CN110223880B - Intelligent circuit breaker handcart - Google Patents
Intelligent circuit breaker handcart Download PDFInfo
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- CN110223880B CN110223880B CN201910671838.6A CN201910671838A CN110223880B CN 110223880 B CN110223880 B CN 110223880B CN 201910671838 A CN201910671838 A CN 201910671838A CN 110223880 B CN110223880 B CN 110223880B
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- circuit breaker
- ring
- extinguishing chamber
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/668—Means for obtaining or monitoring the vacuum
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B11/00—Switchgear having carriage withdrawable for isolation
- H02B11/12—Switchgear having carriage withdrawable for isolation with isolation by horizontal withdrawal
- H02B11/167—Switchgear having carriage withdrawable for isolation with isolation by horizontal withdrawal truck type
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Gas-Insulated Switchgears (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses an intelligent circuit breaker handcart, which comprises an upper contact arm connected with an upper wire outlet seat, a lower contact arm connected with a lower wire outlet seat, a monitoring system and a contact arm measuring annular device, wherein a vacuum arc extinguishing chamber is connected between the upper wire outlet seat and the lower wire outlet seat; the monitoring system is used for monitoring the vacuum degree of the vacuum arc-extinguishing chamber, and the contact arm measuring annular device is used for monitoring current and temperature information of the contact arm. The invention is used for solving the problems that the vacuum degree monitoring operation of the vacuum arc-extinguishing chamber in the high-voltage vacuum circuit breaker is complex and difficult to monitor in real time, the monitoring mode of the contact arm is single, and the temperature measurement result cannot be linked with the current, realizing simple and accurate on-line monitoring of the vacuum degree of the vacuum arc-extinguishing chamber, stably acquiring the real-time monitoring data of the contact arm of the circuit breaker, and facilitating the linkage processing of the temperature and current information.
Description
Technical Field
The invention relates to the field of vacuum circuit breakers, in particular to an intelligent circuit breaker handcart.
Background
The vacuum circuit breaker is a power switching device with high prospect in the low-voltage and medium-voltage fields, and is a switching device with vacuum as insulation and arc extinguishing medium. The gas molecules in the vacuum are very rare, and the probability of collision between electrons and molecules is very low, so the insulating strength of the vacuum circuit breaker is very high. Compared with other types of circuit breakers, the vacuum circuit breaker has the advantages of safety, reliability, long service life, small maintenance workload, no environmental pollution and the like. The breaker body and the frame are fixed on the chassis trolley to form the breaker handcart. Because the handcart cabinet has good interchangeability, the reliability of power supply can be greatly improved. The specific working principle is as follows: after the circuit breaker handcart is pushed to a working position, an operating mechanism drives a vacuum arc-extinguishing chamber to close through an insulating pull rod and other devices, current is introduced through an upper quincuncial contact, flows through an upper wire outlet seat, an upper contact arm and a movable contact and a fixed contact in the inner cavity of the vacuum arc-extinguishing chamber, is fed out to a circuit or equipment through a lower contact arm and a lower quincuncial contact, when a fault trip is encountered or equipment is required to be overhauled by power failure, the operating mechanism acts after receiving a trip command, and drives the vacuum arc-extinguishing chamber to close through the insulating pull rod and other devices, so that the locking of the circuit breaker handcart can be released, and the circuit breaker handcart can be retracted to a test position to complete subsequent work.
The vacuum interrupter is the core part of a vacuum circuit breaker. In order to realize breaking and arc extinction of current, the pressure in the vacuum arc-extinguishing chamber is generally not higher than 10 -2 Pa. Therefore, the vacuum degree is one of the main factors determining the breaking performance of the vacuum interrupter, and the decrease of the vacuum degree directly affects the breaking capacity of the vacuum circuit breaker, and in severe cases, the breaking is completely disabled. Therefore, in the practical application field, there is an urgent need to measure and record the vacuum degree of the vacuum interrupter in operation.
