CN115308581A - Method and system for evaluating electric service life of filter bank circuit breaker - Google Patents
Method and system for evaluating electric service life of filter bank circuit breaker Download PDFInfo
- Publication number
- CN115308581A CN115308581A CN202111562824.4A CN202111562824A CN115308581A CN 115308581 A CN115308581 A CN 115308581A CN 202111562824 A CN202111562824 A CN 202111562824A CN 115308581 A CN115308581 A CN 115308581A
- Authority
- CN
- China
- Prior art keywords
- circuit breaker
- filter bank
- contact resistance
- bank circuit
- contact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
- G01R31/3272—Apparatus, systems or circuits therefor
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Breakers (AREA)
Abstract
The invention discloses a method and a system for evaluating the electric service life of a filter bank breaker, and belongs to the technical field of evaluation of the electric service life of the breaker. The method comprises the following steps: the method comprises the steps of carrying out dynamic contact resistance curve testing on a filter bank circuit breaker which is newly delivered from a factory so as to obtain a testing result, and obtaining design parameters of the filter bank circuit breaker which is newly delivered from the factory; determining fault diagnosis reference parameters according to the test result and the design parameters; the method comprises the steps of determining the fault type of a commissioned filter bank circuit breaker or a newly assembled circuit breaker according to the commissioned filter bank circuit breaker or the newly assembled circuit breaker, then carrying out dynamic contact resistance curve measurement, obtaining a measurement result, and determining the electric life of the commissioned filter bank circuit breaker or the newly assembled circuit breaker according to the measurement result and a reference parameter of the same type of filter bank circuit breaker. The invention solves the problem that the current filter bank circuit breaker electric service life evaluation lacks pertinence and accuracy.
Description
Technical Field
The present invention relates to the field of circuit breaker application technologies, and more particularly, to a method and system for evaluating the electrical lifetime of a filter bank circuit breaker.
Background
Circuit breakers, as switching elements in electrical power systems, assume important functions of control and protection, the electrical life of which is generally dependent on the state of erosion of the arcing contacts. The filter group circuit breakers in the converter station act frequently relative to other circuit breakers, high-amplitude high-frequency inrush current can be generated in the closing process, the opening and closing performance of contacts and nozzles of an arc extinguish chamber can be seriously reduced under the cumulative closing electric arc ablation and mechanical abrasion, the risk of re-ignition, failure and even explosion can occur, and the operation safety of a power grid is seriously influenced. Safety accidents caused by the reduction of the arc extinguishing capability of the circuit breaker occur in the power system, and the breaking frequency of the circuit breaker is far lower than the specified frequency. At present, no effective evaluation method for the electric service life of the filter bank circuit breaker exists.
The common method for evaluating the electrical service life of the circuit breaker mainly comprises an electrical service life formula method, static resistance measurement and dynamic resistance measurement. The electric life formula method indirectly evaluates the arc extinguishing characteristics of the circuit breaker through the weighted calculation of the on-off times and the on-off current, is insufficient in calculation accuracy and universality for various types of circuit breakers, is mainly used for the situation of large arc ablation, and is not suitable for the electric life evaluation of the filter bank circuit breaker. The static resistance method is used for measuring the resistance value of a main loop of the circuit breaker in a closing state, the current specified static main loop resistance is not higher than a factory measured value of 1.2 times, so that the contact state of the circuit breaker is reflected, but the static main loop resistance only can reflect the steady-state loop resistance of the circuit breaker in the closing state, the problems of the change of physicochemical parameters such as roughness and the like caused by the friction and melting of a contact material after opening and closing current and the reduction of the current opening and closing capacity cannot be represented, and the contact state is difficult to reflect actually. The dynamic resistance method is used for measuring dynamic contact resistance of a breaker contact in a switching-off or switching-on process, a dynamic resistance curve of the ablated contact can change obviously, mainly embodied in the increase of the dynamic resistance and the shortening of the length of the curve, and the curve after ablation can be compared with an initial curve to be used as a basis for judging the state of the contact. At present, a method for detecting the contact state of the contact of the arc extinguish chamber is a dynamic resistance measurement method.
The arc contact of the filter bank circuit breaker is continuously ablated by electric arc and generates mechanical abrasion by itself, and the appearance of the arc contact is as follows: the difference value of the inner diameter and the outer diameter between the moving arc contact and the static arc contact is continuously increased, namely the arc contact becomes thin; the contact stroke of the arc contact is continuously reduced, namely the arc contact is shortened; the contact resistance of the arc contact is continuously increased and the volatility is enhanced, namely the surface of the arc contact is uneven; in addition, the circuit breaker may also have contact faults such as poor arc contact centering and poor fastening in the manufacturing process in a factory or the field operation process, and the contact faults may affect the operation safety. Therefore, the dynamic resistance method can well reflect the ablation state of the contact in theory and further judge the on-off capability of the contact, but the amount of information contained in the curve is large, the extraction of characteristic parameters needs to be further optimized, and no systematic research and accepted and generalizable evaluation scheme exists in the method at present.
Disclosure of Invention
In view of the above problems, the present invention provides a method for evaluating the electrical lifetime of a filter bank circuit breaker, comprising:
the method comprises the steps of carrying out dynamic contact resistance curve testing on a filter bank circuit breaker which is newly delivered from a factory so as to obtain a testing result, and obtaining design parameters of the filter bank circuit breaker which is newly delivered from the factory;
determining fault diagnosis reference parameters according to the test result and the design parameters;
the method comprises the steps of determining the fault type of a commissioned filter bank circuit breaker or a newly assembled circuit breaker according to the commissioned filter bank circuit breaker or the newly assembled circuit breaker, then carrying out dynamic contact resistance curve measurement, obtaining a measurement result, and determining the electric life of the commissioned filter bank circuit breaker or the newly assembled circuit breaker according to the measurement result of the same type of filter bank circuit breaker and a reference parameter.
Optionally, the test result includes: the overshoot of the arc contact and the main contact of the filter bank circuit breaker which is newly delivered from a factory, the average value of the dynamic contact resistance in the overshoot area and a dynamic contact resistance curve chart are obtained.
