Universal frequency shift meter coil induction current measuring device

Abstract

The utility model discloses a general frequency shift meter coil induction current measuring device which comprises a signal generator, a coil, a current clamp, a load resistor and a digital multimeter. The coil is arranged on the test board and is used for generating induced current; the digital multimeter and the load resistor are connected with the coil and are used for receiving and processing induction current signals; the coil comprises a coil framework, the coil framework is provided with a wire groove, a current clamp column and a wire inlet and outlet hole, a wire is wound on the wire groove, two ends of the wire pass through the wire inlet and outlet hole, and the wire is uniformly wound according to a specific direction and a specific number of turns. The device is high in measurement precision, wide in measurement range, convenient in overall use and operation, and high in accuracy.

Description

Technical Field

[0001] The utility model relates to the technical field related to the field of track circuit detection, in particular to a universal frequency shift meter coil induction current measuring device. Background Art

[0002] The frequency shift meter is one of the important devices used to measure parameters such as voltage and current in the power system. During the operation of the power system, in order to ensure the normal operation and safety of the equipment, the frequency shift meter needs to be tested and maintained regularly. Among them, the measurement device of the coil induced current is one of the key links in the frequency shift meter test. The device includes one or more coils for inducing current on the device under test; a signal generator for generating a high-frequency signal and transmitting it through the coil; and a frequency shift meter for receiving the current signal induced by the coil and converting it into a readable current value. However, the traditional current measurement method usually uses a clamp ammeter for manual measurement or directly connects the ammeter for measurement, but these methods have some limitations, such as low measurement accuracy, measurement position changeability affecting measurement accuracy, limited measurement range, and certain interference to the device under test. Therefore, it is of great significance to develop a high-precision and high-efficiency current measurement device. Utility Model Content

[0003] The utility model aims to solve the shortcomings in the prior art and proposes a universal frequency shift meter coil induction current measuring device.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A universal frequency shift meter coil induced current measuring device comprises a signal generator, a coil, a current clamp, a load resistor, and a digital multimeter; the coil is arranged on a test bench to generate an induced current; the digital multimeter and the load resistor are connected to the coil to receive and process the induced current signal;

[0006] The coil comprises a coil frame, on which a wire slot, a current clamping column and a wire access hole are arranged, a wire is wound around the wire slot and both ends of the wire pass through the wire access hole, and the wire is evenly wound in a specific direction and with a specific number of turns.

[0007] Preferably, a plurality of fixing blocks are fixedly arranged around the coil frame, and fixing holes are arranged on the fixing blocks.

[0008] Preferably, the wire slot includes a plurality of slot bodies arranged on the coil frame, the slot bodies include slots arranged on the upper and lower sides and side walls of the coil frame and through holes on the coil frame, and a circular opening connected to the plurality of slot bodies is coaxially arranged on the current clamping column.

[0009] Preferably, the blue wire is inserted into the two holes on the upper side of the wire inlet and outlet hole and is wound through the last slot body on the right side of the wire trough, and the yellow wire is inserted into the two holes on the lower side of the wire inlet and outlet hole and is wound through the other slot bodies of the wire trough.

[0010] Preferably, a frequency shift table is also provided on the test bench.

[0011] Preferably, the coil skeleton is designed to be lightweight.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows: by fixing the current clamp at a specific position to sense the coil current, direct contact with the device under test can be avoided, thereby reducing interference with the device under test; secondly, the method realizes the measurement of multi-level currents, and has good adaptability, flexibility and anti-interference; in addition, the device of the present invention also has the advantages of simple structure, convenient operation, wide range of applications, etc., and can be widely used in different types of frequency shift meter tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 It is a cross-sectional structural schematic diagram of the utility model;

[0015] Figure 3 This is a working principle diagram of the utility model.

