DE202020004875U1 - Special elbow-shaped connection for live repair of a power cable and repair device - Google Patents

Abstract

A special elbow-shaped connector (1) for the current-carrying repair of a power cable, characterized in that it comprises an elbow-shaped insulation housing (1-1), a liquid injection connection arrangement arranged on one side of the elbow-shaped insulation housing, and a conductive arrangement; wherein the interior of the elbow-shaped insulation housing forms as a hollow structure an elbow-shaped cavity for receiving the conductive arrangement; and wherein the conductive assembly comprises a conductive rod (1-2) for electrical connection to the cable terminal of live equipment and a crimp terminal (1-3) for electrical connection to a cable to be repaired, and wherein the conductive rod is connected to the crimp terminal and is arranged in the elbow-shaped cavity of the housing, and wherein the free connecting ends of the conductive rod and the crimp terminal each face two outlet directions of the elbow-shaped cavity; and wherein the liquid injection port arrangement comprises a liquid injection port (1-4) arranged on one side of the elbow-shaped insulating housing and a cap (1-5) used to match it, and wherein on the inside of the liquid injection port (1-4) a liquid injection channel (1-4 -1) is formed, which extends to the crimp terminal.

Description

TECHNICAL AREA

The present utility model relates to the technical field of repairing power cables and a current-carrying repair technology for power cables, the insulation of which deteriorates after long-term use, and in particular a special elbow-shaped connector for current-carrying repair of a power cable and a device for current-carrying repair of a power cable.

STATE OF THE ART

Cross-linked polyethylene (XLPE) power cables have superior electrical properties, mechanical properties and heat resistance, making them widely used in the construction of urban power grids.

In the past, the cable manufacturing process and waterproof performance were not good. Some local defects inevitably occur in the insulation layer during production, transportation and operation. The moisture, which enters the XLPE insulation through various channels, collects at the micro-defects under the action of the electric field, which leads to the formation of a water tree. Under the effect of the overvoltage, the top of the water tree can easily cause an electric tree, which can further lead to breakdown of the cable insulation body. With the increase in cable service years, the aging problem of urban cables in China is becoming more serious. Although the water tree resistance of cables has been greatly improved in recent years, the aging problem still plagues the power department, moreover, most of the early aging cables are buried underground and concentrated in the city center, and the direct replacement of the aging cable requires a large amount of engineering and cause enormous costs. Therefore, cable repair technology is used to repair the local aging area of the cable, thereby extending the life of the cable, thus saving many human and material resources, which is of practical importance

XLPE cable repair technology has a history of more than 30 years in the world. Previously, people tried to inject dry nitrogen and acetophenone into the cable core, but the repair effect was not ideal and the economic benefit was not high; Later, people discovered the unique role of siloxane in the field of cable repair, under the action of the catalyst, siloxane can consume the moisture in the cable insulation layer through the hydrolysis condensation reaction and create oligomers to fill the water tree cave, thereby achieving the purpose of extending the life of the cable becomes. So far, Novinium from the USA has developed two generations of repair fluids based on the repair principle of siloxane. The first generation is the 841 technology which can effectively extend the life of the cable by 10 to 15 years, the second generation the 732/733 technology which improves the siloxane and catalyst formula, using voltage stabilizer, antioxidant and other additives for inhibition added to the partial discharge so that the performance becomes more superior.

In order to reliably inject the repair fluid into the cable core, a special connection adapter is required to connect the cable head and the injection device. The US patent US7658629B2 discloses a cable connection accessory suitable for cables connected to other power components by copper noses. If the cables are connected to control cabinets, box-type transformer stations, etc. via an elbow-shaped connection, this method is not applicable. The US patent US7538274B2 discloses a high voltage connector. Before using the connector, the inter-cable connector should be removed and then the two cables attached to the connector. The injection process can be completed by injecting into the pipeline. A higher pressure can be withstood to reduce construction time, but unlike the previous US patent, the injection process requires power outages. The US patent US7331806B2 discloses a cable connector with an internal liquid storage tank. The interior of the connector is designed as a multi-cavity structure,
and the time for the repair fluid to pass through the cable is lengthened, moreover, the impact of the external environment on the repair fluid process can be reduced; however, this construction has a complex internal structure, high production costs, high prices and complex repair methods, so the technology is difficult to spread.

Cable repair technology in China is still in the early stages. The patent application document with the application number CN200410072791.5 discloses an injection system of repair fluid for power cables, the repair process of this patent requires a total power failure and does not explain in detail how to reliably connect the injection device to the cable head. The patent application document with the application number CN201010028136.5 discloses an apparatus for live repair of an XLPE power cord and a live repair method, the adapter is also for use only Suitable cables with copper lugs on their cable heads; if the cables are connected to switch cabinets, box-type transformer stations, etc. via an elbow-shaped connection, this method cannot be used.

CONTENTS OF THE PRESENT USED MODEL

The present utility model aims to provide, with regard to the deficiencies of the prior art, a special ovoid-shaped connection for the current-carrying repair of a power cable in order to establish a connection between the injection device of the repair liquid and the elbow-shaped connection of the cable in order to facilitate the injection of the Complete repair fluid in the event of no power failure.

Another aim of the present utility model is to provide a device based on the above special elbow-shaped connection for the current-carrying repair of a power cable.

