TWM529923U - A high voltage (HV) impedance device with surface leakage proof configuration applied in HV divider - Google Patents

Abstract

A high voltage (HV) impedance device with surface leakage proof configuration applied in HV divider of present invention is provided. Aforementioned divider is assembled by a high impedance element, an inner case body and an outer case body, wherein the high impedance element is sealed in the inner case body and a closed interlayer between the inner case body and the outer case body is filled with noble gas as an insulating layer. While the high impedance element is applied in high voltage, the closed interlayer can prevent the current-leakage to form impedance paralleled with the high impedance element. Wherein the current-leakage is formed on the surface of insulting portion, or is formed by moisture, dust or corona effect. Therefore, the current-leakage proof divider may maintain the stability/linearity of the voltage division and then reduce the distance between two ends of the high impedance element effectively and still maintain the linearity of measuring voltage. Thence, comparing with the prior art which applied in the same high voltage, the size of present device can be reduced for mobility and convenience.

Description

High voltage divider for high voltage dividers and high voltage impedance devices with leakage current prevention

This creation is a high voltage impedance device for high voltage resistance, especially a high voltage impedance device that can be applied to a high voltage divider and has a leakage current prevention configuration.

In high-voltage equipment, high-voltage impedance components are used to obtain a voltage dividing value. The impedance components are connected in series with several high-resistance components to obtain a high-voltage-resistant function, in order to convert the applied voltage value, and when the high resistance When the two ends of the component gradually increase the high voltage, the humidity of the air in which the environment is set, or the dust concentration, will cause a leakage current when a certain high voltage is reached, and the current forms an equivalent parallel circuit with the high-resistance component, thus affecting The measured voltage value, if the applied voltage is larger, the degree of its influence is greater, so the measured voltage value deviates from linearity, so the degree of resistance to high voltage is limited, and the general device is high. The impedance element is maintained at a considerable distance to meet the linearity of the partial pressure value. If the high-impedance element is made into a high-voltage voltage divider, the height of the finished product must be high, which is inconvenient for the user, such as carrying, moving, or easy. Missing such as dumping.

In summary, how to provide a device that is resistant to high voltage impedance components while maintaining the linearity of the measured values is an important technical problem.

In order to solve the above problems, the object of the present invention is to provide a device that can prevent high-impedance components from generating leakage current when operating in a high voltage environment.

In order to measure the high voltage value of a high voltage device, a high voltage divider is provided between the measurement end point and the reference voltage, and the high voltage component is connected in series with a plurality of high resistance components. And obtaining a low voltage partial voltage value through a high resistance component to measure the DC high voltage value; wherein a plurality of high resistance components are connected in parallel with a compensation circuit, the AC high voltage value can be measured.

Due to the high voltage applied to the high-voltage voltage divider, leakage current is formed on the surface of the insulating case of the device due to high voltage, or leakage between the two terminals due to factors such as moisture, dust and corona. The current, the aforementioned leakage current is equivalent to the equivalent parasitic resistance, and the high-resistance component inside the voltage divider having high voltage resistance has a parallel effect. The impedance value of the parallel effect described above becomes more and more significant as the applied voltage increases. Therefore, the linearity of the voltage divider that is resistant to high voltage is affected. In order to solve this problem, the prior art increases the impedance of the external environment by lengthening the length between the two ends of the high voltage resistant voltage divider to avoid surface damage. Leakage current, so the conventional voltage divider needs to have a considerable length in order to maintain its linearity to meet the demand, so the length of the conventional voltage divider body is not conducive to handling and the loss of easy dumping.

In order to achieve the above object, the present invention proposes a high voltage impedance device applied to a high voltage voltage divider and having a leakage current prevention configuration, the foregoing device being combined by a high resistance element, an inner layer housing, and an outer layer housing, wherein the high The resistive element is sealed in the inner casing, and the inner casing and the outer casing are an insulator, and the interlayer between the inner casing and the outer casing is filled with an inert gas, and the interlayer is sealed as an isolation, so DC high voltage applied to the two ends of the high resistance component When pressed, the leakage current of the outer shell due to high voltage on the surface of the insulator due to the barrier of the inert gas of the interlayer, and the leakage current caused by moisture, dust and corona effect cannot be high with the inner shell. The resistive element produces a parallel effect, so that the length between the high-resistance elements can be effectively reduced, and the linearity of the partial pressure value can still be maintained, and thus the height of the device can be further reduced under the same high-pressure environment, thereby increasing the device's Mobile and easy to use.

The present invention proposes a high voltage impedance device for a high voltage voltage divider and a leakage current prevention configuration, wherein one end of the high resistance component of the inner casing of the device is in contact with a direct current high voltage, and the other end of the high resistance component After connecting with a voltage dividing resistor element, the DC voltage dividing value conforming to linearity can be obtained, so the voltage divider can measure the DC high voltage; wherein the high resistance component and the voltage dividing resistor component are connected in parallel with a compensation circuit, the branch The pressure gauge will measure the AC high voltage value as its characteristic.

