CN206134443U - A power transformer with 10kV and 6.6kV voltage conversion output - Google Patents

Abstract

The utility model discloses a power transformer with a voltage conversion output of 10kV and 6.6kV, which is suitable for a power transformer with a voltage conversion output capacity of 3150KVA or below. The low-voltage coil is divided into three coils, that is, the first coil and the second coil. and the third coil; the ratio of turns corresponding to the three coils is 3.2:3.4:3.4, all of which are conventional cylindrical coils, and the first coil is a common coil inside; the second coil and the third coil are outside, they Axial distribution and series-parallel connection of coils through series-parallel switches to achieve voltage conversion. The utility model can realize that one transformer supports outputting two kinds of voltages of 10kV and 6.6kV at the same time, so that both power grids can work without making two transformers, which saves resources.

Description

A power transformer with 10kV and 6.6kV voltage conversion output

technical field

The utility model relates to the technical field of power transformer equipment, in particular to a power transformer for converting and outputting 10kV and 6.6kV voltages.

Background technique

At present, due to historical reasons in many countries in Africa, the public distribution system adopts two voltage levels of 10kV and 6.6KV as the main distribution voltage. Therefore, the output voltage of the intermediate transformer is 10kV and 6.6KV. In order to save costs, It is necessary to design two voltages that meet the low-voltage output of 10kV and 6.6KV.

Utility model content

The purpose of this utility model is to provide a 10kV and 6.6kV voltage conversion output power transformer, the output voltage of which can be switched between 10kV and 6.6kV, which saves resources and solves the problems raised in the above-mentioned background technology.

In order to achieve the above purpose, the utility model provides the following technical solutions: a power transformer for 10kV and 6.6kV voltage conversion output, including a coil and a transfer switch, the transfer switch consists of a first gear switch, a second gear switch, a second Composed of a three-position switch, a fourth-position switch and a grounding switch, the first-position switch, the second-position switch, the third-position switch, the fourth-position switch and the grounding switch are all circuit-connected with a high-voltage output line, and The first gear switch, the second gear switch, the third gear switch and the fourth gear switch are electrically connected through a terminal; the coil is divided into a first coil, a second coil and a third coil, The first coil, the second coil and the third coil are axially distributed on the transformer casing, and the first coil is a common coil distributed inside the transformer casing, and the second coil and the third coil are distributed on the transformer casing External: the wiring ports of the first coil are respectively provided with A1 interface and A2 interface, the wiring ports of the second coil are respectively provided with B1 interface and B2 interface, and the wiring ports of the third coil are respectively provided with C1 interface and C2 interface; The A2 interface and the B1 interface are connected in parallel to the first gear switch through a wire, and the output end of the B2 interface is connected in series to the second gear switch through a wire; the C1 interface on the third coil is connected in series to the third gear through a wire On the position switch, its C2 interface is connected in series with the fourth position switch through a wire.

As a further solution of the present invention: the maximum output capacity of the high-voltage output line is 3150KVA.

As a further solution of the present invention: the ratio of turns of the first coil, the second coil and the third coil is 3.2:3.4:3.4, and the winding methods are all conventional cylindrical coils.

As a further solution of the present invention: when the terminal is electrically connected between the second gear switch and the third gear switch, the output voltage of the high-voltage output line is 10 kV.

As a further solution of the utility model: when the terminal is electrically connected between the second gear switch and the fourth gear switch, the third gear switch and the first gear switch, the output voltage of the high-voltage output line is 6.6kV.

Compared with the prior art, the utility model has beneficial effects: the power transformer for converting and outputting 10kV and 6.6kV voltages can switch between the two voltages of 10kV and 6.6kV by adopting the low-voltage coils in series and parallel structures. When the output voltage of the transformer is 10kV, when the terminal is electrically connected between the second gear switch and the third gear switch, all other gear switches are disconnected, so that the first coil, the second coil and the third coil The three coils are connected in series, that is, 3.2+(3.4+3.4)=10kV, and the output voltage of the high-voltage output line is 10kV; when the output voltage of the transformer is 6.6kV, the terminals are electrically connected to the second gear switch and the When between the fourth gear switch, the third gear switch and the first gear switch, the other gear switches are disconnected, so that the second coil and the third coil are connected in parallel and then connected in series with the first coil, which is 3.2+( 3.4//3.4) = 6.6kV, the output voltage of the high-voltage output line is 6.6kV, so that the voltage output of the power transformer can be converted between 6.6kV and 10kV, and this structure is adopted to ensure that the low voltage is in the case of outputting two voltages In this case, the connection group of the transformer remains unchanged, and half of the working current flows through the second coil and the third coil when they are connected in parallel. The difference is not big, and within the deviation range, one transformer can support the output of two voltages of 10kV and 6.6kV at the same time, so that it can work in both power grids without having to make two transformers, which saves resources.

