A passive high-voltage direct-current acousto-optic electroscope based on corona discharge principle

Abstract

The application provides a passive high-voltage direct-current sound-light electricity testing device based on corona discharge principle, which comprises an insulating probe, an insulating telescopic rod and an insulating handle. The insulating probe comprises a probe, an insulating sleeve, a sound-light alarm unit, a pull rod antenna and a corona discharge needle. The probe is fixedly sleeved on the insulating sleeve, one end of the probe extends out of the front end of the insulating sleeve and is exposed in the atmosphere, and the other end of the probe is connected with the sound-light alarm unit in the insulating sleeve. One end of the pull rod antenna is connected with a wire output from the sound-light alarm unit, and the other end of the pull rod antenna is connected with the corona discharge needle. The corona discharge needle is suspended in the insulating telescopic rod. The front end of the insulating telescopic rod is connected with the insulating sleeve, and the tail end of the insulating telescopic rod is sleeved with the insulating handle. The device has simple structure, does not need battery power supply, is passive, is convenient to use, is environment-friendly, has stronger anti-interference and anti-overvoltage capacity, and has more reliable performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-voltage live equipment testing, and in particular to a passive high-voltage DC sound-light testing device based on corona discharge principle. BACKGROUND

[0002] The testing device is a device for testing whether a high-voltage conductor carries dangerous high voltage, and plays an important role in protecting the personal safety and equipment safety of circuit system maintenance personnel. In recent years, with the rapid development of the power system, there are more and more high-voltage equipment, and the maintenance and defect elimination work is also increasing, so the testing work is also increasing, and the convenience and reliability of testing are also improving.

[0003] Currently developed live indication devices include aluminum foil testers and leakage detection type live indication devices. The aluminum foil tester can test whether a conductor carries AC or DC high voltage without battery power supply, but the aluminum foil tester needs to be sealed with an insulating cover to prevent external airflow from deforming the aluminum foil or affecting the expansion and closing state of the aluminum foil, which may lead to incorrect judgment by the tester. The leakage detection type live indication device uses a battery for power supply, which is inconvenient and not environmentally friendly to replace or charge. Moreover, the device has voltage detection, overvoltage protection, safety grounding and other links, and the structure is complex. Moreover, for different testing voltage levels, corresponding testing heads of different voltage levels are required. If the testing head does not match the voltage level of the target conductor to be tested, the testing head may fail to operate or malfunction, or even be damaged.

[0004] The invention patent application with publication number CN115856380A and the patent name of a high-voltage live passive flash indication device based on corona discharge energy extraction adopts the corona discharge principle of the invention patent application with publication number CN112993761A and the patent name of a high-voltage transmission line on-site energy extraction device, uses an energy storage capacitor to extract energy from the high-voltage transmission line, and uses a short-time conduction switch based on the corona repulsion principle to control the discharge of the energy storage capacitor to the LED lamp, thereby completing the high-voltage live passive flash indication work. However, the inventors of the present application have found that the short-time conduction switch and the on-site energy extraction voltage of the energy storage capacitor are not necessarily completely synchronized in time, the live flash indication effect is not ideal, and the structure of the device is slightly complex.

[0005] Therefore, it is of great significance to innovatively develop a testing device with a simpler structure, stable and reliable performance, convenient use and environmental protection to ensure the safe and stable operation of the power system. SUMMARY

[0006] In view of the technical problems of the existing high-voltage testing device, such as complex structure, instability, poor reliability, inconvenient use and environmental protection, the present application provides a passive high-voltage DC sound-light testing device based on corona discharge principle.

