CN113030834A - Transformer secondary circuit line calibration device and method - Google Patents
Transformer secondary circuit line calibration device and method Download PDFInfo
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- CN113030834A CN113030834A CN202110418250.7A CN202110418250A CN113030834A CN 113030834 A CN113030834 A CN 113030834A CN 202110418250 A CN202110418250 A CN 202110418250A CN 113030834 A CN113030834 A CN 113030834A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The application discloses a mutual inductor secondary circuit line calibration device and method, and relates to the technical field of power equipment. A line calibration device for a secondary circuit of a mutual inductor comprises a constant current source, a Kelvin wire clamp group, a direct current millivoltmeter, a comparison unit, a display unit and an alarm unit, wherein the constant current source is used for providing preset direct current; the Kelvin wire clamp group is connected with the constant current source to form a first loop, and the Kelvin wire clamp group is connected with a preset terminal bus core and a grounding grid of the mutual inductor; the direct-current millivoltmeter is connected to the first loop to detect a first voltage generated when the preset terminal row wire core and a secondary winding wiring terminal of a mutual inductor corresponding to the preset terminal row wire core are connected to the first loop; the comparison unit is connected with the direct-current millivoltmeter to compare the first voltage with a preset voltage; the display unit is connected with the comparison unit, and displays a first resistor corresponding to the first voltage when the first voltage is less than the preset voltage; the alarm unit is connected with the comparison unit, and alarms when the first voltage is smaller than the preset voltage.
Description
Technical Field
The application relates to the technical field of power equipment, in particular to a mutual inductor secondary circuit line calibration device and method.
Background
The mutual inductor is necessary switching equipment in power engineering, is connected between a general power supply line and a main control room and a switching cabinet, and changes high voltage into low voltage and large current into small current; the mutual inductor includes current transformer and voltage transformer, and wherein the secondary circuit inspection of mutual inductor is the important work in the electric power engineering construction, at traditional mutual inductor secondary circuit school line in-process, needs the staff operation of ascending a height, takes a percentage the secondary of mutual inductor body and demolishs, takes a percentage the secondary after the proofreading finishes again and resumes the wiring.
However, multiple technologies and safety personnel are needed to cooperate in the secondary loop detection process, great risks exist in ascending operation, and a long time is consumed for secondary tap removal; meanwhile, in the process of recovering the secondary tap of the transformer body, the accidents of poor contact heating of the tap, open circuit or short circuit of the transformer and the like easily occur due to recovery errors or infirm tap.
Disclosure of Invention
The embodiment of the application provides a device and a method for checking wires of a secondary circuit of a transformer, which are used for solving the problems that the operation of checking the wires of the secondary circuit of the existing transformer is complex and the accidents such as open circuit or short circuit of the transformer are easily caused.
In order to solve the above technical problem, an embodiment of the present application provides the following technical solutions:
the first aspect of the application provides a mutual-inductor secondary circuit school line device, it includes
The constant current source is used for providing preset direct current;
the Kelvin wire clamp group is connected with the constant current source to form a first loop and is used for connecting a preset terminal line core and a grounding grid of the mutual inductor so as to enable the preset terminal line core and a secondary winding binding post of the mutual inductor corresponding to the preset terminal line core to be connected to the first loop;
the direct-current millivoltmeter is connected to the first loop to detect a first voltage generated when the preset terminal row wire core and a secondary winding wiring terminal of a mutual inductor corresponding to the preset terminal row wire core are connected to the first loop;
the comparison unit is connected with the direct-current millivoltmeter to compare the first voltage with a preset voltage;
the display unit is connected with the comparison unit, and displays a first resistor corresponding to the first voltage when the first voltage is smaller than the preset voltage;
and the alarm unit is connected with the comparison unit, and alarms when the first voltage is smaller than the preset voltage.
In some modified embodiments of the first aspect of the present application, in the transformer secondary circuit line calibration apparatus, the comparison unit includes a comparator and a first adjustable resistor;
the comparator is connected with the first adjustable resistor so as to set the preset voltage through the first adjustable resistor;
the comparator is connected with the direct-current millivoltmeter to compare the first voltage with a preset voltage;
when the first voltage is smaller than the preset voltage, the comparator outputs a low level signal, and when the first voltage is larger than or equal to the preset voltage, the comparator outputs a high level signal.
In some modified embodiments of the first aspect of the present application, the aforementioned line calibration apparatus for a secondary circuit of a transformer, wherein the display unit includes a display;
the display is connected to the output end of the comparator;
when the first voltage is lower than the preset voltage, the display displays the first resistor, and when the first voltage is higher than the preset voltage, the display displays the resistor corresponding to the preset voltage;
the alarm unit comprises a sound broadcaster;
the sound broadcaster is connected to the output end of the comparator;
when the first voltage is smaller than the preset voltage, the sound broadcaster sounds, and when the first voltage is larger than the preset voltage, the sound broadcaster does not sound.
