CN111336943A - Detection system for meshing depth of moving and static contacts of handcart circuit breaker of centrally installed switchgear - Google Patents
Detection system for meshing depth of moving and static contacts of handcart circuit breaker of centrally installed switchgear Download PDFInfo
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- CN111336943A CN111336943A CN202010256102.5A CN202010256102A CN111336943A CN 111336943 A CN111336943 A CN 111336943A CN 202010256102 A CN202010256102 A CN 202010256102A CN 111336943 A CN111336943 A CN 111336943A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/22—Measuring arrangements characterised by the use of optical techniques for measuring depth
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Abstract
The invention relates to a data management system, in particular to a detection system for the meshing depth of moving and static contacts of a handcart circuit breaker of a centrally installed switchgear, which comprises a distance measurement unit for detecting the meshing depth of the moving and static contacts, a signal amplification unit connected with a main controller and used for amplifying output signals of the distance measurement unit, and a human-computer interaction unit connected with the main controller and used for human-computer interaction, wherein the distance measurement unit comprises a laser displacement sensor for detecting the meshing depth of the moving and static contacts and an analog-to-digital conversion module for performing analog-to-digital conversion on the output signals of the laser displacement sensor and sending the output signals to the signal amplification unit, and the signal amplification unit is a combined amplifier consisting of an operational amplifier and outputting signals from both ends and inputting from both ends; the technical scheme provided by the invention can effectively overcome the defects of low detection efficiency and large measurement error in the prior art.
Description
Technical Field
The invention relates to a data management system, in particular to a detection system for the meshing depth of moving and static contacts of a handcart circuit breaker of a centrally installed switchgear.
Background
In recent years, the middle-placed switch cabinet is widely applied to a medium-high voltage switch cabinet by virtue of excellent five-prevention devices and grounding switch locking devices of the middle-placed switch cabinet. With the acceleration of the operation of new station equipment and the transformation of old equipment, the centrally installed switchgear becomes the mainstream choice of 10kV and 35kV switch cabinets, and is the cabinet type with the largest quantity and the largest maintenance workload in the power grid operation equipment. In the operation process of the equipment, once the contact resistance of the moving and static contacts of the handcart is overlarge, the contacts are overheated, so that the insulation aging is caused, the service life of the cabinet body is influenced, and the explosion is generated to influence the life and property safety.
In practical use, the heating condition can occur when the upper side of the plum blossom contact of the circuit breaker in the switch cabinet is in poor contact with the fixed contact, and finally the plum blossom contact is developed to carry out arc discharge on the fixed contact, so that the copper contact finger of the vacuum circuit breaker is seriously burnt, the heat dissipation part is melted, the fixed contact box is burnt out, a large amount of smoke containing metal ions and carbon compounds is generated, and the three-phase short circuit of the bus is caused.
There are many factors that affect the contact resistance, and it is difficult to accurately calculate the contact resistance. In the actual use and the test process, after the circuit breaker handcart plum blossom contact is inserted into the internal static contact of cabinet a certain degree of depth, because the radial dimension of static contact is bigger than the plum blossom contact, the spring staple bolt will warp and produce the pressure effect, ensures reliable contact. Therefore, the contact resistance value can be ensured only by ensuring enough engagement depth between the handcart moving contact and the fixed contact in the cabinet body.
Therefore, the meshing depth of the handcart moving contact and the static contact must be detected in the actual delivery test of the centrally installed switchgear, and L is regulated to be more than or equal to 15mm and less than or equal to 25mm, so that the moving contact and the static contact have enough meshing depth, and the overheating fault of the centrally installed switchgear handcart moving contact caused by insufficient contact stroke of the moving contact is prevented. The detection method generally implemented at present is a method for measuring scratches by coating vaseline, and the method has the advantages of low cost, simple principle, more time consumption, low efficiency and measurement error in the actual implementation process.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects in the prior art, the invention provides a detection system for the meshing depth of the moving contact and the static contact of the handcart circuit breaker of the centrally installed switchgear, which can effectively overcome the defects of low detection efficiency and large measurement error in the prior art.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
a detection system for the meshing depth of a moving contact and a static contact of a handcart circuit breaker of a centrally installed switchgear comprises a distance measurement unit for detecting the meshing depth of the moving contact and the static contact, a signal amplification unit connected with a main controller and used for amplifying an output signal of the distance measurement unit, and a human-computer interaction unit connected with the main controller and used for human-computer interaction;
the distance measurement unit comprises a laser displacement sensor for detecting the engagement depth of the moving contact and the static contact and an analog-to-digital conversion module for performing analog-to-digital conversion on an output signal of the laser displacement sensor and sending the output signal to the signal amplification unit, and the signal amplification unit is a combined amplifier composed of an operational amplifier and having double ends output and double ends input.
