CN109283406B - Current loop monitoring system based on total station data contrastive analysis - Google Patents
Current loop monitoring system based on total station data contrastive analysis Download PDFInfo
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Abstract
The invention discloses a current loop monitoring system for total station data contrastive analysis, which comprises a first class current sampling module, a second class current sampling module, a first class current sampling judgment module and a second class current sampling judgment module, wherein the first class current sampling module is used for acquiring single current data of a single interval of a transformer substation and transmitting the acquired current data to the first class current sampling judgment module; the second-class current sampling module is used for collecting more than two current data of a single interval of the transformer substation, transmitting the collected current data to the second-class current sampling judgment module, and judging whether the collected current data value is correct or not by the second-class current sampling judgment module. The system performs distinguishing comparison by utilizing the first-class relation and the second-class relation, avoids false alarm, improves the accuracy of alarm, and performs transverse and longitudinal comparison analysis by utilizing the current data of the whole station to find out fault points.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a current loop monitoring system based on total station data contrastive analysis.
Background
The existing secondary circuit monitoring method of the current transformer has basic monitoring of secondary equipment such as protection, measurement and control and the like, but the monitoring precision is low, and only the fault of the open circuit of the current circuit can be monitored. The TA disconnection locking method of the line protection such as the Nanrui relay protection comprises the following steps:
1. the self-produced zero-sequence current is less than 0.75 time of the external zero-sequence current, or the self-produced zero-sequence current is less than 0.75 time of the external zero-sequence current, and a TA (timing advance) line break abnormal signal is delayed for 200 ms;
2. if there is self-produced zero sequence current but no zero sequence voltage and there is no current in at least one phase, the TA broken line abnormal signal is generated after 10 seconds of delay.
3. At the moment of TA disconnection, the starting element and the differential relay on the disconnection side can act, but the starting element on the opposite side does not act, and a differential protection action signal cannot be sent to the side, so that the pilot differential cannot be operated mistakenly. The non-broken side reports 'long-term difference stream' after time delay, and the same treatment is carried out as TA broken line.
However, the above method has the following disadvantages:
1. the interference of the current loop can not be effectively monitored. For example, in 2004, a 500kV main transformer is in misoperation when a line is in fault, namely protection misoperation is caused by interference current entering a current loop. But the protection device cannot judge correctly.
2. The situation of shunting cannot be judged: if the short circuit of the operating personnel and the false touch of the CT secondary circuit occur for many times, the current of the secondary circuit is suddenly changed, and the protection misoperation is caused.
3. The condition of wrong wiring of the CT winding cannot be judged: for example, when a 500kV protection misuse measurement and control winding is in line fault, the CT winding is saturated, so that protection malfunction is caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a current loop monitoring system based on total station data comparative analysis so as to improve the monitoring accuracy.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the current loop monitoring system based on the total station data contrastive analysis comprises a first-class current sampling module, a second-class current sampling module, a first-class current sampling judgment module, a second-class current sampling judgment module and a current sampling centralized judgment device; wherein,
the class-I current sampling module is used for acquiring single current data of a single interval of the transformer substation and transmitting the acquired current data to the class-I current sampling judgment module, the class-I current sampling judgment module judges whether the acquired current data value is correct or not and transmits the wrong current data value to the current sampling centralized judgment device, and the current sampling centralized judgment device judges data at the fault moment;
the secondary current sampling module is used for collecting more than two current data of a single interval of the transformer substation and transmitting the collected current data to the secondary current sampling judgment module, the secondary current sampling judgment module judges whether the collected current data value is correct or not and transmits the wrong current data value to the current sampling centralized judgment device, and the current sampling centralized judgment device judges the data at the fault moment.
The data of the current sampling centralized judgment device at the fault moment are specifically as follows:
when the current centralized processing device receives the fault recording data, firstly, time synchronization searching is carried out, whether fault recording data of other equipment exist at the fault moment is searched, and if yes, data comparison logic is entered; and judging whether the current data has faults according to the data comparison result, and if the current data has the faults, alarming and outputting and comparing the results.
The first-class current sampling judgment module judges whether the current data value acquired by the first-class current sampling module is correct or not through kirchhoff's current law, and the specific judgment conditions are as follows:
current and relationship: the line current is the vector sum of the two switching currents; the current of the opposite side of the circuit is equal to the current of the opposite side; the currents on the high-voltage side and the low-voltage side of the reactor should be equal; the current of each side of the transformer is in direct proportion to the transformation ratio of the transformer: converting the current relationship between the high-voltage side and the low-voltage side of the transformer according to the transformation ratio of the high-voltage side and the low-voltage side, wherein the converted amplitudes are equal;
after the judgment of the judgment condition, if no data error exists, the amplitude data of the current is transmitted at each interval, and the amplitude of the current is output according to the data of the fixed time of the GPS time or the average value in a certain period of time or the maximum and minimum value in a certain period of time; if the data has errors, the related interval data is output in a full data mode.