In some modified embodiments of the first aspect of the present application, in the transformer secondary circuit line calibration apparatus, the comparison unit further includes a voltage divider, a microvolt amplifier, a voltage follower, and a filter;
the voltage divider, the microvolt amplifier and the voltage follower are sequentially connected between the direct-current millivolt meter and the comparator, so that the first voltage is divided into a second voltage matched with the display, and the second voltage is transmitted to the comparator;
the filter is connected between the microvoltage amplifier and the display to stabilize the display reading.
In some modified embodiments of the first aspect of the present application, the aforementioned line calibration apparatus for a secondary circuit of a transformer further includes a second adjustable resistor;
the second adjustable resistor is connected between the constant current source and the Kelvin wire clamp group;
when the first loop is short-circuited by the Kelvin wire clip group, the number of the display units is zero through the adjustment of the second adjustable resistor.
In a second aspect of the present application, a line calibration method for a line calibration device of a secondary circuit of a transformer is provided, which includes the following steps:
preprocessing a line calibration device of a secondary circuit of a transformer and the transformer;
connecting a Kelvin wire clamp group of a secondary circuit wire calibration device of the mutual inductor to a preset terminal row wire core and a grounding grid of the mutual inductor to form a first circuit;
obtaining a display result of a secondary circuit line calibration device of the mutual inductor and a reaction of an alarm unit;
and judging whether the wiring of the secondary circuit of the transformer is correct or not.
In some modified embodiments of the second aspect of the present application, the step of preprocessing the transformer secondary circuit line calibration device and the transformer includes:
adjusting the resistance value of the first adjustable resistor according to the specification of the transformer to generate a preset voltage;
and scribing a secondary sliding block of the mutual inductor at the terminal row of the mutual inductor, dismantling the ground wire, and connecting a secondary winding binding post corresponding to a wire core of the preset terminal row in the mutual inductor into a grounding grid.
In some modified embodiments of the second aspect of the present application, the step of obtaining the display unit junction and the alarm unit response of the secondary circuit line calibration device of the transformer includes:
comparing the preset voltage with a first voltage of the first loop;
when the first voltage is lower than the preset voltage, the transformer secondary circuit line calibration device displays a first resistor corresponding to the first voltage, and the alarm unit sounds; when the first voltage is larger than or equal to the preset voltage, the mutual inductor secondary circuit line calibration device displays the resistance corresponding to the preset voltage, and the alarm unit does not sound.
In some modified embodiments of the second aspect of the present application, the first voltage is greater than or equal to the preset voltage, the transformer secondary circuit line calibration device displays a resistor corresponding to the preset voltage, and the alarm unit does not sound, and then the method further includes:
and reducing the preset voltage through the first adjustable resistor, and obtaining the reaction of the display unit junction and the alarm unit of the secondary circuit line calibration device of the mutual inductor again.
In some modified embodiments of the second aspect of the present application, the step of preprocessing the transformer secondary circuit line calibration device and the transformer further includes:
a zero setting mutual inductor secondary circuit line calibration device;
when the Kelvin wire clamp group is in short circuit with the first loop, the first resistance is enabled to be zero through a second adjustable resistance of a secondary loop wire calibration device of the mutual inductor.
Compared with the prior art, the transformer secondary circuit line calibration device provided by the first aspect of the application can easily connect the preset terminal bus bar core and the secondary winding terminal of the corresponding transformer to the kelvin circuit and the first circuit through the arrangement of the constant current source, the kelvin line clamp group and the direct current millivoltmeter, can easily obtain the resistance between the preset terminal bus bar core and the secondary winding terminal of the corresponding transformer through the direct current millivoltmeter and the constant current source, can eliminate errors caused by contact resistance of the measuring line and the measuring head, and avoids the risk of ascending operation; meanwhile, the line calibration result is effectively displayed through the double results of the display unit and the alarm unit, so that the line calibration efficiency is greatly improved; the problem of current transformer secondary circuit school line operation complicacy and lead to accidents such as mutual-inductor open circuit or short circuit easily is solved.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present application will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present application are illustrated by way of example and not by way of limitation in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:
fig. 1 schematically shows a structural block diagram of a transformer secondary circuit line calibration device provided in an embodiment of the present application;
fig. 2 is a schematic circuit diagram schematically illustrating an operating principle of a kelvin loop in a secondary loop wire calibration device of a transformer provided by an embodiment of the application;
fig. 3 is a schematic circuit diagram schematically illustrating an operating principle of an alarm unit in a transformer secondary circuit line calibration device provided by an embodiment of the application;
fig. 4 is a schematic flow chart illustrating a line calibration method of a transformer secondary circuit line calibration device provided by an embodiment of the application;