In practical application, the method for testing the vacuum degree of the vacuum arc extinguishing chamber mainly comprises the following steps:
(1) The industrial frequency withstand voltage method comprises the following steps: for the test of not dismantling the explosion chamber, the vacuum degree detection field of the vacuum explosion chamber of the vacuum circuit breaker generally adopts power frequency withstand voltage to send out, namely, two contacts of the vacuum circuit breaker are pulled to a rated distance, the power frequency voltage between the contacts is gradually increased to a specified value, if the withstand voltage is 1min, the vacuum degree can be considered to be qualified, otherwise, the vacuum degree is not qualified. Practice shows that the method for detecting the vacuum degree of the seriously inferior vacuum arc-extinguishing chamber by adopting the power frequency withstand voltage method is a simple, convenient and effective method, but cannot be used for the arc-extinguishing chamber in a critical state. For two or more vacuum interrupters used in series, the industrial frequency withstand voltage method is not suitable for simultaneously checking the vacuum degree of the series arc interrupters. In addition, the industrial frequency test transformer for withstand voltage experiments is large in size, heavy, inconvenient to operate and expensive, and is not configured with the capacity of each power transmission and transformation unit.
(2) The observation method comprises the following steps: since the reduction of the vacuum in the vacuum interrupter is often accompanied by a change in the color of the arc and oxidation of internal parts, the vacuum interrupter can be regularly observed in the glass envelope. The surface color of the parts such as the shielding cover and the like in the normal state should be bright, and blue arc light is emitted when the current is cut off; when the vacuum level is severely reduced, the internal color becomes dull and a dark red arc will be found when the current is turned off. The method is only suitable for occasional qualitative inspection of the glass-shell vacuum arc-extinguishing chamber.
(3) The fire-red method is as follows: the spark tracer is adopted for detection, and the spark tracer is moved along the surface of the arc extinguishing chamber during detection, and different luminous conditions exist inside the arc extinguishing chamber under the action of a high-frequency electric field. The vacuum degree of the vacuum arc-extinguishing chamber is identified according to the color of the emitted light. The method is simple to operate, can only perform qualitative judgment, is suitable for the glass tube vacuum arc-extinguishing chamber, and is easily influenced by human factors.
(4) Getter color change determination: and evaporating a layer of getter on the inner wall of the glass tube during the manufacture of the vacuum arc extinguishing chamber. The getter can adsorb residual gas in the tube to maintain high vacuum on one hand, and can indicate the vacuum degree on the other hand. The maintenance personnel can judge whether the vacuum degree is good or not according to the color change of the getter by naked eyes. Also, this method is only suitable for occasional qualitative checks of glass envelope vacuum interrupters.
(5) Magnetic control discharge method: for vacuum interrupters in the manufacturing process, the vacuum pressure is usually measured with an ionization gauge. When the arc-extinguishing chamber is manufactured, the gauge tube of the vacuum ionization gauge on the arc-extinguishing chamber is removed, and the vacuum degree in the arc-extinguishing chamber is measured by a magnetic control discharge method comprising a cylindrical exciting coil. The magnetic control discharge method is one of the better methods for measuring the vacuum degree of the finished arc extinguishing chamber, and is the only quantitative measurement method with better repeatability at present. The principle is that the contacts of the vacuum arc-extinguishing chamber are pulled apart by a certain distance, a pulse voltage is applied between the contacts so as to generate a strong electric field between the contacts, and an axial strong magnetic field is applied between the contacts of the arc-extinguishing chamber. At this time, electrons in the arc-extinguishing chamber do spiral motion under the combined action of a strong electric field and a magnetic field, collide with residual gas molecules in the arc-extinguishing chamber and ionize, and ionized ions form ion current in the electric field. The ion current is approximately proportional to the residual gas density. Therefore, by measuring the ion current, the vacuum degree in the arc extinguishing chamber can be known. But the magnetic control discharge method cannot realize on-line monitoring.
Besides the common method, the method for detecting the vacuum degree of the vacuum arc extinguishing chamber in the prior art comprises the following steps: high-frequency discharge method, high-frequency current method, coupling capacitance method, electro-optical conversion method, radiation method, and the like. However, the existing vacuum degree measuring methods of the vacuum arc extinguishing chambers are operated only by overhauling staff during overhauling, and automatic on-line monitoring cannot be realized. In the prior art, there are attempts to set a pressure sensing device in a vacuum arc-extinguishing chamber, however, if the pressure sensing device uses a wired mode to transmit signals, the signal line very easily affects the air tightness of the vacuum arc-extinguishing chamber when passing through the vacuum arc-extinguishing chamber, and if the pressure sensing device uses a wireless monitoring (non-contact) mode, the problem of inaccurate measurement exists.
