CN217881321U

CN217881321U - Protective relay using pressure change as electric signal

Info

Publication number: CN217881321U
Application number: CN202220998112.0U
Authority: CN
Inventors: 张斌; 胡世和
Original assignee: Shenyang Tak Kwong Electric Technology Co ltd
Current assignee: Shenyang Tak Kwong Electric Technology Co ltd
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-11-22
Anticipated expiration: 2032-04-28

Abstract

The utility model relates to a relay technical field, and disclose a take pressure change as electric signal's protective relay, the relay body includes QJ3-40 data plate, QJ3-40 upper seat, the sealed pad of glan head, binding post, QJ3-40 lower seat, the spacing jump ring of insulation board, the terminal insulation board, first alarm pressure switch, second alarm pressure switch, sealing washer between pressure alarm mechanism and lower seat, the bellows, bellows welding section of thick bamboo, the shielding spacer, shielding spacer-spacing jump ring, the alarm switch support, alarm switch is fixed and its adjustment frame and pressure alarm value adjusting screw, the bellows welding section of thick bamboo has been installed to QJ3-40 lower seat inside, the edge is turned over outwards to bellows welding section of thick bamboo upper end, sealing washer and the laminating of the edge of bellows welding section of thick bamboo between pressure alarm mechanism and the lower seat, set up two tunnel synchronous pressure alarm signal through first alarm pressure switch and second alarm pressure switch, also can set up two tunnel synchronous pressure alarm signal.

Description

Protective relay using pressure change as electric signal

Technical Field

The utility model relates to a relay technical field especially relates to an use pressure variation as electric signal's protective relay.

Background

At present, the conventional oil-immersed or airtight power transformer uses the internal pressure change of the tank as a protection device of an electrical signal, which is also called a pressure relief valve, and the key points of relay protection are as follows: when the temperature in the transformer rises or the inside of the transformer breaks down, hydraulic pressure or air pressure in the oil tank is transmitted into the pressure release valve cavity, the spring in the cavity is compressed, when the pressure increasing speed is 25 kPa/s-40 kPa/s, the pressure release valve is opened and triggers the alarm switch to send out an alarm signal to cut off the power supply when the pressure reaches a set opening pressure value, the oil tank of the transformer is protected, and the damage caused by overhigh pressure is prevented. Conventional pressure relief valve protection has disadvantages: 1. the pressure release valve can only be provided with 1 opening pressure value, and the corresponding accuracy of the pressure is low and is +/-5 kPa; 2. the pressure relief valve is adopted to protect the transformer box body, when the pressure in the transformer box body is slowly increased but not increased at a speed of 25-40 kPa/s, the problem of oil leakage and gas leakage can occur when the pressure relief valve is opened by 0.6 times, the problem of oil leakage and gas leakage cannot trigger an alarm switch of the pressure relief valve, the internal pressure of the transformer can be judged to be increased only when oil stains are found during field inspection, and the pressure value cannot be known when the internal pressure of the transformer is increased and after the internal pressure is increased; 3. when the pressure relief valve is adopted to provide protection for the transformer tank body, after the pressure relief valve is opened to send out an alarm signal, personnel must go to the site to manually reset the alarm signal, and the single use of the pressure relief valve cannot meet the requirements of unattended operation or unattended operation on the site.

To this end, we propose a protective relay with pressure variations as electrical signals.

SUMMERY OF THE UTILITY MODEL

The utility model discloses solve the technical problem that above-mentioned prior art exists, provide a protection relay with pressure variation as electrical signal.

