CN217237027U

CN217237027U - Passive temperature monitoring alarm device for tap switch of dry-type transformer

Info

Publication number: CN217237027U
Application number: CN202220538413.5U
Authority: CN
Inventors: 赵春艳; 赖夏生; 卢传炬; 唐金权; 杨祥江; 毛启武
Original assignee: Pearl Electric Co ltd
Current assignee: Pearl Electric Co ltd
Priority date: 2022-03-10
Filing date: 2022-03-10
Publication date: 2022-08-19
Anticipated expiration: 2032-03-10

Abstract

The utility model discloses a passive temperature monitoring alarm device for tap changer of dry-type transformer, which comprises a body, the body includes the shell and encapsulates get electric coil, rectifier circuit module, normally open type bimetallic strip temperature switch and warning module in the shell, normally open type bimetallic strip temperature switch and warning module form series circuit, it passes through to get the electric coil rectifier circuit module does the series circuit power supply, normally open type bimetallic strip temperature switch's temperature measurement face passes through trompil on the shell bottom surface exposes, temperature monitoring alarm device still including be used for with the body is fixed to clitellum on the tap piece of dry-type transformer. The utility model adopts a single structure, is not directly connected with the outside, and can be directly arranged on a high-voltage coil tapping sheet for temperature monitoring; additionally, the utility model discloses an induction electricity-taking, the volume does not receive the restriction of battery box size, can be more small and exquisite to more be suitable for its application scenario.

Description

Passive temperature monitoring alarm device for tap switch of dry-type transformer

Technical Field

The utility model relates to a monitoring technology field of dry-type transformer, concretely relates to passive temperature monitoring alarm device that dry-type transformer tapping switch department used.

Background

In the use process of the dry type transformer, a tapping gear is adjusted within a certain range according to the requirement of an application scene on output voltage, the tapping gear is adjusted by connecting a tapping sheet with a tapping nut of a specified tap in a coil through a bolt, the tapping position is connected with the tapping wire and the tapping nut through welding, the outside is connected with the tapping sheet through the bolt, and therefore the tapping position becomes a main risk point of the whole coil. Therefore, temperature monitoring at this location is essential.

However, for such distribution transformers, where voltages are up to 10kV, conventional temperature probes cannot be installed for temperature monitoring. The conventional temperature measuring probe is usually composed of a temperature sensitive resistor, and the temperature sensitive resistor collects temperature signals and transmits the temperature signals to a collector through a line for signal analysis. The temperature signal is typically a low voltage or low current signal. When used at the tap, high ambient pressure can be transmitted to the collector end via the temperature signal, causing collector failure or damage. Such as a conventional pt100 temperature probe, which is commonly used for temperature monitoring of the low-voltage side of the dry-type transformer, but cannot be used for temperature monitoring at the tapping piece.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an it is convenient to install, can be used to the device of dry-type transformer tapping switch temperature monitoring.

The invention purpose of the utility model is realized by the following scheme: the utility model provides a dry-type transformer tap changer is with passive temperature monitoring alarm device, includes the body, the body includes the shell and encapsulates get electric coil, rectifier circuit module, normally open bimetallic strip temperature switch and warning module in the shell, normally open bimetallic strip temperature switch and warning module form the series circuit, it passes through to get the electric coil rectifier circuit module does the series circuit power supply, normally open bimetallic strip temperature switch's temperature measurement face passes through trompil on the shell bottom surface exposes, temperature monitoring alarm device still including be used for with the body is fixed to clitellum on the tap piece of dry-type transformer.

The power taking coil obtains energy from a leakage magnetic field of the transformer through an electromagnetic induction principle and converts the energy into alternating current, and the alternating current is rectified into required direct current through the rectifying circuit module to be used as a power supply of the whole system. When the normally-open bimetallic strip temperature switch senses that the temperature of the measuring position exceeds a preset value, the normally-open bimetallic strip temperature switch controls the series loop to be conducted, and the warning module generates warning information to remind operation and maintenance personnel. The utility model discloses temperature monitoring alarm device does not directly link to each other with the external world, and this kind of monomer structure is equivalent to a suspension electric potential in near electric field of dry-type transformer, but direct mount carries out temperature monitoring on high tension coil shunting piece, need not to consider insulating scheduling problem. In addition, shunting piece department, the position is narrow, the utility model discloses temperature monitoring alarm device adopts the response to get the electricity, makes its volume not restricted by battery box size, and the volume can be more small and exquisite, more is suitable for this application scenario.

The girdle is a silicon steel girdle and is formed by two sections with the middle part being divided, and the other ends of the two sections of girdle are respectively connected with the two sides of the shell. The silicon steel is high-temperature resistant, is made into an annular belt, has basically unchanged strength when the temperature changes, and can stably fix the body on the tapping piece. And the ring belt adopts a breaking structure, so that the temperature monitoring and alarming device is more convenient to mount.

The warning module comprises a red indicator light and a buzzer, so that sound and light alarm can be generated when the temperature is over-high, and the warning module can be noticed more easily.

