CN118604548A - Insulator live detection device - Google Patents

Abstract

The present invention relates to the technical field of insulator detection, and specifically to an insulator live detection device, which comprises an insulating rod, a fixing part, a mobile detection mechanism and a controller, wherein the fixing part is located at the front end of the insulating rod, and the fixing part comprises two fixing forks and a walking track connecting the two fixing forks; the mobile detection mechanism comprises a walking mechanism, a detection end and a detection circuit, and two metal probes are arranged at the front end of the detection end; the detection circuit comprises a normal state detection circuit and a fault detection circuit connected in parallel, and the normal state detection circuit comprises a resistor R1, a transient suppression diode TVS1 and a green LED lamp connected in series; the fault detection circuit comprises a resistor R2 and a red LED lamp connected in series, and the red LED lamp is connected in parallel with a transient suppression diode TVS2; and the two metal probes are electrically connected to the normal state detection circuit and the fault detection circuit through a connecting part. The present invention can intuitively and accurately indicate the fault of an insulator piece, and is easy to operate.

Description

Insulator live detection device

Technical Field

The invention relates to the technical field of insulator detection, in particular to an insulator live detection device.

Background Art

In order to ensure the safe operation of power facilities and prevent accidents, insulators need to be inspected regularly. If each insulator in the insulator string is good, there will be a certain voltage distribution on each insulator during operation. If an insulator deteriorates or loses insulation due to deterioration, the voltage distribution value on the insulator will decrease or approach zero. When measuring, the measured voltage distribution value of each insulator is compared with the standard value. When the voltage distribution is lower than 50% of the standard value, it is considered "bad" or "zero value".

The existing detection method generally uses an insulator spark gap zero meter for measurement. When in use, the two metal ends contact the two ends of the insulator sheet, and the judgment is made based on the time and sound of the spark discharge. For example, the Chinese invention patent with the authorization announcement number CN102175897B discloses an angle self-locking spark gap short-circuit fork for porcelain bottle insulator detection, which is connected to the two ends of the insulator sheet through the contact and discharges at the electrode. The discharge spark and sound of this method are greatly affected by the environment, and need to be judged by experience, and the detection result is not intuitive. For another example, the Chinese utility model patent with the authorization announcement number CN206584006U discloses an insulator degradation detection device, which detects sparks by connecting between two metal contact wires through a spark detection device. The spark detection device discloses an indicator light alarm device and a sound alarm device. The patent has the following problems: when the voltage distribution of the insulator sheet is lower than 50% of the standard value, current will be generated after the two ends of the insulator sheet are short-circuited, and the indicator light alarm device and the sound alarm device will also issue a warning. Moreover, the voltage of the insulator sheet is high, and the spark detection device is easily damaged. Moreover, when there are three 35KV insulators, if one has a zero value, and if one of the remaining two has a zero value, continued detection will inevitably short-circuit the only good insulator, causing a single-phase grounding fault. Existing detection equipment cannot avoid the occurrence of such problems.

Summary of the invention

In view of the above-mentioned deficiencies in the prior art, the present invention provides an insulator live detection device which can intuitively and accurately indicate insulator segment faults and is easy to operate.

The technical solution adopted by the present invention to solve the technical problem is:

An insulator live detection device comprises an insulating rod, a fixing part, a mobile detection mechanism and a controller, wherein the fixing part is located at the front end of the insulating rod, and the fixing part comprises two fixing forks and a walking track connecting the two fixing forks; the mobile detection mechanism comprises a walking mechanism, a detection end and a detection circuit, wherein the detection end is arranged on the walking mechanism through a rotating drive mechanism, and the walking mechanism is located on the walking track; two metal probes are arranged at the front end of the detection end; the detection circuit comprises a normal state detection circuit and a fault detection circuit connected in parallel, wherein the normal state detection circuit comprises a resistor R1, a transient suppression diode TVS1 and a green LED lamp connected in series; the fault detection circuit comprises a resistor R2 and a red LED lamp connected in series, wherein the red LED lamp is connected in parallel with a transient suppression diode TVS2; the two metal probes are electrically connected to the normal state detection circuit and the fault detection circuit through a connecting part;

A detector corresponding to the insulator is arranged on the walking mechanism. When the detector detects that the walking mechanism moves to the position of the next insulator sheet, the walking mechanism stops moving, and the rotary drive mechanism drives the detection end to fall.

