Dual-purpose voltage transformer for both measurement and power supply

Abstract

The utility model relates to the technical field of transformers, in particular to a dual-purpose voltage transformer capable of giving consideration to measurement and power supply, which comprises a primary winding connected to a power transmission line and a measurement winding coupled with the primary winding to measure the voltage of the power transmission line, the power supply winding is coupled with the primary winding to output voltage; the power supply winding is an induction coil of which the number of turns is more than twice the number of turns of the measuring winding; the transformer further comprises at least two annular magnetic cores. A soft magnetic sheet for isolating a magnetic field is arranged between the parts, close to each other, of the two magnetic cores; one magnetic core is a measuring magnetic core, and the other magnetic core is a power supply magnetic core; the measuring magnetic core passes through the primary winding and the measuring winding; the power supply magnetic core penetrates through the primary winding and the power supply winding; an isolation plate made of a soft magnetic material and used for isolating the power supply winding from the measuring winding is also arranged; an external magnetic field is shielded through the shell, and the measurement precision of the voltage transformer is improved; measurement and power supply are both considered, installation is convenient, space is saved, and the isolation plate and the soft magnetic row piece are arranged between the measurement winding and the power supply winding to guarantee measurement precision.

Description

Technical Field

[0001] The present application relates to the technical field of transformers, and in particular to a voltage transformer. Background Art

[0002] A voltage transformer is a device used to measure the voltage in an electric power system. It is usually used to reduce the voltage of a high-voltage system to a safe range for measurement. When the circuit is transmitting power, a transformer is also required to reduce the voltage of the high-voltage system to 220V for users.

[0003] However, voltage transformers and transformers are generally large in size. Installing voltage transformers and transformers at the same time in some narrow places is not only inconvenient, but the proximity of the transformer to the voltage transformer can also easily affect the measurement accuracy of the voltage transformer. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the name of the utility model of this application to avoid blurring the purpose of this section, the abstract of the specification and the name of the utility model, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the above problems and / or the problems existing in the prior art, the present utility model is proposed.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] A voltage transformer for both measurement and power supply, comprising a primary winding connected to a transmission line, and a measuring winding coupled to the primary winding for measuring the voltage of the transmission line;

[0008] It also includes a power supply winding coupled with the primary winding to output a voltage, the power supply winding being an induction coil having a number of turns greater than twice the number of turns of the measuring winding;

[0009] Also included are at least two annular magnetic cores;

[0010] At least a portion of the two magnetic cores are close to each other;

[0011] The primary winding is wrapped around the parts of the two magnetic cores that are close to each other;

[0012] A soft magnetic sheet is arranged between the parts of the two magnetic cores that are close to each other to isolate the magnetic field;

[0013] One of the two magnetic cores is the measuring magnetic core, and the other is the supply magnetic core;

[0014] The measuring magnetic core passes through the primary winding and the measuring winding;

[0015] The electromagnetic core passes through the primary winding and the power supply winding;

[0016] An isolation plate made of soft magnetic material is also provided to separate the power supply winding and the measurement winding.

[0017] The above design, by arranging a power supply winding coupled with the primary winding on the primary winding of the voltage transformer, enables the voltage transformer to have a power supply function. The dual-purpose voltage transformer for both measurement and power supply saves equipment installation space, and the voltage transformer and transformer are integrated to save equipment expenses; secondly, a soft magnetic sheet is arranged between the measuring magnetic core and the power supply magnetic core to prevent the magnetic fields of the measuring magnetic core and the power supply magnetic core from affecting each other, thereby improving the measurement accuracy of the dual-purpose voltage transformer for both measurement and power supply; finally, an isolation plate of soft magnetic material is also arranged to separate the power supply winding and the measuring winding, thereby preventing the secondary magnetic fields of the power supply winding and the measuring winding from affecting each other, thereby further improving the measurement accuracy of the dual-purpose voltage transformer for both measurement and power supply.

