CN111999549B - Zero line electrification fault warning device - Google Patents
Zero line electrification fault warning device Download PDFInfo
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- CN111999549B CN111999549B CN202010875357.XA CN202010875357A CN111999549B CN 111999549 B CN111999549 B CN 111999549B CN 202010875357 A CN202010875357 A CN 202010875357A CN 111999549 B CN111999549 B CN 111999549B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/145—Indicating the presence of current or voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
Abstract
The application discloses a zero line live fault warning device, which comprises: the input voltage reducing module is used for collecting real-time voltage of the zero line and reducing the real-time voltage to generate reduced-voltage alternating current; the rectification module is connected with the input voltage reduction module and used for converting the voltage reduction alternating current into direct current; and the light-emitting module is connected with the rectifying module and is used for emitting light when the voltage value of the direct current is greater than or equal to a preset light-emitting threshold value. The warning device changes the situation that the fault of the zero line can be found only by depending on the fault report of the user in the long term, converts the original passive fault finding into the active fault finding, and can eliminate the defect actively. And moreover, the warning device is simple in circuit structure, can be permanently installed on the zero line, reflects whether the zero line is electrified in real time, does not need a staff to log on a pole and uses an electroscope for measurement, saves labor, improves efficiency, and simultaneously eliminates the danger of the staff to log on the pole.
Description
Technical Field
The application relates to the technical field of electricity, in particular to a zero line electrified fault warning device.
Background
At present, the problem of live faults of the distribution network zero line has a high incidence rate. The existing large number of public distribution transformer low-voltage areas, wherein a plurality of low-voltage areas, particularly urban village low-voltage areas, have the problems of overlong power supply radius of low-voltage lines, long-term heavy overload operation, incomplete and old confusion of the low-voltage lines and disorder connection of private pull, so that the overhead lines of the low-voltage areas are always electrified in zero line.
The zero line electrification often causes the problems of voltage reduction, voltage fluctuation and the like at the user side, so that the user electricity utilization experience is seriously affected, the safety of daily life electric appliances of the user is seriously threatened, and a large electricity utilization potential safety hazard is formed. The zero line electrification is a daily electricity consumption risk point with high concealment, and is very easy to ignore, so that the occurrence of personnel misoperation electric shock accidents and the damage of user equipment are caused. At present, most of zero line live fault discovery relies on post-fault remedial measures reported by users, and active discovery cannot be achieved through daily inspection, online monitoring and other methods.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a neutral line live fault warning device capable of actively detecting a neutral line live fault without relying on user trouble reporting.
In order to solve the above technical problems, the present application provides a zero line live fault warning device, including:
the input voltage reducing module is used for collecting real-time voltage of the zero line and reducing the real-time voltage to generate reduced-voltage alternating current;
the rectification module is connected with the input voltage reduction module and used for converting the voltage reduction alternating current into direct current;
and the light-emitting module is connected with the rectifying module and is used for emitting light when the voltage value of the direct current is greater than or equal to a preset light-emitting threshold value.
In the zero line live fault warning device in the above embodiment, the input voltage reducing module is configured to collect real-time voltage of the zero line and reduce the real-time voltage to generate reduced-voltage alternating current; the rectifying module is connected with the input voltage reduction module and used for converting the voltage reduction alternating current into direct current; and the light-emitting module is connected with the rectifying module and is used for emitting light when the voltage value of the direct current is greater than or equal to a preset light-emitting threshold value. The warning device changes the situation that the fault of the zero line can be found only by depending on the fault report of the user in the long term, converts the original passive fault finding into the active fault finding, and can eliminate the defect actively. And moreover, the warning device is simple in circuit structure, can be permanently installed on the zero line, intuitively and effectively reflects whether the zero line is electrified in real time, does not need a staff to log on a pole to use an electroscope for measurement, saves labor, improves efficiency, and simultaneously eliminates the danger of the staff to log on the pole.
