High-voltage line potential indicator

Abstract

The invention discloses a high-voltage line potential indicator, which comprises an indicator shell, a pressure spring, a spherical lampshade with a luminescent tube inside, and a coupling voltage circuit, an induced current circuit, a power supply circuit, a board turning indication module and a microprocessor which are positioned in the indicator shell, the microprocessor is configured to acquire a voltage signal from the coupling voltage circuit and acquire a current signal from the induction current circuit; according to the relationship among the voltage signal, the current signal and the corresponding preset threshold value, whether the detected line is electrified is judged; and if the detected circuit is judged to be electrified, the board turning indication module is driven to enable the light-emitting tube to emit light. Charged state identification is carried out through two criteria of the electric field and the current, and the stability and the accuracy of a high-voltage line charged indication function can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of electric power detection, and in particular to a high-voltage line live indicator. Background Art

[0002] Due to the height and high voltage of high-voltage overhead transmission lines, it is impossible to directly determine whether they are energized, which poses a safety hazard. Energized indication technology can help maintenance personnel intuitively identify whether the line is energized and avoid accidents caused by accidentally touching the high-voltage line, which is crucial to maintenance safety. High-voltage line energized indication technology usually uses electromagnetic induction, capacitive induction or other electromagnetic principles to determine whether the high-voltage line is energized by detecting electric field strength or electromagnetic radiation. However, the current high-voltage line energized indication technology still has some bottlenecks in some specific environments, and its stability and accuracy need to be improved. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a high-voltage line live indicator, which identifies the live state through two criteria, electric field and current, and can improve the stability and accuracy of the high-voltage line live indication function.

[0004] An embodiment of the present invention provides a high-voltage line live indicator, comprising:

[0005] An indicator housing, a compression spring, a spherical lampshade containing a light-emitting tube, and a coupling voltage circuit, an induction current circuit, a power supply circuit, a card flipping indication module and a microprocessor located inside the indicator housing;

[0006] The microprocessor is configured to obtain a voltage signal from the coupling voltage circuit and a current signal from the induced current circuit; determine whether the measured circuit is energized based on the relationship between the voltage signal, the current signal and the corresponding preset threshold value; if it is determined that the measured circuit is energized, drive the flip indicator module to make the light-emitting tube emit light.

[0007] Further, judging whether the measured line is energized according to the relationship between the voltage signal, the current signal and the corresponding preset threshold value includes:

[0008] When there are the voltage signal and the current signal, if the voltage signal is greater than a first voltage threshold and the current signal is greater than a first current threshold, it is determined that the measured circuit is energized, otherwise it is determined that the measured circuit is not energized;

[0009] When there is the voltage signal and there is no current signal, if the voltage signal is greater than a second voltage threshold, it is determined that the tested circuit is energized, otherwise it is determined that the tested circuit is not energized;

[0010] When there is the current signal and there is no voltage signal, if the current signal is greater than the second current threshold, it is determined that the measured circuit is energized, otherwise it is determined that the measured circuit is not energized;

[0011] When there is no voltage signal and no current signal, it is determined that the measured circuit is not energized.

[0012] Furthermore, the first voltage threshold is smaller than the second voltage threshold, and the first current threshold is smaller than the second current threshold.

[0013] Furthermore, the microprocessor is also configured to:

[0014] The preset threshold is dynamically adjusted according to the fluctuation amplitude of the voltage signal within a preset time.

[0015] Furthermore, dynamically adjusting the preset threshold value according to the fluctuation amplitude of the voltage signal within a preset time includes:

[0016] Recording historical voltage signals within a preset historical time period, and obtaining the fluctuation amplitude of the voltage signals within the historical time period;

[0017] Determining whether the fluctuation amplitude is greater than a preset fluctuation threshold;

[0018] If yes, increasing the preset threshold corresponding to the voltage signal;

[0019] If not, the original preset threshold is maintained.

[0020] Furthermore, the coupling voltage circuit includes: a discharge tube, and a resonant circuit composed of a resistor, an inductor, and a capacitor;

[0021] The coupling voltage circuit is connected to the compression spring, and the compression spring is hung on the single end of the tested line when performing line detection; the compression spring serves as an induction coil, and obtains the voltage signal after coupling the electric field.