Preferably, the occlusion depth of the movable and stationary contacts is detected by the laser displacement sensor by adopting a diffusion reflection type laser ranging method.
Preferably, the signal amplification unit includes a program control module, a first-stage amplification module connected to the program control module and configured to receive an output signal of the analog-to-digital conversion module, and a second-stage amplification module connected to the first-stage amplification module and the main controller.
Preferably, the signal amplification unit adopts an inverting amplification circuit, and the input part of the signal amplification unit is connected in series with a coupling capacitor to suppress noise.
Preferably, the signal amplification factor of the signal amplification unit is controlled by accessing different resistors to the first-stage amplification module through the program control module.
Preferably, the programmable control module selects different resistors to be connected into the first-stage amplification module by controlling a DIP6 coding switch.
Preferably, the main controller adopts a digital signal processing chip DSP, and the signal amplification unit adopts a dual power supply for power supply.
Preferably, decoupling capacitors are connected in parallel beside the dual power supply pins.
Preferably, the human-computer interaction unit includes a main control chip, an information display circuit connected to the main control chip for displaying the working state of the system and checking the detection data, an independent key circuit connected to the main control chip for inputting data parameters, a storage circuit connected to the main control chip for storing the detection data, and a serial communication circuit connected to the main control chip for data communication with the outside.
Preferably, the information display circuit is connected with the liquid crystal screen and the LED lamp, the storage circuit is connected with the off-chip RAM, the serial off-chip Flash, the DS1302 and the AT24C64, and the serial port communication circuit is connected with the UART and the I/O module;
the independent key circuit is connected with the independent keyboard, and each key on the independent keyboard is connected with a capacitor in parallel for hardware debouncing.
(III) advantageous effects
Compared with the prior art, the detection system for the meshing depth of the moving contact and the static contact of the handcart circuit breaker of the centrally installed switchgear, provided by the invention, has the following beneficial effects:
1. the distance measuring unit is used for detecting the meshing depth of the movable contact and the fixed contact, the signal amplifying unit is used for amplifying an output signal of the distance measuring unit, and finally the human-computer interaction unit is used for displaying detection data, so that the whole detection process is high in speed and efficiency;
2. the detection of the meshing depth of the movable contact and the fixed contact is realized by means of a laser displacement sensor by adopting a diffusion reflection type laser ranging method, so that the detection error is small, the signal amplification unit adopts an inverse amplification circuit, the input part is connected in series with a coupling capacitor to remove direct current quantity, the anti-interference capability is strong, the noise can be effectively inhibited, and the detection precision can be effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic diagram of the signal amplification unit system of FIG. 1 according to the present invention;
FIG. 3 is a schematic diagram of a human-computer interaction unit system according to the present invention;
FIG. 4 is a schematic diagram of an information display circuit in the human-computer interaction unit according to the present invention;
FIG. 5 is a schematic diagram of an independent key circuit in the human-computer interaction unit according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A detection system for the meshing depth of a moving contact and a static contact of a handcart circuit breaker of a centrally installed switchgear comprises a distance measurement unit for detecting the meshing depth of the moving contact and the static contact, a signal amplification unit connected with a main controller and used for amplifying an output signal of the distance measurement unit, and a human-computer interaction unit connected with the main controller and used for human-computer interaction;
the distance measurement unit comprises a laser displacement sensor for detecting the engagement depth of the moving contact and the static contact and an analog-to-digital conversion module for performing analog-to-digital conversion on an output signal of the laser displacement sensor and sending the output signal to the signal amplification unit, and the signal amplification unit is a combined amplifier composed of an operational amplifier and having two ends output and two ends input.
