CN112700981B - Backup brake separating device of switch cabinet and control method thereof - Google Patents
Backup brake separating device of switch cabinet and control method thereof Download PDFInfo
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- CN112700981B CN112700981B CN202011317908.7A CN202011317908A CN112700981B CN 112700981 B CN112700981 B CN 112700981B CN 202011317908 A CN202011317908 A CN 202011317908A CN 112700981 B CN112700981 B CN 112700981B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
- H01H3/12—Push-buttons
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- 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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The application relates to a backup brake-separating device of a switch cabinet and a control method thereof. The reserve separating brake device of cubical switchboard includes: the pressing module is connected with the current collection module; the current acquisition module is used for acquiring the current of a main brake coil of a circuit breaker of the switch cabinet; the control module is used for acquiring the current of the main brake coil and driving the pressing module to work when the current of the main brake coil represents that the circuit breaker has a separation rejection fault; the pressing module is arranged on the surface of the switch cabinet and used for pressing the opening button under the driving of the control module. According to the backup brake separating device of the switch cabinet, under the condition that the breaker has a separation failure, the control module drives the pressing module to press the brake separating button and push the mechanical tripping device of the operating mechanism, so that the breaker can be successfully separated.
Description
Technical Field
The application relates to the technical field of circuit breakers, in particular to a backup opening device of a switch cabinet and a control method of the backup opening device.
Background
With the rapid development of national economy, the power supply demand is further expanded, the requirement on the power supply reliability of a transformer substation is higher and higher, and the requirement on the operation reliability of switch equipment in the transformer substation is correspondingly improved. A switchgear is a switchgear of a substation. The main function of the switch cabinet is to open and close, control and protect electric equipment in the process of power generation, power transmission, power distribution and electric energy conversion of an electric power system. The components in the switch cabinet mainly comprise a circuit breaker, a disconnecting switch and the like.
Due to the influence of various factors during the operation of the circuit breaker, faults such as refusal of separation are easy to occur. Once the breaker is rejected, a large-area power failure accident can be caused, even the personal safety is threatened, and serious influence is brought.
Disclosure of Invention
Therefore, it is necessary to provide a backup opening device of a switch cabinet and a control method thereof, which can successfully open the circuit breaker for the opening failure of the circuit breaker.
In a first aspect, a backup opening device of a switch cabinet is provided, and the backup opening device is located on a surface of the switch cabinet, and the backup opening device of the switch cabinet comprises: the device comprises a current sampling module, a pressing module and a control module, wherein the control module is respectively connected with the current sampling module and the pressing module;
the current acquisition module is used for acquiring the current of a main brake coil of a circuit breaker of the switch cabinet;
the control module is used for acquiring the current of the main brake coil and driving the pressing module to work when the current of the main brake coil represents that the breaker has a separation failure;
the pressing module is arranged on the surface of the switch cabinet and used for pressing the opening button under the driving of the control module.
In one embodiment, the current collection module comprises an open-close type direct current transformer which is arranged on a main brake coil of the circuit breaker.
In one embodiment, the backup opening device of the switch cabinet further comprises a mounting bracket fixed on the surface of the switch cabinet; should press the module and include:
the electromagnet is fixedly connected with the mounting bracket and presses the opening button when the electromagnet is electrified;
and the starting contactor is respectively connected with the control module and the electromagnet and is used for electrifying the electromagnet under the driving of the control module.
In one embodiment, the starting contactor comprises a relay for closing when receiving a high level signal of the control module, so as to electrify the electromagnet.
In one embodiment, the backup opening device of the switch cabinet further comprises: and the voltage detection module is used for detecting the state of the switch auxiliary contact, and the switch auxiliary electric shock is used for indicating the opening and closing of the circuit breaker.
In one embodiment, the mounting bracket is fixed to a housing of a CT19 type spring actuator of the circuit breaker, and the electromagnet is configured to press a trip button of the CT19 type spring actuator when energized.
In one embodiment, the control module is configured to drive the pressing module to operate if the voltage detection module does not detect the switch auxiliary electrical shock being disconnected all the time within a first preset time period after the current of the main brake coil reaches a preset current value.
In one embodiment, the control module is further configured to reset the backup brake separating device after the pressing module is driven to operate for a second predetermined duration; and resetting the backup brake-separating device after the voltage detection module detects that the switch auxiliary contact is disconnected for a second preset time.
In a second aspect, a control method for a backup opening device of a switch cabinet, the backup opening device being located on a surface of the switch cabinet, the control method comprising:
the current sampling module is used for collecting the current of a main brake coil of a breaker of the switch cabinet;
when the main brake coil current of the breaker of the switch cabinet represents that the breaker has a separation failure, the pressing module is driven to press the brake separating button and is arranged on the surface of the switch cabinet.
