CN112130091A - Multi-source data-based single-phase grounding on-line monitoring method for ungrounded system of transformer substation - Google Patents
Multi-source data-based single-phase grounding on-line monitoring method for ungrounded system of transformer substation Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 77
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- 238000005259 measurement Methods 0.000 claims description 4
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
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Abstract
The invention discloses a multi-source data-based single-phase grounding online monitoring method for a non-grounded system of a transformer substation, which comprises the following steps of: s1, data collection and processing, S2, zero sequence voltage out-of-limit, S3, analog quantity channel fixed value setting, S4, fault recorder starting, S5, AND gate logic judgment, S6, and triggering non-ground system grounding alarm, the invention mainly calculates Ua, Ub and Uc through a computer monitoring system and a fault recorder, calculates the zero sequence voltage U0 by using an algorithm, when the calculated U0 from two different sources is larger than the set fixed value, the recorder is started, and simultaneously triggers a recorder starting signal to a computer monitoring background, the computer monitoring system reports the zero sequence voltage out-of-limit signal, and the computer monitoring system receives the recorder starting remote signaling signal and the zero sequence voltage out-of-limit signal to carry out AND gate logic to remind operation and maintenance personnel to process in time.
Description
Technical Field
The invention belongs to the technical field of electric power online detection, and particularly relates to a multi-source data-based single-phase grounding online monitoring method for a non-grounding system of a transformer substation.
Background
At present, in a transformer substation, remote signaling, remote measurement and remote control of 35kV voltage level are connected into a computer monitoring system, but the acquired data are not processed, so that the existing resources are not fully utilized, the 35kV voltage level in the transformer substation is an ungrounded system, and a relay protection device comprises an acquisition module, a judgment module and a memory. The method comprises the steps that a collection module is used for collecting three-phase voltage, zero-sequence voltage and zero-sequence current of a line, a judgment module is used for comparing whether the zero-sequence voltage is larger than a zero-sequence voltage starting threshold value or not, and if the zero-sequence voltage is larger than the zero-sequence voltage starting threshold value, a single-phase earth fault of a system is judged; when the single-phase grounding is not generated in the system, the 35kV protection does not act due to small grounding current.
In addition, in the prior art, the computer monitoring system in the transformer substation fails to send out audible and visual alarms to the type of grounding, so that the computer monitoring system is easy to be ignored by operating personnel, a single-phase grounding fault is developed into a two-phase fault, and finally a 35kV circuit breaker is exploded, so that the safety of personnel, a power grid and equipment is seriously affected;
therefore, the multi-source data-based single-phase grounding online monitoring method for the ungrounded system of the transformer substation is provided to solve the problems in the prior art, and the potential safety hazard caused by the fact that a single-phase grounding fault is developed into a two-phase fault is reduced to a certain extent.
Disclosure of Invention
The invention aims to provide a multi-source data-based single-phase grounding online monitoring method for a substation ungrounded system, and aims to solve the problems that in the prior art, a computer monitoring system in a substation fails to give an audible and visual alarm to the type of grounding, so that the computer monitoring system is easily ignored by operating personnel, a single-phase grounding fault is developed into a two-phase fault, and finally a 35kV circuit breaker explodes, so that personal safety, power grid safety and equipment safety are seriously affected.
In order to achieve the purpose, the invention adopts the following technical scheme:
the method for monitoring the single-phase grounding of the ungrounded system of the transformer substation on line based on multi-source data comprises the following steps:
s1, acquiring and processing data, acquiring and transmitting the data to a computer monitoring system for processing by using a measurement and control device in real time, calculating Ua, Ub and Uc by using the computer monitoring system, and calculating a zero-sequence voltage U0 by using an algorithm;
s2, setting a threshold for the calculated zero sequence voltage U0 when the zero sequence voltage is out of limit, reporting that the zero sequence voltage is out of limit when the zero sequence voltage is larger than a threshold fixed value, and triggering a signal to a computer monitoring background;
s3, setting a fixed value of an analog quantity channel, adding a new analog quantity channel in a fault recorder, setting the personalized fixed value of the analog quantity channel, calculating Ua, Ub and Uc through the fault recorder, and calculating a zero-sequence voltage U0 by using an algorithm;
s4, starting a fault wave recorder, starting the wave recorder when the calculated zero sequence voltage U0 is larger than the setting fixed value, and simultaneously triggering a signal to a computer monitoring background;
s5, performing AND gate logic judgment, wherein the computer monitoring system receives the recorder starting remote signaling signal and the zero sequence voltage out-of-limit remote signaling signal, performs AND gate logic on two signals triggered by different sources, and judges the logic;
and S6, triggering an ungrounded system grounding alarm, triggering a computer monitoring system to alarm when the logic of the AND gate is 1 according to the judgment logic result, and alarming and warning by the computer monitoring system.