In order to achieve the above object, the present invention adopts the following technical scheme, a protective relay using pressure change as an electrical signal, wherein the relay body comprises a QJ3-40 nameplate, a QJ3-40 upper seat, a glan head sealing gasket, a wiring terminal, a QJ3-40 lower seat, an insulating plate limit snap spring, a terminal insulating plate, a first alarm pressure switch, a second alarm pressure switch, a sealing ring between a pressure alarm mechanism and the lower seat, a corrugated pipe welding cylinder, a shielding spacer-limit snap spring, an alarm switch bracket, an alarm switch fixing and adjusting bracket thereof, and a pressure alarm value adjusting screw, the QJ3-40 lower seat is used for fixing a product on the top or the side of a transformer box body, the inside of the QJ3-40 lower seat is provided with the corrugated pipe welding cylinder, the upper end of the corrugated pipe welding cylinder is turned outwards, the sealing ring between the pressure alarm mechanism and the lower seat is attached to the turned edge of the corrugated pipe welding cylinder, the lower end of the corrugated pipe welding cylinder is turned inwards, a hole in the middle of the turned inwards edge is welded with the outer side of the opening end of the corrugated pipe to form a sealing structure, a shielding spacer is arranged on a hole groove below the QJ3-40 lower seat and is fixed by a shielding spacer-limiting snap spring, an alarm switch support is pressed on the corrugated pipe welding cylinder, an alarm switch fixing and adjusting frame is connected above the alarm switch support, an electric insulation sheet is clamped on the alarm switch fixing and adjusting frame, a first alarm pressure switch and a second alarm pressure switch are arranged on an electric insulation sheet clamp, a terminal insulation plate is arranged on a groove on the QJ3-40 lower seat and is fixed by an insulation plate limiting snap spring, a wiring terminal is soldered above the terminal insulation plate, and the QJ3-40 upper seat is arranged above the QJ3-40 lower seat, the gland head sealing gasket is positioned between the QJ3-40 upper seat and the gland head, and the top of the QJ3-40 upper seat is provided with a QJ3-40 nameplate.

Furthermore, the upper end of the corrugated pipe is a blind end which can elastically stretch out and draw back.

Furthermore, the first alarm pressure switch and the second alarm pressure switch are clamped and connected with the electric insulation sheet through bolts, the lower surfaces of trigger convex points of the first alarm pressure switch and the second alarm pressure switch are right opposite to the upper surface of a blind end bulge of the corrugated pipe, and a pressure alarm value adjusting screw is arranged between the alarm switch fixing and adjusting frame and the alarm switch bracket.

Furthermore, a lead is welded below the wiring terminal and is electrically connected with the wiring end of the first alarm pressure switch and the wiring end of the second alarm pressure switch respectively.

Furthermore, an upper seat and lower seat sealing gasket is arranged between the QJ3-40 upper seat and the QJ3-40 lower seat for sealing, and a Glan head is arranged on an excircle counter sinking hole of the QJ3-40 upper seat for electric wire outlet.

Advantageous effects

The utility model provides a take pressure variation as electrical signal's protective relay. The method has the following beneficial effects:

(1) According to the protective relay taking pressure change as an electrical signal, two paths of synchronous pressure alarm signals are set through the first alarm pressure switch and the second alarm pressure switch, and two paths of asynchronous pressure alarm signals can also be set.

(2) This kind of protective relay with pressure variation as electrical signal, through setting up the bellows, this bellows high temperature resistant low temperature performance is excellent, does not have the problem of temperature drift, and the precision can reach 2kPa, and pressure relay and interior external environment are the full seal isolated state, even transformer internal pressure surpasss the problem that the oil leak can not appear after pressure relay sets the pressure, the bellows can extend along with pressure increase, pressure reduction shortens, after triggering the warning, when pressure reduction to setting pressure below, alarm signal can automatic re-setting.

Drawings

The structures, proportions, sizes, and other elements shown in the specification are for the understanding of the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined by the claims, but rather by the claims.

Fig. 1 is a front perspective view of the present invention;

FIG. 2 is a front sectional view of the utility model;

figure 3 is a side perspective view of the utility model.

Illustration of the drawings:

1. QJ3-40 nameplates; 2. a QJ3-40 upper seat; 3. a glan head gasket; 4. a glan head; 5. a wiring terminal; 6. a QJ3-40 lower seat; 7. an insulation plate limit clamp spring; 8. a terminal insulating plate; 9. a first alarm pressure switch; 10. a second alarm pressure switch; 11. a sealing ring is arranged between the pressure alarm mechanism and the lower seat; 12. a bellows; 13. a bellows welding cylinder; 14. a shielding spacer; 15. shielding spacer-limiting snap spring; 16. an alarm switch bracket; 17. the alarm switch is fixed and the adjusting frame thereof; 18. a pressure alarm value adjusting screw; 19. the upper seat and the lower seat are sealed.