In one embodiment, the control method of the backup opening device of the switch cabinet further comprises the following steps:
and within a first preset time after the current of the main brake coil reaches a preset current value, if the voltage detection module does not detect that the switch auxiliary contact is disconnected all the time, the pressing module is driven to work.
According to the backup brake-separating device of the switch cabinet and the control method thereof, under the condition that the circuit breaker has a separation failure, the control module drives the pressing module to press the brake-separating button to push the mechanical tripping device of the operating mechanism, so that the circuit breaker can be successfully separated.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a backup opening device of a switch cabinet in one embodiment;
FIG. 2 is a schematic structural diagram of a current collection module and a main opening coil in one embodiment;
FIG. 3 is a schematic diagram of the press module and mounting bracket in one embodiment;
FIG. 4 is a circuit diagram of an embodiment of AC power and DC24V conversion;
FIG. 5 is a circuit diagram of one embodiment of DC24V to DC5V conversion;
FIG. 6 is a circuit diagram of a core processor in one embodiment;
FIG. 7 is a circuit diagram of a sensor interface in one embodiment;
FIG. 8a is a circuit diagram of the trip feedback point in one embodiment;
FIG. 8b is a circuit diagram of a backup split output drive in one embodiment;
FIG. 8c is a circuit diagram of an output port in one embodiment;
fig. 9 is a schematic flow chart illustrating a method for controlling a backup opening device of a switchgear in one embodiment;
fig. 10 is a schematic flow chart of a control method of a backup opening device of a switch cabinet in another embodiment.
Description of reference numerals: 102-a current acquisition module, 104-a pressing module, 106-a control module, 202-an open-close type direct current transformer, 204-a main opening coil, 302-an electromagnet, 304-a mounting bracket, 304 a-an upper side, 304 b-a front side, 304 c-a lower side, 306-an opening button and 308-a switch cabinet.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.
Spatially relative terms, such as "under," "below," "beneath," "under," "above," "over," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. In addition, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", and the like if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
With the rapid development of national economy, the power supply demand is further expanded, the requirement on the power supply reliability of a transformer substation is higher and higher, and the requirement on the operation reliability of switch equipment in the transformer substation is correspondingly improved. The 10KV switch equipment in the transformer substation is directly connected with a feeder line power supply circuit facing a user, the consumption is large, the coverage area is wide, and the probability of operation failure is correspondingly high. In recent years, when a line has a fault, the performance of a 10KV switching device opening and closing coil is degraded after long-term operation, and the 10KV switching device does not operate reliably, so that a line switch refuses to operate when the line switch needs to operate, the override trip of the switch is caused, the power failure range is expanded, and the outstanding contradiction exists with the requirement on high reliability of substation equipment.
The 10KV switch cabinet used in the early stage is mostly a box type fixed alternating current metal closed switch cabinet (XGN cabinet), a ZN28 type suspended vacuum circuit breaker is matched with the switch cabinet, an operating mechanism of the circuit breaker is a CT19-I type spring operating mechanism, and the operating mechanism is separated from a circuit breaker body and is independently installed outside the switch cabinet. The failure rate of the current switch equipment of the type is higher due to the technical design and process limitation of the equipment during manufacturing and the aging of the equipment caused by longer running time.
The most common equipment faults of the early-stage operation XGN cabinet are the failure of the opening of the circuit breaker due to the deterioration of the performance of an opening coil, the mechanical clamping stagnation of an operating mechanism and the like. Once the fault occurs, the breaking coil burns out equipment and is damaged, and the lower backup protection action trips due to the breaking failure, so that a override trip event is caused, the power failure range of an accident is expanded, and great economic loss and social influence are caused.
In order to solve the one-time brake opening failure fault of the vacuum circuit breaker of the externally-hung CT19 spring-operated mechanism, a method of modifying equipment or periodically overhauling is generally adopted, but because the standardization degree of the 10KV switch equipment which is put into operation in the early stage is lower, the 10KV switch equipment is not universal with the switch equipment which is mainstream in the current industry, and a plurality of products belong to industry elimination production-stop products, the aim of modifying and upgrading can be achieved by partially replacing accessories, only the technical scheme of completely modifying and replacing the equipment can be adopted, but the cost is higher, and the operation period of the equipment does not reach the period which is allowed to be replaced by asset management, so the equipment cannot be completely replaced under the actual condition. And the method of regular maintenance is adopted, and the equipment needs to be maintained under the condition of power failure, so that the regular maintenance is limited by the power failure time, and the problem of the circuit breaker is difficult to completely solve.
