CN114325543A - Current transformer abnormity monitoring device and control method - Google Patents
Current transformer abnormity monitoring device and control method Download PDFInfo
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Abstract
The application relates to a current transformer abnormity monitoring device and a control method. The control method comprises the following steps: the induction module comprises a field effect tube and a light-emitting element; the field effect tube is used for inducing the secondary side voltage of the current transformer; the light-emitting element is used for changing a light-emitting state according to the secondary side voltage; the photosensitive module comprises a photosensitive resistance sensor and a detection module; the photoresistance sensor is used for controlling the on-off state of the detection module according to the light-emitting state of the light-emitting element; the detection module comprises a first detection switch; the alarm module comprises a signal element connected with the first detection switch in series; the signal element is arranged at the terminal row of the protection measurement and control cabinet and used for sending out an abnormal signal of the current transformer according to the opening and closing state of the first detection switch. The secondary side open circuit fault of the inductive current transformer can be induced, an abnormal signal of the current transformer can be sent out in time, and electric shock caused by contact with overvoltage when a worker checks a circuit is avoided, so that safety is improved.
Description
Technical Field
The application relates to the technical field of mutual inductor monitoring, in particular to a current mutual inductor abnormity monitoring device and a control method.
Background
The current transformer is an important component device in a power system, and provides metering, measuring and protecting functions for safe operation of power. Once a current transformer breaks down, a relay protection device can malfunction seriously, a circuit breaker is tripped, power supply is interrupted, and production safety is damaged. When the current transformer works normally, the voltage of the secondary side is extremely low; when the secondary side of the current transformer is opened, on one hand, abnormal overvoltage is generated to damage the insulation strength of the secondary side, and then the insulation burning loss of the secondary side of the equipment is caused; on the other hand, the current transformer iron core is saturated rapidly, and irreversible damage can be caused to the inside of the equipment.
At present, when a current transformer is checked to be abnormal, if the load of a primary side of the current transformer is not large, the secondary side of the current transformer is zero or very small, and when a current loop for measurement is not opened, the secondary side open-circuit fault of the current transformer is difficult to identify; if the staff on duty directly checks the current transformer terminal strip of the rear cabinet of the protection and measurement control panel of the nearby control room, for example, whether the terminal strip has loose wiring and loose connecting pieces is checked, and at the moment, the current transformer terminal strip is most easily subjected to electric shock due to the contact with overvoltage.
In the implementation process, the inventor finds that at least the following problems exist in the conventional technology:
the current transformer abnormity monitoring mode or the traditional method has the problems of low safety and the like.
Disclosure of Invention
In view of the above, it is necessary to provide a current transformer abnormality monitoring apparatus and a control method capable of improving safety in view of the above technical problems.
In order to achieve the above object, in one aspect, an embodiment of the present application provides a current transformer abnormality monitoring apparatus, including:
the induction module comprises a field effect tube and a light-emitting element; the field effect tube is used for inducing the secondary side voltage of the current transformer; the light-emitting element is used for changing a light-emitting state according to the secondary side voltage;
the photosensitive module is connected with the sensing module; the photosensitive module comprises a photosensitive resistance sensor and a detection module; the photoresistance sensor is used for controlling the on-off state of the detection module according to the light-emitting state of the light-emitting element; the detection module comprises a first detection switch;
the alarm module is connected with the photosensitive module; the alarm module comprises a signal element connected with the first detection switch in series; the signal element is arranged at the terminal row of the protection measurement and control cabinet and used for sending out an abnormal signal of the current transformer according to the opening and closing state of the first detection switch.
In one embodiment, the detection module further comprises a second detection switch; the device still includes:
the atomization module is arranged inside the terminal box and is connected with the photosensitive module; the atomization module comprises an atomizer connected with the second detection switch in series; the atomizer is used for determining whether to generate atomizing gas according to the on-off state of the second detection switch.
In one embodiment, the method further comprises the following steps:
the shielding module is connected with the sensing module; the shielding module is arranged on the inner surface of a terminal box of the current transformer and is used for shielding primary side electromagnetic interference of the current transformer; the shielding module is used for eliminating overvoltage by contacting atomizing gas in the interior of the terminal box.
