CN109932676A - The method for detecting abnormality of voltage transformer circuit - Google Patents
The method for detecting abnormality of voltage transformer circuit Download PDFInfo
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Abstract
The invention discloses a kind of method for detecting abnormality of voltage transformer circuit, voltage transformer circuit includes the voltage transformer connecting with three phase transmission line, two the first converters connecting with voltage transformer, two the first analog-digital converters, CPU and alarm；Two the first converters are connected with the three of the secondary coil of two homotypes of voltage transformer respectively；Two the first converters are electrically connected with two the first analog-digital converters respectively, and CPU is electrically connected with two the first analog-digital converters and alarm respectively.The present invention has and can have no need to change relay protection action policy mechanism without locking, reliability of relay protection can be improved；Detection efficiency is high, the good feature of accuracy.
Description
Technical Field
The invention relates to the technical field of power system relay protection, in particular to a method for detecting abnormality of a voltage transformer loop, which has high detection efficiency and good accuracy.
Background
Whether an analog quantity sampling loop of a relay protection voltage transformer of the power system is normal or not is directly related to the protection reliability, and the detection function of the loop abnormality is an important guarantee for the correct action of the protection device.
The normally-operated relay protection device is provided with corresponding relay protection elements, analyzes the real-time state quantity of the power system when the power system operates, judges the operating state of the power system, and handles the abnormal working conditions of power system faults and safety operation endangering.
The judgment process for judging whether the loop is abnormal or not through the positive and negative sequence components of the electrical quantity sampling data and the corresponding logical relationship is relatively complex, and different logical judgment conditions are needed under specific conditions.
Disclosure of Invention
The invention aims to overcome the defects that the analog quantity sampling circuit of the relay protection voltage transformer in the prior art is complex in abnormal detection method and different logic judgment conditions are required under specific conditions, and provides the abnormal detection method of the voltage transformer circuit, which has high detection efficiency and good accuracy.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for detecting abnormality of a voltage transformer loop comprises the steps that the voltage transformer loop comprises a voltage transformer connected with a three-phase power transmission line, two first converters connected with the voltage transformer, two first analog-to-digital converters, a CPU and an alarm; the two first converters are respectively connected with three phases of two secondary coils of the same type of the voltage transformer; the two first converters are respectively and electrically connected with the two first analog-to-digital converters, and the CPU is respectively and electrically connected with the two first analog-to-digital converters and the alarm; the method comprises the following steps:
(1-1) two groups of three-phase voltages are led out from two homotypic secondary coils of the voltage transformer;
(1-2) the two groups of three-phase voltages are respectively connected with two converters, and the two converters respectively convert the two groups of three-phase voltages into a first group of weak voltage signals UA1、UB1、UC1And a second group of weak voltage signals UA2、UB2、UC2；
(1-3) performing analog-to-digital conversion on the first group of weak voltage signals and the second group of weak voltage signals by using the two analog-to-digital converters to obtain digital sampling data of the two groups of weak voltage signals;
and (1-4) comparing the digital sampling data of the two groups of weak voltage signals by the CPU to determine whether the voltage transformer loop is abnormal.
The traditional relay protection voltage transformer analog quantity sampling loop abnormity detection is complex in logic, judging conditions are related to equipment running states and are not obviously distinguished from fault quantities, a certain time delay is carried out in the judging process, and corresponding protection needs to be locked after the relay protection voltage transformer analog quantity sampling loop is judged to be abnormal.
The invention fully utilizes the voltage quantity led out by the multiple groups of secondary coils of the voltage transformer, analyzes the relation between the voltage quantities, and is used as a judgment method for judging whether the state of a voltage sampling loop is abnormal or not, and the invention is suitable for various equipment conditions by taking simple quantity value judgment as a basis.
According to the invention, by utilizing the configuration characteristics of the current main equipment voltage transformer, sampling data comparison is carried out between two groups of coils with the same type of the voltage transformer at the same installation point, when the deviation of the two groups of data does not exceed a threshold value, the loop is considered to be normal, otherwise, the loop is abnormal.