Detailed Description

A protective relay taking pressure change as an electrical signal is disclosed, as shown in figures 1-3, the relay body comprises a QJ3-40 nameplate 1, a QJ3-40 upper seat 2, a Glan head sealing gasket 3, a wiring terminal 5, a QJ3-40 lower seat 6, an insulating plate limit clamp spring 7, a terminal insulating plate 8, a first alarm pressure switch 9, a second alarm pressure switch 10, a sealing ring 11 between a pressure alarm mechanism and the lower seat, a corrugated pipe 12, a corrugated pipe welding cylinder 13, a shielding spacer 14, a shielding spacer-limit clamp spring 15, an alarm switch bracket 16, an alarm switch fixing and adjusting frame 17 and a pressure alarm value adjusting screw 18, the QJ3-40 lower seat 6 is used for fixing the product on the top or the side of a transformer box body, the QJ3-40 lower seat 6 is internally provided with a corrugated pipe welding cylinder 13, the upper end of the corrugated pipe welding cylinder 13 is turned outwards, the pressure alarm mechanism is attached to the turned edge of a lower seat sealing ring 11 and a corrugated pipe welding cylinder 13, the lower end of the corrugated pipe welding cylinder 13 is turned inwards, a hole in the middle of the turned-in edge is welded with the outer side of the opening end of a corrugated pipe 12 to form a sealing structure, a shielding spacer 14 is arranged on a hole groove below a QJ3-40 lower seat 6, the shielding spacer 14 is fixed by a shielding spacer-limiting clamp spring 15, an alarm switch support 16 is pressed on the corrugated pipe welding cylinder 13, an alarm switch fixing and adjusting frame 17 is connected above the alarm switch support 16, an electric insulation sheet is clamped on the alarm switch fixing and adjusting frame 17, a first alarm pressure switch 9 and a second alarm pressure switch 10 are arranged on the electric insulation sheet clamp, a terminal insulation plate 8 is arranged on a groove on the QJ3-40 lower seat 6 and is fixed by an insulation plate limiting clamp spring 7, a wiring terminal 5 is soldered above the terminal insulation plate 8, the automatic alarm device is characterized in that the QJ3-40 upper seat 2 is arranged above the QJ3-40 lower seat 6, the gland head sealing gasket 3 is positioned between the QJ3-40 upper seat 2 and the gland head 4, the top of the QJ3-40 upper seat 2 is provided with the QJ3-40 nameplate 1, the upper end of the corrugated pipe 12 is a blind end which can elastically stretch out and draw back, the first alarm pressure switch 9 and the second alarm pressure switch 10 are connected with an electric clamping device through bolts, the lower surfaces of trigger salient points of the first alarm pressure switch 9 and the second alarm pressure switch 10 are just opposite to the upper surface of a blind end bulge of the corrugated pipe 12, a pressure alarm value adjusting screw 18 is arranged between the alarm switch fixing and adjusting frame 17 and the alarm switch support 16, a lead is welded below the wiring terminal 5 and is respectively electrically connected with the first alarm pressure switch 9 and the second alarm pressure switch 10, the upper seat 2 of the QJ3-40 upper seat 2 and the lower seat 6 of the QJ3-40 lower seat are provided with an upper seat sealing gasket 19 for sealing, the QJ3-40 upper seat 2 is provided with an electric sealing gasket, the outer circle pressure switch 4 is provided with an outer circle, and the alarm switch is also provided with an alarm switch pressure switch and a synchronous pressure switch and a pressure switch and can be arranged on the outer circle of the alarm switch 9.

Through the arrangement of the corrugated pipe 12, the corrugated pipe 12 is excellent in high temperature and low temperature resistance, the temperature drift problem does not exist, the precision can reach +/-2 kPa, the pressure relay and the inner environment and the outer environment are in a fully sealed and isolated state, the problem of oil leakage cannot occur even if the internal pressure of the transformer exceeds the set pressure of the pressure relay, the corrugated pipe 12 can be extended along with the increase of the pressure and shortened along with the reduction of the pressure, and after the alarm is triggered, when the pressure is reduced to be lower than the set pressure, the alarm signal can be automatically reset.