In one embodiment, the sensing module further comprises:
one end of the first switch is used for being connected with a power supply;
the anode of the diode is connected with the cathode of the light-emitting element; the positive electrode of the light-emitting element is connected with the other end of the first switch; the cathode of the diode is grounded;
one end of the resistor is connected with the positive electrode of the light-emitting element; the other end of the resistor is connected with the drain electrode of the field effect transistor;
one end of the capacitor is connected with the other end of the resistor; the other end of the capacitor is connected with the negative electrode of the light-emitting element;
the antenna is connected with the grid electrode of the field effect tube; the source electrode of the field effect transistor is grounded.
In one embodiment, the detection module further comprises a third detection switch;
the alarm module also comprises an alarm connected with the third detection switch in series; the alarm is used for sending an alarm signal to the terminal according to the opening and closing state of the third detection switch.
In one embodiment, the light emitting element is a light emitting diode; the field effect transistor is a P-channel field effect transistor; the resistor is a carbon film resistor; the capacitor is an electrolytic capacitor.
In one embodiment, the shielding module is a polyester cloth plated with nickel and copper metal.
The embodiment of the application provides a current transformer abnormity monitoring control method based on the device, which comprises the following steps:
controlling the light emitting state of the light emitting element according to the secondary side voltage of the current transformer;
controlling the open-close state of the detection module according to the light-emitting state of the light-emitting element; and sending an abnormal signal of the current transformer according to the opening and closing state of the first detection switch.
In one embodiment, the method further comprises the following steps:
whether the atomizing gas is generated or not is determined according to the on-off state of the second detection switch.
In one embodiment, the method further comprises the following steps:
and sending an alarm signal to the terminal according to the opening and closing state of the third detection switch.
One of the above technical solutions has the following advantages and beneficial effects:
in the current transformer abnormity monitoring device provided by the application, a module arranged in a terminal box is connected with a current transformer secondary side device in the terminal box in a non-series mode and is not in direct contact, so that the current transformer abnormity monitoring device is convenient to install and does not influence the safe operation of the device; the secondary side of the current transformer can be induced to generate an open circuit fault and send out an abnormal signal of the current transformer in time, so that a worker is reminded of the occurrence of the open circuit fault on the secondary side of the current transformer, and the electric shock caused by the contact of the worker with overvoltage when the worker checks a circuit is avoided, so that the safety in the operation process is improved.
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 an equivalent circuit schematic of an exemplary current transformer;
FIG. 2 is a non-sinusoidal curve of secondary open circuit voltage versus core flux variation for an exemplary current transformer;
FIG. 3 is a block diagram showing an example of the structure of an abnormality monitoring apparatus for a current transformer;
FIG. 4 is a block diagram of an anomaly monitoring device for a current transformer in another embodiment;
FIG. 5 is a circuit schematic of an embodiment of a sense module;
fig. 6 is a first schematic flow chart diagram of a current transformer abnormality monitoring control method in one embodiment.
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 set forth 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.
Spatial relational terms, such as "under," "below," "under," "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. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or 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.
It should be noted that, as shown in fig. 1, in the equivalent circuit schematic diagram of the current transformer, the secondary impedance is Z2＝XS+RS+Zb(ii) a Wherein, XSIs a secondary winding reactance, RSIs the resistance of the secondary winding, ZbIs the load impedance; current error X ═ Ie/(Ie+IS) (ii) a Wherein, IeFor exciting current, ISIs a secondary current.
In normal operation, the secondary side of the current transformer is short-circuited, ZbMuch smaller than the excitation reactance Ze，ISIs far greater than IeThrough Z is flowing overeCurrent of (I)eSo that the secondary side loop of the mutual inductor generates a certain current error X. At this time, the secondary side voltage U2＝[(1-X)IP/K]ZbWherein K is the transformation ratio, IPIs the primary current.