Based on an elbow-shaped structure used to connect the power cable to the existing live operating equipment (such as switch cabinets, box-type transformer substations, etc.), a special elbow-shaped connection is developed for the live repair of a power cable, the structure of which is similar, comprising an elbow-shaped insulation housing, a liquid injection port assembly disposed on one side of the elbow-shaped insulation housing and a conductive assembly; wherein the interior of the elbow-shaped insulation housing forms as a hollow structure an elbow-shaped cavity for receiving the conductive arrangement; and wherein the conductive assembly comprises a conductive rod for electrical connection to the cable terminal of live equipment and a crimp terminal for electrical connection to a cable to be repaired, and wherein the conductive rod is connected to the crimp terminal and disposed in the elbow-shaped cavity of the housing, and wherein the free connecting ends of the conductive rod and the crimp terminal each face two outlet directions of the elbow-shaped cavity; and wherein the liquid injection port assembly comprises a liquid injection port disposed on one side of the elbow-shaped insulation housing and a cap used to mate with it, and wherein a liquid injection channel is formed on the inside of the liquid injection port and extends to the crimp terminal. By using the special elbow-shaped connector for live repair of a power cable, the original elbow-shaped connector used on the live operating equipment can be replaced in the repair process of the power cable, in order to carry out an insulation repair of the power cable without affecting the normal operation of the live operating equipment.

In the special elbow-shaped connection for the current-carrying repair of a power cable, the crimp terminal is a tubular conductive element, several inwardly recessed contact elements are arranged on a side wall of it, which form an electrical connection with the cable core of a cable to be repaired inserted into the crimp terminal, and wherein an installation hole of the conductive rod is provided on a side wall of another end of the crimping terminal opposite to the insertion end of the cable core. In this way a good electrical connection can be obtained between the conductive rod and the cable to be repaired in order to ensure normal operation of the live operating equipment.

In the special elbow-shaped connection for the current-carrying repair of a power cable, the conductive arrangement is fixed by an inner semiconducting layer in the chamber of the elbow-shaped insulation housing, the structure of the inner wall of the inner semiconducting layer is matched to the outer shape of the crimp terminal, and on part of the the outer wall of the crimp terminal matched end portion of the inner semiconducting layer has a restricting step which clamps the crimp terminal; In a preferred implementation, the inner surface of the delimiting step is conical along the circumferential direction in order to facilitate the introduction of the cable core. An outer semiconducting layer is arranged on the outside of the elbow-shaped insulation housing, the liquid injection connection and the cap. The inner semiconducting layer and the outer semiconducting layer are each made of conductive rubber. The inner semiconducting layer can effectively control electrical voltage and the outer semiconducting layer mates with the cable shield to provide continuous shielding and ensure that the outer semiconducting layer is in a grounded state.

If the special elbow-shaped connection for the current-carrying repair of a power cable is not used in order to realize a complete sealing of the liquid injection port, an insulation rod is arranged inside the cap, which extends outward from the upper inner wall of the cap and is used for insertion into the liquid injection channel becomes. In In a preferred implementation, the inner wall of the liquid injection channel of the liquid injection port and a corresponding outer side wall of the insulation rod of the cap are designed as a wave-shaped structure, thereby two functions are achieved: (1) the creepage distance from the inside of the special elbow-shaped connection through the liquid injection channel to the outer semiconducting layer is lengthened to inhibit the creep phenomenon; (2) the isolation rod on the cap can be tightly combined with the liquid injection port so that it does not fall off easily.

In order to further improve the robustness of the combination between the cap and the liquid injection port, a delimiting projection is arranged on the inner wall of the cap, a delimiting groove matched to the delimiting projection being provided at a corresponding position on the outer wall of the liquid injection connection.

In the case of the special elbow-shaped connection for the current-carrying repair of a power cable, a pull ring is arranged on the elbow-shaped insulation housing in order to facilitate assembly and disassembly. A grounding eye is also arranged on the elbow-shaped insulation housing in order to establish a connection with the grounding wire.

Based on the above special elbow-shaped connection for the current-carrying repair of a power cable, the present utility model further provides a device for the current-carrying repair of a power cable, comprising a plurality of the above special elbow-shaped connections for the current-carrying repair of a power cable, a repair liquid storage tank, a gas drying tank, an air compressor and a residual liquid collection tank ; wherein the plurality of special elbow-shaped terminals for live repair of a power cable are used to establish a connection between a cable terminal of the live operating equipment and a cable to be repaired; and wherein the repair liquid storage tank, the gas drying tank and the air compressor are successively connected to each other by a pipeline, and wherein the output port of the repair liquid storage tank communicates with a liquid injection port of the elbow-shaped connector connected to one end of the cable to be repaired, and the The input port of the residual liquid collection tank communicates with a liquid injection port of the elbow-shaped port connected to the other end of the cable to be repaired. The number of special elbow-shaped connections used to carry out live repair of a power cable is twice as large as the number of power cables to be repaired.

In the above device for the current-carrying repair of a power cable, a valve is arranged in each case on the pipeline through which the repair liquid storage tank communicates with the liquid injection port of the elbow-shaped connection, and the pipeline through which the residual liquid collection tank communicates with the liquid injection port of the elbow-shaped connection, in order to prevent the inflow and controlling the flow rate of the repair fluid, the valve being a fluid valve.

