CN113933558A - Instrument capable of automatically identifying specification of current transformer and setting transformation ratio - Google Patents
Instrument capable of automatically identifying specification of current transformer and setting transformation ratio Download PDFInfo
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- CN113933558A CN113933558A CN202111191131.9A CN202111191131A CN113933558A CN 113933558 A CN113933558 A CN 113933558A CN 202111191131 A CN202111191131 A CN 202111191131A CN 113933558 A CN113933558 A CN 113933558A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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Abstract
The invention relates to an instrument capable of automatically identifying the specification of a current transformer and setting a transformation ratio, which comprises an instrument body, a connecting wire and N current transformers with the same specification; the instrument body is provided with a current transformer interface which is a (2N +2) core interface, wherein 2 cores are resistance identification ends; the first end wiring end of the connecting wire is a wiring end corresponding to a core wire of the current transformer interface, the connecting wire is connected with the current transformer interface through the first end wiring end, and the second end wiring end of the connecting wire is divided into N wiring ends which are in one-to-one correspondence with the current transformers; a circuit board is arranged in each current transformer, an interface on the circuit board is connected with a corresponding terminal in the second end terminal, a resistor position for installing resistors is arranged on the circuit board, and resistors with different resistance values are arranged on the circuit boards of the current transformers with different specifications; the resistance value of the resistor of one current transformer is identified through the 2-core resistor identification end, and the transformation ratio is automatically set according to the identified resistance value of the resistor.
Description
Technical Field
The invention relates to an instrument, in particular to an instrument capable of automatically identifying the specification of a current transformer and setting a transformation ratio.
Background
When the instrument measures large current, a current transformer needs to be externally connected, the current transformers with different specifications have different transformation ratios, the instrument needs to set different transformation ratios when being configured with the current transformers with different specifications, manual setting is needed during production, the production efficiency is influenced, and setting errors caused by human negligence easily occur; when the instrument is installed and needs to change current transformer specification at the scene, the instrument transformation ratio needs to reset, needs the manual setting of professional, and need use external equipment to go to set up many times, and the step is loaded down with trivial details.
Disclosure of Invention
Aiming at the problems and the defects in the prior art, the invention provides the instrument which can automatically identify the specification of the current transformer and set the transformation ratio.
The invention solves the technical problems through the following technical scheme:
the invention provides an instrument capable of automatically identifying the specification of a current transformer and setting a transformation ratio, which is characterized by comprising an instrument body, a connecting wire and N current transformers, wherein N is a positive integer and is not less than 1, and the specifications of the N current transformers are the same when N is not less than 2;
the instrument body is provided with a current transformer interface which is a (2N +2) core interface, wherein 2 cores are resistance identification ends, each 2 cores in the 2N cores form a 2-core signal end corresponding to the current transformer, a controller is arranged in the instrument body, and the controller is electrically connected with the current transformer interface;
the first end wiring end of the connecting wire is a wiring end which is in one-to-one correspondence with core wires of the current transformer interface, the connecting wire is connected with the current transformer interface through the first end wiring end, the second end wiring end of the connecting wire is divided into N wiring ends which are in one-to-one correspondence with the current transformer, wherein 4 core wires of 1 wiring end are connected with a 2-core resistance recognition end and a 2-core signal end in the first end wiring end, and in addition, 2 core wires of (N-1) wiring ends are respectively connected with other corresponding 2-core signal ends in the first end wiring end;
a circuit board is arranged in each current transformer, interfaces are arranged on the circuit board, 4 core wires of the interface of one current transformer are connected with the terminal ends of the corresponding 2-core resistor identification ends in the second end terminal ends, the 2 core wires of the interfaces of the (N-1) current transformers are respectively connected with the 2 core wires of the other corresponding terminal ends in the second end terminal ends, a resistor position is arranged on the circuit board, resistors are arranged on the resistor position, and resistors with different resistance values are arranged on the circuit boards of the current transformers with different specifications;
the controller is used for identifying the resistance value of the resistor of one current transformer through the 2-core resistor identification end, automatically identifying the specification of the current transformer according to the identified resistance value of the resistor, and automatically setting the transformation ratio of each current transformer based on the identified specification of the current transformer.
Preferably, the number of the current transformers is 3, the current transformer interfaces are 8-core interfaces, wherein 2 cores are resistance identification ends, 2 cores are L1 signal ends, 2 cores are L2 signal ends, and 2 cores are L3 signal ends;
the first end of the connecting wire is an 8-core terminal, the second end of the connecting wire is divided into 3 terminals, wherein 4 core wires of 1 terminal are connected with a 2-core resistance identification end and a 2-core L1 signal end in the 8-core terminal, and 2 core wires of the other 2 terminals are respectively connected with a 2-core L2 signal end and a 2-core L3 signal end in the 8-core terminal;
the 4-core wire of the interface of the first current transformer is connected with the terminal of the corresponding 2-core resistor identification end in the second terminal, and the 2-core wires of the interfaces of the second current transformer and the third current transformer are respectively connected with the 2-core wires of other corresponding terminal in the second terminal.
