CN109738714B

CN109738714B - Secondary phase checking method and device

Info

Publication number: CN109738714B
Application number: CN201910213135.9A
Authority: CN
Inventors: 张韶光; 贾荣正; 尚柳; 渠红涛; 张坤; 王会增; 张岩坡; 王亚强; 王永红; 马宜军; 王昭雷
Original assignee: State Grid Corp of China SGCC; Maintenance Branch of State Grid Hebei Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; Maintenance Branch of State Grid Hebei Electric Power Co Ltd
Priority date: 2019-03-20
Filing date: 2019-03-20
Publication date: 2021-04-13
Anticipated expiration: 2039-03-20
Also published as: CN109738714A

Abstract

The invention is suitable for the technical field of transformer substations, and provides a secondary nuclear phase method and a secondary nuclear phase device, wherein the method comprises the following steps: acquiring three-phase voltage data of a current operating line, acquiring three-phase voltage data of new equipment sent by an auxiliary meter end in a wireless mode, and judging whether the three-phase voltage data of the new equipment and the three-phase voltage data of the current operating line both accord with preset reference conditions; and if so, determining whether the voltage phases of the new equipment and the current operating line are consistent or not according to the three-phase voltage data of the current operating line and the three-phase voltage data of the new equipment. According to the invention, the trouble of long cable wiring phase checking can be avoided through a wireless communication mode of the main meter end and the auxiliary meter end, and the phase checking of the new equipment and the current operating line is carried out after the three-phase voltage data at the two ends respectively meet the preset reference conditions, so that whether the voltage phase of the new equipment and the current operating line is consistent or not is determined, and the accuracy of secondary phase checking can be ensured.

Description

Secondary phase checking method and device

Technical Field

The invention belongs to the technical field of transformer substations, and particularly relates to a secondary nuclear phase method and a secondary nuclear phase device.

Background

Before a newly built line and a transformer in a transformer substation are put into operation, the secondary voltage phase of a voltage transformer of new equipment must be consistent with the system voltage phase. In the operation process of a newly-built substation or a newly-built line, before new equipment is electrified and is not loaded, the secondary voltage of the new equipment needs to be subjected to phase checking, and the action of a relay protection device caused by the phase error of the secondary voltage after the new equipment is loaded is prevented. The secondary phase checking means that whether the three-phase voltage phase of the new equipment is completely consistent with the three-phase of the equipment already operated in the transformer substation or not is checked at the secondary side of the voltage transformer, and the new equipment is not allowed to be connected into a system under load if the three-phase voltage phase of the new equipment is inconsistent with the three-phase of the equipment already operated in the transformer.

The secondary voltage of equipment in the transformer substation is often led out from the secondary side of a voltage transformer and is connected into a voltage switching screen in a relay protection room through a cable, so that the phase checking work is usually performed between the voltage switching screen of new equipment and the voltage switching screen of a certain operation line in the transformer substation. In view of the practical situation, the distance between the new device and the voltage switching screen of a certain operation line is often far, even the new device is not in a relay protection room, in order to carry out phase checking work, a temporary long cable needs to be placed between the two voltage switching screens, the voltage of the new device is led into the voltage switching screen of the selected operation line from the voltage switching screens, and then the alternating current voltage gear of the multimeter is utilized to check the phase by phase. The method has large workload, and relay protection professionals need to spend a large amount of time on secondary check and phase correction.

Disclosure of Invention

In view of this, embodiments of the present invention provide a method and an apparatus for secondary nuclear phase, so as to solve the problems of large workload, long time consumption and low efficiency of secondary nuclear phase in the prior art.

The first aspect of the embodiments of the present invention provides a secondary phase checking method, applied to a main table terminal, including:

the method comprises the steps of obtaining three-phase voltage data of a current operating line, and obtaining three-phase voltage data of new equipment sent by an auxiliary meter end in a wireless mode, wherein the three-phase voltage data of the new equipment is the three-phase voltage data meeting preset reference conditions;

judging whether the phase difference and the amplitude of the three-phase voltage data of the current operating line meet the preset reference condition or not;

and if the phase difference and the amplitude of the three-phase voltage data of the current operating line meet preset reference conditions, determining whether the voltage phase of the new equipment is consistent with the voltage phase of the current operating line according to the three-phase voltage data of the current operating line and the three-phase voltage data of the new equipment.

A second aspect of the embodiments of the present invention provides a secondary phase checking method, applied to a secondary table, including:

acquiring three-phase voltage data of new equipment;

judging whether the phase difference and the amplitude of the three-phase voltage data of the new equipment meet preset reference conditions or not;

and if the phase difference and the amplitude of the three-phase voltage data of the new equipment meet preset reference conditions, sending the three-phase voltage data of the new equipment to a main meter end.

A third aspect of the embodiments of the present invention provides a secondary phase-checking device, applied to a main table terminal, including:

the voltage data acquisition module is used for acquiring three-phase voltage data of a current operating line and acquiring three-phase voltage data of new equipment, which is sent by the auxiliary meter end in a wireless mode, wherein the three-phase voltage data of the new equipment is the three-phase voltage data meeting preset reference conditions;

the reference condition judgment module is used for judging whether the phase difference and the amplitude of the three-phase voltage data of the current operating line meet the preset reference condition or not;

and the secondary phase checking module is used for determining whether the voltage phase of the new equipment is consistent with the voltage phase of the current operating line according to the three-phase voltage data of the current operating line and the three-phase voltage data of the new equipment if the phase difference and the amplitude of the three-phase voltage data of the current operating line meet preset reference conditions.

A fourth aspect of the embodiments of the present invention provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the secondary nuclear phase method as described above when executing the computer program.

A fifth aspect of embodiments of the present invention provides a computer-readable storage medium, which stores a computer program that, when executed by a processor, implements the steps of the secondary nuclear phase method as described above.

