CN112834798A - Transformation ratio testing method, transformation ratio testing device, testing equipment and storage medium - Google Patents

Transformation ratio testing method, transformation ratio testing device, testing equipment and storage medium Download PDF

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Publication number
CN112834798A
CN112834798A CN202011518573.5A CN202011518573A CN112834798A CN 112834798 A CN112834798 A CN 112834798A CN 202011518573 A CN202011518573 A CN 202011518573A CN 112834798 A CN112834798 A CN 112834798A
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China
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transformation ratio
current
sampling point
point number
transformer
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CN202011518573.5A
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CN112834798B (en
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陈海跃
欧阳健
赵法强
翟伟斌
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Shenzhen Power Supply Bureau Co Ltd
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Shenzhen Power Supply Bureau Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/20—Measuring number of turns; Measuring transformation ratio or coupling factor of windings
    • G—PHYSICS
    • 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

Abstract

The application relates to a transformation ratio testing method, a transformation ratio testing device, a testing device and a storage medium, which are applied to a transformation ratio testing system, wherein the transformation ratio testing system comprises a testing device, a first transformation ratio testing terminal arranged on the primary side of a mutual inductor and a second transformation ratio testing terminal arranged on the secondary side of the mutual inductor; the test equipment respectively sends time synchronization instructions to the first transformation ratio test terminal and the second transformation ratio test terminal; the test equipment respectively receives a first sampling point number and a first current value which are obtained by the first transformation ratio test terminal, and a second sampling point number and a second current value which are obtained by the second transformation ratio test terminal; the testing equipment judges whether the primary side current and the secondary side current of the mutual inductor are in phase or not according to the first sampling point number and the second sampling point number to obtain a judgment result; the test equipment determines whether to determine the transformation ratio of the transformer according to the first current value and the second current value according to the judgment result; the accuracy of the current transformer transformation ratio test result is improved.

Description

Transformation ratio testing method, transformation ratio testing device, testing equipment and storage medium
Technical Field
The present application relates to the field of electrical testing technologies, and in particular, to a method and an apparatus for testing a transformation ratio, a computer device, and a storage medium.
Background
The current transformer is used as an instrument for converting a large current on the primary side into a small current on the secondary side for measurement, and can convert alternating currents of different devices into small currents in a certain proportion in the process of power generation, power transformation or power transmission, so that the current transformer can monitor the current of a measurement line and avoid high-voltage danger.
In the conventional technology, a primary side and a secondary side of a current transformer are respectively connected with a test device in a wired connection mode, and a metering chip in the test device is used for directly analyzing a collected analog current value of the primary side and an acquired analog current value of the secondary side to obtain a transformation ratio of the current transformer.
However, in the conventional technology, the test equipment directly calculates the transformation ratio of the current transformer according to the collected current values of the primary side and the secondary side of the current transformer, and the obtained test result is inaccurate.
Disclosure of Invention
In view of the above, it is necessary to provide a transformation ratio testing method, a transformation ratio testing device, a testing apparatus, and a storage medium, which can improve the accuracy of the transformation ratio testing result of the current transformer.
In a first aspect, a transformation ratio testing method is provided, which is applied to a transformation ratio testing system, and the transformation ratio testing system comprises a testing device, a first transformation ratio testing terminal arranged on a primary side of a transformer and a second transformation ratio testing terminal arranged on a secondary side of the transformer; the method comprises the following steps:
the test equipment respectively sends time synchronization instructions to the first transformation ratio test terminal and the second transformation ratio test terminal, and the time synchronization instructions are used for indicating the first transformation ratio test terminal and the second transformation ratio test terminal to synchronously sample the current on the cable to be tested;
the test equipment respectively receives a first sampling point number and a first current value which are obtained by the first transformation ratio test terminal, and a second sampling point number and a second current value which are obtained by the second transformation ratio test terminal; the first current value is a primary side current of the transformer, and the second current value is a secondary side current of the transformer;
the testing equipment judges whether the primary side current and the secondary side current of the mutual inductor are in phase or not according to the first sampling point number and the second sampling point number to obtain a judgment result;
the test equipment determines whether to determine the transformation ratio of the transformer according to the first current value and the second current value according to the judgment result.
In one embodiment, the test device respectively receives a first sampling point number and a first current value acquired by the first transformation ratio test terminal, and a second sampling point number and a second current value acquired by the second transformation ratio test terminal, and includes: the test equipment receives a first sampling point number and a first current value of the first transformation ratio test terminal in a first time period from the receiving time of the time synchronization instruction to the end of a preset first sine cycle; the test equipment receives a second sampling point number and a second current value of the second variable ratio test terminal in a second time period from the receiving time of the time synchronization command to the ending of a preset second sine cycle.
In one embodiment, the test device determines whether a primary side current and a secondary side current of the transformer are in phase according to the number of the first sampling points and the number of the second sampling points to obtain a determination result, including: and the test equipment judges whether the primary side current and the secondary side current of the mutual inductor are in phase or not according to the absolute difference value between the first sampling point number and the second sampling point number, so as to obtain a judgment result.
In one embodiment, the determining, by the testing device, whether a primary side current and a secondary side current of the transformer are in phase according to an absolute difference between the first sampling point number and the second sampling point number to obtain a determination result, includes: determining that the primary side current and the secondary side current of the transformer are in the same phase under the condition that the absolute difference is not greater than a first preset threshold or the absolute difference is not less than a second preset threshold; or determining that the primary side current and the secondary side current of the transformer are in the same phase under the condition that the absolute difference value is not smaller than a third preset threshold and not larger than a fourth preset threshold; the first preset threshold is smaller than the third preset threshold, the third preset threshold is smaller than the fourth preset threshold, and the fourth preset threshold is smaller than the second preset threshold.
In one embodiment, the testing device determines whether a primary side current and a secondary side current of the transformer are in phase according to an absolute difference between the first sampling point number and the second sampling point number to obtain a determination result, and further includes: determining that the primary side current and the secondary side current of the transformer are out of phase when the absolute difference value is larger than a first preset threshold and smaller than a third preset threshold; or determining that the primary side current and the secondary side current of the transformer are out of phase when the absolute difference value is larger than the fourth preset threshold and smaller than the second preset threshold.
