Casing flange of the built-in signal acquisition device of the end screen

Abstract

The utility model relates to a sleeve flange with a built-in signal acquisition device for an end screen. The utility model includes a flange body and an end screen seat of an integrated structure, and a signal acquisition device is arranged on the end screen seat. The end screen core is insulated and fixedly connected to the end screen seat, and one end of the end screen core extends into the flange body, and is connected and conducted with the capacitor end screen in the flange body. The signal acquisition device includes a metal shell, and the side wall of the metal shell is provided with an aviation plug interface, and an insulating sleeve is arranged inside. The end screen core passes through the insulating sleeve, and the insulating tube and the low-frequency dielectric loss sensor are sleeved outside the insulating sleeve, and a circular high-frequency partial discharge sensor is arranged in the circular insulating tube. An interface end cover is arranged corresponding to the aviation plug interface, and an end screen cover is arranged corresponding to the head of the end screen core. The utility model does not change the original style of the sleeve flange, and is convenient for detecting high-frequency partial discharge of the sleeve, end screen grounding current and other signals. The utility model has good shielding and anti-interference performance, and is simple and convenient to disassemble and install during testing.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric power equipment and relates to a sleeve flange with a built-in signal acquisition device in an end screen. Background Art

[0002] In the power system, the high-voltage bushing is used for high-voltage conductors to pass through the partition with different potentials, and plays an insulating and supporting role. It is an important component of power transmission and transformation equipment. The performance of the high-voltage bushing directly determines the safety and operating efficiency of the entire power project.

[0003] For routine maintenance or preventive testing of high-voltage bushings, it is necessary to remove the bushing end screen cover and collect signals through the bushing end screen lead-out core for testing. The existing bushing end screen signal collection devices collect current, phase and other signals of the bushing end screen by changing the bushing end screen grounding structure and extending the bushing end screen grounding wire. The devices have defects such as inconvenient installation, large signal attenuation, low detection efficiency and potential safety hazards.

[0004] Invention No. CN201710883253 discloses a capacitive bushing end screen signal detection device, which is threadedly connected to the bushing end screen base, and the bushing end screen lead core is inserted into the center of the end screen terminal inside the device, reliably contacts the crown spring inside the device, and is reliably grounded through the shell, and the high-frequency partial discharge sensor and low-frequency dielectric loss sensor for collecting signals are set on the end screen terminal. The device needs to be disassembled frequently during routine status inspection tests or preventive tests, and the threads are easily worn and poorly contacted over time; the crown spring inside the device that contacts the bushing end screen lead core may lose elasticity, poorly grounded, and reduced reliability, affecting the performance and safety of the high-voltage bushing, and seriously affecting the safety of the user. Summary of the invention

[0005] The utility model aims to provide a sleeve flange of a terminal screen built-in signal collection device in view of the deficiencies in the prior art.

[0006] The utility model comprises a flange body and a signal collection device.

[0007] The side wall of the flange body is provided with a terminal screen seat, the terminal screen seat and the flange body are an integrated structure, and the signal acquisition device is arranged on the terminal screen seat.

[0008] A cylindrical groove is provided at the center of the end screen seat, threads are tapped on the side walls of the groove, and a through hole is provided on the bottom surface of the groove; an insulating porcelain sleeve is arranged in the groove, and a ring-shaped protrusion is provided along the circumference in the middle part of the insulating porcelain sleeve, one side of the protrusion is connected to the bottom surface of the groove, and a core pressing copper sleeve is provided on the other side, and the core pressing copper sleeve is threadedly connected to the groove, and the insulating porcelain sleeve is pressed tightly in the groove through the core pressing copper sleeve; the end screen core passes through the center of the insulating porcelain sleeve and is fixedly connected to the insulating porcelain sleeve, one end of the end screen core and a part of the insulating porcelain sleeve pass through the through hole and extend into the flange body, and the end screen core is connected and conductive to the capacitor end screen in the flange body.

[0009] The signal acquisition device includes a metal shell, one end face of the metal shell is an open end, and the open end is fixedly connected to the end screen seat; the center of the other end face of the metal shell is provided with an end screen core through hole, and an insulating sleeve is arranged in the metal shell, and one end of the insulating sleeve is fixed to the end screen core through hole; an end screen cover is movably arranged on the end face of the metal shell, and an end screen core slot is arranged on the end screen cover corresponding to the end screen core through hole, and a spring contact finger is arranged on the inner wall circumference of the end screen core slot; the end screen core is arranged through the insulating sleeve, and the other end of the end screen core is arranged in the end screen core slot, and is connected to the end screen cover through the spring contact finger. The end screen core, insulating porcelain sleeve, core pressing copper sleeve and groove are coaxially arranged.

[0010] The metal shell is provided with an annular insulating cylinder and an annular low-frequency dielectric loss sensor, which are sleeved outside the insulating sleeve, and an annular high-frequency partial discharge sensor is provided in the annular insulating cylinder.

