CN205301424U - Exchange double circuit transmission line induced voltage measuring device - Google Patents

Abstract

The utility model relates to a device for measuring induced voltage of an AC double-circuit power transmission line on the same tower, which comprises an operating rod, a single-chip microcomputer, a selection switch, an amplification circuit, a window voltage comparator and a measurement sensor. The single-chip microcomputer is connected with the measurement sensor and the selection switch respectively. The amplifying circuit is connected to the selection switch and the window voltage comparator respectively, the measurement sensor is located at one end of the operating rod, and the other end of the operating rod has a handle, and the handle is provided with a non-slip part. The measuring device of the utility model can effectively solve the problem that the induced voltage of an AC transmission line with a voltage level of 500kV and above cannot be measured, and improves the safety of maintenance operations.

Description

A device for measuring induced voltage of AC double-circuit transmission line on the same tower

technical field

The utility model relates to the field of measuring devices, in particular to a device for measuring induced voltage of an AC double-circuit transmission line on the same tower.

Background technique

AC double-circuit transmission lines on the same tower, one circuit is charged and the other circuit is powered off. Induced voltage is likely to appear in the circuit during power failure circuit maintenance. The electromagnetic induction voltage of 500kV voltage level can reach 6kV, and the induced voltage of 500kV and above voltage level is even higher. There is no induced voltage testing method during the maintenance operation, and there is no ready-made induced voltage measuring device for use. Therefore, the utility model patent uses the direct measurement method to measure the voltage range of the induced voltage, thereby judging whether there is an induced voltage in the power failure line, and successfully developed A device for measuring induced voltage was introduced, which effectively solved the technical problem that the induced voltage could not be measured in double-circuits on the same AC tower. At present, my country's transmission lines basically use contact electroscopes for electric inspections, and there are relevant standards (IEC61243-1 "Live Working Electroscopes for Capacitive Electroscopes with AC Voltages of 1kV and Above", DL740-2000 "Capacitive Electroscopes") Electrical Appliances") regulates the design, manufacture, operation guidelines and test methods of contact electroscopes. The contact electroscope is in direct contact with the line, and the transistor is turned on through the comprehensive operation of voltage division and leakage current to generate a live alarm. Each type of electroscope can only be used at the corresponding voltage level, and the contact electroscope is only suitable for 500kV and the following voltage levels. Because the induced voltage is affected by relatively large factors and its size is not fixed, the electrometry technology used for 500kV and below cannot meet the measurement requirements of induced voltage. Generally, the voltage distribution of the normal insulator string is incomplete saddle shape. If there is a bad insulator, the voltage on the insulator string will be redistributed. The obtained voltage distribution is compared with the normal voltage distribution on the insulator string, which can be used to judge whether there is a bad insulator. For example, manual climbing methods such as short-circuit forks, spark gap discharge forks, or insulator string voltage analyzers can grasp the insulation status of insulators by detecting changes in the voltage value of the insulators. This traditional insulator detection method is currently widely used in various power supply units, but it has the disadvantages of high labor intensity, poor safety, low efficiency, and electromagnetic interference, which is easy to cause false detection or missed detection. The induced voltage is much lower than the normal operating voltage, and the device used for insulator string defect detection cannot detect the double-loop induced voltage on the same tower. The existing technology is only applicable to the voltage level of 500kV and below, and can only measure one-to-one voltage level, the measurement accuracy is low, and the measurement cannot be completed when the voltage is relatively low.

Contents of the invention

In view of the above-mentioned deficiencies in the prior art, the utility model provides a device for measuring the induced voltage of an AC double-circuit transmission line on the same tower, which can measure the induced voltage of the AC double-circuit transmission line on the same tower.

In order to achieve the above object, the utility model adopts the following technical solutions:

A device for measuring induced voltage of an AC double-circuit transmission line on the same tower, comprising an operating lever, a single-chip microcomputer, a selection switch, an amplifier circuit, a window voltage comparator, and a measurement sensor, the single-chip microcomputer is respectively connected to the measurement sensor and the selection switch, and the The amplifying circuit is respectively connected with the selection switch and the window voltage comparator, the measuring sensor is located at one end of the operating rod, and the other end of the operating rod has a handle, and the handle is provided with an anti-slip component.

