CN110632427B - Method and device for judging core column structure in distribution transformer - Google Patents
Method and device for judging core column structure in distribution transformer Download PDFInfo
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- CN110632427B CN110632427B CN201910953099.XA CN201910953099A CN110632427B CN 110632427 B CN110632427 B CN 110632427B CN 201910953099 A CN201910953099 A CN 201910953099A CN 110632427 B CN110632427 B CN 110632427B
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Abstract
The application provides a method and a device for judging a core column structure in a distribution transformer. The method comprises the following steps: after a voltage monitoring terminal monitors a low-voltage side voltage value of a power grid system in a current time period, voltage amplitude value change information corresponding to the phase A, the phase B and the phase C is determined, and then a fusing phase of a distribution transformer in the power grid system is determined; after the voltage monitoring terminal monitors the voltage value of the low-voltage side of the power grid system again in the zero-load state, the voltage amplitude values corresponding to the phase A, the phase B and the phase C in the zero-load state are determined, and then the structure of a core column in a distribution transformer in the power grid system can be determined. So, can be simple and convenient, effectual utilization distribution transformer lack of phase condition judges the structure of iron-cored post to electric operating personnel judge fast that the system architecture is three-phase three-column type or three-phase five-column type, and then help troubleshooting fast, reduce the influence to distribution network system transformer.
Description
Technical Field
The application relates to the technical field of power systems, in particular to a method and a device for judging a core post structure in a distribution transformer.
Background
In the current power system, the distribution transformer with three-phase three-column structure and the distribution transformer with three-phase five-column structure are widely applied in the power system. The distribution transformer with three-phase three-column structure is characterized in that three-phase windings are respectively wound on three iron core columns, and the upper part and the lower part of the three iron core columns are connected by iron yokes. The three-phase five-column type distribution transformer is characterized in that the three-phase winding is provided with three iron core columns, two vacant iron core columns without windings are arranged on two sides of the three-phase winding, and the upper part and the lower part of the five iron core columns are connected by iron yokes.
Once a distribution transformer fails, it is first determined whether a core column of the distribution transformer is a three-phase three-column structure or a three-phase five-column structure. The accuracy of the structure of the iron core column in the distribution transformer is judged, and the troubleshooting efficiency of the distribution transformer is directly influenced. However, there is no method for effectively determining the core post structure of the distribution transformer in the prior art.
Based on this, there is a need for a method for determining a core post structure of a distribution transformer, which is used to rapidly determine the core post structure of the distribution transformer.
Disclosure of Invention
The application provides a method and a device for judging a structure of a central iron core column of a distribution transformer, which can be used for quickly judging the structure of the central iron core column of the distribution transformer.
In a first aspect, an embodiment of the present application provides a method for determining a core limb structure in a distribution transformer, where the method is applied to a power grid system, where the power grid system includes the distribution transformer; the method comprises the following steps:
the voltage monitoring terminal monitors the voltage value of the low-voltage side of the power grid system in the current time period;
the voltage monitoring terminal determines voltage amplitude value change information respectively corresponding to the phase A, the phase B and the phase C according to a low-voltage side voltage value of the power grid system in the current time period;
the voltage monitoring terminal determines the fusing phase of a distribution transformer in the power grid system according to the voltage amplitude value change information respectively corresponding to the phase A, the phase B and the phase C;
the voltage monitoring terminal monitors a low-voltage side voltage value of the power grid system in a zero-load state;
the voltage monitoring terminal determines voltage amplitudes respectively corresponding to the phase A, the phase B and the phase C in a zero-load state according to a low-voltage side voltage value of the power grid system in the zero-load state;
and the voltage monitoring terminal determines the structure of a core column in the distribution transformer in the power grid system according to the fusing phase of the distribution transformer in the power grid system and the voltage amplitudes corresponding to the phase A, the phase B and the phase C respectively in a zero-load state.
Optionally, the determining, by the voltage monitoring terminal, the fusing phase of the distribution transformer in the power grid system according to the voltage amplitude variation information corresponding to the phase a, the phase B, and the phase C, respectively includes:
and the voltage detection terminal determines that the fusing phase of the distribution transformer in the power grid system is the A phase according to the voltage amplitude variation information respectively corresponding to the A phase, the B phase and the C phase, if the amplitude of the A phase voltage is reduced along with the increase of the amplitude of the C phase voltage and is increased along with the reduction of the amplitude of the C phase voltage, and the amplitude of the B phase voltage is in a stable trend.
Optionally, the determining, by the voltage monitoring terminal, a structure of a core limb in a distribution transformer in the power grid system according to the fusing phase of the distribution transformer in the power grid system and the voltage amplitudes corresponding to the phase a, the phase B, and the phase C in the zero load state includes:
if the fusing phase of the distribution transformer in the power grid system is the phase A, judging whether the voltage amplitude corresponding to the phase A in the zero load state is the same as the voltage amplitude corresponding to the phase C in the zero load state;
if the voltage amplitude corresponding to the phase A in the zero load state is the same as the voltage amplitude corresponding to the phase C in the zero load state, the structure of a core column in a distribution transformer in the power grid system is a three-phase five-column type;
and if the voltage amplitude corresponding to the phase A in the zero load state is different from the voltage amplitude corresponding to the phase C in the zero load state, the structure of the iron core column in the distribution transformer in the power grid system is a three-phase three-column type.