Compared with the prior art, the embodiment of the invention has the following beneficial effects: the method comprises the steps of firstly obtaining three-phase voltage data of a current operating line, and obtaining three-phase voltage data of new equipment, which is sent by an auxiliary meter end in a wireless mode; then judging whether the phase difference and the amplitude of the three-phase voltage data of the current operating line meet the preset reference condition or not; and if the phase difference and the amplitude of the three-phase voltage data of the current operating line meet preset reference conditions, determining whether the voltage phase of the new equipment is consistent with the voltage phase of the current operating line according to the three-phase voltage data of the current operating line and the three-phase voltage data of the new equipment. According to the embodiment of the invention, the three-phase voltage data of the new equipment is acquired through the auxiliary meter end, the preset condition is judged, and then the three-phase voltage data is sent to the main meter end in a wireless communication mode, so that the working link of temporarily placing a long cable is avoided, the three-phase voltage data of the new equipment and the current operating line are respectively judged in the corresponding meter ends according to the preset condition, the phenomenon of partial wiring error in the construction process or wiring error of a test instrument in the phase checking process is avoided, the phase checking of the new equipment and the current operating line is carried out after the three-phase voltage data at the two ends respectively meet the preset reference condition, and therefore, whether the phase of the new equipment and the voltage of the current operating line are consistent or not is determined, and the accuracy of secondary phase checking can.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a secondary nuclear phase system according to an embodiment of the present invention;

fig. 2 is a schematic flow chart of an implementation of a secondary nuclear phase method according to an embodiment of the present invention;

fig. 3 is a schematic flow chart of S202 in fig. 2 according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of three-phase voltage phases provided by an embodiment of the present invention;

fig. 5 is a schematic flowchart of S301 in fig. 3 according to an embodiment of the present invention;

fig. 6 is a schematic flowchart of S203 in fig. 2 according to an embodiment of the present invention;

fig. 7 is a schematic flowchart of S602 in fig. 6 according to an embodiment of the present invention;

fig. 8 is a schematic flowchart of S605 in fig. 6 according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a secondary nuclear phase system according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a terminal device according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of the A-phase voltage waveform of the new apparatus and the currently operating line provided by the embodiment of the present invention;

FIG. 12 is a schematic diagram of an error value vector according to an embodiment of the present invention.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

In order to explain the technical means of the present invention, the following description will be given by way of specific examples.

Example one

As shown in fig. 1, fig. 1 shows a structure of a secondary nuclear phase system 1 according to an embodiment of the present invention, which includes: the main meter end 11 is arranged at a current operation equipment end, the auxiliary meter end 12 is arranged at a new equipment end, the main meter end 11 and the auxiliary meter end 12 are in wireless communication, the main meter end 11 and the auxiliary meter end 12 respectively comprise four meter pens, the four meter pens of the main meter end 11 are respectively connected into a terminal row A, B, C, N in a voltage switching screen 13 of a current operation line, three-phase voltage data of a secondary coil of the current operation line are collected, the four meter pens of the auxiliary meter end 12 are respectively connected into a terminal row A, B, C, N in a voltage switching screen 14 of a new equipment secondary side, and three-phase voltage data of a voltage transformer secondary side of the new equipment are collected. The four pens can be set to different colors, specifically, the colors of the pens corresponding to A, B, C, N four terminals are yellow, green, red and black respectively. The meter pen N is connected to a neutral point of new equipment or a current operating line, and the main meter end 11 and the auxiliary meter end 12 detect AN A-phase voltage between AN terminals, a B-phase voltage between BN terminals and a C-phase voltage between CN terminals through four meter pens respectively.

Fig. 2 shows an implementation process of a secondary nuclear phase method according to an embodiment of the present invention, where a process execution main body of the embodiment may be a main table 11, and a process of the embodiment is detailed as follows:

s201: the method comprises the steps of obtaining three-phase voltage data of a current operation line, and obtaining three-phase voltage data of new equipment sent by an auxiliary meter end 12 in a wireless mode, wherein the three-phase voltage data of the new equipment is the three-phase voltage data meeting preset reference conditions.

In this embodiment, the main meter terminal 11 obtains three-phase voltage data of a currently running line through four meter pens, the three-phase voltage data respectively includes a-phase voltage data, B-phase voltage data and C-phase voltage data, the three-phase voltage data is an analog quantity, the auxiliary meter terminal 12 obtains three-phase voltage data of a secondary mutual transformer of new equipment through the four meter pens, and judges whether amplitude and phase difference of the three-phase voltage data of the new equipment both meet preset reference conditions, if yes, the three-phase voltage data meeting the preset reference conditions are converted from the analog quantity to a digital quantity, and the three-phase voltage data of the digital quantity are sent to the main meter terminal 11, if not, whether wiring between a corresponding terminal row of the voltage switching screen and a secondary side of a voltage transformer body of the new equipment is faulty is checked, and the three-phase voltage data of the new equipment are collected again after no fault is detected until the amplitude and the phase difference of the three-phase voltage data of the new equipment meet the, the three-phase voltage data that meets the preset reference condition is converted from an analog quantity to a digital quantity, and the three-phase voltage data of the digital quantity is transmitted to the main meter terminal 11.

When the main meter terminal 11 acquires the three-phase voltage data of the new device sent by the auxiliary meter terminal 12, the three-phase voltage data of the new device is converted from digital quantity to analog quantity.

S202: and judging whether the phase difference and the amplitude of the three-phase voltage data of the current operating line meet the preset reference conditions or not.

In this embodiment, after the main meter end 11 obtains the three-phase voltage data of the currently operating line, it is also necessary to determine whether the phase difference and the amplitude of the three-phase voltage data of the currently operating line meet preset reference conditions, if yes, the subsequent steps are continued, if not, whether a test connection between the main meter end 11 and the voltage switching screen terminal row of the currently operating line is faulty is detected, and the three-phase voltage data of the currently operating line is collected again after the detection is faulty.

S203: and if the phase difference and the amplitude of the three-phase voltage data of the current operating line meet preset reference conditions, determining whether the voltage phase of the new equipment is consistent with the voltage phase of the current operating line according to the three-phase voltage data of the current operating line and the three-phase voltage data of the new equipment.

In this embodiment, whether the three-phase voltage data of the currently operating line is consistent with the three-phase voltage data of the new device or not is checked, and if so, it is determined that the new device is successfully phase checked, and the new device can be connected to the currently operating line under load. And if the current operation line is inconsistent with the new operation line, the new equipment can not be accessed to the current operation line with load.