When the current transformer is opened secondarily, the external load circuit is opened, and the secondary side voltage U is at the moment2＝(IP/K)Ze. Due to IP/K＝(Ie+IS) When the secondary side is open, IS＝0，IP/K＝IeAnd the secondary induced current is converted into exciting current. Due to ZeZ far greater than near short circuit during normal operationbAnd when in normal operation, the current error X is extremely small, (1-X) IPK but and IPA small difference in/K, so that (I)P/K)ZeFar greater than [ (1-X) IP/K]Zb。
When the secondary induction current is completely converted into the exciting current, the magnetomotive force is increased, the magnetic flux of the iron core is rapidly saturated, and when the magnetic flux of the iron core reaches the limit, the excitation impedance ZeMinimum, i.e. secondary side voltage U in open circuit state after flux saturation of the core of the current transformer2＝(IP/K)ZeThe temperature is sharply reduced and repeated; as shown in fig. 2, the secondary open-circuit voltage is u, the magnetic induction of the core is B, the magnetic field strength of the core is H, and the time is t.
Furthermore, the current transformer has an open circuit on the secondary side, which causes interference to the circuit or misoperation of equipment if the current transformer is light, and causes a large amount of electric energy loss; and the electric shock accident of the operator is caused. Specifically, after the secondary side of the current transformer is opened, overvoltage is generated in a terminal box of the secondary side, and meanwhile, the overvoltage reaches a terminal row of the current transformer along a secondary side wiring loop of the current transformer. The current transformer terminal row department has the short even piece (the short even piece is used for the screwdriver to loosen even piece screw after, slides the disconnection left, slides the short circuit right, makes things convenient for the maintenance test), if the person on duty discovers that monitoring current disappears or the kilowatt-hour meter amplification is 0, often can inspect earlier the current transformer terminal row of cabinet behind the control room protection survey control panel that is nearest, whether take place to work a telephone switchboard not hard up and link the piece not hard up, gets an electric shock because of contacting the overvoltage at this moment most easily. In order to solve the problem, the application provides a current transformer abnormity monitoring device and a control method, which can improve the safety of the current transformer after the secondary side of the current transformer is opened.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 3, the present application provides a current transformer abnormality monitoring apparatus, including:
a sensing module 110 including a field effect transistor and a light emitting element; the field effect tube is used for inducing the secondary side voltage of the current transformer; the light-emitting element is used for changing a light-emitting state according to the secondary side voltage;
specifically, when the current transformer normally works, the secondary side voltage is extremely low and can be ignored, the field effect tube has no response to the secondary side voltage of the current transformer, and the light-emitting element is in a non-light-emitting state; when the secondary side of the current transformer is open-circuited, abnormal overvoltage is caused, the field effect tube passes through the secondary side voltage of the contactless induction current transformer, and the light-emitting element can be changed into a light-emitting state according to the secondary side voltage;
in some examples, the light emitting element may be a light emitting diode, which may be in a state of periodically emitting light; the field effect transistor can be a P-channel field effect transistor;
a photosensitive module 120 connected to the sensing module 110; the photosensitive module 120 includes a photosensitive resistance sensor and a detection module; the photoresistance sensor is used for controlling the on-off state of the detection module according to the light-emitting state of the light-emitting element; the detection module comprises a first detection switch;
specifically, after the photoresistance sensor is illuminated by the light-emitting element in the light-emitting state, the open-close state of the detection module is controlled to be changed from the normally open state to the closed state; wherein, the first detection switch changes from a normally open state to a closed state.
In some examples, the first detection switch is a first normally open contact of the detection module.
The alarm module 130 is connected with the photosensitive module 120; the alarm module 130 includes a signal element in series with a first detection switch; the signal element is arranged at the terminal row of the protection measurement and control cabinet and used for sending out an abnormal signal of the current transformer according to the opening and closing state of the first detection switch.
Specifically, when the first detection switch is changed from a normally open state to a closed state, the signal element sends out an abnormal signal of the current transformer; the abnormal signal of the current transformer can be used for warning a person on duty that the current of the monitoring system disappears because the secondary side of the current transformer is open-circuited and the secondary wiring is overvoltage, so that the wiring is not checked by touch;
in some examples, the signaling element may be a device that emits a current transformer abnormality signal by emitting light, for example, a red flash diode is turned on to emit a red flash to indicate that the current transformer is abnormal;
in one embodiment, the detection module further comprises a second detection switch; as shown in fig. 4, the apparatus further comprises:
the atomization module 140 is arranged inside the terminal box and connected with the photosensitive module 120; the atomization module 140 includes an atomizer in series with a second detection switch; the atomizer is used for determining whether to generate atomizing gas according to the on-off state of the second detection switch.
