CN111458549A

CN111458549A - Novel combined metering mutual inductor

Info

Publication number: CN111458549A
Application number: CN202010261328.4A
Authority: CN
Inventors: 叶飞; 刘斌; 封容平; 唐福新; 毛武龙
Original assignee: Zhejiang Horizon Transformer Co ltd
Current assignee: Zhejiang Horizon Transformer Co ltd
Priority date: 2020-04-03
Filing date: 2020-04-03
Publication date: 2020-07-28

Abstract

The invention relates to the technical field of power distribution systems and discloses a novel combined metering transformer which comprises an insulating wall-penetrating sleeve, a sealing assembly, a sealing sleeve and a jack with a contact finger spring. This novel combination formula measurement mutual-inductor through integrated design, in having solved traditional looped netowrk cabinet, current, voltage transformer set up respectively, and the product matches the degree poor, wiring complicacy, bulky, has the potential safety hazard scheduling problem. The combined transformer of a pluggable interface technology has been developed, the connection structure of elbow type plug, cable or copper bar has been cancelled, the needs such as mutual-inductor check-up, convenient change have been satisfied promptly, the product volume has been reduced again, the cost is reduced, the reliability is improved, simultaneously, new construction product utilizes means such as electric field analysis, the design has netted shielding at the high connection position of concentration, the electrical property of product has further been improved, thereby has reached little volume, quick detachable, connect reliable purpose.

Description

Novel combined metering mutual inductor

Technical Field

The invention relates to the technical field of power distribution systems, in particular to a novel combined metering transformer.

Background

With the continuous development of economy in China, the national strength is continuously enhanced, and the power consumption of the whole society is sharply increased, the power consumption of the whole society in 2018 published by the national energy agency reaches 68449 hundred million kilowatts, a power distribution network plays a role in the whole power utilization of users, and the requirement for changing the power supply reliability is provided. Therefore, the ring main unit is widely applied to a power distribution system, the power failure of a certain transformer substation is realized, the power supply capacity of another transformer substation can be realized through the ring main unit, and the power failure time is effectively reduced. At present, current in the looped netowrk cabinet, voltage transformer are the dispersed configuration in the cabinet, and occupation space is big, and voltage transformer's a connection adopts elbow type plug connection, and the three-phase needs have six elbow type plugs, and the installation is complicated and the reliability is relatively poor, and the transformer is patrolled and examined and is checked and all need dismantle these elbow type plugs, very consuming time and the unable assurance of security, for this reason, research and develop a small volume, quick detachable, connect reliable combination formula mutual-inductor product, is the urgent needs of inflatable products such as current looped netowrk cabinet.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a novel combined metering transformer which has the advantages of small volume, easiness in disassembly, reliability in connection and the like, and solves the problems that current transformers and voltage transformers in a ring main unit are dispersedly arranged in the main unit, the occupied space is large, the voltage transformers are connected through elbow-shaped plugs in one-time connection, six elbow-shaped plugs are needed for three phases, the installation is complex, the reliability is poor, the elbow-shaped plugs need to be disassembled for transformer inspection and verification, the time is very long, and the safety cannot be guaranteed.

