CN210378739U

CN210378739U - Combined current and voltage transformer

Info

Publication number: CN210378739U
Application number: CN201921334567.7U
Authority: CN
Inventors: 孙征; 李瑞利; 张庆; 谢冰峰; 苗东发
Original assignee: Kaifeng Daqing Electric Appliance Co ltd
Current assignee: Kaifeng Daqing Electric Appliance Co ltd
Priority date: 2019-08-16
Filing date: 2019-08-16
Publication date: 2020-04-21
Anticipated expiration: 2029-08-16

Abstract

A combined current-voltage transformer effectively solves the problems that the transformer composed of the current transformer and the voltage transformer has poor anti-interference performance, short service life and is easy to be damaged due to vibration influence; the combined current and voltage transformer comprises a shell, wherein a first sliding plate and a second sliding plate are slidably mounted in the shell, the upper end of the first sliding plate and the lower end of the second sliding plate are respectively provided with an upper damping structure and a lower damping structure, the upper end of the second sliding plate is provided with a combined current and voltage transformer, baffles are respectively arranged on the front, back, left and right sides of the combined current and voltage transformer, and the upper end and the lower end of each baffle are respectively fixedly connected with the first sliding plate and the second sliding plate; the current transformer and the voltage transformer are made into a whole by effective insulation measures, so that the cost of a product is greatly reduced, the simple splicing and combination of the two transformers in a conventional low-voltage system are avoided, the high-voltage and ultrahigh-voltage transformer can be suitable for a high-voltage system and a ultrahigh-voltage system, and the purpose of finishing two functions of the current transformer and the voltage transformer by one device can be realized.

Description

Combined current and voltage transformer

Technical Field

The utility model relates to a mutual-inductor technical field for electric power system, in particular to modular current-voltage transformer.

Background

The mutual inductor is also called instrument transformer, and is a general name of current mutual inductor and voltage mutual inductor. The high voltage can be changed into low voltage, and the large current can be changed into small current for measuring or protecting the system. Its function is mainly to convert high voltage or large current into standard low voltage (100V) or standard small current (5A or 1A, both referring to rated value) in proportion so as to realize standardization and miniaturization of measuring instrument, protection equipment and automatic control equipment. Meanwhile, the mutual inductor can be used for isolating a high-voltage system so as to ensure the safety of people and equipment.

The current transformers and the voltage transformers are independent individuals, and sufficient insulation space and distance are required for installation among all transformers in the power station, so that the occupied area of the power station is increased by many times. Meanwhile, the independent current transformer and voltage transformer also greatly waste manufacturing materials, which causes increase of manufacturing cost, thereby increasing use and maintenance cost.

Some combined current and voltage transformers in the prior art are used under the condition that the system voltage is not very high, and the current transformer and the voltage transformer are combined in a steel container, and the independent current transformer and the independent voltage transformer are simply combined and spliced in the steel container, but in the operation of a power grid, the current transformer and the voltage transformer which are arranged in the steel container have electromagnetic interference with each other, so that the measurement precision of the current transformer and the voltage transformer is influenced, the metering is inaccurate, the combined current and voltage transformers cannot be suitable for high-voltage and ultrahigh-voltage occasions or the current transformer is installed on the voltage transformer by using epoxy resin, the current transformer and the voltage transformer are integrated, but the epoxy resin is easy to oxidize, and the service life of the current and voltage transformer is short.

And most of combined current and voltage transformers do not have a damping structure, after a winding in the voltage transformer is electrified, the iron core can vibrate under the action of an induction magnetic field, the vibration continuously exerts an acting force on a transformer shell, and a spring positioned outside is difficult to reduce the influence of the vibration on the transformer shell, so that the problems that the installation position between the bottom of the voltage transformer and a base is loosened and abraded are difficult to fundamentally solve, and the transformer is easy to damage due to the fact that the transformer is also vibrated under the influence of the outside when placed in the field for a long time.

