CN219143068U - Secondary cable electrified core testing device - Google Patents
Secondary cable electrified core testing device Download PDFInfo
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- CN219143068U CN219143068U CN202223133827.9U CN202223133827U CN219143068U CN 219143068 U CN219143068 U CN 219143068U CN 202223133827 U CN202223133827 U CN 202223133827U CN 219143068 U CN219143068 U CN 219143068U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
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Abstract
The utility model provides a secondary cable electrified core testing device which comprises a first measuring unit, a second measuring unit, a detecting unit, a control unit and a display unit, wherein one end of the first measuring unit and one end of the second measuring unit are respectively used for contacting and measuring two ends of a cable to be tested, the other end of the second measuring unit is grounded, the other end of the first measuring unit is connected with the detecting unit, the detecting unit is connected with the control unit, and the control unit is connected with the display unit. According to the utility model, the built-in resistor and the equivalent capacitance of the cable form the RC loop of the oscillator, the output frequency of the oscillator is changed due to the change of the capacitance value in the RC loop, and the core alignment detection is carried out by detecting the change of the output frequency of the oscillator, so that the core alignment test of the two-test cable under the condition of no power failure is realized, and the device has the advantages of simple structure and convenience in use.
Description
Technical Field
The utility model relates to the field of power grids, in particular to a secondary cable live core testing device.
Background
And the relay protection of the transformer substation and signals of control, remote signaling, measurement and the like transmitted by an automatic system are transmitted by a secondary cable. And determining that the core wires of the secondary cable are correctly wired, short-circuited loops and the like are the preconditions of normal operation. Conventional core alignment test methods (such as resistance bar alignment of a multimeter) must be performed on the premise that the secondary cable is not electrified and both ends of the cable are untwisted, and such methods are difficult to perform under the condition that the field condition is unknown and the power failure condition is not provided, and in the maintenance and defect elimination work of the daily secondary system, the secondary system is in an operation state, and the secondary cable is in an electrified state, for example: the cable insulation of the control loop is reduced, the cable is required to be replaced, the secondary alternating current sampling module is required to be replaced, the secondary winding of the current transformer is required to be replaced and the secondary cable is required to be subjected to wire disconnection, wiring and short circuit work, the cable core wire is extremely important to be accurately determined, and the wrong wiring or short circuit of the secondary cable can cause serious consequences such as protection misoperation, protection refusal, primary equipment burnout of the current transformer and the like.
With the conventional core alignment method, the condition of no power of the cable needs to be met, and the secondary cable needs to be stopped by matching with primary equipment, so that the power supply reliability and the customer satisfaction degree are seriously affected, and the actual requirement cannot be met by the conventional core alignment detection mode.
Disclosure of Invention
In order to solve the problems in the background technology, the utility model provides a secondary cable electrified core testing device.
The utility model provides a secondary cable electrified core testing arrangement, includes first measuring element, second measuring element, detecting element, control unit and display element, the one end of first measuring element with the one end of second measuring element is used for the contact respectively to measure the both ends of cable that awaits measuring, the other end ground connection of second measuring element, the other end of first measuring element is connected detecting element, detecting element connects control unit, control unit connects display element.
Based on the above, the first measuring unit includes a first probe and a built-in resistor, one end of the first probe is used for contacting and measuring one end of the cable to be measured, and the other end of the first probe is connected with the detecting unit through the built-in resistor.
Based on the above, the second measurement unit includes a second probe and a Y capacitor, one end of the second probe is used for contacting and measuring the other end of the cable to be measured, and the other end of the second probe is grounded through the Y capacitor.
Based on the above, the control unit is an MCU controller, and the display unit is an LCD display screen.
Based on the above, the detection unit is a counting frequency division chip, and the model is CD4060BE.
Compared with the prior art, the utility model has substantial characteristics and progress, in particular, the utility model forms the RC loop of the oscillator by the built-in resistor and the equivalent capacitance of the cable, the change of the capacitance value in the RC loop can change the output frequency of the oscillator, and the core detection is carried out by detecting the change of the output frequency of the oscillator, so that the core detection of the two-measurement cable under the condition of no power failure is realized, and the utility model has the advantages of simple structure and convenient use.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without any inventive effort, are intended to be within the scope of the utility model.
The utility model provides a secondary cable electrified core testing arrangement, includes first measuring element, second measuring element, detecting element, control unit and display element, the one end of first measuring element with the one end of second measuring element is used for the contact respectively to measure the both ends of cable that awaits measuring, the other end ground connection of second measuring element, the other end of first measuring element is connected detecting element, detecting element connects control unit, control unit connects display element.
When the device is used, the first measuring unit and the second measuring unit are respectively used for contacting and measuring two ends of a cable to be measured, the detecting unit is used for detecting the change of the oscillation frequency, and the control unit displays the measuring result through the display unit, so that the core detection of the cable is realized.