In the above apparatus for conducting electrical repairing a power cable, when the air compressor is in operation, the compressed air is forced into the gas drying tank by the arranged air tank and compressor, and moisture in the air is absorbed to prevent the water molecules with the repair fluid from entering the cable and thus impair the repair efficiency; the dry air continues to be pressed into the repair fluid storage tank, and the pressure is transferred to the repair fluid, the resulting pressurized repair fluid is injected into the cable core of the power cable through the fluid injection channel of the special elbow-shaped connector.

In the above apparatus for energizing repair of a power cable, in order to control the repair liquid or gas flow rate and ensure the convenience of operation and the safety of the equipment, a pressure gauge, a handle and a liquid level indicator are installed on the repair liquid storage tank, and a handle and on the residual liquid storage tank a safety valve are installed, and a pressure gauge, a handle and a safety valve are installed on the gas drying tank, and an air tank and a pressure gauge are installed on the air compressor. The air compressor and the repair liquid storage tank can adjust the pressure of the compressed air to 0.2-0.8 MPa according to their built-in pressure gauges, so that the flow rate of the repair liquid becomes appropriate to obtain low pressure injection. In the repair liquid storage tank, the remaining amount of the repair liquid can be observed through the liquid level indicator. With the safety valve arranged on the residual liquid collection tank and the gas drying tank, an overflow from the safety valve can be realized when the pressure exceeds the specified range, in order to ensure safety. In addition, the Repair liquid storage tank, an injection port of the repair liquid is provided, when the liquid level indicator shows a low liquid level, the repair liquid can be added to the repair liquid storage tank through the injection port of the repair liquid in time to avoid the normal operation of the repair work of the power cable being impaired. It should be noted in particular that the repair liquid can be any repair liquid for the aging of the cable insulation, the repair device can also be used to inject other gases or liquids into the power cable.

1. 1. bei dem speziellen ellbogenförmigen Anschluss zur stromführenden Reparatur eines Stromkabels gemäß dem vorliegenden Gebrauchsmuster wird durch die in dem ellbogenförmigen Isolationsgehäuse angeordnete leitende Anordnung ein Normalbetrieb des Stromkabels realisiert, gleichzeitig wird durch den an dem ellbogenförmigen Isolationsgehäuse angeordneten Flüssigkeitsspritzanschluss die Reparaturflüssigkeit ins Alterungskabel eingespritzt, dadurch wird die Isolationsreparatur des Alterungskabels ohne Beeinträchtigung des Normalbetriebs des Stromkabels realisiert, um die technische Lücke der stromführenden Reparatur des Kabels mit dem ellbogenförmigen Anschluss zu füllen;
2. 2. der spezielle ellbogenförmige Anschluss zur stromführenden Reparatur eines Stromkabels gemäß dem vorliegenden Gebrauchsmuster verfügt über eine leichte Montage und eine einfache Bedienung, darüber hinaus kann er als ein herkömmlicher ellbogenförmiger Anschluss verwendet werden, dazu ist keine Demontage benötigt, unter Verwendung des speziellen ellbogenförmigen Anschlusses zur Kabelreparatur wird eine hervorragende Kabelreparatureffizienz erzielt, was sich zur verbreiteten Verwendung auf diesem Gebiet eignet;
3. 3. wenn der spezielle ellbogenförmige Anschluss zur stromführenden Reparatur eines Stromkabels gemäß dem vorliegenden Gebrauchsmuster nicht in Betrieb ist, wird die Kappe an dem Flüssigkeitsspritzanschluss installiert, um elektrische Risiken wie Kriechen zu verhindern, Verletzungen der Personen zu vermeiden und den sicheren Betrieb des Stromkabels zu gewährleisten;
4. 4. wenn die Vorrichtung zur stromführenden Reparatur eines Stromkabels gemäß dem vorliegenden Gebrauchsmuster zur Kabelreparatur verwendet wird, kann jedoch ein kurzes Ausschaltmoment auftreten (wenn die stromführende Betriebsausrüstung einen speziellen ellbogenförmigen Anschluss verwendet, besteht das Problem nicht), nach der Installation des ellbogenförmigen Anschlusses kann das Alterungskabel stromführend repariert werden, was die Stromausfallzeit erheblich verkürzt und die Lebensdauer des Kabels verlängert;
5. 5. wenn die Vorrichtung zur stromführenden Reparatur eines Stromkabels gemäß dem vorliegenden Gebrauchsmuster zur Kabelreparatur verwendet wird, selbst wenn ein Verfahren, in dem ein Zwischenschluss besteht und die Reparaturflüssigkeit bei niedrigem Druck ins Alterungskabel eingespritzt wird, zur Reparatur verwendet wird, besteht kein Grund, sich über das Problem mit zu langer Stromausfallszeit zu machen.

