CN114325541B - Current transformer abnormality monitoring device, control method and power equipment terminal box - Google Patents
Current transformer abnormality monitoring device, control method and power equipment terminal box Download PDFInfo
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Abstract
The application relates to a current transformer abnormality monitoring device, a control method and a power equipment terminal box. Wherein, the device includes: the induction module comprises a field effect transistor and a light-emitting element; the field effect transistor is used for inducing the secondary side voltage of the current transformer; the light-emitting element is used for changing the light-emitting state according to the secondary side voltage; the photosensitive module comprises a photosensitive resistor sensor and a detection module; the photoresistor sensor is used for controlling the opening and closing states of the detection module according to the luminous states of the luminous elements; the atomization module comprises an atomizer connected in series with the first detection switch; the atomizer is used for determining whether atomizing gas is generated according to the opening and closing state of the first detection switch; the shielding module is used for shielding electromagnetic interference of the primary side of the current transformer and realizing ground connection of the bushing end screen through atomized gas in the contact terminal box. The ground protection is provided when the sleeve end screen of the current transformer can be induced to fail, the sleeve end screen defect is eliminated in time, the expansion of accidents is avoided, and the system safety is improved.
Description
Technical Field
The application relates to the technical field of transformer monitoring, in particular to a current transformer abnormality monitoring device, a control method and a power equipment terminal box.
Background
Along with the improvement of the rated voltage level of the current transformer, the primary internal insulation of the power equipment generally adopts a capacitive insulation structure, namely, the main insulation layer of the equipment is wrapped by insulating materials (oil-immersed cable paper) and capacitive screens (aluminum foils), and the purpose of uniformly distributing the internal insulation field intensity is achieved by adjusting the radial thickness between the capacitive screens. The outermost capacitive screen of the current transformer, which is close to the secondary winding, is the last (ground) screen, and must be reliably grounded during operation. If a bushing end screen fault occurs, for example, the bushing end screen is broken in ground or is poor in ground, a capacitor is formed between the bushing end screen and the ground, so that the intensity distribution of an internal insulation electric field of the current transformer is extremely uneven, under the action of the electric field force, the internal insulation electric charges can gather towards the bushing end screen, and abnormal overvoltage is caused by the concentration of the field intensity; if the device is light, abnormal sound of operation of the device or tripping of a switch is caused, if the device is heavy, the device is exploded or catches fire, the safe and stable operation of a power grid is seriously affected, and the safety of patrolling personnel is greatly threatened.
At present, the current transformer abnormality monitoring control method aims at the fault of the bushing end screen, and needs to be electrically connected with the current transformer body during installation and setting, for example, a measurement protection device is connected in series or in parallel to a circuit and the like, so that equipment such as the current transformer which runs normally due to the fault of the measurement protection device inevitably fails. In addition, the current abnormal monitoring control method of the current transformer cannot autonomously eliminate the fault of the bushing end screen, and ensures the reliable grounding of the bushing end screen.
In the implementation process, the inventor finds that at least the following problems exist in the conventional technology:
the current abnormal monitoring mode or the traditional method of the current transformer has the problems that the ground protection can not be provided while the fault of the bushing end screen of the current transformer is monitored.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a current transformer abnormality monitoring device, a control method, and a power equipment terminal box that are capable of monitoring a fault of a bushing tap of a current transformer while providing ground protection.
In order to achieve the above object, in one aspect, an embodiment of the present application provides a current transformer abnormality monitoring device, including:
the induction module comprises a field effect transistor and a light-emitting element; the field effect transistor is used for inducing the secondary side voltage of the current transformer; the light-emitting element is used for changing the light-emitting state according to the secondary side voltage;
the photosensitive module is connected with the sensing module; the photosensitive module comprises a photosensitive resistor sensor and a detection module; the photoresistor sensor is used for controlling the opening and closing states of the detection module according to the luminous states of the luminous elements; the detection module comprises a first detection switch;
the atomization module is arranged in the terminal box and is connected with the photosensitive module; the atomization module comprises an atomizer connected in series with the first detection switch; the atomizer is used for determining whether atomizing gas is generated according to the opening and closing state of the first detection switch;
the shielding module is connected with the sensing module; the shielding module is arranged on the inner surface of the 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 realizing bushing tap grounding through the atomizing gas in the interior of the contact terminal box.
