CN110988515A - Voltage channel sampling abnormity detection method of transformer substation relay protection device - Google Patents
Voltage channel sampling abnormity detection method of transformer substation relay protection device Download PDFInfo
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Abstract
The invention discloses a method for detecting voltage channel sampling abnormity of a transformer substation relay protection device, which comprises the steps of S1-S8, the method is used for detecting the relay protection device in a transformer substation, and whether the voltage acquired by a feeder line device is normal or not is detected by comparing the voltage acquired by the feeder line device with the voltage acquired by a PT (potential transformer) measurement and control device, so that whether the feeder line device works normally or not is judged; in addition, the process of detecting whether the voltage collected by the PT measurement and control device is normal is arranged, so that the detection accuracy is improved; this scheme is all compared according to the line voltage, has compromise two kinds of typical wiring modes of PT star type wiring and triangle-shaped wiring.
Description
Technical Field
The invention relates to the technical field of transformer substation relay protection, in particular to a voltage channel sampling abnormity detection method of a transformer substation relay protection device.
Background
After the relay protection device of the transformer substation runs for a long time, the sampling loop may be abnormal. Particularly, the acquisition of a voltage channel is directly related to the operation condition of the spare power automatic switching device and the operation of the composite voltage blocking current protection logic. The voltage sampling loop generally comprises: the sampling data is abnormal due to the abnormity of any device, and the sampling data is characterized in that:
(1) if all the sampled original data are 0 or very small, the voltage vector calculation is too small, or 0 or zero drift is caused;
(2) sampling original data is directly full of codes or large, and the voltage vector obtained by calculation is overlarge;
(3) the sampling original data is high and low, so that the real analog quantity cannot be correctly reflected, and the calculation result is continuously and rapidly mutated.
The above situation mainly presents the following features:
1. when the external condition is normal and the voltage vector is judged as voltage loss by mistake, the spare power automatic switching device is caused to malfunction, and further the load shedding action is caused to cause large-area power failure; or the PT broken line is judged by mistake, direction locking or composite voltage protection quitting is triggered, overcurrent protection misoperation is further triggered, and unexpected power failure is caused.
2. If the external actual fault is under voltage loss but the device cannot detect the external actual fault, the backup power automatic switching device fails to operate, and large-area power failure is further caused.
3. The protection device can not normally reflect the actual load condition, so that the protection device frequently generates protection starting and protection returning, and operation and maintenance personnel are panic. When the duration of the abnormal data is greater than a fixed value, more serious malfunction may be caused.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the voltage channel sampling abnormity detection method of the substation relay protection device, which is accurate in detection.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
the method for detecting the sampling abnormity of the voltage channel of the relay protection device of the transformer substation comprises the following steps:
s1: collecting a measurement voltage U1 of a feeder device and a voltage U3 of a PT measurement and control device;
s2: if the measured voltage U1 is less than 12V, judging that the feeder line device is overhauled, and stopping voltage abnormity detection;
s3: if the measurement voltage U1 is more than or equal to 12V, calculating the maximum error delta U1 of the measurement voltage U1 and the set voltage reference value U2 to be | U1-U2|, the maximum error delta U2 of the measurement voltage U1 and the voltage U3 to be | U1-U3|, and the maximum error delta U3 of the voltage reference value U2 and the voltage U3 to be | U2-U3 |;
s4: comparing Δ U3 with a set voltage error threshold Uset 3;
s5: if the delta U3 is less than Uset3, the voltage U3 measured by the PT measurement and control device is a normal value, and then whether the delta U2 is larger than a set voltage error threshold value Uset2 is judged;
s6: if the delta U2 is larger than the Uset2, the voltage sampling of the feeder device is abnormal, otherwise, the sampling is normal, and the voltage abnormal detection is terminated;
s7: if the delta U3 is not less than the Uset3, the voltage U3 measured by the PT measurement and control device is an abnormal value, and then whether the delta U1 is larger than a set voltage error threshold value Uset1 is judged;
s8: and if the delta U1 is larger than the Uset1, the voltage sampling of the feeder device is abnormal, otherwise, the sampling is normal, and the voltage abnormal sampling detection is terminated.
Further, the method also comprises the following steps:
s9: marking the feeder line device which judges the voltage sampling is abnormal as abnormal sampling for 1 time;
s10: after delaying for a set time, repeating the steps S1-S8, and marking the feeder device for judging voltage abnormal sampling as abnormal sampling for 1 time;
s11: repeating the step S10, screening the feeder device marked with abnormal sampling times more than or equal to two times, and judging the feeder device marked with abnormal sampling times as the feeder device with abnormal sampling;
s13: and recording and storing the address information of the feeder device with abnormal detection data and sampling in the detection process, and sending the address information to the telecontrol workstation.
