CN114023546A - Current transformer for 35kV inflatable incoming line switch cabinet and installation method thereof - Google Patents

Current transformer for 35kV inflatable incoming line switch cabinet and installation method thereof Download PDF

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Publication number
CN114023546A
CN114023546A CN202111312059.0A CN202111312059A CN114023546A CN 114023546 A CN114023546 A CN 114023546A CN 202111312059 A CN202111312059 A CN 202111312059A CN 114023546 A CN114023546 A CN 114023546A
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CN
China
Prior art keywords
current transformer
winding
inflatable
gas
switch cabinet
Prior art date
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Pending
Application number
CN202111312059.0A
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Chinese (zh)
Inventor
李传东
张宁
赵兴永
卢占庆
李传红
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Shandong Iron and Steel Co Ltd
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Shandong Iron and Steel Co Ltd
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Publication date
Application filed by Shandong Iron and Steel Co Ltd filed Critical Shandong Iron and Steel Co Ltd
Priority to CN202111312059.0A priority Critical patent/CN114023546A/en
Publication of CN114023546A publication Critical patent/CN114023546A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • H01F2038/305—Constructions with toroidal magnetic core

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Gas-Insulated Switchgears (AREA)

Abstract

The invention discloses a current transformer for a 35kV inflatable incoming line switch cabinet and an installation method thereof, wherein the current transformer comprises: the current transformer comprises a current transformer body, a current transformer primary winding, a current transformer secondary winding and an iron core. The number of the secondary windings of the current transformer is three, and the three secondary windings are respectively a measuring winding, a metering winding and an overcurrent protection winding; the number of the iron cores is three, the three iron cores are of a split structure, and each iron core is correspondingly provided with a measuring winding, a metering winding and an overcurrent protection winding. From this, this current transformer can replace the interior high-voltage current transformer of 35kV gas-filled switch cabinet effectively, can reduce the structure size of the cabinet body for the cabinet body can realize the miniaturization, can reduce the manufacturing cost of 35kV gas-filled switch cabinet, can guarantee safe power supply in subsequent use, can reduce the maintenance cost simultaneously, and economy, safety effect are showing.