In one embodiment, the sum of the first preset threshold and the second preset threshold is equal to the number of sampling points corresponding to the frequency of the power grid where the current transformer is located; the sum of the third preset threshold and the fourth preset threshold is equal to the number of sampling points corresponding to the frequency of the power grid where the current transformer is located.
In one embodiment, the determining, by the testing device, whether to determine the transformation ratio of the transformer according to the first current value and the second current value includes: and under the condition that the judgment result is in phase, determining the transformation ratio of the mutual inductor according to the ratio of the first current value and the second current value.
In one embodiment, the method further comprises: and if the judgment result is out of phase, outputting prompt information, wherein the prompt information is used for prompting a user to change the phase line of the cable connected with the first transformation ratio test terminal and/or the second transformation ratio test terminal.
In one embodiment, the method further comprises: the test equipment sends a first connection request to the first transformation ratio test terminal, wherein the first connection request carries an identifier of the first transformation ratio test terminal; the test equipment sends a second connection request to the second transformation ratio test terminal, wherein the second connection request carries the identifier of the second transformation ratio test terminal; the test equipment receives a first connection response sent by the first variable ratio test terminal and a second connection response sent by the second variable ratio test terminal so as to establish wireless connection between the test equipment and the first variable ratio test terminal and between the test equipment and the second variable ratio test terminal respectively.
In a second aspect, there is provided a transformation ratio testing apparatus, the apparatus comprising:
and the sending module is used for sending a time synchronization instruction to the first transformation ratio test terminal and the second transformation ratio test terminal respectively, and the time synchronization instruction is used for indicating the first transformation ratio test terminal and the second transformation ratio test terminal to synchronously sample the current on the cable to be tested.
The receiving module is used for respectively receiving a first sampling point number and a first current value which are obtained by the first transformation ratio testing terminal, and a second sampling point number and a second current value which are obtained by the second transformation ratio testing terminal; the first current value is a primary side current of the transformer, and the second current value is a secondary side current of the transformer.
And the judging module is used for judging whether the primary side current and the secondary side current of the mutual inductor are in phase or not according to the first sampling point number and the second sampling point number to obtain a judging result.
And the determining module is used for determining whether the transformation ratio of the mutual inductor is determined according to the first current value and the second current value according to the judgment result.
In a third aspect, a test apparatus is provided, comprising a memory, a processor, a transmitter and a receiver, the memory storing a computer program,
the transmitter is used for respectively transmitting a time synchronization instruction to the first transformation ratio test terminal and the second transformation ratio test terminal, and the time synchronization instruction is used for indicating the first transformation ratio test terminal and the second transformation ratio test terminal to synchronously sample the current on the cable to be tested;
the receiver is used for respectively receiving a first sampling point number and a first current value acquired by the first transformation ratio test terminal, and a second sampling point number and a second current value acquired by the second transformation ratio test terminal; the first current value is a primary side current of the mutual inductor, and the second current value is a secondary side current of the mutual inductor;
the processor executes a computer program for judging whether the primary side current and the secondary side current of the mutual inductor are in phase or not according to the first sampling point number and the second sampling point number to obtain a judgment result; and determining whether the transformation ratio of the mutual inductor is determined according to the first current value and the second current value according to the judgment result.
In a fourth aspect, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the method of any of the first aspects described above.
The transformation ratio testing method, the transformation ratio testing device, the testing equipment and the storage medium are applied to a transformation ratio testing system, wherein the transformation ratio testing system comprises the testing equipment, a first transformation ratio testing terminal arranged on the primary side of the mutual inductor and a second transformation ratio testing terminal arranged on the secondary side of the mutual inductor; the test equipment respectively sends time synchronization instructions to the first transformation ratio test terminal and the second transformation ratio test terminal, and the time synchronization instructions are used for indicating the first transformation ratio test terminal and the second transformation ratio test terminal to synchronously sample the current on the cable to be tested; the test equipment respectively receives a first sampling point number and a first current value which are obtained by the first transformation ratio test terminal, and a second sampling point number and a second current value which are obtained by the second transformation ratio test terminal; the first current value is a primary side current of the transformer, and the second current value is a secondary side current of the transformer; the testing equipment judges whether the primary side current and the secondary side current of the mutual inductor are in phase or not according to the first sampling point number and the second sampling point number to obtain a judgment result; the test equipment determines whether to determine the transformation ratio of the transformer according to the first current value and the second current value according to the judgment result; that is to say, in the embodiment of the present application, the testing device determines whether a primary side current and a secondary side current of the currently detected transformer are in phase according to a first number of sampling points acquired by the received first transformation ratio testing terminal and a second number of sampling points acquired by the second transformation ratio testing terminal, and determines the transformation ratio of the transformer according to a first current value acquired by the received first transformation ratio testing terminal and a second current value acquired by the second transformation ratio testing terminal under the condition that the primary side current and the secondary side current are in phase, where the calculation result is more accurate; for the fact that the transformation ratio of the current transformer is directly calculated according to the collected current values of the primary side and the secondary side of the current transformer in the prior art, the transformation ratio testing method of the current transformer in the embodiment of the application can improve the accuracy of the transformation ratio testing result of the current transformer.
Drawings
FIG. 1 is a diagram of an exemplary implementation of a transformation ratio testing method;
FIG. 2 is a schematic flow chart of a transformation ratio testing method in one embodiment;
FIG. 3 is a schematic flow chart of a ratio testing method in another embodiment;
FIG. 4a is a schematic diagram of sampling the primary-side current of a transformer according to an embodiment;
FIG. 4b is a schematic diagram of sampling the secondary side current of the transformer in one embodiment;
FIG. 5 is a schematic flow chart of a ratio testing method in another embodiment;
FIG. 6 is a block diagram of the structure of a transformation ratio testing device in one embodiment;
FIG. 7 is an internal block diagram of a test apparatus in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The transformation ratio test method provided by the application can be applied to a transformation ratio test system shown in fig. 1, and the transformation ratio test system comprises a test device 101, a first transformation ratio test terminal 102 arranged on the primary side of a transformer and a second transformation ratio test terminal 103 arranged on the secondary side of the transformer. The first transformation ratio test terminal 102 and the second transformation ratio test terminal 103 are respectively communicated with the test equipment 101 through a network; the testing device 101 may be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers, smart handheld terminals, and the like, on which software or hardware devices capable of analyzing and displaying the transformation ratio of the current transformer and testing devices capable of performing network communication with other terminals are mounted; the first transformation ratio test terminal 102 may be a transformation ratio test terminal capable of detecting a primary side current of a current transformer, the first transformation ratio test terminal 102 being used for detecting a large current on a cable of 600V or more, for example: the first transformation ratio test terminal 102 may be a high voltage split core current transformer; the second transformation ratio test terminal 103 may be a transformation ratio test terminal capable of detecting a secondary side current of the current transformer, the second transformation ratio test terminal 103 is used for detecting a small current on a cable of 600V or less, for example: the second transformation ratio test terminal 103 may be a low voltage split core current transformer.
