A high-power contactor hot-state detection device

Abstract

This application provides a high-power contactor thermal testing device, belonging to the technical field of high-power contactor performance testing. The device includes a coil contact current sensor T1 for measuring the operating current flowing through the coil contacts; a coil contact voltage sensor T2 for measuring the operating voltage across the coil contacts; a shunt T5 connected in parallel across the main contacts; a main contact current sensor T3 for measuring the operating voltage across the shunt T5; a main contact voltage sensor T4 for measuring the operating voltage across the main contacts; and an A / D conversion module T6 connected to the coil contact current sensor T1, coil contact voltage sensor T2, main contact current sensor T3, and main contact voltage sensor T4. The A / D conversion module T6 also connects to a host computer software system. This device can measure the coil contacts and main contacts during operation without disassembling the wiring, saving manpower and resources.

Description

Technical Field

[0001] This utility model belongs to the field of high-power contactor performance testing technology, and in particular relates to a high-power contactor thermal testing device. Background Technology

[0002] High-power contactors are important power control devices for aviation ground power supply systems. The parameters that reflect the working performance of high-power contactors are the coil resistance and the contact resistance of the main contacts. The coil resistance and the contact resistance of the main contacts need to be tested regularly.

[0003] The previous testing method involved disconnecting all electrical connections related to the contactor after the equipment was shut down, and then measuring the resistance using a multimeter. The main problems were: first, the process was cumbersome and labor-intensive, as an aviation ground power supply unit typically requires more than a dozen contactors, and the entire measurement process required a significant amount of manpower and resources; second, the two resistance values ​​were very small, with the coil resistance being only tens of ohms and the contact resistance only a few tenths of an ohm, making it difficult for a multimeter to measure accurately.

[0004] Therefore, this application provides a high-power contactor thermal detection device. Utility Model Content

[0005] This invention provides a high-power contactor thermal detection device to at least solve the problems of cumbersome detection process and large workload in the prior art.

[0006] The detection device includes:

[0007] Coil contact current sensor T1, coil contact voltage sensor T2, main contact current sensor T3, main contact voltage sensor T4, shunt T5, and A / D conversion module T6;

[0008] The coil contact current sensor T1 is used to measure the operating current flowing through the coil contacts of the high-power contactor T0.

[0009] The coil contact voltage sensor T2 is used to measure the operating voltage across the coil contacts of the high-power contactor T0.

[0010] The shunt T5 is connected in parallel across the two ends of the main contacts of the high-power contactor T0;

[0011] The main contact current sensor T3 is used to measure the operating voltage across the shunt T5.

[0012] The main contact voltage sensor T4 is used to measure the working voltage across the main contacts of the high-power contactor T0.

[0013] The A / D conversion module T6 is connected to the coil contact current sensor T1, the coil contact voltage sensor T2, the main contact current sensor T3, and the main contact voltage sensor T4, respectively.

[0014] The A / D conversion module T6 is also used to connect to the host computer software system.

[0015] Furthermore, the A / D conversion module T6 is connected to the current output terminal I1OUT of the coil contact current sensor T1;

[0016] The A / D conversion module T6 is connected to the voltage output terminal V1 OUT of the coil contact voltage sensor T2;

[0017] The A / D conversion module T6 is connected to the voltage output terminal V2 OUT of the main contact current sensor T3;

[0018] The A / D conversion module T6 is connected to the voltage output terminal V3 OUT of the main contact voltage sensor T4.

[0019] Furthermore, I1 IN+ and I1 IN- of the coil contact current sensor T1 are used to connect the two ends of the coil contact of the high-power contactor T0, respectively.

[0020] The +VIN and -VIN of the coil contact voltage sensor T2 are used to connect to the two ends of the coil contact of the high-power contactor T0, respectively.

[0021] The +VIN and -VIN pins of the main contact current sensor T3 are used to connect to the two ends of the shunt T5, respectively.

[0022] The +VIN and -VIN pins of the main contact voltage sensor T4 are used to connect to the two ends of the main contact of the high-power contactor T0, respectively.

[0023] Furthermore, the A / D conversion module uses a USB data acquisition unit with the model number USB-4711A.

[0024] Furthermore, the coil contact current sensor T1 is a DC current sensor with model number CE-IZ06-34ES3-1.0.

[0025] Furthermore, the coil contact voltage sensor T2 is an AC / DC voltage sensor with model number WBV121S07.

[0026] Furthermore, the main contact current sensor T3 is an AC / DC voltage sensor with model number WBV121S07.

[0027] Furthermore, the main contact voltage sensor T4 is an AC / DC voltage sensor with model number WBV121S07.

