WO2023092628A1 - 35 kv dry-type single-phase combined test transformer - Google Patents

Abstract

Disclosed is a 35 kV dry-type single-phase combined test transformer, comprising four single-phase transformers, wherein a double-leg iron core comprising two iron core legs is arranged in each single-phase transformer, a high-voltage coil and a low-voltage coil are wound on the double-leg iron core, and the four high-voltage coils are sequentially connected in series. According to the present invention, the transformer is decomposed into a series combination of four single-phase transformers having smaller capacity, so that the overall size of the transformer is changed, the transformer is more suitable for the size of a container, the transportation of the transformer is not limited by the height of the container, and the internal space of the container can be fully utilized. In addition, the height of center of gravity of the transformer is lowered, so that the transformer can adapt to various road conditions in transportation, thereby ensuring safe transportation of the transformer, and ensuring the safety of a vehicle-mounted detection system in the transportation process; moreover, the transformer in the present invention can obtain smaller short-circuit impedance more conveniently after being disassembled.

Description

A 35KV dry-type single-phase combined test transformer

Application field

The invention relates to the field of dry-type transformers, in particular to a 35kV dry-type single-phase combined test transformer.

Background technique

The mobile vehicle-mounted containerized electrical test system can test electrical equipment on site, and the 35kV dry-type transformer is used to generate the 35kV power required for the test. Generally, through a three-phase double-winding step-up transformer, three single-phase double-winding step-up transformers form a three-phase transformer to realize the required three-phase 35kV test power supply. The specified voltage is input at low voltage, and the required test voltage of 35kV is output at high voltage. And it is required that the test transformer has a small short-circuit impedance, usually less than 2%.

However, for vehicle-mounted mobile test systems, all electrical equipment is installed inside the container. When the transformer capacity is large, the length and height of the transformer are large. Limited by the size of the mobile vehicle-mounted container, the layout of the transformer in the box Difficult, the insulation distance cannot meet the safe operation requirements of the transformer. In addition, the height of the transformer is high, and the center of gravity is high. For the vehicle-mounted mobile test system, it is easy to bump when the road conditions are bad, and there is a certain risk.

Contents of the invention

The present invention overcomes the shortcomings of the prior art that the test transformer is large in size, high in height, and inconvenient for transportation, and provides a 35kV dry-type single-phase combined test transformer. A 35kV dry-type single-phase combined test transformer, including: four single-phase transformers, each of which includes a double-column core with two core columns, and the double-column core is on the A high-voltage coil and a low-voltage coil are provided, and the four high-voltage coils are serially connected in series.

In a preferred embodiment of the present invention, it also includes an upper clamp and a lower clamp for fixing four single-phase transformers, the upper clamp and the lower clamp are both frame-shaped, and the upper clamp is located at On the top of the four single-phase transformers, the lower clamp is located on the top of the four single-phase transformers.

In a preferred embodiment of the present invention, the high-voltage coils are connected in series through copper rods, the two ends of the copper rods are fixed with first terminals, and the outgoing ends of the high-voltage coils are fixed with second terminals. The first connection terminal and the second connection terminal are cylindrical, the sides of the first connection terminal and the second connection terminal are provided with external threads, the first connection terminal is sleeved in a copper nut, the The copper nut is screwed into the second connection terminal so that the electrical contact surface on the first connection terminal is electrically connected to the electrical contact surface at the bottom of the second connection terminal.

In a preferred embodiment of the present invention, the surface of the copper rod and the connection between the first connection terminal and the second connection terminal are all provided with insulating coating.

In a preferred embodiment of the present invention, the four single-phase transformers are arranged in a 2×2 matrix, and the arrangement directions of the core columns in the four cores are consistent; The direction is column, the first row of the four single-phase transformer matrix is the first single-phase transformer and the second single-phase transformer from left to right, and the second row is the third single-phase transformer and the fourth single-phase transformer from left to right transformer.