Optionally, the fault diagnosis reference parameters include: the over-travel difference of an arc contact and a main contact of the filter bank circuit breaker, the average value of the dynamic contact resistance of an over-travel difference area and a dynamic contact resistance curve graph.
Optionally, the fault types include: contact-type faults and ablation-type faults.
Optionally, the determining the electrical life of the filter bank circuit breaker already put into operation or the newly assembled circuit breaker with respect to the measurement result and the reference parameter of the same model of filter bank circuit breaker includes:
when the fault type of the filter bank circuit breaker is determined to be a contact type fault,
if the average value of the dynamic contact resistance in the over-travel difference area is greater than 20% of the reference parameter of the average value of the contact resistance in the fault diagnosis state, recording the filter bank circuit breaker;
if the average value of the dynamic contact resistance in the over-range difference area is greater than 50% of the reference parameter of the average value of the contact resistance in the fault diagnosis state, the arc extinguish chamber where the filter bank breaker is located is overhauled;
if the over travel difference of the arc contact and the main contact is more than 10% of the reference parameter of the over travel difference of the fault diagnosis arc contact and the main contact, the filter bank circuit breaker records;
and if the over travel difference between the arc contact and the main contact is more than 20% of the reference parameter of the over travel difference between the fault diagnosis arc contact and the main contact, the arc extinguish chamber where the filter bank circuit breaker is located is overhauled.
Optionally, the determining the electrical life of the filter bank circuit breaker already put into operation or the newly assembled circuit breaker with respect to the measurement result and the reference parameter of the same model of filter bank circuit breaker includes:
when the fault type of the filter bank circuit breaker is determined to be ablation type fault,
if the average value of the dynamic contact resistance in the over-travel difference area is greater than 20% of the reference parameter of the average value of the dynamic contact resistance for fault diagnosis, recording the filter bank circuit breaker;
if the average value of the dynamic contact resistance in the over-range difference area is greater than 50% of the reference parameter of the average value of the fault diagnosis dynamic contact resistance, the arc extinguish chamber where the filter bank breaker is located is overhauled;
if the average value of the dynamic contact resistance in the over-travel difference area is larger than 100% of the reference parameter of the average value of the fault diagnosis dynamic contact resistance, replacing an arc contact for the filter bank circuit breaker;
if the over travel difference between the arc contact and the main contact is more than 20% of the reference parameter of the over travel difference between the fault diagnosis arc contact and the main contact, the filter bank circuit breaker records;
and if the over travel difference between the arc contact and the main contact is more than 40% of the reference parameter of the over travel difference between the fault diagnosis arc contact and the main contact, the arc contact is replaced for the filter bank circuit breaker.
Optionally, the dynamic contact resistance curve test is performed through a circuit breaker dynamic contact resistance measurement system, the circuit breaker dynamic contact resistance measurement system comprises: a direct current power supply, a current sensor and a speed sensor;
the direct-current power supply is provided by a storage battery, the voltage of the storage battery is 12V, the internal resistance ri =1m omega, the lead resistance is 3m omega, the current sensor uses a Hall current sensor, and the speed sensor uses a rotary sensor;
the dynamic contact resistance curve test adopts dynamic contact resistance in the opening process of the filter bank circuit breaker as an analysis object;
and the loop current of the dynamic contact resistance measuring system of the circuit breaker is more than 1000A during the measurement of the dynamic contact resistance.
The present invention also provides a system for assessing filter bank circuit breaker electrical life, comprising:
the test module is used for carrying out dynamic contact resistance curve test on the filter bank circuit breaker which is newly delivered from the factory so as to obtain a test result and design parameters of the filter bank circuit breaker which is newly delivered from the factory;
the reference parameter determining module is used for determining a fault diagnosis reference parameter according to the test result and the design parameter;
and the evaluation module is used for carrying out dynamic contact resistance curve measurement after determining the fault type of the commissioned filter bank circuit breaker or the newly assembled circuit breaker aiming at the commissioned filter bank circuit breaker or the newly assembled circuit breaker, acquiring a measurement result, and determining the electric life of the commissioned filter bank circuit breaker or the newly assembled circuit breaker aiming at the measurement result and a reference parameter of the same model of filter bank circuit breaker.
Optionally, the test result includes: the overshoot difference between the arc contact and the main contact of the filter bank circuit breaker which is newly delivered from a factory, the average value of the dynamic contact resistance in the overshoot difference area and a dynamic contact resistance curve chart.
Optionally, the fault diagnosis reference parameters include: the over-travel difference of an arc contact and a main contact of the filter bank circuit breaker, the average value of the dynamic contact resistance of an over-travel difference area and a dynamic contact resistance curve graph.
Optionally, the fault types include: contact-type faults and ablation-type faults.
Optionally, the determining the electrical life of the filter bank circuit breaker already put into operation or the newly assembled circuit breaker with respect to the measurement result and the reference parameter of the same model of filter bank circuit breaker includes:
determining the fault type of the filter bank circuit breaker as a contact fault;
if the average value of the dynamic contact resistance in the over-travel difference area is greater than 20% of the reference parameter of the average value of the contact resistance in the fault diagnosis state, recording the filter bank circuit breaker;
if the average value of the dynamic contact resistance in the over-travel difference area is greater than 50% of the reference parameter of the average value of the contact resistance in the fault diagnosis state, the arc extinguish chamber where the filter bank circuit breaker is located is overhauled;
if the over travel difference of the arc contact and the main contact is more than 10% of the reference parameter of the over travel difference of the fault diagnosis arc contact and the main contact, the filter bank circuit breaker records;
and if the over travel difference between the arc contact and the main contact is more than 20% of the reference parameter of the over travel difference between the fault diagnosis arc contact and the main contact, the arc extinguish chamber where the filter bank circuit breaker is located is overhauled.