[0028] Furthermore, the detection device also includes a power supply module, which is connected to the coil contact current sensor T1, the coil contact voltage sensor T2, the main contact current sensor T3, and the main contact voltage sensor T4, respectively.

[0029] Furthermore, the power module adopts one of the following power supply models:

[0030] URA2412LD and URB2412LD.

[0031] As can be seen from the above technical solutions, this utility model has the following advantages:

[0032] The high-power contactor hot-state detection device provided in this application can measure the coil resistance and main contact contact resistance of a high-power contactor in a hot state, i.e., in the working state. This device does not require disassembling the wiring and can accurately and quickly measure the two resistance values, saving manpower and resources. Attached Figure Description

[0033] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of a high-power contactor thermal detection device. Detailed Implementation

[0035] Various embodiments of this disclosure will be described more fully in the following detailed description of the high-power contactor thermal detection device. This disclosure may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of this disclosure to the specific embodiments disclosed herein, but rather this disclosure should be understood to cover all adjustments, equivalents, and / or alternatives falling within the spirit and scope of the various embodiments of this disclosure.

[0036] In the following, the terms “comprising” or “may include” as used in the various embodiments of this disclosure indicate the presence of the disclosed functions, operations, or elements, and do not limit the addition of one or more functions, operations, or elements. Furthermore, as used in the various embodiments of this disclosure, the terms “comprising,” “having,” and their cognates are intended only to indicate a particular feature, number, element, component, or combination of the foregoing, and should not be construed as primarily excluding the presence of one or more other features, numbers, elements, components, or combinations of the foregoing, or the possibility of adding one or more combinations of the foregoing.

[0037] In various embodiments of this disclosure, the expression "or" or "at least one of A and / or B" includes any combination or all combinations of the words listed simultaneously. For example, the expression "A or B" or "at least one of A and / or B" may include A, may include B, or may include both A and B.

[0038] The terms used in the various embodiments of this disclosure (such as "first," "second," etc.) may modify various components in the various embodiments, but do not limit the corresponding components. For example, the above terms do not limit the order and / or importance of the components. The above terms are only used for the purpose of distinguishing one component from others. For example, a first user device and a second user device refer to different user devices, although both are user devices. For example, a first component may be referred to as a second component without departing from the scope of the various embodiments of this disclosure, and similarly, a second component may also be referred to as a first component.

[0039] It should be noted that if a description is made of "connecting" one component to another, then the first component can be directly connected to the second component, and a third component can be "connected" between the first and second components. Conversely, when a component is "directly connected" to another component, it can be understood that there is no third component between the first and second components.

[0040] The term "user" as used in various embodiments of this disclosure may refer to a person using an electronic device, and may be a monitoring person, a testing person, or an operator.

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] This application provides a high-power contactor thermal detection device, which solves the current urgent technical problem of a cumbersome and labor-intensive detection process.

[0043] The technical solutions proposed in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0044] Figure 1 This is a schematic block diagram of a high-power contactor thermal detection device provided in an embodiment of this application. Figure 1As shown, the detection device includes: coil contact current sensor T1, coil contact voltage sensor T2, main contact current sensor T3, main contact voltage sensor T4, shunt T5, and A / D conversion module T6.

[0045] The coil contact current sensor T1 is used to measure the operating current flowing through the coil contacts of the high-power contactor T0. The coil contact voltage sensor T2 is used to measure the operating voltage across the coil contacts of the high-power contactor T0.

[0046] The shunt T5 is connected in parallel across the main contacts of the high-power contactor T0. The main contact current sensor T3 is used to measure the operating voltage across the shunt T5. The main contact voltage sensor T4 is used to measure the operating voltage across the main contacts of the high-power contactor T0.

[0047] The working voltage at both ends of the coil contacts and the working voltage at both ends of the main contacts are isolated and detected by voltage sensors (coil contact voltage sensor T2 and main contact voltage sensor T4). The wiring method is to draw power in parallel at both ends of the test point.

[0048] The operating current flowing through the coil needs to be detected by a current sensor (coil contact current sensor T1). In order to reduce the impact on the power supply system, a through-hole DC leakage current sensor is selected for the current sensor (coil contact current sensor T1), and the wiring method is to draw power through the test cable.

[0049] The operating current of the main contacts is isolated and detected using a millivolt-level voltage sensor (main contact current sensor T3). The wiring method is to draw power in parallel from both ends of the original vehicle's shunt T5 and then transmit it to the millivolt-level voltage sensor (main contact current sensor T3) for isolation and detection.

[0050] The A / D conversion module T6 is connected to the coil contact current sensor T1, the coil contact voltage sensor T2, the main contact current sensor T3, and the main contact voltage sensor T4, respectively. The A / D conversion module T6 is also used to connect to the host computer software system.