In a preferred embodiment of the present invention, the high-voltage coil of the double-column core goes out to the direction close to the double-column core in the same row, and the low-voltage coil of the double-column core goes away from the double-column core in the same row. The direction of the iron core goes out.

In a preferred embodiment of the present invention, the connection mode of the low-voltage coil is changed to adapt to different input voltage values.

In a preferred embodiment of the present invention, the connection method is to connect the first single-phase transformer, the second single-phase transformer, the third single-phase transformer and the fourth single-phase transformer in parallel.

In a preferred embodiment of the present invention, the connection method is that the first single-phase transformer and the second single-phase transformer are connected in series to form a first combination, and the third single-phase transformer and the fourth single-phase transformer The transformers are connected in series in a second combination, and the first combination is connected in parallel with the second combination.

In a preferred embodiment of the present invention, the connection method is that the first single-phase transformer, the second single-phase transformer, the third single-phase transformer and the fourth single-phase transformer are connected in series.

The present invention solves the defect existing in the background technology, and the present invention has the following beneficial effects:

(1) The present invention changes the external dimensions of the transformer by decomposing the transformer into a series combination of four single-phase transformers with smaller capacity, which is more suitable for the size of the container, and its transportation is not limited by the height of the container, and can be fully utilized The interior space of the container. At the same time, the height of the center of gravity of the transformer is lowered, which can adapt to various road conditions during transportation, ensure its safe transportation, and ensure the safety of the on-board detection system during transportation; at the same time, the transformer in the present invention can be more conveniently obtained after disassembly. short-circuit impedance.

(2) In the present invention, the four single-phase transformers are combined into two parts that can be lifted and transported independently through the upper clamp and the lower clamp respectively, and are installed on the base, and the upper part is connected by a reinforcing beam to form a stable Overall.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain the drawings of other embodiments according to these drawings without creative work.

Fig. 1 is a kind of 35kV dry-type single-phase combined type test transformer schematic diagram described in an embodiment of the present invention;

Fig. 2 is a schematic diagram of a single-phase transformer in a 35kV dry-type single-phase combined test transformer described in an embodiment of the present invention;

Fig. 3 is a schematic diagram of a 35kV dry-type single-phase combined test transformer described in an embodiment of the present invention;

Fig. 4 is a front view of a 35kV dry-type single-phase combined test transformer described in an embodiment of the present invention;

Fig. 5 is the side view of a kind of 35kV dry-type single-phase combined type test transformer described in an embodiment of the present invention;

Fig. 6 is a schematic diagram of high-voltage coil connection of a 35kV dry-type single-phase combined test transformer described in an embodiment of the present invention;

Fig. 7 is a schematic diagram of the first connection mode of a low-voltage coil in a 35kV dry-type single-phase combined test transformer described in an embodiment of the present invention;

Fig. 8 is a schematic diagram of the second connection method of the medium and low voltage coils of a 35kV dry-type single-phase combined test transformer described in an embodiment of the present invention;

Fig. 9 is a schematic diagram of the third connection mode of the medium and low voltage coils of a 35kV dry-type single-phase combined test transformer described in an embodiment of the present invention.

The reference signs are as follows: 10, single-phase transformer; T1, the first single-phase transformer; A1, the first outlet of the high-voltage coil of the first single-phase transformer; X1, the end outlet of the high-voltage coil of the first single-phase transformer; a1, the first outlet of the low-voltage coil of the first single-phase transformer; x1, the outlet of the end of the low-voltage coil of the first single-phase transformer; T2, the second single-phase transformer; A2, the head of the high-voltage coil of the second single-phase transformer Outlet end; X2, the end outlet end of the high-voltage coil of the second single-phase transformer; a2, the first outlet end of the low-voltage coil of the second single-phase transformer; x2, the end outlet end of the low-voltage coil of the second single-phase transformer; T3, The third single-phase transformer; A3, the first outlet of the high-voltage coil of the third single-phase transformer; X3, the end outlet of the high-voltage coil of the third single-phase transformer; a3, the first outlet of the low-voltage coil of the third single-phase transformer ; x3, the end of the low-voltage coil of the third single-phase transformer; T4, the end of the fourth single-phase transformer; A4, the end of the high-voltage coil of the fourth single-phase transformer; X4, the end of the high-voltage coil of the fourth single-phase transformer Head outlet; a4, the first outlet of the low-voltage coil of the fourth single-phase transformer; x4, the end outlet of the low-voltage coil of the fourth single-phase transformer; 201, iron core, 2011, iron core column; 202, high-voltage coil; 203, Low-voltage coil; 301, upper clamp; 302, lower clamp; 303, reinforcing beam; 304, base; 305, copper rod; 306, first terminal; 307, second terminal; 308, copper nut; 309, Electrical contact surface; 310, insulation coating.

