CN112666502A - Hand-held type CT polarity tester device - Google Patents
Hand-held type CT polarity tester device Download PDFInfo
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- CN112666502A CN112666502A CN202011393753.5A CN202011393753A CN112666502A CN 112666502 A CN112666502 A CN 112666502A CN 202011393753 A CN202011393753 A CN 202011393753A CN 112666502 A CN112666502 A CN 112666502A
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Abstract
The invention provides a hand-held CT polarity tester device, which comprises a power supply module, a CPU module, a current acquisition processing module and a display module, wherein the CPU module is connected with the power supply module; the input end of the current acquisition processing module is provided with a connector, and the connector is inserted into a circuit to be sampled to sample the polarity of the CT; the output end of the current acquisition processing module is electrically connected with the input end of the CPU module; the output end of the CPU module is electrically connected with the input end of the display module; and the power supply module supplies power to the CPU module, the current acquisition and processing module and the display module. The CT polarity tester device provided by the invention has small volume and is easy to carry, and can carry out multi-winding test by one key, thereby improving the working quality and efficiency of CT polarity test, improving the man-machine work efficiency, preventing artificial missing judgment and erroneous judgment during CT polarity test, and ensuring the correct wiring polarity of a CT secondary circuit and the safe and reliable operation of an electric power system.
Description
Technical Field
The invention relates to the technical field of power system relay protection, in particular to a handheld CT polarity tester device.
Background
The primary voltage of the power system is very high, the Current is very large, instruments and meters for measuring and controlling the primary system and a protection device cannot be directly connected to the primary system, and the large Current of the primary system needs to be isolated by using a Current Transformer (CT), so that secondary relay protection, an automatic device and a measuring instrument can safely and accurately acquire primary loop Current information. The polarity of the CT is a relationship between the current directions of the primary winding and the secondary winding, and if the polarity of the secondary wiring is wrong, the secondary equipment cannot correctly obtain the primary current information, so that the protection device related to the direction is rejected or mistakenly operated, and the safe and stable operation of the power system is influenced.
When CT secondary circuit wiring is involved in the capital construction and technical improvement projects of the transformer substation, polarity test needs to be carried out on the CT secondary circuit wiring to ensure that the current direction entering the instrument is consistent with the design requirement. The CT polarity tester on the market is extremely heavy and inconvenient to carry, field technicians generally adopt a method of matching a dry battery with a direct current milliammeter to test the polarity of the secondary wiring of the CT, for example, a secondary wiring homopolarity detector disclosed in 2013, 10, month and 16 of Chinese utility model with the publication number of CN 203241501U. The method mainly has the following defects: firstly, at least two persons are needed to cooperate, and only one winding can be tested each time; secondly, testing personnel need to constantly observe the deflection direction of the pointer of the direct current milliammeter, a test result has no self-holding function, the man-machine effect is poor, and the judgment is easy to miss; when the applied primary side direct current is small, the deflection of the secondary side direct current milliammeter pointer is not obvious, and misjudgment is easy; when the applied primary side direct current is larger, the deflection of the secondary side direct current milliammeter pointer may exceed the measuring range, and the pointer is damaged.
Disclosure of Invention
The invention provides a handheld CT polarity tester device, aiming at overcoming the technical defects that the existing CT secondary wiring polarity tester is inconvenient to carry, cannot be operated by a single person and has high misjudgment and misjudgment ratio.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a hand-held CT polarity tester device comprises an insulating shell, a power supply module, a CPU module, a current acquisition processing module and a display module; wherein:
the power supply module, the CPU module, the current acquisition processing module, the display module and the current signal sampling line are all packaged in the insulating shell;
the input end of the current acquisition processing module is provided with a connector, and the connector is inserted into a circuit to be sampled to sample the polarity of the CT;
the output end of the current acquisition processing module is electrically connected with the input end of the CPU module;
the output end of the CPU module is electrically connected with the input end of the display module;
the power supply module supplies power to the CPU module, the current acquisition and processing module and the display module.
