CN109142977B - Phase automatic detection method of transient recording type fault indicator - Google Patents
Phase automatic detection method of transient recording type fault indicator Download PDFInfo
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Abstract
The invention discloses a phase automatic detection method of a transient recording type fault indicator, and belongs to the field of automatic detection. The method comprises the steps of receiving a phase detection instruction, wherein the phase detection instruction is sent by a gathering unit of a first fault indicator; searching a second fault indicator on the same power transmission line as the first fault indicator according to the phase detection instruction; sending a time service instruction to the first fault indicator and the second fault indicator; receiving a first set of current values sent by a first fault indicator and a second set of current values sent by a second fault indicator; the current values in the current value group are acquired by an acquisition unit; determining the actual phase of the power transmission line where the acquisition unit in the first fault indicator is located according to the first current value set and the second current value set; the problem that when the phase condition of a certain section of the power transmission line is difficult to determine manually during installation, errors are easily caused in installation of the acquisition unit is solved; the detection method is simple and reliable, and the operation safety of the system is ensured.
Description
Technical Field
The embodiment of the invention relates to the field of automatic detection, in particular to an automatic phase detection method of a transient recording type fault indicator.
Background
With the development of the technology, the transient recording type fault indicator has been widely applied to medium-voltage transmission lines of 35KV and below for monitoring and judging various types of faults in the transmission lines.
Each set of transient recording type fault indicator consists of three acquisition units and a set of collecting unit, wherein the three acquisition units are correspondingly arranged on an A phase, a B phase and a C phase on a power transmission line according to the A phase, the B phase and the C phase, the collecting unit is arranged on a telegraph pole, the collecting unit is in communication connection with the monitoring main station system, the acquired data are sent to the collecting unit through the acquisition units, and then the data are sent to the monitoring main station system through the collecting unit, so that the remote measurement and fault judgment of a line electric field and a current value are realized.
However, in the actual installation process of the transient recording type fault indicator, it is difficult for an installer to determine the phase a, the phase B, and the phase C of a certain section of the power transmission line, the acquisition unit is easily installed with errors, and the installation error is difficult to find in time, which may cause the function failure of the whole set of transient recording type fault indicator, and affect the operation safety of the power transmission system and the power transmission line.
Disclosure of Invention
In order to solve the problems in the prior art, an embodiment of the present invention provides a method for automatically detecting a phase of a transient recording type fault indicator. The technical scheme is as follows:
in a first aspect, a phase automatic detection method of a transient recording type fault indicator is provided, and is applied to a cloud platform corresponding to the transient recording type fault indicator, each transient recording type fault indicator comprises a collecting unit and three acquisition units, the collecting unit is connected with the cloud platform, and the acquisition units are installed on a power transmission line and connected with the collecting unit;
the method comprises the following steps:
receiving a phase detection instruction, wherein the phase detection instruction is sent by an aggregation unit of a first fault indicator; the phase of a power transmission line where a collection unit is located in the first fault indicator is unknown;
searching a second fault indicator on the same power transmission line as the first fault indicator according to the phase detection instruction; the phase of the transmission line where the acquisition unit is located in the second fault indicator is known;
sending a time service instruction to the first fault indicator and the second fault indicator; the time service instruction is used for controlling the first fault indicator and the second fault indicator to carry out current value telemetering wave recording at the same time;
receiving a first set of current values sent by a first fault indicator and a second set of current values sent by a second fault indicator; the current values in the current value group are acquired by an acquisition unit;
and determining the actual phase of the power transmission line where the acquisition unit is located in the first fault indicator according to the first current value set and the second current value set.
Optionally, determining an actual phase of the power transmission line where the acquisition unit is located in the first fault indicator according to the first current value set and the second current value set includes:
determining a local phase corresponding to the current value in the first current value set;
determining an actual phase corresponding to one current value in the first current value set according to the phase corresponding to the current value in the second current value set;
and correcting local phases corresponding to the other two current values in the first current value set according to the actual phase corresponding to one current value in the first current value set to obtain actual phases corresponding to the other two current values.