Preferably, the calculation formula of the zero-sequence voltage U0 in step 1 is 3U0 ═ UA + UB + UC, if the power system is normal, the three phases are symmetrical, the values of the zero-sequence components are all zero, if the system fails, the three phases become asymmetrical, at this time, the zero-sequence component with amplitude is resolved, and whether the system fails is determined by detecting the two components that should not normally occur.
Preferably, when the value of the zero-sequence voltage U0 calculated by the computer monitoring system in step 2 is less than or equal to the set value, the zero-sequence voltage out-of-limit is not triggered to be reported, and the computer monitoring background cannot receive the trigger signal of the zero-sequence voltage out-of-limit.
Preferably, the zero sequence out-of-limit and the zero sequence mutation in the selected value are fixed during the setting of the personalized fixed value in step 3, and the fixed value is consistent with the threshold setting of the zero sequence voltage U0 of the computer monitoring system.
Preferably, the zero sequence voltage U0 in step 3 is calculated in the same manner as the zero sequence voltage U0 in step 1, and the assumption of the analog channel setting in step 3 is that a fault recorder is connected to the voltage class analog.
Preferably, when the value of the zero sequence voltage U0 calculated by the fault recorder in step 4 is less than or equal to the set value, the fault recorder is not triggered to start, and the computer monitoring background cannot receive the start signal of the fault recorder.
Preferably, the determining and gate logic in step 5 has the following two situations:
1) when the logic of the AND gate is 0, judging that the system is interfered, and not judging that an ungrounded system has a ground fault;
2) and when the logic of the AND gate is 1, judging that the ungrounded system has a ground fault.
Preferably, the computer monitoring system alarms in step 6 include an acousto-optic alarm and an optical character board alarm, wherein the acousto-optic alarm is used for giving an audible alarm to people, and the optical character board alarm is used for giving a visual alarm to people.
Preferably, step 1 and step 3 are performed simultaneously, and step 5 is directly performed after step 2 and step 4 are completed.
Compared with the prior art, the multisource data-based single-phase grounding on-line monitoring method for the ungrounded system of the transformer substation has the following advantages:
the invention mainly calculates Ua, Ub and Uc through a computer monitoring system and a fault recorder respectively, calculates zero sequence voltage U0 by using an algorithm, when the zero sequence voltage U0 calculated from two different sources is greater than the setting fixed value, the wave recorder is started, triggering the start signal of the wave recorder to the computer monitoring background, reporting the zero sequence voltage out-of-limit signal by the computer monitoring system, receiving the start remote signal of the wave recorder and the zero sequence voltage out-of-limit remote signal by the computer monitoring system to perform AND gate logic, when the logic of the AND gate is 1, the grounding of the ungrounded system is judged, the grounding of the ungrounded system is alarmed, operation and maintenance personnel are reminded to process in time, the potential safety hazard caused by the fact that the single-phase grounding fault of the ungrounded system cannot be processed in time and finally developed into a two-phase fault is reduced to a certain extent, and meanwhile, the situation that the judgment of the operation and maintenance personnel is influenced due to the fact that the single-source data is mistakenly alarmed is avoided.
