Pulse capacitance conversion device for cable fault location power supply

Abstract

The application relates to a pulse capacitance conversion device of a cable fault positioning power supply, which comprises a fixed support, a movable disc, a first capacitor and a second capacitor, the fixed support is sequentially provided with a first static contact, a second static contact, a third static contact, a fourth static contact, a fifth static contact and a sixth static contact; the first static contact is connected with the first capacitor and the second capacitor respectively, the first capacitor is further connected with the fourth static contact, and the second capacitor is connected with the third static contact and the ground respectively; the fifth static contact and the sixth static contact are connected with a capacitor output line for output; the movable disc is provided with a plurality of movable contacts corresponding to the static contacts, two movable contacts corresponding to the first movable contact and the sixth movable contact are mutually conductive, and two movable contacts corresponding to the third movable contact and the fourth movable contact are mutually conductive. Compared with the prior art, the application can output larger discharge energy when the positioning power supply outputs low voltage, and effectively improves the positioning effect of the acoustic-magnetic synchronous method for cable low-resistance faults.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fault location power supply, in particular to a pulse capacitor conversion device of a cable fault location power supply. BACKGROUND

[0002] The underground cable is divided into medium voltage, high voltage and extra high voltage cables according to voltage levels, and the commonly used voltage levels are 380V, 6kV, 10kV, 35kV, 66kV, 110kV, 220kV and 500kV. The main insulation thickness of these cables is generally between one millimeter and more than twenty millimeters. After being damaged by external force or aging, the residual voltage is generally below 30kV. After the underground cable fails, two steps of fault pre-location and accurate pinpointing are generally required. After the fault location is determined, the target cable is excavated, and finally the fault point is confirmed and repaired.

[0003] The most effective method for accurate pinpointing of faults is the acoustic-magnetic synchronous method. The key of this method is the size of the discharge sound at the fault point (the positioning power supply applies a high-voltage pulse to the fault cable, and the discharge of the fault point produces vibration to the surrounding medium. The acceleration sensor of the detection instrument above the cable path converts the vibration signal into a voltage signal, and then the voltage signal is converted into a sound signal that can be heard by the human ear). The discharge sound at the fault point is related to the nature of the fault and the discharge energy of the positioning power supply, and the discharge energy is proportional to the output voltage of the positioning power supply and the capacity of the pulse capacitor (Q=U 2 C / 2). Currently, the positioning power supply generally uses a pulse capacitor with a fixed capacity, and can only increase the output discharge energy by increasing the output voltage. However, for 380V and 6kV cables, the output voltage of the power supply cannot exceed the specified voltage. For high-voltage cables with low resistance faults, increasing the output voltage has little effect. Therefore, the existing positioning power supply cannot output large discharge energy at low output voltage, resulting in small discharge sound at the fault point, poor pinpointing effect, and low fault finding efficiency. SUMMARY

[0004] The purpose of the present application is to overcome the defects of the existing positioning power supply that cannot output large discharge energy at low output voltage, and to provide a pulse capacitor conversion device of a cable fault location power supply.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] A pulse capacitor conversion device of a cable fault location power supply, comprising a fixed support, a rotating disc, a first capacitor and a second capacitor,

[0007] The fixed support is provided with a plurality of static contacts, and the plurality of static contacts comprises first, second, third, fourth, fifth and sixth static contacts arranged in sequence.

[0008] The first static contact is divided into a first branch and a second branch to connect the first capacitor and the second capacitor respectively, the first capacitor is further connected to the fourth static contact, and the second capacitor is connected to the third static contact and the ground respectively; the fifth static contact and the sixth static contact are connected to the output line of the capacitor respectively, and the output line of the capacitor is connected to the cable fault positioning power supply;

[0009] The moving rotary disc is provided with a plurality of moving contacts corresponding to each static contact, and the plurality of moving contacts include a first moving contact, a second moving contact, a third moving contact, a fourth moving contact, a fifth moving contact and a sixth moving contact, the first moving contact and the sixth moving contact are connected to each other in conduction, and the third moving contact and the fourth moving contact are connected to each other in conduction; the moving rotary disc is rotatably connected to the fixed support.

[0010] Further, when the pulse capacitor conversion device is in a first state, the first moving contact is connected to the first static contact, so as to make the first capacitor and the second capacitor parallel, and improve the total capacity of the capacitor output;

[0011] When the pulse capacitor conversion device is in a second state, the first moving contact is connected to the second static contact, so as to make the first capacitor and the second capacitor series, and reduce the total capacity of the capacitor output.