[0018] Preferably, it also includes a shell, the isolation plate is arranged in the inner cavity of the shell, the two inner cavities separated by the isolation plate, one inner cavity for placing the measuring winding is called the measuring cavity, and the other inner cavity for placing the power supply winding is called the power supply cavity; the thickness of the isolation plate is 2-5mm; the inner cavity of the shell is divided into two parts by the isolation plate, so as to prevent the measuring winding and the power supply winding in the shell from affecting each other, thereby improving the measurement accuracy of the dual-purpose voltage transformer that takes into account both measurement and power supply.

[0019] Preferably, the isolation plate is provided with a notch for installing the primary winding, called an installation opening; the soft magnetic sheet in the primary winding passes through the primary winding and is connected to the isolation plate; the installation of the primary winding is convenient.

[0020] The upper and lower ends of the soft magnetic sheet are against the primary winding, and the thickness of the soft magnetic sheet is 0.5-2mm; the soft magnetic sheet is connected to the isolation plate and is against the inner circle of the primary winding, so that the measuring winding and the power supply winding are separated as much as possible, thereby improving the electromagnetic shielding effect and the measurement accuracy.

[0021] Preferably, the primary winding, measuring winding and power supply winding are all wrapped in oil paper; all windings are wrapped with oil paper to insulate the windings, prevent the primary winding, measuring winding and power supply winding from being electrically broken down, and improve the stability of the device operation.

[0022] Preferably, the inner cavity of the shell is filled with epoxy resin; filling with epoxy resin further improves the insulation of the primary winding, the measuring winding and the power supply winding, and also fixes the internal structure of the shell, so that the dual-purpose voltage transformer for both measurement and power supply has more stable operation and longer service life.

[0023] Preferably, the shell is a shell of stainless steel metal material, and the outside of the shell is sprayed with insulating paint; by setting a stainless steel metal material shell and spraying insulating paint, the stability of the dual-purpose voltage transformer for both measurement and power supply is improved, which facilitates its installation in special harsh environments and improves the stability of the device.

[0024] Preferably, each of the magnetic cores is divided into a part wrapped around the primary winding, called a primary half-core, and a part detachably connected to the primary half-core, called a secondary half-core; the primary half-core and the secondary half-core are both covered with an insulating sleeve made of silicone rubber; by dividing the magnetic core into two detachable parts, the primary magnetic core is wrapped around the primary half-core, and the measuring winding or the power supply winding is wrapped around the secondary half-core, the primary half-core and the secondary half-core are detachably connected, so that the measuring winding and the power supply winding can be conveniently coupled and installed with the primary winding.

[0025] Optimization, the measuring winding and the power supply winding are both connected and provided with fuses; by providing the fuses, the stability of the operation of the dual-purpose voltage transformer for both measurement and power supply is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0027] Figure 1 A schematic diagram of a combined connection structure of a primary winding, a measuring winding and a power supply winding in a dual-purpose voltage transformer for both measurement and power supply according to an embodiment of the utility model;

[0028] Figure 2 A schematic diagram of a structure in which a primary winding, a measuring winding and a power supply winding of a dual-purpose voltage transformer for both measurement and power supply are installed in a housing according to an embodiment of the utility model;

[0029] Figure 3 This is a schematic diagram of the overall appearance structure of a dual-purpose voltage transformer for both measurement and power supply according to an embodiment of the utility model. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present invention more understandable, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0033] Secondly, the "one embodiment" or "embodiment" referred to herein refers to a specific feature, structure or characteristic that can be included in at least one implementation of the utility model. The "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0034] Example 1

[0035] Reference Figure 1 to Figure 3 This embodiment provides a dual-purpose voltage transformer for both measurement and power supply, including a primary winding 1 connected to a transmission line, and a measuring winding 2 coupled to the primary winding 1 to measure the voltage of the transmission line.