Optionally, the determining, by the voltage monitoring terminal, the fusing phase of the distribution transformer in the power grid system according to the voltage amplitude variation information corresponding to the phase a, the phase B, and the phase C, respectively includes:
and the voltage detection terminal determines that the fusing phase of the distribution transformer in the power grid system is the B phase according to the voltage amplitude variation information respectively corresponding to the A phase, the B phase and the C phase, if the amplitude of the B phase voltage is reduced along with the increase of the amplitude of the A phase voltage and is increased along with the reduction of the amplitude of the A phase voltage, and the amplitude of the C phase voltage is in a stable trend.
Optionally, the determining, by the voltage monitoring terminal, a structure of a core limb in a distribution transformer in the power grid system according to the fusing phase of the distribution transformer in the power grid system and the voltage amplitudes corresponding to the phase a, the phase B, and the phase C in the zero load state includes:
if the fusing phase of the distribution transformer in the power grid system is the B phase, judging whether the voltage amplitude corresponding to the zero load state of the A phase is the same as the voltage amplitude corresponding to the zero load state of the B phase;
if the voltage amplitude corresponding to the phase A in the zero load state is the same as the voltage amplitude corresponding to the phase B in the zero load state, the structure of a core column in a distribution transformer in the power grid system is a three-phase five-column type;
and if the voltage amplitude corresponding to the phase A in the zero load state is different from the voltage amplitude corresponding to the phase B in the zero load state, the structure of the iron core column in the distribution transformer in the power grid system is a three-phase three-column type.
Optionally, the determining, by the voltage monitoring terminal, the fusing phase of the distribution transformer in the power grid system according to the voltage amplitude variation information corresponding to the phase a, the phase B, and the phase C, respectively includes:
and the voltage detection terminal determines that the fusing phase of the distribution transformer in the power grid system is the C phase according to the voltage amplitude variation information respectively corresponding to the A phase, the B phase and the C phase, if the amplitude of the C phase voltage is reduced along with the increase of the amplitude of the B phase voltage and is increased along with the reduction of the amplitude of the B phase voltage, and the amplitude of the A phase voltage is in a stable trend.
Optionally, the determining, by the voltage monitoring terminal, a structure of a core limb in a distribution transformer in the power grid system according to the fusing phase of the distribution transformer in the power grid system and the voltage amplitudes corresponding to the phase a, the phase B, and the phase C in the zero load state includes:
if the fusing phase of the distribution transformer in the power grid system is the C phase, judging whether the voltage amplitude corresponding to the zero load state of the B phase is the same as the voltage amplitude corresponding to the zero load state of the C phase;
if the voltage amplitude corresponding to the phase B in the zero load state is the same as the voltage amplitude corresponding to the phase C in the zero load state, the structure of a core column in a distribution transformer in the power grid system is a three-phase five-column type;
and if the voltage amplitude corresponding to the phase B in the zero load state is different from the voltage amplitude corresponding to the phase C in the zero load state, the structure of the iron core column in the distribution transformer in the power grid system is a three-phase three-column type.
In a second aspect, an embodiment of the present application provides a device for determining a core column structure in a distribution transformer, where the device is applied to a power grid system, and the power grid system includes the distribution transformer; the device comprises:
the monitoring unit is used for monitoring the voltage value of the low-voltage side of the power grid system in the current time period;
the processing unit is used for determining voltage amplitude value change information respectively corresponding to the phase A, the phase B and the phase C according to a low-voltage side voltage value of the power grid system in the current time period; determining the fusing phase of a distribution transformer in the power grid system according to the voltage amplitude value change information respectively corresponding to the phase A, the phase B and the phase C;
the monitoring unit is also used for monitoring the voltage value of the low-voltage side of the power grid system in a zero-load state;
the processing unit is further used for determining voltage amplitudes corresponding to the phase A, the phase B and the phase C respectively in a zero-load state according to a low-voltage side voltage value of the power grid system in the zero-load state;
and the determining unit is used for determining the structure of a core column in the distribution transformer in the power grid system according to the fusing phase of the distribution transformer in the power grid system and the voltage amplitudes respectively corresponding to the phase A, the phase B and the phase C in a zero-load state.
Optionally, the processing unit is specifically configured to:
according to the voltage amplitude variation information respectively corresponding to the phase A, the phase B and the phase C, if the amplitude of the phase A voltage is reduced along with the increase of the amplitude of the phase C voltage and is increased along with the reduction of the amplitude of the phase C voltage, and the amplitude of the phase B voltage is in a stable trend, determining that the fusing phase of a distribution transformer in the power grid system is the phase A; if the amplitude of the B-phase voltage is reduced along with the increase of the amplitude of the A-phase voltage and is increased along with the reduction of the amplitude of the A-phase voltage, and the amplitude of the C-phase voltage is in a stable trend, determining that the fusing phase of a distribution transformer in the power grid system is the B-phase; and if the amplitude of the C-phase voltage is reduced along with the increase of the amplitude of the B-phase voltage and is increased along with the reduction of the amplitude of the B-phase voltage, and the amplitude of the A-phase voltage is in a stable trend, determining that the fusing phase of the distribution transformer in the power grid system is the C phase.
