CN111157847A - Transient recording fault indicator installation phase sequence self-recognition method - Google Patents
Transient recording fault indicator installation phase sequence self-recognition method Download PDFInfo
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- CN111157847A CN111157847A CN202010015051.7A CN202010015051A CN111157847A CN 111157847 A CN111157847 A CN 111157847A CN 202010015051 A CN202010015051 A CN 202010015051A CN 111157847 A CN111157847 A CN 111157847A
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- 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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Abstract
A phase sequence self-recognition method for installing a transient wave recording fault indicator comprises the steps that the transient wave recording fault indicator and a bus zero sequence voltage starting device under the same bus periodically read time service, and all the transient wave recording fault indicators realize system time and sampling point position synchronization; the transient wave recording fault indicator circularly stores the current and electric field data of each phase; starting a triggering wave recording by a bus zero sequence voltage starting device, and acquiring current and electric field data by all transient wave recording fault indicators under the same bus; calculating the initial phases of the currents; taking the initial phase of the ABC three-phase transient wave recording indicator current at the lower outlet of the bus as a reference, and respectively comparing the phase differences of the currents of all other indicators; and determining the self phase and current direction coefficients of the transient recording indicator according to the phase difference. The invention has simple realization and high efficiency, and is automatically realized through the transient wave recording fault indicator and the master station system in the whole process without human intervention.
Description
Technical Field
The invention belongs to the technical field of power distribution network power supply line fault detection, and particularly relates to a method for self-identifying a phase sequence of a transient recording fault indicator.
Background
The determination of the low-current single-phase earth fault is called one of the worldwide problems due to its unique characteristics. Transient recording fault indicators have been widely used in 10KV power distribution systems because they can actively and automatically identify faults such as short circuit, low current single-phase grounding, etc. The fault positioning system consists of 3 transient wave recording fault indicators, a bus zero-sequence voltage starting device and a distribution automation main station, wherein the transient wave recording fault indicators are respectively installed on A, B, C three phases of an electric power circuit. Under normal conditions, 3 transient state record ripples fault indicator receive GPS signal synchronization and circulation start current electric field record ripples. When a fault occurs, the bus zero sequence voltage starting device accurately records zero sequence voltage mutation time, the master station positioning system is informed through GPRS, and then the master station system acquires local wave recording data through GPRS according to the zero sequence voltage mutation time, so that the positioning of the small-current single-phase grounding position is completed.
At present, the phase of the acquisition unit, such as ABC, is marked by label paper before the acquisition unit is hung on the site, but the corresponding line, particularly the AC phase line, is difficult to accurately identify when the acquisition unit arrives at the site. In addition, the current directions of all the hanging indicators under the same bus need to be consistent with the current direction of a current line, but the current directions are difficult to ensure to be consistent with the complexity of the line, and particularly the current directions cannot be confirmed at the rear end of a long line. Such phase hang-up and current direction misalignment can lead to changes of the synthesized zero sequence current, and finally to fault location errors.
Therefore, there is a need in the art for a transient recording fault indicator installation phase sequence self-identification method.
Disclosure of Invention
The invention aims to provide a method for self-identifying the installation phase sequence of a transient wave recording fault indicator, which aims to solve the problems that the transient wave recording fault indicator provided in the background technology is difficult to accurately identify a corresponding line when being installed on site, and the current directions of all hanging indicators under the same bus are difficult to be ensured to be consistent with the current direction of a current line along with the complexity of the line.
The invention discloses a method for self-identifying the installation phase sequence of a transient recording fault indicator, which comprises the following steps:
step S1, periodically reading time service by the transient state wave recording fault indicators and the bus zero sequence voltage starting device under the same bus, and synchronizing system time and sampling point positions by all the transient state wave recording fault indicators;
step S2, the transient wave recording fault indicator circularly stores the current and electric field data of each phase;
step S3, starting a trigger wave recording by a bus zero sequence voltage starting device, and acquiring current and electric field data by all transient wave recording fault indicators under the same bus;
step S4, calculating respective current initial phases by the transient wave recording fault indicator;
step S5, taking the initial phase of the ABC three-phase transient wave recording indicator current at the lower outlet of the bus as a reference, and respectively comparing the phase differences of the currents of all other indicators;
step S6, determining the phase and current direction coefficient of the transient wave recording indicator according to the phase difference, and writing the phase and current direction coefficient into respective memories;
step S7, if step S6 determines that the determination is failed, step S3 to step S6 are periodically executed in a loop until the phase recognition and the current direction coefficient determination are successful.
Further, the time service in step S1 is GPS time service.
Further, in step S3, the current and electric field data obtained by all transient recording fault indicators under the same bus are synchronous data.
Further, the transient recording fault indicators in step S4 calculate respective initial phases of the currents, and calculate the initial phases by using a discrete fourier algorithm.
