Composite current detection sensor

Abstract

The utility model discloses a composite current detection sensor, which comprises a shunt, the shunt obtains flowing current through voltage at two ends, the shunt and a conductor form a loop, a zero sequence coil is installed on the loop, the zero sequence coil measures the magnitude of residual current of the loop, and the residual current is measured through an electric leakage detection module. The simulation electric leakage module detects the electric leakage state of the zero sequence coil and the electric leakage detection module; the temperature compensation device is mounted on the detection shunt; the wire is used for measuring voltage at two ends of the shunt and transmitting the voltage to the current measurement module. The alternating current and direct current measuring device can measure alternating current and direct current, has a small size, and can be used in industrial facilities with smaller sizes.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to a composite current detection sensor. Background Technology

[0002] Residual current sensors and current sensors are both protective devices used in industrial facilities, specifically for leakage current protection and current measurement and overcurrent protection, respectively. Currently, various technical solutions require two magnetic rings to measure the residual current and rated current separately, such as the CN217282195U patent. This solution, using two stacked rings, increases the sensor size. Furthermore, since DC current exists in industrial facilities, this solution, due to the use of a current transformer, can only measure AC current and lacks DC measurement capabilities. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this application proposes a composite current detection sensor to solve the problems existing in the prior art.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0005] A composite current detection sensor includes a shunt, which obtains the current flowing through it through the voltage at both ends and forms a loop with a conductor. A zero-sequence coil is installed on the loop and measures the magnitude of the residual current in the loop. The measurement is also performed by a leakage current detection module, simulating the leakage current state of the zero-sequence coil and the leakage current detection module. A temperature compensation device is installed on the detection shunt. A wire is used to measure the voltage across the shunt and transmit it to the current measurement module.

[0006] As a further technical solution of this utility model: the shunt is made of a combination of metal or alloy materials.

[0007] As a further technical solution of this utility model: the simulated leakage current module is generated by an externally applied current or by the detection module itself.

[0008] As a further technical solution of this utility model: the output signal of the leakage current detection module is a digital signal, an analog signal, a communication signal, or a combination of all three.

[0009] As a further technical solution of this utility model: the output signal of the current measurement module is a digital quantity, an analog quantity, a communication signal, or a combination of all three.

[0010] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0011] This utility model adopts the above solution.

[0012] 1. It can measure AC and DC current;

[0013] 2. It has a small size, making it suitable for use in smaller industrial facilities. Attached Figure Description

[0014] Figure 1 This is the circuit diagram for single-phase voltage detection in this utility model.

[0015] Figure 2 This is the circuit diagram for three-phase AC voltage detection of this utility model.

[0016] 1-Shunter, 2-Conductor, 3-Zero-sequence coil, 4-Analog leakage current module, 5-Temperature compensation device, 6-Wire, 7-Leakage current detection module, 8-Current measurement module. Detailed Implementation

[0017] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] Example 1, as Figure 1-2 As shown, a composite current detection sensor includes a shunt 1, which obtains the current flowing through it through the voltage at both ends and forms a circuit with a conductor 2. A zero-sequence coil 3 is installed on the circuit and measures the magnitude of the residual current in the circuit. The measurement is performed by a leakage current detection module 7, which simulates the leakage current state of the zero-sequence coil 3 and the leakage current detection module 7 by a leakage current module 4. A temperature compensation device 5 is installed on the detection shunt 1. A wire 6 is used to measure the voltage at both ends of the shunt 1 and transmit it to a current measurement module 8.

[0019] In Example 2, based on Example 1, the shunt 1 is equipped with a temperature compensation device 5, which is not required when the shunt operating temperature is not high. The shunt 1 can be replaced with a conductor made of metal materials such as copper, or a combination of metal and shunt (alloy). The simulated leakage current module 4 can be supplied with current externally, generated by the detection module itself, or it can be omitted when self-testing is not required. The leakage current detection module 7 and the current measurement module 8 can be structurally simplified into a single detection module. The output signals of the leakage current detection module 7 and the current measurement module 8 can be digital, analog, or communication signals, or all three. The leakage current detection module 7 and the current measurement module 8 can be separated from the zero-sequence coil 3 into two independent units or housed within a single enclosure. This design can exist in both single-phase and three-phase configurations.

[0020] The working principle is as follows:

[0021] When this invention is applied to industrial facilities, current flows through shunt 1 and conductor 2. Shunt 1 can collect the voltage across its terminals via wire 6 and transmit it to current measurement module 8. Current measurement module 8 analyzes the voltage value and the voltage value of temperature compensation device 5 to obtain the magnitude of the current flowing through the conductor. The output signal enables current measurement and overcurrent protection functions. When current flows through shunt 1 and conductor 2, zero-sequence coil 3 detects the residual current. The leakage current detection module 7 analyzes this and compares it with a threshold value to output a signal, thus achieving leakage current protection. Throughout the process, the simulated leakage current module 4 can detect the entire leakage current system to determine if it has failed.

[0022] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

[0023] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment have been appropriately combined to form other embodiments that are easy for those skilled in the art to understand.

Claims

1. A composite current detection sensor, comprising a shunt (1), characterized in that: The shunt (1) obtains the current flowing through it through the voltage at both ends and forms a loop with the conductor (2). The zero-sequence coil (3) is installed on the loop. The zero-sequence coil (3) measures the magnitude of the residual current in the loop and measures it through the leakage detection module (7). The simulated leakage module (4) detects the leakage state of the zero-sequence coil (3) and the leakage detection module (7). The temperature compensation device (5) is installed on the detection shunt (1). The wire (6) is used to measure the voltage at both ends of the shunt (1) and transmit it to the current measurement module (8).

2. The composite current detection sensor according to claim 1, characterized in that, The shunt (1) is made of a combination of metal or alloy materials.

3. The composite current detection sensor according to claim 1, characterized in that, The simulated leakage current module (4) is generated by an externally applied current or by the detection module itself.

4. A composite current detection sensor according to claim 1, characterized in that, The output signal of the leakage current detection module (7) can be a digital signal, an analog signal, a communication signal, or a combination of all three.

5. A composite current detection sensor according to claim 1, characterized in that, The output signal of the current measurement module (8) can be a digital signal, an analog signal, a communication signal, or a combination of all three.

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