The method for judging whether the current data value acquired by the class II power supply sampling device is correct by the class II current sampling judgment module comprises the following steps: comparing whether the data of more than two current data are the same or not, and if the data of more than two current data are the same, indicating that the data are correct;
or judging whether each current data value is correct according to the following judgment conditions:
current and relationship: the line current is the vector sum of the two switching currents; the current of the opposite side of the circuit is equal to the current of the opposite side; the currents on the high-voltage side and the low-voltage side of the reactor should be equal; the current of each side of the transformer is in direct proportion to the transformation ratio of the transformer: converting the current relationship between the high-voltage side and the low-voltage side of the transformer according to the transformation ratio of the high-voltage side and the low-voltage side, wherein the converted amplitudes are equal;
after the judgment of the judgment condition, if no data error exists, the amplitude data of the current is transmitted at each interval, and the amplitude of the current is output according to the data of the fixed time of the GPS time or the average value in a certain period of time or the maximum and minimum value in a certain period of time; if the data has errors, the related interval data is output in a full data mode.
The class-I current sampling module comprises a plurality of measurement and control devices, a plurality of wave recording devices and a plurality of PMU devices; a plurality of measurement and control devices are connected with a class of current sampling judgment module through a monitoring system switch, a plurality of wave recording devices are connected with a class of current sampling judgment module through a wave recording switch, and a plurality of PMU devices are connected with a class of current sampling judgment module through a PMU switch.
The second-class current sampling module comprises more than two sets of protection devices and a safety and stability device, and the more than two sets of protection devices and the safety and stability device are connected with the second-class sampling judgment module through a security and communication switch and a safety and stability switch respectively.
Compared with the prior art, the invention has the beneficial effects that:
the system performs distinguishing comparison by utilizing the first-class relation and the second-class relation, avoids false alarm, improves the accuracy of alarm, and performs transverse and longitudinal comparison analysis by utilizing the current data of the whole station to find out fault points.
Drawings
Fig. 1 is a schematic composition diagram of a current loop monitoring system based on total station data comparative analysis according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a total station line.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and detailed description.
Example (b):
referring to fig. 1, the current loop monitoring system based on total station data contrastive analysis provided in this embodiment includes a first-class current sampling module, a second-class current sampling module, a first-class current sampling judgment module, a second-class current sampling judgment module, and a current sampling centralized judgment device.
The class-I current sampling module is used for acquiring single current data of a single interval of a transformer substation and transmitting the acquired current data to the class-I current sampling judgment module, the class-I current sampling judgment module judges whether the acquired current data value is correct or not and transmits the wrong current data value to the current sampling centralized judgment device, and the current sampling centralized judgment device judges data of fault time;
the second-class current sampling module is used for collecting more than two current data of a single interval of the transformer substation and transmitting the collected current data to the second-class current sampling judgment module, the second-class current sampling judgment module judges whether the collected current data value is correct or not and transmits the wrong current data value to the current sampling centralized judgment device, and the current sampling centralized judgment device judges the data at the fault moment.
Therefore, the system carries out distinguishing comparison by utilizing the first-class relation and the second-class relation, avoids false alarm, improves the accuracy of alarm, and carries out transverse and longitudinal comparison analysis by utilizing the current data of the whole station to find out fault points.
Specifically, the data of the current sampling centralized judgment device at the time of judging the fault is specifically:
when the current centralized processing device receives the fault recording data, firstly, time synchronization searching is carried out, whether fault recording data of other equipment exist at the fault moment is searched, and if yes, data comparison logic is entered; and judging whether the current data has faults according to the data comparison result, and if the current data has the faults, alarming and outputting and comparing the results. Namely, the first-class relation and the second-class relation are utilized to carry out distinguishing comparison, so that false alarm is avoided, and the accuracy of alarm is improved.
