CN115621866A

CN115621866A - Motor protection device

Info

Publication number: CN115621866A
Application number: CN202211141505.0A
Authority: CN
Inventors: 丁昊; 董志超; 连立东; 施浩; 高颖; 姜栋; 冯斌; 武博; 兰天虹; 刘兴
Original assignee: Taiyuan No2 Thermal Power Plant Of Datang Shanxi Power Generation Co ltd
Current assignee: Taiyuan No2 Thermal Power Plant Of Datang Shanxi Power Generation Co ltd
Priority date: 2022-09-20
Filing date: 2022-09-20
Publication date: 2023-01-17

Abstract

The invention provides a motor protection device, belonging to the technical field of motor protection; the system comprises a power distribution cabinet for controlling the operation of a high-pressure pump motor, wherein a cabinet door and a protection box are arranged on the power distribution cabinet, the protection box is arranged on one side of the cabinet door, an intelligent circuit breaker is arranged in the cabinet door, the protection box is electrically connected with the intelligent circuit breaker, an executing element of the intelligent circuit breaker is a magnetic flux converter with a permanent magnet, and a plurality of theme menus comprising a measurement menu, a system parameter setting menu, a protection function setting menu and a history recording and maintaining menu are arranged on the protection box; the cabinet door is further provided with a mounting assembly for fixing the protection box, and the mounting assembly comprises a mounting clamping seat matched with the protection box and a plurality of bolts mounted inside the power distribution cabinet. The invention solves a series of problems that the existing high-pressure pump set of the thermal power plant is unstable in operation, easy to generate fault-free misoperation and the like by arranging the protection box and the like.

Description

Motor protection device

Technical Field

The invention relates to the technical field of motor protection, in particular to a motor protection device.

Background

The thermal power plant is a thermal power plant which utilizes extraction steam or exhaust steam of a steam turbine to supply heat to users while generating power. The main working principle is that hot water generated by a thermal power plant is used for heating again. The daily operation of the thermal power plant needs to adopt a high-pressure pump to carry out chemical water treatment operation.

A power switch of a high-pressure pump adopts a Schneider micro6.0 intelligent module protection device, which is found during actual use, the power switch has high failure rate, no failure and misoperation occur frequently when the power switch is started, interface information is less, action reasons are not convenient to analyze, and the problem cannot be thoroughly solved by completely replacing the Schneider micro6.0 intelligent module protection device.

Disclosure of Invention

The invention aims to solve the technical problem of providing a motor protection device to solve the series problems that the operation of a high-pressure pump set of the existing thermal power plant is unstable, fault-free misoperation is easy to occur and the like.

In order to solve the technical problems, the invention provides the following technical scheme:

a motor protection device comprises a power distribution cabinet for controlling a high-pressure pump motor to operate, wherein a cabinet door and a protection box are arranged on the power distribution cabinet, the protection box is arranged on one side of the cabinet door, an intelligent circuit breaker is arranged in the cabinet door, the protection box is electrically connected with the intelligent circuit breaker, an executing element of the intelligent circuit breaker is a magnetic flux converter with a permanent magnet, and a plurality of theme menus comprising a measurement menu, a system parameter setting menu, a protection function setting menu and a history recording and maintaining menu are arranged on the protection box; the cabinet door is further provided with an installation assembly used for fixing the protection box, the installation assembly comprises an installation clamping seat matched with the protection box and a plurality of bolts installed inside the power distribution cabinet, the installation assembly further comprises a U-shaped rod and a limiting spring installed inside the power distribution cabinet, and two ends of the U-shaped rod penetrate through the cabinet door and are sleeved on the protection box.

Preferably, the measurement menu is used for displaying parameters of current I, voltage U, frequency F, electric energy E, power P and harmonic wave H, and the system parameter setting menu comprises clock setting, measurement setting, test outlet and input I/output O setting functions.

Preferably, the protection function setting menu comprises current protection, voltage protection, load monitoring and other protection, and the history recording and maintenance menu is used for providing current alarm, operation times, contact wear, trip record, alarm record, displacement record, breaker position and energy storage state information.

