CN104820161B - A kind of multi-tap secondary wiring of current mutual inductor detection means - Google Patents
A kind of multi-tap secondary wiring of current mutual inductor detection means Download PDFInfo
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Abstract
The embodiment of the present invention provides a kind of multi-tap secondary wiring of current mutual inductor detection means, including：Power end, pressure regulator, isolating transformer, the first ammeter and the second ammeter, power end, pressure regulator and isolating transformer are sequentially connected；Isolating transformer includes two output ends, when being detected to multi-tap secondary wiring of current mutual inductor to be measured, is connected with the off-peak tap of any two no-load voltage ratios in the multi-tap current transformer to be measured, to input current between two coupled taps；First ammeter, is connected with any output end of the isolating transformer, the output current value for detecting the isolating transformer；Second ammeter, for when being detected to multi-tap secondary wiring of current mutual inductor to be measured, two taps maximum with no-load voltage ratio in the multi-tap current transformer to be measured to be connected, detects the current value between the maximum tap of the no-load voltage ratio.With higher security, and implement more simple and fast.
Description
Technical Field
The invention relates to the field of power detection, in particular to a secondary wiring detection device of a multi-tap current transformer.
Background
In an electric power system, a secondary loop of a current transformer is an important component of a protection, measurement and control and automation device, and is a key factor for ensuring the electric power system to operate safely and reliably when the protection device acts correctly. The current transformer is opened secondarily or the wiring is incorrect, so that equipment is abnormal or a protection device cannot act correctly, and the safety operation of a power system is seriously damaged, so that the checking of the wiring correctness of a secondary circuit of the current transformer is an important work of relay protection profession.
At present, the common methods for checking the wiring of the current transformer mainly comprise primary through current, secondary through current and the like of a secondary cable core of the current transformer. Because become bushing current transformer and install on the seat that rises usually, the position of its secondary cable terminal box is high, need use the rising car to climb on the transformer when taking apart and connecing secondary cable or through-flow test, the dismouting inspection degree of difficulty of secondary cable is high, has the danger that the high altitude falls in the operation process, and the security is lower promptly. Meanwhile, the primary through-flow inspection of the multi-tap current transformer needs primary maintenance and the cooperation of high-voltage testing personnel, and after the main transformer bushing current transformer is installed, a primary large-current inspection secondary current loop is difficult to realize due to the large reactance of a main transformer winding; the secondary through-flow inspection is multi-faceted and wide in point, and needs to be completed by matching a plurality of secondary maintainers; the current transformer with multiple taps, particularly the main transformer bushing current transformer, has multiple taps, large workload of secondary cable removal and wiring, and the like, and the method for checking the wiring of the current transformer with the multiple taps needs multiple persons to be matched and finished, thereby consuming time and labor.
Disclosure of Invention
In view of this, the embodiment of the present invention provides a multi-tap current transformer secondary connection detection apparatus, so as to solve the problems of low safety, time consuming and labor consuming due to the need of multiple persons to complete the detection in the prior art.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a multi-tap current transformer secondary wiring detection device comprises: the power supply device comprises a power supply end, a voltage regulator, an isolation transformer, a first ammeter and a second ammeter, wherein the power supply end, the voltage regulator and the isolation transformer are sequentially connected; wherein,
the isolation transformer comprises two output ends, is used for connecting with any two taps with non-maximum transformation ratios in the multi-tap current transformer to be detected when detecting the secondary wiring of the multi-tap current transformer to be detected, and inputs current between the two taps connected with the isolation transformer;
the first ammeter is connected with any output end of the isolation transformer and is used for detecting the output current value of the isolation transformer;
and the second ammeter is used for being connected with the two taps with the largest transformation ratio in the multi-tap current transformer to be detected when detecting the secondary wiring of the multi-tap current transformer to be detected, and detecting the current value between the taps with the largest transformation ratio.
Wherein, the secondary wiring detection device of the multi-tap current transformer further comprises: and the impedance meter is connected with the two output ends of the isolation transformer and used for detecting a secondary impedance value between two taps connected with the isolation transformer when detecting the secondary wiring of the multi-tap current transformer to be detected.