E _P ‧‧‧End Point

P _REF ‧‧‧reference voltage point

VR‧‧‧ adjustable resistor

VM‧‧‧Voltagemeter

Vo‧‧‧ output voltage value

H‧‧‧height

Cc‧‧‧resistance compensation component

W1‧‧‧Wire

1‧‧‧Applicable to high voltage dividers and with leakage current prevention High voltage impedance device

10‧‧‧ Cover

1011‧‧‧First sealing element

1012‧‧‧Second sealing element

1013‧‧‧Latching element

11‧‧‧ first end

12‧‧‧ second end

13‧‧‧High resistance components

131‧‧‧Electrical contacts

14‧‧‧ Inner shell

140‧‧‧High resistance component setting space

141‧‧‧ Groove

15‧‧‧ outer shell

16‧‧‧Mezzanine

17‧‧‧Endpoint protection components

171‧‧‧Protection ring

172‧‧‧protection board

173‧‧‧Connector

174‧‧‧Protection plate opening

175‧‧‧Protection ring opening

18‧‧‧Retractable feet

19‧‧‧ boards

20‧‧‧opening

21‧‧‧Contact opening

FIG. 1 is an exploded perspective view of an embodiment of the authoring apparatus.

FIG. 2 is a schematic diagram of a combination of an embodiment of the authoring apparatus.

3 is an exploded perspective view of a voltage divider embodiment of the authoring device.

4 is a cross-sectional view of the bottom second end of the embodiment of the voltage divider of the authoring apparatus.

Figure 5 is a cross-sectional view of the top end of the top portion of the voltage divider embodiment of the authoring device.

Figure 6 is an equivalent circuit diagram of an embodiment of a DC voltage divider of the authoring apparatus.

Figure 7 is an equivalent circuit diagram of an embodiment of an AC voltage divider of the authoring apparatus.

FIG. 8 is a schematic view of the embodiment of the voltage divider of the authoring device having a retractable foot.

The specific embodiments are described below to illustrate the implementation of the present invention, but are not intended to limit the scope of the present invention.

Please refer to FIG. 1 , which is an exploded perspective view of an embodiment of a high voltage impedance device 1 for applying a high voltage voltage divider and having a leakage current prevention configuration. The device is between the first end 11 and the second end 12 . The inner casing 14 and the outer casing 15 are provided, and the inner casing 14 and the outer casing 15 are both insulators, wherein the inner casing 14 is a hollow pipe body (for example, a circular pipe), and the inner casing The inner space of the body 14 is placed with a high-resistance element 13 and filled with an insulating material 140 or an inert gas (Fig. 2); the outer casing 15 is a hollow tube body (for example, a circular tube), and the outer casing The outer diameter of the two ends of the 15 is larger than the outer diameter of the remaining tubular body, and the outer casing 15 is sleeved with the inner casing 14, so that a gap is formed between the inner casing 14 and the outer casing 15, and the gap is used for preventing the end. A closed leakage layer 16 of point leakage current (Fig. 2).

The gap between the inner casing 14 and the outer casing 15 is transmitted through a sealing member (for example, an O-ring or the like), or the sealing material is disposed at the two ends of the inner casing 14 to form a closed space with the outer casing 15. The two ends of the inner casing 14 are provided with a recess 141. Each of the recesses 141 can be sleeved with the first sealing member 1011 to form a closed space with the outer casing 15. That is, the interlayer 16 is filled with an anti-interference inert gas in the closed interlayer 16 to increase the anti-interference ability. The inert gas can be selected from sulfur hexafluoride (SF6), which can reduce the external leakage of the high-resistance element 13 when operating at a high voltage. The phenomenon, and the surface resistance formed between the two end points; the high resistance element 13 may be selected from a single high resistance, or a plurality of high resistance series may be selected, but the form of the high resistance element 13 is not limited thereto; The leakage preventing capability between the first end 11 and the second end 12 overlaps the second sealing member 1012 between the cover 10 and the end of the inner casing 14 to form a multi-sandwich type, thereby being more effective against leakage current. The function.

The first end 11 and the second end 12 are electrically connected to the first end 11 and the second end 12, respectively, and the device is further at the first end 11 respectively. And two cover plates 10 are disposed on the second end 12, the cover plate 10 has five holes, one hole is at a center point (contact opening 21), the other four openings 20 are at the edge, and the opening 20 is used with a bolt The locking member 1013 (for example, a screw or a pin or the like) respectively couples the two cover plates 10 to the two ends of the outer casing 15, and the two end edges of the outer casing 15 have four hole seats, and the four hole seats and the cover plate 10 The four openings 20 of the edge are identical in position and thus have a function of attachment fixation, which can enhance the stability between the first end 11 and the second end 12.