[0036] It also includes a power supply winding 3 coupled with the primary winding 1 to output a voltage, the power supply winding 3 is an induction coil with a coil turn number greater than twice the coil turn number of the measuring winding 2; it also includes at least two annular magnetic cores 4; at least a portion of the two magnetic cores 4 are close to each other; the primary winding 1 is wrapped around the portion of the two magnetic cores 4 close to each other; a soft magnetic sheet 5 is arranged between the portions of the two magnetic cores 4 close to each other for isolating the magnetic field; one of the two magnetic cores 4 is a measuring magnetic core 4, and the other is a power supply magnetic core 4; the measuring magnetic core 4 passes through the primary winding 1 and the measuring winding 2; the power supply magnetic core 4 passes through the primary winding 1 and the power supply winding 3; an isolation plate of soft magnetic material is also arranged to separate the power supply winding 3 and the measuring winding 2; by arranging the power supply winding 3 coupled with the primary winding 1 on the primary winding 1 of the voltage transformer, the voltage transformer has a power supply function, and the dual-purpose voltage transformer that takes into account both measurement and power supply saves equipment installation space and reduces the voltage transformer The device and the transformer are integrated into one, which saves equipment expenses; secondly, a soft magnetic sheet 5 is arranged between the measuring magnetic core 4 and the supply magnetic core 4 to prevent the magnetic fields of the measuring magnetic core 4 and the supply magnetic core 4 from affecting each other, thereby improving the measurement accuracy of the dual-purpose voltage transformer that takes into account both measurement and power supply; finally, an isolation plate of soft magnetic material is provided to separate the power supply winding 3 and the measuring winding 2 to prevent the secondary magnetic fields of the power supply winding 3 and the measuring winding 2 from affecting each other, thereby further improving the measurement accuracy of the dual-purpose voltage transformer that takes into account both measurement and power supply. The power supply winding 3 is an induction coil with a coil turn number that is twice the number of coil turns of the measuring winding 2, thereby ensuring that the power supply system has a sufficiently large current to supply the power system, and also maintaining a small current in the measuring winding 2 to prevent the current in the measuring winding 2 from being too large and burning the device, and the coil wire diameter of the power supply winding 3 is also more than twice the coil wire of the measuring winding 2, thereby ensuring that the low resistance of the power supply winding 3 can pass a relatively large current.

[0037] It also includes a shell 7, an isolation plate 6 is arranged in the inner cavity of the shell 7, and two inner cavities separated by the isolation plate 6, one inner cavity for placing the measuring winding 2 is called the measuring cavity 8, and the other inner cavity for placing the power supply winding 3 is called the power supply cavity 9; the thickness of the isolation plate 6 is 2-5mm; the inner cavity of the shell 7 is divided into two parts by the isolation plate 6, so as to prevent the measuring winding 2 and the power supply winding 3 in the shell 7 from affecting each other, thereby improving the measurement accuracy of the dual-purpose voltage transformer that takes into account both measurement and power supply.

[0038] The isolation plate 6 is provided with a notch for installing the primary winding 1 , which is called an installation opening; the soft magnetic sheet 5 in the primary winding 1 passes through the primary winding 1 and is connected to the isolation plate 6 .

[0039] The upper and lower ends of the soft magnetic sheet 5 are against the primary winding 1, and the thickness of the soft magnetic sheet 5 is 0.5-2mm; the soft magnetic sheet 5 is connected to the isolation plate 6 and the soft magnetic sheet 5 is against the inner circle of the primary winding 1, so that the measuring winding 2 and the power supply winding 3 are separated as much as possible, thereby improving the electromagnetic shielding effect and improving the measurement accuracy.

[0040] The primary winding 1, the measuring winding 2 and the power supply winding 3 are all wrapped in oil paper; all windings are wrapped with oil paper to insulate the windings, thereby preventing the primary winding 1, the measuring winding 2 and the power supply winding 3 from being electrically broken down, thereby improving the stability of the device operation.

