CN111610467A - Switch cabinet capable of automatically detecting contact engagement state and detection method thereof - Google Patents

Switch cabinet capable of automatically detecting contact engagement state and detection method thereof Download PDF

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Publication number
CN111610467A
CN111610467A CN202010423170.6A CN202010423170A CN111610467A CN 111610467 A CN111610467 A CN 111610467A CN 202010423170 A CN202010423170 A CN 202010423170A CN 111610467 A CN111610467 A CN 111610467A
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CN
China
Prior art keywords
contact
engagement state
magnetic induction
switch cabinet
automatically detecting
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Granted
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CN202010423170.6A
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Chinese (zh)
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CN111610467B (en
Inventor
罗建勤
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Shanghai Shuying Technology Co ltd
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Shanghai Shuying Technology Co ltd
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Priority to CN202010423170.6A priority Critical patent/CN111610467B/en
Publication of CN111610467A publication Critical patent/CN111610467A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • 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
    • H02B11/02—Details
    • H02B11/04—Isolating-contacts, e.g. mountings or shieldings
    • 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
    • H02B11/02—Details
    • H02B11/10—Indicating electrical condition of gear; Arrangement of test sockets
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

The invention discloses a switch cabinet for automatically detecting the engagement state of a contact and a detection method thereof, wherein the switch cabinet comprises a cabinet body, a circuit breaker handcart, a cable chamber, a measurement and control chamber and a magnetic displacement sensing module; the measurement and control room comprises a signal processing unit and a display unit; the circuit breaker handcart comprises a contact arm; one end of the contact arm is provided with a moving contact; the cable compartment includes a terminal; the wiring terminal is provided with a static contact which is arranged opposite to the moving contact; the magnetic displacement sensing module is arranged below the static contact and used for detecting the magnetic induction intensity; the signal processing unit is used for receiving the magnetic induction intensity, calculating displacement data according to the magnetic induction intensity, and judging whether the displacement data is smaller than a preset value or not so as to output the meshing state information of the moving contact and the static contact; the display unit is connected with the signal processing unit and used for displaying displacement data and the meshing state information of the moving contact and the static contact. According to the invention, the automatic detection of the engagement of the moving contact and the static contact of the circuit breaker is realized through the magnetic displacement sensing module, the operation reliability of the switch cabinet is improved, and the installation and the maintenance are convenient.

Description

Switch cabinet capable of automatically detecting contact engagement state and detection method thereof
Technical Field
The invention relates to the technical field of high-voltage electric appliances of an electric power system, in particular to a switch cabinet capable of automatically detecting the engagement state of a contact and a detection method thereof.
Background
The switch cabinet is mainly used for controlling and protecting a power system, namely, a part of power equipment can be put into or quit operation according to the operation requirement of a power grid, and a fault part can be quickly cut off from the power grid when the power equipment or a line has a fault, so that the normal operation of the fault-free part in the power grid and the safety of equipment maintenance personnel are ensured.
At present, in an electric power system, a metal-clad withdrawable switchgear mostly adopts a combination of a handcart type and a movable type. When the metal armored movable-type cabinet body is movably combined with a circuit breaker, the movable and static contacts of the switch must be tightly meshed, otherwise, the problems of overhigh loop internal resistance, cabinet body heating, overhigh temperature rise and the like can be easily caused due to poor contact, so that the operation reliability of the switch equipment is influenced.
Whether the moving contact and the static contact of the existing switch are tightly engaged is judged mainly through human experience, the judging mode is unreliable and inaccurate, and the engaging state of the moving contact and the static contact cannot be displayed and fed back, so that the installation and the maintenance of field workers are inconvenient.
Disclosure of Invention
The invention aims to solve the problem of how to automatically detect the engagement state of the moving contact and the fixed contact of the switch in the switch cabinet, thereby greatly facilitating the installation and the maintenance of field workers.