The distance measuring unit is used for detecting the meshing depth of the movable contact and the fixed contact, the output signal of the distance measuring unit is amplified by the signal amplifying unit, and finally the detection data is displayed through the man-machine interaction unit.
And detecting the occlusion depth of the movable contact and the fixed contact by using a laser displacement sensor by adopting a diffusion reflection type laser ranging method. The detection of the occlusion depth of the movable contact and the fixed contact is carried out by a laser displacement sensor by adopting a diffusion reflection type laser ranging method, so that the detection error is small.
As shown in fig. 2, the signal amplifying unit includes a program control module, a first-stage amplifying module connected to the program control module for receiving an output signal of the analog-to-digital conversion module, and a second-stage amplifying module connected to the first-stage amplifying module and the main controller.
The signal amplification unit adopts an inverting amplification circuit, and the input part of the signal amplification unit is connected in series with a coupling capacitor to suppress noise.
The signal amplification times of the signal amplification unit are controlled by connecting different resistors to the first-stage amplification module through the program control module.
The program control module selects different resistors to be connected into the first-stage amplification module by controlling the DIP6 coding switch.
The main controller adopts a digital signal processing chip DSP, and the signal amplification unit adopts a dual power supply for power supply.
Decoupling capacitors are connected in parallel beside the pins of the double power supplies, so that noise voltage on the power supply can be introduced to the ground, the power supply voltage is kept at a stable value, and the system can stably work. The decoupling capacitor is connected in parallel with a small capacitor by a large capacitor, and the decoupling capacitor is placed beside an operational amplifier power supply pin as much as possible during layout.
The signal amplification unit adopts an inverse amplification circuit, the input part is connected in series with a coupling capacitor to remove direct current, the anti-interference capability is strong, noise can be effectively inhibited, and therefore the detection precision can be effectively improved.
The amplification factor of the signal amplification unit can be conveniently changed by adjusting the resistance value of the feedback network, and the circuit structure is simpler. The first-stage amplification module is combined with the program control module and is a gain-controllable inverting amplifier, the amplification factor of the first-stage amplification module can be controlled by connecting different resistors to the first-stage amplification module through the program control module, and the amplification factor of the second-stage amplification module is about 10 times.
As shown in fig. 3 to 5, the human-computer interaction unit includes a main control chip, an information display circuit connected to the main control chip for displaying the operating state of the system and checking the detection data, an independent key circuit connected to the main control chip for inputting data parameters, a storage circuit connected to the main control chip for storing the detection data, and a serial communication circuit connected to the main control chip for performing data communication with the outside.
The information display circuit is connected with the liquid crystal screen and the LED lamp, the storage circuit is connected with the off-chip RAM, the serial off-chip Flash, the DS1302 and the AT24C64, and the serial port communication circuit is connected with the UART and the I/O module;
the independent key circuit is connected with the independent keyboard, and each key on the independent keyboard is connected with a capacitor in parallel for hardware debouncing.
A main control chip of the man-machine interaction unit adopts a P89C664 singlechip, belongs to an enhanced 51 singlechip, can work in a 6-clock period mode, and comprises a 2K RAM, a 64K Flash, 8 interrupt sources, a four-level interrupt priority and a full-duplex enhanced UART.
The information display circuit displays text information by a 320x240 large-screen dot matrix liquid crystal. The memory circuit comprises an off-chip RAM, a serial off-chip Flash, an AT24C64 and a DS1302, and provides rich data storage space and a clock for a circuit minimum system, so that the programming is more reliable.
The keyboard adopts an independent key circuit, the configuration is flexible, the working states of all keys are not affected mutually, and the identification of the keys is simple. In the technical scheme of the application, 9 keys are tried, wherein K1-K8 is expanded through 74LV245 by a P0 port, K9 is independently connected to P1.3 of a P89C664 singlechip, and a method for connecting the keys with capacitors in parallel (hardware debounce) is tried, so that the singlechip is ensured to correctly read the key values.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. The utility model provides a detecting system that is used for in put cabinet handcart circuit breaker sound contact interlock degree of depth which characterized in that: the device comprises a distance measuring unit for detecting the occlusion depth of a moving contact and a static contact, a signal amplifying unit connected with a main controller and used for amplifying an output signal of the distance measuring unit, and a human-computer interaction unit connected with the main controller and used for human-computer interaction;
the distance measurement unit comprises a laser displacement sensor for detecting the engagement depth of the moving contact and the static contact and an analog-to-digital conversion module for performing analog-to-digital conversion on an output signal of the laser displacement sensor and sending the output signal to the signal amplification unit, and the signal amplification unit is a combined amplifier composed of an operational amplifier and having double ends output and double ends input.
