CN114325543B - Current transformer abnormality monitoring device and control method - Google Patents
Current transformer abnormality monitoring device and control method Download PDFInfo
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Abstract
The application relates to an abnormality monitoring device and a control method for a current transformer. The control method comprises the following steps: 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 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 strip of the protection measurement and control cabinet and is used for sending out abnormal signals of the current transformer according to the opening and closing state of the first detection switch. The secondary side open circuit fault that this application can induce current transformer in time sends current transformer abnormal signal, avoids the staff to get an electric shock because of touching the overvoltage when checking the circuit to improve the security.
Description
Technical Field
The application relates to the technical field of transformer monitoring, in particular to a current transformer abnormality monitoring device and a control method.
Background
The current transformer is an important component device in the power system and provides metering, measuring and protecting functions for safe operation of the power. Once the current transformer fails, the relay protection device can malfunction seriously, so that the breaker trips, power supply is interrupted, and production safety is compromised. When the current transformer works normally, the voltage of the secondary side is extremely low; when the secondary side of the current transformer is open-circuited, on one hand, abnormal overvoltage is generated, the insulation strength of the secondary side is damaged, and then insulation burning loss of the secondary side of the equipment is caused; on the other hand, the iron core of the current transformer is saturated rapidly, and irreversible damage can be caused to the inside of the equipment.
At present, when the current transformer is checked to be abnormal, if the load of the 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 open circuit fault of the secondary side of the current transformer is difficult to identify; if the operator on duty directly checks the current transformer terminal strip of the cabinet behind the nearby control room protection measurement and control panel, for example, check whether the terminal strip is loose in wiring and connecting piece is loose, at this time, the operator is most likely to get an electric shock due to contact with overvoltage.
In the implementation process, the inventor finds that at least the following problems exist in the conventional technology:
the current transformer abnormality 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 desirable to provide a current transformer abnormality monitoring device and a control method that can improve safety.
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 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 strip of the protection measurement and control cabinet and is used for sending out abnormal signals of the current transformer according to the opening and closing state of the first detection switch.
In one embodiment, the detection module further includes a second detection switch; the apparatus further comprises:
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 second detection switch; the atomizer is used for determining whether atomizing gas is generated according to the opening and closing state of the second detection switch.
In one embodiment, the method further comprises:
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 eliminating overvoltage by contacting atomized gas inside 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;
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 detection module further includes a third detection switch;
the alarm module further 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 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, send the unusual signal of current transformer according to the on-off state of first detection switch.
In one embodiment, the method further comprises the steps of:
whether or not the atomizing gas is generated is determined based on the open/close state of the second detection switch.
In one embodiment, the method further comprises the steps of:
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 abnormality monitoring device, 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 connection mode and is not in direct contact, so that the current transformer abnormality monitoring device is convenient to install and does not influence the safe operation of the equipment; the secondary side of the current transformer can be induced to open a circuit fault and timely send out an abnormal signal of the current transformer, so that workers are reminded of the open circuit fault of the secondary side of the current transformer, and electric shock caused by contact with overvoltage when the workers check a circuit is avoided, so that the safety in the operation process 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 an equivalent circuit schematic diagram of a current transformer in one example;
FIG. 2 is a non-sinusoidal plot of current transformer secondary open circuit voltage versus core flux variation in one example;
FIG. 3 is a block diagram of an abnormality monitoring device for a current transformer in one embodiment;
FIG. 4 is a block diagram of an abnormality monitoring device for a current transformer according to another embodiment;
FIG. 5 is a schematic circuit diagram of an induction module in one embodiment;
fig. 6 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.
In the equivalent circuit schematic diagram of the current transformer, as shown in fig. 1, the secondary impedance is Z 2 ＝X S +R S +Z b The method comprises the steps of carrying out a first treatment on the surface of the Wherein X is S For secondary winding reactance, R S For secondary winding resistance, Z b Is the load impedance; current error of x=i e /(I e +I S ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein I is e For exciting current, I S Is the secondary current.
During normal operation, the secondary side of the current transformer is short-circuited, Z b Far less than the excitation reactance Z e ，I S Far greater than I e Through Z e Is the current I of (2) e The secondary side loop of the transformer generates a certain current error X. At this time, the secondary side voltage U 2 ＝[(1-X)I P /K]Z b Wherein K is a transformation ratio, I P Is the primary current.