In one embodiment, the device further comprises a power supply module respectively connected with the induction module, the photosensitive module and the atomization module; the power supply module comprises a voltage reducing unit; the voltage reducing unit is used for providing direct current power supplies with different voltages.
In one embodiment, the power module further comprises a lithium battery pack arranged inside the terminal box and a solar panel arranged outside the terminal box; the lithium battery pack is connected with the solar panel.
In one embodiment, the sensing module further comprises:
one end of the first switch is connected with the power supply module;
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 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;
a capacitor, one end of which 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 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 detection module further includes a second detection switch;
the device also comprises an alarm connected in series with the second detection switch; the alarm is used for sending an alarm signal according to the opening and closing state of the second detection switch.
In one embodiment, the shielding module is a nickel-copper plated polyester fiber cloth.
The embodiment of the application provides a current transformer abnormality 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 opening and closing states of the detection module according to the light-emitting states of the light-emitting elements; wherein, whether to produce the atomizing gas is determined according to the open-close state of the first detection switch.
In one embodiment, the method further comprises the steps of:
and sending an alarm signal according to the opening and closing state of the second detection switch.
The embodiment of the application provides a power equipment terminal box, which comprises the current transformer abnormality monitoring device.
One of the above technical solutions has the following advantages and beneficial effects:
the current transformer abnormality monitoring device provided by the application has the advantages that the module arranged in the terminal box is connected with the secondary side equipment of the current transformer in the terminal box in a serial-parallel manner and is not in direct contact, so that the installation is convenient, and the safe operation of the equipment is not influenced; the ground protection is provided when the sleeve end screen of the current transformer is in fault, so that the sleeve end screen defect is eliminated in time, the expansion of accidents is avoided, and the safety of the system is improved.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a block diagram of an abnormality monitoring device for a current transformer in one embodiment;
FIG. 2 is a block diagram of an abnormality monitoring device for a current transformer according to another embodiment;
FIG. 3 is a schematic circuit diagram of an induction module in one embodiment;
fig. 4 is a first schematic flow chart of a current transformer anomaly monitoring control method in one embodiment.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described 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 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 the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element.
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 and 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 "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "below" and "under" may include both an upper and a lower orientation. Furthermore, the device may also include an additional orientation (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 should be understood as "electrical connection", "communication connection", and the like if there is transmission of electrical signals or data between objects to be connected.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
The primary winding of the capacitor type current transformer body is U-shaped, and conductors are in the forms of aluminum tubes, copper tubes and the like according to the rated current, and the primary winding is wound into a cylindrical concentric circle structure by a plurality of layers of insulating paper. With the improvement of the rated voltage level of the current transformer, especially the current transformer with the voltage level of 110kV and above, the thickness of the insulating paper wound by the primary winding is also increased, so that the electric field intensity in the insulating paper is more and more uneven, the electric strength of the insulating material is limited, the electric field intensity of the local insulation is caused to exceed the self electric strength due to the uneven electric field intensity, and the overall utilization rate of the insulation is reduced. If some capacitance screens are arranged in the insulating paper, namely tin foil layers between the insulating paper, the insulating layers between every two capacitance screens form a cylindrical capacitor; when the innermost electrode (zero screen) of the capacitor is connected with the high-voltage end of the primary winding of the current transformer and the outermost electrode (bushing end screen) is close to the secondary winding and is connected with the ground, the whole current transformer forms a capacitor which is connected in series between high voltage and the ground by a plurality of capacitors. Under the same insulation thickness, the more the capacitor screens are arranged, the smaller the difference between the radius of the inner electrode and the radius of the outer electrode of each capacitor is, and the smaller the field intensity difference between the surfaces of the inner electrode and the outer electrode is; if the number of intermediate screens is infinite, the field strength difference between the capacitive screens approaches zero. In an actual current transformer, the number of the capacitive screens is limited, the field intensity of each capacitive screen is not completely equal, but the effect of very large uniform field intensity is also achieved, so that the field intensity distribution of all parts of the internal insulation is consistent as much as possible, and the insulation material is utilized to the greatest extent.