In one embodiment, as shown in fig. 2, a transformation ratio testing method is provided, which is exemplified by the application of the method to the testing apparatus in fig. 1, and includes the following steps:
step 201, the test equipment sends a time synchronization instruction to the first and second transformation ratio test terminals, respectively, where the time synchronization instruction is used to instruct the first and second transformation ratio test terminals to synchronously sample the current on the cable to be tested.
When testing the transformation ratio of the current transformer, firstly, clamping the first transformation ratio test terminal and the second transformation ratio test terminal on a primary side cable and a secondary side cable of the current transformer respectively, and detecting the primary side current of the current transformer through the first transformation ratio test terminal and the secondary side current of the current transformer through the second transformation ratio test terminal respectively; the first and second transformation ratio test terminals are respectively connected with the test equipment, optionally, the first and second transformation ratio test terminals can be respectively connected with the test equipment in a wireless connection mode, so that the test equipment can control the first and second transformation ratio test terminals to respectively sample the current on the cable to be tested; the wireless connection may be a network connection capable of implementing short-range wireless communication, such as WiFi, bluetooth, LoRa, NB-IoT, which is not limited in this application.
In an optional embodiment of the present application, when controlling the first and second transformation ratio test terminals to sample the current on the cable to be tested, the test device may send a time synchronization instruction to the first and second transformation ratio test terminals, respectively, where the time synchronization instruction is used to instruct the first and second transformation ratio test terminals to sample the current on the cable to be tested synchronously.
Step 202, the testing equipment respectively receives a first sampling point number and a first current value obtained by the first transformation ratio testing terminal, and a second sampling point number and a second current value obtained by the second transformation ratio testing terminal; the first current value is a primary side current of the transformer, and the second current value is a secondary side current of the transformer.
The first sampling point number can be a first sampling point number obtained by the first transformation ratio testing terminal after sampling the alternating current on the primary side cable according to a preset sampling rule after receiving the time synchronization instruction, and the first sampling point number can indicate how many current values are collected by the first transformation ratio testing terminal under the preset sampling rule; the second sampling point number may be a second sampling point number obtained by the second transformation ratio testing terminal sampling the alternating current on the secondary side cable according to a preset sampling rule after receiving the time synchronization instruction, and the second sampling point number may indicate how many current values the second transformation ratio testing terminal has collected under the preset sampling rule.
Optionally, the first current value is a primary side current of the transformer, the primary side current may be a plurality of current values corresponding to the number of the first sampling points, and an effective current capable of representing the primary side cable is obtained by performing effective value operation on the plurality of current values; the second current value is a secondary side current of the transformer, the secondary side current can be a plurality of corresponding current values under the second sampling point number, and effective current capable of representing the secondary side cable is obtained by performing effective value operation on the plurality of current values; optionally, the first transformation ratio test terminal may include a first current detection module, the first current detection module may obtain the number of the first sampling points and the first current, and the second transformation ratio test terminal may include a second current detection module, the second current detection module may obtain the number of the second sampling points and the second current.
In an optional embodiment of the present application, a first wireless communication module may be further included in the first transformation ratio testing terminal, and the first wireless communication module and the first current detection module may communicate through a serial port; after the first transformation ratio test terminal acquires the number of the first sampling points and the first current, the number of the first sampling points and the first current can be sent to test equipment through the first wireless communication module; the second transformation ratio test terminal can also comprise a second wireless communication module, and the second wireless communication module and the second current detection module can communicate through a serial port; after the second transformation ratio test terminal obtains the second sampling point number and the second current, the second sampling point number and the second current can be sent to the test equipment through the second wireless communication module; the test equipment respectively receives a first sampling point number and a first current value which are obtained by the first transformation ratio test terminal, and a second sampling point number and a second current value which are obtained by the second transformation ratio test terminal.
And 203, the testing equipment judges whether the primary side current and the secondary side current of the mutual inductor are in phase according to the first sampling point number and the second sampling point number to obtain a judgment result.
When a user tests the transformation ratio of the mutual inductor, the user needs to clamp the first transformation ratio test terminal randomly on one phase cable of the multiple different phase lines on the primary side of the mutual inductor, and also needs to clamp the second transformation ratio test terminal randomly on one phase cable of the multiple different phase lines on the secondary side of the mutual inductor; when the transformation ratio of the mutual inductor is tested, the current on the cable with the same phase line needs to be collected, namely when the primary side current and the secondary side current of the mutual inductor are in-phase current, the transformation ratio of the mutual inductor is determined according to the primary side current and the secondary side current; alternatively, the transformation ratio of the transformer may be determined according to a ratio of the primary side current and the secondary side current; for example: the primary side of the transformer comprises three-phase cables A1, B1 and C1, the secondary side of the transformer comprises three-phase cables A2, B2 and C2, and when the transformation ratio of the transformer is tested, the transformation ratio of the transformer can be determined through the current of the cable A1 and the current of the cable A2.
In an optional embodiment of the present application, after receiving a first sampling point number and a first current of a primary side cable of a transformer sent by the first transformation ratio testing terminal, and a second sampling point number and a second current of a secondary side cable of the transformer sent by the second transformation ratio testing terminal, the testing device may determine, according to the first sampling point number and the second sampling point number, whether a current on the primary side cable and a current on the secondary side cable of the transformer currently tested are in phase, so as to obtain a determination result; optionally, a determination result may be obtained according to a preset in-phase and out-phase determination rule, the number of the first sampling points and the number of the second sampling points, where the determination result is that a current on a primary side cable and a current on a secondary side cable of the currently tested transformer are in phase, or a current on a primary side cable and a current on a secondary side cable of the currently tested transformer are out-of-phase; alternatively, the determination rule may be a mapping relationship that the first sampling point number and the second sampling point number correspond to the same phase or different phases in different ranges, for example: the number of first sample points is shown as being in phase in range a and the number of second sample points is shown as being in phase in range B.