The high-resistance element 13 described above is a high-resistance series combination of a plurality of 100 MΩ or more, and the high resistance means a resistor with a withstand voltage of 10 kV.

The conventional high-impedance DC high-voltage voltage dividing device needs to be arranged with a long-length housing between the two ends of the high-resistance (the first end 11 and the second end 12) to avoid the high-resistance two-terminal end being subjected to high voltage. The surface shell forms a surface resistance, and the surface resistance forms a parallel effect with the high resistance, thereby directly reducing the high resistance value, so that the linearity of the partial pressure measurement is affected; the high voltage resistant impedance element of the present invention is The high voltage impedance device 1 is applied to a high voltage voltage divider and has a leakage current configuration. The conductive contacts 131 are formed by the inner casing 14, the inert gas in the interlayer 16, the outer casing 15 and the cover plate 10. The isolation structure can avoid leakage phenomenon. Therefore, under the condition that the same high voltage is applied between the conductive contacts 131, the present authoring device 1 can have a higher impedance high voltage partial pressure than the conventional one. The arrangement length of the device is short, so that the device body is miniaturized.

Please refer to FIG. 3 , which is a schematic diagram of a voltage divider of another embodiment of the authoring device 1 . In this embodiment, the two end points (the first end 11 and the second end 12 ) of the device are respectively provided with one end. A point protection element 17 is an element made of a conductive material, the structure of which is combined by a hollow annular tubular guard ring 171 and a flat protective plate 172, wherein the guard ring 171 is surrounded. The periphery of the protective plate 172 has five holes in the protective plate 172, one of which is at the center point, and the other four of which are at the edge, and the hole at the center of the protective plate 172 provides the both ends of the high-resistance element 13 ( The first end 11 and the second end 12) are connected, and the other four holes (protection plate opening 174) are placed at the edge, and the positions of the five holes correspond to the positions of the five openings 20 of the cover 10, wherein four are used. A latching element 1013 secures the protective element 17 to the second end of the outer casing 15.

Please refer to FIG. 4 , which is a cross-sectional view of the bottom second end 12 of the voltage divider embodiment of the authoring device 1 , wherein the conductive contacts 131 at one end of the high-resistance component 13 in the inner layer housing 14 are via the cover 10 . The hole of the center point (the contact opening 21) is taken out through the hole of the center point of the protection plate 172, which is an end portion EP, and the end portion EP and an adjustable resistor VR (or half) on a circuit board 19. One end of the adjustable resistor is connected, the circuit board 19 is fixed on the protection board 172, and the other end of the adjustable resistor VR is connected to the protection ring 171. The protection ring 171 is a reference voltage point PREF, so the adjustable resistor VR is high. The resistive element 13 forms a series circuit; wherein the annular tubular side of the guard ring 171 is provided with two holes, one hole (protective ring opening 175) is introduced into the end portion EP connected wire W1, and the other end of the wire W1 is connected to A BNC type circuit connector 173 is embedded in another hole of the annular tubular side of the guard ring 171, so that a contact for providing a voltage can be extracted from the BNC type circuit connector 173, and the contact can be Directly measure the voltage value via a voltmeter VM, as indicated by the dotted line in the figure, or EP point portion connecting a coaxial cable output; an annular guard ring height h of the tubular 171 above the line of the end portion Ep, and an adjustable resistor VR, it can prevent a voltage measuring by external object touches interference. The aforementioned wire w1 uses an electric wire coated with an insulating layer to prevent a short circuit between the end portion EP and the guard ring 171.

Please refer to FIG. 5 , which is a cross-sectional view of the top first end 11 of the voltage divider embodiment of the authoring device 1 , wherein the guard ring 171 surrounds the periphery of the protection plate 172 , and the hole at the center of the protection plate 172 provides high resistance. The first end 11 of the component 13 is electrically connected to the end protection element 17, so that the protection ring 171 is conveniently in contact with the measured high voltage, which facilitates operation, and the position of the protection plate opening 174 of the protection plate 172 corresponds to the cover 10 The cover opening 20 is secured to the first end of the outer casing 15 via the cover opening 20 and the protective plate opening 174 using the latching element 1013.

Please refer to FIG. 6 , which is a DC equivalent circuit diagram of a voltage divider embodiment of the authoring device. The DC equivalent circuit is connected in series with the adjustable resistor VR and then connected to a reference voltage point PREF. A voltage meter VM (optionally using a digital voltmeter VM or an analog voltmeter VM) is provided between the end portions EP to measure the voltage value at the end portion EP, so that the DC high voltage can be measured.

