A SSPC-based insulation resistance detection method and SSPC

Abstract

The application provides an SSPC-based insulation resistance detection method and SSPC. The detection method is an insulation resistance detection method for the power output of the SSPC channel and the shell ground, and the power ground of the SSPC channel and the shell ground. The detection method is an insulation resistance detection method for the SSPC channel under the conditions of active power voltage input and reactive power voltage input. The detection method is an insulation resistance detection method for the SSPC channel under the conditions of active power voltage input and reactive power voltage input. The detection method is an insulation resistance detection method for the SSPC channel under the conditions of active power voltage input and reactive power voltage input. The detection method is an insulation resistance detection method for the SSPC channel under the conditions of active power voltage input and reactive power voltage input. The detection method is an insulation resistance detection method for the SSPC channel under the conditions of active power voltage input and reactive power voltage input. The detection method is an insulation resistance detection method for the SSPC channel under the conditions of active power voltage input and reactive power voltage input. The detection method is an insulation resistance detection method for the SSPC channel under the conditions of active power voltage input and reactive power voltage input. The detection method is an insulation resistance detection method for the SSPC channel under the conditions of active power voltage input and reactive power voltage input. The detection method is an insulation resistance detection method for the SSPC channel under the conditions of active power voltage input and reactive power voltage input. The detection method is an insulation resistance detection method for the SSPC channel under the conditions of active power voltage input and reactive power voltage input. The detection method is an insulation resistance detection method for the SSPC channel under the conditions of active power voltage input and reactive power voltage input. The detection method is an insulation resistance detection method for the SSPC channel under the conditions of active power voltage input and reactive power voltage input. The detection method is an insulation resistance detection method for the SSPC channel under the conditions of active power voltage input and reactive power voltage input. The detection method is an insulation resistance detection method for the SSPC channel under the conditions of active power voltage input and reactive power voltage input. The detection method is an insulation resistance detection

Description

Technical Field

[0001] This invention relates to aviation power distribution systems, belonging to the fields of power distribution systems and fault detection, specifically to an insulation resistance detection method based on SSPC and SSPC. Background Technology

[0002] SSPC stands for Solid State Power Controller. It is an intelligent switching device with protective functions, similar in function to traditional circuit breakers, fuses and relays connected in series, or other control and protection devices. However, it significantly outperforms these traditional devices in performance and functionality. It can control the on / off state of load power circuits, collect current, input voltage, and output voltage of the load power circuit, and has overcurrent and short-circuit protection functions. Furthermore, the solid state power controller can perform self-detection of the channel based on the load power circuit's current, input voltage, output voltage, and the channel's on / off status, trip (protection) status, etc., according to each status.

[0003] If the insulation performance at the SSPC output terminal is poor, it can lead to leakage or internal short circuits in the SSPC product, which in turn can damage the SSPC product and affect safety. Previously, to perform insulation resistance testing on each channel of the SSPC product, the product had to be de-energized, and external testing equipment had to be used to test each channel one by one, which could not achieve self-testing of insulation resistance. Summary of the Invention

[0004] The purpose of this invention is to provide an insulation resistance detection method and SSPC based on SSPC, so as to improve the fault diagnosis capability of SSPC.

[0005] The first aspect of this invention provides an insulation resistance detection method based on SSPC, applied to at least two mutually communicative SSPCs, the method comprising:

[0006] S1. Before connecting the load, control the first SSPC under test and the second SSPC under test to conduct, and obtain the output voltage U3 and channel current i1 of the first SSPC under test, and the output voltage U4 and channel current i2 of the second SSPC under test.

[0007] S2. Control the first SSPC under test to turn on and the second SSPC under test to turn off, and reacquire the output voltage U3' and channel current i1' of the first SSPC under test.

[0008] S3. Control the first SSPC under test to turn off and the second SSPC under test to turn on, and reacquire the output voltage U4' and channel current i2' of the second SSPC under test.