A combined current and voltage transformer is needed to solve this problem.

SUMMERY OF THE UTILITY MODEL

To the above situation, for overcoming prior art's defect, the utility model aims at providing a modular current-voltage transformer, effectual solved current transformer and voltage transformer constitute the mutual-inductor interference killing feature poor, life weak point and easily receive the problem that vibrations influence leads to damaging.

The technical scheme of its solution is, the utility model includes a shell, a first slide plate and a second slide plate are slidably mounted in the shell, the upper end of the first slide plate and the lower end of the second slide plate are respectively provided with an upper shock-absorbing structure and a lower shock-absorbing structure, the upper end of the second slide plate is provided with a combined current-voltage transformer, the front, back, left and right sides of the combined current-voltage transformer are respectively provided with a baffle, the upper end and the lower end of the baffle are respectively fixedly connected with the first slide plate and the second slide plate, the baffle is provided with a plurality of springs, and the end parts of the springs are;

the upper damping structure comprises a first oil cavity arranged at the upper end in the shell, a vertical first piston is fixedly arranged at the upper end of the first sliding plate, a piston head of the first piston is arranged in the first oil cavity, a first oil storage chamber is arranged outside the first oil cavity, a first pressure compensation valve and a second pressure compensation valve which are communicated with the first oil cavity and the first oil storage chamber are respectively arranged at the upper side and the lower side of the side surface of the first oil cavity, and liquid is respectively arranged in the first oil cavity and the first oil storage chamber;

the lower damping structure comprises a second oil cavity arranged at the lower end in the shell, a vertical second piston is fixedly arranged at the lower end of the second sliding plate, a piston head of the second piston is arranged in the second oil cavity, a second oil storage chamber is arranged outside the second oil cavity, a third pressure compensation valve communicated with the second oil cavity and the second oil storage chamber is arranged on the lower side of the side surface of the second oil cavity, and liquid is arranged in the second oil cavity and the second oil storage chamber.

The utility model has the advantages that: the utility model discloses utilize effectual insulation measure, make current transformer and voltage transformer make an organic whole, make the cost greatly reduced of product, avoid in the past two kinds of simple piecing together and the combination of mutual-inductor in the low-voltage system, can be applicable to high pressure and superhigh pressure system, can realize the purpose of two kinds of functions of an equipment completion current transformer and voltage transformer, and the manufacturability is good, high durability and convenient use, it is simple to maintain, the casing adopts closed structure, structural connection is firm, do not have oily dirt outward, it is insulating effectual, the casing adopts rubber to have fine waterproof, it is ageing to prevent opening gluey, anti ultraviolet's effect, high performance, be applicable to electric power system in voltage, electric energy measurement and relay protection usefulness.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.

Example (b):

as shown in figure 1, the utility model comprises a shell 1, a first sliding plate 2 and a second sliding plate 3 are slidably mounted in the shell 1, namely the first sliding plate 2 and the second sliding plate 3 can slide up and down in the shell 1, the upper end of the first sliding plate 2 and the lower end of the second sliding plate 3 are respectively provided with an upper damping structure and a lower damping structure, the upper end of the second sliding plate 3 is provided with a combined current-voltage transformer, the combined current-voltage transformer mounted between the upper damping structure and the lower damping structure can be effectively reduced through the upper damping structure and the lower damping structure, baffles 4 are respectively arranged on the front, the back, the left and the right sides of the combined current-voltage transformer, the upper end and the lower end of each baffle 4 are respectively fixedly connected with the first sliding plate 2 and the second sliding plate 3, the first sliding plate 2, the second sliding plate 3 and the combined current-voltage transformer are fixedly connected through the baffles 4, a plurality of springs 5 are arranged on the baffles 4, the horizontal vibration of the combined current and voltage transformer can be reduced by the spring 5;