When the current transformer is secondarily opened, the external load loop is opened, and the secondary side voltage U is obtained 2 ＝(I P /K)Z e . Due to I P /K＝(I e +I S ) I when the secondary side is open S ＝0，I P /K＝I e The secondary induced current is all converted into exciting current. Due to Z e Far greater thanZ near short circuit during normal operation b While in normal operation, the current error X is extremely small, (1-X) I P Sum of K and I P The difference of K is not large, so (I P /K)Z e Far greater than [ (1-X) I P /K]Z b 。
When the secondary induction current is completely converted into exciting current, magnetomotive force is increased, the magnetic flux of the iron core is saturated rapidly, and when the magnetic flux of the iron core reaches the limit, the exciting impedance Z e Minimum, that is, after the magnetic flux of the iron core of the current transformer is saturated, the secondary side voltage U in the open circuit state 2 ＝(I P /K)Z e Can be rapidly reduced and repeated in this way; as shown in fig. 2, the secondary open circuit voltage is u, the magnetic induction intensity of the iron core is B, the magnetic field intensity of the iron core is H, and the time is t.
Further, the current transformer is opened at the secondary side, so that the circuit is interfered or the equipment is in misoperation, and a large amount of electric energy is lost; the heavy accident of electric shock of the operator is caused. Specifically, after the secondary side of the current transformer is opened, overvoltage is generated in the terminal box of the secondary side, and meanwhile, the overvoltage can reach the terminal strip of the current transformer along the secondary side wiring loop of the current transformer. The current transformer terminal row department has the short link (after the short link is used for the screwdriver to loosen the link screw, the disconnection that slides to the left, and the short circuit that slides to the right conveniently overhauls the test), if the person on duty discovers that monitoring current disappears or the kilowatt-hour meter increases to be 0, often can inspect earlier the current transformer terminal row of cabinet behind the control room protection measurement and control panel that is closest, whether the wiring is not hard up and the link is not hard up takes place, and is the easiest electric shock because of touching overvoltage this moment. In view of the situation, the application provides a current transformer abnormality monitoring device and a control method, which can improve the safety of a current transformer after an open circuit occurs on the secondary side.
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. 3, 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 alarm module 130 is connected with the photosensitive module 120; the alarm module 130 includes a signal element in series with the first detection switch; the signal element is arranged at the terminal strip of the protection measurement and control cabinet and is used for sending out abnormal signals 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 an operator on duty to monitor the disappearance of the system current because the secondary side of the current transformer is open-circuited, and the secondary wiring is already provided with overvoltage and does not touch the checking wiring;
in some examples, the signal element may send out an abnormal signal of the current transformer in a light emitting manner, for example, send out red flash after being turned on by a red flash diode, so as to indicate that the current transformer is abnormal;
in one embodiment, the detection module further includes a second detection switch; as shown in fig. 4, the apparatus further includes:
the atomization module 140 is arranged in the terminal box and connected with the photosensitive module 120; the atomizing module 140 includes an atomizer in series with a second detection switch; the atomizer is used for determining whether atomizing gas is generated according to the opening and closing 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; the atomizer may 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 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 second detection switch is a second normally open contact of the detection module; the liquid may be water, for example, tap water; the volume of liquid may be 100mL.
In one embodiment, as shown in fig. 4, further includes:
a shielding module 150 connected with the sensing module 110; the shielding module 150 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 150 is used to achieve overvoltage elimination 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 150 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 terminal box shells of the current transformers are also connected with the ground network, and the shielding modules 150 are in contact with the atomized gas in the terminal box through the contact of the terminal box, so that all secondary terminal binding posts of the open-circuit current transformers are in contact with the shielding modules 150 arranged on the inner surfaces of the terminal box shells; the shielding module 150 has conductivity to realize that the secondary terminal binding posts of the current transformer are mutually short-circuited and grounded, which is equivalent to the multipoint grounding of the secondary side of the current transformer, so that the overvoltage of the secondary side 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 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 150 makes all the secondary side terminal binding posts of the open-circuit current transformer contact nickel-plated copper metal on the polyester fiber cloth on the inner surface of the terminal box shell through the atomized gas contacting the inside of the terminal box; the nickel-plated copper metal has conductivity 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 being connected with a power supply;
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 dc power supply forms a loop with the field effect transistor via 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 detection module further includes 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 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 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 of abnormality or fault of the secondary side of the current transformer, for example, open circuit fault of the secondary side 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 can be built with a SIM (Subscriber Identity Module ) card for 4G (the 4th Generation Mobile Communication Technology, fourth generation mobile communication technology) communication, which can 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 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 shielding module 150 is a nickel-plated copper metal polyester fiber cloth.
