CN104483518B - High-voltage connection line used for electrical equipment detection - Google Patents

Abstract

The invention relates to a high-voltage connection line used for electric equipment detection. The invention comprises a high-voltage lead wire, a high-voltage shielding plug and a clamp, and the two ends of the high-voltage lead wire are respectively connected with the high-voltage shielding plug and the clamp; the high-voltage lead wire is designed with double shielding layers. The high-voltage shielded plug includes a shielded plug, a plug lock nut, a shielded sleeve, a shielded joint, a protective sleeve, a lead wire holding sleeve, and a holding nut. The plug lock nut is movably placed outside the shielding plug, the upper part of the shielding sleeve is threaded with the shielding plug, the lower part is threaded with the protective sleeve, and the shielding joint is welded at the tail of the shielding sleeve. The shielding plug, shielding sleeve and shielding joint It surrounds a wiring cavity, and the terminal post is located in the wiring cavity. The high-voltage lead wire is connected to the two binding posts correspondingly, and the shielding sleeve and the shielding joint are used as the extension of the outer shielding layer of the high-voltage lead wire to realize full shielding. The invention has a good shielding effect and ensures high-quality, reliable and stable operation status of the host equipment.

Description

A high-voltage connection line for electric equipment detection

technical field

The invention belongs to the technical field of electric equipment measurement, and relates to a high-voltage connection line used for electric equipment measuring instruments.

Background technique

At present, in the detection of power transformers, some detection items need to apply high voltage, and some detection items need to apply low voltage. The high-voltage detection project of power transformers is mainly aimed at its insulation performance. The insulation performance of high-voltage detection circuits (mainly detection circuits and high-voltage leads) and surrounding objects or the earth will have a significant impact on high-voltage detection. A better treatment method is to add a layer of metal shielding layer that has the same potential as the high-voltage measurement circuit but is insulated outside the high-voltage detection circuit, so that the leakage of high voltage to low voltage or the earth is isolated from the detection circuit. When carrying out high-voltage testing projects, because the high-voltage lead wires and high-voltage plugs are affected by the conduction of high-voltage and high-current and the surrounding test environment, it will be difficult for the host equipment of the high-voltage power supply to obtain high-quality, reliable and stable operating conditions; and the high-voltage connection The line needs to transmit high voltage of tens of thousands of volts to hundreds of thousands of volts and high current of hundreds of amps to thousands of amps. Its structure and transmission connection have special requirements. Therefore, it is necessary to provide a High-voltage leads and high-voltage shielded joints with good shielding effect are required. At present, there is no high-voltage connecting line product suitable for power transformer detection and shielding characteristics available in the market.

Contents of the invention

The purpose of the present invention is to provide a high-voltage connecting wire used for electric equipment measuring instruments.

The invention includes a high-voltage lead wire, a high-voltage shielding plug and a fixture. One end of the high-voltage lead wire is connected to the high-voltage shielding plug, and the other end is connected to the clamp; , high-voltage shielding layer, middle insulating layer, outer shielding layer, outer insulating layer, and protective layer; the core wire of the high-voltage lead wire is a metal wire as a high-voltage wire; the high-voltage shielding layer is a metal mesh to realize high-voltage shielding; the outer shielding layer is Metal mesh to strengthen the shielding function; the inner insulating layer, the middle insulating layer and the outer insulating layer are made of non-metallic materials, the inner insulating layer is used for the insulation of the core wire and the high-voltage shielding layer, and the middle insulating layer is used for the insulation of the high-voltage shielding layer and the outer shielding layer Insulation, the outer insulating layer is used for the overall insulation protection of the high-voltage lead; the protective layer is a non-metallic material, used for the outer layer protection of the high-voltage lead.

The high-voltage shielded plug includes a shielded plug, a plug lock nut, a shielded sleeve, a shielded joint, a protective sleeve, a lead wire holding sleeve, and a holding nut.

The shielded plug includes a plug shell, an insulating plug and a high-voltage pin; the plug shell is cylindrical with two ends open, the insulating plug is a cylinder of rubber material, and the insulating plug is arranged in the plug shell; the high-voltage pin passes through the insulating Plug setting, the middle part of the high-voltage pin is fixed in the insulating plug, the head protrudes from the insulating plug, and is located in the plug shell as a pin contact, and the tail of the high-voltage pin is used as a terminal.

The plug lock nut is in the shape of a cylinder with both ends open, and the inner wall is tapped with a locking internal thread. The plug lock nut is movably sleeved outside the shielding plug and can move axially within a limited range.