Compared to the prior art, the present utility model has the following advantageous effects:

1. 1. With the special elbow-shaped connection for the current-carrying repair of a power cable according to the present utility model, normal operation of the power cable is realized through the conductive arrangement arranged in the elbow-shaped insulation housing, at the same time the repair fluid is injected into the aging cable through the liquid injection connection arranged on the elbow-shaped insulation housing, thereby realizes the insulation repair of the aging cable without impairing the normal operation of the power cable in order to fill the technical gap of the current-carrying repair of the cable with the elbow-shaped connection;
2. 2. The special elbow-shaped connector for the current-carrying repair of a power cable according to the present utility model has easy assembly and simple operation, moreover, it can be used as a conventional elbow-shaped connector, no disassembly is required, using the special elbow-shaped connector for Cable repair excellent cable repair efficiency is achieved, which is suitable for widespread use in this field;
3. 3. When the special elbow-shaped connector for the current-carrying repair of a power cable according to the present utility model is not in operation, the cap is installed on the liquid splash connector in order to prevent electrical risks such as creeping, avoid personal injury and ensure the safe operation of the power cable ;
4. 4. However, when the device for the current-carrying repair of a power cable according to the present utility model is used for cable repair, a brief switch-off moment may occur (if the current-carrying operating equipment uses a special elbow-shaped connector, the problem does not exist), after the installation of the elbow-shaped connector can Aging cables are repaired while they are live, which significantly shortens the power outage time and extends the service life of the cable;
5. 5. If the apparatus for conducting repair of a power cable according to the present utility model is used for cable repair, even if a method in which there is an intermediate circuit and the repair liquid is injected into the aging cable at low pressure is used for repair, there is no need to be to worry about the problem with too long a power outage.

Figure list

• 1 shows a schematic structural view of a special elbow-shaped connection for the current-carrying repair of a power cable according to the present utility model.
• 2 FIG. 11 shows a schematic diagram of the apparatus for the current-carrying repair of a power cable according to the present utility model.

List of reference symbols

1

Special elbow connection

1-1

Elbow-shaped insulation housing

1-2

Leading staff

1-3

Crimp terminal

1-4

Liquid injection port

1-4-1

Liquid injection channel

1-4-2

Boundary groove

1-5

cap

1-5-1

Isolation bar

1-5-2

Limiting lead

1-6

Inner semiconducting layer

1-6-1

Limitation level

1-7

Outer semiconducting layer

1-8

Pull ring

1-9

Ground lug 2 repair fluid storage tank

2-1, 3-1, 4-2

manometer

2-2, 3-2, 5-1

Handle

2-3

Liquid level indicator

3

Gas drying tank

3-3, 5-2

Safety valve

4th

Air compressor

4-1

Air tank

5

Residual liquid collection tank

6th

electric wire

7th

switch cabinet

7-1

Sleeve

7-2

Arc suppression insert

8th

Valve

DETAILED DESCRIPTION

In connection with the embodiments, the present utility model is explained in more detail below; it should be pointed out here that the present embodiment only serves to further explain the present utility model, instead of restricting the scope of protection of the present utility model, and those skilled in the art Area can use the content of the present utility model to carry out some non-essential improvements and adaptations for the present utility model.

Embodiment 1

Special elbow-shaped connection for current-carrying repair of a power cable The present embodiment provides a special elbow-shaped connection 1 for the live repair of a power cable that leads to the control cabinet 7th suitable, available. There is a sleeve on the cable connection terminal of the control cabinet 7-1 installed with a contiguous arc suppression insert in the sleeve 7-2 is arranged.

The structure of the special elbow-shaped connector for conductive repair of a power cable is as in 1 shown comprising an elbow-shaped insulation housing 1-1 , a liquid injection port assembly disposed on one side of the elbow-shaped insulation housing, and a conductive assembly. The interior of the elbow-shaped insulation housing forms, as a hollow structure, an elbow-shaped cavity for receiving the conductive arrangement. The conductive assembly includes a conductive rod 1-2 and a crimp terminal 1-3 , in the present embodiment is the crimp terminal 1-3 designed as a copper tube, with several recesses being provided on the side wall, which are pressed and shaped inward, and where one end of the crimp terminal is an insertion end of the cable core of the cable to be repaired as a contact element, while an installation hole of the senior staff is provided. The leading staff 1-2 is installed in the installation hole of the crimp terminal, with the conductive rod 1-2 and the crimp terminal 1-3 through an inner semiconducting layer 1-6 are fixed in the chamber of the elbow-shaped insulation housing, and wherein the structure of the inner wall of the inner semiconducting layer is matched to the outer shape of the conductive rod and the crimp terminal, and wherein at a part of the end portion of the inner semiconducting layer matched to the outer wall of the crimp terminal a Limitation level 1-6-1 is arranged, which clamps the crimp terminal; and wherein the inner surface of the restricting step is tapered along the circumferential direction to facilitate the insertion of the cable core. The free connecting ends of the conductive rod and the crimp terminal each face two outlet directions of the elbow-shaped cavity. Between the senior staff 1-2 and the inner wall of the elbow-shaped insulation housing is formed with a space for receiving the sleeve, when the special elbow-shaped connection is coupled to the cable connection terminal of the switchgear cabinet, is the conductive rod 1-2 with the arc suppression insert 7-2 electrically connected to establish an electrical connection between the conductive rod and the cable connection terminal of the control cabinet. The length of the crimp terminal 1-3 is smaller than the length of the cavity of the elbow-shaped insulation housing in which the crimp terminal is located in order to form a guide space for guiding the insertion of the cable after the cable protruded into the elbow-shaped insulation housing, its cable core is inserted into the crimp terminal and comes with the Contact element on the inner wall of the crimp terminal in close contact. The liquid injection port arrangement comprises a liquid injection port arranged on one side of the elbow-shaped insulation housing 1-4 and a cap used to match with it 1-5 , being on the inside of the liquid injection port 1-4 a Liquid injection channel 1-4-1 is formed, which extends to the crimp terminal. Inside the cap is an isolation bar 1-5-1 arranged, which extends from the upper inner wall of the cap to the outside and is used for insertion into the liquid injection channel, wherein the inner wall of the liquid injection channel of the liquid injection port and a corresponding outer side of the insulating rod of the cap are formed as a wave-shaped structure. On the inner wall of the cap and at a corresponding position on the outer wall of the liquid injection port, there are each a delimiting projection 1-5-2 and a delimitation groove tailored to it 1-4-2 intended.

