CN111913051B - Method for automatically adjusting phase sequence of power distribution network, monitoring unit and monitoring system - Google Patents
Method for automatically adjusting phase sequence of power distribution network, monitoring unit and monitoring system Download PDFInfo
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- G01R29/18—Indicating phase sequence; Indicating synchronism
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Abstract
The invention relates to a method, a monitoring unit and a monitoring system for automatically adjusting a phase sequence of a power distribution network. A method for automatically adjusting phase sequence of a low-voltage three-phase power distribution network comprises the following steps: s1, respectively connecting the three-phase voltage to A \ B \ C voltage input terminals of the low-voltage monitoring unit; s2, the low-voltage monitoring unit synchronously acquires a plurality of cycle original sampling point data of three-phase voltage through an A \ B \ C voltage detection channel corresponding to an A \ B \ C voltage input terminal, each cycle carries out n times of sampling, each time of sampling forms a sampling point, and a sampling array of the sampling point data of the three-phase voltage cycle is respectively formed. According to the invention, the automatic matching of the phase sequence can be realized by using software data processing without additionally increasing hardware cost, the workload of construction wiring can be effectively reduced, detection errors can be detected, the operation and maintenance efficiency of products can be improved, the operation and maintenance cost of equipment can be reduced, and the method has important significance for convenience and popularization of low-voltage power distribution monitoring.
Description
Technical Field
The invention relates to power distribution phase sequence detection and adjustment, in particular to a method, a monitoring unit and a monitoring system for automatically adjusting a phase sequence of a power distribution network.
Background
At present, extensively install low pressure monitoring unit in low voltage distribution network, every branch monitoring unit is fixed with ABC three-phase voltage, electric current access terminal, normally when the erection equipment, need correspond the A, B, C three-phase access terminal that inserts low pressure monitoring unit respectively with the A, B, C three-phase of actual circuit. In the actual operation process of an installer on site, because the A, B, C three-phase cables in part of the branch boxes are not marked according to three colors of yellow, green and red, the installer cannot accurately identify the real phase sequence, and finally, the actually accessed phase sequence is inconsistent with the marked phase sequence of the low-voltage monitoring unit; if the access phase sequences are inconsistent, data abnormity is caused, and problems of metering error, line loss analysis abnormity, fault positioning error and the like are caused. For the phase sequence access error, the engineer is difficult to find, so that the operation and maintenance cost of the product can be effectively reduced by improving the wiring efficiency, and the method has very important significance for popularization and use of the product.
Patent document ZL201210552542.0 discloses a method for automatically adjusting phase sequence wiring errors, and belongs to the technical field of transmission and distribution network application. The method is provided with a counter, and one phase is arbitrarily defined as an A phase, and the other two phases are respectively a B phase and a C phase; triggering interruption when A, B, C three-phase voltage passes through zero in sequence through a hardware zero indicator, and setting the value of a counter to judge whether the defined ABC three-phase is the actual ABC three-phase; and the phase sequence wiring error can be automatically adjusted through the controller. The method can automatically adjust and adapt to external wiring, detect wiring errors and reduce the workload of construction wiring.
When the low-voltage monitoring unit is installed in the low-voltage distribution network, the low-voltage monitoring unit is generally installed in a power failure mode, and when the low-voltage monitoring unit is installed in the power failure mode, the specific A \ B \ C phase sequence of the line without the identification is difficult to distinguish; and (3) recovering power supply after the equipment is installed, if the equipment wiring error is found, and the phase sequence of the equipment end identification is inconsistent with the phase sequence of the actual line, the problems of metering error, line loss analysis, fault positioning abnormity and the like are caused, and at the moment, the power company is required to rearrange the power failure plan, and then the power construction personnel is dispatched to the equipment site to disassemble and connect the equipment again. The whole process consumes manpower and material resources, frequent power failure easily causes customer's power consumption complaints, and is not favorable to the popularization and use of low pressure monitoring unit in the distribution network.