fig. 5 schematically illustrates another flow chart of a line calibration method of a line calibration device of a secondary circuit of a transformer according to an embodiment of the present application;
FIG. 6 is a schematic diagram illustrating an operation wiring diagram of an actual line calibration device of a secondary circuit line calibration device of a transformer provided by an embodiment of the application;
the reference numbers illustrate: the device comprises a constant current source 1, a power switch 11, a Kelvin wire clamp group 2, a first wire clamp 21, a second wire clamp 22, a direct current millivoltmeter 3, a comparison unit 4, a comparator 41, a first adjustable resistor 42, a voltage divider 43, a microvolt amplifier 44, a voltage follower 45, a filter 46, a display unit 5, an alarm unit 6, a mutual inductor 7 and a second adjustable resistor 8.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which this application belongs.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
example 1
Referring to fig. 1, fig. 2 and fig. 3, a constant current source 1, a kelvin line clamp group 2, a direct current millivolt meter 3, a comparing unit 4, a display unit 5 and an alarm unit 6 are included in the secondary circuit calibration device of the transformer provided in the embodiment of the present application, and the constant current source 1 is used for providing a preset direct current;
the kelvin wire clip group 2 is connected with the constant current source 1 to form a first loop, and the kelvin wire clip group 2 is used for connecting a preset terminal arrangement wire core (T1-Tn) of the transformer 7 and a grounding network, so that the preset terminal arrangement wire core (T1-Tn) and a secondary winding wiring terminal (S1-Sn) of the transformer 7 corresponding to the preset terminal arrangement wire core (T1-Tn) are connected to the first loop;
the direct-current millivolt meter 3 is connected to the first loop to detect that the preset terminal row wire cores (T1-Tn) and secondary winding wiring terminals (S1-Sn) of the mutual inductor 7 corresponding to the preset terminal row wire cores are connected to a first voltage generated by the first loop;
the comparison unit 4 is connected with the direct-current millivoltmeter 3 to compare the first voltage with a preset voltage;
the display unit 5 is connected with the comparison unit 4, and when the first voltage is smaller than the preset voltage, the display unit 5 displays a first resistor corresponding to the first voltage;
the alarm unit 6 is connected with the comparison unit 4, and when the first voltage is smaller than the preset voltage, the alarm unit 6 gives an alarm.
Specifically, in order to solve the problem that the conventional secondary circuit line calibration operation of the transformer is complex and is easy to cause accidents such as open circuit or short circuit of the transformer, the secondary circuit line calibration device for the transformer provided by the embodiment of the application does not need to perform secondary tapping on the transformer 7 and does not need to perform ascending operation when the preset terminal line bank core (T1-Tn) of the transformer 7 and the secondary winding binding post (S1-Sn) of the transformer 7 corresponding to the preset terminal line bank core (T1-Tn) are connected to the first circuit and the kelvin circuit for line calibration through the constant current source 1, the kelvin line clamp group 2 and the direct current millivolt meter 3, and the fault caused by contact resistance of the measuring line and the measuring head can be eliminated by the kelvin circuit, and whether the resistance value between the preset terminal line bank core (T1-Tn) of the transformer 7 and the secondary winding binding post (S1-Sn) of the transformer 7 corresponding to the transformer is consistent with the fault of the transformer 7 or not can be obtained The specification of the transformer 7 is set, whether the preset terminal row wire core (T1-Tn) of the transformer 7 and the secondary winding wiring terminal (S1-Sn) of the corresponding transformer 7 are correctly wired or not is judged, and the judgment result is displayed through the display unit 5 and the alarm unit 6 to improve the display effect.
The constant current source 1 is a direct current constant current source and can continuously send out stable direct current, in this embodiment, the constant current source 1 is set to be a TLV494 type precision constant current source so as to stably output 5V constant current, ensure the stability of a kelvin loop, namely the first loop, and improve the accuracy of a line calibration detection result; of course, it is to be understood that: the constant current source 1 is provided with a power switch 11, and the power switch 11 controls whether the constant current source 1 supplies power to the first loop.
Wherein the kelvin wire clamp group 2 has a first wire clamp 21 and a second wire clamp 22, the first wire clamp 21 and the second wire clamp 22 are detachably connected to the transformer secondary circuit line calibration device, when the first wire clamp 21 and the second wire clamp 22 are connected to the transformer secondary circuit line calibration device, first ends of the first wire clamp 21 and the second wire clamp 22 are connected to the constant current source 1, second ends of the first wire clamp 21 and the second wire clamp 22 are connected to form the first circuit (at this time, the constant current source 1 is short-circuited), second ends of the first wire clamp 21 and the second wire clamp 22 are respectively connected to a preset terminal row wire core (T1-Tn) and a ground network of the transformer 7, and the preset terminal row wire core (T1-Tn) of the transformer 7 and a secondary terminal (S1-Sn) of the transformer 7 corresponding thereto are connected to the first circuit, meanwhile, the secondary winding terminals (S1-Sn) of the transformer 7 need to be connected to the grounding grid to perform the wire calibration measurement, which is shown in fig. 6, for example: and respectively connecting the second ends of the first wire clamp 21 and the second wire clamp 22 with a preset terminal row wire core T1 and a grounding grid of the mutual inductor 7, and connecting a secondary winding wiring terminal S1 of the mutual inductor 7 into the grounding grid, so that wiring and wire calibration between SI and T1 are performed at the moment.