Specifically, after the photoresistance sensor is illuminated by the light-emitting element in the light-emitting state, the open-close state of the detection module is controlled to be changed from the normally open state to the closed state; the second detection switch is changed from a normally open state to a closed state; the atomizer can be a micro atomizer; after the second detection switch is changed from a normally open state to a closed state, the atomizer starts to work and generates atomizing gas, and the atomizing gas has conductivity; for example, the liquid is atomized into a mist and gradually fills the inside of the terminal box; the atomized gas is filled in the cavity space inside the terminal box in a short time, the short-circuit position does not need to be positioned, secondary side equipment inside the terminal box is integrally covered, and no error exists.
In some examples, the second detection switch is a second normally open contact of the detection module; the liquid may be water, e.g., tap water; the volume of liquid may be 100 mL.
In one embodiment, as shown in fig. 4, the method further includes:
a shielding module 150 connected to the sensing module 110; the shielding module 150 is disposed on an inner surface of a terminal box of the current transformer, and is configured to shield a primary side electromagnetic interference of the current transformer; the shielding module 150 is used to achieve overvoltage elimination by contacting the atomizing gas inside the terminal box.
Specifically, when the current transformer normally works, the high voltage on the primary side of the current transformer can affect the circuit of the current transformer abnormity monitoring device, the shielding module 150 arranged on the inner surface of the terminal box of the current transformer can shield the electromagnetic interference of the high voltage on the primary side of the current transformer, and the 'magnetic' link in the electric-magnetic-electric connection between the primary side of the current transformer and the field effect tube in the terminal box is cut off; the electrical equipment shells are protected and grounded, the terminal box shells of the current transformers are also connected with a ground screen, and the shielding modules 150 contact the atomized gas in the terminal box, so that the secondary side terminal binding posts of the open-circuit current transformers are all contacted with the shielding modules 150 arranged on the inner surface of the terminal box shells; the shielding module 150 has conductivity to realize mutual short circuit and grounding of secondary terminal terminals of the current transformer, which is equivalent to multipoint grounding of the secondary side of the current transformer, and secondary side overvoltage of the current transformer can be eliminated.
In some examples, the shielding module 150 may be a conductive material, for example, the shielding module 150 may be a polyester fabric cloth coated with nickel and copper metal uniformly applied to the inner surface of the metal shell of the terminal box to effectively shield electromagnetic interference; the shielding module 150 makes all the open-circuit secondary side terminal terminals of the current transformer contact nickel-plated copper metal on polyester fiber cloth on the inner surface of the terminal box shell through contact with the atomized gas in the terminal box; the nickel-plated copper metal has conductivity so as to eliminate secondary side overvoltage of the current transformer.
In one embodiment, as shown in fig. 5, the sensing module 110 further includes:
a first switch SW1, one end of the first switch SW1 is used for connecting with a power supply;
a diode D2, wherein the anode of the diode D2 is connected to the cathode of the light emitting element D1; the positive electrode of the light-emitting element D1 is connected to the other end of the first switch SW 1; the cathode of the diode D2 is grounded;
a resistor R1, one end of the resistor R1 being connected to the anode of the light emitting element D1; the other end of the resistor R1 is connected with the drain D of the field effect transistor;
a capacitor C1, one end of the capacitor C1 being connected to the other end of the resistor R1; the other end of the capacitor C1 is connected to the negative electrode of the light-emitting element D1;
the antenna is connected with the grid G of the field effect tube; the source S of the field effect transistor is grounded.
Specifically, when the antenna connected to the gate G of the fet has no induced voltage (i.e., zero offset), the drain D and the source S of the fet are turned on, and the dc power supply output by the voltage step-down unit forms a loop with the fet through the resistor; the light-emitting element D1 is turned off and is in a non-light-emitting state; the capacitor C1 is charged by the dc voltage.
Further, when an antenna connected with a grid G of the field effect transistor senses alternating voltage, according to the periodicity of the alternating voltage, a reverse voltage appears every T/2 period, so that the drain D and the source S of the field effect transistor are cut off, and after the forward voltage appears every T/2 period, the drain D and the source S of the field effect transistor are restored to be conducted; the above-mentioned steps are repeated and alternated, so that the capacitor C1 is charged when the drain D and the source S of the field effect transistor are turned on, and is discharged when the drain D and the source S of the field effect transistor are turned off; when the capacitor C1 is charged and discharged, the light emitting element D1 emits light from a non-light emitting state when a rated operating voltage is obtained, and the light emitting element D1 emits light from a light emitting state when a rated operating voltage is not obtained.
