Cable water inlet detection device

Abstract

The utility model relates to the technical field of power cable detection, in particular to a cable water inlet detection device which comprises a microcontroller unit, a relay module, a charging module, a voltage acquisition module, an analog switch matrix and an aviation plug. A common end of the switching module is connected with an output end of the charging module and an input end of the voltage acquisition module, a normally open contact of the switching module is connected with a channel switching matrix total input line of the microcontroller unit, and a normally closed contact of the switching module is suspended or grounded; the microcontroller unit is connected with the charging module, the voltage acquisition module is connected with the microcontroller unit, the charging module and the voltage acquisition module are connected with the aviation plug through the analog switch matrix, and the analog switch matrix is connected with the microcontroller unit. According to the utility model, whether water enters the cable can be rapidly and accurately determined.

Description

TECHNICAL FIELD

[0001] The utility model relates to power cable detection technical field especially relates to a cable water detection device. BACKGROUND

[0002] Power cable and communication cable in the long-term operation process, may cause water to invade the cable inside due to external damage, insulation aging, joint sealing failure and other reasons, cable water will sharply accelerate insulation aging, cause water tree phenomenon, eventually lead to cable breakdown short circuit, cause major economic losses.

[0003] At present, there are two methods for testing cable water, one is to use the traditional insulation resistance tester to detect the water of the connecting cable of the electronic equipment, this method needs to disassemble the equipment, disconnect all sensitive circuits, the workload is large, and may cause such as poor contact, connection error, electrostatic discharge and other fault hidden dangers, and this method is easy to be disturbed in the humid environment, cannot effectively distinguish whether the surface is damp or the cable is waterlogged, and cannot judge the electrolyte corrosion formed after the cable water; another cable water test method is to apply direct current high voltage between each independent core wire of the cable and the core wire and the equipment shell, and the insulation performance is judged by measuring the leakage current; however, after the core wire of the electronic equipment is connected to the sensitive circuit, the insulation measurement cannot be carried out by applying direct current high voltage, which has the risk of causing the equipment to burn out. UTILITY MODEL CONTENTS

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a cable water detection device which can quickly and accurately judge whether there is water in the cable.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the main technical scheme including:

[0006] A kind of cable water detection device, including microcontroller unit, relay module, charging module, voltage acquisition module, analog switch matrix, aviation plug, the microcontroller unit is connected with relay module, relay module includes a main relay, its common terminal is connected with the output terminal of charging module and the input terminal of voltage acquisition module, its normally open contact is connected with the channel switching matrix total input line of microcontroller unit, its normally closed contact is suspended or grounded, for realizing the switching between the "charging" and "collection" two working modes;Microcontroller unit is connected with charging module, voltage acquisition module is connected with microcontroller unit, for when the device is in collection mode, the voltage value on current gating channel is collected;Charging module, voltage acquisition module are connected with aviation plug by analog switch matrix, analog switch matrix is connected with microcontroller unit, charging module, microcontroller unit are connected with power module, key module, microcontroller unit is connected with host computer by transmission module.

[0007] Further, the channel switching matrix of the microcontroller unit is composed of four analog switch chips, and the channels of each chip are connected to the pins of the aviation plug respectively; the common output ends of the four analog switch chips are connected to one end of the normally open contact of the main relay in parallel.

[0008] Further, the analog switch matrix is ADG408BRZ chip, and the input pins of the analog switch channels are connected to the pins of the aviation plug respectively, and the common output ends are connected in parallel.

[0009] Further, the main relay is an optoelectronic relay, so as to realize the electrical isolation between the charging high-voltage loop and the microcontroller unit.

[0010] Further, the microcontroller unit is STM32F103RCT6 microcontroller.

[0011] Further, the aviation plug is a 16PIN aviation plug, which is used for connecting 16 independent core wires of the cable to be detected and the cable shell.

[0012] Further, a shell is further included, the shell is internally provided with a mainboard, the mainboard is integrally provided with a microcontroller unit, a relay module, a charging module, a voltage acquisition module, an analog switch matrix, a power module, a transmission module and a key module, an aviation plug is arranged on one side wall of the shell, and a power switch connected with the power module and a function key connected with the key module are arranged on the opposite side wall of the shell.

