CN218974562U

CN218974562U - Homonymous terminal detection system

Info

Publication number: CN218974562U
Application number: CN202223110035.XU
Authority: CN
Inventors: 王森; 白冠辰; 牛永肖; 樊二珂
Original assignee: Siemens Electrical Drives Ltd
Current assignee: Siemens Electrical Drives Ltd
Priority date: 2022-11-18
Filing date: 2022-11-18
Publication date: 2023-05-05
Anticipated expiration: 2032-11-18

Abstract

The utility model provides a homonymous terminal detection system, which comprises: an alternating current voltage source having a first output terminal adapted to be electrically connected to a first terminal of a secondary side of a current transformer to be inspected and a second output terminal adapted to be electrically connected to a second terminal of the secondary side; the closed-loop conductor is wound on the iron core of the current transformer to be detected; a voltage signal detection unit having a first detection terminal electrically connected to the first terminal and a second detection terminal electrically connected to the second terminal; and the two detection ends of the current signal detection unit are electrically connected in series to the closed loop of the closed loop conductor, or the current signal detection unit is coupled with the closed loop conductor. The homonymous terminal detection system is simple and convenient to operate, efficient and safe.

Description

Homonymous terminal detection system

Technical Field

The utility model relates to the technical field of circuit detection, in particular to a homonymous terminal detection system.

Background

A current transformer (hereinafter referred to as CT) is used as a current detection component on a direct current variable current drive product, current related fault alarm often occurs in factory test of the current transformer, the alarm is released after a new CT is replaced, and the current transformer is determined to be caused by reverse connection of the same-name ends in the CT.

In the conventional detection method, a current is given to a primary side, a detectable signal is induced to a secondary side, and a waveform relationship between the detected signal of the secondary side and the current signal of the primary side is compared. However, considering that the current transformer becomes relatively large, if a detectable signal is to be induced on the secondary side, a large current source is required to give a large current on the primary side, but the large current source is expensive. The existing method for obtaining proper primary side current at low cost is to transform and limit current through series-parallel combination of resistors for the primary side loop and increase the number of turns of the primary side, and amplify signals through series connection of resistors for the secondary side loop. Currently, a simple, fast, accurate and low-cost homonymous end detection system is needed for solving the problem of reverse connection of CT homonymous ends.

Disclosure of Invention

Aiming at the problems in the prior art, the utility model provides a novel homonymous terminal detection system. The homonymous terminal detection system is simple and convenient to operate, efficient, safe and low in cost.

Specifically, the utility model provides a homonymous terminal detection system, which comprises:

the alternating current voltage source is provided with a first output end and a second output end, the first output end is suitable for being electrically connected with a first wiring terminal of a secondary side of the current transformer to be detected, and the second output end is suitable for being electrically connected with a second wiring terminal of the secondary side;

a closed-loop conductor wound on the iron core of the current transformer to be detected;

a voltage signal detection unit having a first detection end electrically connected to the first terminal of the secondary side and a second detection end electrically connected to the second terminal of the secondary side;

and the two detection ends of the current signal detection unit are electrically connected in series to a closed loop of the closed loop conductor, or the current signal detection unit is coupled with the closed loop conductor.

According to an embodiment of the present utility model, in the peer detection system, the ac voltage source is implemented by a signal generator.

According to an embodiment of the present utility model, in the homonymous terminal detection system described above, the ac voltage source outputs a 50HZ sine wave.

According to an embodiment of the present utility model, in the homonymous terminal detection system described above, the amplitude of the sine wave is greater than or equal to 5V.

According to an embodiment of the present utility model, in the above-mentioned peer end detection system, the electrical connections among the ac voltage source, the voltage signal detection unit, the current signal detection unit and the current transformer to be detected are all detachable electrical connections.

According to an embodiment of the present utility model, in the peer detection system, the voltage signal detection unit and the current signal detection unit are waveform detection units, respectively.

According to an embodiment of the present utility model, in the peer detection system, the voltage signal detection unit and the current signal detection unit are respectively phase detection units.

According to an embodiment of the present utility model, in the peer detection system, the voltage signal detection unit and the current signal detection unit are implemented by an oscilloscope.

According to an embodiment of the present utility model, in the peer detection system, the conductor is a wire.

According to an embodiment of the present utility model, in the above homonymous terminal detection system, the closed-loop conductor is formed by winding one conductor around the iron core of the current transformer by one or more turns.

It is to be understood that both the foregoing general description and the following detailed description of the present utility model are exemplary and explanatory and are intended to provide further explanation of the utility model as claimed.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model. In the accompanying drawings:

fig. 1 is a schematic structural diagram of a peer detection system according to the present utility model.