Furthermore, it also includes a third detection circuit, which includes a resistor R3, a yellow LED lamp and a capacitor C2 connected in series; both ends of the third detection circuit can be electrically connected to the metal probe through a connecting part.

Furthermore, the connecting part includes a movable rod and a movable rod reciprocating driving mechanism, the movable rod is an insulating rod, and conductive plates electrically connected to the metal probe are arranged at both ends of the movable rod; a first electrical connection end is arranged at the parallel point of the normal state detection circuit and the fault detection circuit respectively; the third detection circuit is arranged with two second electrical connection ends; the movable rod is located between the first electrical connection end and the second electrical connection end; when the movable rod reciprocating driving mechanism pushes the movable rod to reciprocate, the conductive plate is electrically connected to the first electrical connection end or the second electrical connection end.

Furthermore, it also includes a short-circuit rod connected to the movable rod reciprocating drive mechanism, and a swing arm is hinged at both ends of the short-circuit rod. The movable rod reciprocating drive mechanism drives the short-circuit rod to reciprocate, and the swing arm contacts the second electrical connection end and rotates to pass over the second electrical connection end.

Preferably, the resistor R1 and the resistor R2 are both adjustable resistors. Further preferably, the adjustable resistor is an electrically adjustable resistor.

Preferably, the detector is a rangefinder.

Furthermore, a movable joint is provided between the fixing portion and the insulating rod.

Furthermore, it also includes a remote controller communicatively connected to the controller.

The beneficial effects of the present invention are: it can intuitively and accurately identify the state of the insulator through the normal state detection circuit and the fault detection circuit, and can adjust the variable resistors in the normal state detection circuit and the fault detection circuit according to the voltage value change of the insulator piece, thereby improving the accuracy of detection and the safety of the detection circuit. The third detection circuit is used to avoid single-phase grounding faults when measuring 35KV insulators with 3 pieces, and the design of the short-circuit rod can realize the automatic discharge of the capacitor of the third detection circuit, and the third detection circuit can automatically switch with the normal state detection circuit and the fault detection circuit, which is convenient to use.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the state of the present invention when in use;

FIG2 is a schematic top view of the present invention and an insulator string;

FIG3 is a schematic structural diagram of a connecting portion, a short-circuit rod, a first electrical connection end, and a second electrical connection end of the present invention;

FIG4 is a schematic diagram showing the principles of a normal state detection circuit, a fault detection circuit and a third detection circuit of the present invention;

In the figure: 1. insulating rod; 101. movable joint; 2. fixing part; 201. fixing fork; 202. walking track; 3. mobile detection mechanism; 301. walking mechanism; 3011. through hole; 3012. roller; 302. detection end; 3021. metal probe; 303. rotation drive mechanism; 401. movable rod; 402. conductive plate; 403. lead screw; 404. motor; 405. conductive spring; 5. first electrical connection end; 501. metal vertical plate; 502. wiring terminal; 6. second electrical connection end; 7. short-circuit rod; 701. swing arm; 8. detector; 9. insulator sheet; 10. slide rail; 11. indicator light.

DETAILED DESCRIPTION

In order to better understand the present invention, the embodiments of the present invention are explained in detail below with reference to FIG. 1 to FIG. 4 .

The insulator live detection device of the present invention comprises an insulating rod 1, a fixed part 2, a mobile detection mechanism 3 and a controller. The fixed part 2 is located at the front end of the insulating rod 1, the fixed part 2 is made of insulating material, and the fixed part 2 comprises two fixed forks 201 and a walking track 202 connecting the two fixed forks 201. The mobile detection mechanism 3 comprises a walking mechanism 301, a detection end 302 and a detection circuit. The detection end 302 is rotatably arranged on the walking mechanism 301 through a rotating drive mechanism 303. The rotating drive mechanism 303 comprises a motor and a rotating shaft connected to the motor drive, and the detection end 302 is fixedly connected to the rotating shaft. The walking mechanism 301 is located on the walking track 202, and the walking mechanism 301 moves on the walking track 202 through a walking drive device. Preferably, as shown in FIG. 2, a through hole 3011 for the walking track 202 is arranged on the walking mechanism 301 of the present invention, and the through hole 3011 is a square hole matched with the walking track 202, and rollers 3012 are respectively arranged on the four faces of the through hole 3011, wherein at least one roller is connected to a driving motor. The driving motor, the detector 8 and the motor of the rotating driving mechanism 303 are connected to the controller respectively. Two metal probes 3021 are arranged at the front end of the detection end 302, and the shell of the detection end 302 is made of insulating material.

