CN117347779A - Method for power distribution network trial power transmission and fault finding and power supply system - Google Patents
Method for power distribution network trial power transmission and fault finding and power supply system Download PDFInfo
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- CN117347779A CN117347779A CN202311228276.0A CN202311228276A CN117347779A CN 117347779 A CN117347779 A CN 117347779A CN 202311228276 A CN202311228276 A CN 202311228276A CN 117347779 A CN117347779 A CN 117347779A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000005540 biological transmission Effects 0.000 title claims abstract description 14
- 230000007935 neutral effect Effects 0.000 claims description 3
- 230000009194 climbing Effects 0.000 abstract description 3
- 230000001681 protective effect Effects 0.000 abstract description 3
- 238000004804 winding Methods 0.000 description 7
- 238000004088 simulation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
Abstract
The invention relates to a method and a power supply system for power distribution network trial power transmission and fault finding, wherein the power supply system is connected with a three-phase transformer connected with Dyn11 in a power distribution station area, a three-phase alternating current power supply is connected to the low-voltage side of the transformer, the amplitude and phase relation of the output voltage of the three-phase alternating current power supply are established, when the three-phase alternating current power supply is injected into any two phases of the output voltage of the low-voltage side, which have the same frequency and the same amplitude and have 180 degrees of phase difference, and the output voltage of the other phase is 0, the voltage of one phase of the high-voltage side of the three-phase transformer connected with Dyn11 can be enabled to be 0, so that leakage current can be conveniently found by utilizing the voltage of one phase of the high-voltage side subsequently, and fault points can be detected. The method is high in safety, various means such as protective measures are simplified, climbing of a rod is not needed when the low-pressure side is pressurized, and efficiency is greatly improved.
Description
Technical Field
The invention relates to the technical field of distribution line fault positioning, in particular to a method and a power supply system for distribution network trial power transmission and fault finding.
Background
With the development of economy and society, the demands and the dependence of social production and people's life on electric power are increasing, and electric power has become an indispensable energy source in human life, work and study. The distribution network circuit is taken as an important component of the whole distribution network system and directly bears the power supply tasks of various users, and the reliable power supply capability and quality are particularly important. Once the distribution line or the equipment is in a problem, the whole power system is easy to fail or break down, so that the normal life electricity utilization of residents is affected, and the smooth development of economy is hindered.
The distribution system has a plurality of branches and complex wiring, and can not accurately position fault points when distribution faults occur, so that the fault positioning time is too long, which is a difficult problem for distribution production. At present, aiming at fault location of a distribution network line, a power supply is generally directly injected into a high-voltage side of a distribution transformer area by a traditional method so as to perform fault finding and power transmission trial operation in a leakage current detection mode, however, measures such as high-voltage protection are required to be performed in the mode, and therefore safety and detection efficiency of the distribution network line are not effectively guaranteed.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method and a power supply system for power distribution network trial power transmission and fault finding. The specific technical scheme is as follows:
the power supply system for power distribution network trial power transmission and fault finding comprises a Dyn 11-connected three-phase transformer and a three-phase alternating current power supply, wherein the three-phase alternating current power supply is connected with the low-voltage side of the Dyn 11-connected three-phase transformer, the three-phase alternating current power supply can inject output three-phase voltage into the low-voltage side of the Dyn 11-connected three-phase transformer, any two of the output three-phase voltages have the same frequency, the same amplitude and 180 degrees phase difference, and meanwhile, the other phase voltage is 0.
Further, the high-voltage side of the Dyn 11-connected three-phase transformer is in a triangular connection, the low-voltage side is in a star connection, and the neutral point of the low-voltage side is connected with the ground.
Further, the voltage amplitude and the phase of the three-phase alternating current power supply can be adjusted.