The single interval data collected by the current sampling module generally only has a single set of devices, such as a measurement and control device, a (fault) wave recording device, a PMU device and the like, wherein the measurement and control device, the (fault) wave recording device and the PMU device are respectively provided with a plurality of sets which are respectively connected with the corresponding current sampling judgment module through a monitoring system switch, a wave recording switch and a PMU switch; the first-class current sampling judgment module judges whether the current data value acquired by the first-class current sampling module is correct or not through kirchhoff's current law, and the specific judgment conditions are as follows:
1. current and relationship: if the line current is the vector sum of two switch currents: the currents of a line primary, a line secondary, a line tertiary, an auxiliary A, an auxiliary B, a safety A, a safety B, a fault recording, a PMU, a metering and the like of the original line 1 are equal to the sum of the 5031 switching current and the 5032 switching current.
2. The current on the opposite side of the line is equal to the current on the current side (the influence of capacitance current and reactance current of the line should be subtracted).
3. The currents on the high and low sides of the reactor should be equal.
4. The current of each side of the transformer is in direct proportion to the transformation ratio of the transformer: the current relationship between the high-voltage side and the low-voltage side of the transformer is converted according to the transformation ratio, and the converted amplitudes are equal.
After the above judgment, if there is no data error, the amplitude data of the current is transmitted every interval according to the main wiring diagram. The amplitude of the current may be based on data of a fixed time of the GPS time, may output an average value in a certain period of time, or may output a maximum and minimum value in a certain period of time.
The device simultaneously transmits fault recording data at the fault moment to the current centralized processing device, so that the current centralized processing device judges the data at the fault moment.
If the data has errors, the related interval data is output in a full data mode. The next comparative analysis is convenient to enter.
The single interval data collected by the second-class current sampling judgment module generally has two or more sets of devices, such as a plurality of protection devices, a plurality of safety and stability devices and the like, correspondingly, the plurality of protection devices and the plurality of safety and stability devices are respectively connected with the corresponding second-class current sampling judgment module through a communication switch and a safety and stability switch, and the current data value collected by the second-class power supply sampling device can be directly judged whether the data is normal or not by comparing whether the two sets of data at the same interval are the same or not.
Meanwhile, whether each sampling data of the current is accurate or not can be judged according to the following relation.
1. Current and relationship: if the line current is the vector sum of two switch currents: as shown in fig. 2, the currents of the first line, the second line, the third line, the auxiliary line a, the auxiliary line B, the safety line a, the safety line B, the fault recording, the PMU, the metering and the like of the main line 1 should be equal to the sum of the 5031 switching current and the 5032 switching current.
2. The current on the opposite side of the line is equal to the current on the current side (the influence of capacitance current and reactance current of the line should be subtracted).
3. The currents on the high and low sides of the reactor should be equal.
4. The current of each side of the transformer is in direct proportion to the transformation ratio of the transformer: the current relationship between the high-voltage side and the low-voltage side of the transformer is converted according to the transformation ratio, and the converted amplitudes are equal.
After the above judgment, if there is no data error, the amplitude data of the current is transmitted every interval according to the main wiring diagram. The amplitude of the current may be based on data of a fixed time of the GPS time, may output an average value in a certain period of time, or may output a maximum and minimum value in a certain period of time.
If the data has errors, the related interval data is output in a full data mode. The next comparative analysis is convenient to enter.
The device simultaneously transmits fault recording data at the fault moment to the current centralized processing device, so that the current centralized processing device judges the data at the fault moment.
That is to say, the current sampling centralized judgment device is mainly used for comprehensively comparing, judging and analyzing the data of the first-class and second-class current sampling judgment modules. At the moment, each interval has corresponding data, so that the current amplitude of each interval is contrastively analyzed according to the model of the main wiring.
Specifically, the logic for judging the current data equality is as follows:
when the error is within the allowable range, the judgment is normal. When the error is out of the allowable range, it is judged to be abnormal.
ax＝|I1A|-|I2A|；bx＝|I1B|-|I2B|；cx＝|I1C|-|I2C|；ay＝∠I1A-I2A；by＝∠I1B-I2B；cy＝∠I1C-I2C；
And when the ax, the bx, the cx, the ay, the by and the cy are all smaller than the set values, judging the operation to be normal, otherwise, judging the operation to be abnormal. Wherein ax, bx, cx are amplitude errors, ay, by, cy are angle errors. When the amplitude of the alternating current is within the range of 0.05-20 In, the relative error is not more than 2.5% or the absolute error is not more than 0.01In, the alternating current is taken as an alarm 1; if the following table is exceeded (the setting may be made by referring to other specifications), the alarm 2 is set.
Therefore, the invention has the following characteristics:
1. and performing transverse and longitudinal comparison analysis by using the current data of the whole station to find out a fault point.
2. And the first-class relation and the second-class relation are utilized to carry out difference comparison, so that false alarm is avoided, and the accuracy of alarm is improved.