[0022] Furthermore, the induction current circuit includes a signal sampling circuit and a signal amplification circuit;

[0023] The signal sampling circuit obtains a current sampling signal by coupling the magnetic field of the measured circuit through a built-in current transformer; the current sampling signal passes through the signal amplification circuit to obtain the current signal.

[0024] Furthermore, the power supply circuit includes a power sampling circuit, a rectification filtering and level conversion circuit, a lithium battery power supply circuit and an energy discharge circuit;

[0025] The power sampling circuit uses the magnetic saturation characteristics of the current transformer to obtain an AC voltage; the AC voltage is passed through the rectification, filtering and level conversion circuit to obtain a DC voltage to charge the lithium battery; the lithium battery power supply circuit is used to provide working power for the charged indicator.

[0026] Furthermore, the card flipping indication module includes a card flipping driving circuit and a card flipping indication circuit;

[0027] The card flipping driving circuit is used to drive the light-emitting tube in the card flipping indicating circuit to emit light and flash for display by adopting PWM pulse output mode when the tested circuit is energized.

[0028] Furthermore, a positioning foot is provided on the upper portion of the indicator housing, and the compression spring is hinged to the positioning foot.

[0029] Compared with the prior art, the beneficial effects of a high-voltage line live indicator provided by an embodiment of the present invention are: by utilizing the electric field coupling method to obtain the electric field strength (i.e., voltage signal) around the high-voltage line as the main criterion for the live state, and by utilizing the magnetic field coupling method to obtain the current state in the line as the auxiliary criterion for the live state, the accuracy of the high-voltage line live indication is improved, and through the redundant design of multiple criteria, when one of the criteria fails, the live state can still be judged by another criterion, thereby reducing misjudgment and improving stability and safety; by setting different criterion thresholds corresponding to different situations, setting a smaller threshold when both the electric field and the current are valid, and using a larger threshold when only one criterion is valid, the sensitivity is effectively improved; by monitoring the fluctuation of the electric field and dynamically adjusting the threshold, the device can adapt to changes in the environmental electric field, further improving the judgment accuracy, and also improving the anti-interference ability and stability in a complex electromagnetic environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is an electrical schematic diagram of a high-voltage line live indicator provided by an embodiment of the present invention;

[0031] Figure 2 It is a structural schematic diagram of a high-voltage line live indicator provided by an embodiment of the present invention;

[0032] Figure 3 The present invention is a schematic diagram of a working process of a high-voltage line live indicator provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1 and Figure 2 , Figure 1 It is an electrical schematic diagram of a high-voltage line live indicator provided by an embodiment of the present invention; Figure 2 The present invention provides a schematic diagram of a high-voltage line charge indicator. The high-voltage line charge indicator includes:

[0035] An indicator housing, a compression spring, a spherical lampshade containing a light-emitting tube, and a coupling voltage circuit, an induction current circuit, a power supply circuit, a card flipping indication module and a microprocessor located inside the indicator housing;

[0036] The microprocessor is configured to obtain a voltage signal from the coupling voltage circuit and a current signal from the induced current circuit; determine whether the measured circuit is energized based on the relationship between the voltage signal, the current signal and the corresponding preset threshold value; if it is determined that the measured circuit is energized, drive the flip indicator module to make the light-emitting tube emit light.

[0037] Specifically, the high-voltage line live indicator obtains the voltage of the high-voltage line through the compression spring, and the voltage is coupled through the coupling voltage circuit to obtain the coupled induced voltage (i.e., voltage signal), which characterizes the magnitude of the electric field strength as the first criterion; on the other hand, the current is obtained through the built-in current transformer (i.e., CT), and then the second criterion is obtained through the induced current circuit: the magnitude of the current signal. When the voltage signal and the current signal meet the corresponding threshold range, it is determined that the line is live. At this time, the microprocessor controls the flip card drive circuit to drive the light-emitting tube to work, so that the live indicator emits light to indicate that the measured line is live.

[0038] As one of the optional embodiments, a positioning foot is provided on the upper portion of the indicator housing, and the compression spring is hinged to the positioning foot.

[0039] As one of the optional embodiments, the coupling voltage circuit includes: a discharge tube, and a resonant circuit composed of a resistor, an inductor, and a capacitor;

[0040] The coupling voltage circuit is connected to the compression spring, and the compression spring is hung on the single end of the tested line when performing line detection; the compression spring serves as an induction coil, and obtains the voltage signal after coupling the electric field.

