CN114243392B - Switch cabinet connector safety monitoring system and control method - Google Patents
Switch cabinet connector safety monitoring system and control method Download PDFInfo
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- CN114243392B CN114243392B CN202111555064.4A CN202111555064A CN114243392B CN 114243392 B CN114243392 B CN 114243392B CN 202111555064 A CN202111555064 A CN 202111555064A CN 114243392 B CN114243392 B CN 114243392B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
- H01R13/6683—Structural association with built-in electrical component with built-in electronic circuit with built-in sensor
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/185—Electrical failure alarms
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Abstract
The invention relates to a system for monitoring the safety of a switch cabinet connector, which belongs to the technical field of electrical system engineering, wherein n loop connectors which are supplied with power in a plugging mode are arranged in a switch cabinet, and the system comprises: n miniature temperature label sensors, n miniature stress label sensors; a reader; the intelligent controller receives temperature signals and contact stress signals of the n connectors transmitted by the reader, stores the temperature signals and the contact stress signals of the n connectors, respectively judges the safety level faults of the temperature signals and the contact stress signals of the n connectors, compares the safety fault levels, and outputs the highest-level safety fault signal of the connector with the fault; the working state of the connector can be accurately monitored in real time, and early warning, alarming and fault processing are carried out. Even under the condition of low current and no power transmission, faults such as poor contact of the connector, no in-place plugging and the like can be judged.
Description
Technical Field
The invention belongs to the technical field of electrical system engineering, and relates to a switch cabinet connector safety monitoring system and a control method.
Background
The electrical switch cabinet is a main device for transmitting and distributing electric energy in a power distribution system, a connector is a key part of the switch cabinet, in the case of switch cabinet failure or accident, the connector failure is the most common type, and the safety and the reliability of the operation of the electrical switch cabinet affect the quality level of electric energy supply. The connector breaks down and is a gradual change process, when the switch cabinet runs for a long time, the inner conductor of the connector can be in poor contact and increased contact resistance due to aging, incomplete plugging, overcurrent and the like, and the temperature is too high, so that the connector is burnt, an electrical fire is caused, and the equipment and personal safety are seriously damaged. Therefore, the switch cabinet connector is safely monitored, the running state of the switch cabinet connector is timely tracked, hidden dangers are found as soon as possible, measures are taken, and the switch cabinet connector has very important significance for eliminating fault hidden dangers and ensuring safe running of an electrical control cabinet.
Because the conductor part of the connector is sealed in a mechanical structure, the actual temperature and the plugging state of the conductor of the internal connection point are difficult to measure, and if the defect of overheat of the connector is not discovered and treated in time, the safe production of electric power is seriously threatened.
The technical scheme commonly used at present is that an external temperature sensor is added at each connector connection point of a switch cabinet, the conductor temperature of the connection point is detected in a non-contact manner, the connection state of a loop is reflected by monitoring the temperature of each connector, the actually monitored temperature of each connection point is compared with the maximum temperature set limit value, an alarm signal is sent to a background monitoring system, and the fault is judged and processed by an operator. The temperature of the conductor is detected in a non-contact manner, and the measured data is inaccurate; in most practical applications, the actual load current of the loop generally only reaches 40-60% of the rated current, when a certain connection point in the loop has a fault of poor contact caused by improper plugging, spring elasticity reduction or failure after long-term use, the loop has limited heat generation, the monitored temperature also does not reach a threshold value, and the fault cannot be identified for early warning. Therefore, the method of monitoring only the temperature parameter has certain limitations and hidden dangers.
The conventional alarm methods comprise a temperature threshold value method, a temperature rise rate method, a similar temperature difference comparison method and a relative temperature difference method, which are algorithms for temperature detection, and a single temperature algorithm has the defects of insufficient plugging, three-phase imbalance and other common faults, and needs to be combined by multiple methods to comprehensively judge the working state of equipment.
The current common technical scheme has only a single alarm function, does not have a function of carrying out safety defect analysis alarm in a grading way, and does not have an intelligent function of carrying out safety processing suggestion according to the defect alarm grade.