(II) technical scheme

In order to achieve the purposes of small volume, easy disassembly and reliable connection, the invention provides the following technical scheme: a novel combined metering mutual inductor comprises an insulating wall penetrating sleeve, a sealing assembly, a sealing sleeve, a jack with a contact finger spring, a mounting plate, an epoxy resin insulator, a contact pin, a voltage primary terminal, a bottom plate, a secondary terminal, an electricity larceny prevention cover, a voltage primary connecting assembly, a current primary winding, a current transformer power supply winding core, a current transformer main core, a voltage transformer core, an incision air gap, a voltage primary winding, a shielding net, a current primary terminal and a handle, wherein the bottom of the insulating wall penetrating sleeve is fixedly connected with the top of the sealing assembly, the top of the inner wall of the insulating wall penetrating sleeve is fixedly connected with the top of the contact pin, the bottom of the contact pin penetrates through the top of the sealing sleeve and extends into the sealing sleeve, the bottom of the sealing sleeve penetrates through a central shaft of the sealing assembly and extends to the lower part of the sealing sleeve, the inner ring of the sealing sleeve is movably connected, the bottom of the jack with the contact finger spring is fixedly connected with the top of the mounting plate, the bottom of the mounting plate is fixedly connected with the top of the epoxy resin insulation, the bottom of the epoxy resin insulation is fixedly connected with the top of the bottom plate, the top of the bottom plate is fixedly connected with the bottom of a current transformer power winding iron core, the top of the current transformer power winding iron core is fixedly connected with the bottom of a current primary winding, the bottom of the current primary winding is fixedly connected with the top of a current transformer main iron core, the left side of the epoxy resin insulation is fixedly connected with the right side of a secondary terminal, the left side of the secondary terminal is fixedly connected with the right side of an electricity stealing prevention cover, the top of the bottom plate is fixedly connected with the bottom of a voltage transformer iron core, the notch air gap is positioned in a central axis of the voltage transformer iron core, the top of the voltage primary winding is fixedly connected with the bottom of the shielding net, the top of the shielding net is fixedly connected with the bottom of the current primary terminal, and the bottom of the bottom plate is fixedly connected with the top of the handle.

Preferably, the insulating wall bushing, the sealing assembly, the sealing sleeve, the contact pin and the voltage one-time connecting assembly are integrally assembled with the SF sealed chamber.

Preferably, the current primary winding and the voltage primary winding are arranged in parallel, connected by a copper bar and led out.

Preferably, the voltage primary terminal and the current primary terminal are wrapped in a conical shape by adopting epoxy resin insulation and are in interference fit with an inner hole of the sealing sleeve.

Preferably, the current and voltage transformers share a current primary terminal.

Preferably, the voltage primary terminal is fixedly connected with a voltage primary connecting component in the insulating wall bushing.

Compared with the prior art, the invention provides a novel combined metering transformer, which has the following beneficial effects:

1. this novel combination formula measurement mutual-inductor through integrated design, in having solved traditional looped netowrk cabinet, current, voltage transformer set up respectively, and the product matches the degree poor, wiring complicacy, bulky, has the potential safety hazard scheduling problem. A combined transformer of a pluggable interface technology is developed, a connecting structure of an elbow type plug, a cable or a copper bar is omitted, the requirements of transformer checking, convenient replacement and the like are met, the product volume is reduced, the cost is reduced, and the reliability is improved. Meanwhile, the novel structure product utilizes means such as electric field analysis and the like, and is designed with a net-shaped shield at a connecting part with high concentration, so that the electrical performance of the product is further improved, and the purposes of small volume, easy disassembly and reliable connection are achieved.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

