CN117269679A - Method for judging external insulation state of high-voltage circuit breaker based on fundamental wave electric field duty ratio - Google Patents
Method for judging external insulation state of high-voltage circuit breaker based on fundamental wave electric field duty ratio Download PDFInfo
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- 230000005684 electric field Effects 0.000 title claims abstract description 77
- 238000009422 external insulation Methods 0.000 title claims abstract description 64
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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Abstract
The invention discloses a method for judging the external insulation state of a high-voltage circuit breaker based on the duty ratio of a fundamental wave electric field, which is characterized in that an electric field intensity measuring sensor and a gas sensor are respectively arranged on an A phase upright post, a B phase upright post and a C phase upright post of the high-voltage circuit breaker, and the following steps are executed: firstly setting the acquisition frequency of an electric field intensity measurement sensor and an air-sensitive sensor, collecting acquired data to form a set, then setting a time period for judging the external insulation state, calculating the three-phase fundamental wave electric field duty ratio of the high-voltage circuit breaker in the time period, and finally judging the external insulation state of the high-voltage circuit breaker through the three-phase fundamental wave electric field duty ratio; the invention adopts the special fundamental wave electric field duty ratio to judge the external insulation state of the high-voltage circuit breaker, so that the high-voltage circuit breaker can judge the external insulation state in normal electrified work, and the state of the high-voltage circuit breaker is more in line with the working state at the moment, so that the effect of judging the external insulation state of the method is better.
Description
Technical Field
The invention particularly relates to a method for judging the external insulation state of a high-voltage circuit breaker based on the fundamental wave electric field duty ratio, and belongs to the technical field of electric equipment monitoring.
Background
The transformer substation is a hub of the power system, and the high-voltage circuit breaker is an important device of the transformer substation, is used for switching on and off load current when the transformer substation normally operates, and is used for cutting off fault current when the transformer substation breaks down. The number of the high-voltage circuit breakers is huge, the bearing voltage is high, once the external insulation of the high-voltage circuit breakers is in a problem, the high-voltage circuit breakers can cause faults of the high-voltage circuit breakers and further cause serious accidents such as power failure and the like of a power grid, for example, a SW4-220 type oil-less circuit breaker in a certain 220kV substation can cause pollution flashover in the case of small rain, and all the power failure of the substation is caused. Therefore, it is important to judge the external insulation state of the high-voltage circuit breaker, and in the prior art, the judging of the external insulation state of the high-voltage circuit breaker mainly comprises the following two methods: 1. visual inspection is performed manually, and whether the porcelain sleeve of the high-voltage circuit breaker is abnormal in appearance such as dirt, cracks and the like or not is checked manually, and whether the porcelain sleeve is burnt or not is checked manually; 2. after the power failure is overhauled, the external insulation state of the high-voltage circuit breaker is judged by a high-frequency partial discharge method. However, the visual inspection method has the problems that a lot of labor is required and the accuracy of manual judgment is deviated, and the like, and the power failure maintenance method has the problems that the high-voltage circuit breaker is separated from the original electrified state and is different from the operation state in the electrified state, and only partial external insulation faults can be found.
Disclosure of Invention
The invention aims to solve the technical problems that: how to accurately judge the external insulation state of the high-voltage circuit breaker when the high-voltage circuit breaker is electrified.