Wherein, the secondary wiring detection device of the multi-tap current transformer further comprises: and the clamp meter is used for detecting the current value between the taps with the largest transformation ratio in the multi-tap current transformer to be detected.
Wherein, the secondary wiring detection device of the multi-tap current transformer further comprises: and the box body is used for accommodating the power supply end, the voltage regulator, the isolation transformer, the first ammeter and the second ammeter.
Wherein, the secondary wiring detection device of the multi-tap current transformer further comprises: a panel including a first display region and a second display region;
the first display area is used for outputting the output current of the isolation transformer and displaying the numerical value of the first ammeter;
and the second display area is used for accessing the current between the two taps with the maximum transformation ratio in the multi-tap current transformer to be tested and displaying the numerical value of the second ammeter.
Wherein the first display area includes: a first display screen and two input terminals; wherein,
the first display screen is connected with the first ammeter and used for displaying the numerical value of the first ammeter;
the two input terminals are respectively connected with the two output ends of the isolation transformer and used for outputting the output current of the isolation transformer.
Wherein the second display area includes: a second display screen and two output terminals; wherein,
the second display screen is connected with the second ammeter and used for displaying the numerical value of the second ammeter;
and the two output terminals are respectively connected with two ends of the second ammeter and used for connecting the current between the two taps with the maximum transformation ratio in the multi-tap current transformer to be tested to two ends of the second ammeter.
Wherein the panel further comprises: and the third display area comprises a third display screen, and the third display screen is connected with the impedance meter and used for displaying the numerical value of the impedance meter.
Wherein the panel further comprises: the power supply comprises a power supply area, wherein the power supply area comprises an alternating current input socket and a power switch, and after the power switch is closed, alternating current is provided for a power supply end through the alternating current input socket.
Wherein, the secondary wiring detection device of the multi-tap current transformer further comprises: a ground terminal;
the panel further includes: and the grounding terminal is connected with the grounding terminal and is used for grounding the grounding terminal through a grounding wire.
Based on the above technical solution, an embodiment of the present invention provides a multi-tap current transformer secondary connection detection apparatus, including: the power supply device comprises a power supply end, a voltage regulator, an isolation transformer, a first ammeter and a second ammeter, wherein the power supply end, the voltage regulator and the isolation transformer are sequentially connected; the isolation transformer comprises two output ends, a first output end and a second output end, wherein the two output ends are used for being connected with any two taps with non-maximum transformation ratios in the multi-tap current transformer to be detected when the secondary connection of the multi-tap current transformer to be detected is detected, and current is input between the two taps connected with the isolation transformer; the first ammeter is connected with any output end of the isolation transformer and is used for detecting the output current value of the isolation transformer; and the second ammeter is used for being connected with the two taps with the largest transformation ratio in the multi-tap current transformer to be detected when detecting the secondary wiring of the multi-tap current transformer to be detected, and detecting the current value between the taps with the largest transformation ratio. When the secondary connection of the multi-tap current transformer to be detected needs to be detected, any two taps with non-maximum transformation ratios in the multi-tap current transformer to be detected are connected with the output end of the isolation transformer, input current is seen to the two taps of the multi-tap current transformer to be detected, the output current value of the isolation transformer is detected by using the first ammeter, namely, the current value of the input isolation transformer is detected, the current between the two taps with the maximum transformation ratios in the multi-tap current transformer to be detected is detected by using the second ammeter, and the transformation ratios among the taps of the multi-tap current transformer to be detected are known, so that whether the ratio between the current value detected by the first ammeter and the current value detected by the second ammeter is equal to the ratio between the maximum transformation ratio of the multi-tap current transformer to be detected and the transformation ratio among the taps connected with the isolation transformer or not can be judged, and judging whether the secondary wiring of the multi-tap current transformer to be tested is correct or not. The secondary connection of the multi-tap current transformer can be detected only by connecting the tap of the multi-tap current transformer to be detected with the multi-tap current transformer provided by the embodiment of the invention, reading the numbers of the first ammeter and the second ammeter in the multi-tap current transformer, and judging whether the ratio between the current value measured by the first ammeter and the current value measured by the second ammeter is equal to the ratio between the maximum transformation ratio of the multi-tap current transformer to be detected and the transformation ratio between the taps connected with the isolation transformer, so that the secondary connection of the multi-tap current transformer can be detected without the high-altitude operation of workers and the participation of multiple persons, and the multi-tap current transformer has higher safety and is simpler and quicker to implement.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a secondary connection detection device of a multi-tap current transformer according to an embodiment of the present invention;