[0007] To solve the above technical problems, the application adopts the following technical solutions:

[0008] A passive high-voltage direct-current sound-light electric testing device based on corona discharge principle, comprising an insulating probe, an insulating telescopic rod and an insulating handle, the insulating probe comprises a probe, an insulating sleeve, a power-taking sound-light alarm unit, a pull rod antenna and a corona discharge needle, the probe is fixedly sleeved on the insulating sleeve, one end of the probe extends out of the front end of the insulating sleeve and is exposed to the atmosphere, the other end of the probe is connected to the power-taking sound-light alarm unit inside the insulating sleeve, one end of the pull rod antenna is connected to the wire output inside the power-taking sound-light alarm unit, the other end of the pull rod antenna is connected to the corona discharge needle, the corona discharge needle is suspended in the insulating telescopic rod, the front end of the insulating telescopic rod is connected to the insulating sleeve, and the tail end of the insulating telescopic rod is sleeved with the insulating handle.

[0009] The power-taking sound-light alarm unit comprises an electric field shielding body and an insulating sleeve, the lower side of the electric field shielding body is provided with a slot hole, the insulating sleeve is fixedly embedded in the slot hole, the electric field shielding body is provided with a power-taking capacitor, a bidirectional thyristor trigger tube, a first adjustable resistor, a second adjustable resistor, a third adjustable resistor, a first light-emitting diode, a second light-emitting diode and a buzzer, one end of the power-taking capacitor and the bidirectional thyristor trigger tube is connected to the other end of the probe through a wire, the other end of the power-taking capacitor is connected to one end of the pull rod antenna through a wire arranged in the insulating sleeve, the other end of the bidirectional thyristor trigger tube is connected to one end of the first adjustable resistor, the second adjustable resistor and the third adjustable resistor, one end of the first light-emitting diode is connected to the other end of the first adjustable resistor, one end of the second light-emitting diode is connected to the other end of the second adjustable resistor, one end of the buzzer is connected to the other end of the third adjustable resistor, and the other ends of the first light-emitting diode, the second light-emitting diode and the buzzer are connected to the other end of the power-taking capacitor.

[0010] When using the passive high-voltage DC audible and visual voltage detector based on the corona discharge principle provided by this invention, the telescopic antenna is first stretched or compressed to a certain length. Then, the insulated probe is connected to the front end of the insulated telescopic rod through the insulated sleeve. Then, the probe is used to contact the high-voltage DC conductor to be tested by holding the insulated handle. At this time, because the tip of the corona discharge needle is very thin, corona discharge will be generated at the tip. The corona discharge current will start to charge the energy harvesting capacitor. When the charging voltage of the energy harvesting capacitor is low, the bidirectional thyristor trigger tube does not operate. When the charging voltage of the energy harvesting capacitor rises to the operating voltage of the bidirectional thyristor trigger tube after a period of charging, the PN junction inside the bidirectional thyristor trigger tube breaks down and short-circuits. The electrical energy stored in the energy harvesting capacitor immediately discharges to the load of each branch through the three adjustable resistors, driving the first light-emitting diode or the second light-emitting diode to light up and the buzzer to sound, thereby completing the audible and visual alarm for voltage testing of the high-voltage DC conductor.

[0011] Compared with existing technologies, the passive high-voltage DC acoustic-optical voltage detector based on the corona discharge principle provided by this invention utilizes the characteristics of high voltage in DC high-voltage conductors and the ease with which corona discharge occurs at pointed protrusions. This passive high-voltage DC acoustic-optical voltage detector based on the corona discharge principle has the following advantages: 1) The device requires no battery power, is passive, and is convenient and environmentally friendly; 2) The circuit structure of the device is extremely simple, compact, and practical, and all electronic components used are conventional; 3) The circuit of this device does not contain the high-amplification operational amplifier of current voltage detectors, nor does it have moving parts, resulting in stronger anti-interference and overvoltage resistance, and more reliable performance.

[0012] Furthermore, the electric field shield and the insulating sleeve are provided with openings arranged opposite to each other.

[0013] Furthermore, the capacitance of the energy-harvesting capacitor is 4.7 to 10 μF, and the withstand voltage is 630 V.

[0014] Furthermore, the resistances of the first adjustable resistor, the second adjustable resistor, and the third adjustable resistor are 100 to 1000 ohms.