[0011] A signal lead-out hole is opened on the side wall of the metal shell, and an interface end cover is movably arranged at the corresponding position; the aviation plug interface is fixed at the signal lead-out hole position of the metal shell, and the wiring terminal of the aviation plug interface is located in the metal shell, wherein the high-frequency signal wiring terminal is connected to the high-frequency partial discharge sensor, and the low-frequency signal wiring terminal is connected to the low-frequency dielectric loss sensor; the interface end cover protects the aviation plug interface.

[0012] When conducting detection and monitoring tests of high-frequency and low-frequency current signals on live bushings, keep the end screen cover unchanged, unscrew the interface cover, connect the detection (monitoring) equipment to the aviation plug interface, and then conduct the test. When the interface is not in use, cover the interface cover and seal it. When the power is turned off for routine status inspection tests or preventive tests, keep the interface cover unchanged, remove the end screen cover, and collect signals through the end screen core for testing.

[0013] The utility model does not change the original style of the casing flange. The core of the casing end screen is lengthened to match the inner cavity length of the signal acquisition device. The end screen cover adopts spring contacts for reliable contact, and does not change the original grounding method. The built-in high-frequency partial discharge sensor and low-frequency dielectric loss sensor are convenient for detecting the high-frequency partial discharge of the casing, the end screen grounding current and other signals. The end screen cover of the utility model is provided with spring contacts, which makes the grounding of the end screen lead core more stable and reliable; the disassembly and installation during the test are simple and convenient; the original grounding path is not changed, and the signal attenuation is small; the signal acquisition device has a sealed structure, excellent shielding performance, and good anti-interference performance. The utility model greatly reduces the number of disassembly times during the test process, avoids equipment wear, poor grounding, air leakage, and oil leakage caused by frequent disassembly; and greatly improves the reliability and safety of the casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall appearance of the utility model;

[0015] Figure 2 It is a schematic diagram of the internal structure of the utility model. DETAILED DESCRIPTION

[0016] like Figure 1 and 2 As shown, a bushing flange with a built-in signal acquisition device in an end screen includes a flange body 1 for connecting an upper porcelain sleeve and a lower porcelain sleeve of a high-voltage bushing, a side wall of the flange body 1 is provided with an end screen seat 2, the end screen seat 2 and the flange body 1 are an integral structure, and a signal acquisition device is provided on the end screen seat 2. The specific structure is as follows:

[0017] A cylindrical groove is formed in the center of the end screen seat 2, the side wall of the groove is threaded, and a through hole is formed in the bottom surface of the groove. An insulating porcelain sleeve 4 is arranged in the groove, a part of which extends into the through hole, and the middle part of the insulating porcelain sleeve 4 is an annular protrusion along the circumference, and the protrusion is sealed with the bottom surface of the groove by a sealing ring, and a core pressing copper sleeve 5 is arranged on the other side, and the core pressing copper sleeve 5 is threadedly connected with the groove, and the insulating porcelain sleeve 4 is pressed tightly in the groove by the core pressing copper sleeve 5. The end screen core 3 passes through the center of the insulating porcelain sleeve 4 and is fixedly connected with the insulating porcelain sleeve 4, and one end of the end screen core 3 together with a part of the insulating porcelain sleeve passes through the through hole and extends into the flange body, and the end screen core 3 is connected and conducted with the capacitor end screen in the flange body. The end screen core 3, the insulating porcelain sleeve 4, the core pressing copper sleeve 5 and the groove are coaxially arranged.

[0018] The signal acquisition device includes a metal shell 6, which is a three-way structure. One end face of the metal shell 6 is an open end. The open end is fixedly connected to the end screen seat 2 by screws and sealed by a sealing ring to ensure the stability of the connection and relatively convenient disassembly. A terminal screen core through-hole is opened in the center of the other end face of the metal shell 6. An insulating sleeve 7 is arranged in the metal shell 6, and one end of the insulating sleeve 7 is fixed to the terminal screen core through-hole. A terminal screen cover 8 is movably arranged on the end face of the metal shell 6. A terminal screen core slot 9 is opened on the terminal screen cover 8 corresponding to the terminal screen core through-hole position, and a spring contact finger 10 is arranged on the inner wall circumference of the terminal screen core slot 9. The terminal screen core 3 is arranged through the insulating sleeve 7, and the other end of the terminal screen core 3 is arranged in the terminal screen core slot 9, and is connected to the terminal screen cover 8 through the spring contact finger 10 to ensure contact reliability.

[0019] An annular insulating cylinder 11 is arranged inside the metal shell 6. The annular insulating cylinder 11 includes a cylindrical inner insulating plate and an outer insulating plate. The two ends of the inner insulating plate and the outer insulating plate are closed by an annular insulating plate. The inner insulating plate, the outer insulating plate and the two annular insulating plates enclose an annular insulating cavity. The annular insulating cylinder 11 is sleeved outside the insulating sleeve 7. An annular high-frequency partial discharge sensor 12 is arranged inside the annular insulating cavity. An annular low-frequency dielectric loss sensor 13 is arranged inside the metal shell 6. The low-frequency dielectric loss sensor 13 is sleeved outside the insulating sleeve 7.