Optionally, determining a local phase corresponding to the current value in the first current value set includes:
setting a local phase corresponding to the first current value in the first current value group as an A phase;
determining local phases corresponding to the second current value and the third current value according to the current relation between the current values in the first current value set;
a phase angle of the first current value in the first set of current values is calculated.
Optionally, determining an actual phase corresponding to one current value in the first current value set according to a phase corresponding to a current value in the second current value set, includes:
calculating phase angles of three-phase currents in the second current value set;
detecting whether the phase angle of the current with the local phase of the A phase in the first current value set and the phase angle of the current in the second current value set satisfy a preset relation or not aiming at the phase angle of each phase of the current in the second current value set;
if the phase angle of the current with the local phase of the A phase in the first current value set and the phase angle of the A phase current in the second current value set satisfy a preset relation, the actual phase of the current with the local phase of the A phase in the first current value set is the A phase;
if the phase angle of the current with the local phase of the A phase in the first current value set and the phase angle of the current with the B phase in the second current value set satisfy a preset relation, the actual phase of the current with the local phase of the A phase in the first current value set is the B phase;
if the phase angle of the current with the local phase of the A phase in the first current value set and the phase angle of the current with the C phase in the second current value set satisfy a preset relation, the actual phase of the current with the local phase of the A phase in the first current value set is the C phase;
the predetermined relationship is W ═ W × (1 ± β), W' represents the phase angle of the current whose local phase is the a phase in the first current value group, W represents the phase angle of the current in the second current value group, and β represents the remote reference correction error.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the method comprises the steps that a fault indicator with a known phase serves as a far-end reference device, the far-end reference device and a fault indicator with an unknown phase are controlled to conduct current value telemetering and wave recording at the same time, and a cloud platform determines the actual phase of a power transmission line where an acquisition unit in the fault indicator with the unknown phase is located according to the relation between current values sent by the two fault indicators; the problem that when the phase condition of a certain section of the power transmission line is difficult to determine manually during installation, errors are easily caused in installation of the acquisition unit is solved; the phase of the power transmission line is automatically detected on the installation site, the detection method is simple and reliable, and the operation safety of the system is ensured.
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 description of the embodiments will be briefly introduced 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 creative efforts.
Fig. 1 is a schematic structural diagram illustrating an implementation environment of a phase automatic detection method of a transient logging type fault indicator according to an exemplary embodiment;
FIG. 2 is a flow diagram illustrating a method for automatic phase detection of a transient logging-type fault indicator, according to an exemplary embodiment;
fig. 3 is a flow chart illustrating a method for automatic phase detection of a transient logging-type fault indicator, according to another exemplary embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, a schematic structural diagram of an implementation environment according to an embodiment of the invention is shown. The implementation environment includes a cloud platform 110, a first transient fault-logging indicator, and a second transient fault-logging indicator, each of which includes a collection unit and three acquisition units.
The convergence unit in the transient recording type fault indicator establishes a communication connection with the cloud platform 110.
The cloud platform 110 may be a server or a server cluster composed of a plurality of servers or a cloud computing center.
And the acquisition units in the transient recording type fault indicator are respectively connected with the collection unit.
The first transient recording type fault indicator includes an acquisition unit 131, an acquisition unit 132, an acquisition unit 133, and a collecting unit 130, and the phase of the transmission line in which the acquisition unit is located in the first transient recording type fault indicator is unknown.
The second transient recording type fault indicator includes a collecting unit 121, a collecting unit 122, a collecting unit 123 and a first collecting unit 120, wherein the phase of the transmission line where the collecting unit is located is known, for example, the collecting unit 121 is installed on the phase a of the transmission line, the collecting unit 122 is installed on the phase B of the transmission line, and the collecting unit 123 is installed on the phase C of the transmission line.
Referring to fig. 2, a flowchart of a method for automatically detecting a phase of a transient recording fault indicator according to an embodiment of the present invention is shown. The phase automatic detection method of the transient recording type fault indicator is suitable for the cloud platform shown in fig. 1. As shown in fig. 2, the phase automatic detection method may include the steps of:
The phase detection command is sent by the aggregation unit of the first fault indicator.