[0015] Furthermore, the first light-emitting diode is a red light-emitting diode, and the second light-emitting diode is a green light-emitting diode.

[0016] Furthermore, the buzzer is selected as a high-impedance buzzer with a impedance of 100 to 1000 ohms.

[0017] Furthermore, the electric field shield is also provided with a buffer capacitor and a transient overvoltage suppression diode. One end of the buffer capacitor and the transient overvoltage suppression diode is connected to the other end of the bidirectional thyristor trigger tube, and the other end of the buffer capacitor and the transient overvoltage suppression diode is connected to the other end of the energy harvesting capacitor.

[0018] Furthermore, the buffer capacitor has a capacitance of 22–47 μF and a withstand voltage of 100 V; the transient overvoltage suppression diode has a withstand voltage of 5.8–6.8 V and a rated current of 1–2 A.

[0019] Furthermore, the telescopic length of the telescopic antenna is 5 to 25 cm.

[0020] Furthermore, the corona discharge needle is made of molybdenum wire or stainless steel wire with a length of 1-2 cm and a diameter of 0.1 cm. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the passive high-voltage DC acoustic-optical voltage detector based on the principle of corona discharge provided by the present invention.

[0022] Figure 2 This is a schematic diagram of the circuit structure of the energy harvesting sound and light alarm unit provided by the present invention.

[0023] In the diagram, 1. Insulated probe; 11. Probe; 12. Insulated sleeve; 13. Energy harvesting audible and visual alarm unit; 131. Electric field shield; 132. Insulated sleeve; 133. Opening; 14. Pull-up antenna; 15. Corona discharge needle; 2. Insulated telescopic rod; 3. Insulated handle; 10. High voltage DC conductor. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0025] In the description of this invention, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Please refer to Figure 1 and Figure 2 As shown, this invention provides a passive high-voltage DC audible and visual voltage detector based on the principle of corona discharge, including an insulating probe 1, an insulating telescopic rod 2, and an insulating handle 3. The insulating probe 1 includes a probe 11, an insulating sleeve 12, an energy-harvesting audible and visual alarm unit 13, a telescopic antenna 14, and a corona discharge needle 15. The probe 11 is fixedly sleeved on the insulating sleeve 12. Specifically, the insulating sleeve 12 has a pre-set through hole, and the probe 11 is fixedly inserted into the through hole. One end of the probe 11 extends out of the front end of the insulating sleeve and is exposed to the atmosphere, while the other end of the probe 11 is connected to the insulating sleeve. The energy-harvesting audible and visual alarm unit 13 is located inside the body 12. One end of the telescopic antenna 14 is connected to a wire output from the energy-harvesting audible and visual alarm unit 13, and the other end of the telescopic antenna 14 is connected to a corona discharge needle 15, which is suspended inside the insulating telescopic rod 2. That is, the insulating telescopic rod 2 is a hollow insulating telescopic rod. The front end of the insulating telescopic rod 2 is installed and connected to the insulating sleeve 12. Specifically, the front end of the insulating telescopic rod 2 can be installed and connected to the insulating sleeve 12 by screwing or snapping. The tail end of the insulating telescopic rod 2 is fitted with an insulating handle 3.