Description

Current transformer for 35kV inflatable incoming line switch cabinet and installation method thereof
Technical Field
The invention relates to the technical field of GIS gas cabinets, in particular to a current transformer for a 35kV inflatable incoming line switch cabinet and an installation method thereof.
Background
A Gas Insulated Switchgear (GIS) Switch cabinet, which is composed of a circuit breaker, a disconnecting Switch, a grounding Switch, a mutual inductor, a lightning arrester, a bus, a connecting piece, an outgoing line terminal and the like, wherein the devices or components are all sealed in a metal grounded shell, and SF with certain pressure is filled in the metal grounded shell6Insulating gas, hence the name SF6A totally-enclosed combined electrical apparatus. The AIS (conventional air-insulated open switchgear) switch cabinet has the advantages that live parts such as buses are exposed outside, can be directly contacted with air, and meanwhile, the occupied area is large, so that the AIS switch cabinet cannot be used in scenes with narrow transformer substation areas and severe environmental conditions. Compared with an AIS switch cabinet, the GIS switch cabinet has the advantages of compact structure, small occupied area, high reliability, flexible configuration, convenience in installation, high safety, high environmental adaptability and small maintenance workload, the maintenance interval of main components is not less than 20 years, and in recent years, the GIS is widely applied to the high-voltage and ultrahigh-voltage fields. In addition, GIS switchgears are more expensive to use than AIS switchgears, which are also used in some applications.
In order to meet the installation requirements of the transformer substation in the place with small area and severe environmental conditions, in the prior art, there is an inflatable high-voltage switch cabinet (C-GIS for short), which uses the SF of the GIS switch cabinet6The gas insulation technology and the sealing technology are effectively combined with the air-insulated switch cabinet manufacturing technology, each high-voltage element is arranged in a box-shaped sealed container, low-pressure insulating gas is filled into the box-shaped sealed container, and finally the box-shaped sealed container is processed by modern processing means to form a set of serialized medium-voltage switch cabinet products. Such a switchgear cabinet is usually formed by sealing a vacuum circuit breaker, a disconnector, a voltage transformer, etc. in a closed container and charging the container with SF6The gas forms an insulation, the other part is a conventional air insulation. In order to realize the miniaturization of the cabinet body and further reduce the investment cost, a current transformer for a 35kV inflatable inlet wire switch cabinet needs to be developed.
Disclosure of Invention
In order to solve part or all technical problems in the prior art, the invention provides a current transformer for a 35kV inflatable incoming line switch cabinet and an installation method thereof.
The technical scheme of the invention is as follows:
according to a first aspect of the present invention, there is provided a current transformer for a 35kV gas-filled incoming line switchgear, comprising:
a current transformer body;
a primary winding of a current transformer;
the current transformer secondary windings are three in number and respectively comprise a measuring winding, a metering winding and an overcurrent protection winding;
the number of the iron cores is three, the three iron cores are of a split structure, and each iron core is correspondingly provided with the measuring winding, the metering winding and the overcurrent protection winding.
Optionally, the current transformer body is formed by pouring epoxy resin, and the current transformer is a through-type low-voltage current transformer.
Optionally, the current transformer primary winding is constructed from a 35kV single core power cable.
Optionally, the bottom of the current transformer body is further provided with a plurality of mounting holes.
According to a second aspect of the present invention, there is provided a method of installing a current transformer for a 35kV gas-filled inlet switchgear, the method being used for the current transformer for the 35kV gas-filled inlet switchgear according to any of the first aspects of the present invention, the method comprising:
s1: a 35kV single-core power cable penetrates through the iron core of the current transformer, one end of the single-core power cable is connected to an overhead steel-cored aluminum stranded wire of a terminal tower, and the other end of the single-core power cable is connected to a copper bus bar row in an inflatable cabinet;
s2: mounting the current transformer body on a channel steel fixed on a wall body;
s3: installing the current transformer body in a cable interlayer of a cable chamber;
s4: and respectively connecting the measuring winding, the metering winding and the overcurrent protection winding in the secondary winding of the current transformer to a measuring current wiring terminal, a metering current wiring terminal and a protection current wiring terminal of a microcomputer protection measurement and control device through leads.
Optionally, in the step S1, the copper bus bar is connected to the 35kV bus via a vacuum circuit breaker and a three-position disconnector.
Optionally, the bottom of the current transformer body is provided with a plurality of mounting holes,
in the step S2, the current transformer body is connected to the L-shaped steel plate through bolts, and the L-shaped steel plate is fixed to the channel steel through bolts, so that the channel steel can be fixed in a wall in advance through a pouring mode.
Optionally, in the step S3, the cable interlayer is installed to the lower side of the 35kV gas-filled switch room in advance.
Optionally, in the step S1, one end of the copper bus bar is connected to an overvoltage protector, and the other end of the copper bus bar is connected to a caller id display.
The technical scheme of the invention has the following main advantages:
the current transformer for the 35kV inflatable incoming line switch cabinet can effectively replace a high-voltage current transformer in the 35kV inflatable switch cabinet, can reduce the structural size of the cabinet body, enables the cabinet body to be miniaturized, can reduce the manufacturing cost of the 35kV inflatable switch cabinet, can ensure safe power supply in subsequent use, can reduce the maintenance cost, and has obvious economic and safety effects.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a current transformer for a 35kV gas-filled incoming switchgear according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an installation of a current transformer for a 35kV gas-filled inlet switchgear according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a 35kV gas-filled inlet switchgear installation with a current transformer in accordance with an embodiment of the present invention;
fig. 4 is a schematic diagram of an installation process of a current transformer for a 35kV gas-filled incoming line switchgear according to an embodiment of the present invention.
Description of reference numerals:
10: current transformer body 20: primary winding of current transformer
31: measurement winding 32: metering winding
33: overcurrent protection winding
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 4, in one embodiment according to the present invention, there is provided a current transformer for a 35kV gas-filled incoming line switchgear and a method of installing the same.
Specifically, as shown in fig. 1, the current transformer for the 35kV gas-filled incoming line switch cabinet comprises a current transformer body 10, a current transformer primary winding 20, a current transformer secondary winding and an iron core.