the upper damping structure comprises a first oil chamber 6 arranged at the upper end in the shell 1, the first oil chamber 6 is downward opened, a vertical first piston 7 is fixedly arranged at the upper end of the first sliding plate 2, a piston head of the first piston 7 is arranged in the first oil chamber 6, a piston rod of the first piston 7 is in sealing sliding connection with the opening of the first oil chamber 6, a first oil chamber 8 is arranged outside the first oil chamber 6, a first pressure compensation valve 9 and a second pressure compensation valve 10 which are communicated with the first oil chamber 6 and the first oil chamber 8 are respectively arranged at the upper side and the lower side of the side surface of the first oil chamber 6, liquid is respectively arranged in the first oil chamber 6 and the first oil chamber 8, when the first sliding plate 2 moves upwards, the piston extrudes the liquid at the upper side of the first oil chamber 6, the air pressure at the upper side of the first oil chamber 6 is enhanced, the liquid at the upper side of the first oil chamber 6 enters the first oil chamber 8 through the first pressure compensation valve 9, and when the pressure in the first oil chamber 8, the liquid in the first oil storage chamber 8 enters the lower side of the first oil chamber 6 through the first compensation valve, the vibration is relieved through molecular resistance of the liquid when the liquid moves between the first oil chamber 6 and the first oil storage chamber 8, and the valves form damping force of iron core vibration to retardation of the oil;

the lower shock absorption structure comprises a second oil chamber 11 arranged at the lower end in the shell 1, the opening of the second oil chamber 11 is upward, a vertical second piston 12 is fixedly arranged at the lower end of the second sliding plate 3, the piston head of the second piston 12 is arranged in the second oil chamber 11, a second oil chamber 13 is arranged outside the second oil chamber 11, a third pressure compensation valve communicated with the second oil chamber 11 and the second oil chamber 13 is arranged at the lower side of the side surface of the second oil chamber 11, liquid is arranged in the second oil chamber 11 and the second oil chamber 13, when the second sliding plate 3 moves downwards, the piston extrudes the liquid at the lower side of the second oil chamber 11 downwards, the air pressure at the lower side of the second oil chamber 11 is enhanced, the liquid at the lower side of the second oil chamber 11 enters the second oil chamber 13 through the second pressure compensation valve 10, the vibration is relieved through the molecular resistance of the liquid when the liquid moves between the second oil chamber 11 and the second oil chamber 13, and the damping iron core vibration is formed by the retardation of, when the second sliding plate 3 moves upwards, the air pressure at the lower side of the second oil tank is reduced, and then the liquid in the second oil storage chamber 13 enters the lower side of the second oil tank through the third compensation valve, so that the vibration generated when the combined current and voltage transformer operates can be effectively reduced.

In order to prevent the liquid in the first oil groove from flowing out of the first oil groove, a sealing ring 14 is arranged at the joint of the first piston 7 and the first oil chamber 6.

The combined current and voltage transformer comprises a first current transformer 15, a second current transformer 16, a first voltage transformer 17 and a second voltage transformer 18, wherein the top parts of the first voltage transformer 17 and the second voltage transformer 18 are respectively provided with a first binding post 19 and a second binding post 20 which are respectively arranged on the left side and the right side in an inclined manner, the first binding posts 19 of the first voltage transformer 17 and the second voltage transformer 18 are mutually communicated, the second binding posts 20 of the first voltage transformer 17 and the second voltage transformer 18 are respectively connected with the first current transformer 15 and the second current transformer 16, the lower end of the first sliding plate 2 is provided with a junction box 21 which connects the first current transformer 15 and the second current transformer 16 with the junction box 21, make line concentration box 21 carry out centralized management to the circuit of combination current-voltage transformer, can improve the efficiency of maintenance, all be equipped with outlet 22 on the lateral wall of casing 1 and baffle 4.

In order to maintain the insulation property in the housing 1, SF6 gas is provided in the housing 1.