As a preferred technical solution of the present invention, the model of the single-chip microcomputer is stc89s52, and the model of the selector switch is CD4052.

As a preferred technical solution of the utility model, the operating rod is a telescopic rod.

As a preferred technical solution of the present utility model, the operating rod includes a telescopic component, a first telescopic rod and a second telescopic rod, and the first telescopic rod and the second telescopic rod are stretched and contracted by the telescopic component.

As a preferred technical solution of the present invention, the anti-slip component is a bump.

As a preferred technical solution of the present invention, a display device is also included, and the display device is located on the first telescopic rod and connected to the window voltage comparator.

As a preferred technical solution of the utility model, the single-chip microcomputer has three ports and is connected to the address terminal of the selection switch.

The utility model relates to a device for measuring induced voltage of an AC double-circuit transmission line on the same tower, comprising an operating lever, a single-chip microcomputer, a selection switch, an amplifying circuit, a window voltage comparator and a measurement sensor, and the single-chip microcomputer is connected with the measurement sensor and the selection switch respectively. connected, the amplifying circuit is respectively connected with the selection switch and the window voltage comparator, the measurement sensor is located at one end of the operating rod, and the other end of the operating rod has a handle, and the handle is provided with a non-slip Parts, the utility model compares the induced voltage with the window voltage to determine the size range of the induced voltage, which can effectively solve the problem that the induced voltage cannot be measured because the size is not fixed. The lowest measurable voltage is 200V, and the highest measurable line operating voltage (AC 500kV and above). If the induced voltage is X and the line voltage is A, the acousto-optic frequency is determined according to the comparison results of the two, which is convenient for maintenance personnel to judge the danger level.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the utility model more clearly, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the utility model , for those skilled in the art, other drawings can also be obtained according to these drawings on the premise of not paying creative work.

Fig. 1 is a structural schematic diagram of a device for measuring induced voltage of an AC double-circuit transmission line on the same tower according to the utility model.

Fig. 2 is a connection block diagram of a device for measuring induced voltage of an AC double-circuit transmission line on the same tower according to the utility model.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

As shown in Fig. 1 and Fig. 2, the utility model provides a kind of induction voltage measuring device of AC double-circuit transmission line on the same tower, including an operating lever 1, a single-chip microcomputer 2, a selection switch 3, an amplifying circuit 5, a window voltage comparator 6 and a measuring sensor 7 , the single-chip microcomputer 2 is connected to the measurement sensor 7 and the selection switch 3 respectively, and the amplifying circuit 5 is connected to the selection switch 3 and the window voltage comparator 6 respectively, and the measurement sensor 7 is located on the side of the operating rod 1 One end, the other end of the operating rod 1 has a handle portion, and the handle portion is provided with an anti-slip component 8 .

In the utility model, the measurement sensor 7 is used to measure the line induced voltage, and transmits the measurement result to the single-chip microcomputer 2, and the single-chip microcomputer 2 inputs the voltage signal to the amplifying circuit 5 through the selection switch 3, and the amplified signal is input to the window The voltage comparator 6 can further realize the measurement of the induced voltage. By comparing the induced voltage in the window voltage comparator 6, the size range of the induced voltage is determined, which can effectively solve the problem that the induced voltage cannot be measured because the magnitude is not fixed. The lowest measurable voltage is 200V, and the highest measurable line operating voltage (AC 500kV and above). The induced voltage measurement sensor 7 in contact with the wire divides the line voltage and then inputs it to the window voltage comparator 6. According to the magnitude of the induced voltage, it gives an alarm with sound and light at different frequencies. For example, if the induced voltage is X, the line voltage is A. Determine the frequency of sound and light according to the comparison results of the two, which is convenient for maintenance personnel to judge the danger level.

If X=A, the sound and light frequency is 25Hz

If X<A/100 the sound and light frequency is 10Hz

If X<A/500, the sound and light frequency is 2Hz

If X=0, there is no sound and light response

The utility model aims at the induced voltage characteristics of 500kV AC and above double-circuit lines on the same tower, adopts the window voltage comparison method to determine the voltage range, and develops an induced voltage measuring device. The device can effectively solve the problem that the induced voltage of the AC transmission line with a voltage level of 500kV and above cannot be measured, and improves the safety of maintenance operations.