And 204, determining whether the transformation ratio of the transformer is determined according to the first current value and the second current value or not by the testing equipment according to the judgment result.
As can be seen from the description of step 203, when the primary side current and the secondary side current of the transformer are in phase, that is, when the cable clamped on the primary side of the transformer and the cable clamped on the secondary side of the transformer are in-phase cables, the transformation ratio of the transformer is determined according to the primary side current and the secondary side current; that is, the test equipment determines whether to determine the transformation ratio of the transformer according to the first current value and the second current value according to the obtained judgment result; optionally, when the determination result is in phase, determining a transformation ratio of the transformer according to a ratio of the first current value to the second current value.
In the above-mentioned transformation ratio testing method, the testing device sends time synchronization instructions to the first transformation ratio testing terminal and the second transformation ratio testing terminal, respectively, where the time synchronization instructions are used to instruct the first transformation ratio testing terminal and the second transformation ratio testing terminal to synchronously sample the current on the cable to be tested; the test equipment respectively receives a first sampling point number and a first current value which are obtained by the first transformation ratio test terminal, and a second sampling point number and a second current value which are obtained by the second transformation ratio test terminal; the first current value is a primary side current of the transformer, and the second current value is a secondary side current of the transformer; the testing equipment judges whether the primary side current and the secondary side current of the mutual inductor are in phase or not according to the first sampling point number and the second sampling point number to obtain a judgment result; the test equipment determines whether to determine the transformation ratio of the transformer according to the first current value and the second current value according to the judgment result; that is to say, in the embodiment of the present application, the testing device determines whether a primary side current and a secondary side current of the currently detected transformer are in phase according to a first number of sampling points acquired by the received first transformation ratio testing terminal and a second number of sampling points acquired by the second transformation ratio testing terminal, and determines the transformation ratio of the transformer according to a first current value acquired by the received first transformation ratio testing terminal and a second current value acquired by the second transformation ratio testing terminal under the condition that the primary side current and the secondary side current are in phase, where the calculation result is more accurate; for the fact that the transformation ratio of the current transformer is directly calculated according to the collected current values of the primary side and the secondary side of the current transformer in the prior art, the transformation ratio testing method of the current transformer in the embodiment of the application can improve the accuracy of the transformation ratio testing result of the current transformer.
Fig. 3 is a schematic flow diagram of a ratio test method in another embodiment, where the embodiment relates to an optional implementation process in which a test device receives a first sampling point number and a first current value obtained by a first ratio test terminal, and a second sampling point number and a second current value obtained by a second ratio test terminal. On the basis of the above embodiment, as shown in fig. 3, the step 202 includes:
step 301, the test device receives a first sampling point number and the first current value in a first time period from the receiving time of the time synchronization command to the preset first sine cycle cutoff of the first transformation ratio test terminal.
In an optional embodiment of the present application, after receiving a time synchronization instruction sent by a test device, the first transformation ratio test terminal samples a waveform in a first time period from a receiving time of the time synchronization instruction to a cutoff time of a preset first sinusoidal cycle, so as to obtain a first sampling point number; optionally, when sampling the waveform in the first time period, the waveform in the first time period may be sampled at equal time according to a sampling rule that the number of sampling points of the 50Hz grid frequency is 160, so as to obtain a first number of sampling points and a first current value on the primary side of the transformer; for example: as shown in fig. 4a, the current waveform of the primary side cable of the current transformer acquired by the first transformation ratio testing terminal is 41, and the receiving time of the time synchronization command sent by the testing equipment received by the first transformation ratio testing terminal is T0The cutoff time of the preset first sine cycle is T1The waveform in a first time period from the receiving time of the time synchronization command to the ending time of a preset first sine cycle is 42, and the equal time sampling is carried out on the waveform 42 in the first time period, so that the number of first sampling points and the first current value of the primary side of the transformer can be obtained; the first transformation ratio test terminal sends the number of the first sampling points and the first current value to the test equipment which is connected withAnd receiving a first sampling point number and the first current value in a first time period from the receiving time of the time synchronization command to the ending of a preset first sine cycle by the first transformation ratio test terminal.
Optionally, before the first transformation ratio testing terminal obtains the number of the first sampling points and the first current value, the first transformation ratio testing terminal may further effectively determine the waveform of the current of the primary side cable of the transformer, that is, determine that the waveform of the current of the primary side cable is a corresponding normal waveform under the power grid frequency; optionally, the number of sampling points may be obtained by performing the above-mentioned equal-time sampling on the sine wave in one period, and if the number of the sampling points is within a preset normal value range, the current waveform may be determined to be an effective waveform; for example: the number of sampling points of the 50Hz power grid frequency is 160, the preset normal numerical range can be [157,164], when the number of sampling points in a complete sine cycle is in the numerical range, the sampling points can be judged to be effective waveforms, and the first number of sampling points and the first current value can be further obtained according to a time synchronization instruction; if the number of the sampling points is not within the numerical range, the current of the primary side cable at the moment can be judged to be abnormal, and the first transformation ratio test terminal can send the abnormal condition to test equipment through a wireless module so as to prompt a user that the current of the cable is abnormal.
Step 302, the test equipment receives a second sampling point number and the second current value of the second variable ratio test terminal in a second time period from the receiving time of the time synchronization command to the ending of a preset second sine cycle.
In an optional embodiment of the present application, after receiving a time synchronization instruction sent by a test device, the second transformation ratio test terminal samples a waveform in a second time period from a receiving time of the time synchronization instruction to a stop time of a preset second sinusoidal cycle, so as to obtain a second sampling point number; optionally, when sampling the waveform in the second time period, the waveform in the second time period is sampled equally according to the sampling rule that the number of sampling points of the grid frequency of 50Hz is 160, so as to obtain the number of second sampling points and the number of second sampling points on the secondary side of the transformerA second current value; for example: as shown in fig. 4b, the current waveform of the secondary side cable of the current transformer obtained by the second transformation ratio testing terminal is 43, and the receiving time of the time synchronization command sent by the testing equipment received by the second transformation ratio testing terminal is T0The preset second sine cycle has a cut-off time T2The waveform in a second time period from the receiving time of the time synchronization instruction to the cut-off time of a preset second sine cycle is 44, and the equal time sampling is carried out on the waveform 44 in the second time period, so that the number of second sampling points and a second current value on the secondary side of the transformer can be obtained; and the second transformation ratio test terminal sends the acquired second sampling point number and the second current value to the test equipment, and the test equipment receives the second sampling point number and the second current value of the second transformation ratio test terminal in a second time period from the receiving moment of the time synchronization instruction to the ending of a preset second sine cycle.