Optionally, the determining the electrical life of the filter bank circuit breaker already put into operation or the newly assembled circuit breaker with respect to the measurement result and the reference parameter of the same model of filter bank circuit breaker includes:
determining the fault type of the filter bank circuit breaker as an ablation fault;
if the average value of the dynamic contact resistance in the over-travel difference area is more than 20% of the reference parameter of the average value of the dynamic contact resistance for fault diagnosis, recording the filter bank circuit breaker;
if the average value of the dynamic contact resistance in the over-range difference area is greater than 50% of the reference parameter of the average value of the dynamic contact resistance for fault diagnosis, the arc extinguish chamber where the filter bank circuit breaker is located is overhauled;
if the average value of the dynamic contact resistance in the over-travel difference area is larger than 100% of the reference parameter of the average value of the fault diagnosis dynamic contact resistance, replacing an arc contact for the filter bank circuit breaker;
if the over travel difference between the arc contact and the main contact is more than 20% of the reference parameter of the over travel difference between the fault diagnosis arc contact and the main contact, the filter bank circuit breaker records the over travel difference;
and if the over travel difference between the arc contact and the main contact is more than 40% of the reference parameter of the over travel difference between the fault diagnosis arc contact and the main contact, replacing the arc contact for the filter bank circuit breaker.
Optionally, the dynamic contact resistance curve test is performed through a circuit breaker dynamic contact resistance measurement system, the circuit breaker dynamic contact resistance measurement system comprises: a direct current power supply, a current sensor and a speed sensor;
the direct-current power supply is provided by a storage battery, the voltage of the storage battery is 12V, the internal resistance ri =1m omega, the lead resistance is 3m omega, the current sensor uses a Hall current sensor, and the speed sensor uses a rotary sensor;
the dynamic contact resistance curve test adopts dynamic contact resistance in the opening process of the filter bank circuit breaker as an analysis object;
and the loop current of the dynamic contact resistance measuring system of the circuit breaker is more than 1000A during the measurement of the dynamic contact resistance.
The invention also proposes a computer-readable storage medium having stored thereon a computer program for executing the above-mentioned method of estimating the electrical lifetime of a filter bank circuit breaker.
The present invention also provides an electronic device, including:
a processor;
a memory for storing the processor-executable instructions;
the processor is used for reading the executable instructions from the memory and executing the instructions to realize the method for evaluating the electric service life of the filter bank circuit breaker.
The invention can determine the electric service life of the filter bank circuit breaker which is put into operation or a newly assembled circuit breaker according to the measurement result and the reference parameter of the same model filter bank circuit breaker, solves the problem that the current evaluation of the electric service life of the filter bank circuit breaker lacks pertinence and accuracy, can determine the service life of a short-circuiting device or the safety problem of the circuit breaker, can effectively avoid the problems of long-term overhaul, excessive overhaul, advanced retirement and the like of the filter bank circuit breaker after application, provides good practical guidance for selecting time nodes needing to be overhauled, saves material resources, manpower and financial resources, can avoid sudden on-off faults of the filter bank circuit breaker, ensures the safe and stable operation of a power system, and generates huge social and economic benefits. The method can provide theoretical guidance and engineering practice basis for future direct current transmission engineering construction or upgrading and reconstruction of the existing engineering in China.
Drawings
FIG. 1 is a schematic diagram of the dynamic contact resistance of the circuit breaker of the present invention;
FIG. 2 is a layout diagram of a dynamic contact resistance measurement system for a circuit breaker according to the present invention;
fig. 3 is a graph of typical dynamic contact resistance versus travel for a circuit breaker according to the present invention;
FIG. 4 is a flow chart of the method of the present invention;
FIG. 5 is a graph comparing curves of dynamic contact resistance before and after 10000 mechanical lives of the 110kV circuit breaker in the invention;
FIG. 6 is a dynamic contact resistance measurement curve of the 1000kV breaker with loose contacts;
fig. 7 is a block diagram of the system of the present invention.
Detailed Description
Example embodiments of the present invention will now be described with reference to the accompanying drawings, however, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are provided for a complete and complete disclosure of the invention and to fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The technical principle of the invention is as follows:
the system schematic diagram is shown in fig. 1, a current line and a voltage line are respectively led out from two ends of a tested product, so that voltage U and current I of a tested resistor are obtained, and a corresponding resistance value R = U/I can be calculated based on ohm's law.
The system layout is shown in fig. 2 and mainly comprises a direct current power supply, a current sensor, a speed sensor and the like. The test power supply is provided by a storage battery, the voltage of the storage battery is 12V, the internal resistance ri =1m omega, the lead resistance is estimated to be 3m omega, and the maximum available current of the test loop is 12V/4m omega =3000A. The current sensor uses the Hall current sensor, and compared with a current divider, the Hall current sensor does not need to be connected in series in a measured loop, the open loop structure is convenient to install, and the measured current needs to be paid attention to enabling to pass through the sensor coil according to the correct direction in use. Speed sensor chooses rotary sensor for use, through bolted connection in the pivot of circuit breaker connecting lever case, reliably fixes on circuit breaker body base via the magnetism seat, obtains speed parameter through the corresponding relation conversion of rotation angle and stroke, and it is more convenient to install. The change conditions of contact voltage, current and stroke along with time in the switching-on and switching-off process of the circuit breaker are obtained through a contact dynamic resistance measuring system, and then a dynamic resistance-contact stroke curve is obtained.
The principle of the implementation process of the invention is as follows:
the dynamic contact resistance in the switching-on process of the circuit breaker is selected as an analysis object because the measured value is inaccurate due to the large interference amount in the dynamic contact resistance waveform measured in the switching-on process of the circuit breaker.
When the measuring current is larger, larger electromagnetic holding force can be generated, attachments on the surface of the contact can be eliminated more easily, the contact between the moving arc contact and the static arc contact is more sufficient, the measured value of the dynamic contact resistance is more stable, and the value of the measuring current is larger than 1000A.