3. And carrying out omnibearing comparative analysis by using the amplitude and the angle of the current to find out a fault point.
4. And two-stage alarming is utilized to achieve early prevention and early alarming.
Therefore, compared with the prior art, the invention has the following technical advantages:
1. the monitoring sensitivity is high, and fine defects can be effectively overcome.
2. The problem of low insulation of the secondary circuit of the current transformer can be found. The prior art can not find the defects of the type.
3. The monitoring speed is high. The judgment speed is much higher than that of the existing device.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (4)
1. The current loop monitoring system based on the total station data contrastive analysis is characterized by comprising a first-class current sampling module, a second-class current sampling module, a first-class current sampling judgment module, a second-class current sampling judgment module and a current sampling centralized judgment device; wherein,
the class-I current sampling module is used for acquiring single current data of a single interval of the transformer substation and transmitting the acquired current data to the class-I current sampling judgment module, the class-I current sampling judgment module judges whether the acquired current data value is correct or not and transmits the wrong current data value to the current sampling centralized judgment device, and the current sampling centralized judgment device judges data at the fault moment;
the secondary current sampling module is used for acquiring more than two current data of a single interval of the transformer substation and transmitting the acquired current data to the secondary current sampling judgment module, the secondary current sampling judgment module judges whether the acquired current data value is correct or not and transmits the wrong current data value to the current sampling centralized judgment device, and the current sampling centralized judgment device judges the data of the fault moment;
the data of the current sampling centralized judgment device at the fault moment are specifically as follows:
when the current centralized processing device receives the fault recording data, firstly, time synchronization searching is carried out, whether fault recording data of other equipment exist at the fault moment is searched, and if yes, data comparison logic is entered; judging whether the current data has faults according to the data comparison result, if so, alarming and outputting the comparison result;
the first-class current sampling judgment module judges whether the current data value acquired by the first-class current sampling module is correct or not through kirchhoff's current law, and the specific judgment conditions are as follows:
current and relationship: the line current is the vector sum of the two switching currents; the current of the opposite side of the circuit is equal to the current of the opposite side; the currents on the high-voltage side and the low-voltage side of the reactor should be equal; the current of each side of the transformer is in direct proportion to the transformation ratio of the transformer: converting the current relationship between the high-voltage side and the low-voltage side of the transformer according to the transformation ratio of the high-voltage side and the low-voltage side, wherein the converted amplitudes are equal;
after the judgment of the judgment condition, if no data error exists, the amplitude data of the current is transmitted at each interval, and the amplitude of the current is output according to the data of the fixed time of the GPS time or the average value in a certain period of time or the maximum and minimum value in a certain period of time; if the data has errors, the related interval data is output in a full data mode.
2. The current loop monitoring system based on total station data contrastive analysis of claim 1, wherein the method for judging whether the current data value collected by the second type power supply sampling device is correct by the second type current sampling judgment module is as follows: comparing whether the more than two current data are the same or not, and if the more than two current data are the same, indicating that the current data are correct;
or judging whether each current data value is correct according to the following judgment conditions:
current and relationship: the line current is the vector sum of the two switching currents; the current of the opposite side of the circuit is equal to the current of the opposite side; the currents on the high-voltage side and the low-voltage side of the reactor should be equal; the current of each side of the transformer is in direct proportion to the transformation ratio of the transformer: converting the current relationship between the high-voltage side and the low-voltage side of the transformer according to the transformation ratio of the high-voltage side and the low-voltage side, wherein the converted amplitudes are equal;
after the judgment of the judgment condition, if no data error exists, the amplitude data of the current is transmitted at each interval, and the amplitude of the current is output according to the data of the fixed time of the GPS time or the average value in a certain period of time or the maximum and minimum value in a certain period of time; if the data has errors, the related interval data is output in a full data mode.
3. The total station data comparative analysis-based current loop monitoring system of claim 1, wherein said one type of current sampling module comprises a plurality of measurement and control devices, a plurality of wave recording devices, and a plurality of PMU devices; a plurality of measurement and control devices are connected with a class of current sampling judgment module through a monitoring system switch, a plurality of wave recording devices are connected with a class of current sampling judgment module through a wave recording switch, and a plurality of PMU devices are connected with a class of current sampling judgment module through a PMU switch.
4. The total-station data contrastive analysis-based current loop monitoring system according to claim 1 or 3, characterized in that the second-type current sampling module includes more than two sets of protection devices and safety devices, and the more than two sets of protection devices and safety devices are respectively connected with the second-type sampling judgment module through a communication switch and a safety switch.
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