fig. 2 is another connection diagram of the secondary connection detection device of the multi-tap current transformer according to the embodiment of the present invention;
fig. 3 is a schematic structural diagram of a panel in the secondary connection detection device of the multi-tap current transformer according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a secondary connection detection device for a multi-tap current transformer according to an embodiment of the present invention, where only taps of the multi-tap current transformer to be detected need to be connected to the multi-tap current transformer according to the embodiment of the present invention, and numbers of a first ammeter and a second ammeter in the multi-tap current transformer are read, and a ratio between a current value measured by the first ammeter and a current value measured by the second ammeter is determined, and is equal to a ratio between a maximum transformation ratio of the multi-tap current transformer to be detected and a transformation ratio between taps connected to an isolation transformer, so that secondary connection of the multi-tap current transformer can be detected without high-altitude operation of a worker or participation of multiple persons, and the secondary connection detection device has higher safety and is simpler and faster to implement; referring to fig. 1, the multi-tap current transformer secondary wiring detection apparatus may include: a power supply terminal 100, a voltage regulator 200, an isolation transformer 300, a first ammeter 400 and a second ammeter 500.
The power supply terminal 100, the voltage regulator 200 and the isolation transformer 300 are connected in sequence. The power supply terminal 100 is connected in series with the voltage regulator 200 and the isolation transformer 300, so that the power supply signal inputted from the power supply terminal 100 can supply power to the voltage regulator 200 and the isolation transformer 300, respectively.
Alternatively, the power supply terminal 100 may input ac commercial power having a voltage of 220 volts.
The voltage regulator 200 is configured to regulate the received power information, and may control the output voltage and the output current of the isolation transformer 300 by controlling the voltage regulator 200, and the isolation transformer 300 isolates the power information having a current value greater than a predetermined value in the power information output by the voltage regulator 100, so as to maintain the stability of the output current of the isolation transformer 300.
The isolation transformer 300 includes two output ends, and when detecting the secondary connection of the multi-tap current transformer to be detected, the two output ends of the isolation transformer 300 are respectively connected with any two taps with non-maximum transformation ratios in the multi-tap current transformer to be detected, and current is input between the two taps connected with the isolation transformer. For example, if the multi-tap current transformer to be tested includes 5 taps, wherein the transformation ratios of the first tap to the second tap, the third tap, the fourth tap and the fifth tap are 200/5, 300/5, 400/5 and 600/5, respectively, then the transformation ratio between the first tap and the fifth tap in the multi-tap current transformer to be tested is the largest, the two output ends of the isolation transformer 300 are connected to any two non-largest taps in the multi-tap current transformer to be tested, and it is only necessary that the two output ends of the isolation transformer 300 are not connected to the first tap and the fifth tap, respectively.
The first ammeter 400 is connected to any one of the output terminals of the isolation transformer 300, and the current value of the output current of the isolation transformer 300 is detected by the first ammeter 400, and since the two output terminals of the isolation transformer 300 are respectively connected to any two taps with non-maximum transformation ratios in the multi-tap current transformer to be detected, it can also be said that the current value input to the isolation transformer is detected by the first ammeter 400.
When detecting the secondary connection of the multi-tap current transformer to be detected, the second ammeter 500 is connected with the two taps with the largest transformation ratio in the multi-tap current transformer to be detected, and the current value between the taps with the largest transformation ratio is detected. For example, if the multi-tap current transformer to be tested includes 5 taps, and the transformation ratios of the first tap to the second tap, the third tap, the fourth tap and the fifth tap are 200/5, 300/5, 400/5 and 600/5, respectively, then the first tap and the fifth tap in the multi-tap current transformer to be tested have the largest transformation ratio, and the second ammeter 500 is connected to the two taps of the multi-tap current transformer to be tested, that is, the second ammeter 500 is connected to the first tap and the fifth tap.