There is an outer semiconducting layer on the outside of the elbow-shaped insulation housing, the liquid injection connection and the cap 1-7 arranged. The inner semiconducting layer and the outer semiconducting layer are each made of conductive rubber. The inner semiconducting layer can effectively control electrical voltage and the outer semiconducting layer mates with the cable shield to provide continuous shielding and ensure that the outer semiconducting layer is in a grounded state.

At a corner position of the elbow-shaped insulation housing is a pull ring 1-8 arranged to facilitate assembly and disassembly of the special elbow-shaped connector. There is a grounding eye on the outer semiconducting layer of the elbow-shaped insulation housing 1-9 arranged to connect to the ground wire.

Embodiment 2 Apparatus for current-carrying repair of a power cable Based on the special elbow-shaped connection for current-carrying repair of a power cable in the first embodiment, the present embodiment provides an apparatus for current-carrying repair of a power cable, which is connected to the control cabinet 7th suitable, available. A three-phase cable consists of three cables, with the two ends of the cable each connected to a control cabinet, like a 2 shown.

The structure of the apparatus for conductive repair of a power cable is as in FIG 2 shown, comprising 6 special elbow-shaped connections 1 for the current-carrying repair of a power cable in the exemplary embodiment, further comprising a repair liquid storage tank 2, a gas drying tank 3 , an air compressor 4th and a residual liquid collection tank 5 includes. The special elbow-shaped connection for the live repair of a power cable replaces the original elbow-shaped connection of the three-phase cable in order to establish a connection between the cable connection terminal of the control cabinet and the cable to be repaired. First, the cable is connected to the inside of the elbow-shaped insulation housing of the special elbow-shaped terminal, and the cable core is inserted into the crimp terminal and comes into close contact with the contact element on the inner wall of the crimp terminal, so that the conductive rod and the cable core make good electrical contact . Then the special elbow-shaped connector connected to the cable is installed on the control cabinet so that the sleeve of the cable connection terminal of the control cabinet is inserted into one side of the elbow-shaped insulation housing, and the conductive rod 1-2 on the arc suppression insert 7-2 to establish an electrical connection between the conductive rod and the cable connection terminal of the control cabinet. The repair liquid storage tank 2, the gas drying tank 3 and the air compressor 4th are connected one after the other by a pipeline; wherein the output port of the repair liquid storage tank communicates through a pipeline with a liquid injection port of the elbow-shaped connector connected to one end of the cable to be repaired, and wherein the input port of the residual liquid storage tank with a liquid injection port of the elbow-shaped connector connected to the other end of the cable to be repaired connected, communicates.

A pressure gauge is attached to the repair liquid storage tank 2 2-1 , a handle 2-2 and a liquid level indicator 2-3 installed, and being attached to the gas drying tank 3 a manometer 3-1 , a handle 3-2 and a safety valve 3-3 installed, and being on the air compressor 4th an air tank 4-1 , a manometer 4-2 and a compressor are installed. At the residual liquid collection tank 5 are a handle 5-1 and a safety valve 5-2 Installed. In addition, an injection opening for the repair liquid is also provided on the repair liquid storage tank. On the pipeline through which the repair liquid storage tank 2 communicates with the liquid injection port of the elbow-shaped connector, and the pipeline through which the residual liquid collection tank 5 communicating with the liquid injection port of the elbow-shaped port is a valve in each case 8th arranged to control the inflow and flow rate of the repair fluid. The valve is a liquid valve.

Application example

In the present application example, the apparatus for repairing a power cord in Embodiment 2 is used to perform a live repair of a cable for the control cabinet, the steps being as follows:

(1) Preparations before repair

• (11) Vorbereitungen für Stromausfall und Sicherheit, Durchführen von Stromausfallverfahren und anderen Vorbereitungen in strikter Übereinstimmung mit den einschlägigen Systemen auf diesem Gebiet (z.B. Durchführen elektrischer Inspektionen vor dem Kontakt mit der Ausrüstung, Aufstellen von Zäunen, Hängen von Schildern usw.), um eine sichere und ordnungsgemäße Reparaturkonstruktion zu gewährleisten;
• (12) Isolationstest nach Stromausfall, Entfernen des dreiphasigen Kabels von der stromführenden Betriebsausrüstung nach einem Stromausfall, und Messen des Isolationswiderstandes, des Absorptionsverhältnisses, des dielektrischen Verlustes oder des Leckstroms der Kabel jeder Phase des dreiphasigen Kabels (gemäß „DL/T 596-2005 Vorschriften zur Vorbeugung von Stromanlagen“, die Messung wird von einschlägigen Fachleuten ausgeführt, dabei wird es empfohlen, mehr als zwei Punkte zu messen), und Aufzeichnen der Testdaten;
• (13) Bestimmen des Zielkabels und Auswählen des Kabels, das den Alterungsanforderungen entspricht (z.B. ist der dielektrische Verlustfaktor größer als der relevante Standard), als Zielkabel entsprechend dem Alterungszustand des Kabels und den Ergebnissen des Isolationstests, und Durchführen einer Isolationsreparatur;
• (14) Montage, Korrektur und Reparatur des Systems vor Ort, unter Verwendung eines Gasinjektionssystems, das aus einem Luftkompressor und einem daran angeschlossenen Gastrocknungstank besteht wird die trockene Luft mit einer festgelegten Druckstärke (gemäß der Länge des Kabels und der Dicke der Isolation wird ein Reparaturluftdruck von 0,2-0,6 MPa ausgewählt) in das Zielkabel eingespritzt, um die Luftdichtheit an der Verbindungsstelle sicherzustellen, dabei wird es gewährleistet, dass die Reparaturflüssigkeit passieren kann;

Before the repair, the live operating equipment is switched off, after it is switched off, the electrical parameters of the cable are measured, and an aging cable is selected as the cable to be repaired; an air circulation test is performed on the cable to be repaired to ensure that the repair fluid can pass through; the specific steps are as follows:

• (11) Preparing for power outage and security, performing power outage procedures and other preparations in strict accordance with relevant systems in the field (e.g. performing electrical inspections prior to contact with equipment, putting up fences, hanging signs, etc.) in order to obtain a ensure safe and proper repair design;
• (12) Insulation test after power failure, removal of the three-phase cable from the live operating equipment after a power failure, and measurement of insulation resistance, absorption ratio, dielectric loss or leakage current of the cables of each phase of the three-phase cable (according to "DL / T 596-2005 regulations for the prevention of electrical installations ”, the measurement is carried out by relevant professionals (it is recommended to measure more than two points), and recording of the test data;
• (13) determining the target cable and selecting the cable that meets the aging requirements (e.g., the dielectric loss factor is greater than the relevant standard) as the target cable according to the aging condition of the cable and the results of the insulation test, and performing insulation repair;
• (14) Installation, correction and repair of the system on site, using a gas injection system, which consists of an air compressor and a gas drying tank connected to it, the dry air with a specified pressure strength (according to the length of the cable and the thickness of the insulation becomes a repair air pressure selected from 0.2-0.6 MPa) is injected into the target cable to ensure the airtightness at the connection point, thereby ensuring that the repair fluid can pass;

(2) building process of repair

• (21) der mit dem Zielkabel 6 verbundene ellbogenförmige Anschluss an dem Schaltschrank 7 wird demontiert, gemäß den Montageschritten eines herkömmlichen ellbogenförmigen Anschlusses wird er durch einen obigen speziellen ellbogenförmigen Anschluss zur stromführenden Reparatur eines Stromkabels ersetzt, so dass der leitende Stab in dem Hohlraum des ellbogenförmigen Isolationsgehäuses an der Kabelanschlussklemme der stromführenden Betriebsausrüstung anliegt, und der Kabelkern de zu reparierenden Kabels liegt an der Crimpklemme an;
• (22) durch eine Rohrleitung werden die Flüssigkeitsspritzanschlüsse des speziellen ellbogenförmigen Anschlusses, die mit den beiden Enden des zu reparierenden Kabels verbunden sind, jeweils mit dem Reparaturflüssigkeitsspeichertank und dem Restflüssigkeitssammeltank verbunden, der Reparaturflüssigkeitsspeichertank wird dazu verwendet, die Reparaturflüssigkeit bereitzustellen, der Restflüssigkeitssammeltank wird dazu verwendet, die aus dem anderen Ende des Kabels fließende Reparaturflüssigkeit zu sammeln; durch Füllklebstoff. Bügel und andere Zubehöre wird die Rohrleitung mit dem Flüssigkeitsspritzanschluss des speziellen ellbogenförmigen Anschlusses zuverlässig verbunden, um zu gewährleisten, dass die Reparaturflüssigkeit bei größerem Luftdruck keine Leckage hat;
• (23) nach der Montage wird die Stromversorgung für den Schaltschrank nach den Bestimmungen wiederhergestellt;
• (24) Unter der Bedingung der Gewährleistung der Luftdichtheit wird der Luftkompressor 4 eingestellt, um den Luftdruck allmählich zu erhöhen, die durch den Luftkompressor ausgegebene Druckluft wird durch den Gastrocknungstank 2 getrocknet und dann weiter in den Reparaturflüssigkeitsspeichertank 1 gepresst, das Ventil wird eingestellt, so dass die Reparaturflüssigkeit in dem Reparaturflüssigkeitsspeichertank durch einen speziellen ellbogenförmigen Anschluss 1 in den Kabelkern des zu reparierenden Kabels eingespritzt, gemäß der Anzeige der Manometer des Luftkompressors und des Reparaturflüssigkeitsspeichertanks wird der Druck der Druckluft auf 0,2-0,8 MPa eingestellt, so dass die Strömungsrate der Reparaturflüssigkeit eine angemessene Größe erreicht, um ein Einspritzen der Reparaturflüssigkeit bei niedrigem Druck zu erhalten; der gesamte Einspritzvorgang erfolgt stromführend, die Einspritzzeit wird durch die Kabellänge, den Schnitt und den Zirkulationswiderstand usw. bestimmt; der Gastrocknungstank wird zum Trocknen der Luft verwendet, um die Feuchtigkeit in der Luft zu entfernen, dadurch wird es verhindert, dass die Feuchtigkeit in der Luft ins zu reparierende Kabel eindringt und die Reparaturwirkung beeinträchtigt; das Ventil kann die Strömungsrate der Reparaturflüssigkeit steuern und bestimmte Situationen bewältigen (z.B. wird das Ventil bei einer Leckage der Reparaturflüssigkeit schnell geschlossen, um die Versorgung zu unterbrechen);
• (25) nachdem die Reparaturflüssigkeit das gesamte zu reparierende Kabel passierte, wird der Luftkompressor ausgeschaltet, der Reparaturflüssigkeitsspeichertank wird von dem speziellen ellbogenförmigen Anschluss demontiert, und der Gastrocknungstank wird durch eine Rohrleitung mit dem speziellen ellbogenförmigen Anschluss verbunden, ins Einspritzende des zu reparierenden Kabels wird die trockene Luft eingespritzt, so dass die überflüssige Reparaturflüssigkeit aus dem anderen Ende fließt und durch den Restflüssigkeitssammeltank gesammelt, bis aus dem kleinen Löchern des Kabelkopfs keine Reparaturflüssigkeit überläuft (um die Beobachtung zu erleichtern, kann die mit dem Restflüssigkeitssammeltank verbundene Rohrleitung ein durchsichtiger Schlauch sein, von dem durchsichtigen Schlauch wird der Überlauf der Reparaturflüssigkeit beobachtet), um zu verhindern, dass in dem Normalbetrieb des Kabels die Wärme erzeugt wird und somit die Reparaturflüssigkeit aus dem Kabelkopf strömt;