Optionally, before the second transformation ratio testing terminal obtains the second sampling point number and the second current value, the second transformation ratio testing terminal may also effectively judge the waveform of the current of the cable on the secondary side of the transformer, that is, judge that the waveform of the current of the cable on the secondary side is a corresponding normal waveform under the power grid frequency; the same determination process as the step 301 may be adopted, and the second sampling point number and the second current value may be further obtained according to the time synchronization instruction when the current waveform of the cable on the secondary side of the transformer is determined to be an effective waveform.
In this embodiment, the test device receives a first sampling point number and the first current value in a first time period from the receiving time of the time synchronization instruction to the preset first sine cycle expiration by the first variable ratio test terminal, and receives a second sampling point number and the second current value in a second time period from the receiving time of the time synchronization instruction to the preset second sine cycle expiration by the second variable ratio test terminal; sampling points and current values in a time period from the same moment to the cut-off of the sine cycle of the time are acquired by respectively acquiring the current of the primary side cable and the current of the secondary side cable of the mutual inductor, so that the primary side current and the secondary side current are ensured to be sampled in one cycle, and the sampling accuracy is improved.
In an optional embodiment of the present application, the testing device determines whether the primary side current and the secondary side current of the transformer are in phase according to the first sampling point number and the second sampling point number, and may also determine whether the primary side current and the secondary side current of the transformer are in phase according to an absolute difference between the first sampling point number and the second sampling point number, so as to obtain a determination result; that is, the difference between the first sampling point number and the second sampling point number is calculated and an absolute value is taken as an absolute difference value between the first sampling point number and the second sampling point number; alternatively, whether the phase is in phase or not is determined by the absolute difference value, and the following phase determination method may be employed.
On one hand, under the condition that the absolute difference is not larger than a first preset threshold or the absolute difference is not smaller than a second preset threshold, determining that the primary side current and the secondary side current of the transformer are in phase; or determining that the primary side current and the secondary side current of the transformer are in the same phase under the condition that the absolute difference value is not less than a third preset threshold and not more than a fourth preset threshold; the first preset threshold is smaller than the third preset threshold, the third preset threshold is smaller than the fourth preset threshold, and the fourth preset threshold is smaller than the second preset threshold; optionally, the sum of the first preset threshold and the second preset threshold may be equal to the number of sampling points corresponding to the frequency of the power grid where the current transformer is located; the sum of the third preset threshold and the fourth preset threshold can be equal to the number of sampling points corresponding to the frequency of the power grid where the current transformer is located; based on the above example, the sampling point number is 160 for the grid frequency of 50Hz, the first preset threshold may be 10, the second preset threshold may be 150, the third preset threshold may be 70, the fourth preset threshold may be 90, and the absolute difference value is represented by temp; that is, when temp is less than or equal to 10 or temp is greater than or equal to 150, i.e. the absolute difference is [0,10] or [150,160], it is determined that the primary side current and the secondary side current of the transformer are in phase, or when temp is greater than or equal to 70 and temp is less than or equal to 90, i.e. the absolute difference is [70,90], it is determined that the primary side current and the secondary side current of the transformer are in phase.
On the other hand, when the absolute difference value is larger than a first preset threshold and smaller than a third preset threshold, determining that the primary side current and the secondary side current of the transformer are out of phase; or determining that the primary side current and the secondary side current of the transformer are out of phase when the absolute difference value is larger than the fourth preset threshold and smaller than the second preset threshold; based on the above example, when temp >10 and temp <70, i.e., the absolute difference is at (10,70), it is determined that the primary-side current and the secondary-side current of the transformer are out of phase, or, when temp >90 and temp <150, i.e., the absolute difference is at (90,150), it is determined that the primary-side current and the secondary-side current of the transformer are out of phase.
In the embodiment of the application, the absolute difference value between the first sampling point number and the second sampling point number is obtained through the first sampling point number and the second sampling point number, and whether the primary side current and the secondary side current of the transformer are in phase or not is judged through the absolute difference value and the phase judgment method, so that the judgment result is obtained, and the accuracy of phase judgment can be greatly improved.
In an optional embodiment of the present application, when the determination result is in phase, determining a transformation ratio of the transformer according to a ratio of the first current value to the second current value; and under the condition that the judgment result is in phase, outputting prompt information, wherein the prompt information is used for prompting a user to change the phase line of the cable connected with the first transformation ratio testing terminal and/or the second transformation ratio testing terminal.
Fig. 5 is a schematic flowchart of a ratio testing method in another embodiment, which relates to an alternative implementation process of how a testing device establishes a connection with the first ratio testing terminal and the second ratio testing terminal respectively. On the basis of the above embodiment, as shown in fig. 5, the method further includes:
step 501, the test device sends a first connection request to the first transformation ratio test terminal, where the first connection request carries an identifier of the first transformation ratio test terminal.
Specifically, the test device may be wirelessly connected to the first transformation ratio test terminal, and the test device may send a first connection request to the first transformation ratio test terminal, where the first connection request carries an identifier of the first transformation ratio test terminal, and is used to indicate that the first transformation ratio test terminal is according to the identifier carried in the first connection request. And under the condition that the identification is identical to the identification of the test equipment, returning a first connection response to the test equipment to avoid establishing communication connection between other transformation ratio test terminals in the communication range and the test equipment.
Step 502, the test device sends a second connection request to the second transformation ratio test terminal, where the second connection request carries an identifier of the second transformation ratio test terminal.
Specifically, the test device may be wirelessly connected to the second variable ratio test terminal, and the test device may send a second connection request to the second variable ratio test terminal, where the second connection request carries an identifier of the second variable ratio test terminal, and is used to indicate that the second variable ratio test terminal performs connection according to the identifier carried in the second connection request. And under the condition that the identification is identical to the identification of the test equipment, returning a second connection response to the test equipment, and avoiding the other transformation ratio test terminals in the communication range from establishing communication connection with the test equipment.