Since the transformation ratio between the taps of the multi-tap current transformer to be tested is known, after the first ammeter 400 and the second ammeter are determined to be respectively used for detecting the two taps of the multi-tap current transformer to be tested and determining the transformation ratio between the detected taps, whether the secondary connection of the multi-tap current transformer to be tested is correct or not can be judged by judging whether the ratio between the current value measured by the first ammeter and the current value measured by the second ammeter is equal to the ratio between the maximum transformation ratio of the multi-tap current transformer to be tested and the transformation ratio between the taps connected with the isolation transformer.
It should be noted that, it is determined whether a ratio between a current value measured by the first ammeter and a current value measured by the second ammeter is equal to a ratio between a maximum transformation ratio of the multi-tap current transformer to be measured and a transformation ratio between taps connected to the isolation transformer. If the ratio between the current value measured by the first ammeter and the current value measured by the second ammeter is not equal to the ratio between the maximum transformation ratio of the multi-tap current transformer to be measured and the transformation ratio between the taps connected with the isolation transformer, the ratio between the current value measured by the first ammeter and the current value measured by the second ammeter is judged to be equal to the ratio between the maximum transformation ratio of the multi-tap current transformer to be measured and the transformation ratio between the taps connected with the isolation transformer. Due to errors and the like, whether the ratio between the current value measured by the first ammeter and the current value measured by the second ammeter is equal to the ratio between the maximum transformation ratio of the multi-tap current transformer to be measured and the transformation ratio between taps connected with the isolation transformer or not can be equal within an error allowable range.
For example, if the multi-tap current transformer to be tested includes 5 taps, the transformation ratios of the first tap to the second tap, the third tap, the fourth tap and the fifth tap are 200/5, 300/5, 400/5 and 600/5, respectively, the output end of the isolation transformer 300 is connected to the first tap and the second tap, respectively, the voltage regulator 200 is used to adjust the output voltage of the isolation transformer 300 to 3A, that is, the reading of the first ammeter 400 is 3A, the current input between the first tap and the second tap of the multi-tap current transformer to be tested is 3A, and the allowable error is set to 0.1A. Then, since the ratio between the transformation ratio between the first tap and the fifth tap, that is, the maximum transformation ratio of the multi-tap current transformer to be tested, and the transformation ratio between the first tap and the second tap is (600/5)/(200/5) ═ 3, it is only necessary to read the value of the second current, and determine whether the secondary connection of the multi-tap current transformer to be tested is correct by determining whether the ratio between the current value measured by the first ammeter and the current value measured by the second ammeter is 3. If the ratio of the current value measured by the first ammeter to the current value measured by the second ammeter is 3, namely, the current value measured by the 3/second ammeter is 3, namely, the numerical value of the read second ammeter is 1A +/-0.1A, then the secondary wiring of the multi-tap current transformer to be measured is considered to be correct; on the contrary, if the read numerical value of the second ammeter is no longer 1A +/-0.1A, the secondary wiring of the multi-tap current transformer to be tested is considered to have an error.
Based on the above technical solution, an embodiment of the present invention provides a multi-tap current transformer secondary connection detection apparatus, including: the power supply device comprises a power supply end, a voltage regulator, an isolation transformer, a first ammeter and a second ammeter, wherein the power supply end, the voltage regulator and the isolation transformer are sequentially connected; the isolation transformer comprises two output ends, a first output end and a second output end, wherein the two output ends are used for being connected with any two taps with non-maximum transformation ratios in the multi-tap current transformer to be detected when the secondary connection of the multi-tap current transformer to be detected is detected, and current is input between the two taps connected with the isolation transformer; the first ammeter is connected with any output end of the isolation transformer and is used for detecting the output current value of the isolation transformer; and the second ammeter is used for being connected with the two taps with the largest transformation ratio in the multi-tap current transformer to be detected when detecting the secondary wiring of the multi-tap current transformer to be detected, and detecting the current value between the taps with the largest transformation ratio. When the secondary connection of the multi-tap current transformer to be detected needs to be detected, any two taps with non-maximum transformation ratios in the multi-tap current transformer to be detected are connected with the output end of the isolation transformer, input current is seen to the two taps of the multi-tap current transformer to be detected, the output current value of the isolation transformer is detected by using the first ammeter, namely, the current value of the input isolation transformer is detected, the current between the two taps with the maximum transformation ratios in the multi-tap current transformer to be detected is detected by using the second ammeter, and the transformation ratios among the taps of the multi-tap current transformer to be detected are known, so that whether the ratio between the current value detected by the first ammeter and the current value detected by the second ammeter is equal to the ratio between the maximum transformation ratio of the multi-tap current transformer to be detected and the transformation ratio among the taps connected with the isolation transformer or not can be judged, and judging whether the secondary wiring of the multi-tap current transformer to be tested is correct or not. The secondary connection of the multi-tap current transformer can be detected only by connecting the tap of the multi-tap current transformer to be detected with the multi-tap current transformer provided by the embodiment of the invention, reading the numbers of the first ammeter and the second ammeter in the multi-tap current transformer, and judging whether the ratio between the current value measured by the first ammeter and the current value measured by the second ammeter is equal to the ratio between the maximum transformation ratio of the multi-tap current transformer to be detected and the transformation ratio between the taps connected with the isolation transformer, so that the secondary connection of the multi-tap current transformer can be detected without the high-altitude operation of workers and the participation of multiple persons, and the multi-tap current transformer has higher safety and is simpler and quicker to implement.