Preferably, each of the second end terminations is the same termination, and each termination has at least 4 cores.
Preferably, the resistance position on the circuit board of the current transformer can realize different resistance values by connecting a plurality of same resistors in series or in parallel.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows:
the instrument capable of automatically identifying the specification of the current transformer and setting the transformation ratio can identify the specification of the current transformer by identifying the resistance value of the resistor on the circuit board of the current transformer and realize the automatic setting of the transformation ratio, thereby saving the step of manually setting the transformation ratio when configuring the current transformers with different specifications in production, improving the production efficiency, saving the step of resetting the transformation ratio on site when the specification of the current transformer is changed by the instrument on site, ensuring that the instrument has stronger adaptability and improving the market competitiveness.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a meter for automatically identifying the specification of a current transformer and setting the transformation ratio according to the present invention;
FIGS. 2(a) - (b) are schematic diagrams of instrument current transformer interfaces;
FIG. 3 is a schematic view of a connecting line;
fig. 4(a) - (c) schematic diagrams of current transformers.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, the present embodiment provides an instrument capable of automatically identifying specifications of current transformers and setting transformation ratios, which includes an instrument body, a connection line, and N current transformers, where N is a positive integer and N is greater than or equal to 1, and when N is greater than or equal to 2, the N current transformers have the same specifications. In which a meter with 3 current transformers of the same size is shown in figure 1.
As shown in fig. 2, a current transformer interface 1a is provided on the meter body 1, the current transformer interface 1a is a (2N +2) core interface, wherein 2 cores are resistance identification ends, 2 cores in the 2N cores constitute a 2-core signal end corresponding to a current transformer, a controller is provided in the meter body 1, and the controller is electrically connected with the current transformer interface 1 a. As shown in fig. 2(a), the current transformer interface is an 8-core interface, and as shown in fig. 2(b), in the 8-core interface, 2 cores are resistance identification terminals, 2 cores are L1 signal terminals, 2 cores are L2 signal terminals, and 2 cores are L3 signal terminals.
As shown in fig. 3, the first end wiring terminal 2a of the connection line 2 is a wiring terminal corresponding to the core wire of the current transformer interface 1a, the connection line 2 is connected with the current transformer interface 1a through the first end wiring terminal 2a, the second end wiring terminal of the connection line 2 is divided into N wiring terminals corresponding to the current transformer, wherein 4 core wires of 1 wiring terminal are connected with 2 core resistance recognition ends and 2 core signal ends in the first end wiring terminal, and in addition, 2 core wires of (N-1) wiring terminals are respectively connected with other corresponding 2 core signal ends in the first end wiring terminal. Fig. 3 shows that the first terminal 2a of the connection line 2 is an 8-core terminal, and the second terminal of the connection line 2 is divided into 3 terminals, wherein 4 cores of 1 terminal 2b are connected to a 2-core resistance identification terminal and a 2-core L1 signal terminal in the 8-core terminal, and 2 cores of the other 2 terminals 2c and 2d are respectively connected to a 2-core L2 signal terminal and a 2-core L3 signal terminal in the 8-core terminal 2 a.
As shown in fig. 4, a circuit board 3a is provided inside each current transformer 3, an interface 3b is provided on the circuit board 3a, a 4-core wire of an interface of one current transformer is connected with a terminal corresponding to a 2-core resistor identification end in the second terminal, in addition, 2-core wires of interfaces of (N-1) current transformers are respectively connected with 2-core wires of other corresponding terminal in the second terminal, a resistor position 3c is provided on the circuit board 3a, a resistor is installed on the resistor position 3c, and resistors with different resistances are installed on circuit boards of current transformers with different specifications. Specifically, the 4 core wires of the interface 3b of the first current transformer 3 are connected with the terminal 2b of the corresponding 2-core resistor identification end in the second terminal, the 2 core wires of the interface 3b of the second current transformer are respectively connected with the 2 core wires of the terminal 2c in the second terminal, and the 2 core wires of the interface 3b of the third current transformer are respectively connected with the 2 core wires of the terminal 2d in the second terminal.
The controller is used for identifying the resistance value of the resistor of one current transformer through the 2-core resistor identification end, automatically identifying the specification of the current transformer according to the identified resistance value of the resistor, and automatically setting the transformation ratio of each current transformer based on the identified specification of the current transformer.
Each terminal in the second end terminal is the same terminal, each terminal has 4 cores at least, and 3 terminal insides do not need all connections, determine the terminal number according to actual function, but the idle connection.
The resistance position on the circuit board of the current transformer can realize different resistance values by connecting a plurality of same resistors in series or in parallel, thereby reducing the types of resistor materials.