Step 503, the test device receives a first connection response sent by the first transformation ratio test terminal and a second connection response sent by the second transformation ratio test terminal to establish wireless connection between the test device and the first transformation ratio test terminal and the second transformation ratio test terminal, respectively.
In this embodiment, the test device sends the first connection request to the first transformation ratio test terminal and sends the second connection request to the second transformation ratio test terminal, and wireless connections between the test device and the first transformation ratio test terminal and between the test device and the second transformation ratio test terminal are respectively established, so that the problem of inconvenient connection in a special environment due to wired connection in the conventional technology is avoided, and the convenience of connection between the test device and the first transformation ratio test terminal and between the test device and the second transformation ratio test terminal is improved.
It should be understood that although the various steps in the flow charts of fig. 2-5 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2-5 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps.
In one embodiment, as shown in fig. 6, there is provided a transformation ratio testing apparatus including: a sending module 601, a receiving module 602, a judging module 603 and a determining module 604, wherein:
the sending module 601 is configured to send a time synchronization instruction to the first and second transformation ratio test terminals, where the time synchronization instruction is used to instruct the first and second transformation ratio test terminals to synchronously sample a current on a cable to be tested.
A receiving module 602, configured to receive a first sampling point number and a first current value obtained by the first transformation ratio testing terminal, and a second sampling point number and a second current value obtained by the second transformation ratio testing terminal, respectively; the first current value is a primary side current of the transformer, and the second current value is a secondary side current of the transformer.
The judging module 603 is configured to judge whether the primary side current and the secondary side current of the transformer are in phase according to the first sampling point number and the second sampling point number, so as to obtain a judgment result.
And a determining module 604, configured to determine whether to determine a transformation ratio of the transformer according to the first current value and the second current value according to the determination result.
In one embodiment, the receiving module 602 is specifically configured to receive a first sampling point number and a first current value of the first transformation ratio test terminal in a first time period from a receiving time of the time synchronization command to a preset first sine cycle being terminated; receiving a second sampling point number and a second current value of the second variable ratio test terminal in a second time period from the receiving time of the time synchronization instruction to the ending of a preset second sine cycle; wherein, the period cut-off time of the first sinusoidal period and the second sinusoidal period is the same.
In one embodiment, the determining module 603 is specifically configured to determine whether the primary side current and the secondary side current of the transformer are in phase according to an absolute difference between the first sampling point number and the second sampling point number, so as to obtain a determination result.
In one embodiment, the determining module 603 is specifically configured to determine that the primary side current and the secondary side current of the transformer are in phase when the absolute difference is not greater than a first preset threshold or the absolute difference is not less than a second preset threshold; or determining that the primary side current and the secondary side current of the transformer are in the same phase under the condition that the absolute difference value is not smaller than a third preset threshold and not larger than a fourth preset threshold; the first preset threshold is smaller than the third preset threshold, the third preset threshold is smaller than the fourth preset threshold, and the fourth preset threshold is smaller than the second preset threshold.
In one embodiment, the determining module 603 is further configured to determine that the primary side current and the secondary side current of the transformer are out of phase when the absolute difference is greater than a first preset threshold and smaller than a third preset threshold; or determining that the primary side current and the secondary side current of the transformer are out of phase when the absolute difference value is larger than the fourth preset threshold and smaller than the second preset threshold.
In one embodiment, the sum of the first preset threshold and the second preset threshold is equal to the number of sampling points corresponding to the frequency of the power grid where the current transformer is located; the sum of the third preset threshold and the fourth preset threshold is equal to the number of sampling points corresponding to the frequency of the power grid where the current transformer is located.
In one embodiment, the determining module 604 is specifically configured to determine the transformation ratio of the transformer according to a ratio of the first current value and the second current value when the determination result is in phase.
In one embodiment, the apparatus further includes an output module, where the output module is configured to output a prompt message for prompting a user to change the phase line of the cable to which the first and/or second transformation ratio test terminal is connected if the determination result is out of phase.
In one embodiment, the sending module 601 is further configured to send a first connection request to the first variable ratio test terminal, where the first connection request carries an identifier of the first variable ratio test terminal, and send a second connection request to the second variable ratio test terminal, where the second connection request carries an identifier of the second variable ratio test terminal; the receiving module 602 is further configured to receive a first connection response sent by the first ratio-to-ratio test terminal and a second connection response sent by the second ratio-to-ratio test terminal, so as to establish wireless connections between the test device and the first ratio-to-ratio test terminal and between the test device and the second ratio-to-ratio test terminal.
For the specific definition of the ratio testing device, reference may be made to the above definition of the ratio testing method, which is not described herein again. The modules in the transformation ratio testing device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a test device, the internal structure of which may be as shown in fig. 7. The test equipment comprises a processor, a memory, a communication interface, a transmitter, a receiver, a display screen and an input device which are connected through a system bus. Wherein the processor of the test device is configured to provide computational and control capabilities. The memory of the test equipment comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface, the transmitter and the receiver of the test device are used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a transformation ratio testing method. The display screen of the test equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the test equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 7 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a test apparatus is provided comprising a memory, a processor, a transmitter, and a receiver, the memory having stored therein a computer program,
the transmitter is used for respectively transmitting a time synchronization instruction to the first transformation ratio test terminal and the second transformation ratio test terminal, and the time synchronization instruction is used for indicating the first transformation ratio test terminal and the second transformation ratio test terminal to synchronously sample the current on the cable to be tested;
the receiver is used for respectively receiving a first sampling point number and a first current value acquired by the first transformation ratio test terminal, and a second sampling point number and a second current value acquired by the second transformation ratio test terminal; the first current value is a primary side current of the mutual inductor, and the second current value is a secondary side current of the mutual inductor;
the processor executes a computer program for judging whether the primary side current and the secondary side current of the mutual inductor are in phase or not according to the first sampling point number and the second sampling point number to obtain a judgment result; and determining whether the transformation ratio of the mutual inductor is determined according to the first current value and the second current value according to the judgment result.
In one embodiment, the receiver is specifically configured to receive a first sampling point number and a first current value of the first variable ratio test terminal in a first time period from a receiving time of the time synchronization command to a preset first sine cycle expiration; and receiving a second sampling point number and a second current value of the second variable ratio test terminal in a second time period from the receiving time of the time synchronization command to the ending of a preset second sine cycle.