The measurement is carried out five times each time, and the most stable curve is taken as the dynamic contact resistance curve of the circuit breaker under the condition. The typical dynamic contact resistance-travel curve diagram of the circuit breaker is shown in fig. 3, wherein the distance La (the over travel difference between the arc contact and the main contact) in the contact stage of the arc contact and the average value of the dynamic contact resistance in the range of La are selected as characteristic values for evaluation.
Based on the above principle, the present invention provides a method for evaluating the electrical lifetime of a filter bank circuit breaker, as shown in fig. 4, including:
the method comprises the steps that dynamic contact resistance curve testing is conducted on a newly-delivered filter bank circuit breaker to obtain a testing result, and design parameters of the newly-delivered filter bank circuit breaker are obtained;
determining fault diagnosis reference parameters according to the test result and the design parameters;
the method comprises the steps of determining the fault type of a commissioned filter bank circuit breaker or a newly assembled circuit breaker according to the commissioned filter bank circuit breaker or the newly assembled circuit breaker, then carrying out dynamic contact resistance curve measurement, obtaining a measurement result, and determining the electric life of the commissioned filter bank circuit breaker or the newly assembled circuit breaker according to the measurement result and a reference parameter of the same type of filter bank circuit breaker.
Wherein, the test result includes: the overshoot difference between the arc contact and the main contact of the filter bank circuit breaker which is newly delivered from a factory, the average value of the dynamic contact resistance in the overshoot difference area and a dynamic contact resistance curve chart.
The fault diagnosis reference parameters comprise: the over-travel difference of an arc contact and a main contact of the filter bank circuit breaker, the average value of the dynamic contact resistance of an over-travel difference area and a dynamic contact resistance curve graph.
Wherein the fault type includes: contact-type faults and ablation-type faults.
Determining the electrical life of the commissioned filter bank circuit breaker or newly assembled circuit breaker, i.e. determining whether the arcing contacts need to record the filter bank circuit breaker or to overhaul the filter bank circuit breaker.
Wherein the determining the electrical life of the commissioned filter bank circuit breaker or newly assembled circuit breaker for the measurement results and reference parameters of the same model filter bank circuit breaker comprises:
when the fault type of the filter bank circuit breaker is determined to be a contact type fault,
if the average value of the dynamic contact resistance in the over-travel difference area is more than 20% of the reference parameter of the average value of the contact resistance in the fault diagnosis state, recording the filter bank circuit breaker;
if the average value of the dynamic contact resistance in the over-travel difference area is greater than 50% of the reference parameter of the average value of the contact resistance in the fault diagnosis state, the arc extinguish chamber where the filter bank circuit breaker is located is overhauled;
if the over travel difference of the arc contact and the main contact is more than 10% of the reference parameter of the over travel difference of the fault diagnosis arc contact and the main contact, the filter bank circuit breaker records;
and if the over travel difference between the arc contact and the main contact is more than 20 percent of the reference parameter of the over travel difference between the fault diagnosis arc contact and the main contact, the arc extinguish chamber where the filter bank circuit breaker is located is overhauled.
Wherein the determining the electrical life of the commissioned filter bank circuit breaker or newly assembled circuit breaker for the measurement results and reference parameters of the same model filter bank circuit breaker comprises:
when the fault type of the filter bank circuit breaker is determined to be ablation type fault,
if the average value of the dynamic contact resistance in the over-travel difference area is greater than 20% of the reference parameter of the average value of the dynamic contact resistance for fault diagnosis, recording the filter bank circuit breaker;
if the average value of the dynamic contact resistance in the over-range difference area is greater than 50% of the reference parameter of the average value of the dynamic contact resistance for fault diagnosis, the arc extinguish chamber where the filter bank circuit breaker is located is overhauled;
if the average value of the dynamic contact resistance in the over-travel difference area is larger than 100% of the reference parameter of the average value of the fault diagnosis dynamic contact resistance, replacing an arc contact for the filter bank circuit breaker;
if the over travel difference between the arc contact and the main contact is more than 20% of the reference parameter of the over travel difference between the fault diagnosis arc contact and the main contact, the filter bank circuit breaker records the over travel difference;
and if the over travel difference between the arc contact and the main contact is more than 40% of the reference parameter of the over travel difference between the fault diagnosis arc contact and the main contact, the arc contact is replaced for the filter bank circuit breaker.
Wherein, dynamic contact resistance curve test tests through circuit breaker dynamic contact resistance measurement system, circuit breaker dynamic contact resistance measurement system includes: a direct current power supply, a current sensor and a speed sensor;
the direct-current power supply is provided by a storage battery, the voltage of the storage battery is 12V, the internal resistance ri =1m omega, the lead wire resistance is 3m omega, the current sensor is a Hall current sensor, and the speed sensor is a rotary sensor;
the dynamic contact resistance curve test adopts dynamic contact resistance in the opening process of the filter bank circuit breaker as an analysis object;
and the loop current of the dynamic contact resistance measuring system of the circuit breaker is more than 1000A during the measurement of the dynamic contact resistance.
The invention is further illustrated by the following examples:
for the suspected arc contact type faults (arc contact centering bad, contact bad) of the circuit breaker, the evaluation method comprises the following steps:
1) And (3) carrying out dynamic contact resistance curve test on a new product of a certain type of circuit breaker, and recording the over-travel difference between the arc contact and the main contact and the average value of the dynamic contact resistance in an over-travel difference area.
2) The method comprises the steps of formulating a reference parameter for contact fault diagnosis of the arc contact of the circuit breaker based on dynamic contact resistance curve measurement through more than 10 test data and by combining with circuit breaker design parameters, wherein the reference parameter mainly comprises three aspects of the over-travel difference of the arc contact and a main contact of the circuit breaker, the average value of dynamic contact resistance in an over-travel difference area and a dynamic contact resistance curve graph.