FIG. 2 is a schematic diagram of an embodiment of a peer detection system of the present utility model.

Reference numerals illustrate:

homonymous terminal detection system 1

AC voltage source 10

Closed loop conductor 11

Core middle hole 12

Voltage signal detecting unit 13

Current signal detection unit 14

Signal generator 20

Oscilloscope 21

Voltage probe 211

Current clamp 212

Current transformer 22

Detailed Description

Embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Furthermore, although terms used in the present utility model are selected from publicly known and commonly used terms, some terms mentioned in the present specification may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Furthermore, it is required that the present utility model is understood, not simply by the actual terms used but by the meaning of each term lying within.

The basic principle and preferred embodiments of the present utility model will be discussed in more detail with reference to the accompanying drawings. Referring first to fig. 1, the homonymous terminal detection system 1 of the present utility model mainly includes an alternating voltage source 10, a closed-loop conductor 11, a voltage signal detection unit 13, and a current signal detection unit 14.

In the embodiment shown in fig. 1, the ac voltage source 10 has a first output terminal adapted to be electrically connected to a first terminal of the secondary side of the current transformer 22 to be inspected and a second output terminal adapted to be electrically connected to a second terminal of the secondary side; the closed-loop conductor 11 passes through the core middle hole 12 of the current transformer 22 and the first end and the second end of the closed-loop conductor 11 are respectively positioned at the first end side and the second end side of the core middle hole 12; a first detection end of the voltage signal detection unit 13 is electrically connected to a first terminal of the secondary side and a second detection end of the voltage signal detection unit 13 is electrically connected to a second terminal of the secondary side; the first detection terminal of the current signal detection unit 14 is electrically connected to the first terminal of the closed loop conductor 11 and the second detection terminal of the current signal detection unit 14 is electrically connected to the second terminal of the closed loop conductor 11.

In the embodiment of fig. 1, the two detection terminals of the current signal detection unit 14 are electrically connected in series in the closed loop of the closed loop conductor 11 to detect the current signal of the closed loop conductor 11. In some embodiments, the current signal detection unit 14 (e.g., using a current transformer, etc.) may also detect the current signal of the closed loop conductor 11 in a manner coupled to the closed loop conductor 11.

The ac voltage source 10 is implemented by, for example and without limitation, a signal generator 20. The ac voltage source 10 output may be any ac signal wave, such as a sine wave, square wave, saw tooth wave, etc. The amplitude of the ac signal wave may be determined according to the internal resistance of the transformer, and is preferably greater than or equal to 5V.

Further, for batch testing, the electrical connections between the ac voltage source 10, the voltage signal detection unit 13 and the current signal detection unit 14 and the current transformer 22 to be tested may be configured as detachable electrical connections. Such as, but not limited to, by providing electrical connectors at the connection ends.

Further, the implementation of the voltage signal detection unit 13 and the current signal detection unit 14 is various. In a preferred embodiment, the voltage signal detecting unit 13 and the current signal detecting unit 14 are respectively configured as waveform detecting units, and are simultaneously displayed by a display unit connected with the voltage signal detecting unit 13 and the current signal detecting unit 14, for example, whether the same name ends of the detected current transformers 22 are reversely connected can be judged manually according to the waveform relationship. The voltage signal detection unit 13, the current signal detection unit 14 and the display may be developed separately or implemented by the oscilloscope 21. In another preferred embodiment, the voltage signal detecting unit 13 and the current signal detecting unit 14 are respectively configured as phase detecting units, and it is determined manually or automatically by a machine whether the same-name ends of the detected current transformers 22 are connected reversely according to the phase relationship between the two. In other embodiments, the voltage signal detecting unit 13 and the current signal detecting unit 14 may be configured as an instantaneous voltage value, an instantaneous current value, and the like, respectively, and determine whether the same-name ends of the detected current transformers 22 are connected reversely according to the relationship between the instantaneous voltage value and the current value manually or automatically by a machine. And is not limited thereto.

Preferably, the closed-loop conductor 11 may be formed by winding a conductor around the core of the current transformer one or more times and then electrically connecting the conductor end to end.

Preferably, the closed loop conductor 11 is surrounded (except at the first and second ends) by an insulating layer, such as, but not limited to, a wire.