Preferably, the mounting clamp seat is attached to one side of the cabinet door, a plurality of threaded sleeves which are uniformly distributed are mounted on the mounting clamp seat, a plurality of groups of anti-theft holes and anti-theft grooves which correspond to the threaded sleeves in position are formed in one side of the cabinet door, one ends of a plurality of bolts penetrate through the corresponding anti-theft holes and are sleeved in the corresponding threaded sleeves in a threaded manner, and the nut ends of the bolts are dragged to be located in the corresponding anti-theft grooves.

Preferably, the mounting base is further provided with a mounting groove, the protection box is provided with a base, and the base is slidably sleeved in the mounting groove.

Preferably, the base and the cabinet door are further provided with a plurality of groups of limiting holes corresponding in position, and two ends of the U-shaped rod are respectively sleeved in the two groups of limiting holes at the same height in a sliding manner.

Preferably, the same vertical connecting rod is connected between the two U-shaped rods, a handle is sleeved on the vertical connecting rod, and an anti-skidding groove is formed in the handle.

Preferably, the two ends of the U-shaped rod are fixedly sleeved with fixed disks, the limiting spring is sleeved at one end corresponding to the U-shaped rod, and two sides of the limiting spring are respectively connected with the cabinet door and the corresponding fixed disks.

Preferably, one side of cabinet door still install and correspond an extension section of thick bamboo of spacing hole coaxial arrangement, it is a plurality of the other end of an extension section of thick bamboo all fixed cover has connect the anticreep circle, the internal diameter size of anticreep circle is less than and corresponds the internal diameter size of an extension section of thick bamboo, and is a plurality of still all fixed the cup jointing on the one end of U-shaped pole with corresponding the anticreep dish of anticreep circle looks adaptation, the external diameter of anticreep dish is greater than and corresponds the internal diameter size of anticreep circle.

Preferably, a plurality of mechanical door locks matched with the power distribution cabinet are further arranged on the cabinet door.

Compared with the prior art, the invention at least has the following beneficial effects:

among the above-mentioned scheme, through be equipped with a plurality of different theme menus in the protecting box, there is perfect software and hardware self-checking procedure, and the interference killing feature is strong: the non-sinusoidal current immunity, immunity to current sag and interruption, fast transient pulse group immunity, surge immunity, electrostatic discharge, radio frequency electromagnetic field immunity and radio frequency radiation emission tests caused by harmonic all pass all tests of GB14048.2 standard, the overall reliability of a high-voltage pump set of a thermal power plant is obvious after modification due to the existing equipment, fault and misoperation are avoided, and the operation stability is higher.

Through the direction adaptation effect of mounting groove and base, install the guard box after one side of cabinet door, through the spring action of spacing spring on the different positions, make the both ends that correspond the U-shaped pole on the height can run through the cabinet door and plug in the base, accomplish spacingly to the guard box, when needs take out the guard box, only need open mechanical door lock, and to one side pulling handle, make the U-shaped pole of last lower extreme break away from the limiting displacement to the guard box, thereby realized the convenient dismouting of guard box on the switch board, whole protection device's installation effectiveness has been improved, and simultaneously, nut end equipartition through U-shaped pole and bolt is arranged in the inside of switch board, and then need contact the locking effect back of mechanical door lock, just can operate the position of guard box, thereby play the theftproof guard action to the guard box, whole protection device's practicality has been improved.

Drawings

The accompanying drawings, which are incorporated herein and constitute part of this specification, illustrate embodiments of the disclosure and, together with the description, further serve to explain the principles of the disclosure and to enable a person skilled in the pertinent art to make and use the disclosure.

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic perspective view of the protection box of the present invention;

FIG. 3 is a schematic perspective view of a cabinet door according to the present invention;

FIG. 4 is a schematic perspective view of a part of the cabinet door according to the present invention;

FIG. 5 is a schematic perspective view of the mounting bracket of the present invention;

FIG. 6 is a schematic view of a partially enlarged perspective structure of a cabinet door according to the present invention;

FIG. 7 is a perspective view of a portion of the mounting assembly of the present invention;

fig. 8 is a schematic diagram of a trip execution circuit of the intelligent circuit breaker according to the present invention.