The direct current millivoltmeter 3 is an instrument for measuring and displaying voltage, the direct current millivoltmeter 3 is connected into the first loop, that is, a preset terminal line core (T1-Tn) and a ground grid of the transformer 7 can be measured, referring to fig. 2, the power switch 11 is turned on to supply power to the first loop, the voltage of the preset terminal line core (T1-Tn) of the transformer 7 and the secondary winding terminal (S1-Sn) of the transformer 7 corresponding thereto, that is, the first voltage is displayed through the direct current millivoltmeter 3, and then the resistance between the preset terminal line core (T1-Tn) of the transformer 7 and the secondary winding terminal (S1-Sn) of the transformer 7 corresponding thereto, that is, the first resistance can be obtained.
The comparison unit 4 has a function of comparing and analyzing data, and compares the first voltage with a preset voltage, that is, compares the first resistance with a resistance corresponding to the preset voltage; the resistor corresponding to the preset voltage is set according to the specification of the mutual inductor and used for being compared with the first resistor to serve as a reference value for judging whether the first resistor is correct or not; the preset voltage can be preset in the comparison unit; when the first voltage is smaller than the preset voltage, the comparison unit 4 outputs a low level signal, which indicates that the first resistor meets the specification of the transformer 7, and indicates that the preset terminal row wire core (T1-Tn) of the transformer 7 is correctly connected with the secondary winding wiring terminal (S1-Sn) of the corresponding transformer 7; on the contrary, when the first voltage is greater than or equal to the preset voltage, the comparing unit 4 outputs a high level signal, which indicates that the first resistor does not meet the specification of the transformer 7, and indicates that the preset terminal row wire core (T1-Tn) of the transformer 7 is connected with the secondary winding terminal (S1-Sn) of the transformer 7 corresponding to the preset terminal row wire core, or the preset voltage is selected too large, and the comparison is performed again after the wiring debugging or the preset voltage adjustment is required; the above-mentioned functions of the comparing unit 4 can be implemented by means of program editing or setting a comparator.
The display unit 5 has a display function and can be realized by arranging at least one display, the display unit 5 is connected to the output end of the comparison unit 4, when the display unit receives a low level signal, the first resistor is described to be in accordance with the specification of the mutual inductor 7, the preset terminal row wire core (T1-Tn) of the mutual inductor 7 and the secondary winding wiring terminal (S1-Sn) of the mutual inductor 7 corresponding to the preset terminal row wire core are correctly connected, the display unit 5 normally displays the first resistor for a detection person to check, and the detection person can replace the detection terminal row wire core; on the contrary, when the display unit receives a high level signal, the indication that the first resistor is too large does not meet the specification of the transformer 7 indicates that the preset terminal row wire core (T1-Tn) of the transformer 7 and the secondary winding wiring terminal (S1-Sn) of the transformer 7 corresponding to the preset terminal row wire core are connected with a problem or the preset voltage is selected too large, the display unit 5 can only display the preset voltage, and a detector needs to adjust the wiring or adjust the preset voltage setting and compare the preset voltage setting again; the display unit 5 has a lighting function, and can be lighted at night or in a dark condition to observe the display number, and the setting can be easily understood and realized by those skilled in the art, and will not be described in detail herein.
The alarm unit 6 has a warning function and can be at least one of an audible and visual alarm, a sound broadcaster and a buzzer, the alarm unit 6 is connected to the output end of the comparison unit 4, when the alarm unit 6 receives a low level signal, the first resistor is described to be in accordance with the specification of the mutual inductor 7, a preset terminal row wire core (T1-Tn) of the mutual inductor 7 and a secondary winding wiring terminal (S1-Sn) of the mutual inductor 7 corresponding to the preset terminal row wire core are correctly connected, the alarm unit 6 gives an alarm, and a detection person can replace a detection terminal row wire core; on the contrary, when the alarm unit 6 receives a high level signal, the first resistor is described to be out of line with the specification of the transformer 7, and the preset terminal row wire core (T1-Tn) of the transformer 7 and the secondary winding wiring terminal (S1-Sn) of the transformer 7 corresponding to the preset terminal row wire core are indicated to be connected with a problem or the preset voltage is selected too large, the alarm unit 6 does not give an alarm, namely, no prompt is given, and a detector needs to adjust the wiring or adjust the preset voltage setting, and compares the preset voltage setting again; it is of course to be understood that: the alarm unit 6 and the display unit 5 work synchronously, only if the display unit 5 displays the first resistor, and the alarm unit 6 sends out an alarm prompt to indicate that the preset terminal row wire core (T1-Tn) of the mutual inductor 7 is correctly connected with the secondary winding wiring terminal (S1-Sn) of the mutual inductor 7 corresponding to the preset terminal row wire core.
