Relay non-contact voltage measuring device and measuring method thereof

Abstract

The invention relates to the technical field of relay voltage measurement, and provides a relay non-contact voltage measuring device and a measuring method thereof. Comprising a power supply module, a non-contact voltage sensor, a differential signal processing module and a controller module, the non-contact voltage sensor is electrically connected with the differential signal processing module; the differential signal processing module is electrically connected with the controller module; the power supply module is electrically connected with the non-contact voltage sensor, the differential signal processing module and the controller module; and the power supply module is used for supplying power to the non-contact voltage sensor, the differential signal processing module and the controller module. The voltage of the relay is measured by using the non-contact voltage module. And the safety of the measurement process is greatly improved. And direct contact with a circuit is avoided, so that the risk of electric shock is eliminated, and the safety of operators is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of relay voltage measurement, and provides a relay non-contact voltage measurement device and a measurement method thereof. Background Art

[0002] As the core component of circuit protection and control, relays have a demand for voltage measurement technology. At present, most power frequency voltage measurement methods rely on contact measurement technology, that is, by directly connecting the electrical probe to the circuit under test, using voltage division, sampling circuit or voltage transformer to detect the voltage.

[0003] Although this contact measurement is effective in some applications, it has many disadvantages in high voltage or special environments. First, contact measurement requires direct contact with the relay circuit, which is not applicable in many occasions that require electrical isolation. In addition, the traditional measurement method has a large power loss during the connection process, and frequent contact operations will cause certain damage to the relay. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention provides a relay non-contact voltage measurement device and a measurement method thereof to achieve non-contact measurement of the relay.

[0005] The present invention provides a relay non-contact voltage measuring device, comprising: a power supply module, a non-contact voltage sensor, a differential signal processing module and a controller module; The non-contact voltage sensor is electrically connected to the differential signal processing module; The differential signal processing module is electrically connected to the controller module; The power supply module is electrically connected to the non-contact voltage sensor, the differential signal processing module and the controller module; The power supply module is used to supply power to the non-contact voltage sensor, the differential signal processing module and the controller module; The non-contact voltage sensor includes a moving contact non-contact voltage sensor and a stationary contact non-contact voltage sensor; The moving contact non-contact voltage sensor is connected to the moving contact circuit of the relay to measure the moving contact voltage; The static contact non-contact voltage sensor is connected to the static contact circuit of the relay to measure the static contact voltage; The differential signal processing module is used to amplify the difference between the moving contact voltage and the static contact voltage; The controller module determines the operating state of the relay according to the amplified relay voltage.

[0006] According to a relay non-contact voltage measurement device provided by the present invention, the non-contact voltage sensor comprises: a wire placement hole, an inductive metal measurement layer, an intermediate isolation dielectric layer and an external metal shielding layer; The inductive metal measuring layer has a wire placement hole; The intermediate isolation medium layer is coated on the outside of the inductive metal measurement layer; The outer metal shielding layer is coated on the outer side of the middle isolation dielectric layer.

[0007] According to a relay non-contact voltage measuring device provided by the present invention, the moving contact circuit is inserted into the wire placement hole of the moving contact non-contact voltage sensor, and the stationary contact circuit is inserted into the wire placement hole of the stationary contact non-contact voltage sensor.

[0008] According to a relay non-contact voltage measurement device provided by the present invention, the differential signal processing module includes: a first amplifier, a second amplifier, a third amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first coupling capacitor, a second coupling capacitor, and a third capacitor. One end of the first coupling capacitor is connected to the moving contact non-contact voltage sensor, and the other end of the first coupling capacitor is connected to one end of the sixth resistor; One end of the second coupling capacitor is connected to the static contact non-contact voltage sensor, and the other end of the second coupling capacitor is connected to the other end of the sixth resistor; One end of the sixth resistor is connected to the positive input end of the first amplifier, and the other end of the sixth resistor is connected to the positive input end of the second amplifier; The output terminal of the first amplifier is connected to the negative input terminal of the first amplifier; The output terminal of the second amplifier is connected to the negative input terminal of the second amplifier; One end of the first resistor is connected to the output end of the first amplifier, and the other end of the first resistor is connected to the negative input end of the third amplifier; One end of the third resistor is connected to the output end of the second amplifier, and the other end of the third resistor is connected to the positive input end of the third amplifier; One end of the second resistor is connected to the other end of the first resistor, and the other end of the second resistor is connected to the output end of the third amplifier; One end of the fourth resistor is connected to the other end of the third resistor, and the other end of the fourth resistor is connected to one end of the third capacitor; One end of the fifth resistor is connected to the output end of the third amplifier, and the other end of the fifth resistor is connected to the other end of the third capacitor; One end of the third capacitor is grounded, and the other end of the third capacitor is connected to the controller module.