The number of the secondary windings of the current transformer is three, and the secondary windings respectively comprise a measuring winding 31, a metering winding 32 and an overcurrent protection winding 33. The accurate grades of the three windings are respectively 0.5 grade, 0.5S grade and 5P20 grade.
Correspondingly, the number of the iron cores is also three, the three iron cores adopt a split structure design, and each iron core is correspondingly provided with the measuring winding 31, the metering winding 32 and the overcurrent protection winding 33.
It can be understood that each secondary winding of the current transformer is configured with a separate iron core because the secondary winding of each current transformer has different functions, different accuracy levels and different voltage-current characteristic curves.
Further, the current transformer body 10 is formed by pouring epoxy resin, and the current transformer is a through low-voltage current transformer.
The primary winding 20 of the current transformer is constructed from a 35kV single core power cable.
In addition, for convenience of installation, the bottom of the current transformer body 10 is further provided with a plurality of installation holes, whereby the current transformer can be fixed at a desired position by means of bolts.
In this embodiment, a method for installing a current transformer for a 35kV gas-filled incoming line switch cabinet is also provided, and the installation method can be used for the current transformer for the 35kV gas-filled incoming line switch cabinet in this embodiment.
Specifically, as shown in fig. 3 and 4, the mounting method includes:
s1: a 35kV single-core power cable penetrates through the iron core of the current transformer, one end of the single-core power cable is connected to an overhead steel-cored aluminum stranded wire of a terminal tower, and the other end of the single-core power cable is connected to a copper bus bar row in an inflatable cabinet;
s2: mounting the current transformer body on a channel steel fixed on a wall body;
s3: installing the current transformer body in a cable interlayer of a cable chamber;
s4: and respectively connecting the measuring winding, the metering winding and the overcurrent protection winding in the secondary winding of the current transformer to a measuring current wiring terminal, a metering current wiring terminal and a protection current wiring terminal of a microcomputer protection measurement and control device through leads.
For example, in step S1, one end of the 35kV single-core power cable may be first connected to the copper bus bar in the 35kV gas-filled switchgear, and the other end thereof passes through all the cores of the current transformer and is connected to the overhead steel-cored aluminum strand of the terminal tower. As an implementation mode, the other end of the single-core power cable can be connected with the overhead steel-cored aluminum stranded wire through an bow wire at a terminal tower. Furthermore, the copper bus bar may be connected to a 35kV bus bar via a vacuum circuit breaker and a three-position disconnector in turn.
The bottom of the current transformer body is provided with a plurality of mounting holes, and in the present embodiment, as shown in fig. 2, the base of the current transformer body 10 is provided with 4 mounting holes. In step S2, the current transformer may be connected to one end of the L-shaped steel plate through a bolt, the other end of the L-shaped steel plate is fixedly connected to the channel steel through a bolt, and the channel steel may be fixed in the wall in advance by a pouring method, so that the current transformer body may be fixed to the wall.
Preferably, the lower side of the 35kV gas-filled switchgear is provided with a cable interlayer, and in step S3, the current transformer body may be installed in the cable interlayer of the cable chamber.
In a specific embodiment, the current transformer selected may be of the type LMZBJ1-0.5/3- Φ 80. The L-current transformer, the M-bus type structure, the Z-casting insulation, the B-protective stage, the J-enlarged capacity, the 1-design serial number, the 0.5-rated voltage (the unit is kV), the 3-three secondary windings, the phi 80 mm-inner hole diameter size is 80mm, and the outer diameter is 220 mm; the transformation ratio of the selected current transformer is 800/5; the model of the selected power cable is ZR-YJV-26/35kV-1 x 240mm2The cable diameter is 16 mm.
It will be appreciated that a 35kV single core power cable needs to pass through the inner diameter of the current transformer, and therefore the inner diameter of the current transformer must be larger than the outer diameter of the single core power cable connected. Preferably, at least 2 single-core power cables need to be passed through the inside diameter of the current transformer, and sufficient installation clearance must be reserved. From this, ensure that single core power cable's one end can be connected to the power side air wire of terminal shaft tower department, the copper generating line row in the inflatable switch cabinet of 35kV can be connected to the other end for 35kV high tension power supply can work a telephone switchboard to the inflatable switch cabinet of 35 kV.
Further, in step S4, the terminals 1S1 and 1S2 of the measurement winding 31 in the secondary winding of the current transformer may be connected to the measurement current terminals of the microcomputer protection measurement and control device through wires; the wiring terminals 2S1 and 2S2 of the metering winding 32 in the secondary winding of the current transformer can be connected to the metering current wiring terminal of the microcomputer protection measurement and control device through a lead; the terminals 3S1 and 3S2 of the overcurrent protection winding 33 in the secondary winding of the current transformer can be connected to the protection current terminal of the microcomputer protection measurement and control device through a lead. Illustratively, the wire employed may be 2.5mm2The single strand copper core wire.
Therefore, three windings of the current transformer for measurement, metering, overcurrent protection and the like are respectively connected to a measurement current wiring terminal, a metering current wiring terminal and a protection current wiring terminal of the microcomputer protection measurement and control device through wires. When the 35kV single-core power cable passes through a high-voltage power supply, secondary current can be induced in a current loop where each secondary winding of the current transformer is located, and the current measurement, the electric energy metering and the overcurrent protection functions of the 35kV gas-filled cabinet can be realized.
Further, in step S1, one end of the copper bus bar may be connected to the overvoltage protector, and the other end of the copper bus bar may be connected to the caller id display.
It should be noted that the current transformer for the 35kV gas inlet switch cabinet in the present embodiment can be used for a 35kV inlet switch cabinet, and also can be used for a main transformer high-voltage side switch cabinet or a feed-out line switch cabinet.
The current transformer for the 35kV gas-filled switch cabinet in the embodiment has the following advantages:
the current transformer for the 35kV inflatable incoming line switch cabinet can effectively replace a high-voltage current transformer in the 35kV inflatable switch cabinet, can reduce the structural size of the cabinet body, enables the cabinet body to be miniaturized, can reduce the manufacturing cost of the 35kV inflatable switch cabinet, can ensure safe power supply in subsequent use, can reduce the maintenance cost, and has obvious economic and safety effects.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (9)