In addition, in the working process of the circuit breaker, if the temperature of the main loop is too high, heating and oxidization can be accelerated, so that phenomena such as melting and falling of a contact finger, burning of a contact, failure of an insulating material and the like are caused, and even combustion and explosion are caused in serious cases. In the prior art, the monitoring mode of the circuit breaker contact arm can only singly measure the temperature, and can not be linked with the specific current, so that the measurement result only has referential property, and the measurement result can not be directly utilized for accurate analysis.
Disclosure of Invention
The invention aims to provide an intelligent circuit breaker handcart, which is used for solving the problems that in the prior art, the vacuum degree monitoring operation of a vacuum arc-extinguishing chamber in a high-voltage vacuum circuit breaker is complex and difficult to monitor in real time, the monitoring mode of a contact arm is single, and a temperature measurement result cannot be linked with the current, realizing simple and accurate on-line monitoring of the vacuum degree of the vacuum arc-extinguishing chamber, stably acquiring real-time monitoring data of the contact arm of the circuit breaker, and facilitating linkage processing of temperature and current information.
The invention is realized by the following technical scheme:
the intelligent circuit breaker handcart comprises an upper contact arm connected with an upper wire outlet seat, a lower contact arm connected with a lower wire outlet seat, a monitoring system and a contact arm measuring annular device, wherein a vacuum arc extinguishing chamber is connected between the upper wire outlet seat and the lower wire outlet seat;
the monitoring system comprises a vacuum balance cavity and an optical fiber, wherein the vacuum balance cavity is separated from the vacuum arc-extinguishing chamber through a balance metal film, one end of the optical fiber is positioned in the vacuum balance cavity, the other end of the optical fiber is connected with a monitoring unit, and the monitoring unit is used for monitoring the light intensity transmitted by the optical fiber;
the contact arm measuring annular device is sleeved on the upper contact arm and/or the lower contact arm and comprises an induction electric ring and a current detection ring, wherein the induction electric ring and the current detection ring are opposite to each other, a central control system is connected between the induction electric ring and the current detection ring, and the contact arm measuring annular device further comprises a temperature sensor which is fixed on one side of the central control system facing the direction of the center of the induction electric ring or the current detection ring; the central control system comprises a power supply module, a wireless communication module and a processing module; the power module is used for receiving the electric energy generated by the induction electric ring and supplying power to the wireless communication module, the processing module and the temperature sensor; the input end of the processing module is connected with the current detection ring and the temperature sensor, and the output end of the processing module is connected with the wireless communication module.
Aiming at the problems that in the prior art, the vacuum degree monitoring operation of a vacuum arc-extinguishing chamber in a high-voltage vacuum circuit breaker is complex and difficult to monitor in real time, the monitoring mode of a contact arm is single, and a temperature measurement result cannot be linked with the current, the invention provides an intelligent circuit breaker handcart.
The monitoring system comprises a vacuum balance cavity, a balance metal film is arranged between the vacuum balance cavity and the vacuum arc-extinguishing chamber, one end of the optical fiber is positioned in the vacuum balance cavity, the other end of the optical fiber is connected with the monitoring unit, and the monitoring unit is used for monitoring the light intensity transmitted by the optical fiber, so that when the vacuum degree in the vacuum arc-extinguishing chamber is kept stable, the balance metal film is kept motionless, and the light intensity transmitted to the monitoring unit through the optical fiber is kept unchanged, namely, the vacuum degree in the vacuum arc-extinguishing chamber can be judged to be good. When the vacuum arc-extinguishing chamber leaks, the vacuum degree reduces, balanced metal film both sides pressure differential changes, and balanced metal film produces deformation under the pressure differential effect, and its reflection to the light must change, and the light intensity that passes to the monitoring unit through optic fibre then changes, can judge that the vacuum arc-extinguishing chamber is likely to reveal promptly, and the monitoring unit can send out the alarm and prompt staff to inspect and confirm. The monitoring system is simple in structure, realizes indirect real-time monitoring on the conditions in the vacuum arc-extinguishing chamber through elastic deformation of the balanced metal film and light intensity change, and solves the problem that in the prior art, a worker is required to check the vacuum degree of the vacuum arc-extinguishing chamber during regular maintenance. In addition, because the optical fiber is the vacuum balance chamber that passes, can not take place any direct contact with vacuum interrupter, consequently compare in prior art and need the mode of transmission signal in the inner wall trompil threading of vacuum interrupter, avoided the interference to vacuum interrupter gas tightness to the stability of optical fiber short distance transmission light is high, can guarantee very good measurement accuracy. In addition, if the light in the vacuum balance cavity is inherently insufficient, the person skilled in the art can flexibly set the light source to provide stable light for the vacuum balance cavity according to the requirement.