[0016] In the figure:

[0017] 1 coil frame, 2 wire slot, 3 current clamp column, 4 wire entry and exit hole, 5 wire, 6 fixing block. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0019] Reference Figure 1-3 The universal frequency shift meter coil induction current measuring device shown comprises:

[0020] Signal generator, coil, current clamp, load resistor, digital multimeter; the coil is set on the test bench to generate induced current, and the test bench is also equipped with a frequency shift meter for recording; the digital multimeter and the load resistor are connected to the coil to receive and process the induced current signal, and the whole is controlled by the control system;

[0021] Specifically, the coil includes a coil skeleton 1, a plurality of fixing blocks 6 are fixedly arranged around the coil skeleton 1, and fixing holes are arranged on the fixing blocks 6 for fixing. At the same time, the coil skeleton 1 is designed to be lightweight and has a hollow structure, etc. The skeleton material adopts a material with good high temperature resistance and high pressure resistance (such as epoxy resin, etc.), which can effectively reduce external electromagnetic interference and further improve the measurement accuracy. The coil skeleton 1 is provided with a wire groove 2, a current clamp column 3 and a wire entry and exit hole 4. A wire 5 is wound around the wire groove 2 and both ends of the wire 5 pass through the wire entry and exit hole 4. The wire 5 is evenly wound in a specific direction and number of turns to achieve a specific magnetic field distribution. After the winding is completed, it is necessary to check and adjust to ensure that the shape, size and quality of the coil meet the requirements.

[0022] Specifically, the wire slot 2 includes a plurality of slot bodies arranged on the coil skeleton 1, the slot bodies include slots arranged on the upper and lower sides and the side walls of the coil skeleton 1 and through holes on the coil skeleton 1, and a circular opening connected to the plurality of slot bodies is coaxially arranged on the current clamping column 3; specifically, the blue wire is inserted into the two holes on the upper side of the wire entry and exit hole 4 and is wound through the last slot body on the right side of the wire slot, and the yellow wire is inserted into the two holes on the lower side of the wire entry and exit hole 4 and is wound through the other slot bodies of the wire slot, which can form a circuit with two gears.

[0023] Working principle: First, the signal generator generates a frequency-adjustable signal. After amplification, the current clamp on the coil device transmits the induced current signal with the same frequency as the high-frequency signal to the device under test through the digital multimeter and the load resistor. Then, the frequency shift meter receives the induced current signal and converts it into a readable current value. Finally, the user can evaluate and analyze the performance of the device under test based on the converted current value.

[0024] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A universal frequency shift meter coil induction current measuring device, characterized in that: It includes a signal generator, a coil, a current clamp, a load resistor, and a digital multimeter; the coil is arranged on a test bench to generate an induced current; the digital multimeter and the load resistor are connected to the coil to receive and process the induced current signal; The coil comprises a coil frame (1), the coil frame (1) is provided with a wire slot (2), a current clamping column (3) and a wire entry and exit hole (4), a wire (5) is wound around the wire slot (2) and both ends of the wire (5) pass through the wire entry and exit hole (4), and the wire (5) is evenly wound in a specific direction and with a specific number of turns.

2. The universal frequency shift meter coil induced current measuring device according to claim 1, characterized in that: A plurality of fixing blocks (6) are fixedly arranged around the coil frame (1), and fixing holes are arranged on the fixing blocks (6).

3. The universal frequency shift meter coil induced current measuring device according to claim 1, characterized in that: The wire slot (2) comprises a plurality of slot bodies arranged on the coil frame (1), the slot bodies comprising slots arranged on the upper and lower sides and the side walls of the coil frame (1) and through holes on the coil frame (1), and a circular opening connected to the plurality of slot bodies is coaxially arranged on the current clamping column (3).

4. The universal frequency shift meter coil induced current measuring device according to claim 3, characterized in that: The blue wire is inserted into the two holes on the upper side of the wire inlet and outlet hole (4) and is wound through the last slot body on the right side of the wire trough, and the yellow wire is inserted into the two holes on the lower side of the wire inlet and outlet hole (4) and is wound through the other slot bodies of the wire trough.

5. The universal frequency shift meter coil induced current measuring device according to claim 1, characterized in that: The test bench is also provided with a frequency shift table.

6. The universal frequency shift meter coil induced current measuring device according to claim 1, characterized in that: The coil frame (1) is designed to be lightweight.

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