In this embodiment, the model of the single-chip microcomputer 2 is stc89s52, and the model of the selector switch 3 is CD4052. Specifically, the three ports provided in the single-chip microcomputer 2 are connected to the address terminals of the selector switch 3CD4052 for selecting different voltage signal inputs. To the amplification circuit 5, the amplified signal is input to the window voltage comparator 6.

In this embodiment, the operating rod 1 is a telescopic rod. Further, the operating rod 1 includes a telescopic part, a first telescopic rod and a second telescopic rod. For better operability, extend the insulating operating rod section by section, so that the induced voltage measuring device is gradually approached to the wire. If the wire does not discharge the measuring device, the induced voltage measuring device will completely touch the line.

In this embodiment, the anti-slip component 8 is a bump, which can play an anti-slip effect.

In this embodiment, a display device 4 is also included. The display device 4 is located on the first telescopic rod and connected to the window voltage comparator 6 , so that the test data can be displayed on the display device 4 .

In the utility model, before operation, the function of the window voltage comparator is verified, and after the function verification switch is pressed, the sample selection switch outputs voltage signals of different sizes sequentially under the control of the single-chip microcomputer, which are amplified and then input to the window voltage comparator , if it can respond sequentially to input voltage signals of different sizes, the whole function is normal.

To sum up, a kind of induction voltage measuring device of the AC double-circuit transmission line on the same tower of the present invention includes an operating rod, a single-chip microcomputer, a selection switch, an amplifying circuit, a window voltage comparator and a measuring sensor, and the single-chip microcomputer is connected with the said single-chip microcomputer respectively. The measurement sensor is connected to the selection switch, and the amplifying circuit is connected to the selection switch and the window voltage comparator respectively. The measurement sensor is located at one end of the operation rod, and the other end of the operation rod has a handle, and Anti-slip parts are provided on the upper part, and threaded adjustment parts are respectively located on both sides of the bearing, and the fixed ring is connected with the threaded adjustment parts. The utility model determines the size range of the induced voltage by comparing the induced voltage with the window voltage, and can effectively solve the problem that the induced voltage cannot be measured because the size is not fixed. The lowest measurable voltage is 200V, and the highest measurable line operating voltage (AC 500kV and above). If the induced voltage is X and the line voltage is A, the sound and light frequency can be determined according to the comparison results of the two, which is convenient for maintenance personnel to judge the danger level.

The above is only a specific embodiment of the utility model, but the scope of protection of the utility model is not limited thereto, and any skilled person familiar with the technology in the art can easily think of changes within the technical scope disclosed in the utility model Or replacement, all should be covered within the scope of protection of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (7)

1. an exchange same tower double back transmission line induced voltage measurement apparatus, it is characterized in that, including action bars, single-chip microcomputer, selection switch, amplifying circuit, window voltage comparator and measurement sensor, described single-chip microcomputer is connected with described measurement sensor and selection switch respectively, described amplifying circuit selects switch and window voltage comparator to be connected with described respectively, described measurement sensor is positioned at one end of described action bars, the described action bars other end has a Handheld Division, and described Handheld Division is provided with slip-proofing device.

2. a kind of exchange same tower double back transmission line induced voltage measurement apparatus according to claim 1, it is characterised in that described single-chip microcomputer model is stc89s52, and the model of described selection switch is CD4052.

3. a kind of exchange same tower double back transmission line induced voltage measurement apparatus according to claim 1, it is characterised in that described action bars is expansion link.

4. according to the arbitrary described one exchange same tower double back transmission line induced voltage measurement apparatus of claim 1-3, it is characterized in that, described action bars includes extensible member, the first expansion link and the second expansion link, and described first expansion link, the second expansion link are stretched by extensible member.

5. a kind of exchange same tower double back transmission line induced voltage measurement apparatus according to claim 4, it is characterised in that described slip-proofing device is salient point.

6. a kind of exchange same tower double back transmission line induced voltage measurement apparatus according to claim 4, it is characterised in that also including display device, described display device is positioned on described first expansion link and is connected with described window voltage comparator.

7. a kind of exchange same tower double back transmission line induced voltage measurement apparatus according to claim 4, it is characterised in that described single-chip microcomputer has three ports and is connected with the described address end selecting switch.