[0028] The energy-harvesting audible and visual alarm unit 13 includes an electric field shield 131 and an insulating sleeve 132. The electric field shield 131 has a slot on its lower side, and the insulating sleeve 132 is fixedly embedded in the slot. The electric field shield 131 contains an energy-harvesting capacitor C1, a bidirectional thyristor trigger diode DB, a first adjustable resistor R1, a second adjustable resistor R2, a third adjustable resistor R3, a first light-emitting diode D1, a second light-emitting diode D2, and a buzzer Sp. One end of the energy-harvesting capacitor C1 and the bidirectional thyristor trigger diode DB is connected to the other end of a probe 11 via a wire. The other end of the energy-harvesting capacitor C1 is connected to one end of a telescopic antenna 14 via a wire passing through the insulating sleeve 132. The insulating sleeve 132 is used to maintain electrical isolation between the telescopic antenna 14 and the electric field shield 131. The bidirectional thyristor... The other end of the trigger transistor DB is connected to one end of the first adjustable resistor R1, the second adjustable resistor R2, and the third adjustable resistor R3. One end of the first light-emitting diode D1 is connected to the other end of the first adjustable resistor R1. One end of the second light-emitting diode D2 is connected to the other end of the second adjustable resistor R2. One end of the buzzer Sp is connected to the other end of the third adjustable resistor R3. The other ends of the first light-emitting diode D1, the second light-emitting diode D2, and the buzzer Sp are all connected to the other end of the power-collecting capacitor C1. Thus, the three parallel branches of the first adjustable resistor R1-first light-emitting diode D1, the second adjustable resistor R2-second light-emitting diode D2, and the third adjustable resistor R3-buzzer Sp form an audio-visual indication circuit. This audio-visual indication circuit and the power-collecting capacitor C1 form a voltage detection circuit.

[0029] When using the passive high-voltage DC audible and visual voltage detector based on the corona discharge principle provided by this invention, first stretch or compress the telescopic antenna to a certain length, then connect the insulated probe to the front end of the insulated telescopic rod through the insulated sleeve, and then hold the insulated handle and use the probe to contact the high-voltage DC conductor 10 to be tested. At this time, because the tip of the corona discharge needle is very thin, corona discharge will be generated at the tip, and the corona discharge current will start to charge the energy harvesting capacitor. When the charging voltage of the energy harvesting capacitor is low, the bidirectional thyristor trigger tube does not operate. When the charging voltage of the energy harvesting capacitor rises to the operating voltage of the bidirectional thyristor trigger tube after a period of charging, the PN junction inside the bidirectional thyristor trigger tube breaks down and short-circuits. The electrical energy stored in the energy harvesting capacitor immediately discharges to the load of each branch through the three adjustable resistors, driving the first light-emitting diode or the second light-emitting diode to light up and the buzzer to sound, thereby completing the audible and visual alarm for voltage testing of the high-voltage DC conductor.

[0030] Compared with existing technologies, the passive high-voltage DC acoustic-optical voltage detector based on the corona discharge principle provided by this invention utilizes the characteristics of high voltage in DC high-voltage conductors and the ease with which corona discharge occurs at pointed protrusions. This passive high-voltage DC acoustic-optical voltage detector based on the corona discharge principle has the following advantages: 1) The device requires no battery power, is passive, and is convenient and environmentally friendly; 2) The circuit structure of the device is extremely simple, compact, and practical, and all electronic components used are conventional; 3) The circuit of this device does not contain the high-amplification operational amplifier of current voltage detectors, nor does it have moving parts, resulting in stronger anti-interference and overvoltage resistance, and more reliable performance.

[0031] For a specific embodiment, please refer to Figure 1 and Figure 2 As shown, the electric field shield 131 and the insulating sleeve 12 are provided with openings 133 arranged opposite to each other. Thus, when the electric field shield 131 is an opaque shield, sound and light emission from the LED can pass through smoothly, making it convenient to listen and observe.

[0032] In a specific embodiment, the capacitance of the energy-harvesting capacitor C1 is 4.7–10 μF, and its withstand voltage is 630 V. This ensures that the energy stored in the energy-harvesting capacitor C1 is sufficient to simultaneously drive a typical LED D1 or D2 to flash normally, and a typical buzzer Sp to emit an alarm sound. That is, if the capacitance is too large, the voltage rise of the energy-harvesting capacitor C1 may be too slow, resulting in a too low frequency of audible and visual alarms; conversely, if the capacitance is too small, the voltage rise of the energy-harvesting capacitor C1 may be too fast, resulting in a too high frequency of audible and visual alarms, or an too short duration for each audible and visual alarm. Both excessively large and insufficient capacitance values ​​are detrimental to the accurate judgment of whether the high-voltage DC conductor under test is energized.

