Series-in type arc sensor

Abstract

The utility model relates to the related technical field of arc sensors, in particular to a series-in type arc sensor, which comprises a magnetic core material, and a hollow induction coil is mounted on the outer side surface of the magnetic core material. According to the series-in type arc sensor, through the arrangement of the magnetic core material, the hollow induction coil and the high-precision hollow spiral resistor, when the arc energy needs to be measured, the fact energy of the arc can be calculated by measuring the current flowing through the high-precision hollow spiral resistor; the current can be obtained by measuring the voltage at the two ends of the high-precision hollow spiral resistor and dividing the voltage by the resistance value, in addition, the number of turns of the high-precision hollow spiral resistor is also the amplification factor of the arc signal, the larger the diameter of the magnetic core material is, the larger the number of turns wound with the same wire diameter is, and the larger the inductance value is. Therefore, the inductance value of the sensor can be changed by changing the number of turns of the magnetic core material and the hollow induction coil, and the change of the inductance value can be reflected in the change of a frequency response curve of the sensor to finally change a measurement frequency band.

Description

Technical Field

[0001] The utility model relates to the technical field related to arc sensors, and in particular to a series-connected arc sensor. Background Art

[0002] The traditional arc fault sensor is a ring-shaped arc sensor based on electric field measurement. The sensor is installed between the load and the line prone to arcing. The collected power frequency and arc electric field signals are directly measured based on the principle of non-contact near-field induction. In order to enhance the sensor's measurement range, a series-type arc sensor is particularly needed.

[0003] However, most of the existing traditional sensors are based on the principle of electromagnetic induction and are easily affected by interference from the surrounding environment. In addition, according to the arc judgment standard, in addition to detecting the arc signal, it is also necessary to detect the arc energy. Therefore, arc sensors often need to be used in conjunction with current sensors, resulting in high product costs and complex installation. Utility Model Content

[0004] The purpose of the present utility model is to provide a series-type arc sensor to solve the problem proposed in the above background technology that most existing traditional sensors based on the principle of electromagnetic induction are easily affected by the interference of the surrounding environment, and according to the arc judgment standard, in addition to detecting the arc signal, it is also necessary to detect the arc energy. Therefore, the arc sensor often needs to be used in conjunction with a current sensor, resulting in high product cost and complex installation.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: a series-type arc sensor, comprising a magnetic core material, a hollow induction coil mounted on the outer surface of the magnetic core material, and a high-precision hollow spiral resistor mounted on the outer surface of the hollow induction coil.

[0006] Preferably, the core material may be, but not limited to, alloy materials such as Sendust, Manganese Zinc, and Nickel Zinc, and the structure of the core material may be, but not limited to, an I-shape, a columnar shape, or a U-shape.

[0007] Preferably, the number of turns of the hollow induction coil can be adjusted, and the hollow induction coil is wrapped around the magnetic core material in the form of a spiral coil.

[0008] Preferably, the outer wall size of the magnetic core material matches the inner wall size of the hollow induction coil, and the magnetic core material and the hollow induction coil form a closed structure.

[0009] Preferably, the magnetic core material can change the inductance of the sensor, and the number of air-core induction coils can change the inductance of the sensor.

[0010] Preferably, the outer wall size of the hollow induction coil matches the inner wall size of the high-precision hollow spiral resistor, and the hollow induction coil and the high-precision hollow spiral resistor form a snap-fit ​​structure.

[0011] Preferably, the material of the high-precision hollow spiral resistor may be, but is not limited to, alloy materials such as manganese-copper alloy, and the high-precision hollow spiral resistor is wrapped around the hollow induction coil in the form of a hollow spiral coil.

[0012] Preferably, the high-precision hollow spiral resistor does not require an external current sensor, and the outer side of the hollow induction coil is wrapped with insulating material.

[0013] Preferably, both ends of the high-precision hollow spiral resistor can be connected in series with the load circuit, and the high-precision hollow spiral resistor can be nested in the sensor.