Therefore, the existing power distribution network detection and phase sequence adjustment have defects and need to be improved and improved.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a method, a monitoring unit and a monitoring system for automatically adjusting a phase sequence of a power distribution network, which can automatically identify the phase sequence of a power distribution circuit connected to a low-voltage monitoring unit and can automatically adjust.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for automatically adjusting phase sequence of a low-voltage three-phase power distribution network comprises the following steps:
s1, respectively connecting the three-phase voltage to A \ B \ C voltage input terminals of the low-voltage monitoring unit;
s2, the low-voltage monitoring unit synchronously acquires a plurality of cycle original sampling point data of three-phase voltage through an A \ B \ C voltage detection channel corresponding to an A \ B \ C voltage input terminal, each cycle is sampled for n times, each sampling point forms a sampling point, and a sampling array of the sampling point data of the three-phase voltage cycle is formed respectively;
s3, the low-voltage monitoring unit respectively finds out the first zero data changed from a negative value to a positive value in the sampling array of each phase voltage to obtain the sampling serial numbers of the 3 zero data in the sampling array;
s4, obtaining angle differences between the initial phase angles of the voltages detected by the A voltage detection channel and the initial phase angles of the voltages detected by the B \ C voltage detection channel respectively according to the 3 sampling serial numbers;
s5, obtaining a judgment phase angle value of the three-phase voltage by taking the initial phase angle of the voltage detected by the A voltage detection channel as a reference according to the angle difference and the phase angle relation between the three-phase voltages;
s6, determining whether the input of the three-phase voltage is a positive phase sequence or not according to the determined phase angle value, and if so, finishing the adjustment; if not, adjusting the detection data of the A \ B \ C voltage detection channel according to the judgment phase angle value of the three-phase voltage, and executing the step S2.
Preferably, in the method for automatically adjusting the phase sequence of the low-voltage three-phase power distribution network, in step S4, the calculation formula of the phase angle difference is as follows:
wherein, ΔMAIs the phase angle difference between the voltage detected by the M phase voltage detection channel and the voltage detected by the A phase voltage detection channel; dMSampling serial numbers of zero crossing point data of the M phase voltage detection channels; m is B or C; dASampling serial numbers of zero crossing point data of the A phase voltage detection channel; and n is the sampling times of each cycle.
Preferably, in the method for automatically adjusting the phase sequence of the low-voltage three-phase power distribution network, in step S5, the equation for determining the phase angle value is as follows:
Ui1＝UA0+△MA±N*2π；
wherein, Ui1A determination phase angle value for the voltage detected by the i-phase voltage detection channel; i is A \ B \ C; u shapeA0Detecting an initial phase angle of a channel for the A phase voltage; m is B or C; deltaMAIs the phase angle difference; n is a matching weight value, so that the judgment phase angle value belongs to [ -pi, pi]。
Preferably, in step S6, the step of determining whether the input of the three-phase voltage is positive phase sequence includes:
s61, arranging the judgment phase angle values of the three-phase voltage according to the sequence of the A \ B \ C voltage detection channels;
s62, judging whether the sequence is a positive-phase sequence or not, and if so, finishing the adjustment; if not, go to step S63;
s63, judging whether the sequence of A \ B \ C voltage detection channels is AC reverse, AB reverse or BC reverse;
when the AC is determined to be reverse, exchanging data of the A-phase voltage detection channel and the C-phase voltage detection channel;
when the AB reverse direction is judged, exchanging data of the A-phase voltage detection channel and the B-phase voltage detection channel;
and when the BC is determined to be in the reverse direction, exchanging data of the C-phase voltage detection channel and the B-phase voltage detection channel.
In a preferred method for automatically adjusting the phase sequence of the low-voltage three-phase power distribution network, in step S62, a maximum deviation value α is set, and the following determination operations are performed on the determined phase angle values of the three-phase voltages:
when U is turnedA1∈(0±α),
When the voltage is detected to be positive phase sequence, the A \ B \ C three-phase voltage detection channel of the low-voltage monitoring unit detects that the access voltage is positive phase sequence;
when U is turnedA1∈(0±α),
When the voltage is detected to be in a BC reverse order by the A \ B \ C three-phase voltage detection channel of the low-voltage monitoring unit;
when in use
UB1∈(0±α),
When the voltage is detected to be in an AB reverse order by the A \ B \ C three-phase voltage detection channel of the low-voltage monitoring unit;
when in use
UC1When the electric potential belongs to (0 +/-alpha), the low-voltage monitoring unit A \ B \ C three-phase voltage detection channel detects that the access voltage is in a positive phase sequence;
when in use
UB1∈(0±α),
When the voltage is detected to be positive phase sequence, the A \ B \ C three-phase voltage detection channel of the low-voltage monitoring unit detects that the access voltage is positive phase sequence;
when in use
UC1When the element belongs to (0 +/-alpha), the low-voltage monitoring unit A \ B \ C three-phase voltage detection channel detects that the access voltage is in an AC reverse order.