The contact arm measuring annular device is sleeved on the upper contact arm and/or the lower contact arm, and the induction electric ring and the current detection ring are annular, so that the contact arm measuring annular device is conveniently sleeved on the contact arm directly. The induction electric loop is used for obtaining induction current, the current detection loop is used for monitoring the current in the circuit breaker contact arm in real time, the central control system is connected between the induction electric loop and the current detection loop, and the central control system firstly plays a role in connection, so that the induction electric loop and the current detection loop are connected into a whole. The central control system faces the fixed temperature sensor at one side of the direction of the center of the induction ring or the current detection ring, namely, the temperature sensor faces the direction of the contact arm of the circuit breaker, and the central control system comprises a power module, a wireless communication module and a processing module, wherein the power module is used for receiving induction current generated by the induction ring and storing the induction current, and the stored electric energy is used for supplying power to the wireless communication module, the processing module and the temperature sensor, so that the automatic work can be stably kept without additional power supply. The input end of the processing module is connected with the current detection ring and the temperature sensor, and the output end of the processing module is connected with the wireless communication module, so that current and temperature information monitored by the current detection ring and the temperature sensor in real time are firstly transmitted to the processing module for processing and then transmitted to the wireless communication module, and the current and temperature information is transmitted outwards by the wireless communication module. The wireless communication module is used for sending signals, and the effects of monitoring and protecting the circuit breaker and the switch equipment in real time can be achieved. According to the circuit breaker contact arm real-time monitoring device, the problem that a circuit breaker contact arm monitoring mode is single, and a temperature measurement result cannot be linked with a current is solved, the circuit breaker contact arm real-time monitoring data are stably obtained, and the purpose of temperature and current information linkage processing is achieved.
The outside of the vacuum arc-extinguishing chamber is provided with a sensing chamber, the balance metal film divides the inside of the sensing chamber into a pressure transmission cavity and a vacuum balance cavity, and the pressure transmission cavity is communicated with the vacuum arc-extinguishing chamber. The sensing bin is preferably integrally formed with the housing of the vacuum interrupter.
The monitoring unit can emit laser, and the laser is transmitted into the vacuum balance cavity through the optical fiber. The monitoring unit stably transmits laser into the vacuum balance cavity through the optical fiber to form a stable light source, and the optical fiber in the scheme is used as a channel for transmitting the light source and feeding back light, so that the monitoring unit can continuously transmit the laser and can transmit the laser intermittently.
The balance metal film is aluminum foil with the surface coated with white paint. The white paint is coated on the surface, so that the surface flatness can be improved, the reflection of light rays is facilitated, and the absorption of the light rays is reduced.
The white paint comprises the following components in parts by weight: 45-50 parts of alkyd resin, 4-6 parts of dispersing agent, 0.2-0.5 part of defoamer, 10-15 parts of zinc sulfide, 10-15 parts of barium sulfate, 25-30 parts of titanium dioxide and 30-40 parts of solvent. Titanium dioxide is used as the main whitening agent, and zinc sulfide and barium sulfate are used as auxiliary whitening agents, so that the obtained paint is ensured to be pure white, the light absorption is further reduced, and more light is reflected. In addition, in this scheme a large amount of titanium dioxide's joining, titanium dioxide exists in white paint with solid particle's form all the time, and the coating can be favorable to the aluminium foil surface to form diffuse reflection after the aluminium foil surface, and under the diffuse reflection condition, can more stable assurance optic fibre when balanced metal film takes place deformation and receive the light of different intensity to avoid balanced metal film to take place under the specular reflection condition, the circumstances that the illumination intensity change of optic fibre department is little appears around the balanced metal film deformation.