In view of the above, it is necessary to provide a backup opening device of a switch cabinet and a control method thereof, which can successfully open the circuit breaker in response to the opening rejection fault of the circuit breaker of the switch cabinet.
In an alternative embodiment of the present application, as shown in fig. 1, a backup opening device of a switch cabinet is provided, and the backup opening device is located on the surface of the switch cabinet. Specifically, the backup opening device includes a current collecting module 102, a pressing module 104, and a control module 106. Specifically, the control module 106 is connected to the current collecting module 102 and the pressing module 104 respectively. Specifically, the current collecting module 102 is configured to collect a current of a main separating coil of a circuit breaker of the switch cabinet. The control module 106 is used for acquiring the current of the main brake coil and driving the pressing module 104 to work when the current of the main brake coil indicates that the circuit breaker has a fault. The pressing module 104 is disposed on a surface of the switch cabinet, and is configured to press the opening button under the driving of the control module 106.
It should be explained that in case of closing of the circuit breaker, the main breaking coil current is not present. When a switching-off command is received, a direct current voltage, such as 110V or 220V direct current voltage, is applied across the main switching-off coil, and the main switching-off coil generates a current. The opening command can be generated by starting a protection circuit due to a line fault or artificially generated by a centralized control or local control mode under a normal condition. Specifically, local control means that a manual operating mechanism of the circuit breaker is operated by hands or a button is used for controlling to complete switching-on and switching-off tasks near the circuit breaker. The centralized control is control performed in a main control room, and in such a control method, a distance of several tens of meters to several hundreds of meters is generally provided between a controlled circuit breaker and the main control room.
It should be explained that the high-voltage short-circuit devices all have switch auxiliary contacts, and the purpose of opening and closing the circuit is achieved through opening and closing of the switch auxiliary contacts, so that the circuit can be completed only by depending on a certain mechanical operation system, and a mechanical operation device outside the circuit breaker body is called as an operation mechanism. The breaker can be opened by pressing an opening button of the operating mechanism.
Specifically, the current collection module 102 collects currents of main brake coils of circuit breakers of the switch cabinet in real time, and when the collected currents of the main brake coils represent that the circuit breakers break down, the control module 106 drives the pressing module 104 to press brake separating buttons on the surface of the switch cabinet, so that the operating mechanism acts, and brake separating of the circuit breakers is achieved.
In the backup brake-separating device of the switch cabinet, under the condition that the breaker has a separation failure, the control module 106 drives the pressing module 104 to press the brake-separating button, and pushes the mechanical tripping device of the operating mechanism, so that the breaker can be successfully separated.
Furthermore, as the backup brake-separating device is positioned on the surface of the switch cabinet, the mechanical design independent of the original operating mechanism is adopted, and the normal action of the original operating mechanism cannot be influenced.
Furthermore, in the backup brake separating device according to the embodiment of the present application, the control module 106 automatically controls the pressing module 104 to press the brake separating button according to the main brake separating coil current collected by the current collecting module 102, without manual judgment and operation, so that the accuracy of the brake separating operation is improved, and the manual labor is reduced.
Furthermore, the switch cabinet is upgraded and modified in the mode of adopting the impressed current collection module 102, the pressing module 104 and the control module 106, the modification power off time is reduced, even the modification without power outage is realized, and the limitation of the power off time on the modification is greatly reduced.
Furthermore, the backup brake separating device provided by the embodiment of the application only needs to invest extremely low material cost and is simple and convenient to modify, the success rate of primary brake separating of equipment is greatly improved, the problem that a system is frequently subjected to a override trip event caused by equipment faults is solved, high economic benefits are achieved, the electricity utilization experience of users is improved, and the social influence caused by power failure is reduced.
It can be known from the analysis of the above embodiments that the control module needs to drive the pressing module according to the main brake coil current collected by the current collection module, and then, the following embodiments relate to how the current collection module collects the main brake coil current.
Optionally, the current collecting module may include a dc transformer. Specifically, a direct current transformer is sleeved on a main brake coil of the circuit breaker. In one embodiment, an open-close type dc transformer 202 is used, such as the open-close type dc transformer 202 shown in fig. 2, and the open-close type dc transformer 202 is installed to be connected to a main opening coil 204 of a secondary chamber terminal of a switch cabinet. Adopt open-close type direct current transformer 202 to carry out current acquisition, can realize upgrading when transforming to the cubical switchboard, do not change the original wiring of cubical switchboard, do not influence the original work of cubical switchboard to can realize not having the outage and install additional. In one embodiment, the rated voltage of the open-close type DC transformer 202 is DC5V, and the operating range is: 0-10A, 2.5 +/-0.625V of output voltage, 5 mus of response time and 1 percent of measurement precision.