[0012] Further, the moving rotary disc includes a moving contact fixed disc and a center shaft, the center shaft is fixed on the moving contact fixed disc, and each moving contact is fixed on the moving contact fixed disc;

[0013] The fixed support includes a fixed support bottom plate and a fixed support partition plate, the periphery of the fixed support bottom plate is connected to the fixed support partition plate through a plurality of fixed support struts, and each static contact is fixed on the fixed support bottom plate; the fixed support bottom plate and the fixed support partition plate are both provided with a positioning hole for the center shaft to extend into.

[0014] Further, the fixed support bottom plate is further provided with a limiting groove, the moving contact fixed disc is fixed with a limiting guide rod, the limiting guide rod is located in the limiting groove, and the moving range of the limiting guide rod in the limiting groove satisfies the switching connection between the first moving contact and the first static contact and the second static contact.

[0015] Further, one end of the center shaft away from the fixed support is provided with a state detection pressing sheet fixed metal ring and a state detection pressing sheet, the state detection pressing sheet is fixed on the state detection pressing sheet fixed metal ring, and the state detection pressing sheet fixed metal ring is fixed on the center shaft through a locking nut.

[0016] Further, the center shaft comprises a center shaft upper half and a center shaft lower half, the center shaft lower half is located between the fixed support base plate and the fixed support partition plate, the outermost diameter of the center shaft lower half is larger than the outermost diameter of the center shaft upper half, and the center shaft lower half is provided with a center shaft pressure spring at one end close to the fixed support partition plate, and the other end of the center shaft pressure spring is connected to the fixed support partition plate.

[0017] Further, the moving contact fixed disc is provided with a plurality of moving contact fixed grooves at the side close to the fixed support base plate, and each moving contact is fixed in the moving contact fixed groove through a moving contact spring.

[0018] Further, the fixed support base plate is provided with an insulating layer between two adjacent stationary contacts, the surface of the stationary contact is a spherical structure, and the bottom of the stationary contact is connected to the fixed support base plate through a thread.

[0019] Further, the fixed support is further provided with a first micro switch and a second micro switch, the first micro switch is connected to the power supply circuit of the cable fault positioning power supply, and the second micro switch is connected to the capacitor output line.

[0020] Further, the moving contact fixed disc is provided with a locking pin mounting hole for mounting a locking pin to fixedly connect the moving disc and the fixed support.

[0021] Compared with the prior art, the present application has the following advantages:

[0022] (1) The present application realizes the two position output states of the conversion device through the cooperation of the fixed support and the moving disc through the limiting groove and the limiting guide rod, realizes the series or parallel connection function of the high-voltage pulse capacitor, makes the capacitance four times as high as the low voltage, and ensures that the maximum discharge energy is the same under two voltage gears. Therefore, the internal pulse capacitor conversion device of the cable fault positioning power supply can realize the output of larger discharge energy when the positioning power supply is in low voltage output, effectively improves the acoustic-magnetic synchronous method positioning effect of low-resistance faults of medium-low voltage cables and high-voltage cables, and has good market application value.

[0023] (2) The moving disc and the fixed support of the present application rely on the spring force to ensure reliable contact between the moving contact and the stationary contact.

[0024] (3) The present application has the working state detection function and the on-off control function of the power frequency power supply, and is safe and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The structure diagram of the pulse capacitor conversion device of the cable fault positioning power supply provided in the embodiment of the present application is shown in the figure.

[0026] Figure 2A structural schematic view of a fixed support provided in an embodiment of the present application;

[0027] Figure 3 A structural schematic view of a moving turntable provided in an embodiment of the present application;

[0028] Figure 4 A use state wiring schematic view of a first state position of a pulse-capacitance conversion device of a cable fault positioning power supply provided in an embodiment of the present application;

[0029] Figure 5 A use state wiring schematic view of a second state position of a pulse-capacitance conversion device of a cable fault positioning power supply provided in an embodiment of the present application;

[0030] In the figure, 1, fixed support, 101, fixed support bottom plate, 102, bottom plate center positioning hole, 103, limiting groove, 104, anti-climbing groove, 105, static contact, 106, fixed support lower support column, 107, fixed support partition plate, 108, fixed support upper support column, 109, micro switch mounting piece, 110, first micro switch, 111, partition plate center positioning hole, 2, moving turntable, 201, moving contact fixed disc, 202, moving contact spring, 203, moving contact, 204, conducting wire, 205, limiting guide rod, 206, locking pin mounting hole, 207, moving contact fixed disc cover, 208, center shaft lower half, 209, center shaft pressure spring, 210, center shaft upper half, 211, state detection pressure piece, 212, state detection pressure piece fixed metal ring. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts are within the scope of protection of the present application.