[0009] S4. According to the following formulas, obtain the insulation resistance Riso1 of the output terminal of the first SSPC under test to the chassis ground, the insulation resistance Riso2 of the output terminal of the second SSPC under test to the chassis ground, and the insulation resistance Riso3 of the power ground to the chassis ground.

[0010] ;

[0011] ;

[0012] ;

[0013] Optionally, after S4, the method further includes:

[0014] S5. When Riso3 is 0, confirm that the power ground and the chassis ground are connected; otherwise, output a power ground and chassis ground connection reminder message.

[0015] Optionally, after S4, the method further includes:

[0016] S6. When the values ​​of Riso1 and Riso2 are greater than the preset values, it is determined that the SSPC has good insulation.

[0017] Optionally, prior to S1, the method further includes:

[0018] It was confirmed that both the first and second SSPCs under test were online.

[0019] Optionally, each SSPC's input terminal is connected to a power busbar, which receives external power input or power module input; the method further includes:

[0020] If one of the first and second SSPCs under test is online and the other is offline, a fault will be reported.

[0021] If neither the first SSPC under test nor the second SSPC under test is online, the control power module supplies power to the power busbar and checks again whether both the first SSPC under test and the second SSPC under test are online; if one SSPC is offline, a fault is reported.

[0022] Optionally, the method further includes:

[0023] Measure Riso1, Riso2, and Riso3 multiple times and calculate the average.

[0024] A second aspect of the present invention provides an SSPC, comprising: a CPU, a power busbar, a power supply module, and at least two SSPC modules;

[0025] Each SSPC module is connected to the power busbar and the CPU. The power busbar receives external power input or power module input.

[0026] The CPU is used to execute the method as described in any one of the first aspects.

[0027] Optionally, a reverse protection diode is provided between the power module and the power busbar.

[0028] The beneficial effects of this invention are:

[0029] This invention provides an insulation resistance detection method and an SSPC based on SSPC. By measuring the insulation resistance of the input and output channels of the SSPC, the insulation status of power distribution equipment can be self-checked and fault warnings can be provided, thereby improving the reliability of aviation power distribution networks. In the aviation field, the insulation resistance at the output end is detected through SSPC self-testing, improving the fault diagnosis capability of the aircraft power distribution network. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a block diagram illustrating the principle of insulation resistance detection at the output of the SSPC.

[0032] Figure 2 This is a flowchart of the insulation resistance detection method at the output terminal of SSPC. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0035] In the description of this invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the invention, and should not be construed as limiting the invention. Furthermore, the use of ordinal numbers (e.g., "first and second," etc.) is for distinguishing objects and is not limited to this order, and should not be construed as indicating or implying relative importance.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, encompassing both direct connection and indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0037] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0039] The objective of this invention can be achieved through the following technical solutions:

[0040] like Figure 1As shown, an SSPC product includes a CPU, a power busbar, a power module, and at least two SSPC modules. Each SSPC module is connected to the power busbar and the CPU. The power busbar receives external power input or power module input. A reverse protection diode is installed between the power module and the power busbar. The insulation resistance between the output terminal of the first SSPC under test and the chassis ground is Riso1, the insulation resistance between the output terminal of the second SSPC under test and the chassis ground is Riso2, and the insulation resistance between the power ground and the chassis ground is Riso3.

[0041] like Figure 2 As shown, an insulation resistance detection method based on SSPC is as follows:

[0042] Each SSPC determines its online status by collecting its input voltage. If one of the first and second SSPCs under test is online and the other is offline, a fault is reported. If both the first and second SSPCs under test are offline, the CPU is notified via the internal bus. The CPU then controls the power module to supply power to the power busbar and checks again to see if both the first and second SSPCs under test are online. If one SSPC is offline, a fault is reported.