In one embodiment, the light emitting module includes:
the first port of the resistance adjusting unit is connected with the positive output end of the rectifying module, and the second port of the resistance adjusting unit is connected with the negative output end of the rectifying module;
the control port of the controllable switch unit is connected with the third port of the resistance adjusting unit, the first port of the controllable switch unit is connected with the positive output end of the rectifying module and the first port of the resistance adjusting unit, and the second port of the controllable switch unit is connected with the negative output end of the rectifying module and the second port of the resistance adjusting unit;
the anode of the light-emitting diode is connected with the first port of the resistance adjusting unit and the positive output end of the rectifying module, and the cathode of the light-emitting diode is connected with the first port of the controllable switch unit;
the resistance value of the resistance adjusting unit is changed to change the preset luminous threshold, and when the voltage value of the direct current is larger than or equal to the preset luminous threshold, the controllable switch unit is conducted and communicated with a power supply loop of the light emitting diode so as to light the light emitting diode; and otherwise, the controllable switch unit cuts off a power supply loop of the light emitting diode to emit light so as to enable the light emitting diode to be extinguished.
In the zero line live fault warning device in the above embodiment, the light emitting module includes a resistance adjusting unit, a controllable switch unit and a light emitting diode, a first port of the resistance adjusting unit is connected with a positive output end of the rectifying module, and a second port of the resistance adjusting unit is connected with a negative output end of the rectifying module; the control port of the controllable switch unit is connected with the third port of the resistance adjusting unit, the first port of the controllable switch unit is connected with the positive output end of the rectifying module and the first port of the resistance adjusting unit, and the second port of the controllable switch unit is connected with the negative output end of the rectifying module and the second port of the resistance adjusting unit; the anode of the light emitting diode is connected with the first port of the resistance adjusting unit and the positive output end of the rectifying module, and the cathode of the light emitting diode is connected with the first port of the controllable switch unit. The resistance value of the resistance adjusting unit is changed to change the preset luminous threshold, and when the voltage value of the direct current is larger than or equal to the preset luminous threshold, the controllable switch unit is conducted and communicated with a power supply loop of the light emitting diode so as to light the light emitting diode; on the contrary, the controllable switch unit cuts off the luminous power supply loop of the light-emitting diode, so that the light-emitting diode is extinguished, and a worker can intuitively and effectively judge whether the zero line interface is electrified or not by observing whether the LED lamp emits light or not.
Further, the light emitting module further includes:
and one end of the voltage dividing resistor is connected with the cathode of the light emitting diode, and the other end of the voltage dividing resistor is connected with the first port of the controllable switch unit.
Further, the light emitting module further includes:
the anode of the first zener diode is connected with the control port of the controllable switch unit, and the anode of the first zener diode is connected with the third port of the resistance adjusting unit.
In the zero line live fault warning device in the above embodiment, a voltage dividing resistor is connected in series between the first port of the controllable switch unit and the cathode of the light emitting diode to share a part of voltage, so as to avoid damaging the light emitting diode by excessive voltage; and a first voltage stabilizing diode is connected in series between the third port of the resistance adjusting unit and the control port of the controllable switch unit, when reverse voltage is applied to two ends of the first voltage stabilizing diode, the reverse voltage is larger than breakdown voltage of the first voltage stabilizing diode, and the first voltage stabilizing diode ensures that voltage change at two ends is always in a smaller range, so as to play a role in stabilizing voltage.
Further, the light emitting module further includes:
the first port of the first capacitor is connected with the positive output end of the rectifying module, and the second port of the first capacitor is connected with the negative output end of the rectifying module and is used for filtering and stabilizing the direct current converted by the rectifying module so as to ensure the normal work of the light emitting diode;
the anode of the second zener diode is connected with the negative output end of the rectifying module, the second port of the first capacitor, the second port of the resistance adjusting unit and the second port of the controllable switch unit, and the cathode of the second zener diode is connected with the direct current input port of the rectifying module, the first port of the first capacitor, the first port of the resistance adjusting unit and the anode of the light emitting diode;
the first current limiting resistor, one end of the first current limiting resistor is connected with the first port of the first capacitor and the negative output end of the rectifying module, and the other end of the first current limiting resistor is connected with the cathode of the second zener diode, the first port of the resistance adjusting unit and the anode of the light emitting diode.