[0041] Specifically, the fixed compression spring is hung on the exposed high-voltage line single end. If the high-voltage line single end is energized, the fixed compression spring will have the same high voltage. The fixed compression spring is equivalent to an induction coil. After the induction coil couples the electric field, the corresponding coupling voltage (i.e., voltage signal) is obtained. The coupling voltage circuit is mainly a resonant circuit composed of a resistor R, an inductor L, and a capacitor C, in which the capacitor mainly plays a voltage-dividing role.

[0042] As one of the optional embodiments, the induction current circuit includes a signal sampling circuit and a signal amplification circuit;

[0043] The signal sampling circuit obtains a current sampling signal by coupling the magnetic field of the measured circuit through a built-in current transformer; the current sampling signal passes through the signal amplification circuit to obtain the current signal.

[0044] Specifically, the built-in CT senses the current, and the signal sampling circuit obtains the current sampling signal, and the current sampling signal enters the minimum microprocessing system through the signal amplification circuit, and the microprocessor performs data processing. The signal sampling circuit mainly includes a resistor, and the signal amplification circuit mainly includes an operational amplifier.

[0045] As one of the optional embodiments, the power supply circuit includes a power sampling circuit, a rectifier filtering and level conversion circuit, a lithium battery power supply circuit and an energy discharge circuit;

[0046] The power sampling circuit uses the magnetic saturation characteristics of the current transformer to obtain an AC voltage; the AC voltage is passed through the rectification, filtering and level conversion circuit to obtain a DC voltage to charge the lithium battery; the lithium battery power supply circuit is used to provide working power for the charged indicator.

[0047] Specifically, while obtaining the induced current, the magnetic saturation characteristics of the CT are used to obtain a relatively stable AC voltage. The AC voltage is rectified, filtered and converted into a level conversion circuit to obtain the DC voltage required for the operation of the microprocessor system. At the same time, the DC voltage charges the battery to increase the working life of the lithium battery. The lithium battery ensures the stability of the operation of the microprocessor system.

[0048] As one of the optional embodiments, the card flipping indication module includes a card flipping driving circuit and a card flipping indication circuit;

[0049] The card flipping driving circuit is used to drive the light-emitting tube in the card flipping indicating circuit to emit light and flash for display by adopting PWM pulse output mode when the tested circuit is energized.

[0050] Specifically, when the tested circuit is energized, the flip card driving circuit drives the light-emitting tube to work. In order to make the light-emitting tube indication effect more obvious, the PWM pulse output mode is used for driving. When the circuit is energized, the indicator flashes red; when the circuit loses power, the flip card indication module is turned off, and the indicator is displayed in white or does not emit light.

[0051] As one of the optional embodiments, judging whether the tested line is energized according to the relationship between the voltage signal, the current signal and the corresponding preset threshold value includes:

[0052] When there are the voltage signal and the current signal, if the voltage signal is greater than a first voltage threshold and the current signal is greater than a first current threshold, it is determined that the measured circuit is energized, otherwise it is determined that the measured circuit is not energized;

[0053] When there is the voltage signal and there is no current signal, if the voltage signal is greater than a second voltage threshold, it is determined that the tested circuit is energized, otherwise it is determined that the tested circuit is not energized;

[0054] When there is the current signal and there is no voltage signal, if the current signal is greater than the second current threshold, it is determined that the measured circuit is energized, otherwise it is determined that the measured circuit is not energized;

[0055] When there is no voltage signal and no current signal, it is determined that the measured circuit is not energized.

[0056] Furthermore, the first voltage threshold is smaller than the second voltage threshold, and the first current threshold is smaller than the second current threshold.

[0057] See also Figure 3 , Figure 3 This is a schematic diagram of the working process of a high-voltage line live indicator provided by an embodiment of the present invention. Specifically, after obtaining the voltage signal and the current signal, first determine whether the voltage signal / current signal is valid, that is, determine whether the voltage signal / current signal is greater than the corresponding initial threshold value, which is the stable reading or reference value presented by the measurement system when there is no signal to be measured. If the voltage signal / current signal is greater than the corresponding initial threshold value, it is determined that there is a voltage signal / current signal.

