CN219320385U

CN219320385U - Sheath-penetrating voltage sensor meeting secondary fusion

Info

Publication number: CN219320385U
Application number: CN202320268916.XU
Authority: CN
Inventors: 徐立子; 周大伟
Original assignee: Zhuhai Lichao Electric Power Technology Co ltd
Current assignee: Zhuhai Lichao Electric Power Technology Co ltd
Priority date: 2023-02-21
Filing date: 2023-02-21
Publication date: 2023-07-07
Anticipated expiration: 2033-02-21

Abstract

The utility model relates to the technical field of electric power grids, in particular to a threading voltage sensor meeting secondary fusion, which comprises an outer casting body, wherein an inner casting body is sleeved in the outer casting body, one side of the inner casting body, which is far away from the outer casting body, is connected with a data acquisition box.

Description

Sheath-penetrating voltage sensor meeting secondary fusion

Technical Field

The utility model relates to the technical field of power grids, in particular to a sleeved voltage sensor meeting secondary fusion.

Background

The Chinese patent publication No. CN114362020A discloses a secondary fusion ring main unit, which is disclosed in detail in the specification about the secondary fusion ring main unit, however, in the specific use of the existing secondary fusion ring main unit, a voltage sensor is also required to detect voltage or current signals with serious waveform distortion in a power grid, most of the voltage sensors adopt electromagnetic voltage transformers with iron cores, and the voltage sensors are large in size, heavy, complex in installation, operation and maintenance, high in price, poor in instantaneity, and difficult to realize the application of the secondary fusion ring main unit due to large errors, so that the implementation of an intelligent power distribution network is not facilitated.

In summary, it is necessary to invent a pull-in voltage sensor that satisfies a secondary fusion.

Disclosure of Invention

Therefore, the utility model provides a threading voltage sensor meeting secondary fusion, so as to solve the problems that the voltage sensor mostly adopts an electromagnetic voltage transformer with an iron core, and the voltage sensor has large volume, heavy weight, complex installation, operation and maintenance, high price, poor instantaneity, large error, difficulty in realizing the application of a secondary fusion ring main unit and inconvenience in realizing an intelligent power distribution network.

In order to achieve the above object, the present utility model provides the following technical solutions: the through-sleeve voltage sensor meeting the requirement of secondary fusion comprises an outer casting body, wherein an inner casting body is sleeved in the outer casting body, the inner casting body 200 is made of ceramic, the outer casting body 100 is made of epoxy resin, and one side, far away from the outer casting body, of the inner casting body is connected with a data acquisition box.

Preferably, a copper screw thread piece is fixed at the top end of the inner wall of the outer casting body, and a silver plating piece is arranged between the copper screw thread piece and the top end of the outer wall of the inner casting body.

Preferably, the bottom of silver-plated piece and the outer wall top butt of interior casting body, one side inner wall threaded connection that interior casting body was kept away from to the copper screw thread piece has zinc-plated screw, the one end that the copper screw thread piece was kept away from to zinc-plated screw is connected with SF6 looped netowrk cabinet 10kV wiring end.

Preferably, the outer wall bottom cover of interior casting body is equipped with high-pressure epoxy shell, the material of high-pressure epoxy shell is the same with the material of outer casting body.

Preferably, the outer wall bottom end of the inner casting body is fixed with a cable interface, the middle bottom end of the inner casting body is connected with a shielding cable through the cable interface, and one end of the shielding cable, which is far away from the inner casting body, is connected with the input end of the data acquisition box.

The beneficial effects of the utility model are as follows:

compared with an electromagnetic voltage transformer with an iron core, the utility model has the advantages of high accuracy, reasonable design structure and low cost by adopting the ceramic capacitor voltage division principle, and compared with the electromagnetic voltage transformer, the sensor has low price and can meet the acquisition requirements of phase voltage and zero voltage by matching with the VV voltage transformer;

the utility model discloses can direct output small voltage signal when specific use, simplified the system architecture, reduced the error source, improved overall system's stability and accuracy, simultaneously because not contain the iron core, so can not saturate, frequency range is wide, measuring range is big, the linearity is good, interference killing feature is strong, can make protection device reliable action under the system fault state, and can not produce the overcurrent when voltage output secondary short circuit, also can not produce ferromagnetic resonance, eradicated the major fault hidden danger in the electric power system, ensured personnel and equipment's safety.