And an installer of the transient recording type fault indicator controls the collection unit to send a phase detection instruction to the cloud platform by using the control equipment.
The phase of the transmission line in the first fault indicator where the acquisition unit is located is unknown.
The phase of the transmission line in which the acquisition unit is located in the second fault indicator is known.
The second fault indicator operates normally.
And the time service instruction is used for controlling the first fault indicator and the second fault indicator to carry out current value telemetering wave recording at the same time.
The first fault indicator and the second fault indicator are both in the same time T according to the time service instruction0And starting current value telemetering recording for one period at a moment.
The first current value set sent by the first fault indicator comprises three-phase currents, but the actual phase of each phase of current is unknown; the second set of current values sent by the second fault indicator includes three phase currents, the actual phase of each phase of which is known.
And the current values in the current value group are acquired by the acquisition unit.
And step 205, determining the actual phase of the power transmission line where the acquisition unit in the first fault indicator is located according to the first current value set and the second current value set.
The actual phase of the power transmission line where the acquisition unit is located is the actual phase corresponding to the current value acquired by the acquisition unit.
And determining the actual phase corresponding to the current value in the first current value group by taking the phase of the three-phase current in the second current value group as a reference, namely obtaining the actual phase of the power transmission line where the acquisition unit in the first fault indicator is located.
In summary, in the method for automatically detecting a phase of a transient recording type fault indicator provided in the embodiment of the present invention, a fault indicator with a known phase is used as a far-end reference device, and the far-end reference device and a fault indicator with an unknown phase are controlled to perform current value telemetering and recording at the same time, and a cloud platform determines an actual phase of a transmission line where an acquisition unit in the fault indicator with the unknown phase is located according to a relationship between current values sent by the two fault indicators; the problem that when the phase condition of a certain section of the power transmission line is difficult to determine manually during installation, errors are easily caused in installation of the acquisition unit is solved; the phase of the power transmission line is automatically detected on the installation site, the detection method is simple and reliable, and the operation safety of the system is ensured.
Referring to fig. 3, a flowchart of a method for automatically detecting a phase of a transient recording type fault indicator according to another embodiment of the present invention is shown. The phase automatic detection method of the transient recording type fault indicator is suitable for the cloud platform shown in fig. 1. As shown in fig. 3, the phase automatic detection method may include the steps of:
The phase detection command is sent by the aggregation unit of the first fault indicator.
And an installer of the transient recording type fault indicator controls the collection unit to send a phase detection instruction to the cloud platform by using the control equipment.
The phase of the transmission line in the first fault indicator where the acquisition unit is located is unknown.
The phase of the transmission line in which the acquisition unit is located in the second fault indicator is known.
The second fault indicator operates normally.
And the time service instruction is used for controlling the first fault indicator and the second fault indicator to carry out current value telemetering wave recording at the same time.
Step 304 receives a first set of current values sent by the first fault indicator and a second set of current values sent by the second fault indicator.
The first fault indicator and the second fault indicator are both in the same time T according to the time service instruction0And starting current value telemetering recording for one period at a moment.
The first current value set sent by the first fault indicator comprises three-phase currents, but the actual phase of each phase of current is unknown; the second set of current values sent by the second fault indicator includes three phase currents, the actual phase of each phase of which is known.
And the current values in the current value group are acquired by the acquisition unit.
If the time of current telemetry is from T0Time to T0+ Δ T, the first current value set includes the first current value I collected by the first collecting unit1(T) from T0A second current value I collected by the second collecting unit from moment2(T) from T0A third current value I collected by a third collecting unit from moment3(t) applying the first current value I1And (t) setting the corresponding local phase as the phase A.
And step 306, determining local phases corresponding to the second current value and the third current value according to the current relationship among the current values in the first current value set.