Meanwhile, the invention also provides a method for power distribution network trial power transmission and fault finding, which uses the system and comprises the following specific steps:
s1, outputting three-phase voltage through a three-phase alternating current power supply, and injecting the output three-phase voltage into the low-voltage side of a three-phase transformer connected with Dyn 11;
s2, adjusting the amplitude and the phase of the three-phase voltage injected into the low-voltage side to enable a certain phase of the high-voltage side of the three-phase transformer connected with Dyn11 to have voltage, and the other two voltages are 0;
s3, utilizing the voltage existing in a certain phase on the high-voltage side of the three-phase transformer connected with Dyn11, using a detector to find leakage current, and if the leakage current exists, finding the fault position according to the leakage current.
Further, in step S2, the amplitude and phase of the three-phase voltage injected into the low-voltage side are adjusted so that any two of the three-phase voltages output by the three-phase ac power supply have the same frequency and the same amplitude and phase difference of 180 °, and the other phase voltage is 0.
Further, any two phase voltages in the three-phase voltages have the same frequency and the same amplitude and have 180 degrees of phase difference, meanwhile, the other phase voltage is 0, so that the A phase output voltage and the C phase output voltage injected into the low-voltage side have the same frequency and the same amplitude and have 180 degrees of phase difference, meanwhile, the B phase output voltage is 0, correspondingly, the node 1 voltage of the high-voltage side is not 0, and the node 2 voltage and the node 3 voltage are 0.
Further, any two phase voltages in the three-phase voltages have the same frequency and the same amplitude and have 180 degrees of phase difference, meanwhile, the other phase voltage is 0, so that the B phase output voltage and the A phase output voltage injected into the low-voltage side have the same frequency and the same amplitude and have 180 degrees of phase difference, meanwhile, the C phase output voltage is 0, correspondingly, the voltage of the node 2 at the high-voltage side can be made to be different from 0, and the voltage of the node 1 and the node 3 are made to be 0.
Further, any two phase voltages in the three-phase voltages have the same frequency and the same amplitude and have 180 degrees of phase difference, meanwhile, the other phase voltage is 0, so that the C phase output voltage and the B phase output voltage injected into the low-voltage side have the same frequency and the same amplitude and have 180 degrees of phase difference, meanwhile, the A phase output voltage is 0, correspondingly, the voltage of the node 3 at the high-voltage side can be made to be different from 0, and the voltage of the node 1 and the node 2 are made to be 0.
The beneficial effects of the invention are as follows: according to the method and the power supply system for power distribution network trial power transmission and fault finding, the three-phase voltage is injected into the low-voltage side of the three-phase transformer connected with Dyn11 through the three-phase alternating current power supply with adjustable voltage amplitude and phase, the injected three-phase voltage meets the conditions that any two phases of voltages have the same frequency and the same amplitude and are 180 degrees different in phase, the other phase of voltage is 0, a certain phase of voltage on the high-voltage side exists, the other two phases of voltages are 0, accordingly leakage current can be conveniently found by utilizing the voltage existing on the certain phase on the high-voltage side, and fault points are detected. The power supply system and the method used are high in safety, good in mobility, flexible in access and simplified in various procedures such as protective measures; meanwhile, the climbing rod is not needed when the low pressure side is pressurized, and the efficiency is greatly improved.
Drawings
FIG. 1 is a schematic diagram of a connection of a power system for distribution network test power delivery and fault finding according to the present disclosure;
FIG. 2 is a high voltage phasor diagram of a Dyn11 coupled three-phase transformer in the disclosed power system;
FIG. 3 is a simulation model diagram of the disclosed power supply system;
FIG. 4 is a waveform of the Dyn11 linked three-phase transformer low-side winding voltage in a simulation model of the disclosed power supply system;
FIG. 5 is a waveform of the high side winding voltage of a Dyn11 coupled three-phase transformer in a simulation model of the disclosed power supply system;
fig. 6 is a flow chart of a method for power distribution network test delivery and fault finding in accordance with the present disclosure.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings provided by the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present invention are included in the protection scope of the present invention.