Optionally, the determining unit is specifically configured to:
if the fusing phase of the distribution transformer in the power grid system is the phase A, judging whether the voltage amplitude corresponding to the phase A in the zero load state is the same as the voltage amplitude corresponding to the phase C in the zero load state; if the voltage amplitude corresponding to the phase A in the zero load state is the same as the voltage amplitude corresponding to the phase C in the zero load state, the structure of a core column in a distribution transformer in the power grid system is a three-phase five-column type; if the voltage amplitude corresponding to the phase A in the zero load state is different from the voltage amplitude corresponding to the phase C in the zero load state, the structure of a core column in a distribution transformer in the power grid system is a three-phase three-column type;
if the fusing phase of the distribution transformer in the power grid system is the B phase, judging whether the voltage amplitude corresponding to the zero load state of the A phase is the same as the voltage amplitude corresponding to the zero load state of the B phase; if the voltage amplitude corresponding to the phase A in the zero load state is the same as the voltage amplitude corresponding to the phase B in the zero load state, the structure of a core column in a distribution transformer in the power grid system is a three-phase five-column type; if the voltage amplitude corresponding to the phase A in the zero load state is different from the voltage amplitude corresponding to the phase B in the zero load state, the structure of a core column in a distribution transformer in the power grid system is a three-phase three-column type;
if the fusing phase of the distribution transformer in the power grid system is the C phase, judging whether the voltage amplitude corresponding to the zero load state of the B phase is the same as the voltage amplitude corresponding to the zero load state of the C phase; if the voltage amplitude corresponding to the phase B in the zero load state is the same as the voltage amplitude corresponding to the phase C in the zero load state, the structure of a core column in a distribution transformer in the power grid system is a three-phase five-column type; and if the voltage amplitude corresponding to the phase B in the zero load state is different from the voltage amplitude corresponding to the phase C in the zero load state, the structure of the iron core column in the distribution transformer in the power grid system is a three-phase three-column type.
In a third aspect, an apparatus is further provided in an embodiment of the present application, where the apparatus has a function of implementing the above-described method for determining a core limb structure in a distribution transformer. This function may be implemented by hardware executing corresponding software, and in one possible design, the apparatus includes: a processor, a transceiver, a memory; the memory is used for storing computer execution instructions, the transceiver is used for realizing the communication between the device and other communication entities, the processor and the memory are connected through the bus, and when the device runs, the processor executes the computer execution instructions stored in the memory so as to enable the device to execute the above-described method for judging the core column structure in the distribution transformer.
An embodiment of the present invention further provides a computer storage medium, where a software program is stored in the storage medium, and when the software program is read and executed by one or more processors, the software program implements the method for determining the core limb structure in the distribution transformer described in the foregoing various possible implementation manners.
Embodiments of the present invention further provide a computer program product containing instructions, which when run on a computer, causes the computer to execute the method for determining a core limb structure in a distribution transformer described in the foregoing various possible implementation manners.
By adopting the method, after the voltage monitoring terminal monitors the voltage value of the low-voltage side of the power grid system in the current time period, the voltage amplitude value change information respectively corresponding to the phase A, the phase B and the phase C is determined, and then the fusing phase of a distribution transformer in the power grid system is determined; and after monitoring the voltage value of the low-voltage side of the power grid system in the zero-load state again, the voltage monitoring terminal determines the voltage amplitudes corresponding to the phase A, the phase B and the phase C in the zero-load state respectively, and then determines the structure of a core column in the power grid system according to the fusing phase of the distribution transformer in the power grid system and the voltage amplitudes corresponding to the phase A, the phase B and the phase C in the zero-load state respectively. So, can be simple and convenient, effectual utilization distribution transformer lack of phase condition judges the structure of iron-cored post to electric operating personnel judge fast that the system architecture is three-phase three-column type or three-phase five-column type, and then help troubleshooting fast, reduce the influence to distribution network system transformer.
Drawings
Fig. 1 is a schematic flow chart corresponding to a method for determining a core limb structure in a distribution transformer according to an embodiment of the present disclosure;
fig. 2 is one of schematic diagrams of voltage value change information respectively corresponding to the phase a, the phase B, and the phase C in the current time period, provided in the embodiment of the present application;
fig. 3 is a second schematic diagram of voltage value change information respectively corresponding to the phase a, the phase B, and the phase C in the current time period provided in the embodiment of the present application;
fig. 4 is a third schematic diagram of voltage value change information respectively corresponding to the phase a, the phase B, and the phase C in the current time period, provided in the embodiment of the present application;
FIG. 5 is a schematic diagram of three-phase voltage waveforms when phase A is fused;
FIG. 6 is a second schematic diagram of three-phase voltage waveforms when phase A is fused;
fig. 7 is a schematic flowchart illustrating integrity corresponding to a method for determining a core limb structure in a distribution transformer according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a device for determining a core limb structure in a distribution transformer according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The distribution transformer in the embodiment of the application is a Dyn11 type transformer, the high-voltage side of the Dyn11 type transformer adopts a triangular connection mode, and the low-voltage side adopts a star connection mode. The Dyn11 type transformer is the most widely used transformer type at present, and has many advantages, such as stronger unbalanced load capacity, high output voltage quality, capability of providing a path for zero-sequence current, capability of preventing the zero-sequence current from entering a high-voltage power grid, and the like. Therefore, in most project revamping of power systems, transformers of other coupling classes are also gradually replaced by Dyn11 type transformers. Therefore, the judgment method for researching the Dyn11 type transformer core column structure is significant.