Preferably, in the method for automatically adjusting the phase sequence of the low-voltage three-phase power distribution network, the value range of the maximum deviation value alpha is
In a preferred method for automatically adjusting the phase sequence of the low-voltage three-phase power distribution network, in step S2, the sampling number n of each cycle is 50-200.
A low-voltage monitoring unit comprises a processor, an A \ B \ C voltage input terminal and an A \ B \ C voltage detection channel; the A \ B \ C voltage detection channel is respectively in adaptive connection with the A \ B \ C voltage input terminal and is respectively connected with the processor.
In the preferred low-voltage monitoring unit, the A \ B \ C voltage detection channels all adopt the same voltage detection channel;
the voltage detection channel comprises a voltage transformer and an analog-to-digital converter; the voltage transformer is used for detecting voltage data of an input voltage point, and the analog-to-digital converter is connected with the voltage transformer; the analog-to-digital converter is connected with the processor.
A low-voltage three-phase power distribution network monitoring system is characterized in that any low-voltage monitoring unit is used for constructing a power distribution network monitoring topology system.
Compared with the prior art, the method for automatically adjusting the phase sequence of the power distribution network, the monitoring unit and the monitoring system provided by the invention have the advantages that the hardware cost is not additionally increased, the automatic matching of the phase sequence can be realized by using software data processing, the workload of construction wiring can be effectively reduced, the detection error is detected, the operation and maintenance efficiency of a product is improved, the operation and maintenance cost of equipment is reduced, and the method has important significance for the convenience and popularization of low-voltage power distribution monitoring.
Drawings
Fig. 1 is a flow chart of a method for automatically adjusting a phase sequence of a low-voltage three-phase power distribution network provided by the invention;
FIG. 2 is a diagram of the zero data position in the three-phase voltage cycle provided by the present invention;
fig. 3 is a block diagram of a low voltage monitoring unit according to the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 3, the present invention provides a method for automatically adjusting a phase sequence of a low-voltage three-phase power distribution network, including the steps of:
s1, respectively connecting the three-phase voltage to the A \ B \ C voltage input terminal 2 of the low-voltage monitoring unit;
s2, the low-voltage monitoring unit synchronously acquires a plurality of cycle original sampling point data of three-phase voltage through an A \ B \ C voltage detection channel 3 corresponding to an A \ B \ C voltage input terminal 2, each cycle carries out n times of sampling, each time of sampling forms a sampling point, and a sampling array of the sampling point data of the three-phase voltage cycle is respectively formed; preferably, in this embodiment, in step S2, the number of sampling times n per cycle is 50 to 200, and preferably n is 80.
S3, the low-voltage monitoring unit respectively finds out the first zero data changed from a negative value to a positive value in the sampling array of each phase voltage to obtain the sampling serial numbers of the 3 zero data in the sampling array;
s4, obtaining angle differences between the initial phase angles of the voltages detected by the A voltage detection channel and the initial phase angles of the voltages detected by the B \ C voltage detection channel respectively according to the 3 sampling serial numbers;
s5, obtaining a judgment phase angle value of the three-phase voltage by taking the initial phase angle of the voltage detected by the A voltage detection channel as a reference according to the angle difference and the phase angle relation between the three-phase voltages;
s6, determining whether the input of the three-phase voltage is a positive phase sequence or not according to the determined phase angle value, and if so, finishing the adjustment; if not, adjusting the detection data of the A \ B \ C voltage detection channel 3 according to the judgment phase angle value of the three-phase voltage, and executing the step S2.
Preferably, the low-voltage monitoring unit is a low-voltage monitoring device commonly used in the field, as long as the low-voltage monitoring unit can detect the voltage value of the line and has a certain data processing capability, and the problem of wrong connection of the three-phase line in the power distribution network may occur when the low-voltage monitoring unit is installed on the three-phase line can be quickly identified and the problem of data use of the phase sequence can be quickly identified and adjusted by using the steps S1-S6. Preferably, the process of determining or calculating by using the low pressure monitoring unit in kansu province can be processed by using the processor 1, and here, the processor 1 is also a common processing unit of the low pressure detection unit, and does not need to be added additionally.