In the zero line live fault warning device in the above embodiment, by setting the first capacitor, the second zener diode and the first current limiting resistor, a first port of the first capacitor is connected with the positive output end of the rectifying module, and a second port of the first capacitor is connected with the negative output end of the rectifying module; the anode of the second zener diode is connected with the negative output end of the rectifying module, the second port of the first capacitor, the second port of the resistance adjusting unit and the second port of the controllable switch unit, and the cathode of the second zener diode is connected with the direct current input port of the rectifying module, the first port of the first capacitor, the first port of the resistance adjusting unit and the anode of the light emitting diode; one end of the first current limiting resistor is connected with the first port of the first capacitor and the negative output end of the rectifying module, the other end of the first current limiting resistor is connected with the cathode of the second zener diode, the first port of the resistance adjusting unit and the anode of the light emitting diode, and the first port, the first port of the resistance adjusting unit and the anode of the light emitting diode are matched with each other to filter and stabilize direct current converted by the rectifying module.
In one embodiment, the input buck module includes:
the first input port of the filter inductor is connected with the zero line, the second input port of the filter inductor is grounded, the first output port of the filter inductor is connected with the first alternating current input port of the rectifying module, and the second output port of the filter inductor is connected with the second alternating current input port of the rectifying module and is used for reducing the real-time voltage and performing first filtering treatment to generate a filtered real-time voltage;
and the filtering unit is connected with the first output port of the filtering inductor and the first alternating current input port of the rectifying module and is used for carrying out second filtering processing on the filtering real-time voltage so as to generate the step-down alternating current.
Further, the filtering unit includes: the second current limiting resistor is connected with the second capacitor in parallel, the second current limiting resistor and the second capacitor form an RC filter circuit, when larger pulsating current passes through the filter unit, the second capacitor charges faster, voltage fluctuation at two ends is larger, and the second current limiting resistor is connected in parallel, so that the charging speed of the second capacitor is reduced, and the voltage at two ends of the second capacitor is gentle.
In one embodiment, the method further comprises:
the input end of the overvoltage protection module is connected with the zero line and the input voltage reduction module, and the output end of the overvoltage protection module is grounded and connected with the input voltage reduction module, so that when the real-time voltage of the zero line exceeds the upper limit value of the bearing voltage of the warning device, the real-time voltage is introduced into the ground.
Further, the overvoltage protection module comprises a high-pressure gas discharge tube.
Still further, the high-pressure gas discharge tube includes:
the cathode of the diode is connected with the zero line and the input voltage reduction module;
and the anode of the third zener diode is connected with the anode of the diode, and the cathode of the third zener diode is connected with the input voltage dropping module and grounded.
In the zero line live fault warning device in the above embodiment, by setting the diode and the third zener diode, the cathode of the diode is connected with the zero line and the input voltage reduction module, the anode of the third zener diode is connected with the anode of the diode, the cathode of the third zener diode is connected with the input voltage reduction module and grounded, when the live voltage of the zero line is greater than the reverse breakdown voltage of the diode, the excessive real-time voltage is introduced into the ground through the diode and the third zener diode, so that the zero line live voltage is prevented from entering the input voltage reduction module and damaging other components of the device.
The foregoing description is only an overview of the present application, and is intended to provide a better understanding of the present application, as it is embodied in the following description, with reference to the preferred embodiments of the present application and the accompanying drawings.
Drawings
For a better description and illustration of embodiments and/or examples of those applications disclosed herein, reference may be made to one or more of the accompanying drawings. Additional details or examples used to describe the drawings should not be construed as limiting the scope of the disclosed application, the presently described embodiments and/or examples, and any of the presently understood modes of carrying out the application.