[0058] When both the voltage signal and the current signal are valid, a smaller judgment threshold is set; when only one signal is valid, a larger judgment threshold is set. When the voltage signal / current signal meets the threshold requirements, the measured line is determined to be energized. Among them, the voltage signal is an electric field coupling criterion, which directly measures the electric field strength around the line to determine the energized state of the line. However, if the electric field is used as the criterion alone, it may be interfered by the electric field of the adjacent line, resulting in misjudgment. Therefore, a magnetic field coupling criterion is added, and the current in the line is measured through an induction coil. If the current exists, it means that the line is energized. Since the magnetic field is directly related to the current, the magnetic field will only be detected if there is current in the measured line. Therefore, this criterion is used as an auxiliary criterion to effectively shield the influence of the electric field when the adjacent line is energized.

[0059] In addition, since there are multiple detection channels, when one detection channel fails, the other channels can still maintain normal operation, which improves the stability of the system and reduces misjudgments caused by failures.

[0060] As one of the optional embodiments, the microprocessor is further configured to:

[0061] The preset threshold is dynamically adjusted according to the fluctuation amplitude of the voltage signal within a preset time.

[0062] Furthermore, dynamically adjusting the preset threshold value according to the fluctuation amplitude of the voltage signal within a preset time includes:

[0063] Recording historical voltage signals within a preset historical time period, and obtaining the fluctuation amplitude of the voltage signals within the historical time period;

[0064] Determining whether the fluctuation amplitude is greater than a preset fluctuation threshold;

[0065] If yes, increasing the preset threshold corresponding to the voltage signal;

[0066] If not, the original preset threshold is maintained.

[0067] Specifically, in order to enable the charged display to accurately determine the charged state in a complex environment, the embodiment of the present invention monitors the real-time electric field and dynamically adjusts the threshold to suppress interference generated by adjacent lines or surrounding equipment.

[0068] By monitoring the short-term fluctuation of the electric field strength (i.e., voltage signal), if the fluctuation amplitude of the electric field is too large in a short period of time (such as 0.5 seconds), it is determined that the indicator may be affected by interference, and the threshold is appropriately increased to adapt to the electric field changes of instantaneous interference and reduce the risk of misjudgment. If the change of the electric field during monitoring is small, the current threshold is maintained. The embodiment of the present invention can adapt to the electromagnetic characteristics of the environment during operation, and improve the anti-interference ability and stability of the charged indicator in a complex electromagnetic environment.

[0069] Furthermore, the installation steps of the charged display of the embodiment of the present invention are: install the bracket on the operating rod through the joint bolts so that the positioning piece is in a freely extended state; place the charged indicator into the bracket so that the positioning piece supports the long groove of the charged indicator column; hook the compression spring of the charged indicator with a spring lifter, rotate the spring lifter downward to tilt the compression spring, and pull up the hook to hook the compression spring; when the hooks on both sides are hooked on the compression spring, pull out the spring lifter; pull up the two positioning pieces at the same time and hook them with the positioning hooks; set up the bracket with the charged indicator, align it with the wires and push it upwards, and after the compression spring clamps the wires, take away the operating lever with the bracket to complete the installation of the charged indicator.

[0070] The disassembly steps of the live indicator of the embodiment of the present invention are: put the bracket positioning piece in a natural state, lift the operating rod and push it upwards towards the live indicator on the line; after ensuring that the positioning piece presses the live indicator, pull the operating rod downwards to remove the live indicator.

[0071] The live display of the embodiment of the present invention uses a matching mounting bracket and a spring starter, and can be directly installed on the overhead wire when the line is live, thereby improving the work efficiency of front-line workers and having practical use value.

[0072] The embodiment of the present invention provides a high-voltage line energized indicator, which has the following beneficial effects: by using the electric field coupling method to obtain the electric field strength (i.e., voltage signal) around the high-voltage line as the main criterion for the energized state, and by using the magnetic field coupling method to obtain the current state in the line as the auxiliary criterion for the energized state, the accuracy of the high-voltage line energized indication is improved, and through the redundant design of multiple criteria, when one of the criteria fails, the energized state can still be judged by another criterion, thereby reducing misjudgment and improving stability and safety; by setting different criterion thresholds corresponding to different situations, setting a smaller threshold when both the electric field and the current are valid, and using a larger threshold when only one criterion is valid, the sensitivity is effectively improved; by monitoring the fluctuation of the electric field and dynamically adjusting the threshold, the device can adapt to changes in the environmental electric field, further improving the judgment accuracy, and also improving the anti-interference ability and stability in a complex electromagnetic environment.