The side wall of the vacuum balance cavity is provided with a groove, the groove is separated from the vacuum balance cavity by a transparent piece, and a light source is arranged in the groove. The scheme is another way of providing a light source for the vacuum balance cavity.
Preferably, the transparent member is vacuum glass. The vacuum glass has excellent heat insulation capability, and can prevent heat emitted by the light source from entering the vacuum balance cavity.
An on-line monitoring method for vacuum degree of a high-voltage vacuum circuit breaker comprises the following steps:
(a) The airtight vacuum balance cavity is arranged, so that the vacuum balance cavity and the vacuum arc extinguishing chamber are separated by a balance metal film;
(b) Monitoring the intensity of light in the vacuum balance chamber: if the light intensity in the vacuum balance cavity is kept unchanged, judging that the vacuum arc extinguishing chamber is normal; and if the light intensity in the vacuum balance cavity changes, judging that the vacuum arc extinguishing chamber leaks.
If the vacuum arc-extinguishing chamber leaks, the pressure of the vacuum balance cavity and the vacuum arc-extinguishing chamber is unbalanced, so that the balance metal film deforms, the reflected light intensity of the balance metal film is different before and after deformation, and further whether the vacuum of the arc-extinguishing chamber leaks or not can be monitored in real time.
The intensity of light in the vacuum balance chamber is monitored by an optical fiber inserted into the vacuum balance chamber. The optical fiber has the performances of electromagnetic interference resistance and atomic radiation interference resistance, and has the mechanical properties of thin diameter, soft quality and light weight; and has insulating, non-inductive electrical performance, water resistance, high temperature resistance, corrosion resistance and chemical performance, etc., and can resist the extreme conditions of the vacuum arc-extinguishing chamber.
A light source is provided to the vacuum balance chamber during monitoring. The light source is laser transmitted into the vacuum balance cavity through an optical fiber.
Further, the induction electric ring and the current detection ring are coaxial and are sleeved outside the contact arm; the central control system is connected to the tops of the induction electric ring and the current detection ring, the temperature sensor is arranged on the lower surface of the central control system, and the temperature sensor is contacted with the contact arm of the circuit breaker. The sensing electricity ring is coaxial with the current detection ring, is convenient for ensure that both stable cover simultaneously is on touching the arm, well accuse system connects at sensing electricity ring, current detection ring's top, and temperature sensor sets up at well accuse system's lower surface, and this kind of structure can make under the holistic gravity action of this device, and the temperature sensor of position touching arm top is natural with touching the arm and stable contact.
The induction ring is a current transformer. The current detection loop is a rogowski coil. The processing module is an analog-to-digital converter.
The bottom mounting carrier plate of induction electricity ring or electric current detection ring, the upper surface of carrier plate sets up and touches arm bottom assorted recess with the circuit breaker. The bottom phase-match of recess and circuit breaker touch the arm to for the circuit breaker touches the arm and provides the accommodation groove through the recess, make the circuit breaker touch the bottom of arm and wrap up by the recess, hold the arm by the spandrel board and measure ring device, improve the operating stability who touches the arm and measure ring device.
The opposite sides of the bearing plate are hinged with the clamping plates through hinges, and the clamping plates are connected with the outer walls of the bearing plate through tension springs. When the circuit breaker touches the arm and places in the recess, the grip block of both sides is pulled to the inboard by the extension spring, and then the grip block card is in the both sides that the circuit breaker touched the arm, tightly clamp the circuit breaker by the grip block from both sides to make to touch the arm and measure annular device and touch the arm between static friction force very big, provide this application and touch the relative connection stability between the arm, avoid this application to produce sliding displacement along touching the axial of arm easily, show the stability that improves this application on-line monitoring in-process. The inner side surface of the clamping plate is provided with a plurality of convex teeth. The friction resistance between the clamping plate and the contact arm is improved through the convex teeth, and the use stability of the application is further guaranteed.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the intelligent circuit breaker handcart has the advantages that the structure and the operation of a monitoring system are extremely simple, the condition in a vacuum arc-extinguishing chamber is indirectly monitored in real time by balancing the elastic deformation of a metal film and by means of the change of light intensity, and the problems that in the prior art, a worker is required to check the vacuum degree of the vacuum arc-extinguishing chamber and monitor the vacuum degree in a wireless real-time on-line manner when the worker is required to regularly overhaul are solved.
