CN111816434A

CN111816434A - Anti-harmonic oil-immersed intelligent distribution transformer

Info

Publication number: CN111816434A
Application number: CN202010734389.8A
Authority: CN
Inventors: 赵建永; 李茂宏; 李燚; 邓勇军; 李忠华; 张元忍
Original assignee: Chongqing Yuantong Electrical Appliance Equipment Mfg Co ltd
Current assignee: Chongqing Yuantong Electrical Appliance Equipment Mfg Co ltd
Priority date: 2020-07-24
Filing date: 2020-07-24
Publication date: 2020-10-23

Abstract

The invention provides an anti-harmonic oil immersed intelligent distribution transformer, which comprises an oil tank, wherein shells are fixedly arranged on two sides of the oil tank, fixed frames are fixedly arranged at the bottom in the shells, a transformer body is fixedly arranged in the fixed frames, the bottom end of the oil tank is fixed on the ground through a base, the transformer body comprises a magnetic core and a coil wound on the outer wall of the magnetic core, the connection group of the coil is Dzn0, a current transformer, a multifunctional protection sensing device and an intelligent controller are arranged at the bottom of the oil tank, the current transformer and the multifunctional sensing device are connected with an intelligent control box, the multifunctional sensing device comprises an oil temperature sensor, an oil level sensor, a heavy gas sensor, a light gas sensor and a pressure sensor, the invention selects the connection group Dzn0 with a filtering function to improve the anti-harmonic capacity of the transformer, thereby improving the quality of the electric energy.

Description

Anti-harmonic oil-immersed intelligent distribution transformer

Technical Field

The invention relates to the technical field of 10kV oil-immersed transformers, in particular to an anti-harmonic oil-immersed intelligent distribution transformer.

Background

At present, a 10kV distribution transformer is poor in harmonic resistance and poor in power supply quality. The distribution transformer is in heavy overload operation in short time periods in busy seasons and spring seasons, while ordinary products can only be safely operated for a long time under rated capacity, and the distribution transformer is in heavy overload and even burns out in peak periods of power utilization. During the operation of the transformer, operation and maintenance personnel cannot remotely monitor, transmit and alarm the current, voltage, oil temperature, oil level, heavy gas, light gas and pressure release conditions of the transformer in real time, and cannot find potential safety hazards in the power utilization process in time. The common paraffin-based or naphthenic transformer oil can not be biodegraded and has pollution to the environment. The common transformer does not adopt a short-circuit resistance measure, and the short-circuit resistance is very weak; the main insulating material adopts wood pulp insulating paper, and the operation of the transformer under the conventional condition can only be met, so that a new transformer is urgently needed to solve the technical problem in the prior art.

Disclosure of Invention

In order to solve the technical problem, an embodiment of the invention provides an anti-harmonic oil-immersed intelligent distribution transformer which comprises an oil tank, wherein shells are fixedly installed on two sides of the oil tank, fixing frames are fixedly installed at the bottom in the shells, a transformer body is fixedly installed in the fixing frames, the bottom end of the oil tank is fixed on the ground through a base, the transformer body comprises a magnetic core and a coil wound on the outer wall of the magnetic core, the connection group of the coil is Dzn0, a current transformer, a multifunctional protection sensing device and an intelligent controller are arranged at the bottom of the oil tank, and the current transformer and the multifunctional sensing device are connected with an intelligent control box.

Further, the multifunctional sensing device comprises an oil temperature sensor, an oil level sensor, a heavy gas sensor, a light gas sensor and a pressure sensor.

Further, intelligent control case and mobile terminal wireless connection, the intelligent control case is used for sending current, voltage, oil temperature, oil level, heavy gas, light gas and the pressure release signal that current transformer and multi-functional sensing device detected to mobile terminal.

Further, the oil in the oil tank is DL-7 vegetable oil.

Further, the interlayer insulating layer of the coil is made of Nomex910 insulating 0.08 all-purpose adhesive paper with the heat resistance grade of B.

The invention has the beneficial effects that:

1) the connection group Dzn0 with the filtering function is selected, so that the harmonic wave resistance of the transformer is improved, and the electric energy quality is improved;

2) the current transformer, the multifunctional protection sensing device and the intelligent controller are additionally arranged on the transformer, so that the current, voltage, oil temperature, oil level, heavy gas, light gas and pressure release conditions can be monitored on the PC end and the mobile phone APP in real time, potential safety hazards in the power utilization process can be found in time, and the working pressure of power utilization operation and maintenance personnel is greatly reduced;

3) the invention adopts DL-7 vegetable oil to replace common paraffin-base or naphthenic transformer oil, has biodegradability of 77% in 28 days, and has zero environmental pollution.

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

Drawings

The accompanying drawings, which are included to provide a further understanding 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 principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of an anti-harmonic oil-immersed intelligent distribution transformer in an embodiment of the present invention.

Fig. 2 is a block flow diagram of an anti-harmonic oil-immersed intelligent distribution transformer in the embodiment of the present invention.

Fig. 3 is a schematic diagram of low voltage wiring in an embodiment of the invention.