Specifically, when assembling the distribution line, the distribution line is generally installed in a power failure mode, and when a phase line is connected to the voltage detection unit, the problem that reverse connection exists between the connected phase lines is caused by considering that a/B/C three-phase voltage may not be injected into the distribution line according to a set sequence, or the implemented working personnel are not strong in the corresponding phase line identification capability. The method for automatically adjusting the phase sequence provided by the invention only needs to connect a phase line into the low-voltage detection unit, at the moment, the low-voltage monitoring unit firstly starts to detect the connected three-phase voltage at the same time, the detection time length is the time length of two or more complete voltage cycles, under the general condition that the standard alternating current is 50Hz, the time of each voltage cycle is 20ms, the realization method is that the voltage value is detected once through the time with the same interval, and each cycle detects n voltage values, so that a sampling array of each phase line is formed respectively; then, the detection data obtained from each phase line is screened, the first zero data changed from a negative value to a positive value in each phase line is respectively found, then calculation is carried out according to the position sequence numbers of the three zero data in the respective sampling array, namely the sampling sequence numbers, the judgment phase angle value is obtained through calculation according to the existing three-phase line access sequence, then the corresponding positive phase sequence or the negative phase sequence can be judged, then the corresponding internal replacement data is executed, the automatic adjustment of the phase sequence data is realized, and the automatic adjustment of the phase sequence is realized.
Preferably, in this embodiment, in step S4, the calculation formula of the phase angle difference is:
wherein, ΔMADetecting the voltage detected by the M phase voltage detection channel and the A phase voltageMeasuring the phase angle difference between the voltages detected by the channels; dMSampling serial numbers of zero crossing point data of the M phase voltage detection channels; m is B or C; dASampling serial numbers of zero crossing point data of the A phase voltage detection channel; and n is the sampling times of each cycle.
Preferably, in this embodiment, in step S5, the equation for calculating the determination angle value is as follows:
Ui1＝UA0+△MA±N*2π；
wherein, Ui1A determination phase angle value for the voltage detected by the i-phase voltage detection channel; i is A \ B \ C; u shapeA0Detecting an initial phase angle of a channel for the A phase voltage; m is B or C; deltaMAIs the phase angle difference; n is a matching weight value, so that the judgment phase angle value belongs to [ -pi, pi]. It should be noted that, currently, the power system usually uses a three-phase system (a \ B \ C) for power supply, where the a-phase voltage leads the B-phase voltage
Leading phase B to phase C
C phase leading A phase
The phase angle value is determined by classifying the initial point of the detected voltage cycle in the three-phase line into [ - π, π]So that the three are unified [ -pi, pi [ -pi-]Comparison in the range, e.g. by detecting and calculating the determined phase angle values of the three-phase voltages as UA1＝0°、
The result is positive phase sequence, and the values obtained after normalization by using the judgment phase angle value calculation formula are respectively UA1＝0°、
Preferably, in this embodiment, in step S6, the step of determining whether the input of the three-phase voltage is in the positive phase sequence includes:
s61, arranging the judgment phase angle values of the three-phase voltage according to the sequence of the A \ B \ C voltage detection channels 3;
s62, judging whether the sequence is a positive-phase sequence or not, and if so, finishing the adjustment; if not, go to step S63;
s63, judging the sequence arrangement of the A \ B \ C voltage detection channel 3 to be any one of AC reverse direction, AB reverse direction and BC reverse direction;
when the AC is determined to be reverse, exchanging data of the A-phase voltage detection channel and the C-phase voltage detection channel;
when the AB reverse direction is judged, exchanging data of the A-phase voltage detection channel and the B-phase voltage detection channel;
and when the BC is determined to be in the reverse direction, exchanging data of the C-phase voltage detection channel and the B-phase voltage detection channel.
Preferably, in step S63, the low voltage monitoring unit stores the corresponding information after identifying the corresponding fault, and may directly call the data after the power distribution network is powered off and without a line replacement patch, and if there is a record or trace of line replacement line access, the method of automatically adjusting the phase sequence is executed again.