The above embodiments provide a structure of a current collection module, and the following embodiments will provide a structure of a pressing module.
Referring to fig. 3, in an alternative embodiment of the present application, the pressing module includes an electromagnet 302 and an actuating contactor. Specifically, the surface of the switch cabinet 308 is provided with a mounting bracket 304, the electromagnet 302 is fixedly connected with the mounting bracket 304, the starting contactor is respectively connected with the control module and the electromagnet 302, the starting contactor is used for enabling the electromagnet 302 to be electrified under the driving of the control module, and the electromagnet 302 presses the opening button 306 when being electrified, so that the opening of the circuit breaker is realized.
Optionally, the mounting bracket 304 is a magnetic mounting bracket, and the mounting bracket 304 is fixed on the surface of the switch cabinet 308 by magnetic force. The mounting bracket 304 is fixed on the surface of the switch cabinet 308 through magnetic force, so that the mounting bracket 304 can be prevented from damaging the integrity of the surface of the switch cabinet 308. Optionally, as shown in fig. 3, the mounting bracket 304 includes an upper side 304a, a front side 304b and a lower side 304c, optionally, the upper side 304a completely covers the top of the switch cabinet 308, preferably, as shown in fig. 3, the length of the upper side 304aX is smaller than the length of the switch cabinet 308X, the length of the upper side 304aY is greater than the length of the switch cabinet 308Y, and the length of the upper side 304a in the Y direction covering the switch cabinet 308 portion is equal to the length of the switch cabinet 308Y. By reducing the length in the X direction, the cost of manufacturing the mounting bracket 304 can be saved and the weight of the mounting bracket 304 can be reduced, facilitating the installation by the worker. The length of the switch cabinet 308 covered in the Y direction is the same as the length of the switch cabinet in the Y direction, so that the stable connection between the mounting bracket 304 and the switch cabinet 308 can be ensured. Optionally, the lower side 304c is fixedly connected to the lower position of the opening button 306, and in one embodiment, as shown in fig. 3, the connection position of the lower side 304c and the switch cabinet 308 forms a rectangle. The rectangular connecting part can increase the connecting area between the lower side 304c and the switch cabinet, increase the connecting force, prevent the surface mounting bracket 304 from sliding off, and reduce the volume of the non-connecting part, thereby reducing the material required for preparing the mounting bracket 304 and saving the preparation cost of the mounting bracket 304.
The electromagnet 302 is fixedly mounted to the front side 304b of the mounting bracket and, in one embodiment, is mounted to a central portion of the front side 304 b. In one embodiment, the connection point of the electromagnet 302 and the front side 304b of the mounting bracket is consistent with the height of the opening button 306 from the ground, that is, the electromagnet 302 generates an impulse force perpendicular to the opening button 306 to act on the opening button 306, so as to avoid the loss of the impulse force caused by the non-perpendicular angle, and ensure that sufficient impulse force is provided for the opening button 306, thereby realizing the successful opening of the circuit breaker.
It is understood that the mounting bracket 304 may also take other forms, not limited to the form mentioned in the above embodiments, as long as it is configured to allow the electromagnet 302 to press the trip button 306 to trip the short circuit device when energized.
It should be explained that the electromagnet 302 includes a coil, a core and an armature, and when the coil is energized, the core and the armature are magnetized to become two magnets of opposite polarity, which create an electromagnetic attraction therebetween. When the attraction force is greater than the reaction force of the spring, the armature starts to move toward the iron core. When the current in the coil is smaller than a certain value or the power is supplied from the terminal, the electromagnetic attraction is smaller than the counterforce of the spring, and the armature returns to the original release position under the action of the counterforce. In one embodiment, the electromagnet 302 is a long stroke push-pull electromagnet, so that when the electromagnet 302 is powered on, a larger pushing force and a longer action stroke can be generated, thereby ensuring that enough pushing force is provided for the opening button 306, and therefore, the opening success of the circuit breaker is realized. Preferably, the continuous pushing force of the long-stroke push-pull electromagnet is 20N.
In an alternative embodiment of the application, the switch cabinet is an early-designed XGN cabinet, a spring operating mechanism of a circuit breaker of the XGN cabinet is externally installed at the front of a housing of the switch cabinet, a protective cover is externally installed outside the operating mechanism, and a manually-operated opening and closing operating button is arranged on the front of the housing. Optionally, the mounting bracket is fixed to an outer cover of a CT19 type spring operating mechanism of the circuit breaker, and the electromagnet is configured to press a switch-off button of the CT19 type spring operating mechanism when the circuit breaker is powered on.