According to the above list, the transformer secondary circuit line calibration device provided by the first aspect of the present application can easily connect the preset terminal row line cores (T1-Tn) and the secondary winding terminals (T1-Tn) of the corresponding transformers to the kelvin circuit and the first circuit through the arrangement of the constant current source 1, the kelvin line clamp group 2 and the direct current millivolt meter 3, so that the resistances between the preset terminal row line cores (T1-Tn) and the secondary winding terminals (T1-Tn) of the corresponding transformers can be easily obtained through the direct current millivolt meter 3 and the constant current source 1, errors caused by contact resistances of a measuring line and a measuring head can be eliminated, and the risk of ascending operation is avoided; meanwhile, the line calibration result is effectively displayed through the double results of the display unit 5 and the alarm unit 6; the problem of current transformer secondary circuit school line operation complicacy and lead to accidents such as mutual-inductor open circuit or short circuit easily is solved.
The term "and/or" herein is merely an associative relationship describing an associated object, meaning that three relationships may exist, e.g., a and/or B, specifically understood as: both a and B may be included, a may be present alone, or B may be present alone, and any of the three cases can be provided.
Further, referring to fig. 3, in a specific implementation of the secondary circuit line calibration apparatus for a transformer provided in the embodiment of the present application, the comparing unit 4 includes a comparator 41 and a first adjustable resistor 42;
the comparator 41 is connected to the first adjustable resistor 42 to set the preset voltage through the first adjustable resistor 42;
the comparator 41 is connected with the direct-current millivoltmeter 3 to compare the first voltage with a preset voltage;
when the first voltage is less than the preset voltage, the comparator 41 outputs a low level signal, and when the first voltage is greater than or equal to the preset voltage, the comparator 41 outputs a high level signal.
Specifically, in order to implement the functions of comparing and analyzing the data of the comparing unit 4 and presetting the preset voltage, in this embodiment, the comparing unit 4 is configured to include a comparator 41 and a first adjustable resistor 42, where the comparator 41 may be a comparator of a model LM393G, and the first adjustable resistor 42 is a sliding rheostat or an electronic component adjustable resistor; the input end of the comparator 41 is connected to the direct current, the first voltage is accessed without table 3, the input end of the comparator 41 is simultaneously connected to the first adjustable resistor 42, when the current of the constant current source 1 is constant, the preset voltage can be adjusted through the first adjustable resistor 42, the preset resistor and the preset voltage are set according to the specification of the transformer 7 and are used as reference values for judging whether the first resistor is correct, the data setting is selected to be easily understood and obtained by a person skilled in the art, and redundant description is omitted; the output end of the comparator 41 is connected with the display unit 5 and the alarm unit 6 to display the comparison result; it is of course to be understood that: the 5V power supply on the right side in fig. 3 is a power supply for the whole device of the transformer secondary circuit line calibration device, and in fig. 3, the power supply supplies power for the comparator 41, the alarm unit 6, and the first adjustable resistor 42 (electronic component adjustable resistor).
Further, referring to fig. 1, in a specific implementation of the secondary circuit line calibration apparatus for a transformer provided in the embodiment of the present application, the comparison unit 4 further includes a voltage divider 43, a microvolt amplifier 44, a voltage follower 45, and a filter 46;
the voltage divider 43, the microvolt amplifier 44 and the voltage follower 45 are sequentially connected between the direct-current millivolt meter 3 and the comparator 41, so as to divide the first voltage into a second voltage adapted to the display and transmit the second voltage to the comparator 41;
the filter 46 is connected between the microvoltage amplifier 44 and the display to stabilize the display reading.