2. According to the intelligent circuit breaker handcart, the optical fiber passes through the vacuum balance cavity and cannot be in direct contact with the vacuum arc-extinguishing chamber, so that compared with the mode that a signal is required to be transmitted through the hole in the inner wall of the vacuum arc-extinguishing chamber in the prior art, the interference on the air tightness of the vacuum arc-extinguishing chamber is avoided, the stability of light transmitted by the optical fiber in a short distance is extremely high, and very good measurement accuracy can be ensured.
3. According to the intelligent circuit breaker handcart, the contact arm measuring annular device can stably and automatically work, and power supply is not required to be additionally provided. The input end of the processing module is connected with the current detection ring and the temperature sensor, and the output end of the processing module is connected with the wireless communication module, so that current and temperature information monitored by the current detection ring and the temperature sensor in real time are firstly transmitted to the processing module for processing and then transmitted to the wireless communication module, and the current and temperature information is transmitted outwards by the wireless communication module. The wireless communication module is used for transmitting signals, so that the effects of monitoring and protecting the circuit breaker and the switch equipment in real time can be achieved. The contact arm measuring annular device solves the problems that in the prior art, the monitoring mode of a contact arm of a circuit breaker is single, and a temperature measurement result cannot be linked with the current, and achieves the purposes of stably acquiring real-time monitoring data of the contact arm of the circuit breaker and carrying out linkage processing on temperature and current information.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention. In the drawings:
FIG. 1 is a cross-sectional view of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a monitoring system according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a pressure transfer chamber according to an embodiment of the present invention;
FIG. 4 is a schematic view of a contact arm measurement ring device according to an embodiment of the present invention;
FIG. 5 is a side view of a contact arm measurement ring device in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of a central control system connection of a touch arm measurement ring device according to an embodiment of the present invention;
FIG. 7 is a schematic view of a contact arm measurement ring device according to another embodiment of the present invention;
fig. 8 is a partial schematic view of a carrier plate in another embodiment of the invention.
In the drawings, the reference numerals and corresponding part names:
the device comprises a 1-breaker operating mechanism, a 2-vacuum arc-extinguishing chamber, a 3-sensing bin, a 31-balance metal film, a 32-vacuum balance cavity, 33-optical fibers, 34-pressure transmission cavities, 4-monitoring units, 5-first grooves, 6-transparent pieces, 7-light sources, 8-solid sealing polar poles, 9-insulating pull rods, 10-breaker contacts, 11-contact arm measuring annular devices, 111-induction rings, 112-central control systems, 113-temperature sensors, 114-current detection rings, 115-bearing plates, 116-second grooves, 117-clamping plates, 118-tension springs, 12-chassis trucks, 13-frames, 14-upper wire outlet seats, 15-upper contact arms, 16-upper plum blossom contacts, 17-lower wire outlet seats, 18-lower contact arms and 19-lower plum blossom contacts.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Example 1:
an intelligent circuit breaker handcart, as shown in figure 1, comprises an upper contact arm 15 connected with an upper wire outlet seat 14, a lower contact arm 18 connected with a lower wire outlet seat 17, a vacuum arc extinguishing chamber 2 connected between the upper wire outlet seat 14 and the lower wire outlet seat 17, a monitoring system and a contact arm measuring annular device 11;
the monitoring system is shown in fig. 2, and comprises a vacuum balance cavity 32 and an optical fiber 33, wherein the vacuum balance cavity 32 is separated from the vacuum arc extinguishing chamber 2 by a balance metal film 31, one end of the optical fiber 33 is positioned in the vacuum balance cavity 32, the other end of the optical fiber is connected with a monitoring unit 4, and the monitoring unit 4 is used for monitoring the light intensity transmitted by the optical fiber 33;
the contact arm measuring ring device 11 is sleeved on the upper contact arm 15 and the lower contact arm 18, as shown in fig. 4 and 6, and comprises an induction ring 111 and a current detection ring 114, wherein the induction ring 111 and the current detection ring 114 are opposite to each other, a central control system 112 is connected between the induction ring 111 and the current detection ring 114, and a temperature sensor 113 is fixed on one side of the central control system 112 facing the direction of the center of the induction ring 111 or the current detection ring 114; the central control system 112 comprises a power module, a wireless communication module and a processing module; the power module is used for receiving the electric energy generated by the induction electric ring 111 and supplying power to the wireless communication module, the processing module and the temperature sensor 113; the input end of the processing module is connected with the current detection ring 114 and the temperature sensor 113, and the output end of the processing module is connected with the wireless communication module.