Further, in step S6, the phase and the current direction coefficient of the transient recording indicator are determined according to the phase difference, specifically, the following rules are adopted for determination:
r1, if the initial phase of the phase current is the same as the initial phase of the A current at the outlet under the bus, the phase A is judged, and the current coefficient is 1; if the phase current initial phase is 180 degrees different from the phase A of the current at the lower outlet of the bus, the phase A of the phase is judged, and the current coefficient is-1;
r2, if the initial phase of the phase current is the same as the initial phase of the B current at the outlet under the bus, judging the phase B, and the current coefficient is 1; if the phase difference between the phase current initial phase and the B current initial phase of the lower outlet of the bus is 180 degrees, the phase B of the phase is judged, and the current coefficient is-1;
r3, if the initial phase of the phase current is the same as the initial phase of the C current at the lower outlet of the bus, judging the phase C, and the current coefficient is 1; and if the phase current initial phase is 180 degrees different from the C current initial phase at the lower outlet of the bus, judging the phase C, and the current coefficient is-1.
The beneficial effects of the invention include:
the method for identifying the installation phase sequence of the transient wave recording fault indicators provided by the invention obtains the self phase and current direction coefficients by comparing the current data synchronously sampled by each transient wave recording fault indicator with the ABC initial phase at the bus outlet. Therefore, the method is simple to implement and high in efficiency, is automatically implemented in the whole process through the transient wave recording fault indicator and the main station system, does not need human intervention, makes up errors possibly caused by human operation, and provides reliable data guarantee for positioning the low-current grounding fault.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
Fig. 1 shows a flow chart of the method of the present invention. The invention provides a self-recognition method for the installation phase sequence of a transient recording fault indicator, which comprises the following steps:
and step S1, periodically reading GPS time service by the transient wave recording fault indicators and the bus zero-sequence voltage starting device under the same bus, wherein the time service precision is 1uS, and all the transient wave recording fault indicators realize the synchronization of system time and sampling point positions, including the synchronous acquisition of current and electric fields. The current synchronization precision of each indicator is affected by the time service period and the RTC time keeping precision, and the synchronization precision is generally within 1.8 degrees.
And step S2, the transient wave recording fault indicator circularly stores the current and electric field data of each phase. Wherein the current and the electric field are synchronously collected. The period of acquisition is adjustable and can be 250 uS. The whole stored data length is influenced by communication time, namely after the voltage starting device triggers recording, each recording indicator can obtain the recording data at the corresponding moment without being cyclically covered, and generally can store the sampling data for more than 5 min.
And step S3, automatically starting triggering wave recording by a bus zero sequence voltage starting device, and acquiring current and electric field data by all transient wave recording fault indicators under the same bus. The bus zero sequence voltage starting device automatically starts, triggers and records waves and can inform a main station through GPRS, then the main station informs all indicators through GPRS to synchronously acquire current and power plant data, and data with more than 2 cycles can be acquired.
And step S4, calculating respective current initial phases by the transient recording fault indicator, and obtaining the current initial phases by adopting discrete Fourier algorithm calculation.
For the transient recording fault indicator, once the hardware is determined, the electric field phase of the hardware is not influenced by the hanging direction of the CT opening, but the current phase of the hardware is opposite to 180 degrees along with the different hanging directions of the CT opening. The initial phase of the current is also opposite to 180 degrees along with the different hanging directions of the CT openings.
And step S5, comparing the phase differences of all the current of the ABC three-phase transient wave recording indicator at the lower outlet of the bus by taking the initial phase of the current of the ABC three-phase transient wave recording indicator as a reference.
In general, the ABC three-phase transient recording indicator at the bus outlet has clear phase and current flow direction, so that the ABC three-phase transient recording indicator is used as a reference for reference, and is simple and reliable. For the same phase line, because all transient recording indicators record waves identically, the initial phases of the current of the lines are either consistent or differ by 180 degrees due to CT hanging. A deviation of 1.8 deg. is allowed for synchronization errors.
And step S6, according to the phase difference obtained in the step S5, the identification of the installation phase sequence of the transient recording fault indicator and the determination of the current direction coefficient are completed. Specifically, the following rules are adopted for judgment:
r1, if the initial phase of the phase current is the same as the initial phase of the A current at the outlet under the bus, the phase A is judged, and the current coefficient is 1; if the phase current initial phase is 180 degrees different from the phase A of the current at the lower outlet of the bus, the phase A of the phase is judged, and the current coefficient is-1; if the current phases are not met, continuously comparing the initial phase of the current B at the lower outlet of the bus;
r2, if the initial phase of the phase current is the same as the initial phase of the B current at the outlet under the bus, judging the phase B, and the current coefficient is 1; if the phase difference between the phase current initial phase and the B current initial phase of the lower outlet of the bus is 180 degrees, the phase B of the phase is judged, and the current coefficient is-1; if the current phases are not met, continuously comparing the initial phase of the C current at the lower outlet of the bus;
r3, if the initial phase of the phase current is the same as the initial phase of the C current at the lower outlet of the bus, judging the phase C, and the current coefficient is 1; and if the phase current initial phase is 180 degrees different from the C current initial phase at the lower outlet of the bus, judging the phase C, and the current coefficient is-1. And if the phase identification is not satisfied, informing the master station that the phase identification fails.