Preferably, (1-4) comprises the steps of:
using the following formula to pair UA1、UB1、UC1And UA2、UB2、UC2Comparing to obtainAnd
wherein,is UA1The vector of (a) is determined,is UA2The vector of (a) is determined,the a-phase vector difference of the two sets of weak voltage signals,is UB1The vector of (a) is determined,is UB2The vector of (a) is determined,is the B phase vector difference of two groups of weak voltage signals,is UC1The vector of (a) is determined,is UC2The vector of (a) is determined,c-phase vector difference, U, of two groups of weak voltage signalsNORMALAs a voltage transformerThe rated voltage of (d);
when MAX (| Δ U)A|，|ΔUB|，|ΔUC|)＞15％UNORMALAnd the CPU judges the abnormity of the voltage transformer loop and controls the alarm to give an alarm.
Preferably, the transformer further comprises a second converter and a second digital-to-analog converter, wherein the second converter is connected with three phases of another secondary coil of the same type of the voltage transformer, the second converter is electrically connected with the second digital-to-analog converter, and the second digital-to-analog converter is electrically connected with the CPU; the second digital-to-analog converter outputs auxiliary voltage sampling data UA3、UB3、UC3；
Using the step (1-4) to mix UA3、UB3、UC3Are respectively connected with UA1、UB1、UC1And UA2、UB2、UC2Comparing if the auxiliary voltage sample data with UA1、UB1、UC1When comparing, the circuit of the voltage transformer is judged to be abnormal, and the voltage quantity sampling data and the U are assisted at the same timeA2、UB2、UC2When the comparison is carried out, the voltage transformer loop is judged to be normal, and then the CPU enables the U to be connectedA1、UB1、UC1Abandon, add UA2、UB2、UC2As a normal amount of voltage.
Therefore, the invention has the following beneficial effects: locking can be omitted, a relay protection action strategy mechanism does not need to be changed, and relay protection reliability can be improved; the detection efficiency is high, and the accuracy is good.
Drawings
FIG. 1 is a functional block diagram of the present invention;
fig. 2 is a circuit diagram of the present invention.
In the figure: the device comprises a voltage transformer 1, a first converter 2, a first analog-to-digital converter 3, a CPU 4, an alarm 5, a second converter 6 and a second digital-to-analog converter 7.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
The embodiment shown in fig. 1 and 2 is an abnormality detection method for a voltage transformer loop, the voltage transformer loop comprises a voltage transformer 1 connected with a three-phase power transmission line, two first converters 2 connected with the voltage transformer, two first analog-to-digital converters 3, a CPU 4 and an alarm 5; the two first converters are respectively connected with three phases of two secondary coils of the same type of the voltage transformer; the two first converters are respectively and electrically connected with the two first analog-to-digital converters, and the CPU is respectively and electrically connected with the two first analog-to-digital converters and the alarm; the method comprises the following steps:
(1-1) two groups of three-phase voltages are led out from two homotypic secondary coils of the voltage transformer;
(1-2) the two groups of three-phase voltages are respectively connected with two converters, and the two converters respectively convert the two groups of three-phase voltages into a first group of weak voltage signals UA1、UB1、UC1And a second group of weak voltage signals UA2、UB2、UC2；
(1-3) performing analog-to-digital conversion on the first group of weak voltage signals and the second group of weak voltage signals by using the two analog-to-digital converters to obtain digital sampling data of the two groups of weak voltage signals;
the analog-to-digital conversion of the relay protection voltage quantity has a full-cycle Fourier integration algorithm, a half-cycle Fourier integration algorithm and the like according to different requirements, wherein the full-cycle Fourier integration algorithm needs sampling time of one period, namely 20 milliseconds of sampling data window time for a 50Hz power system, and the half-cycle Fourier integration algorithm is 10 milliseconds of sampling data window time. If the analog-to-digital conversion module for protection is adopted, the basic function can be completed, if special requirements exist, the analog-to-digital conversion module for the protection device adopts a full-cycle Fourier integration algorithm, and the analog-to-digital conversion module for the voltage loop abnormality detection device adopts a half-cycle Fourier integration algorithm, so that the time of a sampling data window is reduced, and the voltage sampling loop abnormality judgment is quicker.
And (1-4) comparing the digital sampling data of the two groups of weak voltage signals by the CPU to determine whether the voltage transformer loop is abnormal.