Detailed ways

In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. structure, so it only shows the configuration related to the present invention, and it should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientation or positional relationship indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and Simplified descriptions do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be interpreted as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, a feature defined as "first", "second", etc. may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of this application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application based on specific situations.

In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

As shown in Figure 1-2, the three-phase test transformer in the present invention is composed of three 35kV dry-type single-phase combined test transformers, a 35kV dry-type single-phase combined test transformer, including: four single-phase Each single-phase transformer 10 is provided with a double-column core 201 including two core columns 2011 inside each single-phase transformer 10. A high-voltage coil 202 and a low-voltage coil 203 are provided on the double-column core 201. The four high-voltage coils 202 are arranged in turn. in series.

The principle of the single-phase double-column transformer is shown in FIG. 2 . Given an input voltage, it passes through the magnetic flux changes of two core columns 2011 to obtain an output voltage.

的大容量的单相变压器。 As shown in Figure 3, in the present invention, a dry-type single-phase combined test transformer is decomposed into 4 single-phase transformers 10 with smaller capacity, and through the series connection of high-voltage coils 202, a rated voltage of

large-capacity single-phase transformers.

One point that needs to be explained is that the four single-phase transformers 10 are identical, and the iron core 201 adopts a single-phase double-column structure. And there is no magnetic connection between the four single-phase transformers 10, only electrical connection.

Obviously, the height of the disassembled transformer is lower, its transportation is not restricted by the height of the container, and the center of gravity is lower than before, which can adapt to various road conditions during transportation and ensure its safe transportation. Moreover, dismantling a single-phase test transformer into four small single-phase transformers 10 can also facilitate obtaining a smaller short-circuit impedance.

As shown in Figure 1, in a specific embodiment of the present invention, four single-phase transformers 10 are arranged in a 2×2 matrix, and the arrangement directions of the iron core columns 2011 in the four iron cores 201 are consistent; the arrangement directions of the iron core columns 2011 are Row, the direction perpendicular to the arrangement direction is the column, four single-phase transformers 10 matrix The first row from left to right is the first single-phase transformer T1 and the second single-phase transformer T2, the second row from right to left is the third A single-phase transformer T3 and a fourth single-phase transformer T4. Such an arrangement makes the four single-phase transformers 10 more compact and saves a lot of space.

Moreover, the high-voltage coil 202 of the double-column core 201 goes out to the direction close to the double-column core 201 in the same row, and the low-voltage coil 203 of the double-column core 201 goes out to the direction away from the double-column core 201 in the same row. In this way, the wiring is neat and not confusing, and the second is space-saving and easy to operate.