Description of drawings

Fig. 1 is the internal wiring schematic diagram of the present utility model;

Fig. 2 is the wiring diagram of the utility model output voltage at 10kV;

Fig. 3 is the wiring diagram of the output voltage of the utility model at 6.6kV.

In the figure: 1-coil; 11-first coil; 111-A1 interface; 112-A2 interface; 12-second coil; 121-B1 interface; 122-B2 interface; 13-third coil; 131-C1 interface; 132-C2 interface; 2-transfer switch; 21-first gear switch; 22-second gear switch; 23-third gear switch; 24-fourth gear switch; 25-grounding switch; 3-wiring column; 4-high voltage output line.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Please refer to Figures 1-3. In the embodiment of the present utility model, a power transformer for converting and outputting 10kV and 6.6kV voltages includes a coil 1 and a transfer switch 2. The transfer switch 2 consists of a first gear switch 21, a second The gear switch 22, the third gear switch 23, the fourth gear switch 24 and the grounding switch 25 are composed. The grounding switch 25 is used for square leakage treatment and has the function of protection. The first gear switch 21 and the second gear switch 22. The third gear switch 23, the fourth gear switch 24 and the grounding switch 25 are connected to the high-voltage output line 4. The maximum output capacity of the high-voltage output line 4 is 3150KVA, so the 6.6kV and 10kV voltage conversion output is suitable for A power transformer with a capacity of 3150KVA and below, and the first gear switch 21, the second gear switch 22, the third gear switch 23 and the fourth gear switch 24 are electrically connected through the terminal 3, and the terminal The position of 3 can be moved. When the terminal 3 is electrically connected between the second gear switch 22 and the third gear switch 23, the remaining gear switches are all disconnected, so that the first coil 11, the second coil 12 and the third gear switch 23 are all disconnected. The three coils of the third coil 13 are connected in series, which is 3.2+(3.4+3.4)=10kV, and the output voltage of the high-voltage output line 4 is 10kV; When between the gear switch 24, the third gear switch 23 and the first gear switch 21, the remaining gear switches are disconnected, so that the second coil 12 is connected in parallel with the third coil 13 and then connected in series with the first coil 11, that is is 3.2+(3.4//3.4)=6.6kV, the output voltage of the high-voltage output line 4 is 6.6kV, so that the voltage output of the power transformer can be converted between 6.6kV and 10kV, and this structure is adopted to ensure that the low voltage is output In the case of two voltages, the connection group of the transformer remains unchanged, and half of the operating current flows through the second coil 12 and the third coil 13 when they are connected in parallel, no circulating current is generated, and the difference between the transformer's empty load is not large, and they are all in deviation In addition, the transformer impedance is not much different. Within the deviation range, one transformer can support output voltages of 10kV and 6.6kV at the same time, so that it can work in both power grids without having to make two transformers, saving resources ; The coil 1 is divided into a first coil 11, a second coil 12 and a third coil 13, the ratio of turns of the first coil 11, the second coil 12 and the third coil 13 is 3.2:3.4:3.4, and the winding method They are all conventional cylindrical coils, the first coil 11, the second coil 12 and the third coil 13 are axially distributed on the transformer housing, and the voltage conversion is realized through a series-parallel switch, and the first coil 11 is a common coil, which Distributed inside the transformer housing, the second coil 12 and the third coil 13 are distributed outside the transformer housing; the wiring ports of the first coil 11 are also provided with A1 interface 111 and A2 interface 112 respectively, and the wiring of the second coil 12 The ports are respectively provided with a B1 interface 121 and a B2 interface 122, and the third coil The wiring ports of 13 are respectively provided with C1 interface 131 and C2 interface 132; A2 interface 112 and B1 interface 121 are connected in parallel on the first gear switch 21 through wires, and the output end of B2 interface 122 is connected in series with the second gear switch 22 through wires Above; the C1 interface 131 on the third coil 13 is connected in series with the third gear switch 23 through wires, and its C2 interface 132 is connected in series with the fourth gear switch 24 through wires.