Fig. 1 exemplarily shows a flow chart corresponding to a method for determining a core limb structure in a distribution transformer provided in an embodiment of the present application. As shown in fig. 1, the method specifically comprises the following steps:
step 101, a voltage monitoring terminal monitors a low-voltage side voltage value of the power grid system in a current time period.
And step 102, the voltage monitoring terminal determines voltage amplitude value change information respectively corresponding to the phase A, the phase B and the phase C according to the voltage value of the low-voltage side of the power grid system in the current time period.
And 103, determining the fusing phase of the distribution transformer in the power grid system by the voltage monitoring terminal according to the voltage amplitude value change information respectively corresponding to the phase A, the phase B and the phase C.
And 104, monitoring the voltage value of the low-voltage side of the power grid system in a zero-load state by the voltage monitoring terminal.
And 105, determining the voltage amplitudes respectively corresponding to the phase A, the phase B and the phase C in the zero load state by the voltage monitoring terminal according to the low-voltage side voltage value of the power grid system in the zero load state.
And 106, determining the structure of a core column in the distribution transformer in the power grid system by the voltage monitoring terminal according to the fusing phase of the distribution transformer in the power grid system and the voltage amplitudes respectively corresponding to the phase A, the phase B and the phase C in a zero-load state.
By adopting the method for judging the core limb structure in the distribution transformer, the structure of the core limb can be judged simply and effectively by utilizing the phase-lack condition of the distribution transformer, so that an electrical operator can quickly judge whether the system structure is a three-phase three-limb type or a three-phase five-limb type, and further the method is helpful for quickly troubleshooting and reducing the influence on the transformer of the distribution network system.
In steps 101 and 102, the voltage monitoring terminal may monitor a low-voltage side voltage value of the power grid system in a current time period, and further, the voltage monitoring terminal may determine voltage amplitude change information corresponding to the phase a, the phase B, and the phase C in a plurality of time periods according to the low-voltage side voltage values in the plurality of time periods.
The three-phase alternating current is a transmission form of electric energy, and is referred to as three-phase power for short. The three-phase AC power supply consists of three AC potentials with the same frequency, equal amplitude and phase difference of 120 deg. Generally, the three phases are divided into a phase a, a phase B, and a phase C.
It should be noted that the low-voltage side voltage value of the power grid system monitored by the voltage monitoring terminal in the current time period may be a low-voltage side voltage value measured by the power grid system when the load is connected.
Further, the time range of the current time period may be within 5min to 10min, and is not particularly limited.
In step 103, according to the difference of the voltage amplitude value change information respectively corresponding to the phase a, the phase B, and the phase C, the fusing phases of the distribution transformer in the power grid system determined by the voltage monitoring terminal are also different, and the following three conditions can be specifically distinguished:
the first condition is as follows: the fusing phase is A phase
And the voltage detection terminal determines that the fusing phase of the distribution transformer in the power grid system is the A phase according to the voltage amplitude variation information respectively corresponding to the A phase, the B phase and the C phase, if the amplitude of the A phase voltage is reduced along with the increase of the amplitude of the C phase voltage and is increased along with the reduction of the amplitude of the C phase voltage, and the amplitude of the B phase voltage is in a stable trend.
Specifically, as shown in fig. 2, there is provided one of schematic diagrams of voltage value change information respectively corresponding to the phase a, the phase B, and the phase C in the current time period, according to the embodiment of the present application.
As can be seen from fig. 2, the amplitude of the a-phase voltage decreases with the increase of the amplitude of the C-phase voltage, and increases with the decrease of the amplitude of the C-phase voltage, while the amplitude of the B-phase voltage substantially maintains a fixed value trend, so that the fused phase of the distribution transformer in the grid system can be determined to be the a-phase.
Case two: the fusing phase is B phase
According to voltage amplitude change information respectively corresponding to the A phase, the B phase and the C phase, if the amplitude of the B phase voltage is reduced along with the increase of the amplitude of the A phase voltage and is increased along with the reduction of the amplitude of the A phase voltage, and the amplitude of the C phase voltage is in a stable trend, the fusing phase of a distribution transformer in a power grid system can be determined to be the B phase.
Specifically, as shown in fig. 3, a second schematic diagram of voltage value change information respectively corresponding to the phase a, the phase B, and the phase C in the current time period is provided for the embodiment of the present application.
As can be seen from fig. 3, the B-phase voltage amplitude decreases with the increase of the a-phase voltage amplitude, increases with the decrease of the a-phase voltage amplitude, and the C-phase voltage amplitude substantially maintains a fixed value trend, so that the fused phase of the distribution transformer in the grid system can be determined as the B-phase.