In order to solve the above technical problem, one aspect of the present invention discloses a switch cabinet for automatically detecting an engagement state of contacts, comprising: the device comprises a cabinet body, a circuit breaker handcart, a cable chamber, a measurement and control chamber and a magnetic displacement sensing module;
the measurement and control chamber comprises a signal processing unit and a display unit, and is arranged on the upper part of the front surface of the cabinet body;
the circuit breaker handcart comprises a contact arm and is arranged in the middle of the front side of the cabinet body;
one end of the contact arm is provided with a moving contact;
the cable chamber comprises a wiring end and is arranged at the upper part of the back surface of the cabinet body;
the wiring terminal is provided with a static contact which is arranged opposite to the moving contact;
the magnetic displacement sensing module is arranged below the static contact and used for detecting the magnetic induction intensity;
the signal processing unit is used for receiving the magnetic induction intensity, calculating displacement data according to the magnetic induction intensity, and judging whether the displacement data is smaller than a preset value or not so as to output the meshing state information of the moving contact and the static contact;
the display unit is connected with the signal processing unit and used for displaying the displacement data and the meshing state information of the moving contact and the static contact.
Optionally, the magnetic displacement sensing module includes a permanent magnet with an opening, a first coil, a second coil, a power supply unit, a wireless module, and a processing unit;
the first coil and the second coil are respectively wound on the permanent magnet;
one end of the power supply unit is connected with the second end of the first coil, and the other end of the power supply unit is connected with the second end of the second coil;
the input end of the processing unit is respectively connected with the first end of the first coil and the first end of the second coil;
the wireless module is connected with the processing unit.
Optionally, the relationship between the displacement data and the magnetic induction intensity is s- α B-β+γ0；
Wherein s is the displacement data, B is magnetic induction, alpha is a first fitting coefficient, beta is a second fitting coefficient, and gamma 0 is an initial displacement parameter.
Optionally, the first fitting coefficient α is 500-; the second fitting coefficient beta is 0.01-0.025.
Optionally, the circuit breaker trolley comprises a guide rail;
the guide rail set up in the below of circuit breaker handcart.
Optionally, when the displacement data is smaller than the preset value, the engagement state information of the moving contact and the stationary contact is engagement success information.
Optionally, the display unit is configured to display the displacement data and the engagement success information.
Optionally, the measurement and control room further includes a voice module;
the voice module is connected with the signal processing unit and used for sending out prompt tone according to the meshing success information.
Optionally, the system further comprises a voltage transformer handcart;
the voltage transformer handcart is arranged on the lower portion of the front face of the cabinet body.
Optionally, the wall bushing is further included;
the wall bushing is arranged at the middle upper part of the back surface of the cabinet body;
the wall bushing is used for penetrating through a bus bar so that the bus bar is connected with the terminal.
The invention also discloses a detection method for automatically detecting the engagement state of the contact, which is applied to the switch cabinet for automatically detecting the engagement state of the contact and comprises the following steps:
detecting the magnetic induction intensity through the magnetic displacement sensing module;
acquiring the magnetic induction intensity, calculating displacement data according to the magnetic induction intensity, and judging whether the displacement data is smaller than a preset value or not so as to output the meshing state information of the moving contact and the static contact;
and displaying the displacement data and the engagement state information of the moving contact and the static contact.
By adopting the technical scheme, the invention has the following beneficial effects:
1) the magnetic displacement sensing module is arranged below a fixed contact of the circuit breaker to detect the magnetic induction intensity, and the signal processing unit arranged in the measurement and control room is used for calculating displacement data according to the magnetic induction intensity and judging whether the displacement data is smaller than a preset value or not so as to output the meshing state information of the movable contact and the fixed contact;
2) displacement data and meshing state information of the movable and fixed contacts are displayed through a display unit arranged in the measurement and control chamber, and when the meshing state information of the movable and fixed contacts is meshing success information, meshing success is displayed, so that a worker can stop pushing of a circuit breaker handcart;
3) the voice module arranged in the measurement and control chamber sends out prompt sound when the meshing state information of the moving contact and the static contact is successful in meshing so that the working personnel can stop pushing the circuit breaker handcart.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a switch cabinet for automatically detecting an engagement state of contacts according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a magnetic displacement sensing module according to an embodiment of the present invention;
fig. 3 is a flowchart of a detection method for automatically detecting a contact engagement state according to an embodiment of the present invention.