3) And (3) measuring a dynamic contact resistance curve when the circuit breaker is put into operation and is subjected to power failure maintenance, measuring the over-travel difference between the arc contact and the main contact of the circuit breaker and the dynamic contact resistance average value of an over-travel difference region, and comparing the dynamic contact resistance average value with the arc contact fault diagnosis reference parameter:
(1) if the average value of the dynamic contact resistance in the over-travel difference area is more than 20% of the reference parameter, the circuit breaker needs to pay attention, the follow-up power failure maintenance measurement has the trend of continuously increasing, and the arc extinguish chamber needs to be maintained; and if the average value of the dynamic contact resistance in the over-range difference area is greater than 50% of the reference parameter, overhauling the arc extinguish chamber.
(2) If the over travel difference between the arc contact and the main contact is larger than 10% of the reference parameter, the circuit breaker needs to pay attention, and the subsequent power failure maintenance measurement has the tendency of continuous increase, and the arc extinguish chamber needs to be maintained; and if the over travel difference between the arc contact and the main contact is more than 20 percent of the reference parameter, the arc extinguish chamber is overhauled.
4) For a newly assembled circuit breaker, dynamic contact resistance curve measurement is carried out after the circuit breaker is assembled, and the over-travel difference between the arc contact and the main contact of the circuit breaker and the dynamic contact resistance average value of an over-travel difference area are measured and compared with the reference parameters for diagnosing the contact faults of the arc contact:
(1) if the average value of the dynamic contact resistance in the over-travel difference region is greater than 20% of the reference value, the circuit breaker needs to be reassembled with the arcing contacts.
(2) The arcing contacts are reassembled if the over travel difference between the arcing contacts and the main contact is greater than 30% of the reference.
(4) For the ablation-type faults (axial ablation and radial ablation) of the suspected arc contact of the circuit breaker, the evaluation method comprises the following steps:
1) And (3) carrying out dynamic contact resistance curve test on a newly-shipped product of a certain type of circuit breaker, and recording the over-travel difference between the arc contact and the main contact and the average value of the dynamic contact resistance in an over-travel difference area.
2) The method comprises the steps of formulating a reference parameter for contact fault diagnosis of the arc contact of the circuit breaker based on dynamic contact resistance curve measurement through more than 10 test data and by combining with circuit breaker design parameters, wherein the reference parameter mainly comprises three aspects of the over-travel difference of the arc contact and a main contact of the circuit breaker, the average value of dynamic contact resistance in an over-travel difference area and a dynamic contact resistance curve graph.
3) And (3) measuring a dynamic contact resistance curve when the circuit breaker is put into operation and is subjected to power failure maintenance, measuring the over travel difference between the arc contact and the main contact of the circuit breaker and the average value of the dynamic contact resistance in an over travel difference area, and comparing the average value with an ablation fault diagnosis reference parameter of the arc contact:
(1) if the average value of the dynamic contact resistance in the over-travel difference area is more than 20% of the reference parameter, the circuit breaker needs to pay attention, the follow-up power failure maintenance measurement has the trend of continuously increasing, and the arc extinguish chamber needs to be maintained; if the average value of the dynamic contact resistance in the over-travel difference area is greater than 50% of the reference parameter, the arc extinguishing chamber needs to be overhauled; and if the average value of the dynamic contact resistance in the over-travel difference area is greater than 100% of the reference parameter, the arc contact needs to be replaced.
(2) If the over travel difference between the arc contact and the main contact is more than 20% of the reference parameter, the circuit breaker needs to pay attention, and the subsequent power failure maintenance measurement has the tendency of continuous increase, and the arc extinguish chamber needs to be maintained; if the over travel difference between the arcing contact and the main contact is larger than 40% of the reference parameter, the arcing contact needs to be replaced.
110kV circuit breaker actual measurement
The dynamic contact resistance measurement was performed on the 110kV circuit breaker that completed 10000 mechanical life tests, and the measurement diagram thereof was compared with the new circuit breaker measurement diagram, as shown in fig. 5. According to the test results, the over travel difference of the circuit breaker arc contact and the main contact is changed from 15.1mm to 6mm after 10000 times of mechanical life tests are completed, the over travel difference is reduced by 60.3%, and the circuit breaker arc contact is replaced according to the contact fault diagnosis principle.
1000kV circuit breaker actual measurement
The looseness of the arc contact of the circuit breaker is one of the contact faults of the arc contact, which can cause the flashover fault inside an arc extinguish chamber of the circuit breaker, and the 1000kV GIS arc contact of a certain ultra-high voltage transformer substation causes flashover accidents due to the looseness of the arc contact. In order to test the checking effect of the dynamic contact resistance curve test on the loosening of the arc contact, the accident breaker is returned to a factory to simulate the loosening state of the arc contact. Artificially simulating 4 states of 1000kVGIS arc contact looseness, namely a fixed bolt fastening state of an arc contact base, a bolt torque reduction state of 107N m, a bolt torque reduction state of 47N m and a bolt looseness state. The measured dynamic contact resistance curves of the opening process in the 4 states are shown in fig. 6.
In a fastening state, the dynamic contact resistance curve of the arc contact is smooth, and the dynamic contact resistance value of an over-travel difference area is 805 mu omega; when the contact is in a loose state, the dynamic contact resistance is obviously increased compared with that in a tight state, the resistance value fluctuates for multiple times along with the change of the stroke, and the dynamic contact resistance value of an over-stroke difference area is increased from 805 mu omega in the tight state to 1608 mu omega in the loose state by about 1 time; the dynamic contact resistance of the arcing contact also fluctuates twice slightly when the torque of the arcing contact is 47Nm and 107Nm, and the dynamic contact resistance value of the over-travel difference region is 865 mu omega and 857 mu omega, which is also increased compared with the dynamic contact resistance value in the fastening state. Therefore, the dynamic contact resistance of the arc contact in several loose states is obviously different, the smaller the torque is, the larger the fluctuation of the dynamic contact resistance curve is, and the larger the dynamic contact resistance value in the over-travel difference region is. Therefore, the dynamic contact resistance is an effective method for analyzing the looseness of the arcing contact, and the looseness state of the arcing contact can be reflected.