Specifically, in order to ensure stable display of the display unit 5 and avoid digital display fluctuation, the voltage divider 43, the microvolt amplifier 44, the voltage follower 45, and the filter 46 are disposed in the comparison unit 4 in this embodiment; in order to improve the display accuracy of the display unit 5, the voltage divider 43 and the microvoltage amplifier 44 are arranged to divide the first voltage to obtain the second voltage in cooperation with the specification and accuracy of the display unit 5 in the embodiment; the second voltage is input to the comparator 41 for comparison with the preset voltage by the voltage follower 45 and is stabilized by the filter 46, and the display unit 5 displays the stabilized second voltage, as can be understood herein: the second voltage is input to the comparator 41 and the display unit 5 synchronously, the display unit 5 receives signals of the comparator 41 and the filter 46 simultaneously, when the comparator 41 outputs a low level, the display unit 5 displays that a first resistor is obtained, and when the comparator 41 outputs a high level, the display unit 5 displays that a resistor corresponding to the preset voltage is obtained, at this time, the resistance value corresponding to the first resistor is too large, and the resistance value exceeds the specification of the resistor corresponding to the preset voltage, namely the specification of the transformer 7; the type of the microvolt amplifier 44 is AD8055, the type of the voltage follower is LM456, and the comparator 41 is further matched to ensure that the dynamic response time of the display unit 5 and the alarm unit 6 is less than 15 μ s, and the quick detection response time is less than 0.05 ms.
Further, referring to fig. 1 and fig. 2, in a specific implementation, the secondary circuit line calibration device for a transformer provided in the embodiment of the present application further includes a second adjustable resistor 8;
the second adjustable resistor 8 is connected between the constant current source 1 and the kelvin line clamp group 2;
when the kelvin wire clamp group 2 short circuits the first loop, the display unit 5 is adjusted to zero through the second adjustable resistor 8.
Specifically, in order to ensure the accuracy of the detection result of the terminal strip line core of each transformer 7, in this embodiment, the second adjustable resistor 8 is provided, and the second adjustable resistor 8 is a slide rheostat or an electronic component adjustable resistor; before the terminal row wire core of the wire calibration mutual inductor 7 is started, zero setting processing is carried out on the mutual inductor secondary circuit wire calibration device; specifically, before the kelvin wire clamp group 2 is connected with a preset terminal line core (T1-Tn) of the transformer 7 each time, the first wire clamp 21 and the second wire clamp 22 of the kelvin wire clamp group 2 are connected with each other to short-circuit the first circuit, and the indication number of the display unit 5 is zero (the direct current millivolt meter is also 0) through the adjustment of the second adjustable resistor 8, that is, the first resistor is zero, and then the first wire clamp 21 and the second wire clamp 22 are used to connect the preset terminal line core (T1-Tn) of the transformer 7 with the grounding grid to perform a normal line calibration process.
Example 2
Further, the line calibration method of the transformer secondary circuit line calibration device provided by the embodiment of the application comprises the following steps:
preprocessing a line calibration device of a secondary circuit of the mutual inductor and the mutual inductor 7;
connecting a Kelvin wire clamp group 2 of a secondary circuit wire calibration device of the transformer to a preset terminal row wire core (T1-Tn) of the transformer 7 and a grounding network to form a first circuit;
obtaining a display result of a secondary circuit line calibration device of the mutual inductor and a reaction of an alarm unit;
and judging whether the wiring of the secondary circuit of the transformer is correct or not.
Specifically, in order to solve the problems that the conventional secondary circuit line calibration of the transformer is complex in operation and easily causes accidents such as open circuit or short circuit of the transformer, the secondary circuit line calibration device of the transformer provided by the embodiment of the application provides the line calibration method, which specifically includes the following steps:
referring to FIG. 4:
101. according to the specification of the mutual inductor 7, the resistance value of the first adjustable resistor 42 is adjusted to generate a preset voltage;
102. a zero setting mutual inductor secondary circuit line calibration device;
specifically, when the kelvin wire clamp group 2 short circuits the first circuit, the first voltage (first resistance) is zero through a second adjustable 8-resistor of a transformer secondary circuit wire calibration device;
103. cutting a secondary sliding block of the mutual inductor 7 at the terminal row of the mutual inductor 7, removing a ground wire, and connecting a secondary winding binding post (S1-Sn) corresponding to a wire core (T1-Tn) of the preset terminal row in the mutual inductor 7 into a grounding grid;
specifically, the steps 101-103 belong to a preprocessing process performed on the transformer 7 and the transformer secondary circuit line calibration device, which is easy to understand and implement for those skilled in the art, and are not described herein again;
104. connecting a Kelvin wire clamp group 2 of a secondary circuit wire calibration device of the transformer to a preset terminal row wire core (T1-Tn) of the transformer 7 and a grounding network to form a first circuit;
specifically, referring to fig. 6, the first clip 21 and the second clip 2 of the kelvin clip group 2 are respectively connected to the terminal strip core T1 of the transformer 7 and the ground grid, the secondary winding terminal S1 of the corresponding transformer 7 is also connected to the ground grid, the power switch 11 of the constant current source 1 is turned on, so that the terminal strip core T1 and the secondary winding terminal S1 are connected to the first loop, and a first voltage is displayed at the position of the millivoltmeter dc 3;
105. comparing the preset voltage with a first voltage of the first loop;