In the scheme, the invention provides a handheld CT polarity tester device which is small in size, easy to carry, capable of carrying out multi-winding testing by one key, convenient and quick to use, effectively solves the problems of large size, heavy weight and difficulty in carrying of a traditional CT polarity tester, simultaneously solves the problems of automatic one-key synchronous testing and accuracy of CT secondary side multi-winding polarity, improves the working quality and efficiency of CT polarity testing, improves the human-computer work efficiency, prevents artificial missing judgment and erroneous judgment during CT polarity testing, and ensures the correct wiring polarity of a CT secondary circuit and the safe and reliable operation of an electric power system.
The power supply module comprises a charging interface, a voltage stabilizing module, a lithium battery pack, a charging module, a discharge generator and an output circuit; wherein:
the charging interface is arranged on the insulating shell and is electrically connected with the input end of the voltage stabilizing module;
the output end of the voltage stabilizing module is electrically connected with the input end of the charging module;
the output end of the charging module is electrically connected with the charging end of the lithium battery pack;
the output end of the lithium battery pack is electrically connected with the input end of the discharge generator;
the output end of the discharge generator is electrically connected with the output circuit and the CPU module, and supplies power to the current acquisition and processing module, the CPU module and the display module.
The tester device monitors the electric quantity of the lithium battery pack in real time after being started and displays the electric quantity on the display module.
In the scheme, the charging interface is connected with an external alternating current power supply AC220V to charge the lithium battery pack; the direct current output circuit of the power module mainly outputs two paths of direct current power supplies, the first path is used for providing power for electronic components in the device, the power switch of the device controls the output of the first path, when the power switch is switched on, voltage DC3.7V is output to supply power for the internal electronic components, when the power switch is switched off, no output voltage exists, and the internal electronic components are powered off; the second output power supply is used as an input power supply of the primary side of the current transformer, the output of the second output power supply is controlled by a test button of the device, the voltage DC5V is output after the test button is pressed, and after the test button is rebounded and reset, an output loop is disconnected, and the voltage of a port disappears.
In the scheme, the second output power port of the power module adopts a double-hole design, and the output port of the color distinguishing device is used for outputting positive and negative electrodes, red is a positive electrode, and black is a negative electrode; the matched external input line also adopts red and black colors to distinguish the DC output polarity to ensure that the test wiring polarity is correct.
The current acquisition processing module comprises a current sampling module, an amplifier, a shaping module, a phase discrimination synchronization module, a level conversion module and a data selector; wherein:
the input end of the current sampling module is provided with a connector, and the connector is inserted into a circuit to be sampled to sample the CT polarity;
the output end of the current sampling module is electrically connected with the input end of the amplifier;
the output end of the amplifier is electrically connected with the input end of the shaping module;
the output end of the shaping module is electrically connected with the input end of the phase discrimination synchronization module;
the output end of the phase discrimination synchronization module is electrically connected with the input end of the level conversion module;
the output end of the level conversion module is electrically connected with the input end of the data selector;
the output end of the data selector is electrically connected with the input end of the CPU module.
In the above scheme, the current acquisition processing module can keep the current pulse information, and if the current pulse information needs to be clear, the test button needs to be pressed again or the power is turned off and restarted.
The current sampling module simultaneously collects multiple paths of input current pulses to carry out polarity test and compare the polarity results of the CT secondary circuit; the input end of the current sampling module adopts a single-hole design to realize pulse current collection, and the side plug of the current signal sampling line device matched with the current sampling module adopts a circular plug design to be matched with the input port of the current sampling module.
The CPU module is used for processing the polarity relation between the current pulse input from the data selector and the output voltage, and is positive when the detected input pulse current is a rising edge pulse, and is reverse when the detected input pulse current is a falling edge pulse; and the detection result is displayed through the display module.
The CPU module is provided with a test button, and the test button is electrically connected with the CPU module; the CPU module performs polarity test on the input pulse current and completes a test result when the test button is pressed, and the CPU module does not perform test and result output even if the pulse current is detected when the test button is not pressed.
The CT polarity tester device further comprises a storage module, and the storage module is electrically connected with the CPU module to achieve information interaction. The storage module is used for storing the polarity test records processed by the CPU module, more than 200 records can be stored, and the requirement of the storage capacity of the polarity test of the transformer substation is met; if the test record exceeds the storage capacity, the oldest record will be automatically overwritten.