Disclosure of Invention
In order to solve the above problems, the present invention provides the following technical solutions: the utility model provides a system for cubical switchboard connector safety monitoring is provided with in the cubical switchboard in order to connect a plurality of return circuit plug connectors of the power supply of inserting, includes:
n miniature temperature tag sensors for detecting the operating temperatures of the three-phase conductors A, B and C of the n connectors;
n miniature stress label sensors for measuring the contact stress of the three-phase conductors A, B and C of the n connectors;
a reader for receiving the A, B, C three-phase conductor operating temperature signals of the n connectors transmitted by the n miniature temperature tag sensors and the A, B, C three-phase conductor contact stress signals of the n connectors transmitted by the n miniature stress tag sensors;
the intelligent controller receives the temperature signals and the contact stress signals of the n connectors transmitted by the reader, stores the temperature signals and the contact stress signals of the n connectors, respectively judges the safety level faults of the temperature signals and the contact stress signals of the n connectors, compares the safety fault levels, and outputs the highest level safety fault signals of the connectors with faults.
And the display module is used for receiving the highest-level fault signal of the connector with the fault transmitted by the intelligent controller and respectively alarming and displaying the highest-level fault signal of the connector with the fault.
Further, the miniature temperature label sensor and the miniature stress label sensor are fixed on the inner conductor of the connector.
A safety monitoring method for a switch cabinet connector comprises the following steps:
an acquisition step: acquiring temperature signals and contact stress signal data of n connectors;
a pretreatment step: respectively filtering the temperature signals and the contact stress signal data of the n connectors;
and (3) temperature fault judgment: the temperature values of the n connectors are subjected to safety fault level judgment according to a temperature multilevel threshold value method and a relative temperature difference method respectively, and two temperature safety fault level signals of the connectors with faults are output;
stress fault judging step: judging the safety fault level of the stress values of the n connectors according to a stress threshold method, and outputting a stress safety level fault signal of the connector with the fault;
a comprehensive judgment step: and comparing the two temperature safety fault level signals of the connector with the fault with the stress safety fault level signal of the connector with the fault, and outputting the highest-level fault signal of the connector with the fault.
Further, the process of judging the safety fault level of the temperature values of the n connectors according to the temperature multi-level threshold method is as follows:
real-time temperature value T detected by n-path plug-in unit conductor connection points and preset temperature threshold value T G 、T S 、T E Carrying out comparison, wherein T E ＞T S ＞T G ；
When T is less than T G Judging that the temperature of the connector does not have the safety defect fault;
when T is S ＞T≥T G Judging that the temperature of the connector has a common safety defect fault;
when T is E ＞T≥T S Judging that the temperature of the connector has serious safety defect fault;
when T is more than or equal to T E And judging that the temperature of the connector has an emergency safety defect fault.
Further, the process of judging the safety fault level by using the relative temperature difference method for the temperature values of the n connectors is as follows:
the relative temperature difference value delta of each connecting conductor in the N-path connecting plug-in unit is compared with a preset relative temperature difference threshold value delta G 、δ S 、δ E Making an alignment in which delta E ＞δ S ＞δ G ；
When delta < delta G Judging that the temperature of the connector does not have the safety defect fault;
when delta S ＞δ≥δ G Judging that the temperature of the connector has a common safety defect fault;
when delta E ＞T≥δ S Judging that the temperature of the connector has serious safety defect fault;
when delta is larger than or equal to delta E And judging that the temperature of the connector has an emergency safety defect fault.
Further, the process of judging the level of the safety fault according to the stress threshold method by the stress values of the n connectors is as follows:
the real-time stress detection value F of the connector is compared with the preset stress value F min The comparison is carried out, and the comparison is carried out,
when F is present<F min Judging that the stress of the connector does not have the safety defect fault;
when F is more than or equal to F min And judging that the stress of the connector has serious safety defect failure.