[0009] The present invention also provides a relay non-contact voltage measurement method, comprising: S1: Pass the static contact circuit of the relay through the static contact non-contact voltage sensor, and pass the moving contact circuit of the relay through the moving contact non-contact voltage sensor; S2: transmitting the moving contact voltage measured by the moving contact non-contact voltage sensor and the static contact voltage measured by the static contact non-contact voltage sensor to a differential signal processing module for amplification to obtain an amplified moving and static contact differential voltage; S3: The amplified moving and static contact difference voltage is transmitted to the controller module, and the controller module determines the working state of the measured relay.

[0010] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: The present invention provides a relay non-contact voltage measurement device and a measurement method thereof, which measure the voltage of the relay by using a non-contact voltage module. The safety of the measurement process is greatly improved. By avoiding direct contact with the circuit, the risk of electric shock is eliminated, ensuring the safety of the operator. The technology does not require physical connection to the circuit, avoids the potential dangers in traditional contact measurement, and reduces interference with the measurement circuit, which helps to maintain the stable operation of the circuit.

[0011] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a structural block diagram of a relay non-contact voltage measuring device provided by the present invention; Figure 2 It is a structural schematic diagram of the non-contact voltage sensor provided by the present invention; Figure 3 is a structural schematic diagram of a differential signal processing module provided by the present invention; Figure 4 The present invention provides a flow chart of a relay non-contact voltage measurement method.

[0014] Reference numerals: 11. The moving contact circuit of the relay; 12. The static contact circuit of the relay; 13. The moving contact non-contact voltage sensor; 14. The static contact non-contact voltage sensor; 15. The differential signal processing module; 16. The controller module; 21. The inductive metal measurement layer; 22. The intermediate isolation dielectric layer; 23. The external metal shielding layer; 24. The wire placement hole; 31. The first amplifier; 32. The second amplifier; 33. The third amplifier; 34. The first resistor; 35. The second resistor; 36. The third resistor; 37. The fourth resistor; 38. The fifth resistor; 39. The sixth resistor; 40. The first coupling capacitor; 41. The second coupling capacitor; 42. The third capacitor. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme in the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0016] The terms “first”, “second” and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0017] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0018] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0019] Example Combine the following Figures 1 to 4 Describing the Invention: like Figure 1 As shown, the embodiment of the present invention provides a relay non-contact voltage measurement device including: a power supply module, a non-contact voltage sensor, a differential signal processing module 15 and a controller module 16; The non-contact voltage sensor is electrically connected to the differential signal processing module 15; The differential signal processing module 15 is electrically connected to the controller module 16; The power supply module is electrically connected to the non-contact voltage sensor, the differential signal processing module 15 and the controller module 16; The power supply module is used to supply power to the non-contact voltage sensor, the differential signal processing module 15 and the controller module 16; The non-contact voltage sensor includes a moving contact non-contact voltage sensor 13 and a stationary contact non-contact voltage sensor 14; The moving contact non-contact voltage sensor 13 is connected to the moving contact circuit 11 of the relay to measure the moving contact voltage; The static contact non-contact voltage sensor 14 is connected to the static contact circuit 12 of the relay to measure the static contact voltage; The differential signal processing module 15 is used to amplify the moving contact differential voltage, wherein the moving contact differential voltage is the difference between the moving contact voltage and the static contact voltage; The controller module 16 determines the operating state of the relay according to the amplified voltage difference between the moving and static contacts.

[0020] Specifically, Figure 2 As shown, the non-contact voltage sensor includes: a wire placement hole 24 , an inductive metal measurement layer 21 , an intermediate isolation medium layer 22 and an external metal shielding layer 23 .

[0021] The inductive metal measuring layer 21 has a wire placement hole 24, wherein the moving contact circuit is inserted into the wire placement hole 24 of the moving contact non-contact voltage sensor, and the stationary contact circuit is inserted into the wire placement hole 24 of the stationary contact non-contact voltage sensor. The inductive metal measuring layer 21 is used to sense voltage changes and measure voltage.