Case three: the fusing phase is C phase
According to voltage amplitude change information respectively corresponding to the A phase, the B phase and the C phase, if the amplitude of the C phase voltage is reduced along with the increase of the amplitude of the B phase voltage and is increased along with the reduction of the amplitude of the B phase voltage, and the amplitude of the A phase voltage is in a stable trend, the fusing phase of a distribution transformer in a power grid system can be determined to be the C phase.
Specifically, as shown in fig. 4, a third schematic diagram of voltage value change information respectively corresponding to the phase a, the phase B, and the phase C in the current time period is provided for the embodiment of the present application.
As can be seen from fig. 4, the amplitude of the C-phase voltage decreases with the increase of the amplitude of the B-phase voltage, and increases with the decrease of the amplitude of the B-phase voltage, while the amplitude of the a-phase voltage substantially maintains a fixed value trend, so that the fused phase of the distribution transformer in the grid system can be determined to be the C-phase.
In steps 104 and 105, after determining the fused phase, the voltage monitoring terminal may disconnect the load of each phase, that is, monitor the low-voltage side voltage value of the power grid system in a zero-load state.
Further, the voltage monitoring terminal may determine voltage amplitudes corresponding to the phase a, the phase B, and the phase C in the zero load state according to a low-voltage side voltage value of the power grid system in the zero load state.
It should be noted that the voltage monitoring terminal may monitor a voltage value of the low-voltage side of the power grid system at a certain time in a zero-load state, or the voltage monitoring terminal may monitor a voltage value of the low-voltage side of the power grid system at a certain time period in the zero-load state, which is not limited specifically.
In step 106, according to the difference of the fusing phases of the distribution transformer in the power grid system, the voltage monitoring terminal determines that the structure of the iron core column in the distribution transformer in the power grid system is also different, and the following three conditions can be specifically and similarly divided:
the first condition is as follows: the fusing phase is A phase
If the fusing phase of the distribution transformer in the power grid system is the phase A, whether the voltage amplitude corresponding to the phase A in the zero load state is the same as the voltage amplitude corresponding to the phase C in the zero load state can be judged.
Further, if the voltage amplitude corresponding to the phase A in the zero load state is the same as the voltage amplitude corresponding to the phase C in the zero load state, the structure of a core column in a distribution transformer in the power grid system is a three-phase five-column type; and if the voltage amplitude corresponding to the phase A in the zero load state is different from the voltage amplitude corresponding to the phase C in the zero load state, the structure of the iron core column in the distribution transformer in the power grid system is a three-phase three-column type.
For example, as shown in fig. 5, it is one of the schematic diagrams of three-phase voltage waveforms when the a phase is fused. As can be seen from fig. 5, the voltage amplitude corresponding to the phase a in the zero load state is the same as the voltage amplitude corresponding to the phase C in the zero load state, and the structure of the iron core column in the distribution transformer in the power grid system is a three-phase five-column type.
FIG. 6 shows a second schematic diagram of three-phase voltage waveforms when the A-phase is fused. As can be seen from fig. 6, the voltage amplitude corresponding to the phase a in the zero load state is different from the voltage amplitude corresponding to the phase C in the zero load state, and the structure of the iron core column in the distribution transformer in the power grid system is a three-phase three-column type.
Case two: the fusing phase is B phase
If the fusing phase of the distribution transformer in the power grid system is the B phase, whether the voltage amplitude corresponding to the zero load state of the A phase is the same as the voltage amplitude corresponding to the zero load state of the B phase can be judged.
Further, if the voltage amplitude corresponding to the phase A in the zero load state is the same as the voltage amplitude corresponding to the phase B in the zero load state, the structure of a core column in a distribution transformer in the power grid system is a three-phase five-column type; and if the voltage amplitude corresponding to the phase A in the zero load state is different from the voltage amplitude corresponding to the phase B in the zero load state, the structure of the iron core column in the distribution transformer in the power grid system is a three-phase three-column type.
Case three: the fusing phase is C phase
If the fusing phase of the distribution transformer in the power grid system is the C phase, whether the voltage amplitude corresponding to the zero load state of the B phase is the same as the voltage amplitude corresponding to the zero load state of the C phase can be judged.
Further, if the voltage amplitude corresponding to the phase B in the zero load state is the same as the voltage amplitude corresponding to the phase C in the zero load state, the structure of a core column in a distribution transformer in the power grid system is a three-phase five-column type; and if the voltage amplitude corresponding to the phase B in the zero load state is different from the voltage amplitude corresponding to the phase C in the zero load state, the structure of the iron core column in the distribution transformer in the power grid system is a three-phase three-column type.
In the three cases, if the voltage monitoring terminal can monitor the voltage value of the low-voltage side of the power grid system at a certain moment in the zero-load state, the structure of the iron core column in the distribution transformer in the power grid system can be directly determined according to the voltage amplitude value corresponding to the phase a in the zero-load state, the voltage amplitude value corresponding to the phase B in the zero-load state, and the voltage amplitude value corresponding to the phase C in the zero-load state at the moment; if the voltage monitoring terminal can monitor the voltage value of the low-voltage side of the power grid system in a certain time period under the zero load state, the structure of the iron core column in the power distribution transformer in the power grid system can be judged according to the voltage amplitude value corresponding to the zero load state of the phase A, the voltage amplitude value corresponding to the zero load state of the phase B and the voltage amplitude value corresponding to the zero load state of the phase C under the time period, for example, the structure is judged according to the voltage amplitude values of the phase A, the phase B and the phase C corresponding to each moment under the time period, and therefore accuracy is improved.
