CN216819358U

CN216819358U - Sheath voltage monitoring grounding box

Info

Publication number: CN216819358U
Application number: CN202123201018.2U
Authority: CN
Inventors: 张世元; 杨刚; 孙宇东; 刘树贺
Original assignee: Zhejiang New Tuwei Electronics Technology Co ltd
Current assignee: Zhejiang New Tuwei Electronics Technology Co ltd
Priority date: 2021-11-24
Filing date: 2021-12-17
Publication date: 2022-06-24
Anticipated expiration: 2031-12-17

Abstract

The utility model relates to a sheath voltage monitoring grounding box, which comprises a box body, a capacitor bank, a grounding cable and a sheath protection device, wherein the capacitor bank, the grounding cable and the sheath protection device are arranged in the box body; a plurality of capacitors are connected in series to be connected to two ends of the protective layer, and after the capacitors are connected in series, the withstand voltage of the capacitors is far greater than the withstand voltage standard of the protective layer; the weak current sampling circuit measures the tail end of the cable subjected to capacitance voltage division by virtue of a primary capacitor of a grounded cable, so that the problem that the voltage resistance of the sampling circuit is required to exceed the standard of the action voltage of the sheath is solved; meanwhile, the wireless communication function of the energy transmission module and the communication module in the electric signal transmission system realizes the complete isolation of the acquisition circuit from the measurement circuit.

Description

Sheath voltage monitoring grounding box

Technical Field

The utility model relates to the technical field of high-voltage technology and automatic control equipment, in particular to a sheath voltage monitoring grounding box.

Background

The detection of the sheath voltage of high voltage cables has been a difficult problem, and the sheath voltage normally ranges from a few volts to a few tens of volts. But it is also possible to have voltages of up to several kilovolts. The traditional voltage transformer measures when detecting high voltage. And non-contact electrostatic measurements. In the measurement of a voltage transformer, the withstand voltage of the transformer is difficult to reach the required 10kv withstand voltage level. The machines are large to achieve this pressure rating. And it is difficult to measure small voltage values. While non-contact electrostatic measurement can only measure voltage in kv, it cannot measure small voltages of a few volts.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of voltage detection in the prior art, and provides a sheath voltage monitoring grounding box.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a sheath voltage monitoring grounding box, includes the box, and installs electric capacity group, ground connection cable, sheath protection device in the box, sheath protection device one end direct ground connection, the other end passes through sheath protection device connects ground connection cable ground connection, electric capacity group connects sheath protection device's both ends.

Preferably, the grounding box further comprises a voltage detection circuit, and the voltage detection circuit is connected to a stage of the capacitor bank close to the grounding cable.

Preferably, the capacitor bank is formed by connecting a plurality of capacitors in series.

Preferably, three grounding cables are arranged in the box body, and the grounding cables are provided with the capacitor sets.

Preferably, the grounding box further comprises an electrical signal transmission system, and the electrical signal transmission system is fixedly arranged below the capacitor bank and close to the position of the grounding cable.

Preferably, the electrical signal transmission system comprises an energy transmission module and a communication module, and the energy transmission module is connected with the communication module.

Preferably, the energy transmission module comprises an energy supply coil, and the communication module comprises a signal concentration and retransmission unit.

Preferably, the energy transmission module and the communication module are both wireless devices.

Compared with the prior art, the utility model has the beneficial effects that:

according to the sheath voltage monitoring grounding box provided by the technical scheme, the weak current sampling circuit measures the tail end of the grounding cable after voltage division by the capacitor by virtue of the primary capacitor of the grounding cable, so that the standard that the voltage resistance of the sampling circuit is required to exceed the action voltage of the sheath is solved, and meanwhile, the energy transmission module and the communication module in the electric signal transmission system realize the complete isolation of the acquisition circuit from the measurement circuit.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a sheath voltage monitoring grounding box provided in the present invention.

Fig. 2 is a schematic view of a portion of the sheath voltage monitoring grounding box shown in fig. 1.

Fig. 3 is a circuit diagram of a voltage detection circuit according to the present invention.

Description of reference numerals:

10. a box body; 11. a protective layer protection device; 12. a capacitor bank; 13. a ground cable; 14. a voltage detection circuit; 20. an electrical signal transmission system; 21. an energy transmission module; 22. and a communication module.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 2, an embodiment of the present invention provides a sheath voltage monitoring grounding box, which includes a box body 10, and a capacitor bank 12, a grounding cable 13, and a sheath protection device 11 installed in the box body 10, wherein one end of the sheath protection device 11 is directly grounded through a connecting copper bar or a copper terminal, and the other end of the sheath protection device 11 is directly grounded through the sheath protection device 11 and the grounding cable 13; meanwhile, the capacitor bank 12 is connected to both ends of the sheath protection device 11.

Specifically, as shown in fig. 3, the grounding box 10 further includes a voltage detection circuit 14, wherein the voltage detection circuit 14 is connected to a stage of the capacitor bank 12 close to the grounding cable 13, so as to detect a voltage of a last stage of the capacitor bank 12 and calculate a sheath voltage according to a voltage division ratio of the capacitor bank.

Specifically, the capacitor group 12 is formed by connecting a plurality of capacitors in series, for example, a 2000V-withstand safety capacitor; it should be noted that the voltage resistance of the capacitor bank 12 after being connected in series exceeds the requirement of high-voltage cables of different grades on the voltage resistance grade of the sheath.

Specifically, three grounding cables 13 are arranged in the box 10, wherein the grounding cables 13 are provided with the capacitor sets 12 and are connected with two ends of the sheath protection device 11.

Specifically, the grounding box 10 further includes an electrical signal transmission system 20, wherein the electrical signal transmission system 20 is fixedly disposed below the capacitor bank 12 and near the grounding cable 13, so as to facilitate isolated power supply signal sampling.

Specifically, the electrical signal transmission system 20 includes an energy transmission module 21 and a communication module 22, wherein the energy transmission module 21 is connected to the communication module 22, and integrates function sampling and signal transmission.

Specifically, the energy transmission module 21 has an energy supply coil, the communication module 22 has a signal concentration forwarding unit, and both the energy transmission module and the communication module are wireless devices.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. A sheath voltage monitoring grounding box is characterized by comprising a box body, a capacitor bank, a grounding cable and a sheath protection device, wherein the capacitor bank, the grounding cable and the sheath protection device are arranged in the box body; one end of the protective layer protection device is directly grounded, the other end of the protective layer protection device is connected with the grounding cable to be grounded, and the capacitor bank is connected to two ends of the protective layer protection device.

2. The sheath voltage monitoring grounding box of claim 1, wherein the grounding box further comprises a voltage detection circuit connected to a stage of the capacitor bank near the grounding cable.

3. The sheath voltage monitoring grounding box of claim 1, wherein the capacitor set is formed by connecting a plurality of capacitors in series.

4. The sheath voltage monitoring grounding box of claim 1, wherein three grounding cables are arranged in the box body, and the grounding cables are provided with the capacitor sets.

5. The sheath voltage monitoring grounding box of claim 1, wherein the grounding box further comprises an electrical signal transmission system, the electrical signal transmission system is fixedly disposed below the capacitor bank and near the grounding cable.

6. The sheath voltage monitoring grounding box of claim 5, wherein the electrical signal transmission system comprises an energy transmission module and a communication module, and the energy transmission module is connected with the communication module.

7. The sheath voltage monitoring grounding box of claim 6, wherein the energy transmission module comprises an energy supply coil, and the communication module comprises a signal concentration and retransmission unit.

8. The sheath voltage monitoring grounding box of claim 6, wherein the energy transmission module and the communication module are wireless devices.