Optionally, fig. 2 shows another connection schematic diagram of the multi-tap current transformer secondary connection detection apparatus provided in the embodiment of the present invention, and referring to fig. 2, the multi-tap current transformer secondary connection detection apparatus may further include: impedance table 600.
The impedance meter 600 is connected with two output ends of the isolation transformer 300, when the secondary connection of the multi-tap current transformer to be tested is detected, the impedance meter 600 can detect the secondary impedance value between two taps connected with the isolation transformer 300, and the impedance meter 600 can also be used for secondary through-flow impedance test of relay protection profession.
Optionally, the multi-tap current transformer secondary wiring detection device provided in the embodiment of the present invention may further include a clamp meter, and after the multi-tap current transformer to be measured has been connected to the multi-tap current transformer secondary wiring detection device, the current of the multi-tap current transformer to be measured may be measured by the clamp meter, and it is not necessary to cut off the connection relationship between the multi-tap current transformer to be measured and the multi-tap current transformer secondary wiring detection device first, so that convenience is provided for measuring the current of the multi-tap current transformer to be measured.
Meanwhile, the condition of whether short circuit exists between each terminal of the multi-tap current transformer to be tested can be found through the clamp meter, and accidents caused by short circuit or open circuit of the taps of the secondary winding of the multi-tap current transformer to be tested are avoided.
Optionally, the apparatus for detecting secondary wiring of a multi-tap current transformer provided in the embodiment of the present invention may further include: and (4) a box body.
The case is used to accommodate the power source terminal 100, the voltage regulator 200, the isolation transformer 300, the first ammeter 400 and the second ammeter 500.
When the secondary wiring detection device of the multi-tap current transformer provided by the embodiment of the invention further comprises the impedance meter 600, the impedance meter 600 can also be placed in the box body.
The power supply end 100, the voltage regulator 200, the isolation transformer 300, the first ammeter 400 and the second ammeter 500 are accommodated in a box body, so that the power supply end 100, the voltage regulator 200, the isolation transformer 300, the first ammeter 400 and the second ammeter 500 are fixed in one box body, centralized operation is facilitated, space is saved, and storage and carrying are facilitated.
Optionally, the power supply end 100, the voltage regulator 200, the isolation transformer 300, the first ammeter 400 and the second ammeter 500 may be disposed inside a box, and since the box has a housing, the housing has a protection and blocking function, so that the power supply end 100, the voltage regulator 200, the isolation transformer 300, the first ammeter 400 and the second ammeter 500 may be well protected; and the power supply end 100, the voltage regulator 200, the isolation transformer 300, the first ammeter 400 and the second ammeter 500 which are positioned in the box body are not easy to lose, so that the integrity of the secondary wiring detection device of the multi-tap current transformer is protected.
Optionally, the power supply end 100, the voltage regulator 200, the isolation transformer 300, the first ammeter 400 and the second ammeter 500 may be disposed on a surface of the box, and the power supply end 100, the voltage regulator 200, the isolation transformer 300, the first ammeter 400 and the second ammeter 500 may be disposed on a surface of the box, so that the multi-tap current transformer secondary connection detection apparatus may be used for analog detection of performance attribute detection of the capacitive device at any time.