1. The utility model provides a 35kV aerifys current transformer for inlet wire cubical switchboard which characterized in that includes:
a current transformer body;
a primary winding of a current transformer;
the current transformer secondary windings are three in number and respectively comprise a measuring winding, a metering winding and an overcurrent protection winding;
the number of the iron cores is three, the three iron cores are of a split structure, and each iron core is correspondingly provided with the measuring winding, the metering winding and the overcurrent protection winding.
2. The current transformer for the 35kV inflatable incoming line switch cabinet according to claim 1, wherein the current transformer body is formed by pouring epoxy resin, and the current transformer is a straight-through low-voltage current transformer.
3. The current transformer for a 35kV gas-filled inlet switchgear according to claim 1, wherein the primary winding of the current transformer is constructed by a 35kV single core power cable.
4. The 35kV aerifys inlet wire current transformer for cubical switchboard of claim 1, characterized in that, the bottom of current transformer body still is provided with a plurality of mounting holes.
5. A method of mounting a current transformer for a 35kV inflatable inlet switchgear, characterized in that the method of mounting is used for a current transformer for a 35kV inflatable inlet switchgear according to any of claims 1 to 4, the method of mounting comprising:
s1: a 35kV single-core power cable penetrates through the iron core of the current transformer, one end of the single-core power cable is connected to an overhead steel-cored aluminum stranded wire of a terminal tower, and the other end of the single-core power cable is connected to a copper bus bar row in an inflatable cabinet;
s2: mounting the current transformer body on a channel steel fixed on a wall body;
s3: installing the current transformer body in a cable interlayer of a cable chamber;
s4: and respectively connecting the measuring winding, the metering winding and the overcurrent protection winding in the secondary winding of the current transformer to a measuring current wiring terminal, a metering current wiring terminal and a protection current wiring terminal of a microcomputer protection measurement and control device through leads.
6. The method for installing a current transformer for a 35kV gas-filled incoming switchgear cabinet according to claim 5, wherein in the step S1, the copper bus bar is connected to a 35kV bus via a vacuum circuit breaker and a three-position disconnector.
7. The method for installing the current transformer for the 35kV inflatable incoming line switch cabinet according to claim 5, wherein a plurality of installation holes are formed in the bottom of the current transformer body,
in the step S2, the current transformer body is connected to the L-shaped steel plate through bolts, and the L-shaped steel plate is fixed to the channel steel through bolts, so that the channel steel can be fixed in a wall in advance through a pouring mode.
8. The method for installing a current transformer for a 35kV gas-filled incoming switchgear cabinet according to claim 5, wherein in the step S3, the cable interlayer is installed to the lower side of the 35kV gas-filled switchgear cabinet in advance.
9. The method for installing a current transformer for a 35kV gas-filled incoming switchgear cabinet as claimed in claim 5, wherein in the step S1, one end of the copper bus bar is connected to an overvoltage protector, and the other end of the copper bus bar is connected to a caller ID.
CN202111312059.0A 2021-11-08 2021-11-08 Current transformer for 35kV inflatable incoming line switch cabinet and installation method thereof Pending CN114023546A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111312059.0A CN114023546A (en) 2021-11-08 2021-11-08 Current transformer for 35kV inflatable incoming line switch cabinet and installation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111312059.0A CN114023546A (en) 2021-11-08 2021-11-08 Current transformer for 35kV inflatable incoming line switch cabinet and installation method thereof

Publications (1)

Publication Number Publication Date
CN114023546A true CN114023546A (en) 2022-02-08

Family

ID=80062224

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111312059.0A Pending CN114023546A (en) 2021-11-08 2021-11-08 Current transformer for 35kV inflatable incoming line switch cabinet and installation method thereof

Country Status (1)

Country Link
CN (1) CN114023546A (en)

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