2. The system for detecting the meshing depth of the moving and static contacts of the centrally installed switchgear handcart circuit breaker according to claim 1, is characterized in that: and detecting the occlusion depth of the movable contact and the fixed contact by using a diffusion reflection type laser ranging method and the laser displacement sensor.
3. The system for detecting the meshing depth of the moving and static contacts of the centrally installed switchgear handcart circuit breaker according to claim 1, is characterized in that: the signal amplification unit comprises a program control module, a first-stage amplification module connected with the program control module and used for receiving an output signal of the analog-to-digital conversion module, and a second-stage amplification module connected with the first-stage amplification module and the main controller.
4. The system for detecting the meshing depth of the moving and static contacts of the centrally installed switchgear handcart circuit breaker according to claim 3, is characterized in that: the signal amplification unit adopts an inverting amplification circuit, and the input part of the signal amplification unit is connected in series with a coupling capacitor to suppress noise.
5. The system for detecting the meshing depth of the moving and static contacts of the centrally installed switchgear handcart circuit breaker according to claim 4, is characterized in that: and the signal amplification times of the signal amplification unit are controlled by accessing different resistors to the first-stage amplification module through the program control module.
6. The system for detecting the meshing depth of the moving and static contacts of the centrally installed switchgear handcart circuit breaker according to claim 5, is characterized in that: the program control module selects different resistors to be connected into the first-stage amplification module by controlling the DIP6 coding switch.
7. The system for detecting the meshing depth of the moving and static contacts of the centrally installed switchgear handcart circuit breaker according to claim 3, is characterized in that: the main controller adopts a digital signal processing chip DSP, and the signal amplification unit adopts a dual power supply for power supply.
8. The system for detecting the meshing depth of the moving and static contacts of the centrally installed switchgear handcart circuit breaker according to claim 7, is characterized in that: decoupling capacitors are connected in parallel beside the dual-power supply pins.
9. The system for detecting the meshing depth of the moving and static contacts of the centrally installed switchgear handcart circuit breaker according to claim 1, is characterized in that: the man-machine interaction unit comprises a main control chip, an information display circuit, an independent key circuit, a storage circuit and a serial port communication circuit, wherein the information display circuit is connected with the main control chip and used for displaying the working state of the system and checking the detection data, the independent key circuit is connected with the main control chip and used for inputting data parameters, the storage circuit is connected with the main control chip and used for storing the detection data, and the serial port communication circuit is connected with the main control chip and used for carrying out data communication with the outside.
10. The system for detecting the meshing depth of the moving and static contacts of the centrally installed switchgear handcart circuit breaker according to claim 9, is characterized in that: the information display circuit is connected with the liquid crystal screen and the LED lamp, the storage circuit is connected with the off-chip RAM, the serial off-chip Flash, the DS1302 and the AT24C64, and the serial port communication circuit is connected with the UART and the I/O module;
the independent key circuit is connected with the independent keyboard, and each key on the independent keyboard is connected with a capacitor in parallel for hardware debouncing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010256102.5A CN111336943A (en) | 2020-04-02 | 2020-04-02 | Detection system for meshing depth of moving and static contacts of handcart circuit breaker of centrally installed switchgear |
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| CN202010256102.5A CN111336943A (en) | 2020-04-02 | 2020-04-02 | Detection system for meshing depth of moving and static contacts of handcart circuit breaker of centrally installed switchgear |
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| CN111336943A true CN111336943A (en) | 2020-06-26 |
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| CN202010256102.5A Pending CN111336943A (en) | 2020-04-02 | 2020-04-02 | Detection system for meshing depth of moving and static contacts of handcart circuit breaker of centrally installed switchgear |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112532186A (en) * | 2020-11-04 | 2021-03-19 | 杭州爱华仪器有限公司 | Measuring amplifier for audio signal measurement |
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