Optionally, the device for detecting secondary wiring of a multi-tap current transformer provided in the embodiment of the present invention may further include: the panel 700 realizes the detection of the secondary wiring of the multi-tap current transformer through the operation of the equipment on the panel 700, so that the operation process is simpler and more convenient.
Optionally, fig. 3 shows a schematic structural diagram of a panel 700 in the secondary connection detection apparatus for a multi-tap current transformer provided in the embodiment of the present invention, and referring to fig. 2, the panel 700 may include: a first display area 710 and a second display area 720, wherein,
the first display area 710 is used for outputting the output current of the isolation transformer 300 and displaying the value of the first ammeter 400.
Optionally, the first display area 710 may include: a first display screen and two input terminals.
The first display screen is connected to the first ammeter 400, and is configured to display a value of the first ammeter 400.
And two input terminals respectively connected to two output terminals of the isolation transformer 300, for outputting the output current of the isolation transformer 300.
And the second display area 720 is used for accessing the current between the two taps with the largest transformation ratio in the multi-tap current transformer to be tested and displaying the numerical value of the second ammeter.
Alternatively, the second display region 720 may include: a second display screen and two output terminals.
The second display screen is connected to the second ammeter 500 for displaying the value of the second ammeter 500.
And two output terminals respectively connected to two ends of the second ammeter 500, for connecting the current between the two taps with the largest transformation ratio in the multi-tap current transformer to be tested to two ends of the second ammeter 500.
Optionally, referring to fig. 3, a schematic structural diagram of a panel 700 in the secondary connection detection apparatus for a multi-tap current transformer according to the embodiment of the present invention, where the panel 700 in the apparatus may further include: a third display area 730.
When the impedance meter 600 is included in the apparatus for detecting secondary connection of a multi-tap current transformer according to the embodiment of the present invention, a third display area 730 may be disposed on the panel 700 for displaying the value of the impedance meter 600.
Optionally, the third display area 730 may include a third display screen, which is connected to the impedance meter 600 and is used for displaying the value of the impedance meter 600.
When the secondary wiring detection device for the multi-tap current transformer provided by the embodiment of the invention comprises the clamp meter, one clamp meter jack 740 can be arranged on the panel 700, and after the clamp meter is inserted into the clamp meter jack 740, the current value between two taps with the maximum transformation ratio in the multi-tap current transformer to be detected can be read on the clamp meter 740.
Optionally, referring to fig. 3, a panel 700 in the secondary connection detection apparatus for a multi-tap current transformer according to the embodiment of the present invention may further include: a power supply area 750 of the power supply,
the power supply area 750 includes an ac input socket and a voltage switch, the ac input socket is connected to the power supply terminal 100, when the voltage switch is closed, the multi-tap current transformer secondary connection detection apparatus provided in the embodiment of the present invention starts to operate, and may provide ac power to the power supply terminal 100 through the ac input socket, and when the voltage switch is not closed, the multi-tap current transformer secondary connection detection apparatus provided in the embodiment of the present invention stops operating.
Alternatively, the ac input socket may be connected to 220 v ac mains.
Alternatively, the ac power input socket may be a three-jack socket.
Optionally, the device for detecting secondary wiring of a multi-tap current transformer provided in the embodiment of the present invention may further include: and a ground terminal.
Correspondingly, optionally, referring to fig. 3, the panel 700 in the secondary connection detection apparatus for a multi-tap current transformer according to the embodiment of the present invention may further include: and a ground terminal 760 connected to a ground terminal of the multi-tap current transformer secondary connection detection device, for grounding the ground terminal via a ground line to prevent accidents such as leakage.