Specifically, as shown in fig. 1, the detection unit is a counting frequency-dividing chip, the model is CD4060BE, and the detection unit itself includes an oscillator and a counter, the 10 pin of the oscillator is connected to the ohmic resistor R3, and the 9 pin of the oscillator is connected to the capacitor C1, when the oscillator has a certain oscillation frequency f output, that is, when the detection is not performed, the oscillator also has a certain oscillation frequency output. The first measuring unit comprises a first probe TZ1 and built-in resistors R3 and R4, wherein the resistor R4 is a variable resistor and is used for actually adjusting the resistance value of the RC circuit, one end of the first probe TZ1 is used for contacting and measuring one end of a cable to be measured, and the other end of the first probe TZ1 is connected with the detecting unit through the built-in resistor. The second measuring unit comprises a second probe TZ2 and a Y capacitor C3, one end of the second probe TZ2 is used for contacting and measuring the other end of the cable to be measured, and the other end of the second probe TZ2 is grounded through the Y capacitor C3. The distributed capacitance Cx of the secondary power cable is basically constant with the equivalent capacitance Cx formed by the capacitance value to the ground (the equivalent capacitance is related to the cable length, namely the length of each cable inner wire core is basically the same, the equivalent capacitance of each corresponding wire core is unchanged during detection), the built-in resistance of the detection device and the equivalent capacitance Cx of the cable to BE detected form an oscillator RC loop, the change of the capacitance C value in the RC loop can change the oscillator output frequency f of a chip CD4060BE, the other end of the cable is connected with a voltage-resistant Y capacitor C3 in series, the change of the capacitance value in the RC loop can change the oscillation frequency f, the change of the corresponding frequency can BE detected through a frequency counter of the CD4060BE chip, and the live core test of the cable can BE completed according to the change of the oscillation frequency. In this embodiment, the display unit is an LCD display screen, the control unit U1 is an MCU controller, and is actually a 52-series single-chip microcomputer, and configured to connect with the LCD display screen and display the detected frequency value through the LCD display screen; in fig. 1, K is a switch, and is used as a power switch.
The inherent property of the capacitor of isolating the direct current from the direct current and alternating current enables the method of connecting the direct current cable to the core without power outage to be feasible, and even if the direct current cable is in live operation, the capacitor is used for connecting the direct current cable to the ground, the cable is not short-circuited, and the operation of the cable is not affected. In order to meet the safety requirement of higher voltage (-110V- +110V) and meet the purpose that the capacitor cannot cause electric shock and cannot endanger personal safety, the second probe in the embodiment is connected with the Y capacitor in the safety capacitor, and the Y capacitor is connected between two lines of the power line and the ground in a bridging way and has the characteristics of high voltage resistance and failure and cannot cause electric shock danger. Therefore, direct current can be isolated, and the purpose of direct current cable in live contact operation is achieved.
When the cable is specifically used, the first probe TZ1 contacts one end of the cable, the other end of the cable is repeatedly contacted and disconnected with the second probe TZ2 grounded through the voltage-resistant Y capacitor C3, if the cable is contacted with the same wire core, the frequency is changed due to the existence of the equivalent capacitor, the display screen outputs a frequency value after the change, if the cable is contacted with the other wire core, the second probe does not change when the cable is contacted or disconnected due to the existence of the equivalent capacitor, and the display screen outputs a fixed frequency value.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (5)
1. The utility model provides a secondary cable electrified core testing arrangement which characterized in that: the device comprises a first measuring unit, a second measuring unit, a detecting unit, a control unit and a display unit, wherein one end of the first measuring unit and one end of the second measuring unit are respectively used for contacting and measuring two ends of a cable to be measured, the other end of the second measuring unit is grounded, the other end of the first measuring unit is connected with the detecting unit, the detecting unit is connected with the control unit, and the control unit is connected with the display unit.
2. The secondary cable live core testing apparatus of claim 1 wherein: the first measuring unit comprises a first probe and a built-in resistor, one end of the first probe is used for contacting and measuring one end of a cable to be measured, and the other end of the first probe is connected with the detecting unit through the built-in resistor.
3. The secondary cable live core testing apparatus of claim 1 wherein: the second measuring unit comprises a second probe and a Y capacitor, one end of the second probe is used for contacting and measuring the other end of the cable to be measured, and the other end of the second probe is grounded through the Y capacitor.
4. The secondary cable live core testing apparatus of claim 1 wherein: the control unit is an MCU controller, and the display unit is an LCD display screen.
5. The secondary cable live core testing apparatus of claim 1 wherein: the detection unit is a counting frequency division chip, and the model is CD4060BE.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223133827.9U CN219143068U (en) | 2022-11-25 | 2022-11-25 | Secondary cable electrified core testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223133827.9U CN219143068U (en) | 2022-11-25 | 2022-11-25 | Secondary cable electrified core testing device |
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| Publication Number | Publication Date |
|---|---|
| CN219143068U true CN219143068U (en) | 2023-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223133827.9U Active CN219143068U (en) | 2022-11-25 | 2022-11-25 | Secondary cable electrified core testing device |
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| Country | Link |
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| CN (1) | CN219143068U (en) |
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2022
- 2022-11-25 CN CN202223133827.9U patent/CN219143068U/en active Active
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