Example 1: referring to fig. 1, the invention provides a power supply system for power distribution network trial power transmission and fault finding, which comprises a three-phase transformer connected with a Dyn11 of a power distribution area, wherein the high-voltage side of the transformer is in a delta connection method, the low-voltage side of the transformer is in a star connection method, the neutral point of the low-voltage side is connected with the ground, and meanwhile, the low-voltage side is connected with a three-phase alternating current power supply for standard output, and the voltage amplitude, the phase and the like of the three-phase alternating current power supply can be manually adjusted. Wherein the three-phase ac power supply is used to inject the output three-phase voltage to the low-voltage side of the transformer, and the Dyn 11-coupled three-phase transformer is used to adjust the voltage of the high-voltage side according to the magnitude and phase of the injected voltage of the low-voltage side.
Specifically, the connection mode of the three-phase transformer connected by Dyn11 shown in FIG. 1 can be known that the voltage phasor diagram at the high and low voltage sides is shown in FIG. 2, when the low voltage side is connected with three-phase power sources with different amplitudes and different frequencies, there are
In the middle ofRepresenting complex voltages between AX, BY, CZ, respectively, < >>Representing the complex voltages between nodes 1 and 2, nodes 2 and 3, nodes 3 and 1, n representing the transformation ratio of the three-phase transformer, +.>Representing the complex voltage output by a three-phase ac power supply.
To ensure that the voltage at one node on the high-voltage side of the three-phase transformer with Dyn11 junction is not 0, the other two nodes are 0, and several assumptions are made below:
(1) if the voltage of the high-voltage side node 1 is not 0 and the voltages of the nodes 2 and 3 are 0, the following can be obtained
u AX +u CZ ＝0 (4)
V 2 ＝V 3 ＝0 (5)
U in the formula AX And u CZ The ac voltages between AX and CZ are shown, and V2 and V3 are the voltages of the high-voltage side node 2 and node 3, respectively. From the formulae (1) to (5), it is understood that the A-phase output and C-phase output at the low-pressure side are required to satisfy
V a ＝-V c And V is b ＝0 (6)
The three-phase alternating current power supply is injected into the phase A output voltage and the phase C output voltage at the low voltage side, which have the same frequency and the same amplitude and are 180 degrees different in phase, and meanwhile, the phase B output voltage is 0.
(2) If the voltage of the high-voltage side node 2 is not 0 and the voltages of the nodes 1 and 3 are 0, the following can be obtained
u BY +u AX ＝0 (7)
V 1 ＝V 3 ＝0 (8)
U in the formula BY And u AX The ac voltages between BY and AX are indicated, and V1 and V3 indicate the voltages of the high-voltage side node 1 and node 3, respectively. From the formulae (1) to (3) (7) to (8), it is clear that the B-phase output and A-phase output at the low pressure side are required to satisfy
V b ＝-V a And V is c ＝0 (9)
The three-phase alternating current power supply is injected into the B-phase output voltage and the A-phase output voltage at the low voltage side, the same frequency and the same amplitude are different by 180 degrees, and meanwhile, the C-phase output voltage is 0.
(3) If the voltage of the high-voltage side node 3 is not 0 and the voltages of the node 1 and the node 2 are 0, the following can be obtained
u CZ +u BY ＝0 (10)
V 1 ＝V 2 ＝0 (11)
U in the formula CZ And u BY The ac voltages between CZ and BY are shown, and V1 and V2 represent the voltages of the high-voltage side node 1 and node 2, respectively. From the formulae (1) to (3) (10) to (11), the low-pressure side C-phase output and B-phase output are required to satisfy
V c ＝-V b And V is a ＝0 (12)
The three-phase alternating current power supply is injected into the C-phase output voltage and the B-phase output voltage at the low voltage side, the same frequency and the same amplitude are different by 180 degrees, and meanwhile, the A-phase output voltage is 0.