In order to facilitate the operation of the operators, the present invention provides a movable joint 101 between the insulating rod 1 and the fixed part 2. The movable joint 101 can adopt a damping shaft or a rotating joint with a locking device. When in use, the fixed part 2 and the insulating rod 1 are first adjusted to a suitable angle.

As shown in FIG4 , the detection circuit includes a normal state detection circuit and a fault detection circuit connected in parallel. The normal state detection circuit includes a resistor R1, a transient suppression diode TVS1 and a green LED lamp (LED1 in FIG4 ) connected in series, and the resistor R1 plays a role of current limiting and voltage dividing. The fault detection circuit includes a resistor R2 and a red LED lamp (LED2 in FIG4 ) connected in series, and a transient suppression diode TVS2 is connected in parallel to the red LED lamp, and the resistor R2 plays a role of current limiting and voltage dividing. The normal state detection circuit and the fault detection circuit share external wiring terminals e and f (equivalent to the parallel point), and the two metal probes can be electrically connected to the external wiring terminals e and f of the normal state detection circuit and the fault detection circuit respectively through the two electrical connection terminals a and b of the connecting part. The insulator sheet in operation is equivalent to capacitor C1. The working principle of the detection circuit is: the insulator sheet in the normal working state has a voltage distribution. When the metal probe contacts the two metal ends of the insulator sheet 9, the insulator sheet will short-circuit and discharge, which is equivalent to a capacitor C1. The voltage and current generated by the insulator sheet are reduced by resistors R1 and R2, but are still greater than the breakdown voltage of transient suppression diodes TVS1 and TVS2. Transient suppression diodes TVS1 and TVS2 are turned on. At this time, the normal state detection circuit is turned on, LED1 is lit, and LED2 of the fault detection circuit is short-circuited by transient suppression diode TVS2 and will not light up. When the insulator sheet fails, the voltage is less than 50% of the normal value. At this time, resistors R1 and R2 reduce the voltage and current to a level lower than the breakdown voltage of transient suppression diodes TVS1 and TVS2. Both transient suppression diodes TVS1 and TVS2 are not turned on, the normal state detection circuit is not turned on, the current flows through the fault detection circuit, and LED2 is lit.

When measuring 35KV insulators with 3 pieces, in order to prevent one piece of the insulator from having a zero value and one piece of the remaining 2 pieces from having a zero value, continuing to detect will short-circuit the only good insulator and cause a single-phase grounding fault, the present invention further designs a third detection circuit. As shown in FIG4, the third detection circuit includes a resistor R3, a yellow LED light (LED3 in FIG4) and a capacitor C2 connected in series, the resistor R3 plays a role of current limiting and voltage dividing, the capacitor C2 prevents grounding and lights up LED3 when charging. The two connection terminals c and d of the third detection circuit can be electrically connected to two metal probes through the two electrical connection terminals a and b of the connecting part. When the third detection circuit is needed, the two connection terminals c and d are electrically connected to the two metal probes through the electrical connection terminals a and b respectively. After the two metal probes contact the two metal ends of the insulator piece, the insulator piece charges the capacitor C2, and current is generated at this time, LED3 will be lit, and the quality of the insulator piece is judged according to the brightness of LED3. The green LED light, the red LED light and the yellow LED light are collectively referred to as the indicator light 11.

In order to realize the automatic switching of the detection mode, as shown in FIG3 , the present invention designs the following structure: the connecting part includes a movable rod 401 and a movable rod reciprocating drive mechanism. The movable rod reciprocating drive mechanism preferably adopts a screw mechanism, and the screw mechanism includes a screw 403 and a motor 404, and the screw 403 is made of insulating material. The movable rod 401 is an insulating rod, and the two ends of the movable rod 401 are provided with conductive plates 402 (i.e., points a and b in FIG4 ) that are electrically connected to the metal probe 3021 through a wire. Further, conductive springs 405 can be respectively provided on both sides of the conductive plate 402. The middle of the movable rod 401 is provided on the screw 403 through a nut, and the end of the screw 403 is connected to the motor 404. A first electrical connection terminal 5 (i.e., points f and e in FIG4 ) is respectively provided at the two parallel points of the normal state detection circuit and the fault detection circuit. The third detection circuit is provided with two second electrical connection terminals 6 (i.e., points c and d in FIG4 ). The first electrical connection terminal 5 and the second electrical connection terminal 6 both include a metal vertical plate and a terminal. Taking the first electrical connection terminal 5 as an example, the metal vertical plate 501 is L-shaped, the bottom of the metal vertical plate 501 is fixed by screws, and the terminal 502 includes a screw nut. The movable rod 401 is located between the first electrical connection terminal 5 and the second electrical connection terminal 6. When the movable rod reciprocating drive mechanism pushes the movable rod 401 to reciprocate, the conductive plate 402 is electrically connected to the first electrical connection terminal 5 or the second electrical connection terminal 6.