As can be seen from the above embodiments, in the embodiments of the present invention, the three-phase voltage data of the current operating line is obtained first, and the three-phase voltage data of the new device, which is sent by the sub-meter 12 in a wireless manner, is obtained; then judging whether the phase difference and the amplitude of the three-phase voltage data of the current operating line meet the preset reference condition or not; and if the phase difference and the amplitude of the three-phase voltage data of the current operating line meet preset reference conditions, determining whether the voltage phase of the new equipment is consistent with the voltage phase of the current operating line according to the three-phase voltage data of the current operating line and the three-phase voltage data of the new equipment. According to the invention, the three-phase voltage data of the new equipment is obtained through the auxiliary meter end 12, and the three-phase voltage data meeting the preset conditions are sent to the main meter end 11 in a wireless communication mode, so that the working link of placing an temporary long cable is avoided, the three-phase voltage data of the new equipment and the three-phase voltage data of the current operating line are respectively judged according to the preset conditions at the corresponding meter ends, the phenomenon of partial wiring errors in the construction process or wiring errors of a test instrument in the phase checking process is avoided, the phase checking of the new equipment and the current operating line is carried out after the three-phase voltage data at the two ends respectively meet the preset reference conditions, and thus whether the voltage phases of the new equipment and the current operating line are consistent or not is determined, and the accuracy of secondary phase checking can.

In this embodiment, before performing the secondary phase checking, the main table terminal 11 and the sub table terminal 12 need to be paired to ensure that the time of the main table terminal 11 and the time of the sub table terminal 12 are consistent during the phase checking. To ensure the accuracy of the phasing result, the relative time error of the primary and secondary tables 11 and 12 is preferably less than or equal to 1 ms. The data compared by the main meter end 11 and the auxiliary meter end 12 are at the same acquisition time.

In this embodiment, the three-phase voltage data includes a three-phase voltage instantaneous value and an acquisition time, and a specific implementation process of S201 in fig. 2 includes:

and acquiring a preset number of three-phase voltage instantaneous values of the current operating line according to a preset sampling period, and recording the acquisition time of each three-phase voltage instantaneous value of the current operating line.

In this embodiment, in order to ensure the accuracy of the secondary phase checking, a preset number of three-phase voltage instantaneous values of the current operating line may be collected according to a preset sampling period, so that the secondary phase checking is performed according to the preset number of three-phase voltage instantaneous values, and a phenomenon that the error occurs in the three-phase voltage instantaneous values at a certain moment to cause a phase checking error is avoided. Alternatively, the preset sampling period may be 1ms, the preset number may be 20, and the three-phase voltage instantaneous values of one currently operating line are collected every 1ms, so as to obtain 20 three-phase voltage instantaneous values.

In the present embodiment, similarly, the sub-table 12 and the main table 11 have the same preset sampling period and the same preset number.

Further, in order to ensure that the data compared by the main meter end 11 and the sub meter end 12 are acquired to the same time, the acquisition time for acquiring the three-phase voltage instantaneous value each time needs to be recorded, and each acquisition time is marked at the corresponding three-phase voltage instantaneous value, so that the three-phase voltage instantaneous values compared by the main meter end 11 and the sub meter end 12 are ensured to be under the same time mark according to the acquisition time, and the accuracy of secondary phase checking is ensured.

As shown in fig. 3, in an embodiment of the present invention, the three-phase voltage data further includes a three-phase voltage effective value and a three-phase voltage instantaneous value, and the preset reference condition includes a preset phase difference reference range and a preset amplitude reference range; fig. 3 shows a specific implementation flow of S202 in fig. 2, and the process thereof is detailed as follows:

s301: and calculating the phase difference and the three-phase voltage effective value of the three-phase voltage instantaneous value of the current operating line, which are arranged at two-to-two intervals, according to the three-phase voltage instantaneous value of each acquisition time of the current operating line.

In the present embodiment, the first and second light sources can be turned on and off

Calculating the effective value of the three-phase voltage; in the formula (1), U_AtEffective value of A-phase voltage, U, representing currently operating line_BtEffective value of B-phase voltage, U, representing currently running line_CtRepresenting the C-phase voltage of the currently operating lineEffective value, U_AtiRepresenting the instantaneous value of the A-phase voltage, U, of the currently operating line at the ith acquisition time_BtiRepresenting the instantaneous value of the B-phase voltage, U, of the currently running line at the ith acquisition time_CtiAnd m represents a preset number, and represents the instantaneous value of the C-phase voltage of the current running line at the ith acquisition time.

In this embodiment, the three-phase voltage effective value of the new device may also be calculated by the above method.

In this embodiment, the phase difference between the AB phase, the BC phase and the CA phase is calculated from the instantaneous values of the three-phase voltages.

In this embodiment, fig. 5 shows a specific process of calculating the phase difference between two phases of the currently operating line in step S301 in fig. 3, which includes:

s501: and calculating a three-phase voltage phase angle corresponding to each acquisition moment of the current operating line according to the three-phase voltage instantaneous value of each acquisition moment of the current operating line.

In particular by calculation

Obtaining the corresponding three-phase voltage phase angle of each acquisition time of the current running line, wherein in the formula (2),

representing the phase angle of the ith acquisition time of the A-phase voltage of the current operating line,

representing the phase angle of the ith acquisition time of the B-phase voltage of the current operating line,

and the phase angle of the ith acquisition moment of the C-phase voltage of the current running line is represented.

S502: and calculating a phase difference initial value of a first phase at each acquisition time of the current operating line according to the three-phase voltage phase angle at each acquisition time of the current operating line, wherein the first phase is any one of two phases of the three phases of the current operating line.

In the present embodiment, by calculation

And obtaining the phase difference between every two phases. In the formula (3), the reaction mixture is,

representing the phase angle difference of the AB phase-to-phase voltage i moment of the current operating line,

represents the phase angle difference of the BC phase-to-phase voltage i moment of the current operation line,

and the phase angle difference of the CA phase-to-phase voltage i moment of the current operation line is shown.

S503: averaging the initial values of the phase difference between the first phases at each acquisition time of the current operating line to obtain the phase difference between the first phases of the current operating line.

In the present embodiment, by calculation

And obtaining the phase difference between every two current running lines. In the formula (4), the reaction mixture is,

representing the phase difference between the AB phases of the currently operating line,

represents the phase difference between the BC phases of the currently operating line,

representing the phase difference between the CA phases of the currently operating line.

S302: and judging whether the amplitudes of the three-phase voltage effective values of the current operating line are all within the preset amplitude reference range.

