A porcelain insulator string zero value detection auxiliary device

Abstract

The present invention discloses a porcelain insulator string zero value detection auxiliary device, which is used to solve the problem of low efficiency and long time consumption of the insulation resistance method used for porcelain insulators in the prior art. It includes: each insulator sheet is connected to both ends of the insulation resistance meter after being connected in parallel; two insulator sheets form a group, and each group of insulator sheets is connected in parallel and sequentially connected to a current sampling circuit, a comparison circuit and a light alarm circuit, and the output end of each comparison circuit is connected to a sound alarm circuit, and the current sampling circuit, the comparison circuit, the light alarm circuit and the sound alarm circuit are all connected to a power module. Beneficial effects include: through the use of a special auxiliary device for zero value detection of porcelain insulator strings in substations, the test time is greatly shortened while also reducing the workload of maintenance personnel, greatly improving the accuracy and reliability of receiving test signals, improving the work efficiency of operators, and reducing operation time.

Description

Technical Field

[0001] The invention relates to the technical field of electric power, and in particular to a porcelain insulator string zero value detection auxiliary device. Background Art

[0002] With the rapid development of social economy, the power supply load is increasing day by day, and the construction of new substations and new electrical equipment has increased significantly. The contradiction between the safety production pressure and the equipment maintenance and repair efficiency has become increasingly prominent. How to complete the maintenance plan on schedule while strengthening safety production management and avoiding the occurrence of safety incidents has become an urgent problem to be solved. The zero-value detection of insulators in 220kV and below stations has been analyzed and studied. Insulators are an important component of transmission and transformation equipment. Their main function is to isolate the high potential of the line conductor from the ground potential of the tower and the frame to achieve electrical insulation and mechanical fixation. During transportation and construction, they may leave scars due to collisions; during operation, they may be broken or damaged due to lightning accidents; due to the long-term combined action of mechanical load and high voltage, they deteriorate. When there are low-value or zero-value insulators in the insulator string, flashover accidents are prone to occur in a dirty environment, under overvoltage or even working voltage. Therefore, strengthening the effective detection and quality evaluation of porcelain insulators in the power grid is crucial to ensure the safe, reliable and economical operation of the power grid.

[0003] The workload of testing porcelain insulators is huge. According to the status inspection and maintenance regulations for power transmission and transformation equipment, the zero-value inspection of insulators at voltage levels of 110kV and above in the station is completed every three years. The maintenance personnel conducted statistics on this work and found that it takes 3.5 years of uninterrupted work to complete this work (the daily workload is calculated as 24 hours), which seriously exceeds the carrying capacity of the personnel. At present, the State Grid Corporation uses the insulation resistance method to conduct zero-value inspection of porcelain insulators in substations. This method requires the insulators to be inspected piece by piece, which is time-consuming overall.

[0004] To sum up, in order to address the problem of the large number of voltage application and discharge operations, which is an important reason affecting the long zero-value detection time of porcelain insulator strings, a special auxiliary device for zero-value detection of porcelain insulator strings in substations was developed to effectively solve the actual problems on site. Summary of the invention

[0005] The embodiment of the present invention provides a porcelain insulator string zero value detection auxiliary device to solve the problem that the insulation resistance method used for porcelain insulators in the prior art is inefficient and time-consuming.

[0006] A porcelain insulator string zero value detection auxiliary device comprises: each insulator piece is connected in parallel to two ends of an insulation resistance meter; two insulator pieces form a group, each group of insulator pieces are connected in parallel and sequentially connected to a current sampling circuit, a comparison circuit and a light alarm circuit, the output end of each comparison circuit is connected to a sound alarm circuit, and the current sampling circuit, the comparison circuit, the light alarm circuit and the sound alarm circuit are all connected to a power module.

[0007] Preferably, the porcelain insulator zero value detection auxiliary device also includes a current display module, which includes an ammeter, one end of each ammeter is connected to the ground terminal of the insulation resistance meter, and each group of insulator sheets is electrically connected to the other end of the corresponding ammeter after being connected in parallel.

[0008] Preferably, the power module includes a device switch, a DC input terminal and a rechargeable battery connected in series; the DC input terminal provides a 12V DC voltage, and the rechargeable battery outputs a 5V voltage.