Specifically refer to Figure 1 and Figure 3, where T1 is the first single-phase transformer, A1 is the first outlet of the high-voltage coil of the first single-phase transformer, X1 is the end outlet of the high-voltage coil of the first single-phase transformer, a1 is the first outlet of the low-voltage coil of the first single-phase transformer, x1 is the end outlet of the low-voltage coil of the first single-phase transformer, T2 is the second single-phase transformer, and A2 is the first outlet of the high-voltage coil of the second single-phase transformer X2 is the end of the high-voltage coil of the second single-phase transformer, a2 is the end of the low-voltage coil of the second single-phase transformer, x2 is the end of the low-voltage coil of the second single-phase transformer, and T3 is the end of the second single-phase transformer. Three single-phase transformers, A3 is the first outlet of the high-voltage coil of the third single-phase transformer, X3 is the end outlet of the high-voltage coil of the third single-phase transformer, a3 is the first outlet of the low-voltage coil of the third single-phase transformer, X3 is the end of the low-voltage coil of the third single-phase transformer, T4 is the end of the fourth single-phase transformer, A4 is the first outlet of the high-voltage coil of the fourth single-phase transformer, X4 is the end of the high-voltage coil of the fourth single-phase transformer Outlet terminal, a4 is the first outlet terminal of the low-voltage coil of the fourth single-phase transformer, x4 is the end outlet terminal of the low-voltage coil of the fourth single-phase transformer, and its arrangement is compact and easy to fix.

As shown in Figure 1 and Figures 4-5, in a 35kV dry-type single-phase combined test transformer according to the present invention, it also includes an upper clamp 301 and a lower clamp for fixing four single-phase transformers 10 302, the upper clamping part 301 and the lower clamping part 302 are both frame-shaped, the upper clamping part 301 is located on the top of the four single-phase transformers 10, and the lower clamping part 302 is located on the top of the four single-phase transformers.

Specifically, in the present invention, the four single-phase transformers are combined into two parts that can be lifted and transported independently through the upper clamp 301 and the lower clamp 302 respectively, and are installed on the base 304, and the upper part is passed through the reinforcing beam. 303 connections to form a solid whole. Wherein, the arrangement direction of the reinforcement beams 303 is the same as the arrangement direction of the iron core 201 .

As shown in Figure 6, in the present invention, the high-voltage coil 202 is connected in series through a copper rod 305, the two ends of the copper rod 305 are fixed with a first terminal 306, and the outlet end of the high-voltage coil 202 is fixed with a second terminal 307, The first connection terminal 306 and the second connection terminal 307 are cylindrical, and the sides of the first connection terminal 306 and the second connection terminal 307 are all provided with external threads, and the first connection terminal 306 is sleeved in the copper nut 308, and the copper nut 308 and The second connection terminal 307 is screwed to electrically connect the electrical contact surface 309 on the first connection terminal 306 with the electrical contact surface 309 at the bottom of the second connection terminal 307 .

Here, the original plug-in connection is abandoned, but a first connecting terminal 306 and a second connecting terminal 307 that cooperate with each other are set between the copper rod 305 and the high-voltage coil 202, and are fastened by a copper nut 308, and the copper The bottom of the nut 308 is stuck on the bottom of the first connection terminal 306 to prevent it from slipping, and its operation reliability is higher.

At the same time, the mobile test system must consider the insulation performance under high altitude conditions due to the uncertain installation location of the test product. For dry-type transformers, the 35kV side terminals are generally exposed in the air, which is the weak point of insulation. Ensuring the insulation strength of the terminals on the 35kV side is the key point to ensure that the transformer can adapt to high altitudes.

Continuing to refer to FIG. 6 , in the present invention, the surface of the copper rod 305 and the connection between the first connection terminal 306 and the second connection terminal 307 are all provided with an insulating coating 310 . Since the connection part does not form a cross structure, the insulating coating 310 has good manufacturability, which can ensure that the transformer meets the requirements of an altitude of 4000m.

In the present invention, it is possible to adapt to different input voltage values by changing the connection mode of the low-voltage coil 203, that is to say, the transformer in the present invention can adapt to different input voltages so that its output voltage remains at

Referring to Figure 7, when the input voltage is the lowest voltage U1, the low-voltage coil is connected in the following way: the first single-phase transformer T1, the second single-phase transformer T2, the third single-phase transformer T3 and the fourth single-phase transformer T4 in parallel.

Referring to Figure 8, when the input voltage is the intermediate voltage U2, the low-voltage coil is connected in the following way: the first single-phase transformer T1 and the second single-phase transformer T2 are connected in series to form the first combination, and the third single-phase transformer T3 and the fourth single-phase transformer T3 are connected in series. The single-phase transformer T4 is connected in series to form the second combination, and the first combination and the second combination are connected in parallel.