In some examples, the dc power source forms a loop with the field effect transistor via resistor R1; the on voltage of the light emitting element D1 may be 3.7V, the on voltage of the diode D2 may be 0.2V, the forward on voltage of the light emitting element D1 and the diode D2 connected in series needs to be about 3.9V, and the light emitting element D1 is turned off and does not emit light. The capacitor C1 is charged by the dc voltage, and the capacitor C1 does not discharge, depending on the "all-through-ac" nature of the capacitor. When an ac voltage is applied to the antenna connected to the gate G of the fet, the capacitor C1 is repeatedly charged and discharged according to the periodicity of the ac voltage, and the light-emitting element D1 flickers.
In one embodiment, the detection module further comprises a third detection switch;
the alarm module 130 further includes an alarm connected in series with the third detection switch; the alarm is used for sending an alarm signal to the terminal according to the opening and closing state of the third detection switch.
Specifically, after the photoresistance sensor is illuminated by the light-emitting element in the light-emitting state, the open-close state of the detection module is controlled to be changed from the normally open state to the closed state; the third detection switch is changed from a normally open state to a closed state; when the third detection switch is closed, the direct-current power supply can be output to the alarm; the alarm can send an alarm signal to the terminal for warning the abnormality or fault of the current transformer secondary side, for example, the secondary side open circuit fault of the current transformer;
in some examples, the third detection switch is a third normally open contact of the detection module; when the third normally open contact is closed, the direct current power supply can be output to the alarm; the alarm can send a short message alarm signal to the mobile phone; the alarm device may be built in a SIM (Subscriber Identity Module) card for 4G (the 4th Generation Mobile Communication Technology, fourth Generation Mobile Communication Technology) Communication, which may be used for network Communication.
In one embodiment, the light emitting element is a light emitting diode; the field effect transistor is a P-channel field effect transistor; the resistor R1 is a carbon film resistor R1; the capacitor is an electrolytic capacitor.
Specifically, the turn-on voltage of the light emitting diode may be 3.7V; the power rating of the carbon film resistor may be 1/8W; the rated voltage of the electrolytic capacitor may be 10V; the turn-on voltage of the diode may be 0.2V;
in some examples, the diode may be a 1N60P schottky diode.
In one embodiment, the shielding module 150 is a polyester cloth plated with nickel copper metal.
Specifically, the polyester fiber cloth of nickel-copper metal can be uniformly applied to the inner surface of a terminal box of the current transformer so as to effectively shield the electromagnetic interference of high voltage at the primary side of the current transformer and cut off a 'magnetic' link in the electric-magnetic-electric connection between the primary side of the current transformer and a field effect tube in the terminal box;
in some examples, the matrix of the polyester cloth plated with nickel copper metal can be a highly conductive copper layer with a nickel bonded outer layer having corrosion resistance properties.
In one embodiment, the power supply may provide dc power supplies with different voltages to the sensing module 110, the photosensitive module 120, the alarm module 130 and the atomization module 140 through the voltage reduction unit;
in some examples, the voltage reduction unit may be a DC-DC voltage reducer; the DC-DC voltage reducer can output 12V, 5V, and 3V DC power respectively, wherein the DC-DC voltage reducer can output 5V DC power to the photosensitive module 120; the DC-DC voltage reducer may output a 3V DC power to the sensing module 110; the DC-DC voltage reducer can respectively output a 12V direct-current power supply to the alarm module 130 and the atomization module 140; the power consumption of the power supply is low, only the 3V direct current power supply and the 5V direct current power supply continuously supply power, the alarm module and the atomization module work only after the photosensitive resistance sensor is illuminated, and the electric energy consumption is low.