A safety monitoring device for a switch cabinet connector comprises the following steps:
an acquisition module: the system comprises a temperature acquisition module, a contact stress acquisition module and a control module, wherein the temperature acquisition module is used for acquiring temperature signals and contact stress signal data of n connectors;
a pretreatment step: the device is used for respectively filtering the temperature signals and the contact stress signal data of the n connectors;
temperature fault judgment module: the system is used for judging the safety fault level of the temperature values of the n connectors according to a temperature multilevel threshold value method and a relative temperature difference method respectively and outputting two temperature safety fault level signals of the connectors with faults;
stress fault judgment module: the stress safety grade fault judging module is used for judging the safety fault grade of the stress values of the n connectors according to a stress threshold value method and outputting a stress safety grade fault signal of the connector with the fault;
a comprehensive judgment module: and the device is used for comparing the two temperature safety fault level signals of the connector with the fault with the stress safety fault level signal of the connector with the fault and outputting the highest-level fault signal of the connector with the fault.
The invention provides a switch cabinet connector safety monitoring system and a control method; on the premise of not influencing the insulativity and the mechanical structure of the connector completely, a contact detection scheme is adopted, a micro temperature and stress tag sensor is arranged in the connector, the real-time temperature and stress of a connecting point conductor are measured through direct contact, and a specific algorithm is combined to carry out comprehensive analysis judgment, safety monitoring and graded alarm on the working state of the connector;
the miniature temperature and stress tag sensor adopts ultrahigh frequency electric wave energy to collect and supply power without an external power supply; the detection data is transmitted wirelessly and received by the reader, so that the influence of narrow internal space of the switch cabinet and mutual shielding of electric elements is avoided; no power supply and data cable is used for entering and exiting, and the mechanical structure and the insulation of the connector are not damaged; wiring in the cabinet is reduced.
The comprehensive judgment is carried out by combining the detection of multiple groups of temperature and stress parameters with a specific method, the limitation and hidden danger of only monitoring temperature parameters are overcome, the working state of the connector can be accurately monitored in real time, and early warning, alarming and fault processing are carried out. Even under the condition of low current and no power transmission, faults such as poor contact of the connector, no in-place plugging and the like can be judged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a block diagram of a switch cabinet connector safety monitoring system;
FIG. 2 is a schematic view of the arrangement within the switchgear cabinet;
FIG. 3 (a) is a schematic diagram of a connector built-in stress sensor; (b) a schematic diagram of a temperature sensor built in the connector;
fig. 4 is a flowchart of a control method of the intelligent controller.
Reference numerals: 1.1.1-1.1.3, 1.2.1-1.2.3.. 1.n.1-1.n.3: respectively are miniature temperature label sensors 1-n; 1.1.4-1.1.6, 1.2.4-1.2.6.. 1.n.4-1.n.6: the system comprises miniature temperature tag sensors 1-n, 2, readers, 3, an intelligent controller, 4.2, a fault power circuit breaker I,4.3 a power circuit breaker II,4.4 heat dissipation equipment, 5, a superior electric power remote monitoring system, 6 and a display model.
Detailed Description
It should be noted that, in the case of conflict, the embodiments and features of the embodiments of the present invention may be combined with each other, and the present invention will be described in detail with reference to the accompanying drawings and embodiments.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
For ease of description, spatially relative terms such as "over … …", "over … …", "over … …", "over", etc. may be used herein to describe the spatial positional relationship of one device or feature to another device or feature as shown 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 a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.