The technical scheme provided by the invention is as follows: a method for judging the external insulation state of a high-voltage circuit breaker based on the fundamental wave electric field duty ratio is characterized in that an electric field intensity measuring sensor and a gas sensor are respectively arranged on an A phase upright post, a B phase upright post and a C phase upright post of the high-voltage circuit breaker, and the following steps are executed:
step 1: setting the acquisition frequency of the electric field intensity measuring sensor and the gas sensorThe electric field intensity measuring sensor is arranged according to the acquisition frequency +.>The collected total electric field intensity data and fundamental wave electric field intensity data on the A phase, the B phase and the C phase of the high-voltage circuit breaker are respectively collected to form an A phase total electric field intensity data set E A Data set E of total electric field intensity of B phase B Data set E of C-phase total electric field intensity C A phase fundamental wave electric field intensity data set>B-phase fundamental wave electric field intensity data set +.>And C-phase fundamental electric field intensity data set +.>The gas sensor is set at the acquisition frequency +.>The collected data are collected to form a gas concentration data set I C (t)；
Step 2: setting a time period T for judging the external insulation state of the high-voltage circuit breaker each time, wherein the time period is the accumulation of n times of sampling time continuously carried out by the electric field intensity measuring sensor, n is more than or equal to 100, and n is a multiple of 100;
step 3: the A-phase fundamental wave duty ratio of the high-voltage circuit breaker in the time period T is calculated by the following formula (1)B-phase fundamental wave duty ratio->And C phase fundamental wave ratio->
In formula (1), i ε { A, B, C }; e (E) i (t) is a sequence formed by i-phase total electric field intensity data acquired by the electric field intensity measuring sensor in a judging period;
step 4: if the A phase fundamental wave duty ratioIf the following formula (2) or (3) is satisfied, the external insulation state of the high-voltage circuit breaker is judged to be bad, an external insulation state early warning signal is sent out,
in formula (3), maxE A (t) is the E A Maximum data in (t), minE A (t) is the E A Minimum data in (t);
if the A phase fundamental wave duty ratioIf the formula (2) or (3) is not satisfied, judging that the external insulation state of the high-voltage circuit breaker is normal;
if the B phase fundamental wave duty ratioSatisfying the following (4) or (5), determining that the external insulation state of the high-voltage circuit breaker is not good, sending an external insulation state early warning signal,
in formula (5), maxE B (t) is the E B Maximum data in (t), minE B (t) is the E B Minimum data in (t);
if the B phase fundamental wave duty ratioIf the formula (4) or (5) is not satisfied, judging that the external insulation state of the high-voltage circuit breaker is normal;
if the C phase fundamental wave duty ratioSatisfying the following (6) or (7), determining that the external insulation state of the high-voltage circuit breaker is not good, sending an external insulation state early warning signal,
in formula (7), maxE C (t) is the E C Maximum data in (t), minE C (t) is the E C Minimum data in (t);
if the C phase fundamental wave duty ratioAnd (3) if the formula (6) or (7) is not satisfied, judging that the external insulation state of the high-voltage circuit breaker is normal.
Further, the following steps may be further performed after the step 4:
step 5: the three-phase fundamental wave electric field intensity mutation quantity E of the high-voltage circuit breaker in the t-th sampling in the time period is calculated by the following formula (8) Δ (t)，
In the formula (8), the amino acid sequence of the compound,and->Are respectively said->And->Fundamental wave electric field intensity data at the t-th sampling in the time period; m is a constant, and the general value is 15-25; t is a natural number greater than zero and less than or equal to n;
repeating the formula (8) to calculate and obtain three-phase fundamental wave electric field mutation quantity in each sampling in the time period, and collecting the three-phase fundamental wave electric field mutation quantity to form a three-phase fundamental wave electric field mutation quantity set E Δ ；
Step 6: if the three-phase fundamental wave electric field abrupt quantity set E Δ And the gas concentration data set I C After the number of times that the data in (t) satisfies the following formula (9) or (10) exceeds K times, judging that the external insulation state of the high-voltage circuit breaker is not good, sending an external insulation state early warning signal, wherein the data in (t) is a low-voltage circuit breaker, and the high-voltage circuit breaker is a high-voltage circuit breaker
E Δ (t)≥1.2(9)，
If the three-phase fundamental wave electric field abrupt quantity set E Δ And (3) if the number of times that the data in the formula (9) or (10) meets the condition does not exceed K times, judging that the external insulation state of the high-voltage circuit breaker is normal.
The beneficial effects of the invention are as follows: the invention adopts the special field intensity fundamental wave duty ratio to judge the external insulation of the high-voltage circuit breaker, so that the high-voltage circuit breaker works normally in a live state when judging the external insulation state, and the test environment is more accurate; the method adopts data acquisition and remote data processing judgment, so that the whole judgment process can be automatically carried out, and meanwhile, the method can conveniently and accurately judge the external insulation state because the internal structure of the high-voltage circuit breaker is not required to be changed.