[ reference numerals ]

1. A cabinet door; 2. a protection box; 3. installing a card seat; 4. a threaded sleeve; 5. mounting grooves; 6. a base; 7. an anti-theft hole; 8. an anti-theft slot; 9. a bolt; 10. a limiting hole; 11. a U-shaped rod; 12. a vertical connecting rod; 13. a handle; 14. an anti-slip groove; 15. fixing the disc; 16. a limiting spring; 17. a drop-proof disc; 18. an extension cylinder; 19. preventing the ring from falling off; 20. provided is a mechanical door lock.

As shown, specific structures and devices are labeled in the figures to clearly enable implementation of the structures of the embodiments of the invention, but this is only an illustration and is not intended to limit the invention to the specific structures, devices and environments, and according to specific needs, those skilled in the art can adjust or modify the devices and environments, and the adjusted or modified devices and environments are still included in the scope of the appended claims.

Detailed Description

A motor protection device according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It is also to be noted that, in order to make the embodiments more detailed, the following embodiments are preferred and optimized, and other alternative implementations may be adopted by those skilled in the art; also, the drawings are only for purposes of more particularly describing embodiments and are not intended to limit the invention in any way.

It should be noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the relevant art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

In general, terms may be understood at least in part from the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in the singular or may be used to describe a combination of features, structures, or characteristics in the plural, depending at least in part on the context. Additionally, the term "based on" may be understood as not necessarily intended to convey an exclusive set of factors, but may instead allow for the presence of other factors not necessarily explicitly described, depending at least in part on the context.

It is understood that the meaning of "on 8230; \8230on," \8230, above "and" on 82308230; \823030, above "in the present disclosure should be interpreted in the broadest manner such that" on 8230; \8230above "means not only" directly on "something" but also on "something with the meaning of intervening features or layers therebetween, and" on 8230; \8230on "or" on 8230, above "not only means" on "or" above "something, but also may include the meaning thereof" on "or" above "something with no intervening features or layers therebetween.

Furthermore, spatially relative terms such as "below 823030; below", "lower", "above", "upper" and the like may be used herein for ease of description to describe one element or feature's relationship to another element or feature or features, as illustrated in the figures. Spatially relative terms are intended to encompass different orientations in use or operation of the device in addition to the orientation depicted in the figures. The device may be otherwise oriented and the spatially relative descriptors used herein interpreted accordingly.

As shown in fig. 1 to 8, an embodiment of the present invention provides a motor protection device, including a power distribution cabinet for controlling a high-pressure pump motor to operate, the power distribution cabinet being provided with a cabinet door 1 and a protection box 2 installed at one side of the cabinet door 1, the cabinet door 1 being provided with an intelligent circuit breaker, the protection box 2 being electrically connected to the intelligent circuit breaker, an execution element of the intelligent circuit breaker being a magnetic flux converter with a permanent magnet, the protection box 2 being provided with a plurality of theme menus including a measurement menu, a system parameter setting menu, a protection function setting menu, and a history recording and maintaining menu; still be equipped with the installation component that is used for fixed guard box 2 on cabinet door 1, the installation component includes the installation block 3 with 2 looks adaptations of guard box to and by switch board internally mounted's a plurality of bolts 9, the installation component still includes the U-shaped pole 11 and the spacing spring 16 of installing in switch board inside, the both ends of U-shaped pole 11 all run through cabinet door 1 and cover and establish on guard box 2, in this application, guard box 2 has perfect software and hardware self-checking procedure, the interference killing feature is strong: the non-sinusoidal current noise immunity that the harmonic arouses, the noise immunity of electric current sag and interrupt, fast transient pulse crowd noise immunity, surge noise immunity, electrostatic discharge, radio frequency electromagnetic field radiation noise immunity and radio frequency radiation emission test all pass through GB14048.2 standard's whole experiment, make the whole reliability of thermal power plant high-pressure pump package will be obvious owing to equipment at present after the transformation, operating stability is higher, furthermore, through setting up the installation component, both conveniently install guard box 2 on the switch board fast, must operate again and open behind cabinet door 1, just can remove the fixed action to guard box 2, the theftproof performance of the whole in the use of device has been improved.