In order to describe the method for determining the core post structure of the distribution transformer provided in the embodiment of the present application more clearly, the following method for determining the core post structure of the distribution transformer is described in entirety with reference to fig. 7, and specifically includes the following steps:
step 701, a voltage monitoring terminal monitors a voltage value of a low-voltage side of the power grid system in a current time period.
Step 702, the voltage monitoring terminal determines voltage amplitude variation information corresponding to the phase a, the phase B and the phase C respectively according to the low-voltage side voltage value of the power grid system in the current time period.
And 703, determining that the fusing phase of the distribution transformer in the power grid system is the phase A if the amplitude of the phase A voltage is reduced along with the increase of the amplitude of the phase C voltage and is increased along with the reduction of the amplitude of the phase C voltage and the amplitude of the phase B voltage is in a stable trend by the voltage detection terminal according to the change information of the voltage amplitudes corresponding to the phase A, the phase B and the phase C respectively.
Step 704, the voltage detection terminal determines whether the voltage amplitude corresponding to the zero load state of the phase a is the same as the voltage amplitude corresponding to the zero load state of the phase C, if so, step 705 is executed; otherwise, step 706 is performed.
And step 706, the structure of the iron core column in the distribution transformer in the power grid system is a three-phase three-column type.
And 707, determining that the fusing phase of the distribution transformer in the power grid system is the phase B if the amplitude of the phase B voltage decreases with the increase of the amplitude of the phase A voltage and increases with the decrease of the amplitude of the phase A voltage and the amplitude of the phase C voltage is in a stable trend by the voltage detection terminal according to the change information of the voltage amplitudes corresponding to the phase A, the phase B and the phase C respectively.
Step 708, the voltage detection terminal determines whether the voltage amplitude corresponding to the zero load state of the phase a is the same as the voltage amplitude corresponding to the zero load state of the phase B, and if so, step 709 is executed; otherwise, step 710 is performed.
And 709, adopting a three-phase five-column type structure as a core column in the distribution transformer in the power grid system.
And step 710, the structure of a core column in a distribution transformer in the power grid system is a three-phase three-column type.
And 711, determining that the fused phase of the distribution transformer in the power grid system is the C phase by the voltage detection terminal according to the voltage amplitude variation information corresponding to the A phase, the B phase and the C phase respectively, if the amplitude of the C phase voltage is reduced along with the increase of the amplitude of the B phase voltage and is increased along with the reduction of the amplitude of the B phase voltage and the amplitude of the A phase voltage is in a stable trend.
Step 712, the voltage detection terminal determines whether the voltage amplitude corresponding to the zero load state of the phase B is the same as the voltage amplitude corresponding to the zero load state of the phase C, if so, step 713 is executed; otherwise, step 714 is performed.
And 713, enabling the structure of a core column in a distribution transformer in the power grid system to be a three-phase five-column type.
And 714, the structure of the iron core column in the distribution transformer in the power grid system is a three-phase three-column type.
The following are embodiments of the apparatus of the present application that may be used to perform embodiments of the method of the present application. For details which are not disclosed in the embodiments of the apparatus of the present application, reference is made to the embodiments of the method of the present application.
Fig. 8 is a schematic structural diagram schematically illustrating a device for determining a core limb structure in a distribution transformer according to an embodiment of the present application. As shown in fig. 8, the apparatus has a function of implementing the above method for determining the core column structure in the distribution transformer, and the function may be implemented by hardware, or may be implemented by hardware executing corresponding software. The device is applied to a power grid system, wherein the power grid system comprises a distribution transformer; the apparatus may include: a monitoring unit 801, a processing unit 802 and a determination unit 803.
The monitoring unit 801 is configured to monitor a low-voltage side voltage value of the power grid system in a current time period;
the processing unit 802 is configured to determine voltage amplitude change information corresponding to each of the phase a, the phase B, and the phase C according to a low-voltage side voltage value of the power grid system in a current time period; determining the fusing phase of a distribution transformer in the power grid system according to the voltage amplitude value change information respectively corresponding to the phase A, the phase B and the phase C;
the monitoring unit 801 is further configured to monitor a low-voltage side voltage value of the power grid system in a zero-load state;
the processing unit 802 is further configured to determine, according to a low-voltage side voltage value of the power grid system in a zero-load state, voltage amplitudes corresponding to the phase a, the phase B, and the phase C in the zero-load state;
the determining unit 803 is configured to determine a structure of a core limb in a distribution transformer in the power grid system according to the fusing phase of the distribution transformer in the power grid system and the voltage amplitudes corresponding to the phase a, the phase B, and the phase C in the zero load state.