The invention also proposes a system 200 for evaluating the electrical lifetime of a filter bank circuit breaker, as shown in fig. 7, comprising:
the testing module 201 is configured to perform a dynamic contact resistance curve test on a newly shipped filter bank circuit breaker to obtain a test result, and obtain design parameters of the newly shipped filter bank circuit breaker;
the reference parameter determining module 202 is used for determining a fault diagnosis reference parameter according to the test result and the design parameter;
the evaluation module 203 is used for determining the fault type of the commissioned filter bank circuit breaker or the newly assembled circuit breaker according to the commissioned filter bank circuit breaker or the newly assembled circuit breaker, then performing dynamic contact resistance curve measurement, obtaining a measurement result, and determining the electric life of the commissioned filter bank circuit breaker or the newly assembled circuit breaker according to the measurement result of the same model of filter bank circuit breaker and a reference parameter.
Wherein, the test result includes: the overshoot difference between the arc contact and the main contact of the filter bank circuit breaker which is newly delivered from a factory, the average value of the dynamic contact resistance in the overshoot difference area and a dynamic contact resistance curve chart.
The fault diagnosis reference parameters comprise: the over travel difference of an arc contact and a main contact of the filter bank circuit breaker, the average value of dynamic contact resistance in an over travel difference area and a dynamic contact resistance curve graph are obtained.
Wherein the fault type includes: contact-type faults and ablation-type faults.
Determining the fault type of the filter bank circuit breaker as a contact fault;
if the average value of the dynamic contact resistance in the over-travel difference area is greater than 20% of the reference parameter of the average value of the contact resistance in the fault diagnosis state, recording the filter bank circuit breaker;
if the average value of the dynamic contact resistance in the over-travel difference area is greater than 50% of the reference parameter of the average value of the contact resistance in the fault diagnosis state, the arc extinguish chamber where the filter bank circuit breaker is located is overhauled;
if the over travel difference between the arc contact and the main contact is more than 10% of the reference parameter of the over travel difference between the fault diagnosis arc contact and the main contact, the filter bank circuit breaker records the over travel difference;
and if the over travel difference between the arc contact and the main contact is more than 20 percent of the reference parameter of the over travel difference between the fault diagnosis arc contact and the main contact, the arc extinguish chamber where the filter bank circuit breaker is located is overhauled.
Wherein the determining of the electrical life of the commissioned filter bank circuit breaker or newly assembled circuit breaker for the measurement results and reference parameters of the same type of filter bank circuit breaker comprises:
determining the fault type of the filter bank circuit breaker as an ablation fault;
if the average value of the dynamic contact resistance in the over-travel difference area is more than 20% of the reference parameter of the average value of the dynamic contact resistance for fault diagnosis, recording the filter bank circuit breaker;
if the average value of the dynamic contact resistance in the over-range difference area is greater than 50% of the reference parameter of the average value of the dynamic contact resistance for fault diagnosis, the arc extinguish chamber where the filter bank circuit breaker is located is overhauled;
if the average value of the dynamic contact resistance in the over-travel difference area is larger than 100% of the reference parameter of the average value of the fault diagnosis dynamic contact resistance, replacing an arc contact for the filter bank circuit breaker;
if the over travel difference between the arc contact and the main contact is more than 20% of the reference parameter of the over travel difference between the fault diagnosis arc contact and the main contact, the filter bank circuit breaker records;
and if the over travel difference between the arc contact and the main contact is more than 40% of the reference parameter of the over travel difference between the fault diagnosis arc contact and the main contact, replacing the arc contact for the filter bank circuit breaker.
Wherein the determining the electrical life of the commissioned filter bank circuit breaker or newly assembled circuit breaker for the measurement results and reference parameters of the same model filter bank circuit breaker comprises:
dynamic contact resistance curve test tests through circuit breaker dynamic contact resistance measurement system, circuit breaker dynamic contact resistance measurement system includes: a direct current power supply, a current sensor and a speed sensor;
the direct-current power supply is provided by a storage battery, the voltage of the storage battery is 12V, the internal resistance ri =1m omega, the lead wire resistance is 3m omega, the current sensor is a Hall current sensor, and the speed sensor is a rotary sensor;
the dynamic contact resistance curve test adopts dynamic contact resistance in the opening process of the filter bank circuit breaker as an analysis object;
and the loop current of the dynamic contact resistance measuring system of the circuit breaker is more than 1000A during the measurement of the dynamic contact resistance.
The invention also proposes a computer-readable storage medium, which stores a computer program for executing the above-mentioned method of estimating the electrical lifetime of a filter bank circuit breaker.
The present invention also provides an electronic device, including:
a processor;
a memory for storing the processor-executable instructions;
the processor is used for reading the executable instructions from the memory and executing the instructions to realize the method for evaluating the electric service life of the filter bank circuit breaker.
The method solves the problem that the current filter bank circuit breaker is lack of pertinence and accuracy in electric life evaluation, and can provide a quantitative electric life evaluation strategy for common arc contact faults and arc contact ablation faults of the circuit breaker. The invention is provided based on the experimental research of a contact fault simulation prototype of the arc contact of the 110kV GIS circuit breaker and an ablation fault simulation prototype of the arc contact of the 220kV GIS circuit breaker, and is verified by the actual measurement results of the 110kV circuit breaker and the 1000kV circuit breaker. After the device is applied, the problems of long-term overhaul, excessive overhaul, advanced retirement and the like of the filter bank circuit breaker can be effectively avoided, good practical guidance is provided for time node selection needing overhaul work, material resources and manpower and financial resources are saved, meanwhile, the sudden on-off fault of the filter bank circuit breaker can be avoided, the safe and stable operation of a power system is guaranteed, and therefore huge social and economic benefits are generated. The method can provide theoretical guidance and engineering practice basis for future direct current transmission engineering construction or upgrading and reconstruction of the existing engineering in China.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the invention can be realized by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (16)
1. A method for evaluating filter bank circuit breaker electrical life, the method comprising:
the method comprises the steps that dynamic contact resistance curve testing is conducted on a newly-delivered filter bank circuit breaker to obtain a testing result, and design parameters of the newly-delivered filter bank circuit breaker are obtained;
determining a fault diagnosis reference parameter according to the test result and the design parameter;
the method comprises the steps of determining the fault type of a commissioned filter bank circuit breaker or a newly assembled circuit breaker according to the commissioned filter bank circuit breaker or the newly assembled circuit breaker, then carrying out dynamic contact resistance curve measurement, obtaining a measurement result, and determining the electric life of the commissioned filter bank circuit breaker or the newly assembled circuit breaker according to the measurement result and a reference parameter of the same type of filter bank circuit breaker.