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Fig. 1 is a flow chart of a single-phase grounding online monitoring method of a transformer substation ungrounded system based on multi-source data.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a multi-source data-based single-phase grounding online monitoring method for a non-grounding system of a transformer substation, which comprises the following steps of:
s1, acquiring and processing data, acquiring and transmitting the data to a computer monitoring system for processing by using a measurement and control device in real time, calculating Ua, Ub and Uc by using the computer monitoring system, and calculating a zero-sequence voltage U0 by using an algorithm;
s2, setting a threshold for the calculated zero sequence voltage U0 when the zero sequence voltage is out of limit, reporting that the zero sequence voltage is out of limit when the zero sequence voltage is larger than a threshold fixed value, and triggering a signal to a computer monitoring background;
s3, setting a fixed value of an analog quantity channel, adding a new analog quantity channel in a fault recorder, setting the personalized fixed value of the analog quantity channel, calculating Ua, Ub and Uc through the fault recorder, and calculating a zero-sequence voltage U0 by using an algorithm;
s4, starting a fault wave recorder, starting the wave recorder when the calculated zero sequence voltage U0 is larger than the setting fixed value, and simultaneously triggering a signal to a computer monitoring background;
s5, performing AND gate logic judgment, wherein the computer monitoring system receives the recorder starting remote signaling signal and the zero sequence voltage out-of-limit remote signaling signal, performs AND gate logic on two signals triggered by different sources, and judges the logic;
s6, triggering an ungrounded system grounding alarm, triggering a computer monitoring system to alarm when the logic of the AND gate is 1 according to the judgment logic result, and alarming and warning by the computer monitoring system;
the calculation formula of the zero-sequence voltage U0 in step 1 is 3U0 ═ UA + UB + UC, if the power system is normal, the three phases are symmetrical, the values of the zero-sequence components are all zero, if the system fails, the three phases become asymmetrical, at this time, the zero-sequence component with amplitude is resolved, and whether the system fails is determined by detecting the two components which should not normally occur;
when the value of the zero-sequence voltage U0 calculated by the computer monitoring system in the step 2 is less than or equal to the set value, the zero-sequence voltage out-of-limit is not triggered to be reported, and the computer monitoring background cannot receive the trigger signal of the zero-sequence voltage out-of-limit;
when the personalized fixed value is set in the step 3, zero-sequence out-of-limit and zero-sequence mutation in the selected value are checked for setting, and the setting is consistent with the threshold setting of the zero-sequence voltage U0 of the computer monitoring system;
the calculation mode of the zero-sequence voltage U0 in the step 3 is the same as that of the zero-sequence voltage U0 in the step 1, and the premise of setting the analog quantity channel in the step 3 is that a fault recorder is connected when the voltage class analog quantity is obtained;
when the value of the zero sequence voltage U0 calculated by the fault recorder in the step 4 is less than or equal to the set value, the fault recorder is not triggered to start, and the computer monitoring background cannot receive the starting signal of the fault recorder;
in step 5, the following two situations may exist in the and logic:
1) when the logic of the AND gate is 0, judging that the system is interfered, not judging that an ungrounded system has a ground fault, and not triggering a computer monitoring system to give an audible and visual alarm and an optical word board alarm;
2) when the logic of the AND gate is 1, judging that the ungrounded system has a ground fault, and triggering a computer monitoring system to give an audible and visual alarm and an optical word board alarm;
the computer monitoring system alarms in the step 6 comprise an acousto-optic alarm and an optical character board alarm, wherein the acousto-optic alarm is used for giving a warning for human hearing, and the optical character board alarm is used for giving a warning for human vision, so that personnel can handle the fault in time, and the probability of the fault developing from a single phase to a two-phase fault is reduced to a certain extent;
step 1 and step 3 are carried out synchronously, step 2 and step 4 are directly entered into step 5 after completion, so that the computer monitoring system and the fault recorder can simultaneously trigger zero sequence voltage out-of-limit and fault recorder starting, and the computer monitoring system can simultaneously receive recorder starting remote signaling signals and zero sequence voltage out-of-limit remote signaling signals to carry out AND gate logic calculation;
the working principle is as follows: the data collected by the measuring and controlling device and uploaded to the computer monitoring system are processed, Ua, Ub and Uc are calculated by the computer monitoring system, and the zero sequence voltage U0 is calculated by an algorithm. Setting a threshold for the calculated zero sequence voltage U0, and reporting the zero sequence voltage out-of-limit when the zero sequence voltage is greater than the fixed value; meanwhile, in the transformer substation, a new path of analog channel is added in a fault recorder, the analog channel is subjected to personalized setting, zero-sequence out-of-limit and zero-sequence sudden change in the set value are checked to carry out setting, the set value is consistent with the zero-sequence voltage U0 threshold of a computer monitoring system, Ua, Ub and Uc are calculated through the fault recorder, the zero-sequence voltage U0 is calculated by using an algorithm, when the calculated zero-sequence voltage U0 is greater than the set value, the recorder is started, simultaneously, a signal is triggered to a computer monitoring background, the computer monitoring system receives a recorder starting remote signaling signal and a zero-sequence voltage out-of-limit remote signaling signal, two signals triggered by different sources are subjected to AND gate logic, when the AND gate logic is 1, the ungrounded system is triggered to generate ground fault, and an acousto-optic alarm and an optic plate alarm can simultaneously give auditory and visual sense to people, the potential safety hazard caused by the fact that a single-phase earth fault is developed into a two-phase fault is reduced to a certain extent, and meanwhile, the situation that judgment of operation and maintenance personnel is influenced due to false alarm of single-source data is avoided.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (9)