[0041] The inner cavity of the shell 7 is filled with epoxy resin; the epoxy resin filling further improves the insulation of the primary winding 1, the measuring winding 2 and the power supply winding 3, and also fixes the internal structure of the shell 7, so that the dual-purpose voltage transformer for both measurement and power supply has more stable operation and longer service life.

[0042] The shell 7 is a stainless steel metal shell 7, and the outside of the shell 7 is sprayed with insulating paint; by setting the stainless steel metal shell 7 and spraying the insulating paint, the stability of the dual-purpose voltage transformer for both measurement and power supply is improved, which facilitates its installation in special harsh environments and improves the stability of the device.

[0043] When in use, first wrap the primary winding 1, the measuring winding 2 and the power supply winding 3 in oil paper, then wrap the primary winding 1 and the measuring winding 2 wrapped in oil paper on the measuring magnetic core 4, then wrap the primary winding 1 and the power supply winding 3 on the power supply magnetic core 4, then use the soft magnetic sheet 5 to separate the measuring magnetic core 4 and the power supply magnetic core 4 wrapped by the primary winding 1, then install the isolation plate 6 on the primary winding 1, fix the primary winding 1 in the installation opening, the soft magnetic sheet 5 passes through the primary winding 1 and is connected to the isolation plate 6, the power supply winding 3 and the measuring winding 2 are respectively placed on both sides of the isolation plate 6, then install the above structure in the shell 7, fix the isolation plate 6 in the inner cavity of the shell 7, and supply The electric winding 3 and the measuring winding 2 are placed in the measuring cavity 8 and the power supply cavity 9 respectively, the outer shell 7 is filled with epoxy resin, and then the outer shell 7 is sealed with a metal cover plate, and the installation of the dual-purpose voltage transformer for both measurement and power supply is completed. The primary winding 1 is connected to the transmission line, the measuring winding 2 is connected to the voltage measuring device, and the power supply winding 3 is connected to the power consumption system. The whole device integrates the voltage transformer and the transformer together, which saves installation space and facilitates its installation in a small space. The power supply winding 3 and the measuring winding 2 are electromagnetically shielded to ensure the measurement accuracy of the voltage transformer, so that the device can adapt to various complex environments and is convenient for wiring and installation.

[0044] Example 2

[0045] Reference Figure 1 and Figure 2 , which is the second embodiment of the utility model, and this embodiment is based on the previous embodiment.

[0046] Each magnetic core 4 is divided into a part wrapped around the primary winding 1, called a primary half-core, and a part detachably connected to the primary half-core, called a secondary half-core; both the primary half-core and the secondary half-core are covered with an insulating sleeve of silicone rubber; by dividing the magnetic core 4 into two detachable parts, the primary magnetic core 4 is wrapped around the primary half-core, and the measuring winding 2 or the power supply winding 3 is wrapped around the secondary half-core, and the primary half-core and the secondary half-core are detachably connected, so that the measuring winding 2 and the power supply winding 3 can be conveniently coupled and installed with the primary winding 1.

[0047] The measuring winding 2 and the power supply winding 3 are both connected with fuses; the stability of the operation of the dual-purpose voltage transformer for both measurement and power supply is improved by setting the fuses.

[0048] Both ends of the wires of the primary winding 1, the measuring winding 2 and the power supply winding 3 pass through the epoxy resin and the shell 7 and extend out of the shell 7. Both ends of the wires of the primary winding 1, the measuring winding 2 and the power supply winding 3 are connected with insulated terminal blocks, which facilitates the connection of the dual-purpose voltage transformer for both measurement and power supply to the circuit.