Using the following formula to pair UA1、UB1、UC1And UA2、UB2、UC2Comparing to obtainAnd
wherein,is UA1The vector of (a) is determined,is UA2The vector of (a) is determined,the a-phase vector difference of the two sets of weak voltage signals,is UB1The vector of (a) is determined,is UB2The vector of (a) is determined,is the B phase vector difference of two groups of weak voltage signals,is UC1The vector of (a) is determined,is UC2The vector of (a) is determined,c-phase vector difference, U, of two groups of weak voltage signalsNORMALThe rated voltage of the voltage transformer;
when MAX (| Δ U)A|，|ΔUB|，|ΔUC|)＞15％UNORMALAnd the CPU judges the abnormity of the voltage transformer loop and controls the alarm to give an alarm.
1. Assuming that the main equipment and the voltage transformer loop of the electric appliance are in a normal operation state, two groups of voltage quantity data sampled by the detection device are normal rated voltage quantities and have consistent phases, and the difference between the two voltage quantities is ideally not greater than the sum of maximum allowable errors of the two voltage quantities.
For example: for a generator end outletThe transmission precision of the two groups of same-voltage transformers is 0.5 grade, the allowable transmission error of the two groups of same-voltage transformers in normal transmission is +/-0.5 percent, the difference between the two groups of same-voltage transformers is not more than 1 percent at most, and the difference between the two groups of same-voltage transformers is not more than 5 percent in consideration of the error possibly existing in sampling by a detection device.
2. If the equipment is in a primary system fault state, the voltage transformer loop is in a normal operation state, two groups of voltage quantity data sampled by the detection device have large changes at the same time, the changes still meet the precision requirement, and the normal operation states are similar.
3. Assuming that the equipment is in a normal operation state, wherein one group of voltage transformer loops is in an abnormal state, two groups of voltage quantity data obtained by sampling by the detection device are in a normal state and in an abnormal state, and the two groups have large deviation.
For example: for C-phase single-phase line break, the three-phase voltage changes from the original three 100V as follows:
Uab＝100(V)
Ubc＝Uca＝100/2＝50(V)
there will be a large deviation in the two sets of voltage quantity data sampled by the detection device.
4. Assuming that the equipment is in a primary system fault state, wherein one group of voltage transformer loops are in an abnormal state, the detection device samples two groups of voltage quantity data, one group is under the condition of voltage change in the fault state, and the other group is under the fault state and the voltage of the voltage transformer loops is abnormal.
If the phase voltage of the C phase is reduced to 70% of the original voltage when a phase-C single-phase ground fault occurs, and the phase-C disconnection occurs in a group of voltage transformer loops, as can be seen from the above example, the abnormal voltage deviation of the voltage transformer loops is still over 30%, and the sampling error deviation is generally not greater than 5%, and the deviation obtained by comparing the two is still the abnormal voltage deviation of the voltage transformer loops, including partial sampling error deviation.
As shown in fig. 1, the transformer further comprises a second converter 6 and a second digital-to-analog converter 7, wherein the second converter is connected with three phases of another secondary coil of the same type of the voltage transformer, the second converter is electrically connected with the second digital-to-analog converter, and the second digital-to-analog converter is electrically connected with the CPU; the second digital-to-analog converter outputs auxiliary voltage sampling data UA3、UB3、UC3；
Will UA3、UB3、UC3And UA1、UB1、UC1And (3) comparison:
computing
When MAX (| Δ U)A|，|ΔUB|，|ΔUC|)＞15％UNORMALThe CPU judges that the voltage transformer loop is abnormal;
will UA3、UB3、UC3And UA2、UB2、UC2And (3) comparison:
and (3) calculating:
when MAX (| Δ U)A|，|ΔUB|，|ΔUC|)≤15％UNORMALIf the CPU judges that the voltage transformer loop is normal, the CPU will UA1、UB1、UC1Abandon, add UA2、UB2、UC2As a normal amount of voltage.
If the voltage loop does not have auxiliary voltage sampling data, the traditional method for judging the positive and negative sequence components of the electrical quantity sampling data and the corresponding logical relationship can be adopted to carry out auxiliary correction, the data of the voltage sampling loop with a fault is selected, the group of data is discarded, and the protection device takes the normal voltage quantity of the sampling loop.
After being judged by the voltage transformer loop abnormity detection device, the voltage transformer loop abnormity detection device can output corresponding signals to the voltage transformer loop abnormity protection device, shield abnormal voltage sampling data of the corresponding loop, and also can directly send the sampling data of the voltage transformer loop abnormity detection device to the relay protection device through a network.
