CN115128442A - Dynamic evaluation method for electrical life of circuit breaker based on full-life operation information - Google Patents
Dynamic evaluation method for electrical life of circuit breaker based on full-life operation information Download PDFInfo
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Abstract
The invention discloses a dynamic evaluation method for the electric life of a circuit breaker based on life-cycle operation information. The method comprises the steps of collecting current information and temperature information of a contact of a circuit breaker, and correspondingly storing the current information and the temperature information of the circuit breaker and time information; acquiring an operation command of the circuit breaker, wherein the operation command comprises a closing command, an opening command and time information for issuing the operation command; matching the stored current information and temperature information of the circuit breaker according to the time information of the issued control command, judging whether the circuit breaker is in a loss action, and if the circuit breaker is in the loss action, calculating the electric service life loss caused by the current action of the circuit breaker according to the current information, the temperature information and the time information before and after the action of the circuit breaker; and outputting an evaluation result according to the preset total electric service life of the circuit breaker and the historical total electric service life loss. The method greatly improves the prediction precision of the electric service life of the circuit breaker and improves accurate data support for maintenance strategies.
Description
Technical Field
The invention relates to the technical field of circuit breaker electric service life evaluation, in particular to a circuit breaker electric service life dynamic evaluation method based on full-life operation information.
Background
To ensure reliability and overhaul economy of equipment in the power system, the stateful overhaul mode gradually replaces the planned overhaul mode. The basis for realizing the state maintenance mode is to realize real-time online state monitoring by acquiring the running information of the equipment, accurately reflect the running condition of the equipment and predict the service life, and thus provide data support for maintenance decision.
The existing circuit breaker usually takes the cut-off current and the cut-off frequency as the basis for evaluating the electric service life, and because the factors influencing the electric service life are more, under the condition of the same cut-off current, different electric service life losses can be generated, so the accuracy of a means for evaluating the electric service life by simply using the cut-off current and the cut-off frequency is relatively low.
Disclosure of Invention
The invention aims to provide a dynamic evaluation method for the electric life of a circuit breaker based on full-life operation information aiming at the defects in the prior art.
In order to achieve the purpose, the invention provides a dynamic evaluation method for the electric life of a circuit breaker based on full-life operation information, which comprises the following steps:
collecting current information and temperature information of a contact of a circuit breaker, and correspondingly storing the current information and the temperature information of the circuit breaker and time information;
acquiring an operation command of a circuit breaker, wherein the operation command comprises a closing command, an opening command and time information for issuing the operation command;
matching the stored current information and temperature information of the circuit breaker according to the time information of the issued control command, judging whether the circuit breaker is in a loss action, and if the circuit breaker is in the loss action, calculating the electric service life loss caused by the current action of the circuit breaker according to the current information, the temperature information and the time information before and after the action of the circuit breaker;
and outputting an evaluation result according to the preset total electric service life of the circuit breaker and the historical total electric service life loss.
Further, when one of the current information before and after the breaker is operated is zero and the other current information is not zero, the breaker is judged to be in a loss operation.
Further, calculating the electric life loss caused by the action according to the current information, the temperature information and the time information before and after the action of the circuit breaker specifically comprises:
if the control instruction is a closing instruction, current information after the breaker is closed is obtained according to time information of the issued control instruction and is used as breaker action current, if the control instruction is a breaking instruction, current information after the breaker is opened is obtained according to the time information of the issued control instruction and is used as breaker action current, and the ratio of the breaker action current to the rated current of the breaker is calculated to be A;
obtaining temperature information T1 before the action of the circuit breaker and temperature information T2 when a time threshold T is set after the action according to the time information of issuing the control command, calculating the temperature rise delta T of the action to the circuit breaker to be T2-T1, and judging whether the temperature rise delta T of the action to the circuit breaker under the current action current is at the set temperature rise threshold T or not thr Within the range of the set temperature rise threshold T thr Within the range, calculating the electrical life loss E ═ Em ×. delta.1 × A caused by the current action of the circuit breaker, wherein Em is the electrical life loss caused by the action of the circuit breaker under the rated current, and delta.1 is a set correlation coefficient threshold value of the electrical life loss delta E changing along with A;
if the temperature exceeds the set temperature rise threshold value T thr The range is calculated according to the temperature rise delta T caused by the action to the circuit breaker and the set temperature rise threshold value T thr And the ratio is B, the electric life loss E (Em, delta 1, A, delta 2, B) caused by the current action of the circuit breaker is calculated, and delta 2 is a set correlation coefficient threshold value of the electric life loss delta E changing along with B.
