixed plate (11) are kept away from in spring (15).

6. The thermometric current transformer of claim 5, wherein: one side of the box shell (2) close to the first fixing plate (11) is provided with a guide groove corresponding to the guide rod (14), and the guide rod (14) corresponding to the guide groove in the first fixing plate (11) is arranged above the guide groove on one side of the box shell (2).