In this embodiment, the rated effective value of the three-phase voltage is 60V, and there may be a slight error in measurement, so that the preset amplitude reference range may be set at 60V ± dV, and when the amplitude of the effective value of the three-phase voltage of the currently operating line falls within the range of 60V ± dV, it indicates that the amplitude of the effective value of the three-phase voltage of the currently operating line is correct.

Specifically, d can be 1, the preset amplitude reference range is 59V-61V, and the effective value of the three-phase voltage of the currently running line needs to meet the requirement

The amplitude of the three-phase voltage effective value of the current running line is correct.

S303: and judging whether the phase difference between every two phases of the current operating line is within the preset phase difference reference range.

In this example, the vector diagram of the three-phase voltages is shown in fig. 4, and the A, B, C three-phase voltages have 120 ° phase difference clockwise by two, so the preset phase difference reference range is taken as 120 ° ± e °, and e is taken as 5 °, the preset phase difference reference range is taken as 115 ° to 125 °.

In this embodiment, if the voltage phase difference between every two phases of the currently operating line satisfies the above equation (5) and the three-phase voltage effective value of the currently operating line is within the preset amplitude reference range, it indicates that the connection between the voltage switching screen and the main meter end of the currently operating line is correct.

Similarly, when determining whether the phase difference and the amplitude of the three-phase voltage data of the new device meet the preset reference conditions, the secondary meter 12 needs to determine whether the effective value of the three-phase voltage of the new device is within the preset amplitude reference range, and determine whether the instantaneous value of the three-phase voltage of the new device is within the preset phase difference reference range, and if both the effective value and the instantaneous value are met, it is determined that the phase sequence of the new device is positive and the amplitude is correct. Specifically, the specific process of determining whether the phase difference and the amplitude of the three-phase voltage data of the new device satisfy the preset reference conditions is as described in S301 to S303 above.

As shown in fig. 6, in an embodiment of the present invention, the new device includes a transformer low-voltage side, and a specific implementation flow of S203 in fig. 2 is shown in fig. 6, and a detailed process thereof is as follows:

s601: and calculating the three-phase voltage peak value of the current operating line according to the three-phase voltage effective value of the current operating line.

In this embodiment, when the new device is a high-voltage side of the transformer, a medium-voltage side of the transformer, a line, or a bus, if the voltage loop of the new device is correctly wired, the three-phase voltage phase of the new device is identical to the three-phase voltage phase of the currently operating line, and when the voltage loop of the new device is a low-voltage side of the transformer, the three-phase voltage phase of the low-voltage side of the transformer and the three-phase voltage phase of the currently operating line have a fixed phase difference, so that the new device is divided into a low-voltage side of the transformer and a second device, and different methods are respectively used for phase checking on the low-voltage side of the transformer and the second device.

When the new equipment is the low-voltage side of the transformer, because the phase difference between the three-phase voltage phase of the low-voltage side of the transformer and the three-phase voltage phase of the current operating line is fixed, the phase checking calculation process of the three-phase voltage of the low-voltage side of the transformer and the three-phase voltage of the current operating line is complex, therefore, the three-phase voltage data of the current operating line is the three-phase voltage data of the high-medium voltage side of the transformer based on the principle that the high-medium voltage side of the transformer leads the low-voltage side of the same-phase transformer by n multiplied by 30 degrees, when the three-phase voltage data of the current operating line is obtained, because the phase voltage phase of the current operating line is the same as the phase voltage phase of the high-medium voltage side of the transformer, the three-phase voltage data of the current operating line is the three-phase voltage data of the high-medium voltage side of the transformer, and finishing the nuclear phase work of the low-voltage side of the transformer.

Specifically, first, according to equation (6), the three-phase voltage peak value of the currently operating line is calculated.

In formula (6), U_Am、U_BmAnd U_CmRespectively representing the peak value of the A-phase voltage, the peak value of the B-phase voltage and the peak value of the C-phase voltage of the currently operated equipment.

S602: and calculating the voltage waveform initial phase angle of the current operating line according to the three-phase voltage instantaneous values of the current operating line at each acquisition moment and the three-phase voltage peak value of the current operating line.

In this embodiment, fig. 7 shows a specific implementation flow of S602 in fig. 6, and the process thereof is detailed as follows:

s701: and calculating an initial phase angle initial value of each acquisition time of the current operating line according to the three-phase voltage instantaneous value of each acquisition time of the first phase of the current operating line, the three-phase voltage peak value of the current operating line and a first phase initial phase angle calculation formula, wherein the first phase is any one of the three phases.

In the present embodiment, as shown in fig. 11, fig. 11 shows a voltage waveform of a phase a voltage of a new device and a currently operating line, where a solid line is the voltage waveform of the currently operating line, and a dotted line is the voltage waveform of the new device, U_AmFor the peak value of the A-phase voltage, u, of the currently operating line_AmIs the peak value of the A phase voltage, U, of the new equipment_At1For the instantaneous value of the A-phase voltage, u, at the first acquisition time of the currently operating line_At1The instantaneous value of the a-phase voltage at the first acquisition time of the new device. Can select the current operationCalculating initial phase angle initial values of all the collection moments of the currently running line according to the three-phase voltage peak value of any phase of the line and the three-phase voltage instantaneous values of all the collection moments, wherein a first-phase initial phase angle calculation formula is shown as a formula (7):

if phase A is selected, the 1 st formula in formula (7) is selected to calculate the initial phase angle initial value of each acquisition time of the current operation line, if phase B is selected, the 2 nd formula in formula (7) is selected to calculate the initial phase angle initial value of each acquisition time of the current operation line, and if phase C is selected, the 3 rd formula in formula (7) is selected to calculate the initial phase angle initial value of each acquisition time of the current operation line.

S702: and averaging initial values of the initial phase angles of the current operating line at all the acquisition moments to obtain the initial phase angle of the voltage waveform of the current operating line.

In this embodiment, since there may be a random large error in calculating the initial phase angle of the voltage waveform by using the instantaneous value and the peak value of the voltage at a certain time, in order to improve the accuracy of the initial phase angle of the voltage waveform, the initial values of the initial phase angles at each collecting time of the currently running line are averaged to obtain the initial phase angle of the voltage waveform of the currently running line. Obtaining an initial phase angle of the low-voltage side of the transformer according to the initial phase angle of the voltage waveform of the current running line;

s603: and obtaining the reference value of the initial phase angle of the low-voltage side of the transformer according to the initial phase angle of the voltage waveform of the current running line.