Fig. 1 is a schematic circuit diagram of a zero line live fault warning device according to a first embodiment of the present application;
fig. 2 is a schematic circuit diagram of a zero line live fault warning device according to a second embodiment of the present application;
fig. 3 is a schematic circuit diagram of a zero line live fault warning device according to a third embodiment of the present application;
fig. 4 is a schematic circuit diagram of a zero line live fault warning device according to a fourth embodiment of the present application;
fig. 5 is a schematic circuit diagram of a zero line live fault warning device according to a fifth embodiment of the present application;
fig. 6 is a schematic circuit diagram of a zero line live fault warning device according to a sixth embodiment of the present application;
fig. 7 is a schematic circuit diagram of a zero line live fault warning device according to a seventh embodiment of the present application;
fig. 8 is a schematic circuit diagram of a zero line live fault warning device according to an eighth embodiment of the present application.
Reference numerals illustrate: 10-input voltage reduction module, 20-rectifying module, 30-light emitting module, 301-resistance adjusting unit, 302-controllable switch unit, 40-overvoltage protection module, and filtering unit 101.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Detailed embodiments of the application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
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 in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
In order to illustrate the above technical solution of the present application, the following description will be made by specific examples.
In one embodiment of the present application, as shown in fig. 1, a zero line live fault warning device includes: the input voltage step-down module 10, the rectifying module 20, and the light emitting module 30. The input voltage reduction module 10 is used for collecting real-time voltage of the zero line and reducing the real-time voltage to generate reduced-voltage alternating current; the rectifying module 20 is connected with the input voltage reducing module 10 and is used for converting the voltage-reduced alternating current into direct current; the light emitting module 30 is connected to the rectifying module 20, and is configured to emit light when a voltage value of the direct current is greater than or equal to a preset light emitting threshold.
In one embodiment, the specific circuit structure of the rectifying module 20 is not limited herein, as long as it can convert ac power into dc power.
In the zero line live fault warning device in the above embodiment, the input voltage reducing module is configured to collect real-time voltage of the zero line and reduce the real-time voltage to generate reduced-voltage alternating current; the rectifying module is connected with the input voltage reduction module and used for converting the voltage reduction alternating current into direct current; and the light-emitting module is connected with the rectifying module and is used for emitting light when the voltage value of the direct current is greater than or equal to a preset light-emitting threshold value. The warning device changes the situation that the fault of the zero line can be found only by depending on the fault report of the user in the long term, converts the original passive fault finding into the active fault finding, and can eliminate the defect actively. And moreover, the warning device is simple in circuit structure, can be permanently installed on the zero line, intuitively and effectively reflects whether the zero line is electrified in real time, does not need a staff to log on a pole to use an electroscope for measurement, saves labor, improves efficiency, and simultaneously eliminates the danger of the staff to log on the pole.
In one embodiment of the present application, as shown in fig. 2, a zero line live fault warning device is provided, and a light emitting module 30 includes: a resistance adjustment unit 301, a controllable switching unit 302 and a light emitting diode LED. A first port of the resistance adjusting unit 301 is connected with a positive output end of the rectifying module 20, and a second port of the resistance adjusting unit 301 is connected with a negative output end of the rectifying module 20; the control port of the controllable switch unit 302 is connected with the third port of the resistance adjusting unit 301, the first port of the controllable switch unit 302 is connected with the positive output end of the rectifying module 20 and the first port of the resistance adjusting unit 301, and the second port of the controllable switch unit 302 is connected with the negative output end of the rectifying module 20 and the second port of the resistance adjusting unit 301; the anode of the light emitting diode LED is connected with the first port of the resistance adjusting unit 301 and the positive output end of the rectifying module 20, and the cathode of the light emitting diode LED is connected with the first port of the controllable switch unit 302; wherein, the preset lighting threshold is changed by changing the resistance value of the resistance adjusting unit 301, and when the voltage value of the direct current is greater than or equal to the preset lighting threshold, the controllable switch unit 302 is turned on and communicated with the power supply loop of the light emitting diode LED to light the light emitting diode LED; on the contrary, the controllable switch unit 302 turns off the power supply loop for the light emitting diode LED to turn off the light emitting diode LED, so that a worker can intuitively and effectively judge whether the zero line interface is electrified by observing whether the LED lamp emits light.