Disassembling the elbow-shaped connector arranged on the live operating equipment, assembling the special elbow-shaped connector for the current-carrying repair of a power cable, and through a pipeline, the special elbow-shaped connections connected to the two ends of the cable to be repaired are connected to the repair liquid storage tank and the residual liquid collection tank, respectively connected; After the installation, the power supply to the live operating equipment is restored, at the same time the air compressor is started to perform low pressure injection, the dried air is injected into the repair liquid storage tank, then the pressurized repair liquid is passed through the elbow-shaped connector into the cable to be repaired injected until the repair fluid passes through the entire cable, the excess repair fluid is taken back through the pipeline via the residual fluid collection tank; then the air compressor is turned off, at the same time a small amount of gas is fed into the injection end of the cable so that the excess repair fluid flows out of the other end; the specific step are as follows:

• (21) the one with the target cable 6th connected elbow-shaped connection to the control cabinet 7th is dismantled, according to the assembly steps of a conventional elbow-shaped connector, it is replaced by the above special elbow-shaped connector for current-carrying repair of a power cable, so that the conductive rod in the cavity of the elbow-shaped insulation housing rests against the cable connection terminal of the current-carrying operating equipment, and the cable core of the current-carrying equipment to be repaired Cable rests against the crimp terminal;
• (22) Through a pipeline, the liquid injection ports of the special elbow-shaped connector connected to the two ends of the cable to be repaired are connected to the repair liquid storage tank and the residual liquid collection tank, respectively, the repair liquid storage tank is used to supply the repair liquid, the residual liquid collection tank is used for this to collect the repair fluid flowing out of the other end of the cable; by filling glue. Brackets and other accessories, the pipeline is reliably connected to the liquid injection port of the special elbow-shaped connection to ensure that the repair liquid does not leak at higher air pressure;
• (23) after installation, the power supply for the control cabinet is restored in accordance with the provisions;
• (24) Under the condition of ensuring the airtightness, the air compressor becomes 4th set to gradually increase the air pressure, the compressed air output by the air compressor is dried by the gas drying tank 2 and then further pressed into the repair liquid storage tank 1, the valve is adjusted so that the repair liquid is in the repair liquid storage tank through a special elbow-shaped connector 1 injected into the cable core of the cable to be repaired, according to the indications of the pressure gauges of the air compressor and the repair liquid storage tank, the pressure of the compressed air is adjusted to 0.2-0.8 MPa so that the flow rate of the repair liquid becomes an appropriate level to prevent injection of the Obtain repair fluid at low pressure; the entire injection process is live, the injection time is determined by the length of the cable, the cut and the circulation resistance, etc.; the gas drying tank is used to dry the air to remove the moisture in the air, thereby preventing the moisture in the air from entering the cable to be repaired and affecting the repair efficiency; the valve can control the flow rate of the repair fluid and cope with certain situations (eg if the repair fluid leaks, the valve is quickly closed to cut off the supply);
• (25) After the repair liquid has passed through the entire cable to be repaired, the air compressor is turned off, the repair liquid storage tank is dismantled from the special elbow-shaped connector, and the gas drying tank is connected to the special elbow-shaped connector through a pipeline, into the injection end of the cable to be repaired is the dry air is injected so that the excess repair liquid flows out of the other end and is collected by the residual liquid collection tank until no repair liquid overflows from the small holes in the cable head (to facilitate observation, the pipeline connected to the residual liquid collection tank can be a transparent hose, from the overflow of the repair fluid is observed in the transparent tube) in order to prevent the heat from being generated during normal operation of the cable and thus the repair fluid from flowing out of the cable head;

Repeat steps (21) - (25) to sequentially perform insulation repair for the target cable.