In an embodiment, the processor is specifically configured to determine whether a primary side current and a secondary side current of the transformer are in phase according to an absolute difference between the first sampling point number and the second sampling point number, so as to obtain a determination result.
In an embodiment, the processor is specifically configured to determine that the primary side current and the secondary side current of the transformer are in phase when the absolute difference is not greater than a first preset threshold or the absolute difference is not less than a second preset threshold; or determining that the primary side current and the secondary side current of the transformer are in the same phase under the condition that the absolute difference value is not smaller than a third preset threshold and not larger than a fourth preset threshold; the first preset threshold is smaller than the third preset threshold, the third preset threshold is smaller than the fourth preset threshold, and the fourth preset threshold is smaller than the second preset threshold.
In an embodiment, the processor is specifically configured to determine that the primary side current and the secondary side current of the transformer are out of phase when the absolute difference is greater than a first preset threshold and smaller than a third preset threshold; or determining that the primary side current and the secondary side current of the transformer are out of phase when the absolute difference value is larger than the fourth preset threshold and smaller than the second preset threshold.
In one embodiment, the sum of the first preset threshold and the second preset threshold is equal to the number of sampling points corresponding to the frequency of the power grid where the current transformer is located; the sum of the third preset threshold and the fourth preset threshold is equal to the number of sampling points corresponding to the frequency of the power grid where the current transformer is located.
In an embodiment, the processor is specifically configured to determine a transformation ratio of the transformer according to a ratio of the first current value to the second current value when the determination result is in phase.
In one embodiment, the processor is further configured to output a prompt message for prompting a user to change the phase line of the cable to which the first and/or second variable ratio test terminal is connected if the determination result is out of phase.
In an embodiment, the transmitter is specifically configured to send a first connection request to the first variable ratio test terminal, where the first connection request carries an identifier of the first variable ratio test terminal; sending a second connection request to the second variable ratio test terminal, wherein the second connection request carries the identifier of the second variable ratio test terminal; the receiver is specifically configured to receive a first connection response sent by the first variable ratio test terminal and a second connection response sent by the second variable ratio test terminal, so as to establish wireless connections between the test device and the first variable ratio test terminal and between the test device and the second variable ratio test terminal, respectively.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
respectively sending a time synchronization instruction to the first transformation ratio test terminal and the second transformation ratio test terminal, wherein the time synchronization instruction is used for indicating the first transformation ratio test terminal and the second transformation ratio test terminal to synchronously sample the current on the cable to be tested;
respectively receiving a first sampling point number and a first current value acquired by the first transformation ratio test terminal, and a second sampling point number and a second current value acquired by the second transformation ratio test terminal; the first current value is a primary side current of the transformer, and the second current value is a secondary side current of the transformer;
judging whether the primary side current and the secondary side current of the transformer are in phase or not according to the first sampling point number and the second sampling point number to obtain a judgment result;
and determining whether the transformation ratio of the transformer is determined according to the first current value and the second current value according to the judgment result.
In one embodiment, the computer program when executed by the processor further performs the steps of: receiving a first sampling point number and a first current value of the first transformation ratio test terminal in a first time period from the receiving time of the time synchronization instruction to the ending of a preset first sine cycle; receiving a second sampling point number and a second current value of the second variable ratio test terminal in a second time period from the receiving time of the time synchronization instruction to the end of a preset second sine cycle; wherein, the period cut-off time of the first sinusoidal period and the second sinusoidal period is the same.
In one embodiment, the computer program when executed by the processor further performs the steps of: and judging whether the primary side current and the secondary side current of the mutual inductor are in phase or not according to the absolute difference value between the first sampling point number and the second sampling point number, and obtaining a judgment result.
In one embodiment, the computer program when executed by the processor further performs the steps of: determining that the primary side current and the secondary side current of the transformer are in the same phase under the condition that the absolute difference is not greater than a first preset threshold or the absolute difference is not less than a second preset threshold; or determining that the primary side current and the secondary side current of the transformer are in the same phase under the condition that the absolute difference value is not smaller than a third preset threshold and not larger than a fourth preset threshold; the first preset threshold is smaller than the third preset threshold, the third preset threshold is smaller than the fourth preset threshold, and the fourth preset threshold is smaller than the second preset threshold.
In one embodiment, the computer program when executed by the processor further performs the steps of: determining that the primary side current and the secondary side current of the transformer are out of phase when the absolute difference value is larger than a first preset threshold and smaller than a third preset threshold; or determining that the primary side current and the secondary side current of the transformer are out of phase when the absolute difference value is larger than the fourth preset threshold and smaller than the second preset threshold.
In one embodiment, the computer program when executed by the processor further performs the steps of: the sum of the first preset threshold and the second preset threshold is equal to the number of sampling points corresponding to the frequency of the power grid where the current transformer is located; the sum of the third preset threshold and the fourth preset threshold is equal to the number of sampling points corresponding to the frequency of the power grid where the current transformer is located.
In one embodiment, the computer program when executed by the processor further performs the steps of: and under the condition that the judgment result is in phase, determining the transformation ratio of the mutual inductor according to the ratio of the first current value and the second current value.
In one embodiment, the computer program when executed by the processor further performs the steps of: and if the judgment result is out of phase, outputting prompt information, wherein the prompt information is used for prompting a user to change the phase line of the cable connected with the first transformation ratio test terminal and/or the second transformation ratio test terminal.