Description of the drawings: 10-an oil tank, 11-a current transformer, 12-a multifunctional protection sensing device, 121-an oil temperature sensor, 122-an oil level sensor, 123-a heavy gas sensor, 124-a light gas sensor, 125-a pressure sensor, 13-an intelligent controller, 14-an oil pipe, 20-a shell, 30-a fixed frame, 40-a transformer body, 41-a magnetic core, 42-a coil, 50-a base and 60-a mobile terminal.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, 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 accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; 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.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

Referring to fig. 1-3, fig. 1 is a schematic structural diagram of an anti-harmonic oil-immersed intelligent distribution transformer according to an embodiment of the present invention, the transformer comprises an oil tank 10, a shell 20 is fixedly arranged on both sides of the oil tank 10, a fixing frame 30 is fixedly arranged on the bottom in the shell 20, the fixed frames 30 are all fixedly provided with a transformer body 40, the bottom end of the oil tank 10 is fixed on the ground through a base 50, the transformer body 40 includes a magnetic core 41 and a coil 42 wound around an outer wall of the magnetic core 41, the connection group of the coil 42 is Dzn0, the bottom of the oil tank 10 is provided with a current transformer 11, a multifunctional protection sensing device 12 and an intelligent controller 13, the current transformer 11 and the multifunctional sensing device 12 are both connected with the intelligent control box 13, the multifunctional sensing device 12 is connected with the intelligent control box 13 through an oil pipe 14.

In some preferred embodiments, the multi-function sensing device 12 includes an oil temperature sensor 121, an oil level sensor 122, a heavy gas sensor 123, a light gas sensor 124, and a pressure sensor 125.

In some preferred embodiments, the intelligent control box 12 is wirelessly connected to the mobile terminal 60, and the intelligent control box 12 is configured to transmit the current, the voltage, the oil temperature, the oil level, the heavy gas, the light gas and the pressure release signal detected by the current transformer 11 and the multifunctional sensing device 12 to the mobile terminal 60.

In other preferred embodiments, the oil in the tank 10 is DL-7 vegetable oil.

In certain preferred embodiments, the interlayer insulating layer of the coil (42) is made of Nomex910 insulating 0.08 all-purpose adhesive paper with a B-class heat resistance.

The working principle of the invention is as follows:

the connection group Dzn0 with the filtering function is selected, so that the harmonic wave resistance of the transformer is improved, and the power quality is improved.

1) The third harmonic of the input power supply is enclosed in the input triangular winding and cannot be conducted to the output end through electromagnetic induction, but the third harmonic can generate additional third harmonic heat loss on the input winding, and the K coefficient tolerance of the transformer is reduced.

2) The third harmonic generated by the output load passes through the output winding to generate additional third harmonic heat loss on the output winding, but because the output winding is in zigzag connection, each column (phase) of the output winding of the transformer is provided with two groups of third harmonic currents with opposite directions and basically equal quantity, the electromagnetic induction is basically counteracted, thus the third harmonic heat loss can not be induced to the input end, the input winding can not generate additional harmonic heat loss, and because the harmonic is mainly the third harmonic (about more than forty percent), the K coefficient tolerance capability of the transformer is greatly improved; if load balance and three-phase voltage are basically balanced, zero-sequence current detected on the zero line of the transformer is much smaller than zero-sequence current detected on the zero line of the Dyn11 transformer, so that zero-line copper bars with the same design section and Dzn0 transformer zero-line copper bars have much smaller loss, and the K coefficient tolerance of the transformer is greatly improved.

3) The zero sequence impedance of the Dzn0 transformer is very small, the third harmonic current is zero sequence current, because the proportion of filtering the third harmonic will be reduced due to the unbalanced load and the unbalanced three-phase voltage, and the generated third harmonic zero sequence current can easily flow into the ground through the neutral point of the output winding.

4) In addition, install current transformer, multi-functional protection sensing device and intelligent control ware additional on the transformer, can be on PC end and cell-phone APP real time monitoring electric current, voltage, oil temperature, oil level, heavy gas, light gas, the pressure release condition, in time discover the potential safety hazard in the power consumption in-process to alleviate power consumption fortune dimension personnel's operating pressure greatly.

In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.

Claims

1. The utility model provides an anti-harmonic oil-immersed intelligent distribution transformer, includes oil tank (10), the equal fixed mounting in oil tank (10) both sides has shell (20), the equal fixed mounting in bottom has mount (30) in shell (20), equal fixed mounting has transformer body (40), its characterized in that in mount (30): the oil tank (10) bottom is passed through base (50) and is fixed on ground, transformer body (40) include magnetic core (41) and wind coil (42) of magnetic core (41) outer wall, the hookup group of coil (42) is Dzn0, oil tank (10) bottom is equipped with current transformer (11), multi-functional protection sensing device (12) and intelligent control ware (13), current transformer (11) with multi-functional sensing device (12) all with intelligent control case (13) are connected.

2. The anti-harmonic oil-immersed intelligent distribution transformer of claim 1, wherein: the multifunctional sensing device (12) comprises an oil temperature sensor (121), an oil level sensor (122), a heavy gas sensor (123), a light gas sensor (124) and a pressure sensor (125).

3. The anti-harmonic oil-immersed intelligent distribution transformer of claim 2, wherein: the intelligent control box (12) is in wireless connection with the mobile terminal (60), and the intelligent control box (12) is used for sending current, voltage, oil temperature, oil level, heavy gas, light gas and pressure release signals detected by the current transformer (11) and the multifunctional sensing device (12) to the mobile terminal (60).

4. The anti-harmonic oil-immersed intelligent distribution transformer of claim 1, wherein: the oil in the oil tank (10) is DL-7 vegetable oil.

5. The anti-harmonic oil-immersed intelligent distribution transformer of claim 1, wherein: the interlayer insulating layer of the coil (42) is made of Nomex910 insulating 0.08 all-purpose adhesive paper with the heat resistance grade of B.