The bushing end screen, namely the terminal capacitor screen in the bushing of the current transformer, is positioned in the current transformer and is provided with a tap which leads out the bushing end screen to the inside of the secondary side terminal box of the current transformer through a small porcelain bushing for grounding. The outermost capacitive screen (namely the bushing end screen) of the current transformer is required to be grounded, the current transformer only has the capacitance formed by the capacitive screens, the voltage of each capacitor is equal, the potential of the bushing end screen is zero, and the charges between the two polar plates of the capacitor are equal in quantity and opposite in polarity and can only discharge from the negative plate to the positive plate through an external circuit, so that the charges of the bushing end screen cannot be led into the ground, namely the electric quantity Q of each capacitor in the current transformer is unchanged.
If the bushing end screen is broken or poorly grounded, a capacitor is formed between the bushing end screen and the ground, and the capacitor is far smaller than the capacitor between the capacitor screens in the current transformer, that is, the series capacitors with the same capacitance value from the zero screen to the bushing end screen are connected in series, and if the bushing end screen is broken or poorly grounded, the equivalent capacitor with the small capacitance value is connected in series in the circuit. According to x=1/(2pi fC), where X is the capacitance of the capacitor, C is the capacitance of the capacitor, and f is the frequency of the alternating current, i.e. the capacitance is inversely proportional to the capacitance in case of the same frequency. The capacitance of the equivalent capacitor newly connected in series into the circuit is much larger than the capacitance of the capacitor inside the current transformer. According to the fact that currents in the series circuit are equal everywhere, the electric quantity Q of each capacitor in the current transformer is equal, and the voltage obtained by the equivalent capacitor is far greater than the voltage obtained by the capacitor in the current transformer. Further, the high voltage of the bushing end screen enables the electric field intensity distribution of the internal insulation of the current transformer to be extremely uneven, under the action of the electric field force, the internal insulation charges can gather towards the bushing end screen, after the field intensity is concentrated, surrounding solid media are burnt or carbonized, and a large amount of characteristic gas is decomposed by the insulating oil, so that the chromatographic analysis result of the insulating oil exceeds the standard, and spark discharge to the ground can be generated. Furthermore, the application provides an abnormal current transformer monitoring device, a control method and a terminal box, which can induce the fault of the bushing end screen of the current transformer and simultaneously provide grounding protection, timely eliminate the defect of the bushing end screen, avoid the expansion of accidents and improve the safety of a system.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, the present application provides a current transformer abnormality monitoring device, including:
the sensing module 110 comprises a field effect transistor and a light emitting element; the field effect transistor is used for inducing the secondary side voltage of the current transformer; the light-emitting element is used for changing the light-emitting state according to the secondary side voltage;
specifically, when the current transformer works normally, the secondary side voltage is extremely low and can be ignored, the field effect transistor does not react 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, abnormal overvoltage is caused, the field effect transistor senses the secondary side voltage of the current transformer in a non-contact manner, 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 periodically-emitting state; the field effect transistor can be a P-channel field effect transistor;
the photosensitive module 120 is connected with the sensing module 110; the photosensitive module 120 comprises a photosensitive resistor sensor and a detection module; the photoresistor sensor is used for controlling the opening and closing states of the detection module according to the luminous states of the luminous elements; the detection module comprises a first detection switch;
specifically, after the photoresistor sensor is illuminated by the light-emitting element in a light-emitting state, the opening and closing states of the detection module are controlled to be changed from a normally open state to a closed state; the first detection switch is changed 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 atomization module 130 is arranged in the terminal box and connected with the photosensitive module 120; the atomizing module 130 includes an atomizer in series with a first detection switch; the atomizer is used for determining whether atomizing gas is generated according to the opening and closing state of the first detection switch;
specifically, the atomizer may be a micro atomizer; after the first detection switch is changed from a normally open state to a closed state, the atomizer starts to work and generates atomized gas, and the atomized gas has conductivity; for example, atomizing the liquid into mist and gradually filling the inside of the terminal box; the atomized gas fills the cavity space inside the terminal box in a short time, the short circuit position is not needed to be positioned, the secondary side equipment inside the terminal box is integrally covered, and no error exists.