[0049] When in use, when the primary winding 1 is coupled with the measuring winding 2 and the power supply winding 3 for installation, the primary half core and the secondary half core of the measuring magnetic core 4 are first disassembled, the primary half core is wrapped with an upper insulating sleeve, and then the primary half core is passed through the primary winding 1, and then the secondary half core is wrapped with an upper insulating sleeve and passed through the measuring winding 2, and then the primary half core and the secondary half core of the measuring magnetic core 4 are connected together by bolts and nuts. Similarly, the primary half core and the secondary half core of the power supply magnetic core 4 are wrapped with insulating sleeves and then passed on the primary winding 1 and the power supply winding 3; after the above structure is installed in the shell 7, both ends of the wires of the primary winding 1, the measuring winding 2 and the power supply winding 3 are passed through the epoxy resin and the shell 7, extended from the shell 7, and connected to the wiring terminals, and the wiring terminals of the measuring winding 2 and the power supply winding 3 are connected to the fuse, the primary winding 1 is connected to the transmission line, the measuring winding 2 is connected to the voltage measuring device, and the power supply winding 3 is connected to the power consumption system, so as to facilitate its quick installation.

[0050] Importantly, it should be noted that the construction and arrangement of the present application shown in a number of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible, for example, the size, scale, structure, shape and proportion of various elements, and parameter values ​​such as temperature, pressure, etc., mounting arrangements, use of materials, color, directional changes, etc., without substantially departing from the novel angles and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present utility model. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of the execution function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present utility model, other substitutions, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0051] Additionally, in order to provide a concise description of the exemplary embodiments, all features of the actual embodiments may not be described, ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention.

[0052] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, the development effort will be a routine task of design, fabrication, and production without undue experimentation.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A voltage transformer for both measurement and power supply, comprising a primary winding connected to a transmission line, and a measuring winding coupled to the primary winding to measure the voltage of the transmission line, characterized in that: It also includes a power supply winding coupled with the primary winding to output a voltage, the power supply winding being an induction coil having a number of turns greater than twice the number of turns of the measuring winding; Also included are at least two annular magnetic cores; At least a portion of the two magnetic cores are close to each other; The primary winding is wrapped around the parts of the two magnetic cores that are close to each other; A soft magnetic sheet is arranged between the parts of the two magnetic cores that are close to each other to isolate the magnetic field; One of the two magnetic cores is the measuring magnetic core, and the other is the supply magnetic core; The measuring magnetic core passes through the primary winding and the measuring winding; The electromagnetic core passes through the primary winding and the power supply winding; An isolation plate made of soft magnetic material is also provided to separate the power supply winding and the measurement winding.

2. The voltage transformer for both measurement and power supply according to claim 1 is characterized in that: It also includes a shell, the isolation plate is arranged in the inner cavity of the shell, and the two inner cavities separated by the isolation plate, one of which is for placing the measuring winding is called the measuring cavity, and the other is for placing the power supply winding is called the power supply cavity; The thickness of the isolation plate is 2-5 mm.

3. The voltage transformer for both measurement and power supply according to claim 2 is characterized in that: The isolation plate is provided with a notch for installing the primary winding, which is called an installation opening; The soft magnetic sheet in the primary winding passes through the primary winding and is connected to the isolation plate.

4. The voltage transformer for both measurement and power supply according to claim 3 is characterized in that: The upper and lower ends of the soft magnetic sheet are against the primary winding, and the thickness of the soft magnetic sheet is 0.5-2 mm.

5. The voltage transformer for both measurement and power supply according to claim 4 is characterized in that: The primary winding, the measuring winding and the power supply winding are all wrapped in oil paper.

6. The voltage transformer for both measurement and power supply according to claim 2, characterized in that: The inner cavity of the shell is filled with epoxy resin.

7. The voltage transformer for both measurement and power supply according to claim 2, characterized in that: The shell is made of stainless steel metal material, and the outside of the shell is sprayed with insulating paint.

8. The voltage transformer for both measurement and power supply according to claim 1, characterized in that: Each of the magnetic cores is divided into a portion surrounding the primary winding, called a primary half-core, and a portion detachably connected to the primary half-core, called a secondary half-core; The primary half magnetic core and the secondary half magnetic core are both covered with a silicone rubber insulating sleeve.

9. The voltage transformer for both measurement and power supply according to claim 1, characterized in that: The measuring winding and the power supply winding are both connected with fuses.

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