FIG. 1 is a block diagram of a switch cabinet connector safety monitoring system; FIG. 2 is a schematic view of the arrangement within the switchgear cabinet; the switch cabinet connector safety monitoring system comprises a micro temperature label sensor 1.1.1-1.1.3, a micro temperature label sensor 1.2.1-1.2.3.. 1.n.1-1.n.3, a micro stress label sensor 1.1.4-1.1.6, a micro stress label sensor 1.2.4-1.2.6.. 1.n.4-1.n.6, a reader 2, an intelligent controller 3 and a display module 6;
the switch cabinet is internally provided with n loop plug connectors in a plug-in mode, namely: 1. 2-n, each connector is internally provided with 1.1.1-1.1.3, 1.2.1-1.2.3. 1.n.1-1.n.3 micro temperature label sensors for measuring the operating temperature of the A, B and C three-phase conductors, and n micro temperature label sensors are used for detecting the operating temperature of the A, B and C three-phase conductors of n connectors;
each connector is internally provided with 1.1.4-1.1.6, 1.2.4-1.2.6. 1.n.4-1.6 miniature stress label sensors for measuring the contact stress of the A, B and C three-phase conductors and n miniature stress label sensors for measuring the contact stress of the A, B and C three-phase conductors of n connectors;
FIG. 3 (a) is a schematic diagram of a connector built-in stress sensor; (b) a schematic diagram of a temperature sensor built in the connector; the miniature stress label sensor and the miniature temperature label sensor are fixed on the inner conductor of the connector in a sticking mode, the function of collecting the temperature and stress signal data of each phase of conductor of the connecting point in the connector is completed, and the miniature temperature label sensor has the characteristics of no damage to the insulation level of equipment, accurate measurement, strong anti-interference capability and good thermal stability.
The reader 2 may be arranged at any suitable location within the cabinet, depending on the arrangement within the cabinet. Receiving real-time temperature detection data of the temperature label sensors 1.1.1-1.1.3 and 1.2.1-1.2.3.. 1.n.1-1.n.3 in a wireless mode; receiving stress label sensor 1.1.4-1.1.6, 1.2.4-1.2.6.. 1.n.4-1.n.6 real-time stress detection data in a wireless mode; and sends the received data to the intelligent controller 3 in the form of digital signals;
the intelligent controller 3 receives the temperature signals and the contact stress signals of the n connectors transmitted by the reader, stores the temperature signals and the contact stress signals of the n connectors, respectively judges the safety level faults of the temperature signals and the contact stress signals of the n connectors, compares the safety fault levels, and outputs the highest-level safety fault signal of the connector with the fault;
the display module 6 receives the highest-level fault signal of the connector with the fault, which is transmitted by the intelligent controller 3, and respectively alarms and displays the highest-level fault signal of the connector with the fault; the display module 6 outputs and displays pre-alarm, alarm and fault processing information in the modes of pictures, graphs, sounds and the like.
The intelligent controller 3 is in bidirectional data communication with the switch cabinet control system 4, on one hand, a control signal is sent to the switch cabinet control system to control the corresponding fault power circuit breaker I4.2 and the power circuit breaker II4.3, and the switching-off and the switching-on of the heat dissipation equipment 4.4 are started to perform fault processing; on one hand, the parameters such as the current of the related loop of the switch cabinet are read as related conditions for fault judgment.
The intelligent controller is provided with a network interface to carry out bidirectional data communication with the electric power remote monitoring system 5, can transmit the self state to the superior electric power remote monitoring system 5, can receive the monitoring parameter setting instruction sent by the superior system, and carries out data communication with the network transmission interface of the superior electric power monitoring system, so that the potential safety hazard can be accurately found, the processing can be carried out in time, the safe operation of the equipment can be guaranteed, and the loss can be reduced to the maximum extent.
A safety monitoring method for a switch cabinet connector comprises the following steps:
an acquisition step: acquiring real-time temperature and real-time stress data T, F of a connecting conductor in a 1-n loop connector;
a pretreatment step: respectively filtering the temperature signals and the contact stress signal data of the n connectors;
and (3) temperature fault judging: the temperature values of the n connectors are subjected to safety fault level judgment according to a temperature multilevel threshold value method and a relative temperature difference method respectively, and two temperature safety fault level signals of the connectors with faults are output;
stress fault judging step: judging the safety fault level of the stress values of the n connectors according to a stress threshold method, and outputting a stress safety level fault signal of the connector with the fault;
a comprehensive judgment step: and comparing the two temperature safety fault level signals of the connector with the fault with the stress safety fault level signal of the connector with the fault, and outputting the highest-level fault signal of the connector with the fault.