The shielding sleeve is a metal cylinder with two ends open, and the upper part of the shielding sleeve is threadedly connected with the lower part of the plug shell.

The shielding joint is a cylindrical metal piece with a core wire perforation in the middle, and one end of the shielding joint is welded to the tail of the shielding sleeve to conduct with the shielding sleeve.

The protective sleeve is a non-metallic cylinder with both ends open, and the interior is divided into the shielding sleeve wrapping part, the shielding sleeve connecting part, and the lead wire holding sleeve connecting part along the axial direction; wherein, the shielding sleeve connecting part It is threadedly connected with the lower part of the shielding sleeve, and after the connection, the wrapping part of the shielding sleeve is covered outside the shielding sleeve.

The lead wire holding sleeve is a non-metallic cylinder with both ends open, its upper part is threadedly connected with the lead wire holding sleeve connecting part of the protective sleeve, and the outer wall of the lower part is evenly divided into shrinkable pieces along the axial direction; the holding nut Threaded connection with the lower part of the lead wire holding sleeve;

One end of the high-voltage lead wire is set through the lead wire holding sleeve, the cylindrical outer shielding layer stripped from one end of the high-voltage lead wire is welded to the other end of the shielding joint of the high-voltage shielding plug, and the end of the core wire and the end of the high-voltage shielding layer are passed through The core wire of the shielded joint is perforated and connected to the two terminals in the wiring cavity respectively; after the tightening nut is tightened, the shrinkage piece shrinks inward along the radial direction of the lead wire holding sleeve to hold the high voltage lead wire tightly , to avoid moving back and forth. At the other end of the high-voltage lead wire, the core wire and the high-voltage shielding layer are respectively connected to the two terminals of the fixture, and the outer shielding layer is suspended.

The shielding plug, insulating plug, shielding sleeve and shielding joint enclose a wiring cavity, and the terminal is located in the wiring cavity.

The outer wall of the plug housing is provided with an insulating plug mounting groove along the circumference, and the outer wall of the insulating plug is embedded in the insulating plug mounting groove.

The outer wall of the plug housing is provided with an annular limiting outer boss along the circumference, the inner wall of the plug lock nut is provided with an annular limiting inner boss along the circumference, and the outer wall of the shielding sleeve is provided with an annular positioning boss along the circumference. The limiting inner boss is located between the limiting outer boss and the positioning boss, and the plug lock nut moves axially under the restriction of the three bosses.

A screw hole is formed on the positioning boss through the shielding sleeve, and the shielding plug is connected to the shielding sleeve and fastened by fastening screws.

The inner diameter and length of the shielding sleeve wrapping part of the protective sleeve match the outer diameter and width of the positioning boss of the shielding sleeve, and the positioning boss of the shielding sleeve is located in the shielding sleeve wrapping part.

The shielding sleeve and the shielding joint are used as the extension of the outer shielding layer of the high-voltage lead wire to realize full shielding.

When in use, the pin contacts of the shielded plug are inserted into the multi-core high-voltage socket to complete the conduction connection, and the plug lock nut is used to lock the high-voltage shielded plug and the multi-core high-voltage socket. One end can be connected to the power equipment, so as to realize the conduction connection of the high voltage detection line, and then complete the application of low and high voltage test current and voltage of the transformer bushing terminal, and the collection of signals.

The invention can withstand high voltage and high current, and has a good shielding effect. It is used for connecting high-voltage lead wires with detection equipment, ensuring high-quality, reliable and stable operation of the host equipment of high-voltage power supplies, and avoiding high-voltage leakage of the detection circuit. And the influence of the test environment to ensure the detection accuracy.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is the schematic cross-sectional view of high-voltage lead wire in the present invention;

Fig. 3 is a schematic diagram of the overall structure of the medium and high voltage shielding plug of the present invention;

Fig. 4 is a schematic structural diagram of the shielding plug and the plug locking nut in Fig. 3;

Fig. 5 is a schematic structural diagram of a shielding sleeve and a shielding joint in Fig. 3;

Fig. 6 is a schematic structural diagram of the wiring cavity in Fig. 3;

FIG. 7 is a structural schematic diagram of the protective sleeve and the wire-holding sleeve in FIG. 3 .

detailed description

As shown in Fig. 1, a high-voltage connection line used for electric equipment detection includes a high-voltage lead wire I, a high-voltage shielded plug II and a clamp III. One end of the high-voltage lead wire I is connected to the high-voltage shielding plug II, and the other end is connected to the clamp III.