The utility model discloses a theory of operation: the internal pressure of the transformer is conducted into the corrugated pipe 12 through the lower cavity of the QJ3-40 lower seat 6, so that the corrugated pipe expands and extends, the blind end of the corrugated pipe 12 pushes the first alarm pressure switch 9 and the second alarm pressure switch 10 to be closed to form a loop to work, and when the temperature is lower than a threshold value, the corrugated pipe 12 contracts so that the first alarm pressure switch 9 and the second alarm pressure switch 10 stop working.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only illustrative of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. The utility model provides an use pressure variation as electric signal's protective relay, includes the relay body, its characterized in that: the relay body comprises a QJ3-40 nameplate (1), a QJ3-40 upper seat (2), a Glan head sealing gasket (3), a wiring terminal (5), a QJ3-40 lower seat (6), an insulation plate limiting clamp spring (7), a terminal insulation plate (8), a first alarm pressure switch (9), a second alarm pressure switch (10), a pressure alarm mechanism and lower seat sealing ring (11), a corrugated pipe (12), a corrugated pipe welding cylinder (13), a shielding spacer (14), a shielding spacer-limiting clamp spring (15), an alarm opening Guan Zhijia (16), an alarm switch fixing and adjusting frame (17) and a pressure alarm value adjusting screw (18), wherein the QJ3-40 lower seat (6) is used for fixing a product at the top or the side of a transformer box body, the corrugated pipe welding cylinder (13) is arranged in the QJ3-40 lower seat (6), the upper end of the corrugated pipe welding cylinder (13) is outwards turned over, the pressure alarm mechanism and the lower seat sealing ring (11) are welded with the edge of the corrugated pipe welding cylinder (13), the lower seat sealing gasket (13) is welded with the shielding spacer (14) along the inner side of the middle shielding spacer (14), the middle shielding spacer is welded with the inner side of the shielding spacer (14) and the middle shielding spacer (14) is arranged in a groove of the middle shielding spacer (14), the alarm switch Guan Zhijia (16) is pressed on a corrugated pipe welding cylinder (13), an alarm switch fixing and adjusting frame (17) is connected above the alarm switch Guan Zhijia (16), an electric insulation sheet is clamped on the alarm switch fixing and adjusting frame (17), a first alarm pressure switch (9) and a second alarm pressure switch (10) are arranged on the electric insulation sheet clamp, a terminal insulation plate (8) is installed on a groove on a QJ3-40 lower seat (6) and fixed by an insulation plate limiting clamp spring (7), a wiring terminal (5) is soldered above the terminal insulation plate (8), a QJ3-40 upper seat (2) is installed above the QJ3-40 lower seat (6), a Glan head sealing gasket (3) is located between the QJ3-40 upper seat (2) and a Glan head (4), and a QJ3-40 nameplate (1) is installed at the top of the QJ3-40 upper seat (2).

2. A protective relay using pressure variation as an electrical signal according to claim 1, characterized in that: the upper end of the corrugated pipe (12) is a blind end which can elastically stretch out and draw back.

3. A protective relay using pressure variation as an electrical signal according to claim 2, characterized in that: the first alarm pressure switch (9) and the second alarm pressure switch (10) are connected with an electric insulation sheet in a clamping mode through bolts, the lower surfaces of trigger salient points of the first alarm pressure switch (9) and the second alarm pressure switch (10) are opposite to the upper surface of a blind end bulge of the corrugated pipe (12), and a pressure alarm value adjusting screw (18) is arranged between an alarm switch fixing and adjusting frame (17) and the alarm switch Guan Zhijia (16).

4. A protective relay using pressure variation as an electrical signal according to claim 1, characterized in that: and a lead is welded below the wiring terminal (5) and is electrically connected with wiring ends of the first alarm pressure switch (9) and the second alarm pressure switch (10) respectively.

5. A protective relay using pressure variation as an electrical signal according to claim 1, characterized in that: an upper seat and lower seat sealing gasket (19) is arranged between the QJ3-40 upper seat (2) and the QJ3-40 lower seat (6) for sealing, and a Glan head (4) for electric outgoing is arranged on the excircle spot facing of the QJ3-40 upper seat (2).