The transmission line has A phase, B phase, C phase, A phase current Ia(t) phase B current IbThe relationship between the (t) and C phase currents is as follows:
Ia(t)＝I0+Isin(wt)；
t represents time in seconds; w is 100 pi, I0＞I，
t∈[T0,T0+ΔT]。
The current value A phase current I actually acquired by the acquisition unit takes into account errorsa(t) phase B current Ib(t) phase C current IcThe current relationship between them is:
wherein gamma represents the local judgment error and gamma is less than 0.12.
Therefore, the first current value I1(t) the local phase corresponding to the phase A, and the second current value I can be determined2(t) corresponding local phase and third Current value I3(t) the corresponding local phase, i.e.:
if it satisfies
The second current value I2(t) the corresponding local phase is B phase, and the third current value I3(t) the corresponding local phase is phase C;
if it satisfies
The second current value I2(t) the corresponding local phase is C phase, and the third current value I3And (t) the corresponding local phase is B phase.
Current value InThe phase angle of (d) can be calculated as follows:
In＝I0+Isin(100πt+w0) Formula five
Phase angle w0Comprises the following steps:
first current value I1(t) has a phase angle of
It should be noted that step 306 and step 307 may be executed simultaneously, or step 307 is executed before step 306, which is not limited in this embodiment of the present invention.
And 308, calculating the phase angles of the three-phase currents in the second current value group.
According to the formulas three to five, the phase angle w of the A-phase current in the second current value set can be obtainedAPhase angle w of B-phase currentBPhase angle w of C-phase currentC。
The predetermined relationship is W '═ W × (1 ± β), W' represents a phase angle of a current whose local phase is the a phase in the first current value group, W represents a phase angle of a current in the second current value group, β represents a remote reference correction error, and β < 0.2.
There are several cases as follows:
assuming that the current of the first current value set whose local phase is phase A is the first current value I1(t), first Current value I1(t) has a phase angle of w1(ii) a Phase angle w of phase A current in second current value setAPhase angle w of B-phase currentBPhase angle w of C-phase currentC。
1. And if the phase angle of the current with the local phase of the A phase in the first current value set and the phase angle of the A-phase current in the second current value set satisfy a preset relation, the actual phase of the current with the local phase of the A phase in the first current value set is the A phase.
If it satisfies w1＝wAX (1 + -beta), the first current value I in the first current set1The actual phase of (t) is the A phase.
2. And if the phase angle of the current with the local phase of the A phase in the first current value set and the phase angle of the current with the B phase in the second current value set satisfy a preset relation, the actual phase of the current with the local phase of the A phase in the first current value set is the B phase.
If it satisfies w1＝wBX (1 + -beta), the first current value I in the first current set1The actual phase of (t) is the B phase.
3. And if the phase angle of the current with the local phase of the A phase in the first current value set and the phase angle of the current with the C phase in the second current value set satisfy a preset relation, the actual phase of the current with the local phase of the A phase in the first current value set is the C phase.
If it satisfies w1＝wCX (1 + -beta), the first current value I in the first current set1The actual phase of (t) is the C phase.
If the actual phase of the first current value of which the local phase in the first current value group is the A phase, the actual phase of the second current value of the B phase of the local phase in the first current value group is the B phase, and the actual phase corresponding to the third current value of the C phase of the local phase in the first current value group is the C phase;
if the actual phase of the first current value of which the local phase in the first current value group is the A phase is the B phase, the actual phase of the second current value of the B phase in the local phase in the first current value group is the C phase, and the actual phase corresponding to the third current value of the C phase in the local phase in the first current value group is the A phase;
if the actual phase of the first current value with the local phase in the first current value set as the first current value of the phase a is the phase C, the actual phase of the second current value of the phase B in the local phase in the first current value set is the phase a, and the actual phase corresponding to the third current value of the phase C in the local phase in the first current value set is the phase B.
The cloud platform sends the actual phase to the control equipment held by an installer after determining the actual phase of the power transmission line where the acquisition unit is located in the first fault indicator, the installer judges whether the installation of the acquisition unit is correct according to the actual phase result sent by the cloud platform, and if the installation of the acquisition unit is incorrect, the power transmission line where the acquisition unit is located is adjusted according to the actual phase result.