[0022] The middle isolation dielectric layer 22 is coated on the outside of the inductive metal measuring layer 21 , and the middle isolation dielectric layer 22 is used to isolate external disturbances and prevent the inductive metal measuring layer 21 and the external metal shielding layer 23 from generating parasitic capacitance.

[0023] The external metal shielding layer 23 is coated on the outside of the intermediate isolation dielectric layer 22 , and the external metal shielding layer 23 is used to shield external electric field interference.

[0024] Specifically, Figure 3 As shown, the differential signal processing module 15 includes: a first amplifier 31, a second amplifier 32, a third amplifier 33, a first resistor 34, a second resistor 35, a third resistor 36, a fourth resistor 37, a fifth resistor 38, a sixth resistor 39, a first coupling capacitor 40, a second coupling capacitor 41, and a third capacitor 42. One end of the first coupling capacitor 40 is connected to the moving contact non-contact voltage sensor 13, and the other end of the first coupling capacitor 40 is connected to one end of the sixth resistor 39; One end of the second coupling capacitor 41 is connected to the static contact non-contact voltage sensor 14, and the other end of the second coupling capacitor 41 is connected to the other end of the sixth resistor 39; One end of the sixth resistor 39 is connected to the positive input end of the first amplifier 31, and the other end of the sixth resistor 39 is connected to the positive input end of the second amplifier 32; The output terminal of the first amplifier 31 is connected to the negative input terminal of the first amplifier 31; The output terminal of the second amplifier 32 is connected to the negative input terminal of the second amplifier 32; One end of the first resistor 34 is connected to the output end of the first amplifier 31 , and the other end of the first resistor 34 is connected to the negative input end of the third amplifier 33 ; One end of the third resistor 36 is connected to the output end of the second amplifier 32, and the other end of the third resistor 36 is connected to the positive input end of the third amplifier 33; One end of the second resistor 35 is connected to the other end of the first resistor 34 , and the other end of the second resistor 35 is connected to the output end of the third amplifier 33 ; One end of the fourth resistor 37 is connected to the other end of the third resistor 36 , and the other end of the fourth resistor 37 is connected to one end of the third capacitor 42 ; One end of the fifth resistor 38 is connected to the output end of the third amplifier 33, and the other end of the fifth resistor 38 is connected to the other end of the third capacitor 42; One end of the third capacitor 42 is grounded, and the other end of the third capacitor 42 is connected to the controller module 16 .

[0025] Among them, the first coupling capacitor 40 and the first amplifier 31 form a voltage follower, and similarly, the second coupling capacitor 41 and the second amplifier 32 form another voltage follower. The voltage follower has the characteristics of large input impedance and small output impedance and has a certain isolation voltage function. At the same time, the sixth resistor 39 is respectively connected to the first coupling capacitor 40 and the second coupling capacitor 41 to isolate the AC signal.

[0026] The first resistor 34 and the third resistor 36 have the same resistance value, the second resistor 35 and the fourth resistor 37 have the same resistance value, and the amplification factor of the third amplifier 33 is adjusted by changing the organizational ratio of the first resistor 34 and the second resistor 35 .

[0027] The fifth resistor 38 and the third capacitor 42 form a high-frequency passive filtering circuit for filtering low-frequency signals.

[0028] The amplified voltage difference between the moving and static contacts is input to the controller module 16, which is an oscilloscope. The working state and working condition of the relay can be determined by observing the waveform of the oscilloscope.

[0029] like Figure 4 As shown, an embodiment of the present invention also provides a relay non-contact voltage measurement method, comprising: S1: Pass the static contact circuit of the relay through the static contact non-contact voltage sensor, and pass the moving contact circuit of the relay through the moving contact non-contact voltage sensor; S2: transmitting the moving contact voltage measured by the moving contact non-contact voltage sensor and the static contact voltage measured by the static contact non-contact voltage sensor to a differential signal processing module for amplification to obtain an amplified moving and static contact differential voltage; S3: The amplified moving and static contact difference voltage is transmitted to the controller module, and the controller module determines the working state of the measured relay.

[0030] The beneficial effects of the present invention are: 1. The present invention adopts a non-contact voltage measurement method, which greatly improves the safety of the measurement process. By avoiding direct contact with the circuit, the risk of electric shock is eliminated, ensuring the safety of the operator. This technology does not require physical connection to the circuit, avoiding the potential dangers in traditional contact measurement, while reducing interference with the measurement circuit, helping to maintain the stable operation of the circuit.