Further, the set time threshold t is calculated by:
carrying out multiple brake opening tests on the circuit breaker, and acquiring temperature change data before and after the circuit breaker is opened;
after the opening command is issuedTime t required for temperature data to reach the maximum value n ＝t n2 -t n1 N is the serial number of the opening test, the value is a natural number, t n2 Time information corresponding to the temperature data reaching the highest value in the nth test, t n1 Time information of issuing a brake-separating instruction in the nth test is obtained;
obtaining time t from multiple tests n And calculating to obtain a set time threshold t.
Further, the time t is obtained from a plurality of tests n The set time threshold t is obtained by calculation as follows:
for the time t n Accumulating and comparing the accumulated data t N Calculation of the distribution law P (t) x-1 ＜t N ＜t x ) Comprises the following steps:
P(t x-1 ＜t N ＜t x )＝P x
wherein x is 1,2,3 … … M, and M is accumulated data t N Equal division of (d), t x-1 For accumulated data t N Left boundary of x-th interval, t x For accumulated data t N Right boundary of the x-th interval, P x For accumulated data t N At t is located x-1 To t x The probability of (d) in (d);
using the likelihood function pair distribution law P (t) x-1 ＜t N ＜t x ) And (3) calculating:
wherein, L () is a likelihood function, ln () is a natural logarithm;
for ln [ L (t) N )]And (4) carrying out derivation, and enabling the result to be zero so as to calculate the set time threshold t.
Has the beneficial effects that: according to the method, the current information and the temperature information of the static contact of the circuit breaker are collected, whether the current circuit breaker is subjected to loss action causing electric service life loss or not is judged, so that the action not causing the electric service life loss is eliminated, whether temperature rise parameters are introduced or not is judged by monitoring the temperature rise of the contact to carry out electric loss calculation, and finally, an evaluation result is output according to the total electric service life of the circuit breaker and the historical total electric service life loss, so that the prediction precision of the electric service life of the circuit breaker is greatly improved, and the accurate data support is improved for the maintenance strategy.
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Fig. 1 is a schematic flow chart of a dynamic evaluation method for the electrical life of a circuit breaker based on life-cycle operation information.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific examples, which are carried out on the premise of the technical solution of the present invention, and it should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a dynamic evaluation method for an electrical life of a circuit breaker based on life-cycle operation information, including:
the method comprises the steps of collecting current information and temperature information of contacts of the circuit breaker, and correspondingly storing the current information and the temperature information of the circuit breaker and time information. Since the movable contact is not easy to collect because the position of the movable contact changes during the action of the circuit breaker, it is preferable to collect current information and temperature information of the stationary contact. For a three-phase circuit breaker, the current information and the temperature information of a three-phase stationary contact can be collected, and then the current information and the temperature information of the three-phase stationary contact are correspondingly stored with time information.
The method comprises the steps of obtaining an operation command of the circuit breaker, wherein the operation command comprises a closing command, an opening command and time information for issuing the operation command. The control command of the circuit breaker can be obtained, so that the circuit breaker can be used for preliminarily judging when the circuit breaker executes what action.
And matching the stored current information and temperature information of the circuit breaker according to the time information of the issued control command, and judging whether the circuit breaker is in loss action. The loss operation here means that the breaker performs an opening operation when the contacts have a current in a closed state, or performs a closing operation when the breaker performs an opening state when a voltage difference exists between stationary contacts of the input terminal and the output terminal, and an electric life loss occurs during the loss operation. The judgment can be performed through the current information before and after the breaker acts, specifically, if one of the current information before and after the breaker acts is zero and the other current information is not zero, the breaker acts as a loss action. Taking the opening operation as an example, before the breaker is opened, the contact of the breaker has a load current, and after the breaker is opened, the current of the breaker becomes 0; when the closing action is executed, the contact current of the circuit breaker before closing is 0, and the contact current becomes the load current after closing, and the magnitude of the current after closing is related to the load. It should be noted that the current corresponding to the time of issuing the manipulation command may be directly used as the current before the circuit breaker operates, and when the current information after the circuit breaker operates is determined, an operation response delay threshold needs to be adopted, where the operation response delay threshold is greater than the operation response time of the circuit breaker, and for example, when the operation response time of the circuit breaker is 0.05s, the current 0.1s after the time of issuing the manipulation command may be used as the current after the circuit breaker operates.