The principle of the third detection circuit is to use the flow of electric charge generated in the circuit when the capacitor C2 is charged to light up the yellow LED lamp. When the third detection circuit is used for the second time, the capacitor C2 needs to be discharged. Therefore, the present invention designs a discharge structure. Specifically, the discharge structure includes a short-circuit rod 7, and the short-circuit rod 7 is made of a metal conductive material. The short-circuit rod 7 is connected to the movable rod reciprocating drive mechanism, that is, the middle of the short-circuit rod 7 is arranged on the screw rod 403 through a nut. A swing arm 701 is respectively hingedly arranged at both ends of the short-circuit rod 7, and the movable rod reciprocating drive mechanism drives the short-circuit rod 7 to reciprocate. The swing arm 701 contacts the second electrical connection end 6 and then bends and crosses the second electrical connection end 6. In this process, when the swing arm 701 contacts the second electrical connection end 6, the capacitor C2 of the third detection circuit is short-circuited and discharged. In order to stabilize the movable rod 401 and the short-circuit rod 7, a slide rail 10 is arranged below the screw rod 403, and a projection that cooperates with the slide groove on the slide rail 10 is arranged at the middle bottom of the movable rod 401 and the short-circuit rod 7.

In order to realize that the mobile detection mechanism 3 automatically moves to the position of the next insulator piece 9 to be detected, the present invention is provided with a detector 8 facing the insulator direction on the walking mechanism 301. When the detector 8 detects that the walking mechanism 301 moves to the position of the next insulator piece, the walking mechanism 301 stops moving, the rotary drive mechanism 303 drives the detection end 302 to fall, and the metal probe 3021 contacts the two ends of the insulator piece 9. Preferably, the detector 8 is a rangefinder, and the rangefinder determines whether the walking mechanism 301 moves to the position of the next insulator piece by: the rangefinder moves to the edge position of the insulator piece 9, at which time the measured distance is the shortest. When the distance measured by the rangefinder starts to increase from the shortest, it is considered that the walking mechanism 301 is located at the position of the insulator piece 9 to be detected, and the controller controls the walking mechanism 301 to stop moving.

When measuring an insulator string with more insulator pieces, the maximum and minimum values of the voltage distribution of the insulators differ greatly. In order to ensure the normal operation of the normal state detection circuit and the fault detection circuit, the resistor R1 and the resistor R2 of the present invention are both adjustable resistors. The adjustable resistor is an electrically adjustable adjustable resistor, which is driven by a servo motor, and the servo motor is connected to the controller for control.