[0051] The coil resistance and main contact resistance of a high-power contactor can reflect its working performance. According to the formula R=U / I, the working parameters related to the coil resistance and the main contact resistance are the working voltage applied across the coil, the working current flowing through the coil, the working voltage across the main contacts, and the working current flowing through the main contacts.

[0052] Therefore, in the operating state (hot state) of the high-power contactor, the working current flowing through the coil contacts of the high-power contactor T0 is measured by the coil contact current sensor T1, the working voltage across the coil contacts of the high-power contactor T0 is measured by the coil contact voltage sensor T2, the working voltage across the main contacts of the high-power contactor T0 is measured by the main contact current sensor T3, and the working voltage across the main contacts of the high-power contactor T0 is measured by the main contact voltage sensor T4.

[0053] Subsequently, the A / D conversion module T6 converts the above four parameters from analog signals into digital signals that can be displayed by the host computer software system. The host computer software system intuitively displays the working current flowing through the coil contacts of the high-power contactor T0, the working voltage across the coil contacts of the high-power contactor T0, the working voltage across the main contacts of the high-power contactor T0, and the working voltage across the main contacts of the high-power contactor T0. Based on the above parameters, the coil resistance and the contact resistance of the main contacts are calculated according to the formula R=U / I, thereby realizing the detection of the working performance of the high-power contactor under hot conditions. This detection device does not require disassembly of the wiring and can accurately and quickly measure the two resistance values, saving manpower and resources.

[0054] In an exemplary embodiment, the A / D conversion module T6 is connected to the current output terminal I1 OUT of the coil contact current sensor T1;

[0055] The A / D conversion module T6 is connected to the voltage output terminal V1 OUT of the coil contact voltage sensor T2;

[0056] The A / D conversion module T6 is connected to the voltage output terminal V2 OUT of the main contact current sensor T3;

[0057] The A / D conversion module T6 is connected to the voltage output terminal V3 OUT of the main contact voltage sensor T4.

[0058] According to another embodiment of the present invention, I1 IN+ and I1 IN- of the coil contact current sensor T1 are respectively used to connect the two ends of the coil contact of the high-power contactor T0; I1 IN+ and I1 IN- are the current input ports of the coil contact current sensor T1, used to receive the working current of the coil contact of the high-power contactor being measured.

[0059] The +VIN and -VIN of the coil contact voltage sensor T2 are used to connect to the two ends of the coil contact of the high-power contactor T0, respectively.

[0060] The +VIN and -VIN pins of the main contact current sensor T3 are used to connect to the two ends of the shunt T5, respectively.

[0061] The +VIN and -VIN pins of the main contact voltage sensor T4 are used to connect to the two ends of the main contacts of the high-power contactor T0, respectively. VIN is the input voltage port of the voltage sensor, used to receive the measured voltage signal.

[0062] Furthermore, as a refinement and extension of the specific implementation of the above embodiments, in order to fully illustrate the specific implementation process of this embodiment, another high-power contactor thermal detection device is provided, and the A / D conversion module adopts a USB data acquisition unit of model USB-4711A.

[0063] The USB-4711A A / D conversion module offers stable performance, with a maximum acquisition speed of 150K / s, 12-bit conversion accuracy, 16 conversion channels, a 1K word FIFO acquisition buffer, and a USB 2.0 interface. The actual acquisition speed is controlled at 5K / s. Since the acquired signals are all DC, according to the Nyquist sampling theorem, a complete signal acquisition can be achieved if the acquisition speed exceeds twice the frequency of the acquired signal. Therefore, this A / D conversion module meets the acquisition requirements of this invention.

[0064] It should be further noted that, to meet the requirements of measurement accuracy and response time, the coil contact current sensor T1 is a DC current sensor with model number CE-IZ06-34ES3-1.0. The input current range of the coil contact current sensor T1 is 0-1A, and the output voltage range is 0-5V; the coil contact current sensor T1 is powered by 12V.

[0065] Based on the above embodiments, in order to further improve the high-power contactor thermal detection device provided in the above embodiments, and as an implementable method, in one embodiment, the coil contact voltage sensor T2 is an AC / DC voltage sensor of model WBV121S07. The input voltage range of the coil contact voltage sensor T2 is 0-50V, and the output voltage range of the coil contact voltage sensor T2 is 0-5V; the coil contact voltage sensor T2 is powered by ±12V.

[0066] In one embodiment, the main contact current sensor T3 is an AC / DC voltage sensor of model WBV121S07.

[0067] The input voltage range of the main contact current sensor T3 is 0-75mV, and it takes a 0-75mV shunt signal from the ammeter. The output voltage range of the main contact current sensor T3 is 0-5V. The main contact current sensor T3 is powered by ±12V.