In this embodiment, a sensing chamber 3 is disposed outside the vacuum arc-extinguishing chamber 2, the balance metal film 31 divides the inside of the sensing chamber 3 into a pressure transmitting chamber 34 and a vacuum balance chamber 32, and the pressure transmitting chamber 34 is communicated with the vacuum arc-extinguishing chamber 2. The monitoring unit 4 is capable of emitting laser light, which is transmitted into the vacuum balance chamber 32 through an optical fiber 33.
The monitoring unit 4 is connected with an optical fiber 33, the optical fiber 33 is connected with a vacuum balance cavity 32, a balance metal film 31 is arranged in the vacuum arc-extinguishing chamber 2, and the vacuum balance cavity 32 and the vacuum arc-extinguishing chamber 2 are of an integrated structure. The monitoring unit 4 transmits laser light into the vacuum balance cavity 32 through the optical fiber 33, and the balance metal mold 31 can reflect the light. When the vacuum degree of the vacuum arc-extinguishing chamber 2 of the circuit breaker leaks, the pressure of the vacuum arc-extinguishing chamber 2 is larger than the pressure in the vacuum balance cavity 32, so that the balance metal film 31 deforms and the reflection of light changes, the optical fiber 33 transmits the light to the monitoring unit 4, and whether the vacuum arc-extinguishing chamber leaks in vacuum can be judged according to the light intensity curve.
Example 2:
as shown in fig. 3, this embodiment is different from embodiment 1 in that: the side wall of the vacuum balance cavity 32 is provided with a first groove 5, the first groove 5 is separated from the vacuum balance cavity 32 by a transparent piece 6, and a light source 7 is arranged in the first groove 5. The transparent member 6 is vacuum glass.
Preferably, the balance metal film 31 is aluminum foil coated with white paint on the surface. The white paint comprises the following components in parts by weight: 45-50 parts of alkyd resin, 4-6 parts of dispersing agent, 0.2-0.5 part of defoamer, 10-15 parts of zinc sulfide, 10-15 parts of barium sulfate, 25-30 parts of titanium dioxide and 30-40 parts of solvent.
Example 3:
as shown in fig. 7 and 8, the contact arm measuring ring device for a vacuum circuit breaker, based on embodiment 1, the induction ring 111 and the current detecting ring 114 are coaxial and are sleeved outside the upper contact arm 15 and the lower contact arm 18; the central control system 112 is connected to the top of the induction ring 111 and the current detection ring 114, the temperature sensor 113 is disposed on the lower surface of the central control system 112, and the temperature sensor 113 is in contact with the upper contact arm 15 and the lower contact arm 18. The bottom end of the induction electric ring 111 or the current detection ring 114 is fixed with a supporting plate 115, and a second groove 116 matched with the bottoms of the upper contact arm 15 and the lower contact arm 18 is arranged on the upper surface of the supporting plate 115. Opposite sides of the bearing plate 115 are hinged with a clamping plate 117 through hinges, and the clamping plate 117 is connected with the outer wall of the bearing plate 115 through a tension spring 118; the inner side surface of the clamping plate 117 is provided with a plurality of convex teeth.