Drawings

FIG. 1 is a schematic diagram of the overall circuit connection structure of the present utility model;

FIG. 2 is a schematic cross-sectional view of the present utility model in elevation;

FIG. 3 is a schematic perspective view of an inner casting body according to the present utility model;

fig. 4 is a schematic diagram of the circuit of the present utility model.

In the figure: 100. an outer casting body; 110. a galvanized screw; 120. a copper screw; 130. silver plating; 200. an inner casting body; 210. a high pressure epoxy housing; 300. a shielded cable; 400. and a data acquisition box.

Detailed Description

The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.

Referring to fig. 1-4, the through-sleeve voltage sensor for satisfying two-time fusion provided by the utility model comprises an outer casting body 100, wherein the outer casting body 100 is arranged for sealing and protecting an inner casting body 200, meanwhile, the outer casting body 100 is arranged in a corrugated shape instead of connecting the inner casting body 200 with a gas tank filled with SF6 gas, the inner casting body 200 is sleeved in the outer casting body 100, the inner casting body 200 is made of ceramic, the outer casting body 100 is made of epoxy resin, the number of the inner casting bodies 200 is three, the three inner casting bodies 200 are arranged for carrying out pressure reduction treatment on 10KW transmitted, one side of the inner casting body 200 far away from the outer casting body 100 is connected with a data acquisition box 400, the data acquisition box 400 is arranged for receiving a pressure signal after pressure reduction, the voltage is converted and then is transmitted to a host for detecting a power grid, so that related personnel can know the change of a power grid signal in time, a copper screw 120 is fixed at the top end of the inner wall of the outer casting body 100, a silver plating piece 130 is arranged between the copper screw 120 and the top end of the outer wall of the inner casting body 200, the bottom end of the silver plating piece 130 is abutted to the top end of the outer wall of the inner casting body 200, a galvanized screw 110 is connected with the inner wall of one side of the copper screw 120 far away from the inner casting body 200 in a threaded manner, one end of the galvanized screw 110 far away from the copper screw 120 is connected with an SF6 ring main unit 10kV terminal, the galvanized screw 110 is used for electrically connecting the input end of the device with the SF6 ring main unit 10kV terminal, and the galvanized screw 110 and the copper screw 120 play roles of conducting electricity and reducing the voltage in cooperation with the inner casting body 200;

the outer wall bottom cover of interior casting body 200 is equipped with high-pressure epoxy shell 210, the material of high-pressure epoxy shell 210 is the same with the material of outer casting body 100, and the high-pressure epoxy shell 210 of setting is in order to protect the naked part of interior casting body 200, the outer wall bottom mounting of interior casting body 200 has cable interface, there is shielded cable 300 in the middle of the bottom of interior casting body 200 through cable interface connection, the one end that shielded cable 300 kept away from interior casting body 200 is connected with the input of data acquisition box 400, and the shielded cable 300 of setting is in order to carry the voltage signal after the high-pressure epoxy shell 210 step down to data acquisition box 400 department.

The application process of the utility model is as follows: firstly, when the device is used, the outer casting body 100 and the inner casting body 200 are required to be placed in an air box, meanwhile, a 10KW power transmission line is connected with a galvanized screw 110, after the connection is completed, the insertion end of the inner casting body 200 is inserted into the outer casting body 100, then the outer casting body 100 is fixed at the inner wall side end of the air box, one end of the inner casting body 200 far away from the outer casting body 100 is extended to the outer wall of the air box through a through hole formed in the air box, then a worker can utilize a metal clamping piece, the metal clamping piece is arranged at one side of the inner casting body 200 far away from the outer casting body 100, meanwhile, the metal clamping piece is fixed with the outer wall side end of the air box through bolts, after the metal clamping piece is fixed, the inner casting body 200 is pressed with the outer casting body 100, so that the top end of the inner casting body 200 is abutted with the bottom end of a silver plating piece 130, if a user has a protection level requirement, a metal sealing box can be sleeved outside, the metal sealing box is used for guiding out, before the metal clamping piece is installed, one end of a shielding cable 300 is required to be connected with the inner casting body 200 through a cable, and the cable 300 is further arranged at one end far away from the inner casting body, and the inner casting body 200 is far away from the outer wall side of the air box, the cable 300 is connected with the outer end of the air box, and the data can be connected with the main machine 400 through the cable 400, and the data acquisition end can be connected with the cable 400;