(3) Post-repair work

After completing the cable repair, the live operating equipment is first turned off, then the special elbow-shaped connector installed on the live operating equipment is dismantled, and the special elbow-shaped connector is separated from the repaired cable, and the cap 1-5 is installed on the liquid injection port of the elbow-shaped port to prevent electrical risk such as creeping and avoid personal injury; then the construction site will be restored.

Since the special elbow-shaped connector can be used as a conventional elbow-shaped connector, after the repair of the cable is finished, the cap becomes 1-5 on the liquid injection port 1-4 of the elbow-shaped connector installed to prevent electrical risks such as creeping and avoid personal injury; then the construction site will be restored.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• US 7658629 B2 [0005]
• US 7538274 B2 [0005]
• US 7331806 B2 [0005]
• CN 200410072791 [0006]
• CN 201010028136 [0006]

Claims (9)

A special elbow-shaped connector (1) for the current-carrying repair of a power cable, characterized in that it comprises an elbow-shaped insulation housing (1-1), a liquid injection connection arrangement arranged on one side of the elbow-shaped insulation housing, and a conductive arrangement; wherein the interior of the elbow-shaped insulation housing forms as a hollow structure an elbow-shaped cavity for receiving the conductive arrangement; and wherein the conductive assembly comprises a conductive rod (1-2) for electrical connection to the cable terminal of live equipment and a crimp terminal (1-3) for electrical connection to a cable to be repaired, and wherein the conductive rod is connected to the crimp terminal and is arranged in the elbow-shaped cavity of the housing, and wherein the free connecting ends of the conductive rod and the crimp terminal each face two outlet directions of the elbow-shaped cavity; and wherein the liquid injection port arrangement comprises a liquid injection port (1-4) arranged on one side of the elbow-shaped insulating housing and a cap (1-5) used to match it, and wherein on the inside of the liquid injection port (1-4) a liquid injection channel (1-4 -1) is formed, which extends to the crimp terminal. Special elbow-shaped connection for the live repair of a power cable according to Claim 1 , characterized in that the crimp terminal is a tubular conductive element, a plurality of inwardly recessed contact elements are arranged on a side wall of it, which form an electrical connection with the cable core of a cable to be repaired inserted into the crimp terminal, and one on a side wall an installation hole of the conductive rod is provided at the other end of the crimp terminal opposite to the insertion end of the cable core. Special elbow-shaped connection for the live repair of a power cable according to Claim 1 , characterized in that the conductive arrangement is fixed by an inner semiconducting layer (1-6) in the chamber of the elbow-shaped insulating housing. Special elbow-shaped connection for the live repair of a power cable according to Claim 1 , characterized in that an outer semiconducting layer (1-7) is arranged on the outside of the elbow-shaped insulation housing, the liquid injection connection and the cap. Special elbow-shaped connection for the live repair of a power cable according to Claim 1 , characterized in that an insulation rod (1-5-1) is arranged in the interior of the cap, which extends outwardly from the upper inner wall of the cap and is used for insertion into the liquid injection channel. Special elbow-shaped connection for the live repair of a power cable according to Claim 5 , characterized in that the inner wall of the liquid spray channel of the liquid spray connection and a corresponding outer side wall of the insulating rod of the cap are designed as a wave-shaped structure. Special elbow-shaped connection for the current-carrying repair of a power cable according to one of the Claims 1 to 6th , characterized in that a limiting projection (1-5-2) is arranged on the inner wall of the cap, a limiting groove (1-4-2) matched to the limiting projection being provided at a corresponding position on the outer wall of the liquid injection port. Device for the current-carrying repair of a power cable, characterized in that it has several special elbow-shaped connections (1) for the current-carrying repair of a power cable according to one of the Claims 1 to 7th a repair liquid storage tank (2), a gas drying tank (3), an air compressor (4) and a residual liquid collection tank (5); wherein the plurality of special elbow-shaped terminals for live repair of a power cable are used to establish a connection between a cable terminal of the live operating equipment and a cable to be repaired; and wherein the repair liquid storage tank (2), the gas drying tank (3) and the air compressor (4) are successively connected to each other by piping, and wherein the output port of the repair liquid storage tank is connected by piping to a liquid injection port of the elbow-shaped connector which is connected to one end of the to be repaired Cable is connected, communicates, and wherein the input port of the residual liquid collection tank communicates with a liquid injection port of the elbow-shaped port connected to the other end of the cable to be repaired. Device for the live repair of a power cable according to Claim 8 , characterized in that on the pipeline through which the repair liquid storage tank communicates with the liquid injection port of the elbow-shaped connector, and the pipeline through which the residual liquid collection tank communicates with the liquid injection connection of the elbow-shaped connection, a valve is arranged in each case.

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