Wherein: the device comprises an insulation wall-penetrating sleeve 1, a sealing assembly 2, a sealing sleeve 3, a jack with a contact finger spring 4, a mounting plate 5, epoxy resin insulation 6, a contact pin 7, a voltage primary terminal 8, a bottom plate 9, a secondary terminal 10, an electricity larceny prevention cover 11, a voltage primary connecting assembly 12, a current primary winding 13, a current transformer power supply winding iron core 14, a current transformer main iron core 15, a voltage transformer iron core 16, a 17-notch air gap, a voltage primary winding 18, a shielding net 19, a current primary terminal 20 and a handle 21.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1, a novel combined metering transformer comprises an insulating wall bushing 1, a sealing assembly 2, a sealing sleeve 3, a jack 4 with a contact finger spring, a mounting plate 5, an epoxy resin insulator 6, a contact pin 7, a voltage primary terminal 8, a bottom plate 9, a secondary terminal 10, an electricity larceny prevention cover 11, a voltage primary connecting assembly 12, a current primary winding 13, a current transformer power supply winding iron core 14, a current transformer main iron core 15, a voltage transformer iron core 16, a cut air gap 17, a voltage primary winding 18, a shielding net 19, a current primary terminal 20 and a handle 21, wherein the bottom of the insulating wall bushing 1 is fixedly connected with the top of the sealing assembly 2, the top of the inner wall of the insulating wall bushing 1 is fixedly connected with the top of the contact pin 7, the bottom of the contact pin 7 penetrates through the top of the sealing sleeve 3 and extends into the interior of the sealing sleeve, the bottom, the inner ring of a sealing sleeve 3 is movably connected with the outer ring of a jack 4 with a contact finger spring, the top of the jack 4 with the contact finger spring is movably connected with the bottom of a contact pin 7, the bottom of the jack 4 with the contact finger spring is fixedly connected with the top of an installation plate 5, the bottom of the installation plate 5 is fixedly connected with the top of an epoxy resin insulation 6, the bottom of the epoxy resin insulation 6 is fixedly connected with the top of a bottom plate 9, the top of the bottom plate 9 is fixedly connected with the bottom of a current transformer power winding iron core 14, the top of the current transformer power winding iron core 14 is fixedly connected with the bottom of a current primary winding 13, the bottom of the current primary winding 13 is fixedly connected with the top of a current transformer main iron core 15, the left side of the epoxy resin insulation 6 is fixedly connected with the right side of a secondary terminal 10, the left side of the secondary terminal 10 is, the top of a voltage transformer iron core 16 is fixedly connected with the bottom of a voltage primary winding 18, the top of the voltage primary winding 18 is fixedly connected with the bottom of a voltage primary terminal 8, the top of the voltage primary winding 18 is fixedly connected with the bottom of a shielding net 19, the top of the shielding net 19 is fixedly connected with the bottom of a current primary terminal 20, the bottom of a bottom plate 9 is fixedly connected with the top of a handle 21, an insulating wall-penetrating sleeve 1, a sealing assembly 2, a sealing sleeve 3, a contact pin 7 and a voltage primary connecting assembly 12 are integrally assembled with an SF6 closed air chamber, the air chamber is isolated from the outside, an electrical connection wall-penetrating structure is formed, meanwhile, the air tightness of the SF6 closed air chamber is guaranteed, the combined transformer is of an integrated structure of a current transformer and a voltage transformer, a current transformer winding 13 and a voltage transformer winding 18 are arranged in parallel, copper bars are, a voltage transformer B phase primary terminal 8 alone, in the electric field concentration department, design has shielding net 19, the electrical insulation performance for improving the product, the electric current, voltage transformer primary terminal 20(8) is insulating the parcel with epoxy and is toper, be interference fit with seal cover 3 hole, current transformer primary terminal 20 is equipped with the jack 4 of area touch finger spring, cooperate with contact pin 7 in the insulating wall bushing 1 of cabinet body, form reliable primary current connection structure, voltage transformer primary terminal 8 links to each other with the voltage primary connection subassembly 12 in the insulating wall bushing 1 of cabinet body, form reliable primary voltage connection structure, mounting plate 9 is equipped with handle 21, make things convenient for the loading and unloading of product.

Experimental example:

s1: modeling;

s2: simulation analysis (analysis is only directed to epoxy part, and winding turn-to-turn and interlayer insulation are not in the simulation range);

a1: primary insulation to ground analysis;

b1, test voltage is 75kV (lightning impulse level) × 1.2.2 (coefficient) is 90 kV;

b2: simulation results of the internal insulation electric field;

b3: data analysis and conclusions

D1: as known from typical 4 sections in the transformer, when the test voltage is 90kV (peak value), the electric field intensity of each position in the epoxy casting body does not exceed the breakdown field intensity of the epoxy material (the design selection value is 180kV/cm), and the internal insulation design is safe;

d2: according to the electric field analysis of the outer surface of the mutual inductor, when the test voltage is 90kV (peak value), the phenomenon (red position) that the field intensity exceeds the air breakdown field intensity (30kV/cm) occurs at the positions of the outlet end and the upper end part of the pouring body;

d3: therefore, 2 proposals are made:

e1: the red position of the sleeve is filled with a silica gel sleeve during assembly, so that air residue at the position is reduced;

e2: and spraying a semi-conductive material on the surface of the transformer and grounding.