Fig. 4 is a flowchart of a control method of the intelligent controller.
The temperature and stress of the switch cabinet connector system are comprehensively judged by combining a temperature multilevel threshold method, a relative temperature difference method and a stress threshold method.
The principle is as follows: the safety failure that the connector caused is the common trouble in cubical switchboard operation, and the reason that breaks down has: overheating due to long-term overload and large current; aging and loosening of the connecting conductor; the condition that the plugging is not in place and the like is directly shown as that the temperature of the connecting conductor is overhigh, the temperature between the connecting conductor and a loop conductor is unbalanced, the contact stress cannot be reached and the like, so that the fault can be found by directly detecting the temperature and the stress of the connecting conductor.
Temperature multi-level thresholding: connecting the conductorsReal-time temperature value T of contact detection and preset temperature threshold value T G 、T S 、T E Carrying out comparison, wherein T E ＞T S ＞T G And judging the level of the safety fault. And setting three levels of general safety defect faults, serious safety defect faults and emergency safety defect faults according to related safety standards.
The process of judging the safety fault level of the temperature values of the n connectors according to the temperature multilevel threshold value method is as follows:
when T is less than T G Judging that the temperature of the connector does not have the safety defect fault;
when T is S ＞T≥T G Judging that the temperature of the connector has a common safety defect fault;
when T is E ＞T≥T S Judging that the connector temperature has serious safety defect fault;
when T is more than or equal to T E And judging that the temperature of the connector has an emergency safety defect fault.
After safety fault level judgment is carried out according to a temperature multilevel threshold value method, a comprehensive judgment step is carried out;
relative temperature difference method: when the fault occurs early, or the load current is small, and the temperature value of the fault point is not enough to trigger threshold value alarm, the relative temperature difference of each connecting conductor in the same connector is calculated by adopting a relative temperature difference method, the relative temperature difference value delta is compared with preset relative temperature difference threshold values delta G, delta S and delta E, the grade of the safety fault is judged, early warning and alarm are carried out, and the rate of missed judgment is reduced. And setting three levels of general safety defect faults, serious safety defect faults and emergency safety defect faults according to related safety standards.
The calculation formula is as follows:
wherein δ is: relative temperature difference; τ 1: temperature rise of the detection point; τ 2: temperature rise of the datum point;
the process of judging the safety fault level of the temperature values of the n connectors by adopting a relative temperature difference method is as follows:
the relative temperature difference value delta of each connecting conductor in the n-path connecting plug-in unit is compared with a preset relative temperature difference threshold value delta G 、δ S 、δ E Making an alignment in which delta E ＞δ S ＞δ G ；
When delta < delta G Judging that the temperature of the connector does not have the safety defect fault;
when delta S ＞δ≥δ G Judging that the temperature of the connector has a common safety defect fault;
when delta E ＞T≥δ S Judging that the temperature of the connector has serious safety defect fault;
when delta is larger than or equal to delta E And judging that the temperature of the connector has an emergency safety defect fault.
Stress threshold method: when the connector is in a connection state, the conductor is aged or loosened or is not inserted in place, the temperature of the conductor is in a thermal safety area, the temperature cannot be triggered, and the contact stress cannot reach a preset value.
The process of judging the safety fault level of the stress values of the n connectors according to a stress threshold value method is as follows:
the real-time stress detection value F of the connector is compared with the preset stress value F min The comparison is carried out, and the comparison is carried out,
when F is present<F min Judging that the stress of the connector does not have the safety defect fault;
when F is more than or equal to F min And judging that the connector has serious safety defect faults due to the stress.
The three methods are combined to perform comprehensive analysis and judgment to realize safety monitoring on the switch cabinet connector system, so that potential safety hazards are accurately found in real time and are processed in time, loss is reduced to the maximum extent, and safe operation of the switch cabinet is guaranteed.