Preferably, in this embodiment, in consideration of a certain deviation of the phase angle of the actual line due to factors such as line impedance, load imbalance and error, in step S62, a maximum deviation value α is set, and as long as the determined phase angle value is within the maximum deviation value range of the determination threshold value, it is determined that the phase angle value is equal to the threshold value, and the following determination operations are performed on the determined phase angle values of the three-phase voltages:
when U is turnedA1∈(0±α),
When the voltage is detected to be positive phase sequence, the A \ B \ C three-phase voltage detection channel of the low-voltage monitoring unit detects that the access voltage is positive phase sequence;
when U is turnedA1∈(0±α),
When the voltage is detected to be in a BC reverse order by the A \ B \ C three-phase voltage detection channel of the low-voltage monitoring unit;
when in use
UB1∈(0±α),
When the voltage is detected to be in an AB reverse order by the A \ B \ C three-phase voltage detection channel of the low-voltage monitoring unit;
when in use
UC1When the electric potential belongs to (0 +/-alpha), the low-voltage monitoring unit A \ B \ C three-phase voltage detection channel detects that the access voltage is in a positive phase sequence;
when in use
UB1∈(0±α),
When the voltage is detected to be positive phase sequence, the A \ B \ C three-phase voltage detection channel of the low-voltage monitoring unit detects that the access voltage is positive phase sequence;
when in use
UC1When the element belongs to (0 +/-alpha), the low-voltage monitoring unit A \ B \ C three-phase voltage detection channel detects that the access voltage is in an AC reverse order.
Specifically, under normal conditions, if the a \ B \ C three-phase line is normally connected to the low-voltage monitoring unit, and the conditions of line impedance or load imbalance and the like are not considered, that is, the maximum deviation value is 0, and the alternating currents in the a \ B \ C three-phase line are input with a phase angle difference of 120 degrees, the phase angle values should be determined to be U respectivelyA1＝0,
Preferably, in this embodiment, the value range of the maximum deviation value α is
It is preferable that
The invention also provides a low-voltage monitoring unit which comprises a processor 1, an A \ B \ C voltage input terminal 2 and an A \ B \ C voltage detection channel 3; the A \ B \ C voltage detection channel 3 is respectively in adaptive connection with the A \ B \ C voltage input terminal 2 and is respectively connected with the processor 1. Preferably, the low-voltage monitoring unit works by using the method for automatically adjusting the phase sequence of the low-voltage three-phase power distribution network, so that whether the access of the line is wrong can be automatically identified as long as the distribution line is inserted into the low-voltage monitoring unit, the automatic adjustment of the phase sequence data acquisition of the distribution line can be automatically adjusted, and the data acquisition among the lines is prevented from being disordered.
As a preferable scheme, in this embodiment, the a \ B \ C voltage detection channels 3 all use the same voltage detection channel;
the voltage detection channel comprises a voltage transformer and an analog-to-digital converter; the voltage transformer is used for detecting voltage data of an input voltage point, and the analog-to-digital converter is connected with the voltage transformer; the analog-to-digital converter is connected with the processor 1. Here, the voltage detection channel is used for detecting the voltage of the voltage input electronic input;
the invention also provides a low-voltage three-phase power distribution network monitoring system, and a power distribution network monitoring topology system is constructed by using the low-voltage monitoring unit. The low-voltage monitoring unit builds a monitoring system according to a preset power distribution network monitoring topological structure without other limitations.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (5)
1. A method for automatically adjusting a phase sequence of a low-voltage three-phase power distribution network is characterized by comprising the following steps:
s1, respectively connecting the three-phase voltage to A \ B \ C voltage input terminals of the low-voltage monitoring unit;
s2, the low-voltage monitoring unit synchronously acquires a plurality of cycle original sampling point data of three-phase voltage through an A \ B \ C voltage detection channel corresponding to an A \ B \ C voltage input terminal, each cycle is sampled for n times, each sampling point forms a sampling point, and a sampling array of the sampling point data of the three-phase voltage cycle is formed respectively;
s3, the low-voltage monitoring unit respectively finds out the first zero data changed from a negative value to a positive value in the sampling array of each phase voltage to obtain the sampling serial numbers of the 3 zero data in the sampling array;
s4, obtaining angle differences between the initial phase angles of the voltages detected by the A voltage detection channel and the initial phase angles of the voltages detected by the B \ C voltage detection channel respectively according to the 3 sampling serial numbers;