To sum up: the 10kV and 6.6kV voltage conversion output power transformer, through the series and parallel structure of the low-voltage coil, the output voltage can be switched between 10kV and 6.6kV. When the output voltage of the transformer is 10kV When the terminal 3 is electrically connected between the second gear switch 22 and the third gear switch 23, the remaining gear switches are all disconnected, so that the first coil 11, the second coil 12 and the third coil 13 are three The coils are connected in series, that is, 3.2+(3.4+3.4)=10kV, and the output voltage of the high-voltage output line 4 is 10kV; when the output voltage of the transformer is 6.6kV, the terminals 3 are respectively electrically connected to the second gear switch 22 When between the fourth gear switch 24, the third gear switch 23 and the first gear switch 21, the remaining gear switches are disconnected, so that the second coil 12 is connected in parallel with the third coil 13 and then connected with the first coil 11 In series, it is 3.2+(3.4//3.4)=6.6kV, the output voltage of the high-voltage output line 4 is 6.6kV, so as to achieve the voltage output of the power transformer to convert between 6.6kV and 10kV, adopting such a structure, ensuring In the case of low-voltage output of two voltages, the transformer connection group remains unchanged, and when the second coil 12 and the third coil 13 each flow half of the operating current in parallel, no circulating current is generated, and the transformer has little difference in empty load. They are all within the deviation range. In addition, the transformer impedance is not much different. Within the deviation range, one transformer can support output voltages of 10kV and 6.6kV at the same time, so that it can work in both power grids without having to make two transformers. Resources are saved.

It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from all points of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, so it is intended to fall within the scope of the claims All changes within the meaning and range of equivalents of the required elements are included in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (5)

1. the power transformer that a kind of 10kV and 6.6kV voltage conversions are exported, including coil (1) and permutator (2), its feature It is：The permutator (2) by the first driving switch (21), the second driving switch (22), third gear switch (23), the 4th Driving switch (24) and earthed switch (25) are constituted, the first driving switch (21), the second driving switch (22), third gear switch (23), fourth speed bit switch (24) and earthed switch (25) circuit are connected with high-voltage output line (4), and the first driving switch (21), carried out by binding post (3) between the second driving switch (22), third gear switch (23) and fourth speed bit switch (24) It is electrically connected with；The coil (1) is divided into first coil (11), the second coil (12) and tertiary coil (13), first coil (11), Second coil (12) and tertiary coil (13) are axially distributed on transformer shell, and first coil (11) is common winding, its The inside of transformer shell is distributed in, the second coil (12) and tertiary coil (13) are distributed in the outside of transformer shell；It is described The Wiring port of first coil (11) is also respectively provided with A1 interfaces (111) and A2 interfaces (112), the wiring of the second coil (12) Port is respectively arranged with B1 interfaces (121) and B2 interfaces (122), and the Wiring port of tertiary coil (13) is respectively arranged with C1 interfaces And C2 interfaces (132) (131)；The A2 interfaces (112) are with B1 interfaces (121) by conductor in parallel in the first driving switch (21) On, the outfan of B2 interfaces (122) is by wired in series on the second driving switch (22)；C1 on the tertiary coil (13) By wired in series in third gear switch (23), its C2 interface (132) is by wired in series in fourth speed position for interface (131) On switch (24).

2. the power transformer that a kind of 10kV and 6.6kV voltage conversions according to claim 1 are exported, it is characterised in that： The maximum capacity of high-voltage output line (4) output is 3150KVA.

3. the power transformer that a kind of 10kV and 6.6kV voltage conversions according to claim 1 are exported, it is characterised in that： The first coil (11), the second coil (12) and the corresponding number of turn ratio of tertiary coil (13) are 3.2: 3.4: 3.4, and coiling Mode is conventional cylindrical layer winding.

4. the power transformer that a kind of 10kV and 6.6kV voltage conversions according to claim 1 are exported, it is characterised in that： When the binding post (3) is electrically connected between the second driving switch (22) and third gear switch (23), high-voltage output line (4) Output voltage be 10kV.

5. the power transformer that a kind of 10kV and 6.6kV voltage conversions according to claim 1 are exported, it is characterised in that： The binding post (3) is electrically connected with the second driving switch (22) and fourth speed bit switch (24), third gear switch (23) when and the first driving switch (21) between, the output voltage of high-voltage output line (4) is 6.6kV.