Optionally, the processing unit 802 is specifically configured to:
according to the voltage amplitude variation information respectively corresponding to the phase A, the phase B and the phase C, if the amplitude of the phase A voltage is reduced along with the increase of the amplitude of the phase C voltage and is increased along with the reduction of the amplitude of the phase C voltage, and the amplitude of the phase B voltage is in a stable trend, determining that the fusing phase of a distribution transformer in the power grid system is the phase A; if the amplitude of the B-phase voltage is reduced along with the increase of the amplitude of the A-phase voltage and is increased along with the reduction of the amplitude of the A-phase voltage, and the amplitude of the C-phase voltage is in a stable trend, determining that the fusing phase of a distribution transformer in the power grid system is the B-phase; and if the amplitude of the C-phase voltage is reduced along with the increase of the amplitude of the B-phase voltage and is increased along with the reduction of the amplitude of the B-phase voltage, and the amplitude of the A-phase voltage is in a stable trend, determining that the fusing phase of the distribution transformer in the power grid system is the C phase.
Optionally, the determining unit 803 is specifically configured to:
if the fusing phase of the distribution transformer in the power grid system is the phase A, judging whether the voltage amplitude corresponding to the phase A in the zero load state is the same as the voltage amplitude corresponding to the phase C in the zero load state; if the voltage amplitude corresponding to the phase A in the zero load state is the same as the voltage amplitude corresponding to the phase C in the zero load state, the structure of a core column in a distribution transformer in the power grid system is a three-phase five-column type; if the voltage amplitude corresponding to the phase A in the zero load state is different from the voltage amplitude corresponding to the phase C in the zero load state, the structure of a core column in a distribution transformer in the power grid system is a three-phase three-column type;
if the fusing phase of the distribution transformer in the power grid system is the B phase, judging whether the voltage amplitude corresponding to the zero load state of the A phase is the same as the voltage amplitude corresponding to the zero load state of the B phase; if the voltage amplitude corresponding to the phase A in the zero load state is the same as the voltage amplitude corresponding to the phase B in the zero load state, the structure of a core column in a distribution transformer in the power grid system is a three-phase five-column type; if the voltage amplitude corresponding to the phase A in the zero load state is different from the voltage amplitude corresponding to the phase B in the zero load state, the structure of a core column in a distribution transformer in the power grid system is a three-phase three-column type;
if the fusing phase of the distribution transformer in the power grid system is the C phase, judging whether the voltage amplitude corresponding to the zero load state of the B phase is the same as the voltage amplitude corresponding to the zero load state of the C phase; if the voltage amplitude corresponding to the phase B in the zero load state is the same as the voltage amplitude corresponding to the phase C in the zero load state, the structure of a core column in a distribution transformer in the power grid system is a three-phase five-column type; and if the voltage amplitude corresponding to the phase B in the zero load state is different from the voltage amplitude corresponding to the phase C in the zero load state, the structure of the iron core column in the distribution transformer in the power grid system is a three-phase three-column type.
In an exemplary embodiment, a computer-readable storage medium is further provided, in which a computer program or an intelligent contract is stored, and the computer program or the intelligent contract is loaded and executed by a node to implement the transaction processing method provided by the above-described embodiment. Alternatively, the computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
Those skilled in the art will clearly understand that the techniques in the embodiments of the present application may be implemented by way of software plus a required general hardware platform. Based on such understanding, the technical solutions in the embodiments of the present application may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the embodiments or some parts of the embodiments of the present application.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (8)
1. The method for judging the core column structure in the distribution transformer is characterized in that the method is applied to a power grid system, and the power grid system comprises the distribution transformer; the method comprises the following steps:
the voltage monitoring terminal monitors the voltage value of the low-voltage side of the power grid system in the current time period;
the voltage monitoring terminal determines voltage amplitude value change information respectively corresponding to the phase A, the phase B and the phase C according to a low-voltage side voltage value of the power grid system in the current time period;
the voltage monitoring terminal determines the fusing phase of a distribution transformer in the power grid system according to the voltage amplitude value change information respectively corresponding to the phase A, the phase B and the phase C;
the voltage monitoring terminal monitors a low-voltage side voltage value of the power grid system in a zero-load state;
the voltage monitoring terminal determines voltage amplitudes respectively corresponding to the phase A, the phase B and the phase C in a zero-load state according to a low-voltage side voltage value of the power grid system in the zero-load state;
if the fusing phase of the distribution transformer in the power grid system is the B phase, judging whether the voltage amplitude corresponding to the zero load state of the A phase is the same as the voltage amplitude corresponding to the zero load state of the B phase;
if the voltage amplitude corresponding to the phase A in the zero load state is the same as the voltage amplitude corresponding to the phase B in the zero load state, the structure of a core column in a distribution transformer in the power grid system is a three-phase five-column type;
and if the voltage amplitude corresponding to the phase A in the zero load state is different from the voltage amplitude corresponding to the phase B in the zero load state, the structure of the iron core column in the distribution transformer in the power grid system is a three-phase three-column type.
2. The method of claim 1, wherein the determining, by the voltage monitoring terminal, the fused phase of the distribution transformer in the power grid system according to the voltage amplitude variation information corresponding to the phase a, the phase B, and the phase C respectively comprises:
and the voltage monitoring terminal determines that the fusing phase of the distribution transformer in the power grid system is the A phase according to the voltage amplitude variation information respectively corresponding to the A phase, the B phase and the C phase, if the amplitude of the A phase voltage is reduced along with the increase of the amplitude of the C phase voltage and is increased along with the reduction of the amplitude of the C phase voltage, and the amplitude of the B phase voltage is in a stable trend.