[0031] 2. Different from the traditional single-ended measurement method, the differential measurement method of the present invention can effectively eliminate the common ground problem, ensure accurate measurement in complex working environments, and make the sensor have good and stable output.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A relay non-contact voltage measuring device, characterized in that: include: Power module, non-contact voltage sensor, differential signal processing module and controller module; The non-contact voltage sensor is electrically connected to the differential signal processing module; The differential signal processing module is electrically connected to the controller module; The power supply module is electrically connected to the non-contact voltage sensor, the differential signal processing module and the controller module; The power supply module is used to supply power to the non-contact voltage sensor, the differential signal processing module and the controller module; The non-contact voltage sensor includes a moving contact non-contact voltage sensor and a stationary contact non-contact voltage sensor; The moving contact non-contact voltage sensor is connected to the moving contact circuit of the relay to measure the moving contact voltage; The static contact non-contact voltage sensor is connected to the static contact circuit of the relay to measure the static contact voltage; The differential signal processing module is used to amplify the moving contact differential voltage, wherein the moving contact differential voltage is the difference between the moving contact voltage and the static contact voltage; The controller module determines the operating state of the relay according to the amplified differential voltage between the moving and static contacts.

2. A relay non-contact voltage measuring device according to claim 1, characterized in that: The non-contact voltage sensor comprises: a wire placement hole, an inductive metal measurement layer, an intermediate isolation medium layer and an external metal shielding layer; The inductive metal measuring layer has a wire placement hole; The intermediate isolation dielectric layer is coated on the outside of the inductive metal measurement layer; The outer metal shielding layer is coated on the outer side of the middle isolation dielectric layer.

3. A relay non-contact voltage measuring device according to claim 2, characterized in that: The moving contact circuit is inserted into the wire placement hole of the moving contact non-contact voltage sensor, and the stationary contact circuit is inserted into the wire placement hole of the stationary contact non-contact voltage sensor.

4. A relay non-contact voltage measuring device according to claim 1, characterized in that: The differential signal processing module includes: a first amplifier, a second amplifier, a third amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first coupling capacitor, a second coupling capacitor, and a third capacitor. One end of the first coupling capacitor is connected to the moving contact non-contact voltage sensor, and the other end of the first coupling capacitor is connected to one end of the sixth resistor; One end of the second coupling capacitor is connected to the static contact non-contact voltage sensor, and the other end of the second coupling capacitor is connected to the other end of the sixth resistor; One end of the sixth resistor is connected to the positive input end of the first amplifier, and the other end of the sixth resistor is connected to the positive input end of the second amplifier; The output terminal of the first amplifier is connected to the negative input terminal of the first amplifier; The output terminal of the second amplifier is connected to the negative input terminal of the second amplifier; One end of the first resistor is connected to the output end of the first amplifier, and the other end of the first resistor is connected to the negative input end of the third amplifier; One end of the third resistor is connected to the output end of the second amplifier, and the other end of the third resistor is connected to the positive input end of the third amplifier; One end of the second resistor is connected to the other end of the first resistor, and the other end of the second resistor is connected to the output end of the third amplifier; One end of the fourth resistor is connected to the other end of the third resistor, and the other end of the fourth resistor is connected to one end of the third capacitor; One end of the fifth resistor is connected to the output end of the third amplifier, and the other end of the fifth resistor is connected to the other end of the third capacitor; One end of the third capacitor is grounded, and the other end of the third capacitor is connected to the controller module.

5. A relay non-contact voltage measuring device according to claim 1, characterized in that: The controller module is an oscilloscope.

6. A relay non-contact voltage measurement method, applied to a relay non-contact voltage measurement device as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: S1: Pass the static contact circuit of the relay through the static contact non-contact voltage sensor, and pass the moving contact circuit of the relay through the moving contact non-contact voltage sensor; S2: transmitting the moving contact voltage measured by the moving contact non-contact voltage sensor and the static contact voltage measured by the static contact non-contact voltage sensor to a differential signal processing module for amplification to obtain an amplified moving and static contact difference voltage; S3: The amplified moving and static contact difference voltage is transmitted to the controller module, and the controller module determines the working state of the measured relay.

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