Wherein, the induction ring 111 is a current transformer; the current detection loop 114 is a rogowski coil; the processing module is an analog-to-digital converter.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (6)
1. The intelligent circuit breaker handcart comprises an upper contact arm (15) connected with an upper wire outlet seat (14), a lower contact arm (18) connected with a lower wire outlet seat (17), and a vacuum arc extinguishing chamber (2) connected between the upper wire outlet seat (14) and the lower wire outlet seat (17), and is characterized by further comprising a monitoring system and a contact arm measuring annular device (11);
the monitoring system comprises a vacuum balance cavity (32) and an optical fiber (33), wherein the vacuum balance cavity (32) is separated from a vacuum arc extinguishing chamber (2) through a balance metal film (31), one end of the optical fiber (33) is positioned in the vacuum balance cavity (32), the other end of the optical fiber is connected with a monitoring unit (4), and the monitoring unit (4) is used for monitoring the light intensity transmitted by the optical fiber (33);
the contact arm measuring annular device (11) is sleeved on the upper contact arm (15) and/or the lower contact arm (18), and comprises an induction electric ring (111) and a current detection ring (114), wherein the induction electric ring (111) and the current detection ring (114) are opposite to each other, a central control system (112) is connected between the induction electric ring (111) and the current detection ring (114), and the contact arm measuring annular device further comprises a temperature sensor (113) which is fixed on one side of the central control system (112) facing the direction of the center of the induction electric ring (111) or the current detection ring (114); the central control system (112) comprises a power supply module, a wireless communication module and a processing module; the power supply module is used for receiving electric energy generated by the induction electric ring (111) and supplying power to the wireless communication module, the processing module and the temperature sensor (113); the input end of the processing module is connected with the current detection ring (114) and the temperature sensor (113), and the output end of the processing module is connected with the wireless communication module;
the induction electric ring (111) is coaxial with the current detection ring (114) and is sleeved outside the upper contact arm (15) and/or the lower contact arm (18); the central control system (112) is connected to the tops of the induction electric ring (111) and the current detection ring (114), the temperature sensor (113) is arranged on the lower surface of the central control system (112), and the temperature sensor (113) is contacted with the upper contact arm (15) and/or the lower contact arm (18);
the induction ring (111) is a current transformer; the current detection loop (114) is a rogowski coil; the processing module is an analog-to-digital converter;
the bottom end of the induction electric ring (111) or the current detection ring (114) is fixed with a bearing plate (115), and a second groove (116) matched with the bottom of the upper contact arm (15) and/or the lower contact arm (18) is arranged on the upper surface of the bearing plate (115);
opposite sides of the bearing plate (115) are hinged with clamping plates (117) through hinges, and the clamping plates (117) are connected with the outer wall of the bearing plate (115) through tension springs (118); the inner side surface of the clamping plate (117) is provided with a plurality of convex teeth.
2. An intelligent circuit breaker handcart according to claim 1, characterized in that a sensing bin (3) is arranged outside the vacuum arc-extinguishing chamber (2), the balance metal film (31) divides the inside of the sensing bin (3) into a pressure transmission cavity (34) and a vacuum balance cavity (32), and the pressure transmission cavity (34) is communicated with the vacuum arc-extinguishing chamber (2).
3. An intelligent circuit breaker trolley according to claim 1, characterized in that the monitoring unit (4) is capable of emitting laser light, which is transmitted into the vacuum balance chamber (32) through an optical fiber (33).
4. An intelligent circuit breaker trolley according to claim 1, characterized in that the balancing metal film (31) is an aluminium foil with a white paint coated on the surface.
5. The intelligent circuit breaker handcart of claim 4, wherein the white paint comprises the following components in parts by weight: 45-50 parts of alkyd resin, 4-6 parts of dispersing agent, 0.2-0.5 part of defoamer, 10-15 parts of zinc sulfide, 10-15 parts of barium sulfate, 25-30 parts of titanium dioxide and 30-40 parts of solvent.
6. An intelligent circuit breaker handcart according to claim 1, characterized in that a first groove (5) is formed in the side wall of the vacuum balance cavity (32), the first groove (5) is separated from the vacuum balance cavity (32) by a transparent piece (6), and a light source (7) is arranged in the first groove (5).
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