3. The method of claim 1, wherein the determining, by the voltage monitoring terminal, the fused phase of the distribution transformer in the power grid system according to the voltage amplitude variation information corresponding to the phase a, the phase B, and the phase C respectively comprises:
and the voltage monitoring terminal determines that the fusing phase of the distribution transformer in the power grid system is the B phase according to the voltage amplitude variation information respectively corresponding to the A phase, the B phase and the C phase, if the amplitude of the B phase voltage is reduced along with the increase of the amplitude of the A phase voltage and is increased along with the reduction of the amplitude of the A phase voltage, and the amplitude of the C phase voltage is in a stable trend.
4. The method of claim 1, wherein the determining, by the voltage monitoring terminal, the fused phase of the distribution transformer in the power grid system according to the voltage amplitude variation information corresponding to the phase a, the phase B, and the phase C respectively comprises:
and the voltage monitoring terminal determines that the fusing phase of the distribution transformer in the power grid system is the C phase according to the voltage amplitude variation information respectively corresponding to the A phase, the B phase and the C phase, if the C phase voltage amplitude is reduced along with the increase of the B phase voltage amplitude and is increased along with the reduction of the B phase voltage amplitude and the A phase voltage amplitude is in a stable trend.
5. The method of claim 1, further comprising:
if the fusing phase of the distribution transformer in the power grid system is the C phase, judging whether the voltage amplitude corresponding to the zero load state of the B phase is the same as the voltage amplitude corresponding to the zero load state of the C phase;
if the voltage amplitude corresponding to the phase B in the zero load state is the same as the voltage amplitude corresponding to the phase C in the zero load state, the structure of a core column in a distribution transformer in the power grid system is a three-phase five-column type;
and if the voltage amplitude corresponding to the phase B in the zero load state is different from the voltage amplitude corresponding to the phase C in the zero load state, the structure of the iron core column in the distribution transformer in the power grid system is a three-phase three-column type.
6. The device for judging the core column structure in the distribution transformer is characterized in that the device is applied to a power grid system, and the power grid system comprises the distribution transformer; the device comprises:
the monitoring unit is used for monitoring the voltage value of the low-voltage side of the power grid system in the current time period;
the processing unit is used for determining voltage amplitude value change information respectively corresponding to the phase A, the phase B and the phase C according to a low-voltage side voltage value of the power grid system in the current time period; determining the fusing phase of a distribution transformer in the power grid system according to the voltage amplitude value change information respectively corresponding to the phase A, the phase B and the phase C;
the monitoring unit is also used for monitoring the voltage value of the low-voltage side of the power grid system in a zero-load state;
the processing unit is further used for determining voltage amplitudes corresponding to the phase A, the phase B and the phase C respectively in a zero-load state according to a low-voltage side voltage value of the power grid system in the zero-load state;
a determination unit, specifically configured to:
if the fusing phase of the distribution transformer in the power grid system is the B phase, judging whether the voltage amplitude corresponding to the zero load state of the A phase is the same as the voltage amplitude corresponding to the zero load state of the B phase; if the voltage amplitude corresponding to the phase A in the zero load state is the same as the voltage amplitude corresponding to the phase B in the zero load state, the structure of a core column in a distribution transformer in the power grid system is a three-phase five-column type; and if the voltage amplitude corresponding to the phase A in the zero load state is different from the voltage amplitude corresponding to the phase B in the zero load state, the structure of the iron core column in the distribution transformer in the power grid system is a three-phase three-column type.
7. The apparatus according to claim 6, wherein the processing unit is specifically configured to:
according to the voltage amplitude variation information respectively corresponding to the phase A, the phase B and the phase C, if the amplitude of the phase A voltage is reduced along with the increase of the amplitude of the phase C voltage and is increased along with the reduction of the amplitude of the phase C voltage, and the amplitude of the phase B voltage is in a stable trend, determining that the fusing phase of a distribution transformer in the power grid system is the phase A; if the amplitude of the B-phase voltage is reduced along with the increase of the amplitude of the A-phase voltage and is increased along with the reduction of the amplitude of the A-phase voltage, and the amplitude of the C-phase voltage is in a stable trend, determining that the fusing phase of a distribution transformer in the power grid system is the B-phase; and if the amplitude of the C-phase voltage is reduced along with the increase of the amplitude of the B-phase voltage and is increased along with the reduction of the amplitude of the B-phase voltage, and the amplitude of the A-phase voltage is in a stable trend, determining that the fusing phase of the distribution transformer in the power grid system is the C phase.
8. The apparatus of claim 6, wherein the determining unit is further configured to:
if the fusing phase of the distribution transformer in the power grid system is the C phase, judging whether the voltage amplitude corresponding to the zero load state of the B phase is the same as the voltage amplitude corresponding to the zero load state of the C phase; if the voltage amplitude corresponding to the phase B in the zero load state is the same as the voltage amplitude corresponding to the phase C in the zero load state, the structure of a core column in a distribution transformer in the power grid system is a three-phase five-column type; and if the voltage amplitude corresponding to the phase B in the zero load state is different from the voltage amplitude corresponding to the phase C in the zero load state, the structure of the iron core column in the distribution transformer in the power grid system is a three-phase three-column type.
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