[0013] The cable water intrusion detection device has the advantages that: the microcontroller unit, the relay module, the charging module, the voltage acquisition module, the analog switch matrix and the like are arranged, so that whether the cable to be detected is waterlogged can be quickly and accurately judged; the charging and discharging characteristics of the original battery are detected instead of the static resistance, so that the misjudgment caused by the environment humidity is effectively avoided, the serious waterlogging fault of the formed electrolyte can be accurately identified, the physical isolation of the relay for the charging and the measuring loop is adopted, the high-voltage charging pulse is prevented from damaging the precise measuring unit, and the stability and the service life of the device are improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is a cable water intrusion detection device module connection schematic view of the utility model;

[0015] Fig. 2 It is an external structure schematic view of the cable water intrusion detection device.

[0016] In the figure: 1 is a microcontroller unit, 2 is a relay module, 3 is a charging module, 4 is a voltage acquisition module, 5 is an analog switch matrix, 6 is an aviation plug, 7 is a power module, 8 is a transmission module, 9 is an upper computer, 10 is a key module, 11 is a shell, 12 is a mainboard, 13 is a power switch, 14 is a function key. DETAILED DESCRIPTION

[0017] In order to better explain the utility model, so as to facilitate understanding, the utility model is described in detail below by specific implementation mode in combination with the drawings.

[0018] The utility model provides a kind of cable water detection device, as shown in Figs. 1-2 The microcontroller unit 1 is connected with the relay module 2, specifically, the microcontroller unit 1 can be STM32F103RCT6 microcontroller, MCU, its built-in 12-bit ADC analog-digital converter and multiple timers / IO ports meet the needs of the device;The relay module 2 includes a main relay, the output end of its common end and the input end of voltage acquisition module 4 are connected with charging module 3, its normally open contact is connected with the channel switching matrix total input line of microcontroller unit 1, its normally closed contact is suspended or grounded, for realizing the switching of device between "charging" and "collection" two working modes;Specifically, the channel switching matrix of microcontroller unit 1 is composed of four analog switch chips, and the channels of each chip are connected to the pins of aviation plug 6 respectively;The common output end of four analog switch chips is connected with one end of the normally open contact of main relay after being connected in parallel. Specifically, the main relay is photoelectric relay, to realize the electrical isolation of charging high-voltage loop and microcontroller;More specifically, main relay can be Panasonic AQW214EH photoelectric MOS relay.

[0019] The microcontroller unit 1 is connected with the charging module 3, specifically, charging module 3 can be existing charging circuit, as long as it can realize safe charging function;Charging module 3 is controlled by main control MCU, for outputting a set voltage value of direct current charging voltage when system is in charging mode;Voltage acquisition module 4 is connected with microcontroller unit 1, specifically, voltage acquisition module 4 can be existing voltage acquisition circuit, and voltage acquisition module 4 is connected with the AD conversion pin of main control MCU, for collecting the voltage value on current gating channel when system is in collection mode.

[0020] The charging module 3 and the voltage collection module 4 are connected with the aviation plug 6 through the analog switch matrix 5, and the analog switch matrix 5 is connected with the microcontroller unit 1; specifically, the analog switch matrix 5 is an ADG408BRZ chip, input pins of a plurality of analog switch channels of the ADG408BRZ chip are connected with respective pins of the aviation plug 6, and a common output end is in parallel connection; more specifically, the analog switch matrix 5 is composed of four ADG408BRZ 8-channel multiplexer chips of Analog Devices, 8 sources of each chip are connected to 8 pins of a 16PIN aviation plug, the drains of the four chips are all short-circuited together to form a total common measurement end, and address selection lines and enable lines of the four chips are connected in parallel and controlled by four IO ports of the MCU; specifically, the aviation plug 6 is a 16PIN aviation plug.

[0021] The charging module 3 and the microcontroller unit 1 are connected with the power module 7 and the key module 10, the power module 7 supplies power to the charging module 3 and the microcontroller unit 1, and the microcontroller unit 1 is connected with the upper computer 9 through the transmission module 8 to send collected information to the upper computer, so that workers can observe.

[0022] Specifically, the cable water detection device further comprises a shell 11, specifically, the shell 11 can be a rectangular shell, a mainboard 12 is arranged in the shell 11, the microcontroller unit 1, the relay module 2, the charging module 3, the voltage collection module 4, the analog switch matrix 5, the power module 7, the transmission module 8 and the key module 10 are integrated on the mainboard 12, the aviation plug 6 is arranged on one side wall of the shell 11, a power switch 13 connected with the power module 7 and a function key 14 connected with the key module 10 are arranged on opposite side walls of the shell 11; the power switch 13 controls whether the device is powered on, and the function key 14 is used for controlling start and stop of the microcontroller unit 1.