Further, the delay time is set to 90 seconds.
Further, the detection data and the address information in step S13 are saved by generating a file format and transmitted to the telemechanical workstation.
Furthermore, the PT measurement and control device and the feeder device collect three line voltages of the same section of bus.
A computer readable storage medium stores a computer program, and when the computer program is executed, the steps of the voltage channel sampling abnormity detection method of the substation relay protection device are realized.
The invention has the beneficial effects that: the technical scheme is used for detecting the relay protection device in the transformer substation, and the voltage collected in the feeder device is compared with the voltage collected in the PT measurement and control device to detect whether the voltage collected by the feeder device is normal or not, so that whether the feeder device works normally or not is judged; and be provided with the process that whether normal of PT measurement and control device collection voltage has increased the accuracy that detects in this scheme.
The scheme realizes automatic inspection of the voltage sampling channel of the relay protection device on the premise of not replacing or modifying the relay protection device, thereby automatically pre-warning, timely informing maintainers of carrying out targeted investigation on abnormal feeder devices and preventing accidents in the bud. By setting three rounds of voltage acquisition abnormity detection, the feeder line device which is identified as abnormal sampling only by marking abnormal sampling for more than two times greatly reduces the possibility of misjudgment; this scheme is all compared according to the line voltage, has compromise two kinds of typical wiring modes of PT star type wiring and triangle-shaped wiring.
Drawings
Fig. 1 is a flowchart of a voltage channel sampling abnormality detection method for a substation relay protection device.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1, the method for detecting sampling abnormality of the voltage channel of the substation relay protection device is characterized by comprising the following steps:
s1: collecting a measured voltage U1 of a feeder device and a voltage U3 measured by a PT measurement and control device;
s2: if the measured voltage U1 is less than 12V, judging that the feeder line device is overhauled, and stopping voltage abnormity detection;
s3: if the measurement voltage U1 is more than or equal to 12V, calculating the maximum error delta U1 of the measurement voltage U1 and the set voltage reference value U2 to be | U1-U2|, the maximum error delta U2 of the measurement voltage U1 and the voltage U3 to be | U1-U3|, and the maximum error delta U3 of the voltage reference value U2 and the voltage U3 to be | U2-U3 |;
s4: comparing Δ U3 to a voltage error threshold Uset 3;
s5: if the delta U3 is less than Uset, the voltage U3 measured by the PT measurement and control device is a normal value, the PT measurement and control device can work normally, and then whether the delta U2 is larger than a set voltage error threshold value Uset2 is judged;
s6: if the delta U2 is larger than the Uset2, the voltage sampling of the feeder device is abnormal; otherwise, the sampling is normal, and the voltage abnormity detection is stopped;
s7: if the delta U3 is not less than Uset, the voltage U3 measured by the PT measurement and control device is an abnormal value, and the voltage measured by the PT measurement and control device is an abnormal voltage; whether Δ U1 is then greater than a set voltage error threshold Uset 1;
s8: and if the delta U1 is larger than the Uset1, judging that the voltage sampling of the feeder device is abnormal, otherwise, judging that the sampling is normal, and stopping the voltage abnormal detection.
The scheme also comprises the following steps:
s10: marking the feeder line device which judges the voltage sampling is abnormal as abnormal sampling for 1 time;
s11: after delaying for a set time, preferably delaying for 90 seconds, repeating the steps S1-S9, and marking the feeder device for judging the voltage sampling abnormity as abnormal sampling for 1 time;
s12: repeating the step S11, screening the feeder device which marks the abnormal sampling times and is more than or equal to two times, and judging as the feeder device with abnormal sampling;
s13: and recording and storing address information of feeder devices with abnormal detection data and sampling in the detection process, sending the address information to the telecontrol workstation, and storing the detection data (U1, U3, delta U1, delta U2, delta U3, comparison results and the like) and the address information by generating a file format and sending the file format to the telecontrol workstation. And the remote power dispatching center acquires information through the telecontrol workstation and dispatches a specially-assigned person to the site for overhauling.
In the scheme, the PT measurement and control device and the feeder device collect three line voltages of the same bus.
The scheme further comprises a computer readable storage medium, wherein a computer program is stored in the computer readable storage medium, the steps of the voltage channel sampling abnormity detection method of the substation relay protection device are realized when the computer program is executed, and the computer program is built on the local monitoring background.
