CN210603166U - Cable conductor length detection device based on high-precision capacitance measurement - Google Patents
Cable conductor length detection device based on high-precision capacitance measurement Download PDFInfo
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- CN210603166U CN210603166U CN201921899558.2U CN201921899558U CN210603166U CN 210603166 U CN210603166 U CN 210603166U CN 201921899558 U CN201921899558 U CN 201921899558U CN 210603166 U CN210603166 U CN 210603166U
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Abstract
The utility model belongs to the technical field of cable detection, and discloses a cable conductor length detection device based on high-precision capacitance measurement, which comprises a constant current source, a voltage detection unit, an A/D conversion unit, a control unit, a length detection unit and an interface unit which are connected in sequence; the constant current source provides stable direct current voltage for other units of the detection device and the detected piece, the voltage detection unit is used for measuring the voltage of the detected piece, and the output of the voltage detection unit is converted by the A/D conversion unit and then is sent to the main control unit; the main control unit and the interface unit are electrically connected and used for obtaining the capacitance value of the tested piece according to the voltage detection value and the preset program; the length detection unit and the main control unit have a connection relation for signal interaction, and the length of the conductor of the tested piece is obtained by combining another preset program according to the capacitance value; the utility model provides a capacitance and length and visual display that this kind of device can be harmless, accurate measurement obtains the piece of being surveyed are applicable to the engineering field test demand.
Description
Technical Field
The utility model belongs to the technical field of the cable detects, more specifically relates to a cable conductor length detection device based on high accuracy capacitance measurement.
Background
The investment of cable quality and quantity guarantee engineering has great significance on power supply safety. If unqualified cables are adopted for circuits such as lighting, air conditioning and the like in various buildings and railway engineering, huge potential safety hazards can be buried for the engineering. Present cable trade market scale reaches the trillion level, but cable product quality is not optimistic yet, and wire and cable product disqualification rate is very high, and partial product adopts inferior copper, reclaimed copper, and to cable core line "shrink thin body", "thin in the middle of the thick at two ends", rubber layer thickness sinle silk thin etc. reduced the conductor cross-section of cable, the conductor proportion of alloy cable is not up to standard, or density inequality, cable conductor length is less than its data plate length etc..
The method for measuring the direct current resistance to calculate the resistance value of the unit length and further calculate the length of the cable conductor in the prior art has the problem that the quality problem possibly existing in the cable is difficult to find when the resistance is kept unchanged when the length of the cable conductor changes in proportion to the sectional area.
Because the conductor of the high-voltage cable is generally thicker, the length of the conductor of the cable is obtained by adopting a method for intercepting the short cable to measure the resistance in the prior art, but the resistance value of the short cable is generally very small, and the testing precision is difficult to guarantee; cutting a longer cable can result in significant waste.
SUMMERY OF THE UTILITY MODEL
To the above defect or the improvement demand of prior art, the utility model provides a cable conductor length detection device based on high accuracy capacitance measurement, its aim at provides an accurate, harmless cable capacitance detection device.
In order to realize the aim of the invention, the invention provides a cable conductor length detection device based on high-precision capacitance measurement, which comprises a constant current source, a voltage detection unit, an A/D conversion unit, a control unit, a length detection unit and an interface unit which are connected in sequence;
the constant current source is used for providing stable direct current voltage for other units of the detection device and a detected piece, the voltage detection unit is used for measuring the voltage of the detected piece, and the output of the voltage detection unit is sent to the main control unit after analog-to-digital conversion is carried out on the voltage of the detected piece through the A/D conversion unit; the main control unit and the interface unit are in an electric connection relationship; the main control unit is used for obtaining the accurate capacitance value of the tested piece according to the voltage detection value by combining a preset program; the length detection unit and the main control unit have a connection relation for signal interaction and are used for combining another preset program according to the capacitance value to obtain the length of the tested cable conductor; the accurate capacitance measured value and the length measured value of the measured piece are generated by the main control unit, display information is fed back to a user, and the interface unit is used for accessing the measured piece.
Preferably, the cable conductor length detection device based on high-precision capacitance measurement further comprises a zero clearing unit connected with the control unit and used for clearing the previous measurement data in an open circuit or short circuit state.
Preferably, in the cable conductor length detection device based on high-precision capacitance measurement, the zero clearing unit sends a status signal indicating the success of zero clearing to the control unit after the success of zero clearing; and if the zero clearing fails, sending an instruction to enable the control unit to discard the current data and exit.
Preferably, the cable conductor length detection device based on high-precision capacitance measurement further comprises a first prompting unit connected with the zero clearing unit, and the first prompting unit is used for prompting completion or failure of zero clearing after the zero clearing is completed; if the short circuit or the open circuit is unreliable when the zero clearance is cleared, the prompting unit prompts a user through an acousto-optic signal.
Preferably, the cable conductor length detection device based on high-precision capacitance measurement further comprises a second prompting unit connected with the control unit; when the measured value obtained by measurement within the set times exceeds a preset threshold value, the control unit pops up prompt information indicating that the measurement fails through the second prompt unit.