Referring to fig. 8, the measuring menu is used for displaying parameters of current I, voltage U, frequency F, electric energy E, power P and harmonic H, the system parameter setting menu includes clock setting, measurement setting, test exit and input I/output O setting functions, and the protection function setting menu includes current protection, voltage protection, load monitoring, other protection, history recording and maintenance menu, which is used for providing current alarm, operation times, contact wear, tripping recording, alarm recording, deflection recording, breaker position and energy storage state information, the above interfaces are all hanzization, which is convenient for setting fixed value and observing operation parameters, especially the history recording and maintenance menu can provide complete accident recall after protection action, is convenient for finding faults, and overcomes the defect that the original intelligent module only uses three groups of signal lamps to display codes, the protection device has perfect software and hardware self-checking programs and strong anti-interference capability: the non-sinusoidal current immunity caused by harmonic wave, the immunity of current sag and interruption, the immunity of fast transient pulse group immunity, the surge immunity, electrostatic discharge, the radio frequency electromagnetic field radiation immunity and the radio frequency radiation emission test all pass all tests of GB14048.2 standard, the whole reliability of the high-voltage pump set of the thermal power plant is obvious after transformation, because the current equipment avoids fault and malfunction, the operation stability is higher, in addition, because the external protection box 2 is not a matched product with the intelligent circuit breaker, the protection box 2 is matched with the circuit breaker wiring, and is simply connected with the circuit breaker operation tripping mechanism, the protection tripping locking and closing can not be reliably realized, if the protection tripping is carried out, if the closing instruction is kept for about 2 seconds, the switching jump can occur, the safety can not meet the requirements, therefore, the circuit breaker must trip through the specialized trip coil driving mechanism of protection, realize the trip to block the closing mechanism of the circuit breaker and report to the police when breaking down, can start again after examining and removing the trouble and resetting through the professional, and then require the executive component of the intellectual circuit breaker to be a magnetic flux converter with permanent magnet, its characteristic is small, the power consumption is low, the tripping force is big, the permanent magnet makes the moving and static iron core keep attracting in normal work, fault signal such as overload, short circuit, earthing, etc. from the mutual inductor, according to the protective characteristic requirement designed in advance, after processing of the microprocessor unit, send trip pulse (negative square wave pulse) of certain width to the coil of the magnetic flux converter, produce the reverse magnetism, counteract the permanent magnetic flux, the moving iron core releases the mechanical energy produced to push the release of the circuit breaker to make the circuit breaker break, refer to the figure 8 specifically, through the above-mentioned transformation, the best fit mode of 2 pulse of protecting box and intelligent circuit breaker mechanism protection tripping coil is sarch out, realize that blocking switch reclosing concurrency alarm signal after protection drive circuit breaker mechanism tripping operation, the security of whole group's equipment has obtained promoting greatly, and has promotional value, moreover, this kind of equipment fixing is convenient, magnetic induction principle is used in the current sampling, the link that bus power failure changed current transformer has been saved, can accomplish the transformation under the condition that does not influence the operation, the stability of the whole operation of high-pressure pump group has been improved, a large amount of similar intelligent circuit breaker overhauls the transformation and has accumulated the experience of practice simultaneously for among the thermal power plant.