[0014] Preferably, the outer layer of the high-precision hollow spiral resistor can achieve electromagnetic shielding, and the high-precision hollow spiral resistor can measure arc energy.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the series-type arc sensor, through the arrangement of magnetic core material, hollow induction coil and high-precision hollow spiral resistor, can calculate the actual energy of the arc by measuring the current flowing through the high-precision hollow spiral resistor when the arc energy needs to be measured, and the current can be obtained by measuring the voltage across the high-precision hollow spiral resistor and dividing it by the resistance value. In addition, the number of turns of the high-precision hollow spiral resistor is also the amplification factor of the arc signal, and the larger the diameter of the magnetic core material, the more turns the same wire diameter will have, and the greater the inductance will be. When other parameters remain unchanged, As the diameter of the core material increases, the inductance value decreases, the DCR increases, and the DC superposition capability increases. The reason is that the copper wire blocks the magnetic flux, making the magnetic circuit longer and the total magnetic resistance larger. L = N^ / R, R increases and L decreases. If the wire diameter and number of turns remain unchanged and the center column of the core material is increased, according to the inductance calculation formula L = 4*π*μi*Ae / Le, the cross-sectional area increases, the inductance will increase, the current resistance will increase, and the internal resistance will also increase. Therefore, the inductance of the sensor can be changed by changing the core material and the number of turns of the hollow induction coil. The change in inductance will be reflected in the change of the sensor frequency response curve and ultimately change the measurement frequency band. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall appearance structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the resistor current sampling circuit structure of the utility model.

[0018] In the figure: 1. Magnetic core material; 2. Hollow induction coil; 3. High-precision hollow spiral resistor. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-2 The utility model provides a technical solution: a series-type arc sensor, comprising a magnetic core material 1, a hollow induction coil 2 is installed on the outer surface of the magnetic core material 1, and a high-precision hollow spiral resistor 3 is installed on the outer surface of the hollow induction coil 2. Through the arrangement of the magnetic core material 1, the hollow induction coil 2 and the high-precision hollow spiral resistor 3, when it is necessary to measure the arc energy, the actual energy of the arc can be calculated by measuring the current flowing through the high-precision hollow spiral resistor 3, and the current can be obtained by measuring the voltage across the high-precision hollow spiral resistor 3 and dividing it by the resistance value. In addition, the number of turns of the high-precision hollow spiral resistor 3 is also the amplification factor of the arc signal, and the larger the diameter of the magnetic core material 1, the more the same wire diameter is wound. The more turns there are, the greater the inductance will be. When other parameters remain unchanged, the diameter of the core material 1 increases, the inductance value decreases, the DCR increases, and the DC superposition capability increases. The reason is that the copper wire blocks the magnetic flux, making the magnetic circuit longer and the total magnetic resistance larger, L=N^2 / R, R increases, and L decreases. If the wire diameter and number of turns remain unchanged, and the center column of the core material 1 is increased, according to the inductance calculation formula L=4*π*μi*Ae / Le, the cross-sectional area increases, the inductance will increase, the current resistance will increase, and the internal resistance will also increase. Therefore, by changing the core material 1 and the number of turns of the hollow induction coil 2, the inductance of the sensor can be changed, and the change in inductance will be reflected in the change of the sensor frequency response curve, and ultimately change the measurement frequency band.

[0021] Furthermore, the core material 1 may be made of, but not limited to, alloy materials such as sendust, manganese zinc, nickel zinc, etc., and the structure of the core material 1 may be, but not limited to, I-shaped, columnar, or U-shaped. By setting the core material 1, its cost can be reduced.

[0022] Furthermore, the number of turns of the hollow induction coil 2 can be adjusted. The hollow induction coil 2 is wrapped around the magnetic core material 1 in the form of a spiral coil. Through the setting of the hollow induction coil 2, the inductance of the sensor can be more conveniently changed by adjusting the number of turns.

[0023] Furthermore, the outer wall size of the magnetic core material 1 matches the inner wall size of the hollow induction coil 2 , and the magnetic core material 1 and the hollow induction coil 2 form a snap-fit ​​structure. By setting the magnetic core material 1 , the hollow induction coil 2 can be better installed.

[0024] Furthermore, the magnetic core material 1 can change the inductance of the sensor, and the number of hollow induction coils 2 can change the inductance of the sensor. By setting the magnetic core material 1, the actual energy of the arc can be calculated more comprehensively.

[0025] Furthermore, the outer wall size of the hollow induction coil 2 matches the inner wall size of the high-precision hollow spiral resistor 3, and the hollow induction coil 2 and the high-precision hollow spiral resistor 3 form a snap-fit ​​structure. Through the setting of the hollow induction coil 2, the high-precision hollow spiral resistor 3 can be better installed.

[0026] Furthermore, the material of the high-precision hollow spiral resistor 3 can be but is not limited to alloy materials such as manganese-copper alloy. The high-precision hollow spiral resistor 3 is wrapped around the hollow induction coil 2 in the form of a hollow spiral coil. Through the setting of the high-precision hollow spiral resistor 3, the accuracy of measuring arc energy can be higher.