Therefore, if the three-phase ac power supply injects three-phase voltages into the low-voltage side of the three-phase transformer connected with Dyn11, and simultaneously establishes a relationship between the amplitude and the phase of the three-phase voltages, so that when any two voltages injected into the low-voltage side have the same frequency and the same amplitude, the phase difference is 180 degrees, and the other phase voltage is 0, at the moment, a certain phase of the high-voltage side of the three-phase transformer connected with Dyn11 has voltage, and the other two voltages are 0, so that the voltage existing in the certain phase of the high-voltage side can be used for searching leakage current, and if the leakage current exists, the position where the fault occurs can be found. The power supply system is high in safety, various means such as protective measures are simplified, climbing of a pole is not needed when the low-voltage side is pressurized, and efficiency is greatly improved.
Referring to fig. 3, a PSIM simulation model is constructed, in which three-phase voltages vb=0, va= -Vc injected into the low-voltage side of the Dyn 11-connected three-phase transformer are set, simulation is started, a voltage waveform of the low-voltage side winding of the Dyn 11-connected three-phase transformer is shown in fig. 4, a voltage waveform of the high-voltage side winding is shown in fig. 5, and it is easy to find that when the winding voltage V of the low-voltage side winding is ax ＝V a 、V by ＝V b 、V cz ＝V c At the time, the corresponding winding voltage V at the high voltage side AX ＝-V CZ ,V BY =0, the above conclusion was further verified.
Embodiment 2 referring to fig. 6, the present embodiment provides a method for power distribution network test power transmission and fault finding, which specifically includes the following steps:
s1, outputting three-phase voltage through a three-phase alternating current power supply, and injecting the output three-phase voltage into the low-voltage side of a three-phase transformer connected with Dyn 11;
s2, adjusting the amplitude and the phase of the three-phase voltage injected into the low-voltage side to enable a certain phase of the high-voltage side of the three-phase transformer connected with Dyn11 to have voltage, and the other two voltages are 0;
optionally, the same frequency and the same amplitude of the A-phase output voltage and the C-phase output voltage of the low-voltage side of the three-phase transformer connected by the Dyn11 are enabled to be different by 180 degrees, the B-phase output voltage is 0, the node 1 voltage of the high-voltage side of the three-phase transformer connected by the Dyn11 is enabled to be different from 0, and the node 2 voltage and the node 3 voltage are enabled to be 0; the B phase output voltage and the A phase output voltage of the low-voltage side of the three-phase transformer connected by the injection Dyn11 have the same frequency and the same amplitude and have 180 degrees of phase difference, the C phase output voltage is 0, the node 2 voltage of the high-voltage side of the three-phase transformer connected by the Dyn11 can be made to be different from 0, and the node 1 voltage and the node 3 voltage are made to be 0; the C-phase output voltage and the B-phase output voltage of the low-voltage side of the three-phase connected with Dyn11 are equal in frequency and amplitude and are 180 degrees different in phase, the A-phase output voltage is 0, the node 3 voltage of the high-voltage side of the three-phase transformer connected with Dyn11 is not 0, and the node 1 voltage and the node 2 voltage are 0.
S3, utilizing the voltage existing in a certain phase on the high-voltage side of the three-phase transformer connected with Dyn11, using a detector to find leakage current, and if the leakage current exists, finding the fault position according to the leakage current.
Optionally, the leakage current detector is used to find out whether leakage current exists in the circuit, if no leakage current exists, no fault occurs in the circuit, and if the leakage current exists, the fault position can be found out according to the leakage current.
It will be appreciated by those skilled in the art that the invention can be embodied in many other specific forms without departing from the spirit or scope of the invention. It is to be understood that the invention is not limited to this embodiment and that variations and modifications may be effected by one skilled in the art within the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A power supply system for distribution network test power transmission and fault finding is characterized in that: the system comprises a Dyn 11-connected three-phase transformer and a three-phase alternating current power supply, wherein the three-phase alternating current power supply is connected with the low-voltage side of the Dyn 11-connected three-phase transformer, the three-phase alternating current power supply can inject output three-phase voltage into the low-voltage side of the Dyn 11-connected three-phase transformer, any two of the output three-phase voltages have the same frequency, the same amplitude and 180 degrees phase difference, and meanwhile, the other phase voltage is 0.