Detailed Description
The method for judging the external insulation state of the high-voltage circuit breaker based on the fundamental wave electric field duty ratio is further described in the following with reference to the specific embodiment
The invention discloses a method for judging the external insulation state of a high-voltage circuit breaker based on the duty ratio of a fundamental wave electric field, which is characterized in that an electric field intensity measuring sensor and a gas sensor are respectively arranged on an A phase upright post, a B phase upright post and a C phase upright post of the high-voltage circuit breaker, and the following steps are executed:
step 1: setting the acquisition frequency of the electric field intensity measuring sensor and the gas sensorThe electric field intensity measuring sensor is arranged according to the acquisition frequency +.>The collected total electric field intensity data and fundamental wave electric field intensity data on the A phase, the B phase and the C phase of the high-voltage circuit breaker are respectively collected to form an A phase total electric field intensity data set E A Data set E of total electric field intensity of B phase B Data set E of C-phase total electric field intensity C A phase fundamental wave electric field intensity data set>B-phase fundamental wave electric field intensity data set +.>And C-phase fundamental electric field intensity data set +.>The gas sensor is set at the acquisition frequency +.>The collected data are collected to form a gas concentration data set I C (t)；
Step 2: setting a time period T for judging the external insulation state of the high-voltage circuit breaker each time, wherein the time period is the accumulation of n times of sampling time continuously carried out by the electric field intensity measuring sensor, n is more than or equal to 100, and n is a multiple of 100;
step 3: the A-phase fundamental wave duty ratio of the high-voltage circuit breaker in the time period T is calculated by the following formula (1)B-phase fundamental wave duty ratio->And C phase fundamental wave ratio->
In formula (1), i ε { A, B, C }; e (E) i (t) is a sequence formed by i-phase total electric field intensity data acquired by the electric field intensity measuring sensor in a judging period;
step 4: if the A phase fundamental wave duty ratioIf the following formula (2) or (3) is satisfied, the external insulation state of the high-voltage circuit breaker is judged to be bad, an external insulation state early warning signal is sent out,
in formula (3), maxE A (t) is the E A Maximum data in (t), minE A (t) is the E A Minimum data in (t);
if the A phase fundamental wave duty ratioIf the formula (2) or (3) is not satisfied, the method is determinedThe external insulation state of the high-voltage circuit breaker is normal;
if the B phase fundamental wave duty ratioSatisfying the following (4) or (5), determining that the external insulation state of the high-voltage circuit breaker is not good, sending an external insulation state early warning signal,
in formula (5), maxE B (t) is the E B Maximum data in (t), minE B (t) is the E B Minimum data in (t);
if the B phase fundamental wave duty ratioIf the formula (4) or (5) is not satisfied, judging that the external insulation state of the high-voltage circuit breaker is normal;
if the C phase fundamental wave duty ratioSatisfying the following (6) or (7), determining that the external insulation state of the high-voltage circuit breaker is not good, sending an external insulation state early warning signal,
in formula (7), maxE C (t) is the E C Maximum data in (t), minE C (t) is the E C Minimum data in (t);
if the C phase fundamental wave duty ratioAnd (3) if the formula (6) or (7) is not satisfied, judging that the external insulation state of the high-voltage circuit breaker is normal.
And (3) repeating the steps 2 to 4, and judging the whole external insulation state of the running process of the high-voltage circuit breaker.
Example two
In this embodiment, after step 4 in the first embodiment, the following steps are further performed:
step 5: the three-phase fundamental wave electric field intensity mutation quantity E of the high-voltage circuit breaker in the t-th sampling in the time period is calculated by the following formula (8) Δ (t)，
In the formula (8), the amino acid sequence of the compound,and->Are respectively said->And->Fundamental wave electric field intensity data at the t-th sampling in the time period; m is a constant, and the general value is 15-25; t is a natural number greater than zero and less than or equal to n;
repeating the formula (8) to calculate and obtain three-phase fundamental wave electric field mutation quantity in each sampling in the time period, and collecting the three-phase fundamental wave electric field mutation quantity to form a three-phase fundamental wave electric field mutation quantity set E Δ ；
Step 6: if the three-phase fundamental wave electric field abrupt quantity set E Δ And the gas concentration data set I C After the number of times that the data in (t) satisfies the following formula (9) or (10) exceeds K times, judging that the external insulation state of the high-voltage circuit breaker is not good, sending an external insulation state early warning signal, wherein the data in (t) is a low-voltage circuit breaker, and the high-voltage circuit breaker is a high-voltage circuit breaker
E Δ (t)≥1.2(9)，
If the three-phase fundamental wave electric field abrupt quantity set E Δ And (3) if the number of times that the data in the formula (9) or (10) meets the condition does not exceed K times, judging that the external insulation state of the high-voltage circuit breaker is normal.
And (3) repeating the steps 2 to 6, and judging the whole external insulation state of the running process of the high-voltage circuit breaker.