A2: phase-to-phase insulation analysis (B pairs P1P2 and ground are the analysis targets);

f1: testing voltage: 90kV (same as 2.1.1);

f2: analyzing an internal insulation electric field;

f3: data analysis and conclusion:

g1: as known from typical 4 sections in the transformer, when the test voltage is 90kV (peak value), the electric field intensity of each position in the epoxy casting body does not exceed the breakdown field intensity of the epoxy material (the design selection value is 180kV/cm), and the internal insulation design is safe;

g2: according to the analysis of the electric field on the outer surface of the mutual inductor, when the test voltage is 90kV (peak value), the phenomenon (red position) that the field intensity of the B-phase outlet end of the casting body exceeds the air breakdown field intensity (30kV/cm) occurs;

f4: the corresponding recommendation is as D3.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a novel combined metering transformer, including insulating wall bushing (1), seal assembly (2), seal cover (3), jack (4) of area contact finger spring, mounting panel (5), epoxy is insulating (6), contact pin (7), voltage primary terminal (8), bottom plate (9), secondary terminal (10), anti-electricity-theft cover (11), voltage primary connecting subassembly (12), current primary winding (13), current transformer power winding iron core (14), current transformer owner iron core (15), voltage transformer iron core (16), incision air gap (17), voltage primary winding (18), shielding net (19), current primary terminal (20) and handle (21), its characterized in that: the bottom of the insulating wall-penetrating sleeve (1) is fixedly connected with the top of the sealing assembly (2), the top of the inner wall of the insulating wall-penetrating sleeve (1) is fixedly connected with the top of a contact pin (7), the bottom of the contact pin (7) penetrates through the top of the sealing sleeve (3) and extends into the sealing sleeve, the bottom of the sealing sleeve (3) penetrates through the center shaft of the sealing assembly (2) and extends to the lower part of the sealing assembly, the inner ring of the sealing sleeve (3) is movably connected with the outer ring of the jack (4) with a contact finger spring, the top of the jack (4) with the contact finger spring is movably connected with the bottom of the contact pin (7), the bottom of the jack (4) with the contact finger spring is fixedly connected with the top of the mounting plate (5), the bottom of the mounting plate (5) is fixedly connected with the top of the epoxy resin insulation (6), the bottom of the epoxy resin insulation (6) is fixedly connected with the top of the bottom plate (9, the top of a power winding iron core (14) of the current transformer is fixedly connected with the bottom of a current primary winding (13), the bottom of the current primary winding (13) is fixedly connected with the top of a main iron core (15) of the current transformer, the left side of an epoxy resin insulation (6) is fixedly connected with the right side of a secondary terminal (10), the left side of the secondary terminal (10) is fixedly connected with the right side of an electricity larceny prevention cover (11), the top of a bottom plate (9) is fixedly connected with the bottom of a voltage transformer iron core (16), a notch air gap (17) is positioned in a central shaft of the voltage transformer iron core (16), the top of the voltage transformer iron core (16) is fixedly connected with the bottom of a voltage primary winding (18), the top of the voltage primary winding (18) is fixedly connected with the bottom of a voltage primary terminal (8), and the top of the voltage primary winding (18, the top of the shielding net (19) is fixedly connected with the bottom of the current primary terminal (20), and the bottom of the bottom plate (9) is fixedly connected with the top of the handle (21).

2. The novel combined metering transformer of claim 1, characterized in that: the insulating wall bushing (1), the sealing assembly (2), the sealing sleeve (3), the contact pin (7) and the voltage one-time connecting assembly (12) are integrally assembled with an SF6 sealed chamber.

3. The novel combined metering transformer of claim 1, characterized in that: the current primary winding (13) and the voltage primary winding (18) are arranged in parallel and are connected and led out by adopting a copper bar.

4. The novel combined metering transformer of claim 1, characterized in that: the voltage primary terminal (8) and the current primary terminal (20) are wrapped into a cone shape by adopting epoxy resin insulation and are in interference fit with an inner hole of the sealing sleeve (3).

5. The novel combined metering transformer of claim 1, characterized in that: the current and voltage transformers share a current primary terminal (20).

6. The novel combined metering transformer of claim 1, characterized in that: and the voltage primary terminal (8) is fixedly connected with a voltage primary connecting component (12) in the insulating wall bushing (1).