[0009] Preferably, the light alarm circuit includes a light emitting diode. When the current value in the current sampling circuit is higher than a set threshold value in the comparison circuit, the comparison circuit outputs a high level and the light emitting diode connected to the output end of the comparison circuit is turned on.

[0010] Preferably, the sound alarm circuit includes a diode and a buzzer. When the current value in any current sampling circuit is higher than the set threshold value in the corresponding comparison circuit, the corresponding comparison circuit outputs a high level, and the diode connected to the output end of the corresponding comparison circuit is turned on to drive the buzzer.

[0011] Preferably, the device is a box, and a current sampling circuit, a comparison circuit, a light alarm circuit, an acoustic alarm circuit and a power module are arranged inside the box; the upper surface of the box is a device panel, and the device switch, the terminal blocks inserted after each group of insulator pieces are connected in parallel, the terminals inserted at both ends of each group of insulator pieces, the grounding terminal blocks, the L terminal blocks and the E terminal blocks connected to the insulation resistance meter, and the light-emitting diodes are arranged on the device panel; a buzzer is arranged on the side of the box.

[0012] Preferably, the device panel is made of epoxy resin board.

[0013] Preferably, the terminals inserted after each group of insulator pieces are connected in parallel, the terminals inserted at both ends of each group of insulator pieces, the grounding terminals, and the L terminals and E terminals connected to the insulation resistance meter are pure copper terminals.

[0014] The beneficial effects of the present invention include: by using a special auxiliary device for zero-value detection of a substation porcelain insulator string, the test time is greatly shortened while also reducing the workload of maintenance personnel, greatly improving the accuracy and reliability of receiving test signals, improving the work efficiency of operators, and reducing operation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a circuit diagram of a porcelain insulator string zero value detection auxiliary device in an embodiment of the present invention;

[0016] Figure 2 It is a circuit diagram of a unit of the porcelain insulator string zero value detection auxiliary device in an embodiment of the present invention;

[0017] Figure 3 is a circuit diagram of a current display module in an embodiment of the present invention;

[0018] Figure 4 for Figure 1 A magnified schematic of the circuit in the upper middle section. DETAILED DESCRIPTION

[0019] In order to provide a porcelain insulator string zero value detection auxiliary device with high test efficiency, the preferred embodiments of the present invention are described below in conjunction with the accompanying drawings of the specification.

[0020] The porcelain insulator zero value detection auxiliary device of the present invention mainly reduces the number of operations of applying voltage and discharging to each insulator during the porcelain insulator test to one time. If a zero value insulator appears, an audible and visual alarm will be issued, thereby shortening the maintenance operation time.

[0021] See also Figure 1-Figure 4 As shown in the figure, the circuit connection diagram of two groups of insulator sheets is shown, and the circuit connection diagram of each other group of insulator sheets is the same as the above. Specifically, a porcelain insulator zero value detection auxiliary device includes: each insulator sheet is connected to both ends of an insulation resistance meter 5 after being connected in parallel; two insulator sheets form a group, and each group of insulator sheets is connected in parallel and sequentially connected to a current sampling circuit 1, a comparison circuit 2 and a light alarm circuit 3, and the output end of each comparison circuit 2 is connected to a sound alarm circuit 6, and the current sampling circuit 1, the comparison circuit 2, the light alarm circuit 3 and the sound alarm circuit 6 are all connected to a power module 4.

[0022] The porcelain insulator zero value detection auxiliary device also includes a current display module, which includes an ammeter. One end of each ammeter is connected to the ground terminal of the insulation resistance meter 5, and each group of insulator sheets is electrically connected to the other end of the corresponding ammeter after being connected in parallel.

[0023] The power module 4 includes a device switch, a DC input terminal and a rechargeable battery connected in series; the DC input terminal provides a 12V DC voltage, and the rechargeable battery outputs a 5V voltage.