1. A transformer substation ungrounded system single-phase grounding on-line monitoring method based on multi-source data is characterized in that: the method comprises the following steps:
s1, acquiring and processing data, acquiring and transmitting the data to a computer monitoring system for processing by using a measurement and control device in real time, calculating Ua, Ub and Uc by using the computer monitoring system, and calculating a zero-sequence voltage U0 by using an algorithm;
s2, setting a threshold for the calculated zero sequence voltage U0 when the zero sequence voltage is out of limit, reporting that the zero sequence voltage is out of limit when the zero sequence voltage is larger than a threshold fixed value, and triggering a signal to a computer monitoring background;
s3, setting a fixed value of an analog quantity channel, adding a new analog quantity channel in a fault recorder, setting the personalized fixed value of the analog quantity channel, calculating Ua, Ub and Uc through the fault recorder, and calculating a zero-sequence voltage U0 by using an algorithm;
s4, starting a fault wave recorder, starting the wave recorder when the calculated zero sequence voltage U0 is larger than the setting fixed value, and simultaneously triggering a signal to a computer monitoring background;
s5, performing AND gate logic judgment, wherein the computer monitoring system receives the recorder starting remote signaling signal and the zero sequence voltage out-of-limit remote signaling signal, performs AND gate logic on two signals triggered by different sources, and judges the logic;
and S6, triggering an ungrounded system grounding alarm, triggering a computer monitoring system to alarm when the logic of the AND gate is 1 according to the judgment logic result, and alarming and warning by the computer monitoring system.
2. The multi-source data-based single-phase grounding online monitoring method for the ungrounded substation system according to claim 1, characterized in that: the calculation formula of the zero-sequence voltage U0 in step 1 is 3U0 ═ UA + UB + UC, if the power system is normal, the three phases are symmetrical, the values of the zero-sequence components are all zero, if the system fails, the three phases become asymmetrical, at this time, the zero-sequence component with amplitude is resolved, and whether the system fails is determined by detecting the two components which should not normally occur.
3. The multi-source data-based single-phase grounding online monitoring method for the ungrounded substation system according to claim 1, characterized in that: when the value of the zero-sequence voltage U0 calculated by the computer monitoring system in the step 2 is less than or equal to the set value, the zero-sequence voltage out-of-limit is not triggered to be reported, and the computer monitoring background cannot receive the trigger signal of the zero-sequence voltage out-of-limit.
4. The multi-source data-based single-phase grounding online monitoring method for the ungrounded substation system according to claim 1, characterized in that: and 3, when the personalized fixed value is set, zero-sequence out-of-limit and zero-sequence mutation in the selected value are checked for setting, and the setting is consistent with the threshold setting of the zero-sequence voltage U0 of the computer monitoring system.
5. The multi-source data-based single-phase grounding online monitoring method for the ungrounded substation system according to claim 1, characterized in that: the calculation mode of the zero sequence voltage U0 in the step 3 is the same as that of the zero sequence voltage U0 in the step 1, and the premise of setting the analog quantity channel in the step 3 is that a fault recorder is connected when the voltage class analog quantity is used.
6. The multi-source data-based single-phase grounding online monitoring method for the ungrounded substation system according to claim 1, characterized in that: and 4, when the zero sequence voltage U0 value calculated by the fault recorder in the step 4 is less than or equal to the set value, the fault recorder cannot be triggered to start, and the computer monitoring background cannot receive the starting signal of the fault recorder.
7. The multi-source data-based single-phase grounding online monitoring method for the ungrounded substation system according to claim 1, characterized in that: in step 5, the and logic may have the following two situations:
1) when the logic of the AND gate is 0, judging that the system is interfered, and not judging that an ungrounded system has a ground fault;
2) and when the logic of the AND gate is 1, judging that the ungrounded system has a ground fault.
8. The multi-source data-based single-phase grounding online monitoring method for the ungrounded substation system according to claim 1, characterized in that: and 6, the computer monitoring system alarms comprise an acousto-optic alarm and an optical character board alarm, wherein the acousto-optic alarm is used for giving an auditory alarm to people, and the optical character board alarm is used for giving a visual alarm to people.
9. The multi-source data-based single-phase grounding online monitoring method for the ungrounded substation system according to claim 1, characterized in that: and step 1 and step 3 are synchronously performed, and step 5 is directly performed after step 2 and step 4 are finished.
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