specifically, the mv meter 3 outputs a first voltage, and inputs a second voltage to the comparator 41 through the voltage divider 43, the microvolt amplifier 44 and the voltage follower 45, the comparator 41 compares the second voltage with the preset voltage, and when the second voltage is smaller than the preset voltage, the comparator 41 outputs a low level signal, and step 106 is executed; on the contrary, when the second voltage is greater than or equal to the preset voltage, the comparator 41 outputs a high level signal, and step 107 is executed;
106. the line calibration device of the secondary circuit of the mutual inductor displays a first resistor corresponding to the second voltage, and the alarm unit 6 sounds;
at this time, the terminal row wire core T1 and the secondary winding terminal S1 are correctly connected, and the terminal row wire core T2 and the secondary winding terminal S2 can be replaced to perform detection according to steps 101-108; when the Kelvin wire clamp group 2 changes the wire core T2 of the clamping terminal row, the secondary winding wiring terminal S1 of the mutual inductor 7 is synchronously changed to be the secondary winding wiring terminal S2 connected to the grounding grid, and the rest is repeated;
107. the transformer secondary circuit line calibration device displays the resistance corresponding to the preset voltage, and the alarm unit does not sound, and step 108 is executed;
at the moment, the connection between the terminal row wire core T1 and the secondary winding wiring terminal S1 is indicated to be in a problem or the preset voltage is selected too much;
108. the preset voltage is reduced through the first adjustable resistor 42, and the terminal row wire core T1 and the secondary winding wiring terminal S1 are calibrated again in the step 101 and 105;
and if the mutual inductor secondary circuit line calibration device displays the resistance corresponding to the adjusted preset voltage, and the alarm unit does not sound, indicating that the terminal row line core T1 and the secondary winding wiring terminal S1 are connected with a problem, performing 101-108 line calibration on the terminal row line core T1 and the secondary winding wiring terminal S1 again after the adjustment and wiring.
Further, in order to ensure the accuracy of the wire calibration result, referring to fig. 5, after the step 106 of displaying the first resistor corresponding to the second voltage and the structure of the alarm unit 6 sounding, a verification process may be further included, where the verification process includes the following steps:
201. the first wire clamp 21 and the second wire clamp 2 of the kelvin wire clamp group 2 are respectively connected with a terminal row wire core T2 and a grounding grid of the mutual inductor 7, and a secondary winding terminal S1 of the mutual inductor 7 keeps a state of being connected into the grounding grid, so that the non-corresponding terminal row wire core T2 and the non-corresponding secondary winding terminal S1 are connected into the first loop, and a first voltage is displayed at a direct-current millivolt meter 3;
specifically, the secondary winding terminal S1 of the transformer 7 is kept connected to the ground network, and the terminal row core T2 of the transformer 7 is replaced, or the terminal row core T1 of the transformer 7 is kept, and the secondary winding terminal S2 of the transformer 7 is replaced and connected to the ground network;
202. comparing the preset voltage with a first voltage of the first loop;
specifically, the mv meter 3 outputs a first voltage, and a second voltage is input to the comparator 41 through the voltage divider 43, the microvolt amplifier 44 and the voltage follower 45, the comparator 41 compares the second voltage with the preset voltage, and when the second voltage is smaller than the preset voltage, the comparator 41 outputs a low level signal, and step 204 is executed; on the contrary, when the second voltage is greater than or equal to the preset voltage, the comparator 41 outputs a high level signal, and step 203 is executed;
203. the transformer secondary circuit line calibration device displays the resistance corresponding to the preset voltage, the alarm unit 6 does not sound, and the connection problem between the terminal row line core T2 and the secondary winding binding post S1 is shown, the result that the terminal row line core T1 and the secondary winding binding post S1 which are measured in the step 101 plus 108 are correctly connected is accurate, and the terminal row line core T2 and the secondary winding binding post S2 can be replaced to detect according to the step 101 plus 108;
204. the transformer secondary circuit line calibration device displays the first resistor corresponding to the second voltage, and the alarm unit 6 sounds to indicate that the connection between the terminal arrangement line core T1 and the secondary winding terminal S2 is correct, which indicates that the result of correct connection between the terminal arrangement line core T1 and the secondary winding terminal S1 measured in step 101 and 108 is problematic, and then step 108 needs to be executed.
Specifically, the transformer secondary circuit line calibration device in this embodiment is the transformer secondary circuit line calibration device in embodiment 1, and the detailed description of the specific structure and the specific working principle of the transformer secondary circuit line calibration device refer to the detailed description of embodiment 1, which is not described herein in detail.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a mutual-inductor secondary circuit school line device which characterized in that, it includes:
the constant current source is used for providing preset direct current;
the Kelvin wire clamp group is connected with the constant current source to form a first loop and is used for connecting a preset terminal line core and a grounding grid of the mutual inductor so as to enable the preset terminal line core and a secondary winding binding post of the mutual inductor corresponding to the preset terminal line core to be connected to the first loop;
the direct-current millivoltmeter is connected to the first loop to detect a first voltage generated when the preset terminal row wire core and a secondary winding wiring terminal of a mutual inductor corresponding to the preset terminal row wire core are connected to the first loop;
the comparison unit is connected with the direct-current millivoltmeter to compare the first voltage with a preset voltage;
the display unit is connected with the comparison unit, and displays a first resistor corresponding to the first voltage when the first voltage is smaller than the preset voltage;
and the alarm unit is connected with the comparison unit, and alarms when the first voltage is smaller than the preset voltage.