Referring to Figure 9, when the input voltage is the highest voltage U3, the low-voltage coils are connected in the following ways: the first single-phase transformer T1, the second single-phase transformer T2, the third single-phase transformer T3 and the fourth single-phase transformer T4 in series .

That is to say, in the present invention, a single-phase test transformer is disassembled into four small single-phase transformers 10, and the voltage ratio of the input voltage and the output voltage can be adjusted through different connection modes of the low-voltage coil 203, so as to adapt to different The input voltage has a higher matching degree.

To sum up, the present invention changes the external dimensions of the transformers by decomposing the transformers into series combinations of four single-phase transformers with smaller capacity, which is more suitable for the size of the container and can make full use of the internal space of the container. At the same time, the center of gravity of the transformer is lowered to ensure the safety of the on-board detection system during transportation.

The above examples only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the scope of the patent for the invention. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

A 35kV dry-type single-phase combined test transformer is characterized in that it includes: four single-phase transformers, and each of the single-phase transformers includes a double-column core with two core columns, and the double-column A high-voltage coil and a low-voltage coil are provided on the iron core, and the four high-voltage coils are connected in series in sequence. A 35kV dry-type single-phase combined test transformer according to claim 1, characterized in that: it also includes an upper clamp and a lower clamp for fixing four single-phase transformers, the upper clamp and the The lower clamps are all frame-shaped, the upper clamps are located on the top of the four single-phase transformers, and the lower clamps are located on the top of the four single-phase transformers. A 35kV dry-type single-phase combined test transformer according to claim 1, characterized in that: the high-voltage coils are connected in series through copper rods, the two ends of the copper rods are fixed with first terminals, and the The outlet end of the high-voltage coil is fixed with a second connection terminal, the first connection terminal and the second connection terminal are cylindrical, and the sides of the first connection terminal and the second connection terminal are both provided with external threads, The first connecting terminal is sleeved in a copper nut, and the copper nut is screwed with the second connecting terminal so that the electrical contact surface on the first connecting terminal is electrically connected to the electrical contact surface at the bottom of the second connecting terminal. connect. A 35kV dry-type single-phase combined test transformer according to claim 3, characterized in that: the surface of the copper rod and the connection between the first terminal and the second terminal are provided with insulation clad. A 35kV dry-type single-phase combined test transformer according to claim 1, characterized in that: the four single-phase transformers are arranged in a 2×2 matrix, and the arrangement directions of the core columns in the four cores are the same; The arrangement direction of the columns is a row, and the direction perpendicular to the arrangement direction is a column. The first row of the four single-phase transformer matrices is the first single-phase transformer and the second single-phase transformer from left to right, and the second row is from From right to left are the third single-phase transformer and the fourth single-phase transformer. A 35kV dry-type single-phase combined test transformer according to claim 5, characterized in that: the high-voltage coil of the double-column core goes out to the direction close to the double-column core in the same row, and the double-column core The low-voltage coil of the iron core goes out to the direction away from the double-column iron core in the same row. A 35kV dry-type single-phase combined test transformer according to claim 5, characterized in that: the connection mode of the low-voltage coil is changed to adapt to different input voltage values. A 35kV dry-type single-phase combined test transformer according to claim 7, characterized in that: the connection method is that the first single-phase transformer, the second single-phase transformer, the third The single-phase transformer is connected in parallel with the fourth single-phase transformer. A 35kV dry-type single-phase combined test transformer according to claim 7, characterized in that: the connection method is that the first single-phase transformer and the second single-phase transformer are connected in series to form a first combination, The third single-phase transformer and the fourth single-phase transformer are connected in series to form a second combination, and the first combination and the second combination are connected in parallel. A 35kV dry-type single-phase combined test transformer according to claim 7, characterized in that: the connection method is that the first single-phase transformer, the second single-phase transformer, the third single-phase A phase transformer is connected in series with the fourth single-phase transformer.

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