The comprehensive judgment step comprises: and (3) combining the stress fault judging step of the temperature fault judging step, analyzing the 1-n loop connectors respectively, positioning the relevant loops and connectors with safety defects, comprehensively judging, and taking the highest level to output alarm information if various faults exist.
Comprehensive judgment analysis meter
According to the comprehensive judgment analysis table: it can be seen that the intelligent controller 3 finally outputs the highest level fault signal.
When the safety monitoring system has general safety defect faults: the fault connector and the fault loop are positioned, a safety early warning signal is sent out, and the maintenance opportunity of power failure (or period) is utilized to schedule maintenance and eliminate the safety defect in a planned way.
When the safety monitoring system has serious safety defect faults: and positioning the fault connector and the fault loop, sending out a serious safety alarm signal, and immediately arranging a specially-assigned person to eliminate the safety defect.
When the safety monitoring system has an emergency safety defect fault: and positioning the fault connector and the fault loop, sending an emergency safety alarm signal, and sending safety control signals for emergently cutting off a power supply of the corresponding loop, starting heat dissipation equipment and the like to a switch cabinet control system.
A safety monitoring device of a switch cabinet connector comprises the following steps:
an acquisition module: the system comprises a temperature acquisition module, a contact stress acquisition module and a control module, wherein the temperature acquisition module is used for acquiring temperature signals and contact stress signal data of n connectors;
a pretreatment step: the device is used for respectively filtering the temperature signals and the contact stress signal data of the n connectors;
temperature fault judgment module: the system is used for judging the safety fault level of the temperature values of the n connectors according to a temperature multilevel threshold value method and a relative temperature difference method respectively and outputting two temperature safety fault level signals of the connectors with faults;
a stress fault judgment module: the stress safety grade fault judging module is used for judging the safety fault grade of the stress values of the n connectors according to a stress threshold value method and outputting a stress safety grade fault signal of the connector with the fault;
a comprehensive judgment module: the failure detection circuit is used for comparing the two temperature safety failure level signals of the connector with failure with the stress safety failure level signal of the connector with failure and outputting the highest level failure signal of the connector with failure.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. The utility model provides a system for cubical switchboard connector safety monitoring, is provided with in the cubical switchboard in order to connect a plurality of return circuit plug connectors of the mode power supply, its characterized in that: the method comprises the following steps:
n miniature temperature label sensors which are used for detecting the operating temperatures of the A, B and C three-phase conductors of the n connectors and are internally arranged in a sticking mode;
n miniature stress label sensors which are used for measuring the contact stress of the A, B and C three-phase conductors of the n connectors and are internally arranged in a pasting mode;
a reader for receiving the A, B, C three-phase conductor operating temperature signals of the n connectors transmitted by the n miniature temperature tag sensors and the A, B, C three-phase conductor contact stress signals of the n connectors transmitted by the n miniature stress tag sensors;
the intelligent controller is used for receiving the temperature signals and the contact stress signals of the n connectors transmitted by the reader, storing the temperature signals and the contact stress signals of the n connectors, respectively judging the safety level faults of the temperature signals and the contact stress signals of the n connectors, comparing the safety fault levels, and outputting the highest-level safety fault signal of the connector with the fault;
the step of respectively carrying out safety grade fault judgment on the temperature signals and the contact stress signals of the n connectors comprises respectively carrying out safety fault grade judgment on the temperature signals of the n connectors according to a temperature multilevel threshold method and a relative temperature difference method, and outputting two temperature safety fault grade signals of the connectors with faults; judging the stress safety fault level of the stress signals of the n connectors according to a stress threshold value method, and outputting a stress safety level fault signal of the connector with a fault;
the miniature temperature label sensor and the miniature stress label sensor are fixed on the inner conductor of the connector in a sticking mode.
2. The system for safety monitoring of the switch cabinet connector according to claim 1, wherein: the intelligent controller comprises a display module for receiving the highest-level fault signal of the connector with the fault, which is transmitted by the intelligent controller, and respectively alarming and displaying the highest-level fault signal of the connector with the fault.