[0033] It should be noted that: similar numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0034] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed during use, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] It should be noted that the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can include one or more of the features explicitly or implicitly. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0036] In addition, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0037] Embodiment 1

[0038] As shown in Figure 1 The present embodiment provides a pulse capacitance conversion device of a cable fault location power supply, comprising a fixed support 1, a movable turntable 2, a first capacitor and a second capacitor,

[0039] The fixed support 1 is provided with a plurality of static contacts 105, and the plurality of static contacts 105 include a first static contact, a second static contact, a third static contact, a fourth static contact, a fifth static contact and a sixth static contact arranged in sequence;

[0040] The first static contact is divided into a first branch and a second branch to connect the first capacitor and the second capacitor respectively, the first capacitor is further connected to the fourth static contact, and the second capacitor is connected to the third static contact and the ground respectively; the fifth static contact and the sixth static contact are connected to the output line through the capacitor output line, and the capacitor output line is connected to the cable fault location power supply;

[0041] The movable turntable 2 is provided with a plurality of movable contacts 203 corresponding to each static contact 105, and the plurality of movable contacts 203 include a first movable contact, a second movable contact, a third movable contact, a fourth movable contact, a fifth movable contact and a sixth movable contact, the first movable contact and the sixth movable contact are connected to each other, and the third movable contact and the fourth movable contact are connected to each other; the movable turntable 2 is rotatably connected to the fixed support 1.

[0042] Working principle:

[0043] When the pulse capacitor conversion device is in the first state, the first moving contact is connected to the first stationary contact, which is used to make the first capacitor and the second capacitor connected in parallel to increase the total output capacity of the capacitor.

[0044] When the pulse capacitor conversion device is in the second state, the first moving contact is connected to the second stationary contact to connect the first capacitor and the second capacitor in series, thereby reducing the total output capacitance.

[0045] This allows for the series or parallel connection of two high-voltage pulse capacitors, ensuring that the capacitance is four times that of the high-voltage capacitor at low voltage, thus guaranteeing the same maximum discharge energy at both voltage levels. Therefore, this internal pulse capacitor conversion device for cable fault location power supplies enables the power supply to output significant discharge energy even at low voltage, effectively improving the acoustic-magnetic synchronization location effect for low-resistance faults in medium- and low-voltage cables and high-voltage cables, and possesses significant market application value.

[0046] In this embodiment, the movable turntable 2 includes a movable contact fixing disk 201 and a central shaft. The central shaft is fixed on the movable contact fixing disk 201, and each movable contact is fixed on the movable contact fixing disk 201.

[0047] The fixed bracket 1 includes a fixed bracket base plate 101 and a fixed bracket partition plate 107. The fixed bracket base plate 101 is connected to the fixed bracket partition plate 107 around its perimeter by multiple fixed bracket pillars. Each stationary contact point 105 is fixed on the fixed bracket base plate 101. Both the fixed bracket base plate 101 and the fixed bracket partition plate 107 are provided with positioning holes for the central shaft to extend into.

[0048] like Figure 2 As shown, in this embodiment, the base plate 101 of the fixed bracket is provided with a center positioning hole 102, the partition plate 107 of the fixed bracket is provided with a center positioning hole 111, and each static contact point 105 is evenly distributed with the center positioning hole 102 of the base plate as the center; the support column of the fixed bracket includes the upper support column 108 of the fixed bracket and the lower support column 106 of the fixed bracket.

[0049] In a preferred embodiment, the fixed bracket base plate 101 is further provided with a limiting groove 103. The moving contact fixing plate 201 is fixed with a limiting guide rod 205. The limiting guide rod 205 is located in the limiting groove 103. The movement range of the limiting guide rod 205 in the limiting groove 103 is sufficient to allow the first moving contact to switch between the first stationary contact and the second stationary contact. Optionally, the limiting groove 103 is a groove with an arc angle of 60 degrees.

[0050] When the movable rotating disc 2 is lifted and rotated, the movable rotating disc 2 can only switch between two positions within the limiting groove 103 by a certain angle, so as to realize series or parallel output of two high-voltage pulse capacitors. Moreover, after the rotating disc is completely lifted upward, more than half of the length of the guide rod is located within the limiting groove 103, so as to ensure that the movable rotating disc 2 can only rotate within this range.

[0051] As a preferred embodiment, the end of the central shaft away from the fixed support 1 is provided with a state detection pressing sheet fixing metal ring 212 and a state detection pressing sheet 211, the state detection pressing sheet 211 is fixed on the state detection pressing sheet fixing metal ring 212, and the state detection pressing sheet fixing metal ring 212 is fixed on the central shaft through a locking nut.