And if the phase identification and the current direction coefficient are successfully determined, writing the current direction coefficient into a memory and informing the main station that the self-identification of the installed phase sequence is successful.
Step S7, if step S6 determines that the determination is failed, step S3 to step S6 are periodically executed in a loop until the phase recognition and the current direction coefficient determination are successful. The period in which steps S3 through S6 are cyclically performed may be greater than 10 min.
The self-identification method for the installation phase sequence of the transient recording fault indicator can be used for any other electronic equipment needing phase sequence identification, and comprises various metering instruments (such as an electric energy meter, a water meter, a gas meter, a heat meter and the like), an electric energy management terminal, a power distribution terminal, electric energy quality monitoring equipment, a power grid automation terminal, a collection terminal, a concentrator, a data acquisition unit, a metering instrument, a hand-copying device and the like.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions and substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (5)
1. A transient recording fault indicator installation phase sequence self-recognition method is characterized by comprising the following steps:
step S1, periodically reading time service by the transient state wave recording fault indicators and the bus zero sequence voltage starting device under the same bus, and synchronizing system time and sampling point positions by all the transient state wave recording fault indicators;
step S2, the transient wave recording fault indicator circularly stores the current and electric field data of each phase;
step S3, starting a trigger wave recording by a bus zero sequence voltage starting device, and acquiring current and electric field data by all transient wave recording fault indicators under the same bus;
step S4, calculating respective current initial phases by the transient wave recording fault indicator;
step S5, taking the initial phase of the ABC three-phase transient wave recording indicator current at the lower outlet of the bus as a reference, and respectively comparing the phase differences of the currents of all other indicators;
step S6, determining the phase and current direction coefficient of the transient wave recording indicator according to the phase difference, and writing the phase and current direction coefficient into respective memories;
step S7, if step S6 determines that the determination is failed, step S3 to step S6 are periodically executed in a loop until the phase recognition and the current direction coefficient determination are successful.
2. The method according to claim 1, wherein the time service of step S1 is a GPS time service.
3. The method of claim 1, wherein all transient recording fault indicators in the same bus of step S3 acquire current and electric field data, which are synchronous data.
4. The method according to claim 1, wherein the transient recording fault indicators of step S4 calculate the initial phase of each current by using a discrete fourier algorithm.
5. The method according to claim 1, wherein the step S6 of determining the phase and current direction coefficients of the transient recording indicator according to the phase difference is performed by using the following rules:
r1, if the initial phase of the phase current is the same as the initial phase of the A current at the outlet under the bus, the phase A is judged, and the current coefficient is 1; if the phase current initial phase is 180 degrees different from the phase A of the current at the lower outlet of the bus, the phase A of the phase is judged, and the current coefficient is-1;
r2, if the initial phase of the phase current is the same as the initial phase of the B current at the outlet under the bus, judging the phase B, and the current coefficient is 1; if the phase difference between the phase current initial phase and the B current initial phase of the lower outlet of the bus is 180 degrees, the phase B of the phase is judged, and the current coefficient is-1;
r3, if the initial phase of the phase current is the same as the initial phase of the C current at the lower outlet of the bus, judging the phase C, and the current coefficient is 1; and if the phase current initial phase is 180 degrees different from the C current initial phase at the lower outlet of the bus, judging the phase C, and the current coefficient is-1.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112098738A (en) * | 2020-09-08 | 2020-12-18 | 青岛鼎信通讯股份有限公司 | Phase sequence self-adaption method based on transient recording type fault indicator |
| CN114594669A (en) * | 2020-12-04 | 2022-06-07 | 青岛鼎信通讯股份有限公司 | Accurate synchronization method of transient recording type fault indicator |
| CN114594342A (en) * | 2022-03-21 | 2022-06-07 | 国网安徽省电力有限公司电力科学研究院 | Power distribution network ground fault judgment input waveform consistency processing method |
| CN115589071A (en) * | 2022-11-24 | 2023-01-10 | 青岛鼎信通讯股份有限公司 | Fault indicator and power distribution network line fault determination method |
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| CN114594342A (en) * | 2022-03-21 | 2022-06-07 | 国网安徽省电力有限公司电力科学研究院 | Power distribution network ground fault judgment input waveform consistency processing method |
| CN115589071A (en) * | 2022-11-24 | 2023-01-10 | 青岛鼎信通讯股份有限公司 | Fault indicator and power distribution network line fault determination method |
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Application publication date: 20200515 |