The display module adopts a liquid crystal display module; the liquid crystal display module is electrically connected with the CPU module through a serial port line and used for displaying an output polarity test result and the electric quantity of the power supply module and browsing historical test records.
In the scheme, the last polarity test result and time are displayed after the liquid crystal display module is started, a new test result is obtained and immediately displayed after the test button is pressed, and the test result is continuously updated after the test button is pressed again.
In the scheme, the invention adopts a multi-input synchronous sampling technology to realize the automatic one-key synchronous testing of the polarity of the secondary side multi-winding of the CT; by adopting the misplug prevention design, the grouping marking and the color separation distinguishing, the situation that the test result is wrong due to the wrong wiring is prevented; the self-holding technology and the recording and storing function are adopted, so that the field recording time is reduced; the current pulse amplification technology is adopted, so that accurate measurement in the case of small current is ensured; the built-in lithium battery is used as a working power supply to ensure that the device can still work independently after being separated from an alternating current power supply.
In the scheme, the invention can realize the one-key automatic synchronous test function and the one-man operation function of the CT polarity test operation, improve the working quality and efficiency of the CT polarity test, improve the man-machine work efficiency, prevent the occurrence of artificial missing judgment and erroneous judgment during the CT polarity test, and ensure the correct wiring polarity of the CT secondary circuit and the safe and reliable operation of the power system.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention provides a hand-held CT polarity tester device which is small in size, easy to carry, capable of carrying out multi-winding testing by one key, convenient and quick to use, effectively solves the problems of large size, heavy weight and difficulty in carrying of a traditional CT polarity tester, simultaneously solves the problems of automatic one-key synchronous testing and accuracy of CT secondary side multi-winding polarity, improves the working quality and efficiency of CT polarity testing, improves the man-machine working efficiency, prevents artificial missing judgment and erroneous judgment during CT polarity testing, and ensures the correct wiring polarity of a CT secondary circuit and the safe and reliable operation of an electric power system.
Drawings
FIG. 1 is a schematic structural diagram of a CT polarity tester;
fig. 2 is a schematic diagram of an internal circuit of the CT polarity tester apparatus.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1, a hand-held CT polarity tester apparatus includes an insulating housing, a power module, a CPU module, a current collection processing module, and a display module; wherein:
the power supply module, the CPU module, the current acquisition processing module, the display module and the current signal sampling line are all packaged in the insulating shell;
the input end of the current acquisition processing module is provided with a connector, and the connector is inserted into a circuit to be sampled to sample the polarity of the CT;
the output end of the current acquisition processing module is electrically connected with the input end of the CPU module;
the output end of the CPU module is electrically connected with the input end of the display module;
the power supply module supplies power to the CPU module, the current acquisition and processing module and the display module.
In the specific implementation process, the invention provides a handheld CT polarity tester device which is small in size, easy to carry, capable of carrying out multi-winding testing by one key, convenient and quick to use, effectively solves the problems of large size, heavy weight and difficulty in carrying of a traditional CT polarity tester, also solves the problems of automatic one-key synchronous testing and accuracy of CT secondary side multi-winding polarity, improves the working quality and efficiency of CT polarity testing, improves the man-machine efficiency, prevents artificial missing judgment and erroneous judgment during CT polarity testing, and ensures the correct wiring polarity of a CT secondary circuit and the safe and reliable operation of an electric power system.
Example 2
More specifically, as shown in fig. 2, the power module includes a charging interface, a voltage stabilizing module, a lithium battery pack, a charging module, a discharge generator, and an output circuit; wherein:
the charging interface is arranged on the insulating shell and is electrically connected with the input end of the voltage stabilizing module;
the output end of the voltage stabilizing module is electrically connected with the input end of the charging module;
the output end of the charging module is electrically connected with the charging end of the lithium battery pack;
the output end of the lithium battery pack is electrically connected with the input end of the discharge generator;
the output end of the discharge generator is electrically connected with the output circuit and the CPU module, and supplies power to the current acquisition and processing module, the CPU module and the display module.
More specifically, an electric quantity detection loop is arranged on the lithium battery pack, and the electric quantity of the lithium battery pack is monitored in real time and displayed on the display module after the tester device is started.