s5, obtaining a judgment phase angle value of the three-phase voltage by taking the initial phase angle of the voltage detected by the A voltage detection channel as a reference according to the angle difference and the phase angle relation between the three-phase voltages;
s6, determining whether the input of the three-phase voltage is a positive phase sequence or not according to the determined phase angle value, and if so, finishing the adjustment; if not, adjusting the detection data of the A \ B \ C voltage detection channel according to the judgment phase angle value of the three-phase voltage, and executing the step S2;
in step S4, the calculation formula of the angle difference is:
wherein, DeltaMAIs an angle difference between the voltage detected by the M-phase voltage detection channel and the voltage detected by the A-phase voltage detection channel; dMFor detecting M-phase voltageMeasuring a sampling sequence number of the zero-crossing data of the channel; m is B or C; dASampling serial numbers of zero crossing point data of the A phase voltage detection channel; n is the sampling times of each cycle;
in step S5, the equation for calculating the angle value is:
Ui1＝UA0+ΔMA±N*2π；
wherein, Ui1A determination phase angle value for the voltage detected by the i-phase voltage detection channel; i is A \ B \ C; u shapeA0Detecting an initial phase angle of a channel for the A phase voltage; m is B or C; deltaMAIs the angle difference; n is a matching weight value, so that the judgment phase angle value belongs to [ -pi, pi]；
In step S6, the step of determining whether the input of the three-phase voltage is in the positive phase sequence includes:
s61, arranging the judgment phase angle values of the three-phase voltage according to the sequence of the A \ B \ C voltage detection channels;
s62, judging whether the sequence is a positive-phase sequence or not, and if so, finishing the adjustment; if not, go to step S63;
s63, judging whether the sequence of A \ B \ C voltage detection channels is AC reverse, AB reverse or BC reverse;
when the AC is determined to be reverse, exchanging data of the A-phase voltage detection channel and the C-phase voltage detection channel;
when the AB reverse direction is judged, exchanging data of the A-phase voltage detection channel and the B-phase voltage detection channel;
when the BC is determined to be in the reverse direction, exchanging data of a C-phase voltage detection channel and a B-phase voltage detection channel;
in step S62, the maximum deviation value is set
And executing the following determination operations on the determination phase angle values of the three-phase voltages:
when U is turnedA1∈(0±α),
When it is, then the low pressureThe monitoring unit A \ B \ C three-phase voltage detection channel detects that the access voltage is in a positive phase sequence;
when U is turnedA1∈(0±α),
When the voltage is detected to be in a BC reverse order by the A \ B \ C three-phase voltage detection channel of the low-voltage monitoring unit;
when in use
UB1∈(0±α),
When the voltage is detected to be in an AB reverse order by the A \ B \ C three-phase voltage detection channel of the low-voltage monitoring unit;
when in use
UC1When the electric potential belongs to (0 +/-alpha), the low-voltage monitoring unit A \ B \ C three-phase voltage detection channel detects that the access voltage is in a positive phase sequence;
when in use
UB1∈(0±α),
When the voltage is detected to be positive phase sequence, the A \ B \ C three-phase voltage detection channel of the low-voltage monitoring unit detects that the access voltage is positive phase sequence;
when in use
UC1When the element belongs to (0 +/-alpha), the low-voltage monitoring unit A \ B \ C three-phase voltage detection channel detects that the access voltage is in an AC reverse order.
2. The method for automatically adjusting the phase sequence of the low-voltage three-phase power distribution network according to claim 1, wherein in step S2, the sampling number n of each cycle is 50-200.
3. A low-voltage monitoring unit using the method for automatically adjusting the phase sequence of the low-voltage three-phase power distribution network of claim 1 is characterized by comprising a processor, an A \ B \ C voltage input terminal and an A \ B \ C voltage detection channel; the A \ B \ C voltage detection channel is respectively in adaptive connection with the A \ B \ C voltage input terminal and is respectively connected with the processor.
4. The low-voltage monitoring unit according to claim 3, wherein the A \ B \ C voltage detection channels all use the same voltage detection channel;
the voltage detection channel comprises a voltage transformer and an analog-to-digital converter; the voltage transformer is used for detecting voltage data of an input voltage point, and the analog-to-digital converter is connected with the voltage transformer; the analog-to-digital converter is connected with the processor.
5. A low-voltage three-phase power distribution network monitoring system is characterized in that a power distribution network monitoring topology system is constructed by using the low-voltage monitoring unit of claim 4.
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2020
- 2020-05-25 CN CN202010447089.1A patent/CN111913051B/en active Active
- 2020-09-04 WO PCT/CN2020/113500 patent/WO2021237976A1/en active Application Filing
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| CN111913051A (en) | 2020-11-10 |
| WO2021237976A1 (en) | 2021-12-02 |
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