As shown in Figure 2, the high-voltage lead wire I adopts a double-shielding design, which includes core wire 11, inner insulating layer 12, high-voltage shielding layer 13, middle insulating layer 14, outer shielding layer 15, outer insulating layer 16, protective Layer 17; wherein the core wire 11 is a metal wire as a high-voltage wire; the high-voltage shielding layer 13 is a metal mesh to realize high-voltage shielding; the outer shielding layer 15 is a metal mesh to realize a shielding function; the inner insulating layer 12, the middle insulating layer 14 and the outer insulating layer Layer 16 is a non-metallic material, such as polyester, etc., the inner insulating layer 12 is used for the insulation of the core wire 11 and the high-voltage shielding layer 13, the middle insulating layer 14 is used for the insulation of the high-voltage shielding layer 13 and the outer shielding layer 15, and the outer insulating layer 16 is used for the overall insulation protection of the high-voltage lead; the protective layer 17 is made of non-metallic materials, such as polyester, rubber, etc., and is used for the outer layer protection of the high-voltage lead.

As shown in Figure 3, the high-voltage shielded plug II includes a shielded plug 1, a plug lock nut 2, a shielded sleeve 3, a shielded joint 4, a protective sleeve 5, a lead wire holding sleeve 6, and a holding nut 7.

As shown in FIG. 4 , the shielded plug 1 includes a plug shell 1-1, an insulating plug 1-2 and a high voltage pin 1-3.

The plug shell 1-1 is cylindrical with both ends open, and the plug shell 1-1 is provided with an insulating plug installation groove 1-1-1 along the circumference, and the outer wall of the plug shell 1-1 is provided with a ring-shaped limiting protrusion along the circumference Platform 1-1-2, the lower part of the outer wall of the plug housing 1-1 is tapped with a connecting external thread 1-1-3.

The insulating plug 1-2 is a cylinder of rubber material, and the outer wall of the insulating plug 1-2 is embedded in the insulating plug mounting groove 1-1-1.

The high-voltage pin 1-3 is set through the insulating plug 1-2, the middle part of the high-voltage pin 1-3 is fixed in the insulating plug 1-2, and the head protrudes out of the insulating plug 1-2 as a pin contact 1-3 -1 is located inside the plug housing 1-1.

The plug lock nut 2 is cylindrical with both ends open, and the inner wall of the plug lock nut 2 is provided with an annular limiting inner boss 2-1 along the circumference, and the inner wall of the plug lock nut 2 is tapped with a locking internal thread 2-2; the movable sleeve of the plug lock nut 2 is placed outside the shielding plug 1, and is limited by the limiting inner boss 2-1 and the limiting outer boss 1-1-2.

As shown in Figure 5, the shielding sleeve 3 is a metal cylinder with open ends, and the outer wall of the shielding sleeve 3 is provided with an annular positioning boss 3-1 along the circumference; The connection internal thread 3-2 matched with the connection external thread 1-1-3; the lower part of the outer wall of the shielding sleeve 3 is tapped with the shielding sleeve external thread 3-3; the positioning boss 3-1 penetrates the shielding sleeve 3 and has a Screw holes 3-4, the shielding plug 1 is connected to the shielding sleeve 3 and fastened by fastening screws 3-5.

The shielding connector 4 is a cylindrical metal piece with a core wire hole 4-1 in the middle, and one end of the shielding connector 4 is welded to the tail of the shielding sleeve 3 to conduct with the shielding sleeve 3 .

As shown in Figure 6, the shielding plug 1 and the shielding sleeve 3 are threadedly connected by connecting the external thread 1-1-3 and connecting the internal thread 3-2, the shielding plug 1, the insulating plug 1-2, the shielding sleeve 3 and the shielding connector 4 surrounds the synthetic wiring chamber 8, and the tail of the high-voltage pin 1-3 is located in the wiring chamber 8 as the terminal 1-3-2.

As shown in Figure 7, the protective sleeve 5 is a non-metallic cylinder with both ends open. The tight sleeve connection part 5-3; the inner diameter and length of the shielding sleeve wrapping part 5-1 match the outer diameter and width of the positioning boss 3-1 of the shielding sleeve 3; the inner side of the shielding sleeve connecting part 5-2 The wall tap has a protective sleeve internal thread 5-4 that matches the external thread 3-3 of the shielding sleeve. The protective sleeve 5 is threadedly connected to the shielding sleeve 3. After the connection, the positioning boss 3-1 of the shielding sleeve 3 is located on the shielding sleeve. The sleeve wraps inside the part 5-1.