In a specific implementation process, the charging interface charges the lithium battery pack by connecting an external alternating current power supply AC 220V; the direct current output circuit of the power module mainly outputs two paths of direct current power supplies, the first path is used for providing power for electronic components in the device, the power switch of the device controls the output of the first path, when the power switch is switched on, voltage DC3.7V is output to supply power for the internal electronic components, when the power switch is switched off, no output voltage exists, and the internal electronic components are powered off; the second output power supply is used as an input power supply of the primary side of the current transformer, the output of the second output power supply is controlled by a test button of the device, the voltage DC5V is output after the test button is pressed, and after the test button is rebounded and reset, an output loop is disconnected, and the voltage of a port disappears.
In the specific implementation process, the second output power port of the power module adopts a double-hole design, the output port of the color distinguishing device is used for outputting positive and negative electrodes, red is a positive electrode, and black is a negative electrode; the matched external input line also adopts red and black colors to distinguish the DC output polarity to ensure that the test wiring polarity is correct.
More specifically, the current acquisition processing module comprises a current sampling module, an amplifier, a shaping module, a phase discrimination synchronization module, a level conversion module and a data selector; wherein:
the input end of the current sampling module is provided with a connector, and the connector is inserted into a circuit to be sampled to sample the CT polarity;
the output end of the current sampling module is electrically connected with the input end of the amplifier;
the output end of the amplifier is electrically connected with the input end of the shaping module;
the output end of the shaping module is electrically connected with the input end of the phase discrimination synchronization module;
the output end of the phase discrimination synchronization module is electrically connected with the input end of the level conversion module;
the output end of the level conversion module is electrically connected with the input end of the data selector;
the output end of the data selector is electrically connected with the input end of the CPU module.
In a specific implementation process, the current acquisition processing module can keep current pulse information, and if the current pulse information needs to be clear, a test button needs to be pressed again or the power supply needs to be turned off and restarted.
More specifically, the current sampling module simultaneously collects multiple paths of input current pulses to perform polarity test and compare the polarity results of the CT secondary circuit; the input end of the current sampling module adopts a single-hole design to realize pulse current collection, and the side plug of the current signal sampling line device matched with the current sampling module adopts a circular plug design to be matched with the input port of the current sampling module.
More specifically, the CPU module is configured to process a polarity relationship between the current pulse input from the data selector and the output voltage, and is configured to be positive when the detected input pulse current is a rising edge pulse, and to be reverse when the detected input pulse current is a falling edge pulse; and the detection result is displayed through the display module.
More specifically, the CPU module is provided with a test button, and the test button is electrically connected with the CPU module; the CPU module performs polarity test on the input pulse current and completes a test result when the test button is pressed, and the CPU module does not perform test and result output even if the pulse current is detected when the test button is not pressed.
More specifically, the CT polarity tester apparatus further includes a storage module electrically connected to the CPU module to implement information interaction. The storage module is used for storing the polarity test records processed by the CPU module, more than 200 records can be stored, and the requirement of the storage capacity of the polarity test of the transformer substation is met; if the test record exceeds the storage capacity, the oldest record will be automatically overwritten.
More specifically, the display module adopts a liquid crystal display module; the liquid crystal display module is electrically connected with the CPU module through a serial port line and used for displaying an output polarity test result and the electric quantity of the power supply module and browsing historical test records.
In the specific implementation process, the last polarity test result and time are displayed after the liquid crystal display module is started, a new test result is obtained and immediately displayed after the test button is pressed, and the test result is continuously updated after the test button is pressed again.
In the specific implementation process, the invention adopts a multi-input synchronous sampling technology to realize the automatic one-key synchronous testing of the polarity of the secondary side multi-winding of the CT; by adopting the misplug prevention design, the grouping marking and the color separation distinguishing, the situation that the test result is wrong due to the wrong wiring is prevented; the self-holding technology and the recording and storing function are adopted, so that the field recording time is reduced; the current pulse amplification technology is adopted, so that accurate measurement in the case of small current is ensured; the built-in lithium battery is used as a working power supply to ensure that the device can still work independently after being separated from an alternating current power supply.