The following is a supplementary description of the drawings:
1-a cabinet body; 2-a circuit breaker handcart; 21-moving contact; 22-a guide rail; 3-a voltage transformer handcart; 4-an electrical room; 5-a cable chamber; 6-wall bushing; 7-static contact; 8-a magnetic displacement sensing module; 81-permanent magnet; 82-a first coil; 83-a second coil; 84-a wireless module; 85-a processing unit; 86-a power supply unit; 9-a measurement and control chamber; s01, S02, S03.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.
As shown in fig. 1, the switch cabinet for automatically detecting the contact engagement state in this embodiment includes a cabinet body 1, a circuit breaker handcart 2, a cable chamber 5, a measurement and control chamber 9 and a magnetic displacement sensing module 8, wherein the cabinet body may be, but is not limited to, a standard KYNA28-12 cabinet body;
the measurement and control chamber 9 comprises a signal processing unit (not shown in the figure) and a display unit (not shown in the figure), and the measurement and control chamber 9 is arranged on the upper part of the front surface of the cabinet body 1;
the circuit breaker handcart 2 comprises a contact arm, and the circuit breaker handcart 2 is arranged in the middle of the front face of the cabinet body 1;
one end of the contact arm is provided with a movable contact 21;
the cable chamber 5 comprises a wiring end, and the cable chamber 5 is arranged at the upper part of the back surface of the cabinet body 1, wherein the cable chamber 5 is mainly used for connecting cables or copper bars in the switch cabinet;
the wiring terminal is provided with a static contact 7 which is arranged opposite to the moving contact 21; it should be noted that the moving contact 21 and the static contact 7 are two contacts of the circuit breaker, when the moving contact 21 and the static contact 7 are engaged, the circuit breaker is closed, and when the moving contact 21 and the static contact 7 are separated, the circuit breaker is opened;
the magnetic displacement sensing module 8 is disposed below the fixed contact 7, and may be but not limited to being directly below the fixed contact 7, and is configured to detect magnetic induction intensity, where the magnetic induction intensity B is related to an air gap at an opening of a permanent magnet of the magnetic displacement sensor 8, and the size of the air gap is related to the engagement depth of the movable contact 21 and the fixed contact 7, and when the engagement depth of the movable contact 21 and the fixed contact 7 is larger, the air gap is smaller, the magnetic induction intensity B is larger, and when the engagement depth of the movable contact 21 and the fixed contact 7 is smaller, the air gap is larger, and the magnetic;
the signal processing unit is used for receiving the magnetic induction B, calculating displacement data according to the magnetic induction B and judging whether the displacement data is smaller than a preset value S0To output the engagement state information of the moving and stationary contacts, wherein S0The displacement data is the displacement data when the magnetic induction intensity B is basically unchanged. In this embodiment, it can be considered that, but is not limited to, the magnetic induction B does not change substantially in amplitude by more than 5% in 5 consecutive sampling periods;
the display unit is connected with the signal processing unit and used for displaying the displacement data and the meshing state information of the moving contact and the static contact.
In the above technical solution, the magnetic induction B detected by the magnetic displacement sensing module 8 changes as the moving contact 21 gradually approaches the stationary contact 7, and when the moving contact 21 and the stationary contact 7 are completely engaged, the magnetic induction B detected by the magnetic displacement sensing module 8 reaches the limit value. The magnetic displacement sensing module 8 can detect the engagement state of the moving contact 21 and the static contact 7 in real time, and can display the engagement state information of the moving contact and the static contact through the display unit of the measurement and control chamber 9, thereby greatly facilitating the installation and the maintenance of field personnel.
Further, when the signal processing unit judges that the displacement data is smaller than a preset value S0When the moving contact and the static contact are meshed, the output meshing state information of the moving contact and the static contact is meshing success information, and at the moment, the display unit displays the displacement dataAnd the engagement success information; when the signal processing unit judges that the displacement data is greater than or equal to a preset value S0And outputting the meshing state information of the moving contact and the static contact as the information of unsuccessful meshing. Whether field workers need to continuously push the circuit breaker handcart 2 or not is prompted through the meshing success information and the meshing failure information displayed by the display unit, and specifically, when the display unit displays the meshing success information, the field workers stop guiding the circuit breaker handcart 2 into the cabinet body 1 in a manual or electric mode; when the display unit shows the information that the meshing is unsuccessful, the field worker continuously guides the circuit breaker handcart 2 into the cabinet body 1 in a manual or electric mode, and great convenience is brought to installation and maintenance.