3. A safety monitoring method for a switch cabinet connector is characterized by comprising the following steps: the method comprises the following steps:
an acquisition step: acquiring temperature signals and contact stress signal data of n connectors;
a pretreatment step: respectively filtering the temperature signals and the contact stress signal data of the n connectors;
and (3) temperature fault judging: the temperature values of the n connectors are subjected to safety fault grade judgment according to a temperature multi-level threshold method and a relative temperature difference method respectively, and two temperature safety fault grade signals of the connectors with faults are output;
stress fault judging step: judging the safety fault level of the stress values of the n connectors according to a stress threshold method, and outputting a stress safety level fault signal of the connector with the fault;
a comprehensive judgment step: and comparing the two temperature safety fault level signals of the connector with the fault with the stress safety fault level signal of the connector with the fault, and outputting the highest-level fault signal of the connector with the fault.
4. The safety monitoring method for the switch cabinet connector as claimed in claim 3, wherein the method comprises the following steps: the process of judging the safety fault level of the temperature values of the n connectors according to the temperature multilevel threshold value method is as follows:
real-time temperature value T detected by n-path plug-in unit conductor connection points and preset temperature threshold value T G 、T S 、T E Carrying out comparison, wherein T E ＞T S ＞T G ；
When T is less than T G Judging that the temperature of the connector does not have the safety defect fault;
when T is S ＞T≥T G Judging that the temperature of the connector has a common safety defect fault;
when T is E ＞T≥T S Judging that the temperature of the connector has serious safety defect fault;
when T is more than or equal to T E And judging that the temperature of the connector has an emergency safety defect fault.
5. The safety monitoring method for the switch cabinet connector as claimed in claim 3, wherein the method comprises the following steps: the process of judging the safety fault level of the temperature values of the n connectors by adopting a relative temperature difference method is as follows:
the relative temperature difference value delta of each connecting conductor in the N-path connecting plug-in units is compared with a preset relative temperature difference threshold value delta G 、δ S 、δ E Making an alignment in which delta E ＞δ S ＞δ G ；
When delta < delta G Judging that the temperature of the connector does not have the safety defect fault;
when delta S ＞δ≥δ G Judging that the temperature of the connector has a common safety defect fault;
when delta E ＞T≥δ S Judging that the temperature of the connector has serious safety defect fault;
when delta is larger than or equal to delta E And judging that the temperature of the connector has an emergency safety defect fault.
6. The safety monitoring method for the switch cabinet connector as claimed in claim 3, wherein the method comprises the following steps: the process of judging the safety fault level of the stress values of the n connectors according to a stress threshold value method is as follows:
the real-time stress detection value F of the connector is compared with the preset stress value F min The comparison is carried out, and the comparison is carried out,
when F is<F min Judging that the stress of the connector does not have the safety defect fault;
when F is more than or equal to F min And judging that the stress of the connector has serious safety defect failure.
7. The utility model provides a safety monitoring device of cubical switchboard connector which characterized in that: the method comprises the following steps:
an acquisition module: the system comprises a temperature acquisition module, a contact stress acquisition module and a control module, wherein the temperature acquisition module is used for acquiring temperature signals and contact stress signal data of n connectors;
a pretreatment step: the device is used for respectively filtering the temperature signals and the contact stress signal data of the n connectors;
temperature fault judgment module: the system is used for judging the safety fault grade of the temperature values of the n connectors according to a temperature multi-level threshold method and a relative temperature difference method respectively and outputting two temperature safety fault grade signals of the connectors with faults;
stress fault judgment module: the stress safety grade fault judging module is used for judging the safety fault grade of the stress values of the n connectors according to a stress threshold value method and outputting a stress safety grade fault signal of the connector with the fault;
a comprehensive judgment module: the failure detection circuit is used for comparing the two temperature safety failure level signals of the connector with failure with the stress safety failure level signal of the connector with failure and outputting the highest level failure signal of the connector with failure.
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