In some examples, the liquid may be water, e.g., tap water; the volume of liquid may be 100mL.
The shielding module 140 is connected with the sensing module 110; the shielding module 140 is disposed on an 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 140 is used to achieve bushing tip shielding ground by contacting the atomizing gas inside the terminal box.
Specifically, when the current transformer works normally, the primary side high voltage of the current transformer can influence the circuit of the current transformer abnormality monitoring device, and the shielding module 140 arranged on the inner surface of the terminal box of the current transformer can shield electromagnetic interference of the primary side high voltage of the current transformer, so as to cut off a magnetic link in the electric-magnetic-electric connection between the primary side of the current transformer and the field effect tube inside the terminal box; the electrical equipment shells are all protected to the ground, the terminal box shells of the current transformers are also connected with the ground network, and the shielding modules 140 are contacted with the shielding modules 140 arranged on the inner surfaces of the terminal box shells through atomized gas in the contact terminal boxes so that all the bushing end screens with faults are contacted with the shielding modules 140; the shielding module 140 has conductivity to achieve bushing tip shielding ground.
In some examples, the shielding module 140 may be a conductive material, for example, the shielding module 140 may be a nickel-plated copper-metal polyester fiber cloth uniformly applied to an inner surface of the terminal box metal housing to strongly shield electromagnetic interference. The shielding module 140 makes all of the bushing tip screen, where defects (e.g., ground breakage, insulation deterioration) occur, contact nickel-plated copper metal on the polyester fiber cloth of the inner surface of the terminal box housing by contacting the atomized gas inside the terminal box; the nickel-plated copper metal has conductivity to achieve ground of the bushing tip screen.
In one embodiment, as shown in fig. 2, the device further comprises a power module 150 connected to the sensing module 110, the photosensitive module 120 and the atomizing module 130, respectively; the power supply module 150 includes a step-down unit; the voltage reducing unit is used for providing direct current power supplies with different voltages.
Specifically, the power module 150 provides dc power sources with different voltages to the sensing module 110, the photosensitive module 120 and the atomizing module 130 through the voltage reduction unit, respectively;
in some examples, the buck unit may be a DC-DC buck; the DC-DC voltage step-down device can output 12V, 5V and 3V direct current power sources respectively, wherein the DC-DC voltage step-down device can output 12V direct current power sources to the atomization module 130; the DC-DC step-down converter may output a direct current power of 5V to the photosensitive module 120; the DC-DC buck may output a 3V direct current power to the sensing module 110. The power consumption of the power supply module is low, only the 3V direct current power supply and the 5V direct current power supply continuously supply power, the atomization module only works after the photoresistor sensor is illuminated, and the power consumption is low.
In one embodiment, the power module 150 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.
Specifically, the solar panel can be mounted on the outer surface of the metal shell of the terminal box and electrically connected with the internal lithium battery pack through a cable hole at the bottom of the terminal box; solar energy absorbed by the solar panel is converted into electric energy and then stored in the lithium battery pack; the lithium battery pack respectively provides direct current power supplies with different voltages for the induction module 110, the photosensitive module 120 and the atomization module 130 through the voltage reduction unit; the lithium battery is powered by the solar panel, and the device does not need to be provided with complicated external lead wires for large power supply and signal cable access.