after connection is completed, a worker can transmit 10kV high voltage to the galvanized screw 110 through the 10kV wiring end of the SF6 ring main unit, and because the number of the devices is three, the high voltage transmitted by the 10kV wiring end of the SF6 ring main unit can be divided, the transmitted high voltage can be transmitted to the inner casting body 200 through the galvanized screw 110, the copper screw 120 and the silver plating 130, the set inner casting body 200 can reduce the high voltage, so that the high voltage can be reduced to a voltage range which can be received by the data acquisition box 400, a voltage signal which is reduced by the inner casting body 200 can be transmitted to the data acquisition box 400 through the shielding cable 300, and the set data acquisition box 400 can be transmitted to a host machine for detecting a power grid after receiving the voltage signal and converting the voltage signal, so that related personnel can know the change of the power grid signal in time;

the circuit principle of the utility model is as follows: when the sensor is used as a zero sequence and phase sequence voltage integrated sensor, the output ends of the A, B, C three-phase high-voltage end voltage dividing capacitors CA, CB and CC are connected in parallel and connected in series with a phase sequence measuring capacitor, U0 is a secondary zero sequence signal output, and can be connected with a protection monitoring device, the U0 output is approximately 0V when the power grid normally operates, and the output is 6.5V/3 when a single-phase grounding fault occurs, and the phase sequence signal is 3.25// V.

The above description is of the preferred embodiments of the present utility model, and any person skilled in the art may modify the present utility model or make modifications to the present utility model with the technical solutions described above. Therefore, any simple modification or equivalent made according to the technical solution of the present utility model falls within the scope of the protection claimed by the present utility model.

Claims

1. The wearing formula voltage sensor that satisfies a secondary and fuse, its characterized in that: including outer casting body (100), the inside cover of outer casting body (100) is equipped with interior casting body (200), the material of interior casting body (200) is ceramic, the material of outer casting body (100) is epoxy, one side that outer casting body (100) were kept away from to interior casting body (200) is connected with data acquisition box (400).

2. The pull-in voltage sensor of claim 1, wherein the pull-in voltage sensor is configured to meet a secondary fusion: a copper screw (120) is fixed at the top end of the inner wall of the outer casting body (100), and a silver plating piece (130) is arranged between the copper screw (120) and the top end of the outer wall of the inner casting body (200).

3. The pull-in voltage sensor satisfying a secondary fusion of claim 2, wherein: the bottom of silver-plated piece (130) and the outer wall top butt of interior casting body (200), one side inner wall threaded connection that interior casting body (200) was kept away from to copper screw (120) has zinc-plated screw (110), one end that copper screw (120) was kept away from to zinc-plated screw (110) is connected with SF6 looped netowrk cabinet 10kV wiring end.

4. The pull-in voltage sensor of claim 1, wherein the pull-in voltage sensor is configured to meet a secondary fusion: the high-pressure epoxy shell (210) is sleeved at the bottom end of the outer wall of the inner casting body (200), and the high-pressure epoxy shell (210) is made of the same material as the outer casting body (100).

5. The pull-in voltage sensor of claim 4, wherein the pull-in voltage sensor is configured to perform a secondary fusion: the cable connector is fixed at the bottom end of the outer wall of the inner casting body (200), a shielding cable (300) is connected to the middle bottom end of the inner casting body (200) through the cable connector, and one end, far away from the inner casting body (200), of the shielding cable (300) is connected with the input end of the data acquisition box (400).