Further, the measurement and control room 9 further comprises a voice module (not shown in the figure);
the voice module is connected with the signal processing unit and used for sending out prompt tone, and specifically, when the signal processing unit judges that the displacement data is smaller than a preset value S0When the circuit breaker handcart 2 is led into the cabinet body 1, the signal processing unit outputs the meshing state information of the moving contact and the static contact, the voice module sends out prompt sound according to the meshing success information, so that field workers know that the moving contact 21 and the static contact 7 are completely meshed, and the circuit breaker handcart 2 is stopped to be led into the cabinet body 1, and the circuit breaker handcart 2 is greatly convenient to install and maintain.
Further, the circuit breaker trolley 2 comprises a guide rail 22;
guide rail 22 set up in circuit breaker handcart 2's below, field personnel can utilize guide rail 22 to withdraw from circuit breaker handcart 2 to the cabinet body 1 outside in with the leading-in cabinet body 1 of circuit breaker handcart 2 or with circuit breaker handcart 2, convenient operation.
Further, the circuit breaker handcart 2 further comprises a circuit breaker, such as an indoor fixed-pole three-phase circuit breaker, wherein the movable contact 21 is connected with the circuit breaker through a contact arm.
Further, the switch cabinet also comprises a voltage transformer handcart 3, namely a PT handcart; the voltage transformer handcart 3 is arranged on the lower portion of the front face of the cabinet body 1, and the voltage transformer handcart 3 further comprises a grounding switch.
Further, the wall bushing 6 is also included;
the wall bushing 6 is arranged at the middle upper part of the back surface of the cabinet body 1;
the wall bushing 6 is used to pass through a bus bar so that the bus bar is connected to the terminal.
It should be noted that the wall bushing 6, the wiring terminal, the fixed contact 7 and the magnetic displacement sensing module 8 are all disposed in the electrical room 4, and the electrical room 4 is located at the middle upper portion of the back of the cabinet body 1; the three-phase bus, for example, 10KV, enters the cabinet body 1 through the wall bushing 6, is connected to the terminal of the cable, and then is connected to the fixed contact 7 of the circuit breaker, and finally is connected to the grounding switch of the voltage transformer handcart 3, so as to realize the electrical connection in the switch cabinet, and the circuit breaker in the switch cabinet is in a closed state only when the movable contact 21 is completely engaged with the fixed contact 7, and the circuit breaker in the switch cabinet is in an open state when the movable contact 21 is separated from the fixed contact 7, thereby realizing the switching function.
As shown in fig. 2, the present invention provides a magnetic displacement sensing module 8, which comprises a permanent magnet 81 having an opening, such as a circular ring with an opening, wherein the air gap at the opening may be, but is not limited to, 10-25mm, a first coil 82, a second coil 83, a power supply unit 86, a wireless module 84 and a processing unit 85;
the first coil 82 and the second coil 83 are respectively wound on the permanent magnet 81, and the first coil 82 and the second coil 83 can be, but are not limited to being, respectively wound on the circular rings;
one end of the power supply unit 86 is connected to the second end of the first coil 82, and the other end of the power supply unit 86 is connected to the second end of the second coil 83;
an input end of the processing unit 85 is connected to a first end of the first coil 82 and a first end of the second coil 83, respectively;
the wireless module 84 is connected to the processing unit 85.
Further, the illustrated power supply unit 86 includes a power supply and an internal resistance, which are connected in series with each other.
It should be noted that the magnetic displacement sensing module 8 adopts the magnetic induction principle to realize a non-contact, inductive and miniaturized displacement characteristic measurement sensing module to measure the displacement characteristic of a tiny space.