[0023] When the cable is connected, the cable is first charged at 5V, and if there is water, the battery is charged, and after 5 seconds of charging, the charging is disconnected, at this time, the internal relay of the utility model is switched, and the AD collection and cable connection are switched. The utility model observes whether the AD collection cable voltage has a discharge curve, and if there is a discharge curve, it proves that there is water.

[0024] When the cable water detection device is used to detect whether the to-be-tested cable is waterlogged, first, 16 core wires and an armored layer / shield layer (a shell) of the to-be-tested cable are respectively connected to 16PIN aviation plugs of the cable water detection device, a power switch 13 is turned on, the device completes self-checking, a "start test" key of a function button 14 is pressed, an MCU outputs a high level, and a main relay is driven to be attracted; at this time, internal circuits of the system are switched to a charging mode, the MCU outputs the high level, a charging module 3 outputs a stable 5V voltage to the system, and a double-layer nested cycle is entered, all channel combination pairs (i, j) needing to be detected are traversed, wherein i and j are channel numbers (0 channel is usually predefined as a channel connected to a cable shell) from 0 to 15.

[0025] For each specific (i, j) channel (for example, channel 1 and channel 2):

[0026] The MCU outputs a specific binary address, simultaneously selects a corresponding channel in an analog switch of the analog switch matrix 5, maintains the selected state, and keeps charging for 5 seconds; the 5V voltage passes through the main relay and the analog switch matrix 5, and is applied to an impedance between channel 1 and channel 2, if a water-formed original battery exists between channel 1 and channel 2, the battery is charged.

[0027] When all preset channel combination pairs complete charging, the MCU outputs a low level, and the output of the charging module 3 is turned off; the MCU outputs the low level, the main relay is released, and the device is switched to a collection mode; at this time, a common end of the analog switch matrix 5 is connected to a voltage collection module 4.

[0028] The MCU traverses all channel combination pairs (i, j) again, for each (i, j), the channel pair (i, j) is selected again, after the selection, the voltage between the channel pair (i, j) is continuously collected through the voltage collection module 4, is transmitted to the upper computer 9 through the transmission module 8, the upper computer 9 displays the collected voltage, and a worker determines whether the to-be-tested cable is waterlogged according to whether the collected voltage exceeds a threshold value.

[0029] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary, and cannot be understood as limiting the utility model, and the ordinary skilled in the art can make changes, modifications, replacements and changes to the above-mentioned embodiments, which all belong to the range of the utility model.

Claims

1. A cable water ingress detection device, characterized by: The utility model relates to a kind of aviation power supply, including microcontroller unit (1), relay module (2), charging module (3), voltage acquisition module (4), analog switch matrix (5), aviation plug (6), the microcontroller unit (1) is connected with relay module (2), and relay module (2) includes a main relay, its common end is connected with the output end of charging module (3) and the input end of voltage acquisition module (4), its normally open contact is connected with the channel switching matrix total input line of microcontroller unit (1), its normally closed contact is suspended or grounded, microcontroller unit (1) is connected with charging module (3), voltage acquisition module (4) is connected with microcontroller unit (1), charging module (3), voltage acquisition module (4) are connected with aviation plug (6) by analog switch matrix (5), analog switch matrix (5) is connected with microcontroller unit (1), charging module (3), microcontroller unit (1) are connected with power module (7), button module (10), microcontroller unit (1) is connected with host computer (9) by transmission module (8).

2. The water ingress detection apparatus of claim 1, wherein: The channel switching matrix of the microcontroller unit (1) is composed of four analog switch chips, and the channels of each chip are connected to the pins of the aviation plug (6) respectively.

3. The water ingress detection apparatus of claim 1, wherein: The analog switch matrix (5) is ADG408BRZ chip, and the input pins of the analog switch channels are connected to the pins of the aviation plug (6) respectively.

4. The water ingress detection apparatus of claim 1, wherein: The main relay is an optoelectronic relay.

5. The water ingress detection apparatus of claim 1, wherein: The microcontroller unit (1) is STM32F103RCT6 microcontroller.

6. The water ingress detection apparatus of claim 1, wherein: The aviation plug (6) is a 16PIN aviation plug.

7. The water ingress detection apparatus of claim 1, wherein: Further including a shell (11), shell (11) is equipped with mainboard (12) in, mainboard (12) is integrated with microcontroller unit (1), relay module (2), charging module (3), voltage acquisition module (4), analog switch matrix (5), power module (7), transmission module (8), button module (10), the aviation plug (6) is equipped on the side wall of shell (11), power switch (13) connected with power module (7) and function button (14) connected with button module (10) are equipped on its opposite side wall.

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