Specifically, the resistance adjusting unit 301 includes, but is not limited to, an adjustable resistance device such as a varistor, and changes the resistance value by changing the length of a resistance wire connected to a circuit portion, thereby changing the magnitude of current in the circuit. The controllable switch unit 302 includes, but is not limited to, a transistor, an IGBT transistor, a MOSFET transistor, or a controllable switch transistor such as a thyristor.
In one embodiment, the neutral-line live fault warning device may be used in a huge number of public distribution low-voltage areas, especially in a village low-voltage area in a city, and the resistance value of the resistance adjustment unit 301 may be adjusted in advance according to the parameter setting. For example, setting the input voltage to be 10V enables the light emitting diode LED to emit light, and once the input voltage exceeds 10V, the LED emits light, and as the input voltage increases, the brightness of the LED emits light also increases. Specifically, the voltage between the zero line and ground is the input voltage.
In one embodiment of the present application, as shown in fig. 3, the light emitting module 30 further includes a voltage dividing resistor R1, one end of the voltage dividing resistor R1 is connected to the cathode of the light emitting diode LED, the other end of the voltage dividing resistor R1 is connected to the first port of the controllable switch unit 302, and the voltage dividing resistor R1 shares a part of the voltage to avoid the light emitting diode LED from being damaged by the excessive voltage.
In one embodiment, as shown in fig. 3, the light emitting module 30 further includes a first zener diode D1, an anode of the first zener diode D1 is connected to the control port of the controllable switch unit 302, and an anode of the first zener diode D1 is connected to the third port of the resistance adjustment unit 301. When the control end of the resistance adjustment unit 301 moves to the second port of the resistance adjustment unit 301, the controllable switch unit 302 will be caused to be shorted, and the first zener diode D1 is connected between the resistance adjustment unit 301 and the controllable switch unit 302, so that the situation can be avoided, and the controllable switch unit 302 is effectively protected.
In one embodiment of the present application, as shown in fig. 4, a zero line live fault warning device is provided, and the light emitting module 30 further includes: a first capacitor C1, a second zener diode D2 and a first current limiting resistor R2. The first port of the first capacitor C1 is connected with the positive output end of the rectifying module 20, and the second port of the first capacitor C1 is connected with the negative output end of the rectifying module 20 and used for filtering and stabilizing the direct current converted by the rectifying module 20 and ensuring the normal work of the light emitting diode LED. The anode of the second zener diode D2 is connected with the negative output end of the rectifying module 20, the second port of the first capacitor C1, the second port of the resistance adjusting unit 301 and the second port of the controllable switch unit 302, and the cathode of the second zener diode D2 is connected with the direct current input port of the rectifying module 20, the first port of the first capacitor C1, the first port of the resistance adjusting unit 301 and the anode of the light emitting diode LED; one end of the first current limiting resistor R1 is connected with the first port of the first capacitor C1 and the negative output end of the rectifying module 20, the other end of the first current limiting resistor R1 is connected with the cathode of the second zener diode D2, the first port of the resistance adjusting unit 301 and the anode of the light emitting diode LED, and the first capacitor C1, the second zener diode D2 and the first current limiting resistor R2 are matched with each other to filter and stabilize direct current converted by the rectifying module.
In one embodiment of the present application, as shown in fig. 5, an apparatus for warning zero line live fault is provided, and the input voltage step-down module 10 includes: a filter inductance L and a filter unit 101. The first input port of the filter inductor L is connected with the zero line, the second input port of the filter inductor L is grounded, the first output port of the filter inductor L is connected with the first alternating current input port of the rectifying module 20, and the second output port of the filter inductor L is connected with the second alternating current input port of the rectifying module 20 and is used for reducing the real-time voltage and performing first filtering treatment to generate the filtered real-time voltage. The filtering unit 101 is connected to the first output port of the filtering inductor L and the first ac input port of the rectifying module 20, and is configured to perform a second filtering process on the filtered real-time voltage to generate a step-down ac, so that the output step-down ac becomes gentle and stable.