The shell 1 is provided with an inflatable sealing pipeline 23 at the outlet 22, and when the line of the combined current and voltage transformer extends to the outside through the outlet 22, the inflatable sealing pipeline 23 is controlled to seal the shell 1, so that the shell 1 can be sealed.

In order to maintain the insulation inside the casing 1, the first current transformer 15, the second current transformer 16, the first voltage transformer 17 and the second voltage transformer 18 are all of an epoxy resin vacuum casting type structure.

In order to prevent the combined current-voltage transformer from being damaged due to short circuit when liquid in the first oil chamber 6 or the second oil chamber 11 leaks accidentally, the liquid is insulating oil.

The utility model discloses when using, the circuit that can directly stretch out through outlet 22 uses.

Claims

1. A combined current-voltage transformer comprises a shell (1) and is characterized in that a first sliding plate (2) and a second sliding plate (3) are arranged in the shell (1) in a sliding mode, the upper end of the first sliding plate (2) and the lower end of the second sliding plate (3) are respectively provided with an upper damping structure and a lower damping structure, the upper end of the second sliding plate (3) is provided with a combined current-voltage transformer, baffles (4) are arranged on the front side, the rear side, the left side and the right side of the combined current-voltage transformer, the upper end and the lower end of each baffle (4) are respectively fixedly connected with the first sliding plate (2) and the second sliding plate (3), a plurality of springs (5) are arranged on each baffle (4), and the end portions of the springs (5) are; the upper damping structure comprises a first oil cavity (6) arranged at the upper end in the shell (1), a vertical first piston (7) is fixedly arranged at the upper end of the first sliding plate (2), a piston head of the first piston (7) is arranged in the first oil cavity (6), a first oil storage chamber (8) is arranged outside the first oil cavity (6), a first pressure compensation valve (9) and a second pressure compensation valve (10) which are communicated with the first oil cavity (6) and the first oil storage chamber (8) are respectively arranged on the upper side and the lower side of the side surface of the first oil cavity (6), and liquid is respectively arranged in the first oil cavity (6) and the first oil storage chamber (8); lower shock-absorbing structure is including installing second oil chamber (11) of lower extreme in casing (1), second slide (3) lower extreme fixed mounting has vertical second piston (12), the piston head of second piston (12) is installed in second oil chamber (11), second oil chamber (11) are equipped with second oil storage chamber (13) outward, the downside of the side of second oil chamber (11) is equipped with the third pressure compensation valve of intercommunication second oil chamber (11) and second oil storage chamber (13), all be equipped with liquid in second oil chamber (11) and the second oil storage chamber (13).

2. The combined current and voltage transformer of claim 1, wherein a sealing ring (14) is arranged at the joint of the first piston (7) and the first oil chamber (6).

3. The combined current-voltage transformer of claim 1, characterized in that the combined current-voltage transformer comprises a first current transformer (15), a second current transformer (16), a first voltage transformer (17) and a second voltage transformer (18), the top of the first voltage transformer (17) and the top of the second voltage transformer (18) are respectively provided with a first terminal (19) and a second terminal (20) which are respectively arranged on the left side and the right side in an inclined manner, the first terminals (19) of the first voltage transformer (17) and the second voltage transformer (18) are communicated with each other, the second terminals (20) of the first voltage transformer (17) and the second voltage transformer (18) are respectively connected with the first current transformer (15) and the second current transformer (16), the lower end of the first sliding plate (2) is provided with a junction box (21), the side wall of the shell (1) and the baffle (4) are provided with wire outlets (22).

4. A combined current and voltage transformer according to claim 1, characterized in that said housing (1) is filled with SF6 gas.

5. The combined current and voltage transformer of claim 1, wherein said housing (1) is provided with an inflatable sealed conduit (23) at the outlet (22).

6. A combined current and voltage transformer according to claim 3, characterised in that said first (15), second (16), first (17) and second (18) transformers are all of epoxy vacuum cast construction.

7. The combined current and voltage transformer of claim 1, wherein said liquid is an insulating oil.