The ship speed of the electric power in the transmission line is approximate to the light speed, so that the phases of current values of two different remote measuring points at the upstream and downstream of the same transmission line are the same, and therefore, when the phase of an unknown transmission line is determined according to the transient recording type fault indicator of the transmission line where the known acquisition unit is located, whether the acquisition unit in the newly-installed transient recording type fault indicator is installed correctly or not can be determined.
In the measurement calculation, the clock error between the calculated value and the actual value can be eliminated through a GPS time service technology, but the maximum three-phase synthesis error and the telemetering current error of the acquisition unit need to be considered, the judgment influence on the first fault indicator with unknown phase can be obtained as a local judgment error gamma, and the judgment influence on the second fault indicator with known phase is a far-end reference correction error beta.
It is to be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
It should be noted that: the above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (1)
1. The method is characterized in that the method is applied to a cloud platform corresponding to the transient recording type fault indicators, each transient recording type fault indicator comprises a collecting unit and three collecting units, the collecting unit is connected with the cloud platform, and the collecting units are installed on a power transmission line and connected with the collecting unit;
the method comprises the following steps:
receiving a phase detection instruction, wherein the phase detection instruction is sent by a gathering unit of a first fault indicator; the phase of a power transmission line where the acquisition unit is located in the first fault indicator is unknown;
searching a second fault indicator on the same power transmission line as the first fault indicator according to the phase detection instruction; the phase of the transmission line where the acquisition unit is located in the second fault indicator is known;
sending a time service instruction to the first fault indicator and the second fault indicator; the time service instruction is used for controlling the first fault indicator and the second fault indicator to carry out current value telemetering wave recording at the same time;
receiving a first set of current values transmitted by the first fault indicator and a second set of current values transmitted by the second fault indicator; the current values in the current value group are acquired by an acquisition unit;
determining the actual phase of the power transmission line where the acquisition unit is located in the first fault indicator according to the first current value set and the second current value set, including:
determining a local phase corresponding to a current value in the first set of current values, comprising:
setting a local phase corresponding to a first current value in the first current value group as an A phase;
determining local phases corresponding to the second current value and the third current value according to the current relation among the current values in the first current value set;
calculating a phase angle of a first current value in the first set of current values;
determining an actual phase corresponding to one current value in the first current value set according to the phase corresponding to the current value in the second current value set, including:
calculating phase angles of three-phase currents in the second current value set;
detecting whether the phase angle of the current with the local phase of A phase in the first current value set and the phase angle of the current in the second current value set satisfy a preset relation or not aiming at the phase angle of each phase of the current in the second current value set;
if the phase angle of the current with the local phase of the A phase in the first current value set and the phase angle of the current with the A phase in the second current value set satisfy a preset relation, the actual phase of the current with the local phase of the A phase in the first current value set is the A phase;
if the phase angle of the current with the local phase of the A phase in the first current value set and the phase angle of the current with the B phase in the second current value set satisfy a preset relation, the actual phase of the current with the local phase of the A phase in the first current value set is the B phase;
if the phase angle of the current with the local phase of the A phase in the first current value set and the phase angle of the current with the C phase in the second current value set satisfy a preset relation, the actual phase of the current with the local phase of the A phase in the first current value set is the C phase;
wherein the predetermined relationship is W '═ W × (1 ± β), W' represents a phase angle of the current whose local phase is the a phase in the first current value group, W represents a phase angle of the current in the second current value group, and β represents a remote reference correction error;
and correcting local phases corresponding to the other two current values in the first current value set according to the actual phase corresponding to one current value in the first current value set to obtain actual phases corresponding to the other two current values.
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| CN111157847A (en) * | 2020-01-07 | 2020-05-15 | 长沙医学院 | Transient recording fault indicator installation phase sequence self-recognition method |
| CN111913051B (en) * | 2020-05-25 | 2022-01-04 | 威胜信息技术股份有限公司 | Method for automatically adjusting phase sequence of power distribution network, monitoring unit and monitoring system |
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