Preferably, the cable conductor length detection device based on high-precision capacitance measurement further comprises a parameter setting unit connected to the control unit, and configured to receive test parameters set by a user and send the test parameters to the control unit. Preferably, the cable conductor length detection device based on high-precision capacitance measurement further includes an automatic range adjustment unit connected to the control unit, and the automatic range adjustment unit adjusts the capacitance and the length detection range according to the received test parameters.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
the utility model provides a cable conductor length detection device based on high accuracy capacitance measurement can be harmless, the electric capacity of the measuring piece is obtained in accurate measurement, on this basis according to cable voltage grade, input long conductor's nominal length, short conductor's actual measurement length, acquires long cable conductor's actual measurement length; the method has the characteristics of portability, visual test process and result and capability of storing the data for tracing; the method has the advantages of accuracy, reliability and no damage to the length measurement of the cable conductor, and is detection equipment suitable for being applied to engineering sites.
Drawings
Fig. 1 is the utility model provides a cable conductor length detection device based on high accuracy capacitance measurement's schematic diagram.
FIG. 2 is a schematic view of a process for measuring by using the cable conductor length detection device based on high-precision capacitance measurement provided in the embodiment;
FIG. 3 is a schematic diagram illustrating the connection of the test clip during the zero clearing of the open circuit and the short circuit in the embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, the cable conductor length detection apparatus based on high-precision capacitance measurement according to the embodiment includes a constant current source, a voltage detection unit, an a/D conversion unit, a processor and an interface unit, which are connected in sequence;
the constant current source is used for providing stable direct current voltage, the voltage detection unit is used for detecting the voltage of the detected piece, the A/D conversion unit is used for performing analog-to-digital conversion, the processor is used for generating display information according to the detection result and feeding the display information back to a user, and the interface unit is used for accessing the detected piece.
In a preferred embodiment, the cable conductor length detection device based on high-precision capacitance measurement further comprises a clearing unit connected with the processor and used for clearing the previous measurement data in the open circuit and short circuit states respectively.
In a preferred embodiment, the cable conductor length detection device based on high-precision capacitance measurement further includes a prompt unit connected to the zero clearing unit, and configured to prompt completion or failure of zero clearing after the zero clearing is completed. And if the short circuit or the open circuit is unreliable when the zero clearance is cleared, the prompting unit prompts the user through a short-time signal.
In a preferred embodiment, the prompting unit is further connected with the processor, and does not store the current data and exits when the zero clearing fails.
In the cable conductor length detection device based on high-precision capacitance measurement provided by a preferred embodiment, the device further comprises a calculation unit, a signal processing unit and a signal processing unit, wherein the calculation unit is used for calculating and obtaining the test length of the cable according to the measured capacitance by adopting a built-in algorithm;
in one embodiment, capacitance C of a long cable is measured1(pF) measuring the intercepted portion of the cable capacitance C2(pF) and its length L2(m); according to the conductor cross section, the cable voltage and the nominal length L of the long conductor0(m) looking up the table to obtain the correction value C of the intercepted cable capacitance boundaryX(pF); the calculation unit calculates and obtains the actual measurement length L of the long cable1(m)；
Referring to fig. 2, the process of measuring the length of the conductor of the cable using the cable conductor length detection device based on high-precision capacitance measurement provided by the embodiment is as follows.
After starting up, starting up the system within a preset time length; the initialization is completed after the built-in capacitance measuring unit for realizing capacitance measurement is started for several seconds, and the parameters of the initial state are set as follows:
frequency: 1 kHz; level: 1.0V; displaying: direct reading; measuring range: automatic; speed: slow speed; clearing: opening a circuit; a function; a signal sound switch: closing; trigger switch (measurement mode): off (continuous measurement); the equivalent mode is as follows: are connected in series; serial port: off-accept only; a separation mode: sorting qualified third grade; signal source internal resistance: 30 omega; keyboard state locking switch: off-unlocked.
After initialization, the capacitance measuring equipment can work normally, and the initialization state meets the detection requirement; the parameters involved in the measurement can also be set and changed through a human-computer interaction interface.
Preheating is the action of the whole set of equipment, in one example, the equipment is preheated for 10 minutes after being started, and relevant test operation is not carried out within 10 minutes; after preheating, a button on a man-machine interaction screen can be clicked to enter a main control interface. And clicking the capacitance measuring unit on the main control interface to measure the capacitance of the accessed tested piece.
The measurement unit is provided with an initialization interface, and the test parameter setting can be manually modified through a man-machine interaction interface screen; the device is opened in the default state of sending the serial port, and the measuring mode is set to single measurement, namely, one value is measured only by triggering. The initialization is started by setting a completion point, and the completion (or failure) of the initialization is prompted after the initialization is successful.
