CN202473572U

CN202473572U - Exciting transformer

Info

Publication number: CN202473572U
Application number: CN2012200721872U
Authority: CN
Inventors: 徐九君
Original assignee: SHANDONG TEWEI TRANSFORMER PLANT
Current assignee: SHANDONG TEWEI TRANSFORMER PLANT
Priority date: 2012-02-29
Filing date: 2012-02-29
Publication date: 2012-10-03
Anticipated expiration: 2022-02-28

Abstract

The utility model discloses an exciting transformer comprising a transformer body, wherein the transformer body is provided with a high voltage side and a low voltage side, wherein a temperature sensing element is arranged on the winding of each of the high voltage side and the low voltage side; the temperature sensing element is electrically connected to a temperature monitoring device; and a grounding shielding device is mounted between the windings of the high voltage side and the low voltage side. The exciting transformer can be used for effectively monitoring the temperature, guaranteeing the normal production, and simultaneously, reducing the electrical loss.

Description

Excitation transformer

Technical field

The utility model relates to the transformer technology field, especially relates to a kind of excitation transformer.

Background technology

Excitation transformer is the device that the three-phase AC excitation power supply is provided for generator excited system specially, and existing excitation transformer because long-play causes the excitation transformer temperature too high, produces fault through regular meeting; Produce thereby influence is normal, simultaneously, because the uneven horizontal leakage flux that produces of the local magnetic potential of winding in the excitation transformer main empty path; It is axial that most of leakage flux is parallel to transformer; Only bend at two ends up and down at coil, the magnetic line of force produces eddy current in this part easily with the top and the bottom that pass across shielding of different angles; For fear of the problems referred to above; Usually between the high-low pressure winding, add around the electrostatic screen layer, but install additional after the screen, the eddy current that stray field produces in screen during operation will increase the load loss of transformer.

The utility model content

The utility model technical problem to be solved is: a kind of excitation transformer is provided, effectively monitors the temperature of excitation transformer, guaranteed ordinary production, reduced electric damage simultaneously.

For solving the problems of the technologies described above; The technical scheme of the utility model is: excitation transformer; Comprise: the transformer body, the transformer body is provided with high-pressure side and low-pressure side, is provided with temp-sensing element on the winding of said high-pressure side and low-pressure side; Said temp-sensing element is electrically connected with device for monitoring temperature, between the winding of said high-pressure side and low-pressure side earthing screen device is installed.

Preferably; Said device for monitoring temperature comprises the shell body; Be provided with power supply, temperature sampling device, thermistor transmitter and relay in the said shell body; Said power output end is electrically connected with said temperature sampling device and thermistor transmitter respectively, and said power output end is electrically connected with relay through a normally opened contact.

Preferably, said earthing screen device is provided with screen, and said screen is formed by the Copper Foil coiling, and the end of said Copper Foil is provided with the cutout gap, and said Copper Foil is connected with ground lead.

Adopted technique scheme; The beneficial effect of the utility model is: owing on excitation transformer, set up device for monitoring temperature, so this excitation transformer is effectively monitored the temperature of excitation transformer, guaranteed ordinary production; On excitation transformer, set up simultaneously earthing screen device; The eddy current of leakage flux on screen blocked in the cutout gap of earthing screen device, and the supplementary load loss when having reduced transformer load are so this excitation transformer has reduced electric damage.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further specified.

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is the electrical schematic diagram of device for monitoring temperature;

Fig. 3 is the structural representation of screen;

Wherein: 1, transformer body; 2, high-pressure side; 3, low-pressure side; 5, device for monitoring temperature; 6, earthing screen device; 41, first temp-sensing element; 42, second temp-sensing element; 51, temperature sampling device; 52, thermistor transmitter; 53, relay; 54, normally opened contact; 61, screen; 62, cutout gap; 63, ground lead.

Embodiment

As shown in Figure 1; Excitation transformer; Comprise transformer body 1, transformer body 1 is provided with high-pressure side 2 and low-pressure side 3, is respectively arranged with first temp-sensing element 41 and second temp-sensing element 42 on the winding of high-pressure side 2 and low-pressure side 3; First temp-sensing element 41 and second temp-sensing element 42 are electrically connected with device for monitoring temperature 5, between the winding of high-pressure side 2 and low-pressure side 3 earthing screen device 6 are installed.

As shown in Figure 2; Device for monitoring temperature 5 comprises the shell body; Be provided with power supply, temperature sampling device 51, thermistor transmitter 52 and relay 53 in the shell body, power output end is electrically connected with temperature sampling device 51 and thermistor transmitter 52 respectively, and power output end is electrically connected with relay 53 through a normally opened contact 54; So this excitation transformer is effectively monitored the temperature of excitation transformer, has guaranteed ordinary production.

The thermistor attemperating unit that the said temperature supervising device adopts, certainly, device for monitoring temperature 5 can also be the electronic type attemperating unit.

As shown in Figure 3; Earthing screen device 6 is provided with screen 61, and screen 61 is formed by the Copper Foil coiling, and the end of Copper Foil is provided with cutout gap 62; Copper Foil is connected with ground lead 63; The eddy current of leakage flux on screen 61 blocked in the cutout gap 62 of earthing screen device 6, and the supplementary load loss when having reduced transformer load are so this excitation transformer has reduced electric damage.

In sum, this excitation transformer is effectively monitored the temperature of excitation transformer, has guaranteed ordinary production, has reduced electric damage simultaneously.

The utility model is not limited to above-mentioned concrete execution mode, and those of ordinary skill in the art is from above-mentioned design, and without performing creative labour, all conversion of having done all drop within protection scope of the present invention.

Claims

1. excitation transformer; Comprise: the transformer body; The transformer body is provided with high-pressure side and low-pressure side, it is characterized in that, is provided with temp-sensing element on the winding of said high-pressure side and low-pressure side; Said temp-sensing element is electrically connected with device for monitoring temperature, between the winding of said high-pressure side and low-pressure side earthing screen device is installed.

2. excitation transformer as claimed in claim 1; It is characterized in that; Said device for monitoring temperature comprises the shell body; Be provided with power supply, temperature sampling device, thermistor transmitter and relay in the said shell body, said power output end is electrically connected with said temperature sampling device and thermistor transmitter respectively, and said power output end is electrically connected with relay through a normally opened contact.

3. according to claim 1 or claim 2 excitation transformer is characterized in that said earthing screen device is provided with screen, and said screen is formed by the Copper Foil coiling, and the end of said Copper Foil is provided with the cutout gap, and said Copper Foil is connected with ground lead.