[0052] The state detection pressing sheet 211 can intuitively display the working state of the pulse capacitor conversion device.

[0053] As a preferred embodiment, the central shaft comprises a central shaft upper half portion 210 and a central shaft lower half portion 208, the central shaft lower half portion 208 is located between the fixed support bottom plate 101 and the fixed support partition plate 107, the outermost diameter of the central shaft lower half portion 208 is greater than the outermost diameter of the central shaft upper half portion 210, and the end of the central shaft lower half portion 208 close to the fixed support partition plate 107 is provided with a central shaft pressure spring 209, and the other end of the central shaft pressure spring 209 is connected to the fixed support partition plate 107.

[0054] The side of the movable contact fixed disc 201 close to the fixed support bottom plate 101 is provided with a plurality of movable contact fixing grooves, and each movable contact is fixed in the movable contact fixing groove through a movable contact spring 202.

[0055] The central shaft pressure spring 209 can ensure reliable contact between the movable rotating disc 2 contact and the fixed support bottom plate 101 static contact 105 by the elastic force; and the movable contact spring 202 arranged in the movable contact fixing groove can further improve the reliability of the mutual contact of the contacts.

[0056] As shown in Figure 3 the movable rotating disc 2 is assembled into an integral structure, and a conducting wire 204 is arranged between part of the movable contacts, in this embodiment, the limiting guide rod 205 is installed at the bottom of the movable contact fixed disc 201, the movable contact fixed disc 201 is provided with a movable contact fixed disc cover 207 above, the central shaft lower half portion 208 is made of insulating material and has an internal threaded hole, and the central shaft pressure spring 209 is pressed by the fixed support partition plate 107; the central shaft upper half portion 210 is made of metal material, the bottom is an external threaded structure, and can be screwed and installed with the central shaft lower half portion 208.

[0057] As a preferred embodiment, the fixed support base plate 101 is provided with an insulating anti-creep groove 104 between two adjacent static contacts 105, and the surface of the static contact 105 is in a spherical structure, and the bottom of the static contact 105 is fixed to the fixed support base plate 101 through a threaded connection.

[0058] Overall, the fixed support 1 is fixed by four insulating support columns, and the base plate is uniformly fixed with contacts on the circumference, and the anti-creep groove 104 is engraved between the contacts to enhance the insulation between the contacts, the surface of the contact is in a spherical structure to prevent sharp end discharge, and the bottom of the contact is an internal threaded hole for convenient wiring.

[0059] As a preferred embodiment, the fixed support 1 is further provided with a first micro switch 110 and a second micro switch 110, the first micro switch 110 is connected to the power supply circuit of the cable fault positioning power supply, and the second micro switch 110 is connected to the capacitor output line.

[0060] Two micro switches 110 for detecting the state, one for controlling the power frequency power supply voltage, and the other for controlling the output high voltage control after the capacitor gear shifting, and each micro switch 110 is installed on the fixed support partition plate 107 through the micro switch mounting sheet 109.

[0061] As a preferred embodiment, the moving contact fixing disc 201 is provided with a locking pin mounting hole 206 for mounting a locking pin to fixedly connect the moving disc 2 and the fixed support 1, and the moving disc 2 can be reliably fixed in each working state.

[0062] Figure 4 And Figure 5 The wiring diagrams for the first position and the second position of the conversion device are shown in the figure, and the capacitances of the capacitors C1 and C2 are both C. Figure 4 And 5 The dashed line is the position of the contact wiring of the moving disc 2. Figure 4 The wiring realizes the series connection of two capacitors, and the total capacity of the capacitor output is C / 2; Figure 5 The wiring realizes the parallel connection of two capacitors, and the total capacity of the capacitor output is 2C.

[0063] The above describes the preferred embodiments of the present application in detail. It should be understood that those skilled in the art can make many modifications and changes without creative labor according to the concept of the present application. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment based on the prior art according to the concept of the present application shall be within the protection scope determined by the claims.