[0073] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A high voltage line live indicator, characterized in that: include: An indicator housing, a compression spring, a spherical lampshade containing a light-emitting tube, and a coupling voltage circuit, an induction current circuit, a power supply circuit, a card flipping indication module and a microprocessor located inside the indicator housing; The microprocessor is configured to obtain a voltage signal from the coupling voltage circuit and a current signal from the induced current circuit; determine whether the measured circuit is energized based on the relationship between the voltage signal, the current signal and the corresponding preset threshold value; if it is determined that the measured circuit is energized, drive the flip indicator module to make the light-emitting tube emit light.

2. The high voltage line live indicator according to claim 1, characterized in that: The determining whether the tested line is energized according to the relationship between the voltage signal, the current signal and the corresponding preset threshold value comprises: When there are the voltage signal and the current signal, if the voltage signal is greater than a first voltage threshold and the current signal is greater than a first current threshold, it is determined that the measured circuit is energized, otherwise it is determined that the measured circuit is not energized; When there is the voltage signal and there is no current signal, if the voltage signal is greater than the second voltage threshold, it is determined that the tested circuit is energized, otherwise it is determined that the tested circuit is not energized; When there is the current signal and there is no voltage signal, if the current signal is greater than the second current threshold, it is determined that the measured circuit is energized, otherwise it is determined that the measured circuit is not energized; When there is no voltage signal and no current signal, it is determined that the measured circuit is not energized.

3. The high voltage line charged indicator according to claim 2, characterized in that: The first voltage threshold is smaller than the second voltage threshold, and the first current threshold is smaller than the second current threshold.

4. The high voltage line charged indicator according to claim 1, characterized in that: The microprocessor is further configured to: The preset threshold is dynamically adjusted according to the fluctuation amplitude of the voltage signal within a preset time.

5. The high voltage line live indicator according to claim 4, characterized in that: The dynamically adjusting the preset threshold value according to the fluctuation amplitude of the voltage signal within a preset time includes: Recording historical voltage signals within a preset historical time period, and obtaining the fluctuation amplitude of the voltage signals within the historical time period; Determining whether the fluctuation amplitude is greater than a preset fluctuation threshold; If yes, increasing the preset threshold corresponding to the voltage signal; If not, the original preset threshold is maintained.

6. The high voltage line charged indicator according to claim 1, characterized in that: The coupling voltage circuit includes: a discharge tube, and a resonant circuit composed of a resistor, an inductor, and a capacitor; The coupling voltage circuit is connected to the compression spring, and the compression spring is hung on the single end of the tested line when performing line detection; the compression spring serves as an induction coil, and obtains the voltage signal after coupling the electric field.

7. The high voltage line live indicator according to claim 1, characterized in that: The induction current circuit includes a signal sampling circuit and a signal amplification circuit; The signal sampling circuit obtains a current sampling signal by coupling the magnetic field of the measured circuit through a built-in current transformer; the current sampling signal passes through the signal amplification circuit to obtain the current signal.

8. The high voltage line live indicator according to claim 1, characterized in that: The power supply circuit includes a power sampling circuit, a rectification filtering and level conversion circuit, a lithium battery power supply circuit and an energy discharge circuit; The power sampling circuit uses the magnetic saturation characteristics of the current transformer to obtain an AC voltage; the AC voltage is passed through the rectification, filtering and level conversion circuit to obtain a DC voltage to charge the lithium battery; the lithium battery power supply circuit is used to provide working power for the charged indicator.

9. The high voltage line charged indicator according to claim 1, characterized in that: The card flipping indication module comprises a card flipping driving circuit and a card flipping indication circuit; The card flipping driving circuit is used to drive the light-emitting tube in the card flipping indicating circuit to emit light and flash for display by adopting PWM pulse output mode when the tested circuit is energized.

10. The high voltage line charged indicator according to claim 1, characterized in that: The upper part of the indicator housing is provided with a positioning foot, and the compression spring is hinged on the positioning foot.

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