In one embodiment of the present application, as shown in fig. 6, a zero line live fault warning device is provided, and the filtering unit 10 includes: the second current limiting resistor R3 and the second capacitor C2 are connected in parallel, the second current limiting resistor R3 and the second capacitor C2 form an RC filter circuit, when larger pulsating current passes through the filter unit 101, the second capacitor C2 charges faster, voltage fluctuation at two ends is larger, and the second current limiting resistor R3 is connected in parallel, so that the charging speed of the second capacitor C2 is slowed down, and the voltage at two ends of the second capacitor C2 is gentle.
In one embodiment of the present application, as shown in fig. 6, the input buck module 10 further includes a third current limiting resistor R4 and a fourth current limiting resistor R5. One end of the third current limiting resistor R4 is connected with the first output port of the filter inductor L, the other end of the third current limiting resistor R4 is connected with the filter unit 101, one end of the fourth current limiting resistor R4 is connected with the second output port of the filter inductor L, and the other end of the fourth current limiting resistor R4 is connected with the second ac input port of the rectifying module 20. The third current limiting resistor R4 is connected in series with the filtering unit 101 and is used as a load resistor to bear a part of filtering real-time voltage reduced by the self-filtering inductor L, so that the second capacitor C2 is continuously circulated through load discharge and is matched with the filtering unit 101 for use, and a better filtering effect can be achieved.
In one embodiment of the present application, as shown in fig. 7, a zero line live fault warning device further includes: the input end of the overvoltage protection module 40 is connected with the zero line and the input voltage reduction module 10, and the output end of the overvoltage protection module 40 is grounded and connected with the input voltage reduction module 10, so that when the real-time voltage of the zero line exceeds the upper limit value of the bearing voltage of the warning device, the real-time voltage is introduced into the ground.
Specifically, as shown in fig. 8, the overvoltage protection module 40 includes a high-pressure gas discharge tube including: a diode D4 and a third zener diode D3. The cathode of the diode D4 is connected with the zero line and the input voltage reduction module 10; and when the zero line charged voltage is greater than the reverse breakdown voltage of the diode, the excessive real-time voltage is introduced into the ground through the diode and the third zener diode, so that the excessive real-time voltage is prevented from entering the input voltage reducing module and damaging other components of the device.
In one embodiment, as shown in FIG. 8, PAD1 and PAD2 are heat dissipation PADs for large area copper-clad heat dissipation. The PAD1 is connected with the zero line, the PAD2 is Grounded (GND), and the whole warning device is permanently fixed on the zero line through welding of the PAD1 and the PAD2 so as to reflect whether the zero line is electrified in real time, so that an operator is not required to log on a pole and use an electroscope for measurement, manpower and material resources are saved, and the potential danger of the operator for logging on the pole is effectively eliminated.