Turning to fig. 2, fig. 2 illustrates one embodiment of the peer detection system of the present utility model. This embodiment can be used to verify the validity of the peer detection system 1 shown in fig. 1. As shown in fig. 2, the homonymous terminal detection system 1 uses a signal generator 20 as a signal source to connect to the secondary side of a transformer, the primary side winds a closed-loop wire, and a small signal source (for example, 5V) is applied to the secondary side to enable the secondary side to generate milliamp-level current, so that the closed-loop current can be induced on the primary side, and current-voltage waveforms of the primary side and the secondary side can be obtained through an oscilloscope 21, a voltage probe 211 and a current clamp 212, so that whether the homonymous terminal connection is correct or not can be confirmed. The specific description is as follows:

(1) Determining a reference, namely determining the direction reference of a detection loop by using a qualified transformer, wherein the determination needs to be performed: a. the input direction of the secondary side signal source. For example, define the secondary side signal source red clamp current transformer 22 red lead (L1), black clamp black lead (L2) (as in fig. 2); b. the direction of the secondary side voltage probe 211. For example, the direction of the secondary side voltage probe 211 is defined as that the white long stylus (P1) clamps the red lead (L1), and the black stylus (P2) clamps the black lead (L2) (see fig. 2); c. the P3 clamp L3 of the primary side current clamp 212 and the P4 clamp L4 of the current clamp 212 are counter-clockwise in a closed loop (see FIG. 2). When the reference is determined, the phase directions of the primary side signal and the secondary side signal of the qualified transformer are adjusted to be consistent.

(2) And (3) system building: (1) setting the output of the signal or waveform generator as 50Hz sine wave, and adjusting the amplitude according to CT impedance; (2) the waveform generator is connected with the secondary side of the transformer and is also connected with the voltage clamp, and the direction of the waveform generator is regulated with the reference; (3) a closed wire is threaded on the primary side of the transformer, and the current clamp 212 is clamped on the closed wire, and the direction is regulated with the reference; (4) at this time, waveforms of the primary side and the secondary side displayed in the oscilloscope 21 can be seen, and if the waveform phase relationships are identical, it is determined that the same-name terminals are not connected in reverse, and if the waveform phase relationships are not identical, it is determined that the same-name terminals are connected in reverse.

In summary, the utility model provides a homonymous terminal detection system 1 with a brand new structure. Compared with the existing homonymous terminal detection method, the homonymous terminal detection system 1 is simple and convenient to operate, high-efficiency, safe and low in cost.

It will be apparent to those skilled in the art that various modifications and variations can be made to the above-described exemplary embodiments of the present utility model without departing from the spirit and scope of the utility model. Therefore, it is intended that the present utility model cover the modifications and variations of this utility model provided they come within the scope of the appended claims and their equivalents.

Claims

1. A homonymy end detection system comprising:

-an alternating voltage source (10), the alternating voltage source (10) having a first output adapted to be electrically connected to a first terminal of a secondary side of a current transformer (22) to be inspected and a second output adapted to be electrically connected to a second terminal of the secondary side;

a closed-loop conductor (11) wound on the iron core of the current transformer (22) to be detected;

a voltage signal detection unit (13), a first detection end of the voltage signal detection unit (13) being electrically connected to the first terminal of the secondary side and a second detection end of the voltage signal detection unit (13) being electrically connected to the second terminal of the secondary side;

-a current signal detection unit (14), the two detection terminals of the current signal detection unit (14) being electrically connected in series in a closed loop of the closed loop electrical conductor (11) or the current signal detection unit (14) being coupled with the closed loop electrical conductor (11).

2. Homonymous terminal detection system according to claim 1, characterized in that the alternating voltage source (10) is realized by a signal generator (20).

3. The peer detection system according to claim 1, wherein the ac voltage source (10) outputs a 50HZ sine wave.

4. The peer detection system of claim 3, wherein the amplitude of the 50HZ sine wave is greater than or equal to 5V.

5. The homonymous terminal detection system according to claim 1, characterized in that the electrical connections between the alternating voltage source (10), the voltage signal detection unit (13) and the current signal detection unit (14) and the current transformer (22) to be detected are all detachable electrical connections.

6. The homonymous terminal detection system according to claim 1, wherein the voltage signal detection unit (13) and the current signal detection unit (14) are waveform detection units, respectively.

7. The homonymous terminal detection system according to claim 1, wherein the voltage signal detection unit (13) and the current signal detection unit (14) are respectively phase detection units.

8. The peer detection system according to claim 6 or 7, characterized in that the voltage signal detection unit (13) and the current signal detection unit (14) are implemented by an oscilloscope (21).

9. Homonymous terminal detection system according to claim 1, characterized in that the closed-loop electrical conductor (11) is a wire.

10. The homonymous terminal detection system according to claim 1, characterized in that the closed-loop electrical conductor (11) is formed by one or more turns of an electrical conductor wound around the core of the current transformer (22).