[0024] The sound and light alarm is mainly as follows: the light alarm circuit 3 includes a light emitting diode. When the current value in the current sampling circuit 1 is higher than the set threshold value in the comparison circuit 2, the comparison circuit 2 outputs a high level, and the light emitting diodes (LED01, LED02) connected to the output end of the comparison circuit 2 are turned on. The sound alarm circuit 6 includes a diode (D01, D305) and a buzzer SFM-27. When the current value in any current sampling circuit 1 is higher than the set threshold value in the corresponding comparison circuit 2, the corresponding comparison circuit 2 outputs a high level, and the diodes (D01, D305) connected to the output end of the corresponding comparison circuit 2 are turned on, driving the buzzer SFM-27.

[0025] The device is a box, and a current sampling circuit 1, a comparison circuit 2, a light alarm circuit 3, an acoustic alarm circuit 6, and a power module 4 are arranged inside the box; the upper surface of the box is a device panel, and the device panel is made of an epoxy resin board. The device switch SW01, the terminals inserted after each group of insulator pieces are connected in parallel, the terminals inserted at both ends of each group of insulator pieces, the grounding terminals, the L terminals and E terminals connected to the insulation resistance meter 5, and the light-emitting diodes (LED01, LED02) are arranged on the device panel; a buzzer SFM-27 is arranged on the side of the box. The terminals inserted after each group of insulator pieces are connected in parallel, the terminals inserted at both ends of each group of insulator pieces, the grounding terminals, and the L terminals and E terminals connected to the insulation resistance meter 5 are pure copper terminals.

[0026] The structure and use method of the porcelain insulator string zero value detection auxiliary device in the embodiment of the present invention are described in detail below.

[0027] See also Figure 1 and Figure 2 As shown, Figure 2 There is only one detection circuit under one group of insulator slices, and it has a unique sound alarm circuit 6 for the entire device. In the figure, RL1-RL26 are 26 insulator slices. In the porcelain insulator string zero value detection auxiliary device in the embodiment of the present invention, every two insulator slices are connected in parallel to the current sampling circuit 1, the comparison circuit 2 and the light alarm circuit 3, all the insulator slices are connected in parallel to the circuit, and then the output end of the comparison circuit 2 under each group of insulator slices is connected to the same sound alarm circuit 6; wherein, there are many ways to implement the current sampling circuit 1 and the comparison circuit 2, which are not limited to the methods in the attached drawings of the present invention.

[0028] After applying 5kV test voltage to both ends of the insulation resistance meter 5L and E, the insulation resistance value of each group of insulator pieces is greater than 500MΩ, that is, when the current is less than 10μA, the comparison circuit 2 does not work, and the light alarm circuit 3 and the sound alarm circuit 6 are not conducting; if there is one insulator piece in each group that is less than 500MΩ, that is, when the current is greater than 10μA, the comparison circuit 2 works and outputs a high level, the corresponding light alarm circuit 3 emits a light alarm, and the buzzer SFM-27 in the sound alarm circuit 6 emits a sound; because each parallel branch measures the signal of each group of two insulator pieces, when zero or low value insulators are detected, only the two insulators need to be measured separately, which greatly reduces the measurement time and narrows the measurement range. In addition, the insulation resistance meter 5 only adds voltage once, which greatly reduces the duration of the overall detection.

[0029] See also Figure 3 As shown, Figure 3 Only some insulator pieces are drawn in the figure. The porcelain insulator string zero value detection auxiliary device in this embodiment uses a parallel circuit to connect all the insulator pieces in parallel. The same voltage is applied to each insulator. After every two insulator pieces are connected in parallel, an ammeter is connected in series, so that the leakage current of the insulator pieces can be measured and displayed.

[0030] The power supply module 4 adopts a DC circuit module to provide DC power for the current sampling circuit 1 , the comparison circuit 2 , the light alarm circuit 3 and the sound alarm circuit 6 .

[0031] The current setting threshold of the comparison circuit 2 is 10μA. When the signal current is greater than 10μA, the comparison circuit 2 outputs a high level, so that the light-emitting diode in the light alarm circuit 3 is turned on, and the diode (D01, D305) in series with the buzzer SFM-27 in the sound alarm circuit 6 is turned on. When the insulation resistance of a group of insulator slices is zero or low, the light-emitting diode (LED01, LED02) in the corresponding group of circuits is lit. Regardless of which group of insulator slices has zero or low insulator resistance, the buzzer SFM-27 of the sound alarm circuit 6 will sound.