The technical scheme is used for detecting the relay protection device in the transformer substation, and the voltage collected in the feeder device is compared with the voltage collected in the PT measurement and control device to detect whether the voltage collected by the feeder device is normal or not, so that whether the feeder device works normally or not is judged; and be provided with the process that whether normal of PT measurement and control device collection voltage has increased the accuracy that detects in this scheme.
The scheme realizes automatic inspection of the voltage sampling channel of the relay protection device on the premise of not changing or modifying the relay protection device, thereby realizing automatic early warning, sending the judged result to the telemechanical workstation, conveniently and timely informing the maintainer to carry out targeted investigation on the abnormal feeder device, and preventing accidents in the bud. By setting three rounds of voltage acquisition abnormity detection, the feeder line device which is identified as abnormal sampling only by marking abnormal sampling for more than two times greatly reduces the possibility of misjudgment; this scheme is all compared according to the line voltage, has compromise two kinds of typical wiring modes of PT star type wiring and triangle-shaped wiring.
Claims (6)
1. A voltage channel sampling abnormity detection method of a transformer substation relay protection device is characterized by comprising the following steps:
s1: collecting a measurement voltage U1 of a feeder device and a voltage U3 of a PT measurement and control device;
s2: if the measured voltage U1 is less than 12V, judging that the feeder line device is overhauled, and stopping voltage abnormity detection;
s3: if the measurement voltage U1 is more than or equal to 12V, calculating the maximum error delta U1 of the measurement voltage U1 and the set voltage reference value U2 to be | U1-U2|, the maximum error delta U2 of the measurement voltage U1 and the voltage U3 to be | U1-U3|, and the maximum error delta U3 of the voltage reference value U2 and the voltage U3 to be | U2-U3 |;
s4: comparing Δ U3 with a set voltage error threshold Uset 3;
s5: if the delta U3 is less than Uset3, the voltage U3 measured by the PT measurement and control device is a normal value, and then whether the delta U2 is larger than a set voltage error threshold value Uset2 is judged;
s6: if the delta U2 is larger than the Uset2, the voltage sampling of the feeder device is abnormal, otherwise, the sampling is normal, and the voltage abnormal detection is terminated;
s7: if the delta U3 is not less than the Uset3, the voltage U3 measured by the PT measurement and control device is an abnormal value, and then whether the delta U1 is larger than a set voltage error threshold value Uset1 is judged;
s8: and if the delta U1 is larger than the Uset1, the voltage sampling of the feeder device is abnormal, otherwise, the sampling is normal, and the voltage abnormal sampling detection is terminated.
2. The method for detecting the voltage channel sampling abnormality of the substation relay protection device according to claim 1, further comprising the steps of:
s9: marking the feeder line device which judges the voltage sampling is abnormal as abnormal sampling for 1 time;
s10: after delaying for a set time, repeating the steps S1-S8, and marking the feeder device for judging voltage abnormal sampling as abnormal sampling for 1 time;
s11: repeating the step S10, screening the feeder device marked with abnormal sampling times more than or equal to two times, and judging the feeder device marked with abnormal sampling times as the feeder device with abnormal sampling;
s13: and recording and storing the address information of the feeder device with abnormal detection data and sampling in the detection process, and sending the address information to the telecontrol workstation.
3. The method for detecting the sampling abnormality of the voltage channel of the substation relay protection device according to claim 2, wherein the time set by the time delay is 90 seconds.
4. The method for detecting the voltage channel sampling abnormality of the substation relay protection device according to claim 2, wherein the detection data and the address information in step S13 are stored in a generated file format and transmitted to a telemechanical workstation.
5. The method for detecting the sampling abnormality of the voltage channel of the substation relay protection device according to claim 1, wherein the PT measurement and control device and the feeder device both collect three line voltages of the same bus.
6. A computer readable storage medium storing a computer program, wherein the computer program is executed to implement the steps of the voltage channel sampling abnormality detection method for a substation relay protection device according to any one of claims 1 to 5.
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| CN112362955A (en) * | 2020-10-22 | 2021-02-12 | 深圳力维智联技术有限公司 | ADC (analog to digital converter) acquisition method, device and equipment based on self calibration and storage medium |
| CN113281660A (en) * | 2021-05-21 | 2021-08-20 | 张家港清研检测技术有限公司 | Method for detecting unqualified battery cell in retired power battery pack |
| CN113640710A (en) * | 2021-08-13 | 2021-11-12 | 深圳市新威尔电子有限公司 | Channel crossing automatic detection method |
| CN113933563A (en) * | 2021-09-29 | 2022-01-14 | 国电南瑞科技股份有限公司 | Sampling abnormal large value filtering method, device and system based on adaptive iterative operation mathematical morphology method |
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