As shown in fig. 1-7, an installation clamping seat 3 is attached to one side of a cabinet door 1, and the installation clamping seat 3 is provided with a plurality of uniformly distributed threaded sleeves 4, one side of the cabinet door 1 is provided with a plurality of groups of anti-theft holes 7 and anti-theft grooves 8 corresponding to the positions of the corresponding threaded sleeves 4, one end of a plurality of bolts 9 respectively penetrates through the corresponding anti-theft holes 7 and is sleeved in the corresponding threaded sleeves 4 in a threaded manner, the nut end of each bolt 9 is dragged to be positioned in the corresponding anti-theft groove 8, the installation clamping seat 3 is also provided with an installation groove 5, a protection box 2 is provided with a base 6, the base 6 is slidably sleeved in the installation groove 5, the base 6 and the cabinet door 1 are also provided with a plurality of groups of limiting holes 10 corresponding to the positions, the two ends of the U-shaped rods 11 are respectively slidably sleeved in the two groups of limiting holes 10 positioned at the same height, a same handle vertical connecting rod 12 is connected between the two U-shaped rods 11, and a vertical connecting rod 12 is sleeved with a 13, the handle 13 is provided with an anti-skid groove 14, both ends of the U-shaped rod 11 are fixedly sleeved with a fixed plate 15, a limiting spring 16 is sleeved at one end of the corresponding U-shaped rod 11, both sides of the limiting spring 16 are respectively connected with the cabinet door 1 and the corresponding fixed plate 15, one side of the cabinet door 1 is also provided with an extension cylinder 18 coaxially arranged with the corresponding limiting hole 10, the other ends of the extension cylinders 18 are fixedly sleeved with an anti-drop ring 19, the inner diameter of the anti-drop ring 19 is smaller than that of the corresponding extension cylinder 18, one end of the U-shaped rod 11 is also fixedly sleeved with an anti-drop plate 17 matched with the corresponding anti-drop ring 19, the outer diameter of the anti-drop plate 17 is larger than that of the corresponding anti-drop ring 19, the cabinet door 1 is also provided with a plurality of mechanical door locks 20 matched with the power distribution cabinet, in the application, through the guiding adaptive effect of the installation groove 5 and the base 6, install guard box 2 after one side of cabinet door 1, through spacing spring 16's on the different positions spring effect, make the both ends that correspond U-shaped pole 11 on the height can run through cabinet door 1 and plug in base 6, accomplish spacingly to guard box 2, when needs take out guard box 2, only need open mechanical lock 20, and to one side pulling handle 13, make U-shaped pole 11 of going up the lower extreme break away from the limiting displacement to guard box 2, thereby realized the convenient dismouting of guard box 2 on the switch board, whole protection device's installation effectiveness has been improved, and simultaneously, nut end equipartition through U-shaped pole 11 and bolt 9 is put in the inside of switch board, and then need contact behind the locking effect of mechanical lock 20, just can operate guard box 2's position, thereby play the theftproof guard action to guard box 2, whole protection device's practicality has been improved.

According to the technical scheme provided by the invention, a plurality of different theme menus are arranged in the protective box, so that the software and hardware self-checking program is complete, and the anti-interference capability is strong: the non-sinusoidal current immunity caused by harmonic wave, the immunity of current sag and interruption, the immunity of fast transient pulse group immunity, the surge immunity, electrostatic discharge, the radio frequency electromagnetic field radiation immunity and the radio frequency radiation emission test all pass all tests of GB14048.2 standard, the whole reliability of the high-voltage pump set of the thermal power plant is obvious after transformation, because the existing equipment avoids fault and malfunction, the operation stability is higher, in addition, the execution element of the intelligent circuit breaker is a magnetic flux converter with a permanent magnet, the intelligent circuit breaker is characterized in that the volume is small, the power consumption is low, the tripping force is large, the permanent magnet keeps the moving and static iron core in suction when in normal work, fault signals from overload, short circuit, grounding and the like of the mutual inductor are processed by a microprocessor unit according to the pre-designed protection characteristic requirements, the trip pulse (negative square wave pulse) with a certain width is sent to a coil of a magnetic flux converter to generate reverse magnetism, permanent magnetic flux is counteracted, mechanical energy generated by releasing of a movable iron core pushes a release of a circuit breaker to break the circuit breaker, the specific principle is shown by referring to the attached drawing, through the transformation, the optimal matching mode of the protection box pulse and the intelligent circuit breaker mechanism for protecting the trip coil is discovered, the locking switch is closed again after the protection driving circuit breaker mechanism trips and an alarm signal is sent, the safety of the whole set of equipment is greatly improved, the promotion value is high, the equipment is convenient to install, the magnetic induction principle is used for current sampling, the link of replacing a current transformer in a bus power failure is omitted, the transformation can be completed under the condition that the operation is not influenced, and practical experience is accumulated for overhauling and transforming a large number of similar intelligent circuit breakers in a thermal power plant.