[0033] In a specific embodiment, the resistances of the first adjustable resistor R1, the second adjustable resistor R2, and the third adjustable resistor R3 are 100 to 1000 ohms. This limits the current of the light-emitting diodes D1 and D2, which can clearly indicate whether the high-voltage DC conductor under test is charged, and also protect the current flowing through each light-emitting diode from exceeding the safety threshold. It can also appropriately extend the duration of the voltage on the energy-collecting capacitor C1 or the buffer capacitor C2 mentioned later, so that the duration of each audible and visual alarm is longer, and the alarm sound of the buzzer Sp is not particularly loud (generally, buzzers are particularly loud at close range).

[0034] In a specific embodiment, the first light-emitting diode D1 is a red light-emitting diode, and the second light-emitting diode D2 is a green light-emitting diode. This facilitates the differentiation of the polarity of the high voltage carried by the high voltage DC conductor being tested. For example, when the first light-emitting diode D1 emits light, the high voltage carried by the high voltage DC conductor being tested is positive, and conversely, when the second light-emitting diode D2 emits light, the high voltage carried by the high voltage DC conductor being tested is negative.

[0035] In a specific embodiment, the buzzer Sp is selected as a high-impedance buzzer with a impedance of 100 to 1000 ohms, which allows for a longer duration of each audible and visual alarm, since the total electrical energy stored in the energy harvesting capacitor C1 is limited each time an alarm is triggered.

[0036] For a specific embodiment, please refer to Figure 2 As shown, the electric field shield 131 is also equipped with a buffer capacitor C2 and a transient overvoltage suppression diode D. One end of the buffer capacitor C2 and the transient overvoltage suppression diode D is connected to the other end of the bidirectional thyristor trigger diode DB, and the other end of the buffer capacitor C2 and the transient overvoltage suppression diode D is connected to the other end of the energy harvesting capacitor C1. Thus, the high voltage (generally greater than 30V) stored on the energy harvesting capacitor C1 can be converted into a low voltage (5V) suitable for the rated operating voltage of the light-emitting diodes D1 and D2 and the buzzer Sp through the buffer capacitor C2, thereby extending the duration of the audible and visual alarm and facilitating personnel judgment. By using a bidirectional device, the transient overvoltage suppression diode D limits the positive or negative lightning or operational overvoltage that may be transmitted from the high voltage DC conductor under test, protecting the light-emitting diodes D1 and D2 from breakdown and effectively improving the reliability of the entire voltage detection circuit.

[0037] In a specific embodiment, the capacitance of the buffer capacitor C2 is 22-47uF and the withstand voltage is 100V; the withstand voltage of the transient overvoltage suppression diode D is 5.8-6.8V and the rated current is 1-2A, thus providing sufficient dissipation capability to reliably protect the light-emitting diodes D1 and D2 from breakdown; at the same time, the leakage is particularly small, so as not to significantly shorten the duration of each audible and visual alarm.

[0038] As a specific embodiment, the telescopic length of the telescopic antenna 14 is 5 to 25 cm. This allows for the testing of low-voltage DC conductors when the antenna length is long, and high-voltage DC conductors when the antenna length is short, so that one device can adapt to different voltage levels.