In this embodiment, the permanent magnet 81 realizes a closed magnetic circuit loop through the air gap at the opening. When the size of the air gap is changed, the overall magnetic resistance of the magnetic circuit is changed, the magnetic induction intensity B is changed, induced electromotive forces are generated in the first coil 82 and the second coil 83, the electromotive forces are in the level of tens of mV, the processing unit 85 collects and processes the induced electromotive forces, a coding signal is output, and the wireless module 84 transmits the coding signal. The signal processing unit of the measurement and control room 9 comprises a wireless module (not shown in the figure), and the wireless module receives the coded signal, and the signal processing unit decodes the coded signal, restores the coded signal into magnetic induction B, and calculates displacement data according to the magnetic induction B. It should be noted that the magnitude of the magnetic induction B is related to the size of the air gap, and when the air gap is too large, the magnetic induction B is small, and when the air gap is too small, the magnetic induction B is large. The size of the air gap is related to the depth of engagement between the moving contact 21 and the static contact 7, when the depth of engagement between the moving contact 21 and the static contact 7 is larger, the air gap is smaller, and when the depth of engagement between the moving contact 21 and the static contact 7 is smaller, the air gap is larger. When the depth of engagement between the moving contact 21 and the stationary contact 7 reaches a limit value, the air gap reaches a minimum value, and at this time, the magnetic induction B also reaches a maximum value, i.e., a limit value.
Further, the relation between the displacement data and the magnetic induction intensity is s- α B-β+γ0；
Wherein s is the displacement data, B is the magnetic induction, α is a first fitting coefficient, β is a second fitting coefficient, and γ 0 is an initial displacement parameter, which is determined by the installation position of the magnetic displacement sensing module 8.
Further, the first fitting coefficient α is 500-; the second fitting coefficient beta is 0.01-0.025.
In this embodiment, the first fitting coefficient α and the second fitting coefficient β are determined by the characteristics of the magnetic displacement sensing module 8, and the fitting coefficients obtained mainly through numerical processing software are simplified models that are convenient for engineering implementation.
In this embodiment, the magnetic displacement sensing module 8 is of a non-contact and inductive type, and is not required to be in contact with the measured object during installation, and is only required to be fixed below the measured object, so that the original structure is not affected, and the reliability and safety of detection are improved.
As shown in fig. 3, the detection method for automatically detecting the contact engagement state provided by the present invention is applied to the switch cabinet for automatically detecting the contact engagement state, and includes:
step S01: detecting the magnetic induction intensity through the magnetic displacement sensing module 8;
in this embodiment, the magnetic displacement sensing module is disposed below the fixed contact 7 and configured to detect a magnetic induction B, where the magnetic induction B is related to an air gap at an opening of a permanent magnet of the magnetic displacement sensor 8, and a size of the air gap is related to a depth of engagement between the movable contact 21 and the fixed contact 7, and when the depth of engagement between the movable contact 21 and the fixed contact 7 is larger, the air gap is smaller, the magnetic induction B is larger, and when the depth of engagement between the movable contact 21 and the fixed contact 7 is smaller, the air gap is larger, and the magnetic induction B is smaller.
Step S02: obtaining the magnetic induction intensity, calculating displacement data according to the magnetic induction intensity, and judging whether the displacement data is smaller than a preset value S0Outputting the meshing state information of the moving contact and the static contact;
in this implementation, the signal processing unit and the magnetic displacement sensing module 8 transmit the magnetic induction intensity B through wireless signals, which is beneficial to improving the safety and reliability of the switch cabinet.
Step S03: and displaying the displacement data and the engagement state information of the moving contact and the static contact.