In the zero line live fault warning device in the above embodiment, by setting the diode and the third zener diode, the cathode of the diode is connected with the zero line and the input voltage reduction module, the anode of the third zener diode is connected with the anode of the diode, the cathode of the third zener diode is connected with the input voltage reduction module and grounded, when the live voltage of the zero line is greater than the reverse breakdown voltage of the diode, the excessive real-time voltage is introduced into the ground through the diode and the third zener diode, so that the zero line live voltage is prevented from entering the input voltage reduction module and damaging other components of the device.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described 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 illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (8)
1. A zero line live fault warning device, comprising:
the input voltage reducing module is used for collecting real-time voltage of the zero line and reducing the real-time voltage to generate reduced-voltage alternating current;
the rectification module is connected with the input voltage reduction module and used for converting the voltage reduction alternating current into direct current;
the light-emitting module is connected with the rectifying module and is used for emitting light when the voltage value of the direct current is greater than or equal to a preset light-emitting threshold value;
wherein, the light emitting module includes:
the first port of the resistance adjusting unit is connected with the positive output end of the rectifying module, and the second port of the resistance adjusting unit is connected with the negative output end of the rectifying module;
the control port of the controllable switch unit is connected with the third port of the resistance adjusting unit, the first port of the controllable switch unit is connected with the positive output end of the rectifying module and the first port of the resistance adjusting unit, and the second port of the controllable switch unit is connected with the negative output end of the rectifying module and the second port of the resistance adjusting unit;
the anode of the light-emitting diode is connected with the first port of the resistance adjusting unit and the positive output end of the rectifying module, and the cathode of the light-emitting diode is connected with the first port of the controllable switch unit;
the resistance value of the resistance adjusting unit is changed to change the preset luminous threshold, and when the voltage value of the direct current is larger than or equal to the preset luminous threshold, the controllable switch unit is conducted and communicated with a power supply loop of the light emitting diode so as to light the light emitting diode; otherwise, the controllable switch unit cuts off a power supply loop of the light emitting diode to emit light so as to enable the light emitting diode to be extinguished; wherein, the input step-down module includes:
the first input port of the filter inductor is connected with the zero line, the second input port of the filter inductor is grounded, the first output port of the filter inductor is connected with the first alternating current input port of the rectifying module, the second output port of the filter inductor is connected with the second alternating current input port of the rectifying module, and the filter inductor is used for reducing the real-time voltage and performing first filtering treatment to generate a filtered real-time voltage;
the filtering unit is connected in series between the first output port of the filtering inductor and the first alternating current input port of the rectifying module and is used for carrying out second filtering processing on the filtering real-time voltage so as to generate the step-down alternating current.
2. The neutral-wire live fault warning device of claim 1, wherein the light module further comprises:
and one end of the voltage dividing resistor is connected with the cathode of the light emitting diode, and the other end of the voltage dividing resistor is connected with the first port of the controllable switch unit.
3. The neutral-wire live fault warning device of claim 2, wherein the light module further comprises:
the anode of the first zener diode is connected with the control port of the controllable switch unit, and the anode of the first zener diode is connected with the third port of the resistance adjusting unit.
4. The neutral-wire live fault warning device of claim 2, wherein the light module further comprises:
the first port of the first capacitor is connected with the positive output end of the rectifying module, and the second port of the first capacitor is connected with the negative output end of the rectifying module;
the anode of the second zener diode is connected with the negative output end of the rectifying module, the second port of the first capacitor, the second port of the resistance adjusting unit and the second port of the controllable switch unit, and the cathode of the second zener diode is connected with the direct current input port of the rectifying module, the first port of the first capacitor, the first port of the resistance adjusting unit and the anode of the light emitting diode;
the first current limiting resistor, one end of the first current limiting resistor is connected with the first port of the first capacitor and the negative output end of the rectifying module, and the other end of the first current limiting resistor is connected with the cathode of the second zener diode, the first port of the resistance adjusting unit and the anode of the light emitting diode.
5. The neutral-wire live fault warning device of claim 4, wherein the filtering unit comprises: the second current limiting resistor is connected with the second capacitor in parallel.
6. The neutral-wire live fault warning device according to any one of claims 1 to 5, further comprising:
the input end of the overvoltage protection module is connected with the zero line and the input voltage reduction module, and the output end of the overvoltage protection module is grounded and connected with the input voltage reduction module, so that when the real-time voltage of the zero line exceeds the upper limit value of the bearing voltage of the warning device, the real-time voltage is introduced into the ground.
7. The neutral-wire live fault warning device of claim 6, wherein the overvoltage protection module comprises a high-pressure gas discharge tube.
8. The neutral-line live fault warning device of claim 7, wherein the high-pressure gas discharge tube comprises:
the cathode of the diode is connected with the zero line and the input voltage reduction module;
and the anode of the third zener diode is connected with the anode of the diode, and the cathode of the third zener diode is connected with the input voltage dropping module and grounded.
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