Specifically, the nickel-copper metal 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 one embodiment, the power supply may provide dc power with different voltages to the sensing module 110, the photosensitive module 120, the alarm module 130, and the atomizing module 140 through the voltage reduction unit, respectively;
in some examples, the buck unit may be a DC-DC buck; the DC-DC step-down device can output 12V, 5V and 3V DC power respectively, wherein the DC-DC step-down device can output 5V DC power to the photosensitive module 120; the DC-DC step-down converter may output a 3V direct current power to the sensing module 110; the DC-DC step-down converter can output 12V direct current power to the alarm module 130 and the atomization module 140 respectively; 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, and the alarm module and the atomization module only work after the photoresistor sensor is illuminated, so that the power 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 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 photosensitive module 120, the sensing module 110, the alarm module 130 and the atomization module 140 through a DC-DC voltage reducer; the lithium battery pack may be a 18650 lithium battery pack; the rated voltage of the lithium battery pack may be 12V; 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, 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 power switch 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 module 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 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 that establishes ties with fourth detection switch to and the pickup monitoring module that establishes ties with fifth detection switch, the inside that all is located the terminal box with pickup monitoring module and is connected with the power. When the current transformer works normally, the fourth detection switch and the fifth 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 an abnormality (e.g., a last screen ground fault) occurs on the secondary side of the current transformer, the fourth detection switch and the fifth detection switch are changed from a normally open state to a closed state, and the camera monitoring module and the pickup monitoring module operate to respectively transmit video data and sound data in a terminal box to a terminal (e.g., 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 device, 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 states of the detection module according to the light-emitting states of the light-emitting elements; wherein, send the unusual signal of current transformer according to the on-off state of 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 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 photoresistor sensor controls the opening and closing states of the detection module according to the luminous states of the light emitting diodes; the red flash diode emits red flash according to the opening and closing state of the first normally open contact of the detection module so as 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 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. 6 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:
whether or not the atomizing gas is generated is determined based on the open/close state of the second detection switch.
Specifically, the detection module further comprises a second detection switch; the atomizer determines whether to generate atomized gas according to the opening and closing state of the second detection switch;
in some examples, the micro-nebulizer determines whether to generate nebulizing gas based on the open/closed state of the second normally open contact of the detection module.
In one embodiment, the method further comprises the steps of:
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 opening and closing state of the third 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 third normally open contact of the detection module.
In one embodiment, the present application provides a current transformer anomaly monitoring control device, comprising: the device comprises a light-emitting control module and an abnormality 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 abnormality alarm module is used for controlling the opening and closing states of the detection module according to the luminous states of the luminous elements; wherein, be used for sending current transformer abnormal signal according to the open-close state of first detection switch.
In one embodiment, the current transformer abnormality monitoring control device further includes an atomization control module for determining whether to generate an atomization gas according to an open/close 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 an open/close state of the third 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 method, and the description thereof is omitted 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 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 (8)
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 and a second 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 is used for sending out an abnormal signal of the current transformer according to the opening and closing state of the 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 with the second detection switch in series; the atomizer is used for determining whether atomized gas is generated according to the opening and closing state of the second detection switch;
the shielding module is connected with the induction 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 eliminating overvoltage by contacting the atomized gas inside the terminal box.
2. The current transformer anomaly monitoring device of claim 1, wherein the sensing module further comprises:
one end of the first switch is used for being connected with a power supply;
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.
3. The current transformer anomaly monitoring device of claim 1, wherein the detection module further comprises a third detection switch;
the alarm module further 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.
4. The abnormality monitoring device for a current transformer according to claim 2, 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.
5. The abnormality monitoring device for a current transformer according to claim 1, wherein,
the shielding module is nickel-copper-plated polyester fiber cloth.
6. A current transformer abnormality monitoring control method based on the apparatus of any one of claims 1 to 5, 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; and sending out an abnormal signal of the current transformer according to the opening and closing state of the first detection switch.
7. The current transformer anomaly monitoring control method according to claim 6, further comprising the steps of:
and determining whether the atomized gas is generated according to the opening and closing state of the second detection switch.
8. The anomaly monitoring control method of current transformer according to claim 6, wherein the detection module further comprises a third detection switch; the method further comprises the steps of:
and sending an alarm signal to a terminal according to the opening and closing state of the third detection switch.
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