[0043] When all SSPCs are confirmed to be online, firstly, the first and second SSPCs under test are turned on to obtain the output voltage U3 and channel current i1 of the first SSPC under test, and the output voltage U4 and channel current i2 of the second SSPC under test; secondly, the first SSPC under test is turned on and the second SSPC under test is turned off, and the output voltage U3' and channel current i1' of the first SSPC under test are obtained again; then, the first SSPC under test is turned off and the second SSPC under test is turned on, and the output voltage U4' and channel current i2' of the second SSPC under test are obtained again; finally, according to the following formulas, the insulation resistance Riso1 of the output terminal of the first SSPC under test to the chassis ground, the insulation resistance Riso2 of the output terminal of the second SSPC under test to the chassis ground, and the insulation resistance Riso3 of the power ground to the chassis ground are obtained;

[0044] ;

[0045] ;

[0046] .

[0047] Repeat the above steps to average the insulation resistance values ​​measured multiple times to obtain the final resistance value.

[0048] The obtained resistance values ​​of Riso1 and Riso2 are compared with preset values ​​respectively. When the resistance value is greater than the preset value, it is determined that the SSPC has good insulation; when either resistance value is less than the preset value, it is determined that the SSPC has poor insulation performance and a fault is reported.

[0049] If Riso3 is 0, it is determined that the power ground and the chassis ground are connected; otherwise, a power ground and chassis ground connection reminder message is output.

[0050] The above detailed embodiments are a description of the present invention. It should not be considered that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, several simple deductions and substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the protection scope of the present invention.

Claims

1. A SSPC-based insulation resistance detection method, characterized in that, Applied to at least two mutually communicating SSPCs, the method includes: S1. Before connecting the load, control the first SSPC under test and the second SSPC under test to conduct, and obtain the output voltage U3 and channel current i1 of the first SSPC under test, and the output voltage U4 and channel current i2 of the second SSPC under test. S2. Control the first SSPC under test to turn on and the second SSPC under test to turn off, and reacquire the output voltage U3' and channel current i1' of the first SSPC under test. S3. Control the first SSPC under test to turn off and the second SSPC under test to turn on, and reacquire the output voltage U4' and channel current i2' of the second SSPC under test. S4. According to the following formulas, obtain the insulation resistance Riso1 of the output terminal of the first SSPC under test to the chassis ground, the insulation resistance Riso2 of the output terminal of the second SSPC under test to the chassis ground, and the insulation resistance Riso3 of the power ground to the chassis ground. ； ； 。 2. The insulation resistance detection method based on SSPC according to claim 1, characterized in that, Following S4, the method further includes: S5. When Riso3 is 0, confirm that the power ground and the chassis ground are connected; otherwise, output a power ground and chassis ground connection reminder message.

3. The insulation resistance detection method based on SSPC according to claim 1, characterized in that, Following S4, the method further includes: S6. When the values ​​of Riso1 and Riso2 are greater than the preset values, it is determined that the SSPC has good insulation.

4. The insulation resistance detection method based on SSPC according to claim 1, characterized in that, Prior to S1, the method further includes: It was confirmed that both the first and second SSPCs under test were online.

5. The insulation resistance detection method based on SSPC according to claim 4, characterized in that, Each SSPC's input terminal is connected to a power busbar, which receives external power input or power module input; the method further includes: If one of the first and second SSPCs under test is online and the other is offline, a fault will be reported. If neither the first SSPC under test nor the second SSPC under test is online, the control power module supplies power to the power busbar and checks again whether both the first SSPC under test and the second SSPC under test are online; if one SSPC is offline, a fault is reported.

6. The insulation resistance detection method based on SSPC according to claim 1, characterized in that, The method further includes: Measure Riso1, Riso2, and Riso3 multiple times and calculate the average.

7. An SSPC, characterized in that, include: CPU, power busbar, power module, and at least two SSPC modules; Each SSPC module is connected to the power busbar and the CPU. The power busbar receives external power input or power module input. The CPU is used to execute the method as described in any one of claims 1-6.

8. The SSPC according to claim 7, characterized in that, Anti-reverse diodes are installed between the power module and the power busbar.

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