The lead wire holding sleeve 6 is a non-metallic cylinder with open ends, its upper part is threadedly connected with the protective sleeve 5, and the outer wall of the lower part is evenly divided into shrinkable pieces 6-1 along the axial direction; the holding nut 7 is connected with the lead wire The lower part of the clamping sleeve 6 is threaded, and after tightening, the contraction sheet 6-1 shrinks inward along the radial direction of the lead clamping sleeve 6, so that the high-voltage lead is clamped tightly to prevent forward and backward movement and achieve a fixing effect.

One end of the high voltage lead wire is set through the lead wire holding sleeve 6, and the holding nut 7 is tightened to prevent the high voltage lead wire from moving back and forth. The cylindrical outer shielding layer 15 stripped from the high-voltage lead wire is welded to the other end of the shielding joint 4 of the high-voltage shielding plug, and the end of the core wire 11 of the high-voltage lead wire and the end of the high-voltage shielding layer 13 pass through the core wire perforation of the shielding joint 4 4-1, and are connected to the two terminal posts 1-3-2 in the wiring cavity 8 correspondingly. The shielding sleeve 3 and the shielding connector 4 are used as the extension of the outer shielding layer 15 of the high-voltage lead wire to realize full shielding.

At the other end of the high-voltage lead wire, the core wire 11 and the high-voltage shielding layer 13 are respectively connected to the two terminal pins of the fixture III, and the outer shielding layer 15 is suspended. Fixture III can take various forms, such as power clamps and so on.

In use, the pin contacts of the shielding plug 1 are inserted into the multi-core high-voltage socket to complete the conduction connection, and the plug lock nut 2 is used to lock the high-voltage shielding plug and the multi-core high-voltage socket. Ⅲ Just connect to the power equipment, so as to realize the conduction connection of the high voltage detection line, and then complete the application of low and high voltage test current and voltage of the transformer bushing terminal, and the collection of signals. Among them, during the low-voltage measurement test, the core wire 11 is used as a voltage wire, the high-voltage shielding layer 13 is used as a current wire, and the outer shielding layer 15 realizes the shielding function; The double shielding effect is realized, the high-voltage shielding layer 13 realizes the high-voltage shielding function, and the outer shielding layer 15 strengthens the shielding effect.

Claims (8)

1. a kind of high-pressure connection line for electric device maintenance, including high-voltage connection, high-tension shielding plug and fixture, high pressure draws Line is designed using double shield layer, and one end of high-voltage connection is connected with high-tension shielding plug, and the other end is connected with fixture；Its feature exists In：Described high-voltage connection includes respectively from inside to outside heart yearn (11), inner insulating layer (12), high voltage shield (13), middle insulation Layer (14), external shielding layer (15), external insulation layer (16), protective layer (17)；

Described high-tension shielding plug includes shielded plug (1), plug-locking nut (2), shroud sleeve (3), shielded joint (4) sleeve (5), lead, is protected to hold sleeve (6) tightly, hold nut (7) tightly；

Described shielded plug (1) includes plug body (1-1), insulating plug (1-2) and high pressure contact pin (1-3)；Plug body (1- 1) it is the cylindrical shape of both ends open, insulating plug (1-2) is the cylinder of elastomeric material, insulating plug (1-2) is arranged on plug body (1-1) in；High pressure contact pin (1-3) is arranged through insulating plug (1-2), and insulating plug (1-2) is fixed in the middle part of high pressure contact pin (1-3) Interior, head stretches out insulating plug (1-2), is located in plug body (1-1) as pin contact (1-3-1), high pressure contact pin (1-3) Afterbody is used as binding post (1-3-2)；

Described plug-locking nut (2) for both ends open cylindrical shape, plug-locking nut (2) inwall be tapped with lock female thread (2-2), plug-locking nut (2) activity is placed on shielded plug (1) outward, can be axially moveable in the range of restriction；

Described shroud sleeve (3) for both ends open metallic cylinder, the top of shroud sleeve (3) and plug body (1-1) Lower thread connects；

Described shielded joint (4) is cylindrical metal part, and centre is provided with heart yearn perforation (4-1), one end weldering of shielded joint (4) The afterbody of shroud sleeve (3) is connected on, with shroud sleeve (3) conducting；