[0032] When in use, a special test line for the insulation resistance meter 5 is used, and both ends of each insulator are connected in parallel into the circuit, and the connection between the two insulator pieces is inserted into the terminal inserted after each group of insulator pieces are connected in parallel, and the two ends of the two insulator pieces are inserted into the terminal inserted at both ends of each group of insulator pieces, and the ground wire is inserted into the above-mentioned grounding terminal, and the output connection (L connection and E connection) of the insulation resistance meter 5 is connected to the L terminal and E terminal of the insulation resistance meter 5 of the porcelain insulator string zero value detection auxiliary device in the embodiment of the present invention; after all the connections are connected, turn on the device switch SW01 of the auxiliary device, and turn on the switch of the insulation resistance meter 5, apply a voltage of 5kV, and observe the luminescence Check whether the diode (LED01, LED02) and the buzzer SFM-27 are working, and whether the insulation resistance value of the insulation resistance meter 5 is qualified. If a certain light-emitting diode (LED01, LED02) is lit, the buzzer SFM-27 makes a sound, and the insulation resistance value displayed in the insulation resistance meter 5 is unqualified, the corresponding two insulator sheets can be measured separately through the position displayed by the auxiliary device light-emitting diode (LED01, LED02). If the light-emitting diode (LED01, LED02) and the buzzer SFM-27 do not work, and the insulation resistance meter 5 displays normal, the zero value detection of the porcelain insulator string is completed and marked as normal.

[0033] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A porcelain insulator string zero value detection auxiliary device, characterized in that: include: Each insulator sheet is connected in parallel to the two ends of the insulation resistance meter; two insulator sheets form a group, and each group of insulator sheets is connected in parallel and sequentially connected to the current sampling circuit, the comparison circuit and the light alarm circuit, the output end of each comparison circuit is connected to the sound alarm circuit, and the current sampling circuit, the comparison circuit, the light alarm circuit and the sound alarm circuit are all connected to the power module; it also includes a current display module, the current display module includes an ammeter, one end of each ammeter is connected to the ground terminal of the insulation resistance meter, and each group of insulator sheets is electrically connected to the other end of the corresponding ammeter after being connected in parallel; the power module includes a device switch, a DC input end and a rechargeable battery connected in series; the DC input end provides a 12V DC voltage, and the rechargeable battery outputs a 5V voltage.

2. The porcelain insulator string zero value detection auxiliary device according to claim 1, characterized in that: The light alarm circuit includes a light emitting diode. When the current value in the current sampling circuit is higher than the set threshold value in the comparison circuit, the comparison circuit outputs a high level and the light emitting diode connected to the output end of the comparison circuit is turned on.

3. The porcelain insulator string zero value detection auxiliary device according to claim 1, characterized in that: The sound alarm circuit includes a diode and a buzzer. When the current value in any current sampling circuit is higher than the set threshold value in the corresponding comparison circuit, the corresponding comparison circuit outputs a high level, and the diode connected to the output end of the corresponding comparison circuit is turned on to drive the buzzer.

4. The porcelain insulator string zero value detection auxiliary device according to claim 2 or 3, characterized in that: The device is a box, inside which are arranged a current sampling circuit, a comparison circuit, a light alarm circuit, an acoustic alarm circuit and a power module; the upper surface of the box is a device panel, on which are arranged a device switch, a terminal inserted after each group of insulator pieces are connected in parallel, a terminal inserted at both ends of each group of insulator pieces, a grounding terminal, an L terminal and an E terminal connected to an insulation resistance meter, and a light-emitting diode; a buzzer is arranged on the side of the box.

5. The porcelain insulator string zero value detection auxiliary device according to claim 4, characterized in that: The panel of the device is made of epoxy resin board.

6. The porcelain insulator string zero value detection auxiliary device according to claim 4, characterized in that: The terminals inserted after each set of insulator segments are connected in parallel, the terminals inserted at both ends of each set of insulator segments, the grounding terminals, and the L terminals and E terminals connected to the insulation resistance meter are pure copper terminals.

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