If the circuit breaker is judged to be a loss action, the circuit breaker is operated at this time to calculate the electric service life loss. The electric service life loss caused by the action is calculated according to current information, temperature information and time information before and after the action of the circuit breaker, and the method specifically comprises the following steps:
if the control instruction is a closing instruction, current information after the breaker is closed is obtained according to time information of issuing the control instruction and is used as breaker action current, if the control instruction is a switching-off instruction, current information after the breaker is switched off is obtained according to the time information of issuing the control instruction and is used as breaker action current, and the ratio of the breaker action current to the rated current of the breaker is calculated to be A.
Obtaining temperature information T1 before the action of the circuit breaker and temperature information T2 when a time threshold T is set after the action according to the time information of issuing the control command, calculating the temperature rise delta T of the action to the circuit breaker to be T2-T1, and judging whether the temperature rise delta T of the action to the circuit breaker under the current action current is at the set temperature rise threshold T or not thr Within the range of the set temperature rise threshold T thr Within the range, the electricity caused by the current action of the circuit breaker is calculatedLife loss E is Em δ 1 a, where Em is the electrical life loss caused by the circuit breaker operation at rated current, and δ 1 is a correlation coefficient threshold value of the set electrical life loss δ E varying with a.
If the temperature exceeds the set temperature rise threshold value T thr The range is calculated according to the temperature rise delta T caused by the action to the circuit breaker and the set temperature rise threshold value T thr The ratio of the two is B, the electric life loss E (Em, delta 1, A, delta 2, B) caused by the current action of the circuit breaker is calculated, delta 2 is a set correlation coefficient threshold value of the electric life loss delta E changing along with B, and the delta 1 and the delta 2 can be obtained through simulation tests according to the characteristics of the circuit breaker. The temperature rise delta T caused by the action on the circuit breaker can reflect the action condition, when the conditions such as longer arc discharge time, poor contact in the closing process and the like occur, the temperature rise of the contact can be increased, the electric service life loss caused by the action is larger, and the evaluation precision can be improved by introducing a temperature rise parameter.
After the electric service life loss delta E caused by the action is calculated, an evaluation result can be output according to the preset total electric service life of the circuit breaker and the historical total electric service life loss. The total electrical life of the circuit breaker is preset according to the characteristics of the circuit breaker, and can be used as an output evaluation result in a percentage mode, for example, if the initial value of the electrical life of a new circuit breaker or a circuit breaker just after maintenance is 100%, the historical total electrical life loss is 70%, the electrical life evaluation result can be output as the remaining 30%, and the output electrical life evaluation result can provide data support for maintenance. In addition, the historical total electrical life loss refers to the service life limit of the current period, that is, after each overhaul is completed, the historical total electrical life loss is cleared, and the electrical life of the overhauled circuit breaker can also be reduced by a preset value of the electrical life according to the actual situation. In the case of a three-phase circuit breaker, the above-described electric loss calculation and accumulation are performed based on the current information and temperature information of the three-phase stationary contacts, and finally, the electric life remaining minimum is output as the present evaluation result.
The connection position of the fixed contact and the movable contact of the circuit breaker can reach the maximum value of temperature rise at the moment of action, and the maximum value of the temperature rise of the measuring point can have a certain time delay because the measuring point cannot be the connection position of the fixed contact and the movable contact, and the set time threshold t is calculated in the following mode:
and carrying out multiple brake opening tests on the circuit breaker, and acquiring temperature change data before and after the circuit breaker is opened.
Acquiring the time t required by the temperature data to reach the maximum value after the brake-separating instruction is issued n ＝t n2 -t n1 N is the serial number of the opening test, the value is a natural number, t n2 Time information corresponding to the temperature data reaching the highest value in the nth test, t n1 The time information of the brake-off command is issued in the nth test.
Obtaining time t from multiple tests n And calculating to obtain a time threshold t. Preferably calculated in the following way:
for time t n Accumulating and comparing the accumulated data t N Calculation of the distribution law P (t) x-1 ＜t N ＜t x ) Comprises the following steps:
P(t x-1 ＜t N ＜t x )＝P x
wherein, x is 1,2,3 … … M, and M is the accumulated data t N Equal division of (d), t x-1 For accumulated data t N Left boundary of the x-th interval, P x For accumulated data t N Right boundary of the x-th interval, P x For accumulated data t N At t x-1 To t x The probability of (c) in (d).
Using the likelihood function pair distribution law P (t) x-1 ＜t N ＜t x ) And (3) calculating:
wherein, L () is a likelihood function, ln () is a natural logarithm;
for ln [ L (t) N )]And (4) carrying out derivation, and making the result zero to calculate a set time threshold value t, wherein the time threshold value t calculated in the above way is closest to the real situation.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that other parts not specifically described are within the prior art or common general knowledge to those of ordinary skill in the art. Without departing from the principle of the invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the scope of the invention.
Claims (5)
1. A dynamic evaluation method for the electric life of a circuit breaker based on full-life operation information is characterized by comprising the following steps:
collecting current information and temperature information of a contact of a circuit breaker, and correspondingly storing the current information and the temperature information of the circuit breaker and time information;
acquiring an operation command of a circuit breaker, wherein the operation command comprises a closing command, an opening command and time information for issuing the operation command;
matching the stored current information and temperature information of the circuit breaker according to the time information of the issued control command, judging whether the circuit breaker is in a loss action, and if the circuit breaker is in the loss action, calculating the electric service life loss caused by the current action of the circuit breaker according to the current information, the temperature information and the time information before and after the action of the circuit breaker;
and outputting an evaluation result according to the preset total electric service life of the circuit breaker and the historical total electric service life loss.
2. The dynamic evaluation method for the electrical life of the circuit breaker based on the full-life operation information as claimed in claim 1, wherein when one of the current information before and after the circuit breaker is operated is zero and the other current information is not zero, the circuit breaker is determined to be in a loss operation.
3. The dynamic evaluation method for the electric life of the circuit breaker based on the full-life operation information according to claim 1, wherein the step of calculating the electric life loss caused by the current action according to the current information, the temperature information and the time information before and after the circuit breaker acts specifically comprises the steps of:
if the control instruction is a closing instruction, current information after the breaker is closed is obtained according to time information of the issued control instruction and is used as breaker action current, if the control instruction is a breaking instruction, current information after the breaker is opened is obtained according to the time information of the issued control instruction and is used as breaker action current, and the ratio of the breaker action current to the rated current of the breaker is calculated to be A;
obtaining temperature information T1 before the action of the circuit breaker and temperature information T2 when a time threshold T is set after the action according to the time information of issuing the control command, calculating the temperature rise delta T of the action to the circuit breaker to be T2-T1, and judging whether the temperature rise delta T of the action to the circuit breaker under the current action current is at the set temperature rise threshold T or not thr Within the range of the set temperature rise threshold T thr Within the range, calculating the electric life loss E (Em & ltδ 1 & gtA) caused by the current action of the circuit breaker, wherein Em is the electric life loss caused by the action of the circuit breaker under rated current, and δ 1 is a set correlation coefficient threshold value of the electric life loss δ E changing along with A;
if the temperature exceeds the set temperature rise threshold value T thr The range is calculated according to the temperature rise delta T caused by the action to the circuit breaker and the set temperature rise threshold value T thr And the ratio is B, the electric life loss E (Em, delta 1, A, delta 2, B) caused by the current action of the circuit breaker is calculated, and delta 2 is a set correlation coefficient threshold value of the electric life loss delta E changing along with B.
4. The dynamic evaluation method for the electric life of the circuit breaker based on the full-life operation information as claimed in claim 3, wherein the set time threshold t is calculated by the following method:
carrying out multiple brake opening tests on the circuit breaker, and acquiring temperature change data before and after the circuit breaker is opened;
acquiring the time t required by the temperature data to reach the maximum value after the brake-separating instruction is issued n ＝t n2 -t n1 N is the serial number of the opening test, the value is a natural number, t n2 Time information t corresponding to the highest value of temperature data in the nth test n1 Is the nth timeTime information of a brake separating instruction is issued in a test;
obtaining time t from multiple tests n And calculating to obtain a set time threshold t.
5. The dynamic evaluation method for the electric life of the circuit breaker based on the full-life operation information as claimed in claim 4, characterized in that the time t is obtained according to a plurality of tests n The set time threshold t is obtained by calculation as follows:
for the time t n Accumulating and comparing the accumulated data t N Calculation of the distribution law P (t) x-1 ＜t N ＜t x ) Comprises the following steps:
P(t x-1 ＜t N ＜t x )＝P x
wherein, x is 1,2,3 … … M, and M is the accumulated data t N Equal division of (d), t x-1 For accumulated data t N Left boundary of x-th interval, t x For accumulated data t N Right boundary of the x-th interval, P x For accumulated data t N At t x-1 To t x The probability of (d) in (d);
using the likelihood function pair distribution law P (t) x-1 ＜t N ＜t x ) And (3) calculating:
wherein, L () is a likelihood function, ln () is a natural logarithm;
for ln [ L (t) N )]And (4) carrying out derivation and making the result zero so as to calculate the set time threshold value t.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116908674A (en) * | 2023-09-12 | 2023-10-20 | 川开电气有限公司 | Method and system for monitoring and predicting residual life of circuit breaker |
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