In some examples, the lithium battery pack may be a 18650 lithium battery pack; the rated voltage of the lithium battery pack may be 12V; the voltage reduction unit can convert the 12V direct current power supply of the lithium battery pack into 12V, 5V and 3V direct current power supplies for output, wherein the voltage reduction unit can output the 12V direct current power supply to the atomization module 130; the voltage reduction unit can output a direct current power supply of 5V to the photosensitive module 120; the step-down unit may output a 3V dc power to the sensing module 110.
In one embodiment, as shown in fig. 3, the sensing module 110 further includes:
a first switch SW1, one end of the first switch SW1 is connected to the power module 150;
a diode D2, the anode of the diode D2 being 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 positive electrode of the light emitting element D1; the other end of the resistor R1 is connected with the drain electrode 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 electrode G of the field effect tube; the source electrode S of the field effect transistor is grounded.
Specifically, when the antenna connected with the grid electrode G of the field effect tube has no induced voltage (namely zero offset), the drain electrode D and the source electrode S of the field effect tube are conducted, and a direct current power supply output by the voltage reducing unit and the field effect tube form a loop through the resistor; the light emitting element D1 is non-conductive and does not emit light; the capacitor C1 is charged by the dc voltage.
Further, when the antenna connected with the grid electrode G of the field effect tube induces alternating voltage, according to the periodicity of the alternating voltage, reverse voltage appears once every T/2 period, the drain electrode D and the source electrode S of the field effect tube can be cut off, and after forward voltage appears again after T/2 period, the drain electrode D and the source electrode S of the field effect tube are restored to be conducted; the capacitor C1 is charged when the drain electrode D and the source electrode S of the field effect transistor are conducted, and is discharged when the drain electrode D and the source electrode S of the field effect transistor are cut off; when the rated operating voltage is obtained by charging and discharging the capacitor C1, the light emitting element D1 is changed from a non-light emitting state to a light emitting state, and when the rated operating voltage is not obtained by the light emitting element D1, the light emitting state is changed from the light emitting state to the non-light emitting state.
In some examples, the 3V dc power supply output by the step-down unit forms a loop with the field effect transistor via the resistor R1; the turn-on voltage of the light emitting element D1 may be 3.7V, the turn-on voltage of the diode D2 may be 0.2V, and the forward turn-on voltage after the light emitting element D1 and the diode D2 are connected in series may be about 3.9V, and 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, and the capacitor C1 is not discharged according to the characteristic that the capacitor has "cut-off dc. When an alternating voltage is induced to the antenna connected to the gate electrode G of the field effect transistor, the capacitor C1 repeatedly charges and discharges according to the periodicity of the alternating voltage, and the light emitting element D1 blinks.
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.
Specifically, the turn-on voltage of the light emitting diode may be 3.7V; the rated power of the carbon film resistor can 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 detection module further includes a second detection switch; as shown in fig. 2, the apparatus further comprises an alarm 160 connected in series with the second detection switch; the alarm 160 is used for sending an alarm signal according to the open/close state of the second detection switch.
Specifically, after the photoresistor sensor is illuminated by the light-emitting element in a light-emitting state, the opening and closing states of the detection module are controlled to be changed from a normally open state to a closed state; the second detection switch is changed from a normally open state to a closed state; when the second detection switch is closed, the step-down unit can output a 12V direct current power supply to the alarm 160; the alarm 160 may send an alarm signal to the terminal for alerting the secondary side of the current transformer to an abnormality or failure, e.g., a bushing tap failure; the alarm works only after the photoresistor sensor is illuminated, and the electric energy consumption is low.
In some examples, the second detection switch is a second normally open contact of the detection module; when the second normally open contact is closed, the DC-DC step-down device can output a 12V direct current power supply to the alarm 160; the alarm 160 can send a short message alarm signal to the mobile phone; the alarm 160 may incorporate a SIM (Subscriber Identity Module ) card for 4G (the 4th Generation Mobile Communication Technology, fourth generation mobile communication technology) communication, available for network communication.