Please refer to FIG. 7 , which is an AC equivalent circuit diagram of a voltage divider embodiment of the authoring device. The AC equivalent circuit is similar to the DC equivalent circuit FIG. 6 except that the DC equivalent circuit of FIG. 6 is high resistance element 13 and After the adjustable resistor VR is connected in parallel with the resistance compensating component CC (for example, a frequency compensating component such as a capacitor or an inductor), the device 1 can measure the AC high voltage.

Referring to FIG. 8 , the voltage divider of the authoring device 1 has a retractable foot 18 in another embodiment, and the protective plate 171 at the position of the retractable foot 18 and the second end 12 is annularly tubular. The bottom end of the retracting foot 18 has a plurality of retracting legs, and one end of the retracting foot is pivotally connected to the retracting foot 18 and is horizontally scaled when the force is applied to the retracting foot. Since the retracting foot 18 has a horizontal zooming function, when the foot is extended, the horizontal supporting distance can be increased, thereby facilitating the operational stability of the present authoring apparatus 1.

When high voltage is applied to the two ends of the prior art high-impedance resistor device, due to high resistance The voltage of each resistor contact in the anti-resistance device is much higher than the ambient voltage. Therefore, when the working environment is relatively humid or the dust concentration in the air is high, the resistance contact is easy to form a leakage path with the external environment, thus affecting the voltage division. The linearity of the value, or the formation of parallel parasitic resistance between the resistance contacts; in contrast, the inventive device 1 surrounds the high resistance element 13 by encapsulating the inert gas of the interlayer 16 (Fig. 3), thereby enhancing the barrier of the high resistance element 13. Leakage current, under the same external environmental conditions, the height of the created voltage divider can be effectively reduced while still maintaining the linearity of the measured voltage.

The detailed description above is a detailed description of one of the possible embodiments of the present invention, and the embodiment is not intended to limit the scope of the patents, and the equivalent implementations or modifications that are not included in the spirit of the present invention should be included in In the patent scope of this case

1‧‧‧Application to high voltage dividers and high voltage impedance devices with leakage current prevention

10‧‧‧ Cover

1011‧‧‧First sealing element

1012‧‧‧First sealing element

1013‧‧‧Latching element

11‧‧‧ first end

12‧‧‧ second end

13‧‧‧High resistance components

131‧‧‧Electrical contacts

14‧‧‧ Inner shell

141‧‧‧ Groove

15‧‧‧ outer shell

16‧‧‧Mezzanine

20‧‧‧opening

Claims (4)

A high voltage impedance device for a high voltage voltage divider and a leakage current prevention configuration, comprising: a high resistance component comprising one or a plurality of high resistances connected in series; an inner casing, the inner casing being hollow a tubular insulative housing between the first end and the second end of the high voltage impedance device, wherein the inner space of the inner casing houses the high resistance component and fills the interior with an insulating material or an inert gas a recess is formed in each of the two ends of the inner casing, the recesses respectively sleeve the first sealing component; an outer casing, the outer casing is a tubular insulating casing, located at a high voltage Between the first end and the second end of the impedance device, the outer casing sleeves the inner casing to form a closed portion by the first sealing member on the inner casing being in close contact with the outer casing An interlayer is filled with an inert gas; wherein both ends of the outer casing are combined with a cover plate, and a second seal is disposed between each inner surface of the cover and the inner end of the inner casing element. The high voltage impedance device according to claim 1, wherein the end point protection elements are respectively installed at the two end points, and each of the end point protection elements comprises a hollow annular tubular protection ring and a flat protection plate, wherein the protection The ring surrounds the periphery of the protection plate, wherein the protection plate is connected to the outer casing via the latching element, wherein one of the conductive contacts on the high resistance element is connected via the opening of the cover at the first end And the end protection element at the first end; wherein the other conductive contact on the high resistance element passes through the opening of the cover at the second end, and then passes through the end protection element at the second end Opening the hole to connect one end of an adjustable resistor on a circuit board, the circuit board is fixed on the protection board, and the other end of the adjustable resistor Connecting the protection ring, wherein the protection ring of the second end is set as a reference voltage point, wherein the end portion is connected to a connector via a wire, and the connector is embedded on the protection ring at the second end, and the output is The joint is assembled and oriented according to actual needs. The joint is not limited in shape, and can be directly taken out by a coaxial wire. The high voltage impedance device of claim 2, wherein the high resistance element and the adjustable resistor are further connected in parallel with the resistance compensation component to measure an alternating high voltage. The high voltage impedance device of claim 2, wherein the bottom edge of the end protection element at the second end is connected to a retracting foot, the retracting foot having a plurality of retracting feet, the retracting One end of the foot pivotally connects the retracting foot and is horizontally scaled when applying the retracting foot.