Has the advantages that:

the temperature monitoring alarm device of the utility model adopts a single structure, is not directly connected with the outside, and can be directly arranged on a high-voltage coil tapping sheet for temperature monitoring; on this basis, the utility model discloses temperature monitoring alarm device adopts the response to get the electricity, and the volume does not receive the restriction of battery box size, can be more small and exquisite to more be suitable for its application scenario.

Drawings

Fig. 1 is a structural schematic diagram of a dry-type transformer tapping sheet;

fig. 2 is a schematic structural diagram of a temperature monitoring alarm device according to a preferred embodiment of the present invention;

fig. 3 is a schematic circuit diagram of the temperature monitoring alarm device according to the preferred embodiment of the present invention.

Detailed Description

The invention will be further explained with reference to the drawings and the specific embodiments.

As shown in fig. 1, the temperature monitoring and alarming device of the present embodiment is sleeved on a tap piece a of the dry-type transformer, which is used for connecting different tap taps of the high-voltage coil. Tap a is an important component for regulating the output voltage of the dry-type transformer. Because the welding of the tap lead and the connection of an external bolt are included, the fault that the tap piece a is in poor contact with the connection part of the bolt due to the fact that the tap piece is installed in an irregular mode after the tap position is adjusted can occur, the position is overheated, and even the whole equipment is burnt out can be caused. Therefore, temperature monitoring at this location is essential.

Fig. 2 is a schematic structural diagram of the temperature monitoring alarm device of the embodiment, which generally includes a silicon steel ring belt 3 and a main body.

The main body is composed of a power-taking coil, a rectifying circuit module, a red indicator light, a buzzer and a normally-open bimetallic strip temperature switch 2 which are packaged in a shell 1. Here, the encapsulation means that the devices are collectively installed in the housing 1, and it is not necessary to embed each device in advance by means of casting. The circuit connection relationship of the two is shown in figure 3, a normally-open bimetallic strip temperature switch 2, namely WK, a red indicator light and a buzzer in figure 3 form a series loop, and a power taking coil supplies power to the series loop through a rectifier circuit module. The temperature sensing end of the normally open bimetallic strip temperature switch 2 is exposed through the opening on the bottom surface of the shell 1. The silicon steel girdle 3 is composed of two sections with the middle part being divided, and the two sections of girdle are respectively arranged on two sides of the shell 1.

The working principle of the embodiment is as follows: the temperature monitoring and alarming device is directly arranged on a tapping sheet a of the dry-type transformer, which is used for connecting different tapping taps of the high-voltage coil, by utilizing an annular belt, and the temperature measuring surface of the temperature switch is coated with heat-conducting silicone grease and then is contacted with the tapping sheet a. After the transformer is electrified, a leakage magnetic field can be generated in the space around the transformer, the power taking coil obtains energy from the leakage magnetic field of the dry type transformer through the electromagnetic induction principle and converts the energy into alternating current, and the alternating current is rectified into required direct current through the rectifier circuit module to serve as a power supply of the whole device. The temperature switch, the red indicator light and the buzzer in the device are connected in series in the circuit. When the temperature of the measuring position exceeds the preset value, the bimetallic strip in the temperature switch is conducted after being heated and deformed, the red indicating lamp and the buzzer give out sound and light alarm, operation and maintenance personnel can conveniently and timely and accurately position the fault position and take corresponding measures to avoid causing larger accidents. The red indicating lamp and the buzzer are used as warning modules, and sound and light alarm can be generated when the temperature is over-high, so that the attention of operation and maintenance personnel can be easily aroused.

The temperature monitoring and alarming device is a passive device, supplies power in an induction power-taking mode, is equivalent to a suspension potential in an electric field, and can be directly installed on a high-voltage coil tapping sheet without considering the insulation problem. In addition, induction power taking is adopted, the size is not limited by the size of a battery box, and the battery box is small in size. Therefore, the temperature monitoring and alarming device of the embodiment can completely adapt to the working environment with high voltage and narrow space at the tapping sheet. The temperature monitoring alarm device of the embodiment also has the advantages of simple structure and convenience in installation.

Select the temperature switch of different models as required, utilize these switches to have the characteristics of different closed temperatures, can set for the utility model discloses temperature monitoring alarm device's temperature threshold value.

Claims

1. The utility model provides a passive temperature monitoring alarm device for tap changer of dry-type transformer, its characterized in that, includes the body, the body includes the shell and encapsulates get electric coil, rectifier circuit module, normally open bimetallic strip temperature switch and warning module in the shell, normally open bimetallic strip temperature switch and warning module form the series circuit, it passes through to get the electric coil rectifier circuit module does the power supply of series circuit, normally open bimetallic strip temperature switch's temperature measurement face passes through trompil on the shell bottom surface exposes, temperature monitoring alarm device still including be used for with the body is fixed to clitellum on the tap piece of dry-type transformer.

2. The passive temperature monitoring and alarming device for the tap changer of the dry-type transformer as claimed in claim 1, wherein the girdle is a silicon steel girdle which is formed by two sections with the middle part being broken, and the other ends of the two sections of girdle are respectively connected with the two sides of the shell.

3. The passive temperature monitoring and alarming device for the tap changer of the dry-type transformer as recited in claim 2, wherein the alarming module comprises a red indicator light and a buzzer.