2. The power supply system for distribution network test power transmission and fault finding according to claim 1, wherein the high-voltage side of the Dyn 11-connected three-phase transformer is a delta connection, the low-voltage side is a star connection, and the neutral point of the low-voltage side is connected with the ground.
3. The power supply system for distribution network trial power transmission and fault finding according to claim 1, wherein the voltage amplitude and phase of the three-phase alternating current power supply can be adjusted.
4. A method for distribution network trial power delivery and fault finding using a system as claimed in any one of claims 1 to 3, comprising the steps of:
s1, outputting three-phase voltage through a three-phase alternating current power supply, and injecting the output three-phase voltage into the low-voltage side of a three-phase transformer connected with Dyn 11;
s2, adjusting the amplitude and the phase of the three-phase voltage injected into the low-voltage side to enable a certain phase of the high-voltage side of the three-phase transformer connected with Dyn11 to have voltage, and the other two voltages are 0;
s3, utilizing the voltage existing in a certain phase on the high-voltage side of the three-phase transformer connected with Dyn11, using a detector to find leakage current, and if the leakage current exists, finding the fault position according to the leakage current.
5. The method for distribution network trial power delivery and fault finding of claim 4, wherein: in step S2, the amplitude and phase of the three-phase voltage injected into the low-voltage side are adjusted to make any two of the three-phase voltages output by the three-phase ac power supply have the same frequency and the same amplitude and phase difference of 180 °, and the other phase voltage is 0.
6. The method for distribution network trial power delivery and fault finding of claim 5, wherein: any two phase voltages in the three-phase voltages have the same frequency and the same amplitude and have 180 degrees of phase difference, meanwhile, the other phase voltage is 0, so that the A phase output voltage and the C phase output voltage injected into the low-voltage side have the same frequency and the same amplitude and have 180 degrees of phase difference, meanwhile, the B phase output voltage is 0, the corresponding voltage of the node 1 at the high-voltage side can be made to be different from 0, and the voltage of the node 2 and the node 3 are made to be 0.
7. The method for distribution network trial power delivery and fault finding of claim 5, wherein: any two phase voltages in the three-phase voltages have the same frequency and the same amplitude and have 180 degrees of phase difference, meanwhile, the other phase voltage is 0, the B phase output voltage and the A phase output voltage injected into the low-voltage side have the same frequency and the same amplitude and have 180 degrees of phase difference, meanwhile, the C phase output voltage is 0, the corresponding voltage of the node 2 at the high-voltage side can be made to be different from 0, and the voltage of the node 1 and the node 3 are made to be 0.
8. The method for distribution network trial power delivery and fault finding of claim 5, wherein: any two phase voltages in the three-phase voltages have the same frequency and the same amplitude and have 180 degrees of phase difference, meanwhile, the other phase voltage is 0, so that the C phase output voltage and the B phase output voltage injected into the low-voltage side have the same frequency and the same amplitude and have 180 degrees of phase difference, meanwhile, the A phase output voltage is 0, the corresponding voltage of the node 3 at the high-voltage side can be made to be different from 0, and the voltage of the node 1 and the node 2 are made to be 0.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311228276.0A CN117347779A (en) | 2023-09-22 | 2023-09-22 | Method for power distribution network trial power transmission and fault finding and power supply system |
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| CN202311228276.0A CN117347779A (en) | 2023-09-22 | 2023-09-22 | Method for power distribution network trial power transmission and fault finding and power supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117630583A (en) * | 2024-01-26 | 2024-03-01 | 天津市天变航博电气发展有限公司 | Device and method for detecting capacitance current and grounding resistance of power distribution network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117630583A (en) * | 2024-01-26 | 2024-03-01 | 天津市天变航博电气发展有限公司 | Device and method for detecting capacitance current and grounding resistance of power distribution network |
| CN117630583B (en) * | 2024-01-26 | 2024-03-26 | 天津市天变航博电气发展有限公司 | Control method of power distribution network capacitance current and ground resistance detection device |
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