In order to facilitate operation, the present invention designs a remote controller, which is provided with operation buttons such as a resistance adjustment button, a third detection circuit switching button, a normal detection button, a capacitor discharge button of the third detection circuit, and a start detection button, and the controller is connected to the remote controller for communication. The resistance adjustment button can be used to increase or decrease the resistance R1 and the resistance R2. Each time the adjustment button is pressed, the resistance value increases or decreases by a set value, such as 2KΩ; one resistance adjustment button can be set to adjust the resistance R1 and the resistance R2 synchronously, or two resistance adjustment buttons can be set to adjust the resistance R1 and the resistance R2 separately. When the third detection circuit switching button is pressed, the movable rod reciprocating drive mechanism drives the movable rod 401 to electrically connect the conductive plate 402 to the second electrical connection terminal 6. When the normal detection button is pressed, the movable rod reciprocating drive mechanism drives the movable rod 401 to electrically connect the conductive plate 402 to the first electrical connection terminal 5. By pressing the capacitor discharge button of the third detection circuit, the movable rod reciprocating drive mechanism drives the movable rod 401 to move backward, so that the swing arm 701 is in electrical contact with the second electrical connection terminal 6. After waiting for a set time (such as 2 seconds), the movable rod reciprocating drive mechanism drives the movable rod 401 to move forward, so that the conductive plate 402 is electrically connected to the second electrical connection terminal 6. When the start detection button is pressed, the controller controls the walking mechanism 301 to move. When the detector 8 detects that the walking mechanism 301 is located at the position of the insulator piece 9 to be detected, the walking mechanism 301 stops moving, and the detection end 302 rotates toward the insulator piece under the drive of the rotation drive mechanism 303. After the metal probe 3021 contacts the two metal ends of the insulator piece 9 for a set time (such as 1 second), the rotation drive mechanism 303 drives the detection end 302 to rotate in the opposite direction, and the detection end 302 moves away from the insulator piece 9. Then the walking mechanism 301 automatically moves to the position of the next insulator piece to be detected, and the above steps are repeated to complete a series of insulator detections. Of course, the present invention can also change the detection of each insulator piece to be manually triggered, that is, a trigger button is set on the remote control, and the walking mechanism 301 starts detection after the trigger button is pressed once and moves to the position of the next insulator piece to be detected.

Although the above text and the drawings in the specification have shown and described the embodiments of the present invention, it is understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims (9)

1. An insulator live detection device, characterized in that: it comprises an insulating rod, a fixing part, a mobile detection mechanism and a controller, wherein the fixing part is located at the front end of the insulating rod, and the fixing part comprises two fixing forks and a walking track connecting the two fixing forks; the mobile detection mechanism comprises a walking mechanism, a detection end and a detection circuit, wherein the detection end is arranged on the walking mechanism through a rotating drive mechanism, and the walking mechanism is arranged on the walking track; two metal probes are arranged at the front end of the detection end; the detection circuit comprises a normal state detection circuit and a fault detection circuit connected in parallel, wherein the normal state detection circuit comprises a resistor R1, a transient suppression diode TVS1 and a green LED lamp connected in series; the fault detection circuit comprises a resistor R2 and a red LED lamp connected in series, wherein the red LED lamp is connected in parallel with a transient suppression diode TVS2; the two metal probes are electrically connected to the normal state detection circuit and the fault detection circuit through a connecting part; A detector corresponding to the insulator is arranged on the walking mechanism. When the detector detects that the walking mechanism moves to the position of the next insulator sheet, the walking mechanism stops moving, and the rotary drive mechanism drives the detection end to fall. 2. The insulator live detection device as described in claim 1 is characterized in that: it also includes a third detection circuit, the third detection circuit includes a resistor R3, a yellow LED lamp and a capacitor C2 connected in series; the two ends of the third detection circuit can be electrically connected to the metal probe through a connecting part. 3. The insulator live detection device as described in claim 2 is characterized in that: the connecting part includes a movable rod and a movable rod reciprocating driving mechanism, the movable rod is an insulating rod, and conductive plates electrically connected to the metal probe are arranged at both ends of the movable rod; a first electrical connection end is arranged at the parallel point of the normal state detection circuit and the fault detection circuit respectively; the third detection circuit is provided with two second electrical connection ends; the movable rod is located between the first electrical connection end and the second electrical connection end; when the movable rod reciprocating driving mechanism pushes the movable rod to reciprocate, the conductive plate is electrically connected to the first electrical connection end or the second electrical connection end. 4. The insulator live detection device as described in claim 3 is characterized in that it also includes a short-circuit rod connected to the movable rod reciprocating drive mechanism, and a swing arm is hinged at both ends of the short-circuit rod. The movable rod reciprocating drive mechanism drives the short-circuit rod to reciprocate, and the swing arm contacts the second electrical connection end and rotates to pass over the second electrical connection end. 5. The insulator live detection device as described in claim 1, characterized in that the resistor R1 and the resistor R2 are both adjustable resistors. 6. The insulator live detection device as described in claim 5, characterized in that the adjustable resistor is an electrically adjustable resistor. 7. The insulator live detection device as described in claim 1, characterized in that the detector is a rangefinder. 8. The insulator live detection device according to any one of claims 1 to 7, characterized in that a movable joint is provided between the fixing portion and the insulating rod. 9. The insulator live detection device according to any one of claims 1 to 7, characterized in that it also includes a remote controller communicatively connected to the controller.