In this embodiment, as can be seen from fig. 10, the voltage waveform initial phase angle of the currently operating line leads the initial phase angle on the low-voltage side of the transformer by n × 30 °, so the voltage waveform initial phase angle on the low-voltage side of the transformer can be obtained by adding or subtracting the current waveform initial phase angle of the currently operating line and n × 30 °.

Specifically, taking phase a as an example, the calculation formula of the initial phase angle of the voltage waveform on the low-voltage side of the transformer is as follows:

in the formula (8), α' represents the voltage waveform initial phase angle of the low voltage side of the transformer, and α represents the voltage waveform initial phase angle of the currently operating device, so that when the voltage waveform initial phase angle of the low voltage side of the transformer is calculated, the voltage waveform initial phase angle of the currently operating device can be used as the initial phase angle reference value of the low voltage side of the transformer, and the voltage waveform initial phase angle of the low voltage side of the transformer is obtained according to the principle that the voltage waveform initial phase angle of the currently operating line is n × 30 ° ahead of the initial phase angle of the low voltage side of the transformer.

S604: and calculating the three-phase voltage peak value of the low-voltage side of the transformer according to the three-phase voltage effective value of the low-voltage side of the transformer.

In this embodiment, the method in S601 is adopted to calculate the peak value of the three-phase voltage on the low-voltage side of the transformer according to the effective value of the three-phase voltage on the low-voltage side of the transformer.

S605: and calculating the three-phase voltage reference value of each acquisition time of the low-voltage side of the transformer according to the three-phase voltage peak value of the low-voltage side of the transformer and the initial phase angle reference value.

In this embodiment, the specific implementation flow of S605 includes: by passing

And calculating three-phase voltage reference values of the low-voltage side of the transformer at each acquisition moment.

U 'in formula (9)'_AtiAn A-phase voltage reference value, u 'representing the ith acquisition time'_BtiA B-phase voltage reference value u 'representing the i-th acquisition time'_CtiC-phase voltage reference value, u, representing the ith acquisition time_AmRepresenting the peak value of the A-phase voltage, u, on the low-voltage side of said transformer_BmRepresenting the peak value of the B-phase voltage, u, on the low-voltage side of said transformer_CmRepresents the peak value of the C phase voltage at the low-voltage side of the transformer,

t represents a preset sampling period, and n represents a connection group number of the transformer.

In the present embodiment, the connection groups on the low voltage side of the transformer are a plurality of connection groups such as Yd11, Yd9, Yd7, Yd5, Yd3, Yd1, and the phase difference between the low voltage side and the high voltage side of the transformer in different connection groups is different, and the three-phase voltage reference value at each sampling time on the low voltage side of the transformer is estimated from the formula (9) and the voltage peak value and the voltage waveform initial phase angle on the low voltage side of the transformer.

S606: and calculating a first voltage difference average value according to the three-phase voltage reference value of each acquisition time at the low-voltage side of the transformer and the corresponding three-phase voltage instantaneous value.

In this embodiment, fig. 8 shows a specific implementation flow of S605 in fig. 6, and the process thereof is detailed as follows:

s801: and calculating a first voltage difference of each acquisition time of the low-voltage side of the transformer according to the three-phase voltage reference value of each acquisition time of the low-voltage side of the transformer and the corresponding three-phase voltage instantaneous value.

In this embodiment, the first voltage difference includes a first a-phase voltage difference, a first B-phase voltage difference, and a first C-phase voltage difference, and according to the formula (10), the first voltage difference at each acquisition time of the low-voltage side of the transformer can be calculated.

Wherein k is_AiRepresenting the first A-phase voltage difference, k, at the ith acquisition instant_BiRepresenting the first B-phase voltage difference, k, at the ith acquisition time_CiThe first C-phase voltage difference at the ith acquisition time is represented.

S802: and averaging the first voltage differences at each acquisition time of the low-voltage side of the transformer to obtain a first voltage difference average value.

In this embodiment, the average value of the voltage difference can be calculated from equation (11).

In formula (11), k_ARepresenting the average value of the first voltage differences, k, between the low-voltage side of the transformer and the phase A of the currently running line_BRepresenting the average value of the first voltage differences, k, between the low-voltage side of the transformer and the phase B of the currently running line_CAnd the average value of the first voltage difference of the low-voltage side of the transformer and the C phase of the current running line is represented.

S607: and if the first voltage difference average value is less than or equal to a first maximum voltage error, determining that the voltage phase of the low-voltage side of the transformer is consistent with the voltage phase of the current running equipment.

In this embodiment, in the phase checking process, it is required to ensure that the relative time difference between the primary meter end 11 and the secondary meter end 12 is not greater than 1ms, that is, the angle error is not greater than 18 °, according to the analysis of the situation where there is a large time difference, taking phase a as an example, the three-phase voltage data on the low-voltage side of the transformer is calculated according to the three-phase voltage data on the high-voltage side, the angle error between the three-phase voltage data on the low-voltage side of the transformer and the actual three-phase voltage data on the low-voltage side of the transformer, which is collected by the secondary meter end 12, is 18 °, the error value vector diagram is shown in fig. 11, and therefore_Ai＝2u_Atisin9 deg. can be calculated to obtain k_AiThe maximum is 26.5V. Therefore, the first maximum voltage error of the present embodiment may be 26.5V, and the calculation method of the first maximum voltage error of the B, C phase is the same as that of the a phase.

And based on the first maximum voltage error of each phase, when the average value of the first voltage differences of the three phases meets the formula (12), judging that the secondary phase checking of the low-voltage side of the transformer is correct.

In an embodiment of the present invention, the new device further includes a second device, the second device includes a line, a high voltage side of a transformer, a medium voltage side of a transformer, and a bus, and the specific process of S203 in fig. 2 includes:

calculating a second voltage difference average value according to the three-phase voltage instantaneous values of the current operating line at each acquisition time and the three-phase voltage instantaneous values of the second equipment;

and if the second voltage difference average value is less than or equal to a second maximum voltage error, judging that the second equipment core phase is correct.