[0020] The side wall of the metal shell 6 is provided with a signal lead-out hole, and an interface end cover 14 is movably provided at the corresponding position. The aviation plug interface 15 is fixed at the signal lead-out hole position of the metal shell 6, and the wiring terminal of the aviation plug interface 15 is located inside the metal shell 6, wherein the high-frequency signal wiring terminal is connected to the high-frequency partial discharge sensor 12, and the low-frequency signal wiring terminal is connected to the low-frequency dielectric loss sensor 13, and the interface end cover 14 protects the aviation plug interface 15. When the aviation plug interface does not need wiring work, the interface end cover is covered to seal against dust and water, and at the same time, it can shield the interference of external signals.

[0021] When conducting high-frequency partial discharge signal and low-frequency signal inspection (monitoring) tests, unscrew the interface end cover 14, connect the external inspection (monitoring) equipment to the aviation plug interface 15, and collect relevant signals through the high-frequency partial discharge sensor 12 and the low-frequency dielectric loss sensor 13 to conduct high-frequency partial discharge and low-frequency current and dielectric loss inspection (monitoring). At this time, the end screen cover 8 is connected to the metal shell 6 of the signal acquisition device and the end screen seat 2 to maintain reliable grounding. After the test, screw on the interface end cover 14. When the power is off for routine status inspection tests or preventive tests, such as dielectric loss measurement, pulse current signal measurement, and insulation resistance measurement tests, remove the end screen cover 8 and connect the external detector to the end screen core 3 to collect signals for testing.

Claims

1. The casing flange of the end screen with a built-in signal collection device includes a flange body and a signal collection device, and is characterized in that: The side wall of the flange body is provided with a terminal screen seat, the terminal screen seat and the flange body are an integrated structure, and the signal acquisition device is arranged on the terminal screen seat; A cylindrical groove is formed in the center of the end screen seat, the side wall of the groove is threaded, and a through hole is formed in the bottom surface of the groove; an insulating porcelain sleeve is arranged in the groove, and a ring-shaped protrusion is formed in the middle part of the insulating porcelain sleeve along the circumference, one side of the protrusion is connected to the bottom surface of the groove, and a core pressing copper sleeve is arranged on the other side, and the core pressing copper sleeve is threadedly connected to the groove, and the insulating porcelain sleeve is pressed tightly in the groove through the core pressing copper sleeve; the end screen core passes through the center of the insulating porcelain sleeve and is fixedly connected to the insulating porcelain sleeve, one end of the end screen core and a part of the insulating porcelain sleeve pass through the through hole and extend into the flange body, and the end screen core is connected and conducted with the capacitor end screen in the flange body; the end screen core, the insulating porcelain sleeve, the core pressing copper sleeve and the groove are coaxially arranged; The signal acquisition device comprises a metal shell, one end face of the metal shell is an open end, and the open end is fixedly connected to the end screen seat; a terminal screen core through hole is opened at the center of the other end face of the metal shell, an insulating sleeve is arranged in the metal shell, and one end of the insulating sleeve is fixed to the terminal screen core through hole; a terminal screen cover is movably arranged on the end face of the metal shell, and a terminal screen core slot is opened at the position of the terminal screen core through hole of the terminal screen cover, and a spring contact finger is arranged on the inner wall circumference of the terminal screen core slot; the terminal screen core is arranged through the insulating sleeve, and the other end of the terminal screen core is arranged in the terminal screen core slot, and is connected with the terminal screen cover through the spring contact finger; A circular insulating cylinder and a circular low-frequency dielectric loss sensor are arranged in the metal shell, the circular insulating cylinder and the circular low-frequency dielectric loss sensor are sleeved outside the insulating sleeve, and a circular high-frequency partial discharge sensor is arranged in the circular insulating cylinder; A signal lead-out hole is opened on the side wall of the metal shell, and an interface end cover is movably arranged at the corresponding position; the aviation plug interface is fixed at the signal lead-out hole position of the metal shell, and the wiring terminal of the aviation plug interface is located in the metal shell, wherein the high-frequency signal wiring terminal is connected to the high-frequency partial discharge sensor, and the low-frequency signal wiring terminal is connected to the low-frequency dielectric loss sensor; the interface end cover protects the aviation plug interface.

2. The sleeve flange of the end screen built-in signal acquisition device as claimed in claim 1, characterized in that: The open end of the metal shell is fixedly connected to the end screen seat by screws and sealed by a sealing ring.

3. The sleeve flange of the end screen built-in signal acquisition device as claimed in claim 1, characterized in that: The insulating porcelain sleeve and the bottom surface of the groove are sealed by a sealing ring.

4. The sleeve flange of the end screen built-in signal acquisition device as claimed in claim 1, characterized in that: The annular insulating cylinder includes a cylindrical inner insulating plate and an outer insulating plate. Both ends of the inner insulating plate and the outer insulating plate are closed by annular insulating plates. The inner insulating plate, the outer insulating plate and the two annular insulating plates enclose an annular insulating cavity. The high-frequency partial discharge sensor is arranged in the annular insulating cavity.

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