In one embodiment, the computer program when executed by the processor further performs the steps of: sending a first connection request to the first transformation ratio test terminal, wherein the first connection request carries an identifier of the first transformation ratio test terminal; sending a second connection request to the second transformation ratio test terminal, wherein the second connection request carries the identifier of the second transformation ratio test terminal; and receiving a first connection response sent by the first variable ratio test terminal and a second connection response sent by the second variable ratio test terminal to establish wireless connection between the test equipment and the first variable ratio test terminal and the second variable ratio test terminal respectively.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (12)

1. The transformation ratio testing method is characterized by being applied to a transformation ratio testing system, wherein the transformation ratio testing system comprises testing equipment, a first transformation ratio testing terminal arranged on the primary side of a mutual inductor and a second transformation ratio testing terminal arranged on the secondary side of the mutual inductor; the method comprises the following steps:
the test equipment respectively sends time synchronization instructions to the first transformation ratio test terminal and the second transformation ratio test terminal, and the time synchronization instructions are used for indicating the first transformation ratio test terminal and the second transformation ratio test terminal to synchronously sample the current on the cable to be tested;
the test equipment respectively receives a first sampling point number and a first current value which are obtained by the first transformation ratio test terminal, and a second sampling point number and a second current value which are obtained by the second transformation ratio test terminal; the first current value is a primary side current of the transformer, and the second current value is a secondary side current of the transformer;
the testing equipment judges whether the primary side current and the secondary side current of the mutual inductor are in phase or not according to the first sampling point number and the second sampling point number to obtain a judgment result;
and the test equipment determines whether to determine the transformation ratio of the mutual inductor according to the first current value and the second current value according to the judgment result.
2. The method of claim 1, wherein the test equipment respectively receives a first sampling point number and a first current value obtained by the first transformation ratio test terminal, and a second sampling point number and a second current value obtained by the second transformation ratio test terminal, and comprises:
the test equipment receives the first sampling point number and the first current value of the first transformation ratio test terminal in a first time period from the receiving time of the time synchronization instruction to the ending of a preset first sine cycle;
and the test equipment receives the second sampling point number and the second current value of the second transformation ratio test terminal in a second time period from the receiving moment of the time synchronization instruction to the ending of a preset second sine cycle.
3. The method of claim 2, wherein the testing device determines whether the primary side current and the secondary side current of the transformer are in phase according to the first sampling point number and the second sampling point number to obtain a determination result, and the determining comprises:
and the test equipment judges whether the primary side current and the secondary side current of the mutual inductor are in phase or not according to the absolute difference value between the first sampling point number and the second sampling point number, so as to obtain a judgment result.
4. The method of claim 3, wherein the determining, by the testing device, whether the primary side current and the secondary side current of the transformer are in phase according to an absolute difference between the first sampling point number and the second sampling point number to obtain a determination result comprises:
if the absolute difference value is not greater than a first preset threshold value or the absolute difference value is not less than a second preset threshold value, determining that the primary side current and the secondary side current of the transformer are in the same phase;
alternatively, the first and second electrodes may be,
if the absolute difference value is not smaller than a third preset threshold and not larger than a fourth preset threshold, determining that the primary side current and the secondary side current of the transformer are in the same phase;
the first preset threshold is smaller than the third preset threshold, the third preset threshold is smaller than the fourth preset threshold, and the fourth preset threshold is smaller than the second preset threshold.
5. The method of claim 4, wherein the testing device determines whether the primary side current and the secondary side current of the transformer are in phase according to an absolute difference between the first sampling point number and the second sampling point number to obtain a determination result, further comprising:
if the absolute difference value is larger than a first preset threshold and smaller than a third preset threshold, determining that the primary side current and the secondary side current of the transformer are out of phase;
alternatively, the first and second electrodes may be,
and if the absolute difference is larger than the fourth preset threshold and smaller than the second preset threshold, determining that the primary side current and the secondary side current of the transformer are out of phase.
6. The method according to claim 4 or 5, wherein the sum of the first preset threshold and the second preset threshold is equal to the number of sampling points corresponding to the frequency of the power grid where the current transformer is located;
the sum of the third preset threshold and the fourth preset threshold is equal to the number of sampling points corresponding to the frequency of the power grid where the current transformer is located.
7. The method according to claim 4 or 5, wherein the determining, by the testing device, whether to determine the transformation ratio of the transformer according to the first current value and the second current value according to the determination result comprises:
and if the judgment result is in phase, determining the transformation ratio of the mutual inductor according to the ratio of the first current value to the second current value.
8. The method of claim 7, further comprising:
and if the judgment result is out of phase, outputting prompt information, wherein the prompt information is used for prompting a user to change the phase line of the cable connected with the first transformation ratio testing terminal and/or the second transformation ratio testing terminal.
9. The method of claim 1, further comprising:
the test equipment sends a first connection request to the first transformation ratio test terminal, wherein the first connection request carries an identifier of the first transformation ratio test terminal;
the test equipment sends a second connection request to the second transformation ratio test terminal, wherein the second connection request carries an identifier of the second transformation ratio test terminal;
and the test equipment receives a first connection response sent by the first variable ratio test terminal and a second connection response sent by the second variable ratio test terminal so as to establish wireless connection between the test equipment and the first variable ratio test terminal and between the test equipment and the second variable ratio test terminal respectively.
10. A ratio testing apparatus, the apparatus comprising:
the sending module is used for sending time synchronization instructions to the first transformation ratio testing terminal and the second transformation ratio testing terminal respectively, and the time synchronization instructions are used for indicating the first transformation ratio testing terminal and the second transformation ratio testing terminal to synchronously sample the current on the cable to be tested;
the receiving module is used for respectively receiving a first sampling point number and a first current value which are obtained by the first transformation ratio testing terminal, and a second sampling point number and a second current value which are obtained by the second transformation ratio testing terminal; the first current value is a primary side current of the transformer, and the second current value is a secondary side current of the transformer;
the judging module is used for judging whether the primary side current and the secondary side current of the mutual inductor are in phase or not according to the first sampling point number and the second sampling point number to obtain a judging result;
and the determining module is used for determining whether the transformation ratio of the mutual inductor is determined according to the first current value and the second current value according to the judgment result.
11. A test apparatus comprising a memory, a processor, a transmitter and a receiver, the memory storing a computer program, characterized in that,
the transmitter is configured to send a time synchronization instruction to the first and second transformation ratio test terminals, where the time synchronization instruction is used to instruct the first and second transformation ratio test terminals to synchronously sample a current on a cable to be tested;
the receiver is used for respectively receiving a first sampling point number and a first current value acquired by the first transformation ratio test terminal, and a second sampling point number and a second current value acquired by the second transformation ratio test terminal; the first current value is a primary side current of the transformer, and the second current value is a secondary side current of the transformer;
the processor executes a computer program, and is used for judging whether the primary side current and the secondary side current of the mutual inductor are in phase or not according to the first sampling point number and the second sampling point number to obtain a judgment result; and determining whether the transformation ratio of the mutual inductor is determined according to the first current value and the second current value according to the judgment result.
12. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 9.
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