The human-computer interaction interface is provided with a zero clearing inlet and can be set to be open-circuit zero clearing or short-circuit zero clearing; after the setting is finished, the interface displays a test clip arrangement demonstration picture sent by the main control unit, referring to fig. 3, a tester can reasonably arrange test clips or short circuit pieces according to the demonstration picture, and when the open circuit is cleared, the two test clips are accurately opened; short tabs are used when the short circuit clears. Clicking to clear, and prompting that clearing is completed (or fails) after completion.
If the short circuit or the open circuit is seriously unreliable during zero clearing, a prompt alarm module of the device can send out a short-time sound (even if the sound is closed in function setting), and the zero-cleared data cannot be stored and quit. The cleared internal related data is still stored after the power of the equipment is cut off, so that if the test condition is not changed, the reset is not needed after the equipment is started again.
Clicking a measurement key on a measurement unit interface of a human-computer interaction interface can pop a prompt of clamping a black test clip on a conductor and clamping a red test clip on a shielding layer; with reference to figure 3 of the drawings,
the instrument has an automatic range adjustment function, 5s is waited after clicking is determined, 1 measurement value is taken every 1s, the value of the last 2 values does not exceed 1% relative to the value of the first value, the effective measurement value is obtained, and the 3 values are averaged to be used as the measurement value; otherwise, measuring 3 values again, continuously failing for three times, judging that the measurement fails, and popping up a prompt of 'measurement fails, please check wiring' on the human-computer interaction interface. And if the measurement is successful, popping up a prompt of 'measurement success' and displaying the measured value. Clicking to save the measured value or abandoning to save the measured value; to prevent a malfunction, in one example, it is arranged that a re-confirmation is required to abort the store retirement.
Because high tension cable has shielding layer, and the thickness of insulating layer is comparatively even, adopts the utility model provides a cable conductor length detection device based on high accuracy capacitance measurement measures the cable electric capacity that obtains the high accuracy earlier, and then obtains the length of cable in view of the above, is a be convenient for use at the on-the-spot harmless, reliable check out test set of engineering.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A cable conductor length detection device based on high-precision capacitance measurement is characterized by comprising a constant current source, a voltage detection unit, an A/D conversion unit, a control unit, a length detection unit and an interface unit which are sequentially connected;
the constant current source is used for providing stable direct current voltage for other units of the detection device and a detected piece, the voltage detection unit is used for measuring the voltage of the detected piece, and the output of the voltage detection unit is sent to the main control unit after analog-to-digital conversion is carried out on the output of the voltage detection unit through the A/D conversion unit; the main control unit is electrically connected with the interface unit and is used for obtaining the capacitance value of the tested piece according to the voltage detection value by combining a preset program; the length detection unit and the main control unit have a connection relation for signal interaction and are used for combining another preset program according to the capacitance value to obtain the length of the conductor of the tested cable; the accurate capacitance measured value and the length measured value of the measured piece are generated by the main control unit, and display information is fed back to a user; the interface unit is used for accessing the tested piece.
2. The cable conductor length detection device based on high-precision capacitance measurement according to claim 1, further comprising a zero clearing unit connected with the control unit and used for clearing the previous measurement data in an open circuit and short circuit state.
3. The cable conductor length detection device based on high-precision capacitance measurement as claimed in claim 1 or 2, wherein the zero clearing unit sends a status signal indicating the success of zero clearing to the control unit after the success of zero clearing; and if the zero clearing fails, sending an instruction to enable the control unit to discard the current data and exit.
4. The cable conductor length detection device based on high-precision capacitance measurement as recited in claim 3, further comprising a first prompting unit connected to the zero clearing unit for prompting completion or failure of zero clearing after completion of zero clearing; if the short circuit or the open circuit is unreliable when the zero clearance is cleared, the prompting unit prompts a user through an acousto-optic signal.
5. The high-precision capacitance measurement-based cable conductor length detection device as claimed in claim 4, further comprising a second prompting unit connected with the control unit; when the measured value obtained by measurement within the set times exceeds a preset threshold value, the control unit pops up prompt information indicating that the measurement fails through the second prompt unit.
6. The cable conductor length detection device based on high-precision capacitance measurement according to claim 1 or 2, further comprising a parameter setting unit connected with the control unit and used for receiving test parameters set by a user and sending the test parameters to the control unit.
7. The cable conductor length detection device based on high-precision capacitance measurement according to claim 1 or 2, further comprising an automatic range adjustment unit connected with the control unit, wherein the automatic range adjustment unit adjusts the capacitance and the length detection range according to the received test parameters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921899558.2U CN210603166U (en) | 2019-11-05 | 2019-11-05 | Cable conductor length detection device based on high-precision capacitance measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921899558.2U CN210603166U (en) | 2019-11-05 | 2019-11-05 | Cable conductor length detection device based on high-precision capacitance measurement |
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| Publication Number | Publication Date |
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| CN210603166U true CN210603166U (en) | 2020-05-22 |
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| CN201921899558.2U Active CN210603166U (en) | 2019-11-05 | 2019-11-05 | Cable conductor length detection device based on high-precision capacitance measurement |
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