In one embodiment, the shielding module 140 is a nickel-plated copper metal polyester fiber cloth.
Specifically, the nickel-copper-plated polyester fiber cloth can be uniformly applied to the inner surface of a terminal box of the current transformer so as to effectively shield electromagnetic interference of high voltage on the primary side of the current transformer and cut off a magnetic link in 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 substrate of the nickel copper plated polyester fiber cloth may be a highly conductive copper layer, with the nickel bonding outer layer having corrosion resistance properties.
In some examples, when the current transformer is overhauled or processed by faults in a preventive manner, if the secondary terminal box cover of the body is required to be opened, the main switch of the power module in the current transformer abnormality monitoring device is firstly closed, so that misoperation of the photosensitive module is avoided, and the atomizing module and the alarm are started by mistake. Because the atomized gas (such as water vapor) does not damage the equipment, when the power failure overhauls, the equipment cannot be damaged even if the secondary side terminal box cover of the current transformer is opened for misoperation.
In some examples, the detection module further includes a third detection switch (e.g., a third normally open contact of the detection module) and a fourth detection switch (e.g., a fourth normally open contact of the detection module); the device further comprises a camera monitoring module connected in series with the third detection switch and a pickup monitoring module connected in series with the fourth detection switch, wherein the camera monitoring module and the pickup monitoring module are both positioned in the terminal box and connected with the power module 150. When the current transformer works normally, the third detection switch and the fourth detection switch are in a normally open state, the camera monitoring module and the pickup monitoring module do not work, and the power consumption is not obviously increased; when the secondary side of the current transformer is abnormal (for example, the ground fault of the bushing end screen), the third detection switch and the fourth detection switch are changed from a normally open state to a closed state, and the camera monitoring module and the pickup monitoring module work and are respectively used for sending video data and sound data in a terminal box to a terminal (for example, a mobile phone).
In one embodiment, as shown in fig. 4, the present application provides a current transformer abnormality monitoring control method based on the above device, including:
s410, controlling the light-emitting state of the light-emitting element according to the secondary side voltage of the current transformer;
s420, controlling the opening and closing states of the detection module according to the light-emitting states of the light-emitting elements; wherein, whether to produce the atomizing gas is determined according to the open-close 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 photoresistor sensor controls the opening and closing states of the detection module according to the luminous states of the luminous elements; the detection module comprises a first detection switch; the atomizer determines whether atomizing gas is generated 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 photoresistor sensor controls the opening and closing states of the detection module according to the luminous states of the light emitting diodes; the micro atomizer determines whether to generate atomized gas according to the opening and closing states of the first normally open contact of the detection module.
It should be understood that, although the steps in the flowchart of fig. 4 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 4 may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor do the order in which the sub-steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of the sub-steps or stages of other steps or other steps.
In one embodiment, the method further comprises the steps of:
and sending an alarm signal according to the opening and closing state of the second detection switch.
Specifically, the detection module further comprises a second detection switch; the alarm sends an alarm signal according to the opening and closing state of the second detection switch;
in some examples, the alarm sends a short message alarm signal to the mobile phone according to the open-close state of the second normally open contact of the detection module.
In one embodiment, the present application provides a current transformer anomaly monitoring control device, comprising: a lighting control module and an atomizing control 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 atomization control module is used for controlling the opening and closing states of the detection module according to the luminous state of the luminous element; wherein, whether to produce the atomizing gas is determined according to the open-close state of the first detection switch.
In one embodiment, the current transformer abnormality monitoring control device further includes an alarm module for sending an alarm signal according to the open/close state of the second detection switch.
The specific limitation of the current transformer abnormality monitoring control device can be referred to the limitation of the current transformer abnormality monitoring control method hereinabove, and will not be described herein. All or part of each module in the current transformer abnormality monitoring control device can be realized by software, hardware and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules. It should be noted that, in the embodiment of the present application, the division of the modules is schematic, which is merely a logic function division, and other division manners may be implemented in actual implementation.