[0068] It should be noted that, because the transient signal of the main contact voltage needs to be monitored and recorded, the voltage sensor is required to have high accuracy, fast response, and good stability. The main contact voltage sensor T4 is a WBV121S07 AC / DC voltage sensor. The WBV121S07 AC / DC voltage sensor is an industrial-grade voltage sensor with an accuracy of 0.2% and an output response time of <15µs, which fully meets the requirements for measurement accuracy and response time.

[0069] The input voltage range of the main contact voltage sensor T4 is 0-1V, and the output voltage range of the main contact voltage sensor T4 is 0-5V; the main contact voltage sensor T4 is powered by ±12V.

[0070] According to an embodiment of this application, the detection device further includes a power supply module, which is connected to the coil contact current sensor T1, the coil contact voltage sensor T2, the main contact current sensor T3, and the main contact voltage sensor T4, respectively.

[0071] As an example, the power module uses one of the following power supply models:

[0072] URA2412LD and URB2412LD. The power modules can achieve a wide voltage input ratio of 1:4, making them suitable for applications with unstable input power.

[0073] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0074] For those skilled in the art, designing different forms of control circuits based on the teachings of this invention does not require creative effort. Changes, modifications, substitutions, and variations made to the embodiments without departing from the principles and spirit of this invention still fall within the protection scope of this invention.

Claims

1. A high-power contactor thermal detection device, characterized in that, The detection device includes: Coil contact current sensor T1, coil contact voltage sensor T2, main contact current sensor T3, main contact voltage sensor T4, shunt T5, and A / D conversion module T6; The coil contact current sensor T1 is used to measure the operating current flowing through the coil contacts of the high-power contactor T0. The coil contact voltage sensor T2 is used to measure the operating voltage across the coil contacts of the high-power contactor T0. The shunt T5 is connected in parallel across the two ends of the main contacts of the high-power contactor T0; The main contact current sensor T3 is used to measure the operating voltage across the shunt T5. The main contact voltage sensor T4 is used to measure the working voltage across the main contacts of the high-power contactor T0. The A / D conversion module T6 is connected to the coil contact current sensor T1, the coil contact voltage sensor T2, the main contact current sensor T3, and the main contact voltage sensor T4, respectively. The A / D conversion module T6 is also used to connect to the host computer software system.

2. The high-power contactor thermal detection device as described in claim 1, characterized in that, The A / D conversion module T6 is connected to the current output terminal I1 OUT of the coil contact current sensor T1; The A / D conversion module T6 is connected to the voltage output terminal V1 OUT of the coil contact voltage sensor T2; The A / D conversion module T6 is connected to the voltage output terminal V2 OUT of the main contact current sensor T3; The A / D conversion module T6 is connected to the voltage output terminal V3 OUT of the main contact voltage sensor T4.

3. The high-power contactor thermal detection device as described in claim 2, characterized in that, The I1 IN+ and I1 IN- of the coil contact current sensor T1 are used to connect to the two ends of the coil contact of the high-power contactor T0, respectively. The +VIN and -VIN of the coil contact voltage sensor T2 are used to connect to the two ends of the coil contact of the high-power contactor T0, respectively. The +VIN and -VIN pins of the main contact current sensor T3 are used to connect to the two ends of the shunt T5, respectively. The +VIN and -VIN pins of the main contact voltage sensor T4 are used to connect to the two ends of the main contact of the high-power contactor T0, respectively.

4. The high-power contactor thermal detection device as described in claim 1, characterized in that, The A / D conversion module uses a USB data acquisition unit of model USB-4711A.

5. The high-power contactor thermal detection device as described in claim 4, characterized in that, The coil contact current sensor T1 is a DC current sensor with model number CE-IZ06-34ES3-1.

0.

6. The high-power contactor thermal detection device as described in claim 5, characterized in that, The coil contact voltage sensor T2 is an AC / DC voltage sensor with model number WBV121S07.

7. The high-power contactor thermal detection device as described in claim 1, characterized in that, The main contact current sensor T3 is an AC / DC voltage sensor with model number WBV121S07.

8. The high-power contactor thermal detection device as described in claim 7, characterized in that, The main contact voltage sensor T4 is an AC / DC voltage sensor with model number WBV121S07.

9. The high-power contactor thermal detection device as described in claim 1, characterized in that, The detection device also includes a power supply module, which is connected to the coil contact current sensor T1, the coil contact voltage sensor T2, the main contact current sensor T3, and the main contact voltage sensor T4, respectively.

10. The high-power contactor thermal detection device as described in claim 9, characterized in that, The power module uses one of the following power supply models: URA2412LD and URB2412LD.

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