In the above technical solution, the magnetic induction B detected by the magnetic displacement sensing module 8 changes as the moving contact 21 gradually approaches the stationary contact 7, and when the moving contact 21 and the stationary contact 7 are completely engaged, the magnetic induction B detected by the magnetic displacement sensing module 8 reaches the limit value. The magnetic displacement sensing module 8 can detect the engagement state of the moving contact 21 and the static contact 7 in real time, and can display the engagement state information of the moving contact and the static contact through the display unit of the measurement and control chamber 9, thereby greatly facilitating the installation and the maintenance of field personnel.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A switch cabinet capable of automatically detecting the engagement state of a contact, comprising: the device comprises a cabinet body (1), a circuit breaker handcart (2), a cable chamber (5), a measurement and control chamber (9) and a magnetic displacement sensing module (8);
the measurement and control chamber (9) comprises a signal processing unit and a display unit, and the measurement and control chamber (9) is arranged on the upper part of the front surface of the cabinet body (1);
the circuit breaker handcart (2) comprises a contact arm, and the circuit breaker handcart (2) is arranged in the middle of the front face of the cabinet body (1);
one end of the contact arm is provided with a moving contact (21);
the cable chamber (5) comprises a wiring end, and the cable chamber (5) is arranged at the upper part of the back surface of the cabinet body (1);
the wiring terminal is provided with a static contact (7) which is arranged opposite to the moving contact (21);
the magnetic displacement sensing module (8) is arranged below the static contact (7) and used for detecting the magnetic induction intensity;
the signal processing unit is used for receiving the magnetic induction intensity, calculating displacement data according to the magnetic induction intensity, and judging whether the displacement data is smaller than a preset value or not so as to output the meshing state information of the moving contact and the static contact;
the display unit is connected with the signal processing unit and used for displaying the displacement data and the meshing state information of the moving contact and the static contact.
2. The switch cabinet for automatically detecting the contact engagement state according to claim 1, wherein the magnetic displacement sensing module (8) comprises a permanent magnet (81) having an opening, a first coil (82), a second coil (83), a power supply unit (86), a wireless module (84) and a processing unit (85);
the first coil (82) and the second coil (83) are respectively wound on the permanent magnet (81);
one end of the power supply unit (86) is connected with the second end of the first coil (82), and the other end of the power supply unit (86) is connected with the second end of the second coil (83);
an input end of the processing unit (85) is connected with a first end of the first coil (82) and a first end of the second coil (83) respectively;
the wireless module (84) is connected with the processing unit (85).
3. The switch cabinet for automatically detecting the contact engagement state according to claim 1, wherein the relationship between the displacement data and the magnetic induction intensity is s- α B-β+γ0；
Wherein s is the displacement data, B is magnetic induction, alpha is a first fitting coefficient, beta is a second fitting coefficient, and gamma 0 is an initial displacement parameter.
4. The switch cabinet for automatically detecting the engagement state of contacts as claimed in claim 3, wherein the first fitting coefficient α is 500-; the second fitting coefficient beta is 0.01-0.025.
5. The switchgear for automatically detecting the state of contact engagement according to claim 1, characterized in that said circuit breaker trolley (2) comprises a guide (22);
the guide rail (22) is arranged below the circuit breaker handcart (2).
6. The switch cabinet capable of automatically detecting the engagement state of the contacts according to claim 1, wherein when the displacement data is less than the preset value, the engagement state information of the moving contact and the fixed contact is engagement success information; the display unit is used for displaying the displacement data and the meshing success information.
7. The switch cabinet for automatically detecting the contact engagement state according to claim 6, characterized in that the measurement and control chamber (9) further comprises a voice module;
the voice module is connected with the signal processing unit and used for sending out prompt tone according to the meshing success information.
8. The switch cabinet for automatically detecting the contact engagement state according to claim 1, further comprising a voltage transformer handcart (3);
the voltage transformer handcart (3) is arranged on the lower portion of the front face of the cabinet body (1).
9. The switch cabinet for automatically detecting the contact engagement state according to claim 1, further comprising a wall bushing (6);
the wall bushing (6) is arranged at the middle upper part of the back surface of the cabinet body (1);
the wall bushing (6) is used for penetrating a bus bar so that the bus bar is connected with the terminal.
10. A method for automatically detecting the engagement state of a contact, which is applied to the switch cabinet for automatically detecting the engagement state of the contact according to any one of claims 1 to 9, and comprises the following steps:
detecting the magnetic induction intensity by the magnetic displacement sensing module (8);
acquiring the magnetic induction intensity, calculating displacement data according to the magnetic induction intensity, and judging whether the displacement data is smaller than a preset value or not so as to output the meshing state information of the moving contact and the static contact;
and displaying the displacement data and the engagement state information of the moving contact and the static contact.
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