In the above embodiment, the pressing module includes an electromagnet and a starting contactor, and it is known from the above analysis that the coil of the electromagnet presses the opening button when the coil is energized, then the following embodiment will provide a structure capable of controlling the energization and the deenergization of the electromagnet under the driving of the control module.
In an optional embodiment of the present application, the starting contactor includes a relay, and optionally, the relay may be an overvoltage relay or an undervoltage relay. In an alternative embodiment of the present application, the relay is an overvoltage relay, which includes a core, a coil, an armature, a contact spring, and the like. A certain voltage is applied to two ends of the coil, a certain current flows in the coil, so that an electromagnetic effect is generated, the armature iron overcomes the pulling force of the return spring under the action of electromagnetic force attraction and is attracted to the iron core, and the movable contact of the armature iron is driven to be attracted with the fixed contact (normally open contact); when the coil is powered off, the electromagnetic attraction force disappears, and the armature returns to the original position under the counterforce of the spring, so that the movable contact is attracted with the original static contact (normally closed contact).
In an alternative embodiment of the present application, the starting contactor comprises a relay which closes to energize the electromagnet upon receiving a high signal from the control module.
Specifically, the control module acquires the main brake coil current acquired by the current acquisition module, when the main brake coil current represents that the breaker has a separation failure, a high-level signal is output to the relay, the relay is closed, the electromagnet coil circuit is conducted, the current is acquired, the electromagnet acts, and the brake separating button is pressed, so that the breaker is separated. The overvoltage relay has the advantages of quick action, stable work and small volume, and is beneficial to ensuring stable closing under the driving of the control module, thereby realizing the electrification of the electromagnet.
The embodiment describes that the high-voltage circuit breakers are provided with the switch auxiliary contacts, and the purpose of opening and closing the circuit is achieved by opening and closing the switch auxiliary contacts, namely the switch auxiliary contacts can indicate the opening and closing of the circuit breakers. Therefore, the on/off state of the circuit breaker can be known by detecting the voltage state of the switch auxiliary contact.
In an optional embodiment of the present application, the backup opening device of the switch cabinet further includes a voltage detection module, configured to detect a state of the switch auxiliary contact.
It should be explained that the switch auxiliary contact can be a switch closing auxiliary contact or a switch opening auxiliary contact; the contact can be a normally open contact or a normally closed contact. When the switch auxiliary contact is a normally open switch opening auxiliary contact, the circuit breaker is not opened, the switch auxiliary contact has no voltage, and when the circuit breaker is successfully opened, the switch auxiliary contact has voltage.
In the above embodiments, the pressing module is driven to operate when the main brake coil current indicates that the circuit breaker has a separation rejection fault, and then the following embodiments relate to the situation under which the driving module drives the pressing module to operate.
In an optional embodiment of the present application, the control module drives the pressing module to operate if the voltage detection module does not detect that the switch auxiliary contact is turned off all the time within a first preset time period after the current of the main brake coil reaches the preset current value.
Specifically, the switch auxiliary contact is a normally closed switch closing auxiliary contact, and is closed when the circuit breaker is in a closing state, and is opened when the circuit breaker is in an opening state. When the current acquisition module acquires that the current of the main brake coil reaches a preset current value, the current acquisition module represents that a brake-separating command is received at the moment, and the breaker needs to realize brake-separating action. The first preset time period is the time necessary for the circuit breaker to realize opening, and in one embodiment, the first preset time period comprises the time necessary for the circuit breaker to realize opening and the time required for signal transmission. First time of predetermineeing including the circuit breaker realize the necessary time of separating brake and the required time of signal transmission for the control module group can not appear under the condition of former operating device action, and the module work is pressed in the drive, the condition of misjudgement can not appear promptly, improves the accuracy that the module work was pressed in the control module group drive. In one embodiment, the first predetermined period is 1.1-1.3 seconds, and in one embodiment, the first predetermined period is 1.2 seconds. The first preset time is 1.2s, so that the condition that the switch closing auxiliary contact is not disconnected due to the fact that the breaker has a disconnection refusing fault can be ensured, and the condition that the time is not too long, and a override trip event occurs can be avoided.
It should be noted that the preset current value is smaller than the current steady-state value of the main brake coil when the main brake coil is operated, and generally, when the voltage applied across the main brake coil is 110V, the steady-state current of the main brake coil is about 2A. Optionally, the preset current value is greater than or equal to 0.35A, and in one embodiment, the preset current value is 0.35A. The preset current value of 0.35A ensures that the current is generated due to the opening command and does not interfere with the introduced current, and the timing is avoided after the current reaches the steady state. The first preset duration is timed, so that the time for driving the pressing module to work by the control module can be shortened, and the override tripping event is reduced.