Claims (2)
1. A method for judging the external insulation state of a high-voltage circuit breaker based on the fundamental wave electric field duty ratio is characterized by comprising the following steps: an electric field intensity measuring sensor and a gas sensor are respectively arranged on an A phase upright post, a B phase upright post and a C phase upright post of the high-voltage circuit breaker, and the following steps are executed:
step 1: setting the acquisition frequency of the electric field intensity measuring sensor and the gas sensorThe electric field intensity measuring sensor is arranged according to the acquisition frequency +.>The collected total electric field intensity data and fundamental wave electric field intensity data on the A phase, the B phase and the C phase of the high-voltage circuit breaker are respectively collected to form an A phase total electric field intensity data set E A Data set E of total electric field intensity of B phase B Data set E of C-phase total electric field intensity C A phase fundamental wave electric field intensity data set>B-phase fundamental wave electric field intensity data set +.>And C-phase fundamental electric field intensity data set +.>The gas sensor is set at the acquisition frequency +.>The collected data are collected to form a gas concentration data set I C (t)；
Step 2: setting a time period T for judging the external insulation state of the high-voltage circuit breaker each time, wherein the time period is the accumulation of n times of sampling time continuously carried out by the electric field intensity measuring sensor, n is more than or equal to 100, and n is a multiple of 100;
step 3: the A-phase fundamental wave duty ratio of the high-voltage circuit breaker in the time period T is calculated by the following formula (1)B-phase fundamental wave duty ratio->And C phase fundamental wave ratio->
In formula (1), i ε { A, B, C }; e (E) i (t) is a sequence formed by i-phase total electric field intensity data acquired by the electric field intensity measuring sensor in a judging period;
step 4: if the A phase fundamental wave duty ratioIf the following formula (2) or (3) is satisfied, the external insulation state of the high-voltage circuit breaker is judged to be bad, an external insulation state early warning signal is sent out,
in formula (3), maxE A (t) is the E A Maximum data in (t), minE A (t) is the E A Minimum data in (t);
if the A phase fundamental wave duty ratioIf the formula (2) or (3) is not satisfied, judging that the external insulation state of the high-voltage circuit breaker is normal;
if the B phase fundamental wave duty ratioSatisfying the following (4) or (5), determining that the external insulation state of the high-voltage circuit breaker is not good, sending an external insulation state early warning signal,
in formula (5), maxE B (t) is the E B Maximum data in (t), minE B (t)Is said E B Minimum data in (t);
if the B phase fundamental wave duty ratioIf the formula (4) or (5) is not satisfied, judging that the external insulation state of the high-voltage circuit breaker is normal;
if the C phase fundamental wave duty ratioSatisfying the following (6) or (7), determining that the external insulation state of the high-voltage circuit breaker is not good, sending an external insulation state early warning signal,
in formula (7), maxE C (t) is the E C Maximum data in (t), minE C (t) is the E C Minimum data in (t);
if the C phase fundamental wave duty ratioAnd (3) if the formula (6) or (7) is not satisfied, judging that the external insulation state of the high-voltage circuit breaker is normal.
2. The method for judging the external insulation state of the high-voltage circuit breaker based on the fundamental electric field duty ratio according to claim 1, wherein the method comprises the following steps: the following steps may be further performed after the step 4:
step 5: the three-phase fundamental wave electric field intensity mutation quantity E of the high-voltage circuit breaker in the t-th sampling in the time period is calculated by the following formula (8) Δ (t)，
In the formula (8), the amino acid sequence of the compound,and->Are respectively said->And->Fundamental wave electric field intensity data at the t-th sampling in the time period; m is a constant, and the general value is 15-25; t is a natural number greater than zero and less than or equal to n;
repeating the formula (8) to calculate and obtain three-phase fundamental wave electric field mutation quantity in each sampling in the time period, and collecting the three-phase fundamental wave electric field mutation quantity to form a three-phase fundamental wave electric field mutation quantity set E Δ ；
Step 6: if the three-phase fundamental wave electric field abrupt quantity set E Δ And the gas concentration data set I C After the number of times that the data in (t) satisfies the following formula (9) or (10) exceeds K times, judging that the external insulation state of the high-voltage circuit breaker is not good, sending an external insulation state early warning signal, wherein the data in (t) is a low-voltage circuit breaker, and the high-voltage circuit breaker is a high-voltage circuit breaker
E Δ (t)≥1.2(9)，
If the three-phase fundamental wave electric field abrupt quantity set E Δ The data in (2) satisfies the condition of the formula (9) or (10) for not more than K times, and the high-voltage break is determinedThe external insulation state of the circuit breaker is normal.
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