2. The mutual inductor secondary circuit line calibration device of claim 1, wherein:
the comparison unit comprises a comparator and a first adjustable resistor;
the comparator is connected with the first adjustable resistor so as to set the preset voltage through the first adjustable resistor;
the comparator is connected with the direct-current millivoltmeter to compare the first voltage with a preset voltage;
when the first voltage is smaller than the preset voltage, the comparator outputs a low level signal, and when the first voltage is larger than or equal to the preset voltage, the comparator outputs a high level signal.
3. The mutual inductor secondary circuit line calibration device of claim 2, wherein:
the display unit comprises a display;
the display is connected to the output end of the comparator;
when the first voltage is lower than the preset voltage, the display displays the first resistor, and when the first voltage is higher than the preset voltage, the display displays the resistor corresponding to the preset voltage;
the alarm unit comprises a sound broadcaster;
the sound broadcaster is connected to the output end of the comparator;
when the first voltage is smaller than the preset voltage, the sound broadcaster sounds, and when the first voltage is larger than the preset voltage, the sound broadcaster does not sound.
4. The mutual inductor secondary circuit line calibration device of claim 3, wherein:
the comparison unit further comprises a voltage divider, a microvolt amplifier, a voltage follower and a filter;
the voltage divider, the microvolt amplifier and the voltage follower are sequentially connected between the direct-current millivolt meter and the comparator, so that the first voltage is divided into a second voltage matched with the display, and the second voltage is transmitted to the comparator;
the filter is connected between the microvoltage amplifier and the display to stabilize the display reading.
5. The mutual inductor secondary circuit line calibration device of claim 1, wherein:
the device also comprises a second adjustable resistor;
the second adjustable resistor is connected between the constant current source and the Kelvin wire clamp group;
when the first loop is short-circuited by the Kelvin wire clip group, the number of the display units is zero through the adjustment of the second adjustable resistor.
6. The line calibration method of the transformer secondary circuit line calibration device according to any one of claims 1 to 5, characterized by comprising the following steps:
preprocessing a line calibration device of a secondary circuit of a transformer and the transformer;
connecting a Kelvin wire clamp group of a secondary circuit wire calibration device of the mutual inductor to a preset terminal row wire core and a grounding grid of the mutual inductor to form a first circuit;
obtaining a display result of a secondary circuit line calibration device of the mutual inductor and a reaction of an alarm unit;
and judging whether the wiring of the secondary circuit of the transformer is correct or not.
7. The method of claim 6, wherein the step of pre-processing the transformer secondary circuit line calibration device and the transformer comprises:
adjusting the resistance value of the first adjustable resistor according to the specification of the transformer to generate a preset voltage;
and scribing a secondary sliding block of the mutual inductor at the terminal row of the mutual inductor, dismantling the ground wire, and connecting a secondary winding binding post corresponding to a wire core of the preset terminal row in the mutual inductor into a grounding grid.
8. The wire calibration method of claim 7, wherein the step of obtaining the display unit junction and the alarm unit response of the transformer secondary circuit wire calibration device comprises the following steps:
comparing the preset voltage with a first voltage of the first loop;
when the first voltage is lower than the preset voltage, the transformer secondary circuit line calibration device displays a first resistor corresponding to the first voltage, and the alarm unit sounds; when the first voltage is larger than or equal to the preset voltage, the mutual inductor secondary circuit line calibration device displays the resistance corresponding to the preset voltage, and the alarm unit does not sound.
9. The wire calibration method according to claim 8, wherein the first voltage is greater than or equal to the preset voltage, the transformer secondary circuit wire calibration device displays a resistance corresponding to the preset voltage, and the alarm unit does not sound, and then the method further comprises the following steps:
and reducing the preset voltage through the first adjustable resistor, and obtaining the reaction of the display unit junction and the alarm unit of the secondary circuit line calibration device of the mutual inductor again.
10. The method of claim 8, wherein the step of preprocessing the transformer secondary circuit line calibration device and the transformer further comprises:
a zero setting mutual inductor secondary circuit line calibration device;
when the Kelvin wire clamp group is in short circuit with the first loop, the first resistance is enabled to be zero through a second adjustable resistance of a secondary loop wire calibration device of the mutual inductor.
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