In an alternative embodiment of the present application, the main switching coil current reaching the preset current value means that the current lasts for a time higher than the preset current value for a third preset time period. Optionally, the third preset time period is 13ms to 15ms, and preferably, the third preset time period is 14ms.
This embodiment has increased the prerequisite of a control module group drive press module work for last embodiment, and this prerequisite is that main brake coil current lasts to be higher than predetermineeing the electric current in the third predetermined duration for this prerequisite, through setting up this prerequisite, can further ensure that main brake coil has produced the electric current that is higher than the predetermined current value, is because the separating brake command causes, and not because other interference lead to main brake coil to have produced the electric current, has improved the drive and has pressed the degree of accuracy of module work.
It can be known from the foregoing description of the embodiment that the control module needs to perform timing to ensure the accuracy of driving the pressing module to work, and in order to ensure that the control module can drive the pressing module to work again when the next circuit breaker has a disconnection failure, and press the disconnection button to realize the disconnection of the circuit breaker, the following embodiment will provide a backup disconnection device of a switch cabinet with a resetting function.
In an optional embodiment of the present application, the control module is further configured to reset the backup separating brake device after the driving pressing module operates for a second preset duration; and resetting the backup brake separating device after the voltage detection module detects that the switch auxiliary contact is disconnected for a second preset time.
It should be explained that resetting the backup tripping device includes clearing the timing data of the above embodiment, where the timing data includes timing of a first preset time, timing of a third preset time, timing after the control module drives the pressing module to operate, and timing after the voltage detection module detects that the switch auxiliary contact is disconnected, so that the control module can reuse the timing unit, so as to re-time when the next breaker fails, and accurately drive the pressing module to operate.
By delaying the second preset time, the backup brake separating device is reset instead of resetting immediately after the driving pressing module works or after the voltage detection module detects that the switch auxiliary contact is disconnected, the stability of the control module can be improved. Optionally, the second preset time period is 0.4-0.6s, and in one embodiment, the second preset time period is 0.5s.
According to the embodiment, the control module needs to drive the pressing module to work when the main brake coil current indicates that the circuit breaker has the separation rejection fault, and the following embodiment provides a control module capable of achieving the function.
Optionally, the control module is designed based on a microcontroller of a single chip microcomputer, and comprises a power circuit, a sensor interface circuit, a core controller, an output driver and an I/O interface terminal.
The control module comprises a control module, a power supply circuit and a control module, wherein the control module is used for supplying power to the control module, the power supply circuit is connected with an external AC220V alternating current power supply, and the power supply circuit is connected with the external AC220V alternating current power supply to generate internal working voltages of direct current 5V (DC 5V) and direct current 24V (DC 24V), wherein fig. 4 shows a circuit diagram of conversion between the alternating current power supply and the direct current 24V, and fig. 5 shows a circuit diagram of conversion between the direct current 24V and the direct current 5V.
FIG. 6 is a circuit diagram of a core processor, specifically an 8-bit processor with 16I/O units, a speed of 16MHz, a program RAM capacity of 8K, and a data RAM capacity of 1K.
Fig. 7 is a circuit diagram of a sensor interface, the sensor interface circuit is connected with the current collection module and the core processor, and optionally, the sensor interface circuit is connected with the dc transformer and the core processor, so as to provide a high-quality voltage power supply and a good grounding, enhance the anti-interference capability of the dc transformer, solve the characteristic that the dc transformer is easily interfered, and transmit the collected main brake coil current to the core processor.
Fig. 8a, 8b and 8c are circuit diagrams of the external interface, including a circuit diagram of the opening feedback point shown in fig. 8a, a circuit diagram of the backup opening output drive shown in fig. 8b and a circuit diagram of the output port shown in fig. 8 c. Specifically, the circuit I/O interface terminal and the output drive circuit breaker displacement signals for external feedback of the connecting circuit, namely the state of the switch auxiliary contact and the drive of the pressing module. Specifically, the output interface terminals 2 and 5 are connected in series with a direct current transformer for collecting the current of the opening coil.
In an embodiment of the present application, as shown in fig. 9, there is provided a method for controlling a backup opening device of a switch cabinet, wherein the backup opening device is located on a surface of the switch cabinet, the method including:
s902: the current sampling module collects the current of a main brake coil of a breaker of the switch cabinet.
S904: when the main brake coil current of the circuit breaker of the switch cabinet represents that the circuit breaker has a separation failure, the driving pressing module presses the brake separating button, and the pressing module is arranged on the surface of the switch cabinet.