Described protection sleeve (5) is the nonmetallic cylinder of both ends open, is axially inside divided into shroud sleeve parcel (5-1), shroud sleeve coupling part (5-2), lead is divided to hold sleeve connection part (5-3) tightly；Wherein, shroud sleeve coupling part (5-2) it is connected with the lower thread of shroud sleeve (3), shroud sleeve wrapping portion (5-1) is coated on shroud sleeve (3) after connection Outward；

Described lead holds nonmetallic cylinder of the sleeve (6) for both ends open tightly, and its top is held tightly with the lead of protection sleeve (5) Sleeve connection part (5-3) is threadedly coupled, and the outer wall of bottom is evenly divided into vertically contraction piece (6-1)；Hold tightly nut (7) with Lead holds the lower thread connection of sleeve (6) tightly；

One end of high-voltage connection is held sleeve (6) tightly and is arranged through lead, the cylindric external shielding layer that high-voltage connection one end separates (15) with the other end welding of the shielded joint (4) of high-tension shielding plug, the end of heart yearn (11) and high voltage shield (13) End is bored a hole (4-1) through the heart yearn of shielded joint (4), and corresponding with two binding posts (1-3-2) in wire connection cavity (8) respectively Conducting connection；Hold nut (7) tightly and screw the radially-inwardly contraction that after-contraction piece (6-1) holds sleeve (6) tightly along lead, high pressure is drawn Line is held tightly, it is to avoid movable；

In two end feet of the other end of high-voltage connection, heart yearn (11) and high voltage shield (13) difference jockey, external shield Layer (15) is hanging.

2. a kind of high-pressure connection line for electric device maintenance as claimed in claim 1, it is characterised in that：Described high pressure Heart yearn (11) is metal wire in lead, used as high-voltage line；High voltage shield (13) is wire netting, realizes high-tension shielding；External shield Layer (15) is wire netting, strengthens function of shielding；Inner insulating layer (12), middle insulating barrier (14) and external insulation layer (16) are non-metallic material Material, inner insulating layer (12) for heart yearn (11) and high voltage shield (13) insulation, middle insulating barrier (14) is for high voltage shield (13) with the insulation of external shielding layer (15), external insulation layer (16) is for the overall insulation protection of high-voltage connection；Protective layer (17) is Nonmetallic materials, for the outer layer protection of high-voltage connection.

3. a kind of high-pressure connection line for electric device maintenance as claimed in claim 1, it is characterised in that：Described shielding Plug (1), insulating plug (1-2), shroud sleeve (3) and shielded joint (4) enclose wire connection cavity (8), and binding post (1-3-2) is located at In wire connection cavity (8).

4. a kind of high-pressure connection line for electric device maintenance as claimed in claim 1, it is characterised in that：Described plug Insulating plug mounting groove (1-1-1) is circumferentially provided with shell (1-1), the outer wall of insulating plug (1-2) is embedded in insulating plug mounting groove (1- In 1-1).

5. a kind of high-pressure connection line for electric device maintenance as claimed in claim 1, it is characterised in that：Described plug Shell (1-1) outer wall is circumferentially provided with the spacing outer lug boss (1-1-2) of annular, and plug-locking nut (2) inwall circumferentially sets The spacing inner convex platform (2-1) of annular is equipped with, the outer wall of shroud sleeve (3) is circumferentially provided with the positioning boss (3-1) of annular, limit Position inner convex platform (2-1) is located between spacing outer lug boss (1-1-2) and positioning boss (3-1), and plug-locking nut (2) is convex at three It is axially moveable under the restriction of platform.

6. a kind of high-pressure connection line for electric device maintenance as claimed in claim 5, it is characterised in that：Described positioning Screw hole (3-4) is provided with through shroud sleeve (3) on boss (3-1), shielded plug (1) passes through after being connected with shroud sleeve (3) Fastening screw (3-5) is fastened.

7. a kind of high-pressure connection line for electric device maintenance as claimed in claim 1, it is characterised in that：Described protection The internal diameter and length of the shroud sleeve wrapping portion (5-1) of sleeve (5) and the external diameter of shroud sleeve (3) positioning boss (3-1) and Width is matched, and the positioning boss (3-1) of shroud sleeve (3) is located in shroud sleeve wrapping portion (5-1).

8. a kind of high-pressure connection line for electric device maintenance as described in claim 1-7 is arbitrary, it is characterised in that：It is described Shroud sleeve (3) and shielded joint (4) as the extension of the external shielding layer (15) of high-voltage connection, realize full-shield.