In this embodiment, under the condition that the secondary side voltage loop of the second device is correctly wired, the phase of the three-phase voltage of the second device is consistent with that of the currently operating line, so that the three-phase voltage difference at each acquisition time can be obtained only according to formula (13), the three-phase voltage instantaneous value at each acquisition time of the currently operating line, and the three-phase voltage instantaneous value of the second device, where the formula (13) is:

in formula (13), k'_AiRepresenting the phase A voltage difference, k ', of the second device and the ith acquisition time of the current running line'_BiRepresenting the voltage difference, k ', of the phase B of the second device and the ith acquisition time of the current running line'_CiAnd the voltage difference of the phase C of the second equipment and the ith acquisition moment of the current running line is represented.

And after the three-phase voltage difference at each acquisition moment is calculated, averaging the three-phase voltage difference at each acquisition moment to obtain a second voltage difference average value, wherein the specific calculation process is shown as a formula (14).

K 'in formula (14)'_ARepresenting a second voltage difference average value, k ', of the second device to phase A of the currently running line'_BRepresenting a second voltage difference average value, k ', of the second device to the B phase of the currently running line'_CSecond voltage difference average value representing C phase of second equipment and current operation line。

In this embodiment, under the condition that the secondary side voltage loop of the second device is correctly wired, since the three-phase voltage phases of the second device and the currently operating line are consistent, the three-phase voltage data of the second device is basically the same as the three-phase voltage data of the currently operating line, and the error is very small, therefore, the second maximum voltage error can be set to be 1V, and when the second voltage difference average value of the second device and the currently operating line conforms to the second voltage difference average value of the currently operating line

And judging that the secondary phase checking of the second equipment is correct.

According to the embodiment of the invention, the wireless communication mode is adopted, so that accurate long cables can be omitted, and labor and time for temporarily laying the long cables can be saved. In addition, the secondary phase checking system provided by the embodiment is suitable for the secondary phase checking work of almost all equipment in the station, and provides options of equipment phase checking of a 'transformer low-voltage side' and 'other second equipment'. In addition, after the voltage signals of the new and old equipment are collected, the phase of the secondary side of the new equipment can be automatically checked according to a program, a phase checking result of a current running line is given, errors and time of manual judgment are reduced, and the phase checking work efficiency is improved.

It can be known from the above embodiments that the main meter end 11 and the auxiliary meter end 12 of the system are both equipped with 4 meter pens, and can acquire three-phase voltages at one time, and each voltage coil only needs to acquire for 1 time to determine a phase checking result. The secondary nuclear phase system 1 provided by the embodiment is provided with four meter pens, three-phase voltage can be collected once, a phase-by-phase verification link is omitted, and nuclear phase workload is greatly reduced.

It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

Example two

One embodiment of the present invention provides a secondary nuclear phase method, which is applied to a secondary surface terminal, and the specific process is as follows:

acquiring three-phase voltage data of new equipment; judging whether the phase difference and the amplitude of the three-phase voltage of the new equipment meet preset reference conditions or not; and if the phase difference and the amplitude of the three-phase voltage of the new equipment meet preset reference conditions, sending the three-phase voltage data of the new equipment to a main meter end.

According to the embodiment, the three-phase voltage data of the new equipment is acquired at the secondary meter end, and whether the three-phase voltage data of the new equipment meets the preset reference condition or not is judged, so that whether a connection error phenomenon exists between the secondary side of the voltage transformer body of the new equipment and the voltage switching screen or not can be effectively detected, and the accuracy of secondary phase checking is improved.

EXAMPLE III

As shown in fig. 9, fig. 9 shows a structure of a secondary nuclear phase apparatus 100, applied to a main table terminal 11, which includes:

the voltage data acquisition module 110 is configured to acquire three-phase voltage data of a currently operating line and acquire three-phase voltage data of new equipment, which is sent by the secondary meter end 12 in a wireless manner;

a reference condition determining module 120, configured to determine whether a phase difference and an amplitude of a three-phase voltage of the currently operating line meet the preset reference condition;

and the secondary phase checking module 130 is configured to determine whether the voltage phase of the new device is consistent with the voltage phase of the current operating line according to the three-phase voltage data of the current operating line and the three-phase voltage data of the new device if the phase difference and the amplitude of the three-phase voltage of the current operating line meet preset reference conditions.

As can be seen from the above embodiments, in the embodiments of the present invention, the three-phase voltage data of the current operating line is obtained first, and the three-phase voltage data of the new device, which is sent by the sub-meter 12 in a wireless manner, is obtained; then judging whether the phase difference and the amplitude of the three-phase voltage data of the current operating line meet the preset reference condition or not; and if the phase difference and the amplitude of the three-phase voltage data of the current operating line meet preset reference conditions, determining whether the voltage phase of the new equipment is consistent with the voltage phase of the current operating line according to the three-phase voltage data of the current operating line and the three-phase voltage data of the new equipment. According to the invention, the three-phase voltage data of the new equipment is obtained through the auxiliary meter end 12, and the three-phase voltage data meeting the preset conditions is sent to the main meter end 11 in a wireless communication mode, so that the working link of temporarily placing a long cable is avoided, the three-phase voltage data of the new equipment and the three-phase voltage data of the current operating line are respectively subjected to reference phase difference and amplitude correction at the corresponding meter ends, so that the phenomenon of wiring error is avoided, the phase of the new equipment and the phase of the current operating line are checked after the three-phase voltage data at the two ends meet the preset reference conditions, so that whether the new equipment and the voltage of the current operating line are consistent in phase or not is determined, and the accuracy of secondary phase checking can be ensured.

In an embodiment of the present invention, the three-phase voltage data includes a three-phase voltage instantaneous value and a collection time, and the voltage data obtaining module 110 includes:

In an embodiment of the present invention, the three-phase voltage data further includes a three-phase voltage effective value, and the preset reference condition includes a preset phase difference reference range and a preset amplitude reference range; the reference condition judgment module 120 in fig. 9 includes:

the voltage value calculating unit is used for calculating the phase difference between every two instantaneous three-phase voltage values of the current operating line and the three-phase voltage effective value according to the three-phase voltage instantaneous values of the current operating line at each acquisition moment;

the amplitude judgment unit is used for judging whether the amplitudes of the three-phase voltage effective values of the current operating line are all within the preset amplitude reference range;

and the phase difference judging unit is used for judging whether the phase differences between every two adjacent lines of the current running line are within the preset phase difference reference range.