The realization of the voltage transformer loop abnormity detection adopting the electronic voltage transformer can be further simplified, and the links before analog-to-digital conversion are reduced.
According to 8.4.8 regulations of the DL/T1543-: the double protection channels respectively meet the accuracy required by GB/T20840.7, and require sampling instantaneous values, namely (larger value-smaller value)/smaller value multiplied by 100% in the same frame message is less than 2%, so that the threshold value can be set lower when the voltage transformer loop abnormity detection of the electronic voltage transformer is realized in the invention.
Under certain conditions, the voltage transformer loop abnormity detection device and the relay protection device can be integrated, so that the voltage transformer loop abnormity detection device becomes a component of the relay protection device.
It should be understood that this example is for illustrative purposes only and is not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Claims (3)
1. The abnormity detection method of the voltage transformer loop is characterized in that the voltage transformer loop comprises a voltage transformer (1) connected with a three-phase power transmission line, two first converters (2) connected with the voltage transformer, two first analog-to-digital converters (3), a CPU (4) and an alarm (5); the two first converters are respectively connected with three phases of two secondary coils of the same type of the voltage transformer; the two first converters are respectively and electrically connected with the two first analog-to-digital converters, and the CPU is respectively and electrically connected with the two first analog-to-digital converters and the alarm; the method comprises the following steps:
(1-1) two groups of three-phase voltages are led out from two homotypic secondary coils of the voltage transformer;
(1-2) the two groups of three-phase voltages are respectively connected with two converters, and the two converters respectively convert the two groups of three-phase voltages into a first group of weak voltage signals UA1、UB1、UC1And a second group of weak voltage signals UA2、UB2、UC2；
(1-3) performing analog-to-digital conversion on the first group of weak voltage signals and the second group of weak voltage signals by using the two analog-to-digital converters to obtain digital sampling data of the two groups of weak voltage signals;
and (1-4) comparing the digital sampling data of the two groups of weak voltage signals by the CPU to determine whether the voltage transformer loop is abnormal.
2. The method for detecting an abnormality in a voltage transformer circuit according to claim 1, wherein (1-4) comprises the steps of:
using the following formula to pair UA1、UB1、UC1And UA2、UB2、UC2Comparing to obtainAnd
wherein,is UA1The vector of (a) is determined,is UA2The vector of (a) is determined,the a-phase vector difference of the two sets of weak voltage signals,is UB1The vector of (a) is determined,is UB2The vector of (a) is determined,is the B phase vector difference of two groups of weak voltage signals,is UC1The vector of (a) is determined,is UC2The vector of (a) is determined,c-phase vector difference, U, of two groups of weak voltage signalsNORMALThe rated voltage of the voltage transformer;
when MAX (| Δ U)A|，|ΔUB|，|ΔUC|)＞15％UNORMALAnd the CPU judges the abnormity of the voltage transformer loop and controls the alarm to give an alarm.
3. The method for detecting the abnormality of the voltage transformer circuit according to claim 2, further comprising a second converter (6) and a second digital-to-analog converter (7), the second converter and another secondary line of the same type as the voltage transformerThe three phases of the ring are connected, the second converter is electrically connected with the second digital-to-analog converter, and the second digital-to-analog converter is electrically connected with the CPU; the second digital-to-analog converter outputs auxiliary voltage sampling data UA3、UB3、UC3；
Using the step (1-4) to mix UA3、UB3、UC3Are respectively connected with UA1、UB1、UC1And UA2、UB2、UC2Comparing if the auxiliary voltage sample data with UA1、UB1、UC1When comparing, the circuit of the voltage transformer is judged to be abnormal, and the voltage quantity sampling data and the U are assisted at the same timeA2、UB2、UC2When the comparison is carried out, the voltage transformer loop is judged to be normal, and then the CPU enables the U to be connectedA1、UB1、UC1Abandon, add UA2、UB2、UC2As a normal amount of voltage.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113447852A (en) * | 2021-05-07 | 2021-09-28 | 华能澜沧江水电股份有限公司 | Method for detecting disconnection of PT loop at generator terminal without influence of operation condition of generator |
| CN115684844A (en) * | 2023-01-03 | 2023-02-03 | 国网江西省电力有限公司电力科学研究院 | Voltage sampling loop abnormity diagnosis method and system based on dynamic recording data |
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