In some examples, the power supply further includes a lithium battery pack disposed inside the terminal box and a solar panel disposed outside the terminal box; the lithium battery pack is connected with the solar panel. The solar panel can be arranged on the outer surface of the metal shell of the terminal box and is electrically connected with the internal lithium battery pack through a cable hole in the bottom of the terminal box; the solar energy absorbed by the solar panel is converted into electric energy and then stored in the lithium battery pack; the lithium battery pack provides direct current power supplies with different voltages to the photosensitive module 120, the induction module 110, the alarm module 130 and the atomization module 140 through the DC-DC voltage reducer respectively; the lithium battery pack can be a 18650 lithium battery pack; the rated voltage of the lithium battery pack can be 12V; the lithium battery is powered by the solar panel, and the device does not need to be provided with a complicated external outgoing line for accessing a large power supply and a signal cable.
In some examples, when the current transformer is subjected to preventive maintenance or fault treatment, if a cover of the secondary terminal of the body needs to be opened, a main power switch in the current transformer abnormality monitoring device is turned off, so that misoperation of the photosensitive module and false starting of the atomization module and the alarm module are avoided. Because the atomized gas (such as water vapor) does not have any damage to the equipment, when the power failure is maintained, the equipment cannot be damaged even if the secondary side terminal box cover of the current transformer is opened in malfunction.
In some examples, the detection module further comprises a fourth detection switch (e.g., a fourth normally open contact of the detection module) and a fifth detection switch (e.g., a fifth normally open contact of the detection module); the device still includes the monitoring module of making a video recording of establishing ties with the fourth detection switch to and the pickup monitoring module of establishing ties with the fifth detection switch, the monitoring module of making a video recording and pickup monitoring module all are located the inside of terminal box and are connected with the power. When the current transformer normally works, the fourth detection switch and the fifth detection switch are in normally open states, the camera monitoring module and the pickup monitoring module do not work, and power consumption is not obviously increased; when the secondary side of the current transformer is abnormal (for example, end screen earth fault), the fourth detection switch and the fifth detection switch are changed from a normally open state to a closed state, and the camera shooting monitoring module and the sound pickup monitoring module work and are respectively used for sending video data and sound data in the terminal box to a terminal (for example, a mobile phone).
In one embodiment, as shown in fig. 6, the present application provides a current transformer abnormality monitoring control method based on the above apparatus, including:
s610, controlling the light emitting state of the light emitting element according to the secondary side voltage of the current transformer;
s620, controlling the opening and closing state of the detection module according to the light emitting state of the light emitting element; and sending an abnormal signal of the current transformer according to the opening and closing state of the first detection switch.
Specifically, the light-emitting element controls the light-emitting state according to the secondary side voltage of the current transformer; the photoresistance sensor controls the on-off state of the detection module according to the light-emitting state of the light-emitting element; the detection module comprises a first detection switch; the signal element sends out an abnormal signal of the current transformer according to the opening and closing state of the first detection switch;
in some examples, the light emitting diode controls a light emitting state according to a secondary side voltage of the current transformer; the on-off state of the detection module is controlled by the photosensitive resistance sensor according to the light-emitting state of the light-emitting diode; the red flash diode emits red flash according to the opening and closing state of the first normally open contact of the detection module to indicate that the current transformer is abnormal.
It should be understood that, although the steps in the flowchart of fig. 6 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 a portion of the steps in fig. 6 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
In one embodiment, the method further comprises the following steps:
whether the atomizing gas is generated or not is determined according to the on-off state of the second detection switch.
Specifically, the detection module further comprises a second detection switch; the atomizer determines whether to generate atomizing gas according to the on-off state of the second detection switch;
in some examples, the micro-atomizer determines whether to generate the atomizing gas according to the open-close state of the second normally-open contact of the detection module.
In one embodiment, the method further comprises the following steps:
and sending an alarm signal to the terminal according to the opening and closing state of the third detection switch.
Specifically, the detection module further comprises a third detection switch; and the alarm module sends an alarm signal to the terminal according to the on-off state of the third detection switch.
In some examples, the alarm sends a short message alarm signal to the mobile phone according to the opening and closing state of the third normally open contact of the detection module.
In one embodiment, the present application provides a current transformer abnormality monitoring control apparatus, including: light control module and unusual alarm module, wherein:
the light emitting control module is used for controlling the light emitting state of the light emitting element according to the secondary side voltage of the current transformer;
the abnormity alarm module is used for controlling the opening and closing state of the detection module according to the light emitting state of the light emitting element; the current transformer abnormal signal is sent out according to the opening and closing state of the first detection switch.