In one embodiment of the present invention, the voltage value calculation unit includes:

the phase angle calculation subunit is used for calculating a three-phase voltage phase angle corresponding to each acquisition time of the current operating line according to the three-phase voltage instantaneous value at each acquisition time of the current operating line;

the phase difference initial value calculating operator unit is used for calculating a phase difference initial value of a first phase at each acquisition time of the current operating line according to a three-phase voltage phase angle at each acquisition time of the current operating line, wherein the first phase is any one of three phases of the current operating line;

and the phase difference calculating subunit is used for averaging the initial phase difference values of the first phases at each acquisition time of the current operating line to obtain the phase difference of the first phases of the current operating line.

In one embodiment of the present invention, the new equipment includes a transformer low voltage side, and the secondary nuclear phase module 130 includes:

the first voltage peak value calculating unit is used for calculating the three-phase voltage peak value of the current operating line according to the three-phase voltage effective value of the current operating line;

the initial phase angle calculation unit is used for calculating the initial phase angle of the voltage waveform of the current operating line according to the three-phase voltage instantaneous values of the current operating line at each acquisition moment and the three-phase voltage peak value of the current operating line;

the initial phase angle reference value calculating unit is used for obtaining an initial phase angle reference value of the low-voltage side of the transformer according to the initial phase angle of the voltage waveform of the current operating line;

the second voltage peak value calculating unit is used for calculating the three-phase voltage peak value of the low-voltage side of the transformer according to the three-phase voltage effective value of the low-voltage side of the transformer;

the voltage reference value calculating unit is used for calculating the three-phase voltage reference values of the low-voltage side of the transformer at each acquisition moment according to the three-phase voltage peak values and the initial phase angle reference values of the low-voltage side of the transformer;

the first voltage difference average value calculating unit is used for calculating a first voltage difference average value according to the three-phase voltage reference value of each acquisition time at the low-voltage side of the transformer and the corresponding three-phase voltage instantaneous value;

and the first phase checking unit is used for judging that the voltage phase of the low-voltage side of the transformer is consistent with the voltage phase of the current running equipment if the first voltage difference average value is less than or equal to a first maximum voltage error.

In this embodiment, the initial phase angle calculation unit includes:

the initial phase angle initial value calculation operator unit is used for calculating initial phase angle initial values of the current running line at all the acquisition moments according to three-phase voltage instantaneous values of the first phase of the current running line at all the acquisition moments, three-phase voltage peak values of the current running line and a first phase initial phase angle calculation formula, wherein the first phase is any one of the three phases;

and the initial phase angle calculation subunit is used for averaging initial phase angle initial values of all the acquisition moments of the current operating line to obtain the initial phase angle of the voltage waveform of the current operating line.

In the present embodiment, the voltage reference value calculation unit includes:

by passing

Calculating three-phase voltage reference values of the low-voltage side of the transformer at each acquisition moment;

wherein u'_AtiAn A-phase voltage reference value, u 'representing the ith acquisition time'_BtiA B-phase voltage reference value u 'representing the i-th acquisition time'_CtiC-phase voltage reference value, u, representing the ith acquisition time_AmRepresenting the peak value of the a-phase voltage on the low-voltage side of the transformer,u_Bmrepresenting the peak value of the B-phase voltage, u, on the low-voltage side of said transformer_CmRepresents the peak value of the C phase voltage at the low-voltage side of the transformer,

t represents a preset sampling period, alpha represents the initial phase angle of the voltage waveform, and n represents the connection group number of the transformer.

In this embodiment, the first voltage difference average value calculating unit includes:

the first voltage difference calculation subunit is used for calculating first voltage differences of the low-voltage side of the transformer at each acquisition time according to the three-phase voltage reference values of the low-voltage side of the transformer at each acquisition time and the corresponding three-phase voltage instantaneous values;

and the first voltage difference average value operator unit is used for averaging the first voltage differences at each acquisition moment of the low-voltage side of the transformer to obtain a first voltage difference average value.

In this embodiment, the new device further includes a second device, the second device includes a line, a high-voltage side of a transformer, a medium-voltage side of a transformer, and a bus, and the secondary nuclear phase module 130 includes:

the second voltage difference average value calculating unit is used for calculating a second voltage difference average value according to the three-phase voltage instantaneous values of the current running line at each acquisition moment and the three-phase voltage instantaneous values of the second equipment;

and the second phase checking unit is used for judging that the phase checking of the second equipment is correct if the second voltage difference average value is less than or equal to a second maximum voltage error.

Example four

Fig. 10 is a schematic diagram of a terminal device according to an embodiment of the present invention. As shown in fig. 10, the terminal device 10 of this embodiment includes: a processor 101, a memory 102 and a computer program 103 stored in said memory 102 and executable on said processor 101. The processor 101, when executing the computer program 103, implements the steps in the above-described embodiments of the secondary nuclear phase method, such as the steps 201 to 203 shown in fig. 2. Alternatively, the processor 101, when executing the computer program 103, implements the functions of each module/unit in the above-mentioned device embodiments, for example, the functions of the modules 110 to 130 shown in fig. 9.

The computer program 103 may be partitioned into one or more modules/units that are stored in the memory 102 and executed by the processor 101 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program 103 in the terminal device 10.

The terminal device 10 may be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The terminal device 10 may include, but is not limited to, a processor 101, a memory 102. Those skilled in the art will appreciate that fig. 6 is merely an example of the terminal device 10 and does not constitute a limitation of the terminal device 10 and may include more or less components than those shown, or combine certain components, or different components, for example, the terminal device 10 may also include input-output devices, network access devices, buses, etc.