The invention is intended to cover alternatives, modifications, equivalents, and alternatives that may be included within the spirit and scope of the invention. In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, components, circuits, and the like have not been described in detail as not to unnecessarily obscure aspects of the present invention.

Those skilled in the art will appreciate that all or part of the steps in the method for implementing the above embodiments may be implemented by hardware that is instructed by a program, and the program may be stored in a computer-readable storage medium, such as: ROM/RAM, magnetic disk, optical disk, etc.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.

Claims

1. A motor protection device is characterized by comprising a power distribution cabinet for controlling a high-pressure pump motor to operate, wherein a cabinet door and a protection box are arranged on the power distribution cabinet, the protection box is arranged on one side of the cabinet door, an intelligent circuit breaker is arranged in the cabinet door, the protection box is electrically connected with the intelligent circuit breaker, an executing element of the intelligent circuit breaker is a magnetic flux converter with a permanent magnet, and a plurality of theme menus comprising a measurement menu, a system parameter setting menu, a protection function setting menu and a history record and maintenance menu are arranged on the protection box;

the cabinet door is further provided with a mounting assembly used for fixing the protection box, the mounting assembly comprises a mounting clamping seat matched with the protection box and a plurality of bolts mounted inside the power distribution cabinet, the mounting assembly further comprises a U-shaped rod and a limiting spring, the U-shaped rod and the limiting spring are mounted inside the power distribution cabinet, and the two ends of the U-shaped rod penetrate through the cabinet door and are sleeved on the protection box.

2. The motor protection device of claim 1, wherein the measurement menu is configured to display parameters of current I, voltage U, frequency F, power E, power P, and harmonics H, and the system parameter setting menu includes clock setting, measurement setting, test outlet and input I/output O setting functions.

3. The motor protection device of claim 1, wherein the protection function setup menu includes current protection, voltage protection, load monitoring, other protection, and history and maintenance menu for providing current alarms, number of operations, contact wear, trip records, alarm records, shift records, breaker position, and energy storage status information.

4. The motor protection device according to claim 1, wherein the mounting socket is attached to one side of the cabinet door, and a plurality of threaded sleeves are mounted on the mounting socket and distributed uniformly, a plurality of sets of anti-theft holes and anti-theft grooves are formed in one side of the cabinet door and correspond to the threaded sleeves, one end of each of the bolts penetrates through the corresponding anti-theft hole and is sleeved in the corresponding threaded sleeve in a threaded manner, and the end of each of the bolts is pulled to be located in the corresponding anti-theft groove.

5. The motor protection device of claim 4, wherein the mounting seat further defines a mounting groove, the protection box defines a base, and the base is slidably disposed in the mounting groove.

6. The motor protection device according to claim 5, wherein the base and the cabinet door are further provided with a plurality of sets of limiting holes corresponding to each other, and two ends of the U-shaped rod are respectively slidably sleeved in the two sets of limiting holes located at the same height.

7. The motor protector as claimed in claim 6, wherein a vertical link is connected between the two U-shaped rods, a handle is sleeved on the vertical link, and the handle is provided with an anti-slip groove.

8. The motor protection device of claim 7, wherein fixing discs are further fixedly sleeved at both ends of the U-shaped rod, the limiting springs are sleeved at one ends corresponding to the U-shaped rod, and both sides of the limiting springs are respectively connected with the cabinet door and the corresponding fixing discs.

9. The motor protection device according to claim 6, wherein an extension cylinder is mounted on one side of the cabinet door and coaxially disposed with respect to the limiting hole, an anti-slip ring is fixedly sleeved on the other end of each of the extension cylinders, the inner diameter of the anti-slip ring is smaller than that of the corresponding extension cylinder, an anti-slip disc matched with the corresponding anti-slip ring is fixedly sleeved on one end of each of the U-shaped rods, and the outer diameter of the anti-slip disc is larger than that of the corresponding anti-slip ring.

10. The motor protection device of claim 1, wherein the cabinet door is further provided with a plurality of mechanical door locks each adapted to the power distribution cabinet.