Under the condition that the breaker has a fault of refusing to be separated, the driving pressing module presses the brake separating button to push the mechanical tripping device of the operating mechanism, so that the breaker can be successfully separated, a override tripping event is avoided, higher economic benefit is achieved, the electricity utilization experience of a user is improved, and the social influence caused by power failure is reduced.
In an optional embodiment of the present application, the method for controlling a backup opening device of a switch cabinet further includes: and in a first preset duration after the current of the main brake coil reaches a preset current value, if the voltage detection module does not detect that the switch auxiliary contact is disconnected all the time, the pressing module is driven to work.
Specifically, the switch auxiliary contact is a normally closed switch closing auxiliary contact, and is closed when the circuit breaker is in a closing state, and is opened when the circuit breaker is in an opening state. The definition of the first preset duration is the same as that of the previous embodiment, and is not described herein again.
In an optional embodiment of the present application, the method for controlling a backup opening device of a switch cabinet further includes: and in a third preset time period after the current of the main brake coil reaches a preset current value, if the current of the main brake coil is continuously higher than the preset current value in a first preset time period, the voltage detection module does not detect that the switch auxiliary contact is disconnected all the time, and then the pressing module is driven to work.
The definition of the third preset duration is the same as that of the foregoing embodiment, and is not described herein again.
In an optional embodiment of the present application, the method for controlling a backup opening device of a switch cabinet further includes: resetting the backup brake separating device after the driving pressing module works for a second preset time; and resetting the backup brake separating device after the voltage detection module detects that the switch auxiliary contact is disconnected for a second preset time.
The second preset duration and the definition of the resetting backup brake-separating device are the same as those of the previous embodiment, and are not described herein again.
In an alternative embodiment of the present application, a method for controlling a backup opening device of a switch cabinet is provided, the method including: the backup brake separating device samples a current signal of a main brake separating coil of an original switch CT19 type spring operation mechanism, after a set time delay, the set time delay is optional and is 1.2s, whether the circuit breaker is shifted from on to off is detected, and if the circuit breaker is shifted, the backup brake separating device is reset; if the circuit breaker can not be detected to be displaced after the set time delay, the starting contactor is driven to electrify the electromagnet coil, and the electromagnet directly presses the opening button of the CT19 spring operation mechanism to force the opening action. And after the backup brake separating device executes the brake separating action, resetting after 0.5s.
In an alternative embodiment of the present application, as shown in fig. 10, there is provided a method for controlling a backup opening device of a switch cabinet, the method including:
and S902, the current sampling module collects the current of a main brake coil of a breaker of the switch cabinet.
And S1002, in a third preset time period after the current of the main brake coil reaches a preset current value, if the current of the main brake coil is continuously higher than the preset current value in a first preset time period, the voltage detection module drives the pressing module to work if the voltage detection module does not detect that the switch auxiliary contact is disconnected all the time.
S1004: resetting the backup brake separating device after the driving pressing module works for a second preset time; and resetting the backup brake-separating device after the voltage detection module detects that the switch auxiliary contact is disconnected for a second preset time.
It should be understood that, although the various steps in the flowcharts of fig. 9-10 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 9-10 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the steps or stages is not necessarily sequential, but may be performed alternately or alternatively with other steps or at least some of the steps or stages in other steps.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic depictions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.
Claims (11)
1. A backup opening device of a switch cabinet, characterized in that the backup opening device is arranged on the surface of the switch cabinet, and the backup opening device of the switch cabinet comprises: the device comprises a current acquisition module, a voltage detection module, a pressing module and a control module, wherein the control module is respectively connected with the current acquisition module and the pressing module;
the current acquisition module is used for acquiring the current of a main brake coil of a circuit breaker of the switch cabinet;
the voltage detection module is used for detecting the state of a switch auxiliary contact of a breaker of the switch cabinet;
the control module is used for acquiring the current of the main brake-separating coil, and driving the pressing module to work if the voltage detection module does not detect that the switch auxiliary contact is disconnected all the time within a first preset time after the current of the main brake-separating coil reaches a preset current value;
the control module is also used for resetting the backup brake-separating device after the pressing module is driven to work for a second preset time; after the voltage detection module detects that the switch auxiliary contact is disconnected for a second preset time, resetting the backup brake-separating device;
the pressing module is arranged on the surface of the switch cabinet and used for pressing the opening button under the driving of the control module to push the mechanical tripping device of the operating mechanism of the circuit breaker.
2. A backup opening device for a switch cabinet according to claim 1, characterized in that the current collection module comprises an open-close type direct current transformer arranged on a main opening coil of the circuit breaker.