In one embodiment, the application provides a power equipment terminal box, which comprises the current transformer abnormality monitoring device.
In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "ideal embodiments," and the like, means 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 present application. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (10)
1. An anomaly monitoring device for a current transformer, comprising:
the induction module comprises 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;
the photosensitive module is connected with the sensing module; the photosensitive module comprises a photosensitive resistor sensor and a detection module; the photoresistor sensor is used for controlling the opening and closing states of the detection module according to the luminous state of the luminous element; the detection module comprises a first detection switch;
the atomization module is arranged in the terminal box of the current transformer and is connected with the photosensitive module; the atomization module comprises an atomizer connected with the first detection switch in series; the atomizer is used for determining whether atomized gas is generated according to the opening and closing state of the first detection switch;
the shielding module is connected with the induction module; the shielding module is arranged on the inner surface of the terminal box and is used for shielding primary side electromagnetic interference of the current transformer; the shielding module is used for realizing sleeve end screen grounding by contacting the atomized gas inside the terminal box.
2. The current transformer anomaly monitoring device of claim 1, further comprising a power module connected to the induction module, the photosensitive module, and the atomizing module, respectively; the power supply module comprises a voltage reducing unit; the step-down unit is used for providing direct current power supplies with different voltages.
3. The current transformer anomaly monitoring device of claim 2, wherein the power module further comprises 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.
4. The current transformer anomaly monitoring device of claim 2, wherein the sensing module further comprises:
one end of the first switch is connected with the power supply module;
a diode, wherein 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, one end of which is 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 abnormality monitoring device for a current transformer according to claim 4, wherein,
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.
6. The current transformer anomaly monitoring device of any one of claims 1 to 5, wherein the detection module further comprises a second detection switch;
the device also comprises an alarm connected in series with the second detection switch; the alarm is used for sending an alarm signal according to the opening and closing state of the second detection switch.
7. The abnormality monitoring device for a current transformer according to any one of claims 1 to 5, characterized in that,
the shielding module is nickel-copper-plated polyester fiber cloth.
8. A current transformer abnormality monitoring control method based on the apparatus of any one of claims 1 to 7, comprising:
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 states of the detection module according to the light-emitting states of the light-emitting elements; wherein, whether the atomizing gas is generated is determined according to the opening and closing state of the first detection switch.
9. The current transformer anomaly monitoring control method according to claim 8, further comprising the steps of:
and sending an alarm signal according to the opening and closing state of a second detection switch in the detection module.
10. A terminal box for an electric power apparatus, characterized by comprising the abnormality monitoring device for a current transformer according to any one of claims 1 to 7.
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| CN202111393102.0A CN114325541B (en) | 2021-11-23 | 2021-11-23 | Current transformer abnormality monitoring device, control method and power equipment terminal box |
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| CN202111393102.0A CN114325541B (en) | 2021-11-23 | 2021-11-23 | Current transformer abnormality monitoring device, control method and power equipment terminal box |
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| CN104215927A (en) * | 2014-09-02 | 2014-12-17 | 国家电网公司 | Multifunctional mutual inductor tester |
| CN106940415A (en) * | 2017-02-07 | 2017-07-11 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | The detecting system of capacitance sleeve pipe with measurement terminal and end shield ground terminal |
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| CN104215927A (en) * | 2014-09-02 | 2014-12-17 | 国家电网公司 | Multifunctional mutual inductor tester |
| CN106940415A (en) * | 2017-02-07 | 2017-07-11 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | The detecting system of capacitance sleeve pipe with measurement terminal and end shield ground terminal |
| EP3650872A1 (en) * | 2018-11-08 | 2020-05-13 | ABB Schweiz AG | Relative bushing parameter method to avoid temperature influence in transformer absolute bushing parameter monitoring |
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