In the specific implementation process, the invention can realize the one-key automatic synchronous testing function and the one-man operation function of the CT polarity testing operation, improve the working quality and efficiency of the CT polarity test, improve the man-machine work efficiency, prevent the occurrence of artificial missing judgment and erroneous judgment during the CT polarity test, and ensure the correct wiring polarity of the CT secondary circuit and the safe and reliable operation of an electric power system.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A hand-held CT polarity tester device is characterized by comprising an insulating shell, a power supply module, a CPU module, a current acquisition processing module and a display module; wherein:
the power supply module, the CPU module, the current acquisition processing module, the display module and the current signal sampling line are all packaged in the insulating shell;
the input end of the current acquisition processing module is provided with a connector, and the connector is inserted into a circuit to be sampled to sample the polarity of the CT;
the output end of the current acquisition processing module is electrically connected with the input end of the CPU module;
the output end of the CPU module is electrically connected with the input end of the display module;
the power supply module supplies power to the CPU module, the current acquisition and processing module and the display module.
2. The hand-held CT polarity tester device of claim 1, wherein said power module comprises a charging interface, a voltage stabilization module, a lithium battery pack, a charging module, a discharge generator and an output circuit; wherein:
the charging interface is arranged on the insulating shell and is electrically connected with the input end of the voltage stabilizing module;
the output end of the voltage stabilizing module is electrically connected with the input end of the charging module;
the output end of the charging module is electrically connected with the charging end of the lithium battery pack;
the output end of the lithium battery pack is electrically connected with the input end of the discharge generator;
the output end of the discharge generator is electrically connected with the output circuit and the CPU module, and supplies power to the current acquisition and processing module, the CPU module and the display module.
3. The hand-held CT polarity tester device of claim 2, wherein a power detection circuit is disposed on the lithium battery pack, and the tester device monitors the power of the lithium battery pack in real time after being turned on and displays the power on the display module.
4. The hand-held CT polarity tester device of claim 1, wherein said current collection processing module comprises a current sampling module, an amplifier, a shaping module, a phase discrimination synchronization module, a level conversion module and a data selector; wherein:
the input end of the current sampling module is provided with a connector, and the connector is inserted into a circuit to be sampled to sample the CT polarity;
the output end of the current sampling module is electrically connected with the input end of the amplifier;
the output end of the amplifier is electrically connected with the input end of the shaping module;
the output end of the shaping module is electrically connected with the input end of the phase discrimination synchronization module;
the output end of the phase discrimination synchronization module is electrically connected with the input end of the level conversion module;
the output end of the level conversion module is electrically connected with the input end of the data selector;
the output end of the data selector is electrically connected with the input end of the CPU module.
5. The hand-held CT polarity tester device of claim 4, wherein the current sampling module simultaneously collects multiple input current pulses to perform polarity test and compare the polarity results of the secondary CT loop.
6. The hand-held CT polarity tester device of claim 4, wherein said CPU module is configured to process the polarity relationship between the input current pulses and the output voltage from said data selector, wherein the detected input pulse current is positive polarity when the detected input pulse current is a rising edge pulse, and is reverse polarity when the detected input pulse current is a falling edge pulse; and the detection result is displayed through the display module.
7. The hand-held CT polarity tester device of claim 6, wherein a test button is disposed on the CPU module, and the test button is electrically connected to the CPU module; the CPU module performs polarity test on the input pulse current and completes a test result when the test button is pressed, and the CPU module does not perform test and result output even if the pulse current is detected when the test button is not pressed.
8. The hand-held CT polarity tester device of any one of claims 1-7, further comprising a memory module, wherein the memory module is electrically connected with the CPU module to realize information interaction.
9. The hand-held CT polarity tester device of claim 8, wherein said storage module is used for storing the polarity test record processed by said CPU module; if the test record exceeds the storage capacity, the oldest record will be automatically overwritten.
10. The hand-held CT polarity tester device of claim 9, wherein said display module is a liquid crystal display module; the liquid crystal display module is electrically connected with the CPU module through a serial port line and used for displaying an output polarity test result and the electric quantity of the power supply module and browsing historical test records.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011393753.5A CN112666502A (en) | 2020-12-03 | 2020-12-03 | Hand-held type CT polarity tester device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011393753.5A CN112666502A (en) | 2020-12-03 | 2020-12-03 | Hand-held type CT polarity tester device |
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Application publication date: 20210416 |
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| RJ01 | Rejection of invention patent application after publication |