The instrument capable of automatically identifying the specification of the current transformer and setting the transformation ratio can identify the specification of the current transformer by identifying the resistance values on the circuit boards of the current transformers with different specifications and realize automatic setting of the transformation ratio, so that the step of manually setting the transformation ratio when configuring the current transformers with different specifications in production is omitted, the production efficiency is improved, and when the specification of the current transformer is changed by the instrument on site, the step of resetting the transformation ratio on site is omitted, so that the instrument has stronger adaptability and market competitiveness.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (4)
1. An instrument capable of automatically identifying specifications of current transformers and setting transformation ratios is characterized by comprising an instrument body, a connecting wire and N current transformers, wherein N is a positive integer and is not less than 1, and the specifications of the N current transformers are the same when N is not less than 2;
the instrument body is provided with a current transformer interface which is a (2N +2) core interface, wherein 2 cores are resistance identification ends, each 2 cores in the 2N cores form a 2-core signal end corresponding to the current transformer, a controller is arranged in the instrument body, and the controller is electrically connected with the current transformer interface;
the first end wiring end of the connecting wire is a wiring end which is in one-to-one correspondence with core wires of the current transformer interface, the connecting wire is connected with the current transformer interface through the first end wiring end, the second end wiring end of the connecting wire is divided into N wiring ends which are in one-to-one correspondence with the current transformer, wherein 4 core wires of 1 wiring end are connected with a 2-core resistance recognition end and a 2-core signal end in the first end wiring end, and in addition, 2 core wires of (N-1) wiring ends are respectively connected with other corresponding 2-core signal ends in the first end wiring end;
a circuit board is arranged in each current transformer, interfaces are arranged on the circuit board, 4 core wires of the interface of one current transformer are connected with the terminal ends of the corresponding 2-core resistor identification ends in the second end terminal ends, the 2 core wires of the interfaces of the (N-1) current transformers are respectively connected with the 2 core wires of the other corresponding terminal ends in the second end terminal ends, a resistor position is arranged on the circuit board, resistors are arranged on the resistor position, and resistors with different resistance values are arranged on the circuit boards of the current transformers with different specifications;
the controller is used for identifying the resistance value of the resistor of one current transformer through the 2-core resistor identification end, automatically identifying the specification of the current transformer according to the identified resistance value of the resistor, and automatically setting the transformation ratio of each current transformer based on the identified specification of the current transformer.
2. The instrument capable of automatically identifying the specification of the current transformer and setting the transformation ratio as claimed in claim 1, wherein the number of the current transformers is 3, the current transformer interface is an 8-core interface, 2 cores are resistance identification terminals, 2 cores are L1 signal terminals, 2 cores are L2 signal terminals, and 2 cores are L3 signal terminals;
the first end of the connecting wire is an 8-core terminal, the second end of the connecting wire is divided into 3 terminals, wherein 4 core wires of 1 terminal are connected with a 2-core resistance identification end and a 2-core L1 signal end in the 8-core terminal, and 2 core wires of the other 2 terminals are respectively connected with a 2-core L2 signal end and a 2-core L3 signal end in the 8-core terminal;
the 4-core wire of the interface of the first current transformer is connected with the terminal of the corresponding 2-core resistor identification end in the second terminal, and the 2-core wires of the interfaces of the second current transformer and the third current transformer are respectively connected with the 2-core wires of other corresponding terminal in the second terminal.
3. The instrument for automatically identifying the size and setting the transformation ratio of a current transformer of claim 1, wherein each of said second terminal terminations is the same terminal termination and each terminal termination has at least 4 cores.
4. The instrument for automatically identifying the specification of the current transformer and setting the transformation ratio as claimed in claim 1, wherein the resistance bits on the circuit board of the current transformer can realize different resistance values by connecting a plurality of same resistors in series or in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111191131.9A CN113933558A (en) | 2021-10-13 | 2021-10-13 | Instrument capable of automatically identifying specification of current transformer and setting transformation ratio |
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| CN202111191131.9A CN113933558A (en) | 2021-10-13 | 2021-10-13 | Instrument capable of automatically identifying specification of current transformer and setting transformation ratio |
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| CN202111191131.9A Pending CN113933558A (en) | 2021-10-13 | 2021-10-13 | Instrument capable of automatically identifying specification of current transformer and setting transformation ratio |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116338557A (en) * | 2023-05-29 | 2023-06-27 | 青岛鼎信通讯股份有限公司 | Device and method for automatically identifying measuring range and phase of transformer of field calibrator |
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Cited By (1)
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| CN116338557A (en) * | 2023-05-29 | 2023-06-27 | 青岛鼎信通讯股份有限公司 | Device and method for automatically identifying measuring range and phase of transformer of field calibrator |
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Application publication date: 20220114 |
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