Claims

1. A pulse capacitance conversion device for a power supply for cable fault location, characterized by, It comprises a fixed support (1), a dynamic rotating disc (2), a first capacitor and a second capacitor, The fixed support (1) is provided with a plurality of static contacts (105), which comprise a first static contact, a second static contact, a third static contact, a fourth static contact, a fifth static contact and a sixth static contact arranged in sequence. The first static contact is divided into two branches to be connected with the first capacitor and the second capacitor respectively, the first capacitor is further connected with the fourth static contact, and the second capacitor is connected with the third static contact and the ground respectively; the fifth static contact and the sixth static contact are connected with a capacitor output line in sequence and then output, and the capacitor output line is connected with a cable fault locating power supply. The dynamic rotating disc (2) is provided with a plurality of dynamic contacts (203) corresponding to the static contacts (105), which comprise a first dynamic contact, a second dynamic contact, a third dynamic contact, a fourth dynamic contact, a fifth dynamic contact and a sixth dynamic contact, the first dynamic contact and the sixth dynamic contact are connected with each other in conduction, and the third dynamic contact and the fourth dynamic contact are connected with each other in conduction; the dynamic rotating disc (2) is rotatably connected with the fixed support (1). The dynamic rotating disc (2) comprises a dynamic contact fixed disc (201) and a central shaft, the central shaft is fixed on the dynamic contact fixed disc (201), and each dynamic contact is fixed on the dynamic contact fixed disc (201). When the pulse capacitor conversion device is in a first state, the first dynamic contact is connected with the first static contact, so as to make the first capacitor and the second capacitor parallel, and improve the total capacity of capacitor output; When the pulse capacitor conversion device is in a second state, the first dynamic contact is connected with the second static contact, so as to make the first capacitor and the second capacitor series, and reduce the total capacity of capacitor output; The capacitor of the pulse capacitor conversion device when the cable fault locating power supply is in a low voltage is four times of the capacitor when the cable fault locating power supply is in a high voltage, so as to ensure that the maximum discharge energy of the cable fault locating power supply is the same under two voltage grades.

2. A pulse capacitance converting device for a cable fault location power supply according to claim 1, characterized in that, The fixed support (1) comprises a fixed support bottom plate (101) and a fixed support partition plate (107), the periphery of the fixed support bottom plate (101) is connected with the fixed support partition plate (107) through a plurality of fixed support struts, and each static contact (105) is fixed on the fixed support bottom plate (101); the fixed support bottom plate (101) and the fixed support partition plate (107) are both provided with a positioning hole for the central shaft to extend into.

3. A pulse-capacitor conversion device for a cable fault location power supply according to claim 2, characterized in that, The fixed support bottom plate (101) is further provided with a limiting groove (103), the dynamic contact fixed disc (201) is fixed with a limiting guide rod (205), the limiting guide rod (205) is located in the limiting groove (103), and the moving range of the limiting guide rod (205) in the limiting groove (103) meets the switching connection between the first dynamic contact and the first static contact and the second static contact.

4. A pulse-capacitor conversion device for a cable fault location power supply according to claim 3, characterized in that, The end of the center shaft away from the fixed support (1) is provided with a state detection tablet fixed metal ring (212) and a state detection tablet (211), the state detection tablet (211) is fixed on the state detection tablet fixed metal ring (212), and the state detection tablet fixed metal ring (212) is fixed on the center shaft through a locking nut.

5. A pulse-capacitor conversion device for a cable fault location power supply according to claim 2, characterized in that, The center shaft includes a center shaft upper half (210) and a center shaft lower half (208), the center shaft lower half (208) is located between the fixed support bottom plate (101) and the fixed support partition plate (107), the outermost diameter of the center shaft lower half (208) is greater than that of the center shaft upper half (210), and the end of the center shaft lower half (208) close to the fixed support partition plate (107) is provided with a center shaft pressure spring (209), and the other end of the center shaft pressure spring (209) is connected with the fixed support partition plate (107).

6. A pulse-capacitor conversion device for a cable fault location power supply according to claim 5, characterized in that, The moving contact fixed disc (201) is provided with a plurality of moving contact fixed grooves on the side close to the fixed support bottom plate (101), and each moving contact is fixed in the moving contact fixed groove through a moving contact spring (202).

7. A pulse-capacitor conversion device for a cable fault location power supply according to claim 2, characterized in that, An insulating layer is engraved between two adjacent static contacts (105) on the fixed support bottom plate (101), the surface of the static contact (105) is a spherical structure, and the bottom of the static contact (105) is connected with the fixed support bottom plate (101) through a thread.

8. A pulse-capacitor conversion device for a cable fault location power supply according to claim 2, characterized in that, The fixed support (1) is also provided with a first micro switch (110) and a second micro switch, the first micro switch (110) is connected with a power supply circuit of the cable fault positioning power supply, and the second micro switch is connected with the capacitor output line.

9. A pulse-capacitor conversion device for a cable fault location power supply according to claim 2, characterized in that, The moving contact fixed disc (201) is provided with a locking pin mounting hole (206) for mounting a locking pin to fixedly connect the rotating disc (2) and the fixed support (1).

Images