In one embodiment, the current transformer abnormality monitoring and controlling device further comprises an atomization control module for determining whether to generate the atomized gas according to the on-off state of the second detection switch.
In one embodiment, the abnormality alarm module is further configured to send an alarm signal to the terminal according to the on-off state of the third detection switch.
For specific limitations of the current transformer abnormality monitoring control device, reference may be made to the above limitations of the current transformer abnormality monitoring method, and details are not described here. All modules in the current transformer abnormity monitoring and controlling device can be wholly or partially realized through software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
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 application. In this specification, a schematic description of the above terminology may 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 more specific and detailed, but not construed 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 shall be subject to the appended claims.
Claims (10)
1. An abnormality monitoring device for a current transformer, comprising:
the induction module comprises a field effect tube and a light-emitting element; the field effect tube is used for inducing the secondary side voltage of the current transformer; the light-emitting element is used for changing a light-emitting state according to the secondary side voltage;
the photosensitive module is connected with the sensing module; the photosensitive module comprises a photosensitive resistance sensor and a detection module; the photoresistance sensor is used for controlling the opening and closing state of the detection module according to the light emitting state of the light emitting element; the detection module comprises a first detection switch;
the alarm module is connected with the photosensitive module; the alarm module comprises a signal element connected with the first detection switch in series; the signal element is arranged at a terminal row of the protection measurement and control cabinet and used for sending out an abnormal signal of the current transformer according to the opening and closing state of the first detection switch.
2. The current transformer abnormality monitoring device according to claim 1, wherein said detection module further comprises a second detection switch; the device further comprises:
the atomization module is arranged inside the terminal box and is connected with the photosensitive module; the atomization module comprises an atomizer connected with the second detection switch in series; the atomizer is used for determining whether to generate atomizing gas according to the on-off state of the second detection switch.
3. The current transformer abnormality monitoring device according to claim 2, characterized by further comprising:
the shielding module is connected with the induction module; the shielding module is arranged on the inner surface of a terminal box of the current transformer and is used for shielding primary side electromagnetic interference of the current transformer; the shielding module is used for eliminating overvoltage by contacting the atomized gas in the terminal box.
4. The current transformer abnormality monitoring device according to claim 1, wherein said induction module further comprises:
the first switch, one end of the said first switch is used for connecting with power;
the anode of the diode is connected with the cathode of the light-emitting element; the positive electrode of the light-emitting element is connected with the other end of the first switch; the cathode of the diode is grounded;
a resistor, one end of which is connected to a positive electrode of the light emitting element; the other end of the resistor is connected with the drain electrode of the field effect transistor;
a capacitor having one end connected to the other end of the resistor; the other end of the capacitor is connected with the negative electrode of the light-emitting element;
the antenna is connected with the grid electrode of the field effect tube; and the source electrode of the field effect transistor is grounded.
5. The current transformer abnormality monitoring device according to claim 1, wherein said detection module further includes a third detection switch;
the alarm module further comprises an alarm connected with the third detection switch in series; and the alarm is used for sending an alarm signal to a terminal according to the on-off state of the third detection switch.
6. The current transformer abnormality monitoring device according to claim 4,
the light-emitting element is a light-emitting diode; the field effect transistor is a P-channel field effect transistor; the resistor is a carbon film resistor; the capacitor is an electrolytic capacitor.
7. The current transformer abnormality monitoring device according to claim 3,
the shielding module is polyester fiber cloth plated with nickel and copper metals.
8. A current transformer abnormity monitoring control method based on the device of any one of claims 1 to 7, characterized by comprising the following steps:
controlling the light emitting state of the light emitting element according to the secondary side voltage of the current transformer;
controlling the opening and closing state of the detection module according to the light emitting state of the light emitting element; and sending an abnormal signal of the current transformer according to the opening and closing state of the first detection switch.
9. The current transformer abnormality monitoring control method according to claim 8, characterized by further comprising the steps of:
and determining whether to generate the atomizing gas according to the opening and closing state of the second detection switch.
10. The current transformer abnormality monitoring control method according to claim 8, characterized by further comprising the steps of:
and sending an alarm signal to a terminal according to the on-off state of the third detection switch.
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| CN114325543B (en) | 2024-03-22 |
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