[0027] Furthermore, the high-precision hollow spiral resistor 3 does not require an external current sensor, and the outer side of the hollow induction coil 2 is wrapped with insulating material. Through the setting of the hollow induction coil 2, it can be less susceptible to interference from external environmental factors.

[0028] Furthermore, the two ends of the high-precision hollow spiral resistor 3 can be connected in series with the load line, and the high-precision hollow spiral resistor 3 can be nested in the sensor. Through the setting of the high-precision hollow spiral resistor 3, the arc signal and arc energy can be collected simultaneously by nesting the high-precision hollow spiral resistor 3 and the sensor.

[0029] Furthermore, the outer layer of the high-precision hollow spiral resistor 3 can achieve electromagnetic shielding, and the high-precision hollow spiral resistor 3 can measure arc energy. Through the setting of the high-precision hollow spiral resistor 3, external environmental interference can be better shielded.

[0030] Working principle: When it is necessary to measure the arc energy, the actual energy of the arc can be calculated by measuring the current flowing through the high-precision hollow spiral resistor 3. The current can be obtained by measuring the voltage across the high-precision hollow spiral resistor 3 and dividing it by the resistance value. In addition, the number of turns of the high-precision hollow spiral resistor 3 is also the amplification factor of the arc signal. The larger the diameter of the core material 1, the more turns the same wire diameter will have, and the greater the inductance will be. When other parameters remain unchanged, the diameter of the core material 1 increases, the inductance value decreases, the DCR increases, and the DC superposition capability increases. It gets bigger because the copper wire blocks the magnetic flux, making the magnetic circuit longer and the total magnetic resistance larger, L=N^2 / R, R gets larger and L gets smaller. If the wire diameter and number of turns remain unchanged and the center column of the core material 1 is increased, according to the inductance calculation formula L=4*π*μi*Ae / Le, the cross-sectional area increases, the inductance will increase, the current resistance will increase, and the internal resistance will also increase. Therefore, by changing the core material 1 and the number of turns of the hollow induction coil 2, the inductance of the sensor can be changed, and the change in inductance will be reflected in the change of the sensor's frequency response curve, and ultimately change the measurement frequency band.

[0031] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A series arc sensor, comprising a magnetic core material (1), characterized in that: A hollow induction coil (2) is installed on the outer surface of the magnetic core material (1), and a high-precision hollow spiral resistor (3) is installed on the outer surface of the hollow induction coil (2).

2. The series-connected arc sensor according to claim 1, characterized in that: The magnetic core material (1) may be, but is not limited to, sendust, manganese zinc, or nickel zinc alloy materials, and the structure of the magnetic core material (1) may be, but is not limited to, an I-shape, a columnar shape, or a U-shape.

3. The series-connected arc sensor according to claim 1, characterized in that: The number of turns of the hollow induction coil (2) can be adjusted, and the hollow induction coil (2) is wrapped around the magnetic core material (1) in the form of a spiral coil.

4. The series-connected arc sensor according to claim 1, characterized in that: The outer wall size of the magnetic core material (1) matches the inner wall size of the hollow induction coil (2), and the magnetic core material (1) and the hollow induction coil (2) form a snap-fit ​​structure.

5. The series-connected arc sensor according to claim 1, characterized in that: The magnetic core material (1) can change the inductance of the sensor, and the number of the air-core induction coils (2) can change the inductance of the sensor.

6. The series-connected arc sensor according to claim 1, characterized in that: The outer wall size of the hollow induction coil (2) matches the inner wall size of the high-precision hollow spiral resistor (3), and the hollow induction coil (2) and the high-precision hollow spiral resistor (3) form a snap-fit ​​structure.

7. The series-connected arc sensor according to claim 1, characterized in that: The material of the high-precision hollow spiral resistor (3) can be, but is not limited to, manganese-copper alloy material. The high-precision hollow spiral resistor (3) is wrapped around the hollow induction coil (2) in the form of a hollow spiral coil.

8. The series-connected arc sensor according to claim 1, characterized in that: The high-precision hollow spiral resistor (3) does not require an external current sensor, and the outer side of the hollow induction coil (2) is wrapped with insulating material.

9. The series-connected arc sensor according to claim 1, characterized in that: The two ends of the high-precision hollow spiral resistor (3) can be connected in series with a load circuit, and the high-precision hollow spiral resistor (3) can be nested in a sensor.

10. The series-connected arc sensor according to claim 1, characterized in that: The outer layer of the high-precision hollow spiral resistor (3) can realize electromagnetic shielding, and the high-precision hollow spiral resistor (3) can measure arc energy.

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