3. A backup tripping device for a switchgear cabinet according to claim 1, further comprising a mounting bracket fixed to a surface of the switchgear cabinet; the press module includes:
the electromagnet is fixedly connected with the mounting bracket and presses the brake separating button when being electrified;
and the starting contactor is respectively connected with the control module and the electromagnet and used for electrifying the electromagnet under the driving of the control module.
4. A backup tripping device for a switchgear cabinet according to claim 3, characterised in that the starting contactor comprises a relay for closing to energize the electromagnet upon receiving a high signal from the control module.
5. A backup separating brake device of a switch cabinet according to claim 1, characterized in that the switch auxiliary contact is used for indicating the opening and closing of the circuit breaker.
6. A back-up switch-off device for a switchgear cabinet according to claim 3, wherein the mounting bracket is fixed to a housing of a CT19 type spring actuator of the circuit breaker, and the electromagnet is configured to press a switch-off button of the CT19 type spring actuator when the electromagnet is energized.
7. The backup opening device of the switch cabinet according to claim 1, wherein before the control module drives the pressing module to operate, it is determined whether the current of the main opening coil is continuously higher than the preset current value within a third preset time period, and if so, the pressing module is driven to operate.
8. A backup tripping device for a switchgear cabinet according to claim 7, characterised in that the resetting backup tripping device comprises clearing count data, wherein the count data comprises: the timing of the first preset time length, the timing of the third preset time length, the timing after the control module drives the pressing module to work and the timing after the voltage detection module detects that the switch auxiliary contact is disconnected.
9. A control method of a backup opening device of a switch cabinet is characterized in that the backup opening device is positioned on the surface of the switch cabinet, and the backup opening device of the switch cabinet comprises the following steps: the device comprises a current acquisition module, a voltage detection module, a pressing module and a control module, wherein the control module is respectively connected with the current acquisition module and the pressing module; the control method comprises the following steps:
the current sampling module is used for collecting the current of a main brake coil of a breaker of the switch cabinet;
the voltage detection module detects the state of a switch auxiliary contact of a breaker of the switch cabinet;
within a first preset time after the current of a main brake coil of a circuit breaker of the switch cabinet reaches a preset current value, if the voltage detection module does not detect that the switch auxiliary contact is disconnected all the time, the voltage detection module drives the pressing module to work; the pressing module presses a brake separating button under the driving of the control module to push an operating mechanism mechanical tripping device of the circuit breaker;
after the control module drives the pressing module to work for a second preset time, resetting the backup brake separating device; and resetting the backup brake-separating device after the voltage detection module detects that the switch auxiliary contact is disconnected for a second preset time.
10. The method for controlling the backup opening device of the switch cabinet according to claim 9, further comprising:
and judging whether the current of the main brake separating coil is continuously higher than the preset current value within a third preset time before the control module drives the pressing module to work, and if so, driving the pressing module to work.
11. The method for controlling the backup opening device of the switch cabinet according to claim 10, further comprising:
resetting backup separating brake device is including cleaing away count data, and wherein, count data includes: the timing of the first preset time length, the timing of the third preset time length, the timing after the control module drives the pressing module to work and the timing after the voltage detection module detects the switch auxiliary contact is disconnected.
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| CN202011317908.7A CN112700981B (en) | 2020-11-23 | 2020-11-23 | Backup brake separating device of switch cabinet and control method thereof |
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| CN202011317908.7A CN112700981B (en) | 2020-11-23 | 2020-11-23 | Backup brake separating device of switch cabinet and control method thereof |
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| KR101555688B1 (en) * | 2013-07-15 | 2015-09-25 | 윤여관 | Trip Button of Contact Breaker Switching Device |
| CN103715031B (en) * | 2013-12-30 | 2017-07-11 | 广东电网公司中山供电局 | Breaker of switch cabinet brake-dividing system |
| CN204144158U (en) * | 2014-10-09 | 2015-02-04 | 国家电网公司 | Circuit breaker emergency treatment device |
| CN207183195U (en) * | 2017-09-18 | 2018-04-03 | 谭彦毅 | Spring energy-storing mechanism of breaker separating brake jumping aid device |
| CN111106558A (en) * | 2020-01-03 | 2020-05-05 | 国网河北省电力有限公司 | Assistant emergency device for switch fault of indoor switch cabinet |
| CN111584261A (en) * | 2020-04-30 | 2020-08-25 | 国家电网有限公司 | Emergent distant place separating brake device of power switch cabinet |
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| CN205921442U (en) * | 2016-08-08 | 2017-02-01 | 无锡市联合电控设备有限公司 | Spare power automatic switching system for low -voltage complete switch cabinet |
| CN110265238A (en) * | 2019-07-18 | 2019-09-20 | 上海南华兰陵电气有限公司 | The reliable trip gear of 10KV switchgear |
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