The Processor 101 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The storage 102 may be an internal storage unit of the terminal device 10, such as a hard disk or a memory of the terminal device 10. The memory 102 may also be an external storage device of the terminal device 10, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the terminal device 10. Further, the memory 102 may also include both an internal storage unit and an external storage device of the terminal device 10. The memory 102 is used for storing the computer program and other programs and data required by the terminal device 10. The memory 102 may also be used to temporarily store data that has been output or is to be output.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims

1. A secondary phase checking method is applied to a main table terminal, and comprises the following steps:

if the phase difference and the amplitude of the three-phase voltage data of the current operating line meet preset reference conditions, determining whether the voltage phase of the new equipment is consistent with the voltage phase of the current operating line according to the three-phase voltage data of the current operating line and the three-phase voltage data of the new equipment;

the three-phase voltage data comprise three-phase voltage instantaneous values, acquisition moments and three-phase voltage effective values;

the acquiring of the three-phase voltage data of the current operating line comprises the following steps:

acquiring a preset number of three-phase voltage instantaneous values of the current operating line according to a preset sampling period, and recording the acquisition time of each three-phase voltage instantaneous value of the current operating line;

the preset reference condition comprises a preset phase difference reference range and a preset amplitude reference range; the judging whether the phase difference and the amplitude of the three-phase voltage data of the current operating line meet preset reference conditions or not comprises the following steps:

calculating phase difference and three-phase voltage effective values of the three-phase voltage instantaneous values of the current operating line, which are arranged at intervals in pairs, according to the three-phase voltage instantaneous values of the current operating line at each acquisition time;

judging whether the amplitudes of the three-phase voltage effective values of the current operating line are all within the preset amplitude reference range;

judging whether the phase difference between every two phases of the current operating line is within the preset phase difference reference range;

the calculating of the phase difference between every two phases of the current operating line according to the three-phase voltage instantaneous value of each acquisition time of the current operating line comprises the following steps:

calculating a three-phase voltage phase angle corresponding to each acquisition moment of the current operating line according to the three-phase voltage instantaneous value of each acquisition moment of the current operating line;

calculating a phase difference initial value of a first phase at each acquisition time of the current operating line according to the three-phase voltage phase angle at each acquisition time of the current operating line, wherein the first phase is any one of three phases of the current operating line;

averaging initial values of phase differences between first phases at each acquisition time of the current operating line to obtain a phase difference between the first phases of the current operating line;

the new device comprises a transformer low-voltage side, and the step of determining whether the voltage phase of the new device is consistent with the voltage phase of the current operation line according to the three-phase voltage data of the current operation line and the three-phase voltage data of the new device comprises the following steps:

calculating a three-phase voltage peak value of the current operation line according to the three-phase voltage effective value of the current operation line;

calculating a voltage waveform initial phase angle of the current operation line according to the three-phase voltage instantaneous values of the current operation line at each acquisition moment and the three-phase voltage peak value of the current operation line;

obtaining an initial phase angle reference value of the low-voltage side of the transformer according to the initial phase angle of the voltage waveform of the current running line;

calculating a three-phase voltage peak value of the low-voltage side of the transformer according to the three-phase voltage effective value of the low-voltage side of the transformer;

calculating three-phase voltage reference values of the low-voltage side of the transformer at each acquisition moment according to the three-phase voltage peak value and the initial phase angle reference value of the low-voltage side of the transformer;

calculating a first voltage difference average value according to the three-phase voltage reference value of each acquisition time at the low-voltage side of the transformer and the corresponding three-phase voltage instantaneous value;

and if the first voltage difference average value is less than or equal to a first maximum voltage error, determining that the voltage phase of the low-voltage side of the transformer is consistent with the voltage phase of the current running equipment.

2. The secondary phase-checking method according to claim 1, wherein the calculating the initial phase angle of the voltage waveform of the currently running line according to the instantaneous values of the three-phase voltage at each collection time of the currently running line and the peak value of the three-phase voltage of the currently running line comprises:

calculating initial phase angle initial values of the current operating line at each acquisition time according to three-phase voltage instantaneous values of the current operating line at each acquisition time of a first phase, three-phase voltage peak values of the current operating line and a first phase initial phase angle calculation formula, wherein the first phase is any one of three phases;

and averaging initial values of the initial phase angles of the current operating line at all the acquisition moments to obtain the initial phase angle of the voltage waveform of the current operating line.

3. The secondary phase-checking method of claim 1, wherein the calculating the three-phase voltage reference values at each collection time of the low-voltage side of the transformer according to the three-phase voltage peak values and the initial phase angle reference values at the low-voltage side of the transformer comprises:

by passing

wherein u'_AtiAn A-phase voltage reference value, u 'representing the ith acquisition time'_BtiA B-phase voltage reference value u 'representing the i-th acquisition time'_CtiC-phase voltage reference value, u, representing the ith acquisition time_AmRepresenting the peak value of the A-phase voltage, u, on the low-voltage side of said transformer_BmRepresenting the peak value of the B-phase voltage, u, on the low-voltage side of said transformer_CmRepresents the peak value of the C phase voltage at the low-voltage side of the transformer,

t represents a preset sampling period, alpha represents the initial phase angle of the voltage waveform, and n represents the connection group number of the transformer, wherein the connection group number comprises 11, 9, 7, 5, 3 and 1.

4. The secondary phase-checking method according to claim 1, wherein the calculating a first voltage difference average value according to the three-phase voltage reference values and the corresponding three-phase voltage instantaneous values at the low-voltage side of the transformer comprises:

calculating a first voltage difference of each acquisition time of the low-voltage side of the transformer according to the three-phase voltage reference value of each acquisition time of the low-voltage side of the transformer and the corresponding three-phase voltage instantaneous value;

and averaging the first voltage differences at each acquisition time of the low-voltage side of the transformer to obtain a first voltage difference average value.

5. The secondary phase-checking method of any one of claims 1 to 4, wherein the new device further comprises a second device, the second device comprises a line, a transformer high-voltage side, a transformer medium-voltage side and a bus, and the determining whether the voltage phase of the new device is consistent with the voltage phase of the currently operating line according to the three-phase voltage data of the currently operating line and the three-phase voltage data of the new device comprises:

6. A secondary nuclear phase device, applied to a primary meter end, the device comprising:

the secondary phase checking module is used for determining whether the voltage phase of the new equipment is consistent with the voltage phase of the current operating line or not according to the three-phase voltage data of the current operating line and the three-phase voltage data of the new equipment if the phase difference and the amplitude of the three-phase voltage data of the current operating line meet preset reference conditions;

the preset reference condition comprises a preset phase difference reference range and a preset amplitude reference range; the reference condition judgment module comprises:

the phase difference judging unit is used for judging whether the phase differences between every two lines of the current operating line are within the preset phase difference reference range;

the voltage value calculating unit includes:

the phase difference calculating subunit is configured to average initial phase difference values of the first phases at each acquisition time of the current operating line to obtain a phase difference of the first phases of the current operating line;

the new equipment includes transformer low pressure side, the secondary nuclear phase module includes:

7. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 5 when executing the computer program.

8. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.