According to the secondary wiring detection device of the multi-tap current transformer, provided by the embodiment of the invention, the taps of the multi-tap current transformer to be detected are connected with the multi-tap current transformer provided by the embodiment of the invention, the numbers of the first ammeter and the second ammeter in the multi-tap current transformer are read, and the ratio between the current value measured by the first ammeter and the current value measured by the second ammeter is judged to be equal to the ratio between the maximum transformation ratio of the multi-tap current transformer to be detected and the transformation ratio between the taps connected with the isolation transformer, so that the secondary wiring of the multi-tap current transformer can be detected without high-altitude operation of workers and participation of multiple persons.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a current transformer secondary wiring detection device that takes a percentage more, its characterized in that includes: the power supply device comprises a power supply end, a voltage regulator, an isolation transformer, a first ammeter and a second ammeter, wherein the power supply end, the voltage regulator and the isolation transformer are sequentially connected; wherein,
the isolation transformer comprises two output ends, is used for connecting with any two taps with non-maximum transformation ratios in the multi-tap current transformer to be detected when detecting the secondary wiring of the multi-tap current transformer to be detected, and inputs current between the two taps connected with the isolation transformer;
the first ammeter is connected with any output end of the isolation transformer and is used for detecting the output current value of the isolation transformer;
and the second ammeter is used for being connected with the two taps with the largest transformation ratio in the multi-tap current transformer to be detected when detecting the secondary wiring of the multi-tap current transformer to be detected, and detecting the current value between the taps with the largest transformation ratio.
2. The multi-tap current transformer secondary wiring detection device of claim 1, further comprising: and the impedance meter is connected with the two output ends of the isolation transformer and used for detecting a secondary impedance value between two taps connected with the isolation transformer when detecting the secondary wiring of the multi-tap current transformer to be detected.
3. The multi-tap current transformer secondary wiring detection device of claim 1, further comprising: and the clamp meter is used for detecting the current value between the taps with the largest transformation ratio in the multi-tap current transformer to be detected.
4. The multi-tap current transformer secondary wiring detection device of claim 1, further comprising: and the box body is used for accommodating the power supply end, the voltage regulator, the isolation transformer, the first ammeter and the second ammeter.
5. The multi-tap current transformer secondary wiring detection device of claim 2, further comprising: a panel including a first display region and a second display region;
the first display area is used for outputting the output current of the isolation transformer and displaying the numerical value of the first ammeter;
and the second display area is used for accessing the current between the two taps with the maximum transformation ratio in the multi-tap current transformer to be tested and displaying the numerical value of the second ammeter.
6. The multi-tap current transformer secondary wiring detection device of claim 5, wherein the first display area comprises: a first display screen and two input terminals; wherein,
the first display screen is connected with the first ammeter and used for displaying the numerical value of the first ammeter;
the two input terminals are respectively connected with the two output ends of the isolation transformer and used for outputting the output current of the isolation transformer.
7. The multi-tap current transformer secondary wiring detection device of claim 5, wherein the second display area comprises: a second display screen and two output terminals; wherein,
the second display screen is connected with the second ammeter and used for displaying the numerical value of the second ammeter;
and the two output terminals are respectively connected with two ends of the second ammeter and used for connecting the current between the two taps with the maximum transformation ratio in the multi-tap current transformer to be tested to two ends of the second ammeter.
8. The multi-tap current transformer secondary wiring detection device of claim 5, wherein said panel further comprises: and the third display area comprises a third display screen, and the third display screen is connected with the impedance meter and used for displaying the numerical value of the impedance meter.
9. The multi-tap current transformer secondary wiring detection device of claim 5, wherein said panel further comprises: the power supply comprises a power supply area, wherein the power supply area comprises an alternating current input socket and a power switch, and after the power switch is closed, alternating current is provided for a power supply end through the alternating current input socket.
10. The multi-tap current transformer secondary wiring detection device of claim 5,
the secondary wiring detection device of the multi-tap current transformer further comprises: a ground terminal;
the panel further includes: and the grounding terminal is connected with the grounding terminal and is used for grounding the grounding terminal through a grounding wire.
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| CN108802476B (en) * | 2018-06-13 | 2024-07-02 | 贵州电网有限责任公司 | Direct current transformer and current testing method thereof |
| CN110488137A (en) * | 2019-09-03 | 2019-11-22 | 广东电网有限责任公司 | A kind of apparatus and method detecting CT secondary circuit integrality |
| CN114137469A (en) * | 2021-11-25 | 2022-03-04 | 国网陕西省电力公司西咸新区供电公司 | Method and system for realizing intelligent calibration of multi-tap current transformer |
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