[0039] In a specific embodiment, the corona discharge needle 15 is made of molybdenum wire or stainless steel wire with a length of 1-2 cm and a diameter of 0.1 cm. This ensures both the mechanical structural characteristics of the corona electrode, such as its bending strength, and prevents the electrode tip from chemically corroding with oxygen in the air when testing high voltage. This ensures that the voltage testing device can effectively corona discharge at various high voltage levels, both indoors and outdoors, providing corona energy for the audible and visual alarm. Of course, those skilled in the art can also use other thinner and harder metal materials based on the aforementioned embodiments.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A passive high-voltage direct-current acousto-optic electroscope based on the principle of corona discharge, characterized in that, The insulating probe includes a probe, an insulating sleeve, a power-taking sound-light alarm unit, a pull rod antenna and a corona discharge needle, the probe is fixedly sleeved on the insulating sleeve, one end of the probe is exposed in the atmosphere by extending out of the front end of the insulating sleeve, the other end of the probe is connected to the power-taking sound-light alarm unit inside the insulating sleeve, one end of the pull rod antenna is connected to the wire outputted from the power-taking sound-light alarm unit, the other end of the pull rod antenna is connected to the corona discharge needle, the corona discharge needle is suspended in the insulating telescopic rod, the front end of the insulating telescopic rod is connected to the insulating sleeve, and the tail end of the insulating telescopic rod is sleeved with the insulating handle. The power-taking sound-light alarm unit includes an electric field shielding body and an insulating sleeve, the lower side of the electric field shielding body is provided with a slot hole, the insulating sleeve is fixedly embedded in the slot hole, the electric field shielding body is provided with a power-taking capacitor, a bidirectional thyristor trigger tube, a first adjustable resistor, a second adjustable resistor, a third adjustable resistor, a first light emitting diode, a second light emitting diode and a buzzer, one end of the power-taking capacitor and the bidirectional thyristor trigger tube is connected to the other end of the probe through a wire, the other end of the power-taking capacitor is connected to one end of the pull rod antenna through a wire arranged in the insulating sleeve, the other end of the bidirectional thyristor trigger tube is connected to one end of the first adjustable resistor, the second adjustable resistor and the third adjustable resistor, one end of the first light emitting diode is connected to the other end of the first adjustable resistor, one end of the second light emitting diode is connected to the other end of the second adjustable resistor, one end of the buzzer is connected to the other end of the third adjustable resistor, and the other ends of the first light emitting diode, the second light emitting diode and the buzzer are connected to the other end of the power-taking capacitor.

2. The passive high voltage DC acousto-optic electroscope based on corona discharge principle according to claim 1, characterized in that, The electric field shielding body and the insulating sleeve are provided with relatively arranged openings.

3. The passive high voltage DC acousto-optic electroscope based on corona discharge principle according to claim 1, characterized in that, The capacitance value of the power-taking capacitor is 4.7-10uF, and the withstand voltage value is 630V.

4. The passive high voltage DC acousto-optic electroscope based on corona discharge principle according to claim 1, characterized in that, The resistance of the first adjustable resistor, the second adjustable resistor and the third adjustable resistor is 100-1000 ohms.

5. The passive high voltage DC acousto-optic electroscope based on corona discharge principle according to claim 1, characterized in that, The first light emitting diode is a red light emitting diode, and the second light emitting diode is a green light emitting diode.

6. The passive high voltage DC acousto-optic electroscope based on corona discharge principle as claimed in claim 1, wherein, The buzzer is selected to be a 100-1000 ohm high impedance buzzer.

7. The passive high voltage DC acousto-optic electroscope based on corona discharge principle as claimed in claim 1, wherein, The electric field shielding body is further provided with a buffer capacitor and a transient overvoltage suppression diode, one end of the buffer capacitor and the transient overvoltage suppression diode is connected to the other end of the bidirectional thyristor trigger tube, and the other end of the buffer capacitor and the transient overvoltage suppression diode is connected to the other end of the power-taking capacitor.

8. The passive high voltage DC acousto-optic electroscope based on corona discharge principle according to claim 7, characterized in that, The capacitance value of the buffer capacitor is 22-47uF, and the withstand voltage value is 100V; the withstand voltage value of the transient overvoltage suppression diode is 5.8-6.8V, and the rated current is 1-2A.

9. The passive high voltage DC acousto-optic electroscope based on corona discharge principle as claimed in claim 1, wherein, The telescopic length of the pull rod antenna is 5-25cm.

10. The passive high voltage DC acousto-optic electroscope based on corona discharge principle as claimed in claim 1, wherein, The corona discharge needle adopts a molybdenum wire or a stainless steel wire with a length of 1-2cm and a diameter of 0.1cm.

Images