2. The method of claim 1, the test results, comprising: the overshoot difference between the arc contact and the main contact of the filter bank circuit breaker which is newly delivered from a factory, the average value of the dynamic contact resistance in the overshoot difference area and a dynamic contact resistance curve chart.
3. The method of claim 1, said fault diagnosis reference, comprising: the over-travel difference of an arc contact and a main contact of the filter bank circuit breaker, the average value of the dynamic contact resistance of an over-travel difference area and a dynamic contact resistance curve graph.
4. The method of claim 1, the type of fault comprising: contact-type faults and ablation-type faults.
5. The method of claim 1, the determining an electrical life of the commissioned filter bank circuit breaker or newly assembled circuit breaker for measurements and reference quantities of a same model filter bank circuit breaker, comprising:
when the fault type of the filter bank circuit breaker is determined to be a contact type fault,
if the average value of the dynamic contact resistance in the over-travel difference area is greater than 20% of the reference parameter of the average value of the contact resistance in the fault diagnosis state, recording the filter bank circuit breaker;
if the average value of the dynamic contact resistance in the over-travel difference area is greater than 50% of the reference parameter of the average value of the contact resistance in the fault diagnosis state, the arc extinguish chamber where the filter bank circuit breaker is located is overhauled;
if the over travel difference of the arc contact and the main contact is more than 10% of the reference parameter of the over travel difference of the fault diagnosis arc contact and the main contact, the filter bank circuit breaker records;
and if the over travel difference between the arc contact and the main contact is more than 20 percent of the reference parameter of the over travel difference between the fault diagnosis arc contact and the main contact, the arc extinguish chamber where the filter bank circuit breaker is located is overhauled.
6. The method of claim 1, the determining an electrical life of the commissioned filter bank circuit breaker or newly assembled circuit breaker for measurements and reference quantities of a same model filter bank circuit breaker, comprising:
when the fault type of the filter bank circuit breaker is determined to be ablation type fault,
if the average value of the dynamic contact resistance in the over-travel difference area is more than 20% of the reference parameter of the average value of the dynamic contact resistance for fault diagnosis, recording the filter bank circuit breaker;
if the average value of the dynamic contact resistance in the over-range difference area is greater than 50% of the reference parameter of the average value of the fault diagnosis dynamic contact resistance, the arc extinguish chamber where the filter bank breaker is located is overhauled;
if the average value of the dynamic contact resistance in the over-travel difference area is larger than 100% of the reference parameter of the average value of the fault diagnosis dynamic contact resistance, replacing an arc contact for the filter bank circuit breaker;
if the over travel difference between the arc contact and the main contact is more than 20% of the reference parameter of the over travel difference between the fault diagnosis arc contact and the main contact, the filter bank circuit breaker records;
and if the over travel difference between the arc contact and the main contact is more than 40% of the reference parameter of the over travel difference between the fault diagnosis arc contact and the main contact, the arc contact is replaced for the filter bank circuit breaker.
7. The method of claim 1, wherein the dynamic contact resistance curve test is performed by a circuit breaker dynamic contact resistance measurement system comprising: a direct current power supply, a current sensor and a speed sensor;
the direct-current power supply is provided by a storage battery, the voltage of the storage battery is 12V, the internal resistance ri =1m omega, the lead wire resistance is 3m omega, the current sensor is a Hall current sensor, and the speed sensor is a rotary sensor;
the dynamic contact resistance curve test adopts dynamic contact resistance in the opening process of the filter bank circuit breaker as an analysis object;
and the loop current of the dynamic contact resistance measuring system of the circuit breaker is more than 1000A during the measurement of the dynamic contact resistance.
8. A system for evaluating filter bank circuit breaker electrical life, the system comprising:
the test module is used for carrying out dynamic contact resistance curve test on the filter bank circuit breaker which is newly delivered from the factory so as to obtain a test result and design parameters of the filter bank circuit breaker which is newly delivered from the factory;
the reference parameter determining module is used for determining fault diagnosis reference parameters according to the test result and the design parameters;
and the evaluation module is used for carrying out dynamic contact resistance curve measurement after determining the fault type of the commissioned filter bank circuit breaker or the newly assembled circuit breaker aiming at the commissioned filter bank circuit breaker or the newly assembled circuit breaker, acquiring a measurement result, and determining the electric life of the commissioned filter bank circuit breaker or the newly assembled circuit breaker aiming at the measurement result and a reference parameter of the same model of filter bank circuit breaker.
9. The system of claim 8, the test results comprising: the overshoot of the arc contact and the main contact of the filter bank circuit breaker which is newly delivered from a factory, the average value of the dynamic contact resistance in the overshoot area and a dynamic contact resistance curve chart are obtained.
10. The system of claim 8, said fault diagnosis reference comprising: the over-travel difference of an arc contact and a main contact of the filter bank circuit breaker, the average value of the dynamic contact resistance of an over-travel difference area and a dynamic contact resistance curve graph.
11. The system of claim 8, the type of fault comprising: contact-type faults and ablation-type faults.
12. The system of claim 8, the determining an electrical life of the commissioned filter bank circuit breaker or newly assembled circuit breaker for measurements and reference quantities of a same model filter bank circuit breaker, comprising:
when the fault type of the filter bank circuit breaker is determined to be a contact fault;
if the average value of the dynamic contact resistance in the over-travel difference area is more than 20% of the reference parameter of the average value of the contact resistance in the fault diagnosis state, recording the filter bank circuit breaker;
if the average value of the dynamic contact resistance in the over-range difference area is greater than 50% of the reference parameter of the average value of the contact resistance in the fault diagnosis state, the arc extinguish chamber where the filter bank breaker is located is overhauled;
if the over travel difference of the arc contact and the main contact is more than 10% of the reference parameter of the over travel difference of the fault diagnosis arc contact and the main contact, the filter bank circuit breaker records;
and if the over travel difference between the arc contact and the main contact is more than 20 percent of the reference parameter of the over travel difference between the fault diagnosis arc contact and the main contact, the arc extinguish chamber where the filter bank circuit breaker is located is overhauled.
13. The system of claim 8, the determining an electrical life of the commissioned filter bank circuit breaker or newly assembled circuit breaker for measurements and reference quantities of a same model filter bank circuit breaker, comprising:
when the fault type of the filter bank circuit breaker is determined to be ablation type fault;
if the average value of the dynamic contact resistance in the over-travel difference area is greater than 20% of the reference parameter of the average value of the dynamic contact resistance for fault diagnosis, recording the filter bank circuit breaker;
if the average value of the dynamic contact resistance in the over-range difference area is greater than 50% of the reference parameter of the average value of the dynamic contact resistance for fault diagnosis, the arc extinguish chamber where the filter bank circuit breaker is located is overhauled;
if the average value of the dynamic contact resistance in the over-travel difference area is larger than 100% of the reference parameter of the average value of the fault diagnosis dynamic contact resistance, replacing an arc contact for the filter bank circuit breaker;
if the over travel difference between the arc contact and the main contact is more than 20% of the reference parameter of the over travel difference between the fault diagnosis arc contact and the main contact, the filter bank circuit breaker records;
and if the over travel difference between the arc contact and the main contact is more than 40% of the reference parameter of the over travel difference between the fault diagnosis arc contact and the main contact, replacing the arc contact for the filter bank circuit breaker.
14. The system of claim 8, wherein the dynamic contact resistance curve test is performed by a circuit breaker dynamic contact resistance measurement system, the circuit breaker dynamic contact resistance measurement system comprising: a direct current power supply, a current sensor and a speed sensor;
the direct-current power supply is provided by a storage battery, the voltage of the storage battery is 12V, the internal resistance ri =1m omega, the lead wire resistance is 3m omega, the current sensor is a Hall current sensor, and the speed sensor is a rotary sensor;
the dynamic contact resistance curve test adopts dynamic contact resistance in the opening process of the filter bank circuit breaker as an analysis object;
and the loop current of the dynamic contact resistance measuring system of the circuit breaker is more than 1000A during the measurement of the dynamic contact resistance.
15. A computer-readable storage medium, in which a computer program is stored, which computer program is adapted to carry out the method of evaluating the electrical lifetime of a filter bank circuit breaker according to any of the preceding claims 1-7.
16. An electronic device, the electronic device comprising:
a processor;
a memory for storing the processor-executable instructions;
the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method for estimating the electrical lifetime of a filter bank circuit breaker according to any one of the preceding claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111562824.4A CN115308581A (en) | 2021-12-20 | 2021-12-20 | Method and system for evaluating electric service life of filter bank circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111562824.4A CN115308581A (en) | 2021-12-20 | 2021-12-20 | Method and system for evaluating electric service life of filter bank circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115308581A true CN115308581A (en) | 2022-11-08 |
Family
ID=83853422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111562824.4A Pending CN115308581A (en) | 2021-12-20 | 2021-12-20 | Method and system for evaluating electric service life of filter bank circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115308581A (en) |
-
2021
- 2021-12-20 CN CN202111562824.4A patent/CN115308581A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Jahromi et al. | An approach to power transformer asset management using health index | |
| CN108549047A (en) | A kind of electric energy meter lifetime estimation method based on accelerated degradation test | |
| CN110456299B (en) | On-line detection method for turn-to-turn short circuit fault of secondary winding of current transformer | |
| CN103093110A (en) | Method for detecting factors influencing mechanical life of support porcelain insulator | |
| CN110568301B (en) | Detection mode prejudging method based on effective detection rate of transformer state quantity | |
| US20130187389A1 (en) | Method for predictive monitoring of switch contactors and system therefor | |
| CN113758604B (en) | Method, device, equipment and storage medium for detecting running state of electrical equipment | |
| KR102597250B1 (en) | Method for evaluating lifetime of extra high voltage electric cable | |
| CN117936949A (en) | Rapid intelligent detection maintenance system for new energy automobile battery pack | |
| CN109615093A (en) | Repair of Transformer mode determines method and device | |
| CN112881877A (en) | Method and system for evaluating high-voltage insulation aging state | |
| CN113515842A (en) | Large-scale generator service life assessment method and system | |
| CN115308581A (en) | Method and system for evaluating electric service life of filter bank circuit breaker | |
| Cichecki et al. | Statistical approach in power cables diagnostic data analysis | |
| CN116840614A (en) | Cable line defect sensing and early warning method based on harmonic fluctuation characteristics | |
| CN116539759A (en) | Accelerated degradation test method and device for insulating oil dissolved gas on-line monitoring equipment | |
| Dmitriev et al. | Fuzzy dynamic model of power equipment state assessment | |
| Steed | Condition monitoring applied to power transformers-an REC experience | |
| Cliteur et al. | Condition assessment of power transmission and distribution components | |
| Lybeck et al. | Online monitoring technical basis and analysis framework for large power transformers; Interim report for FY 2012 | |
| Abdullah et al. | Prediction of Transformer Health Index Using Condition Situation Monitoring (CSM) Diagnostic Techniques | |
| Rux | High-voltage dc tests for evaluating stator winding insulation: Uniform step, graded step, and ramped test methods | |
| Mladenovic et al. | Determination of the Characteristic Life Time of Paper-insulated MV-Cables based on a Partial Discharge and tan (δ) Diagnosis | |
| Nazarychev et al. | The Inspection of the Technical State of Critical Infrastructure Facilities | |
| Sharma et al. | Smart Techniques for Fault Diagnosis in Power Transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |