CN116466225A - Early warning method for circuit resistance of circuit breaker - Google Patents
Early warning method for circuit resistance of circuit breaker Download PDFInfo
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- CN116466225A CN116466225A CN202310448774.XA CN202310448774A CN116466225A CN 116466225 A CN116466225 A CN 116466225A CN 202310448774 A CN202310448774 A CN 202310448774A CN 116466225 A CN116466225 A CN 116466225A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000000523 sample Substances 0.000 claims abstract description 29
- 238000009413 insulation Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 4
- 230000005856 abnormality Effects 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 abstract description 7
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000005070 sampling Methods 0.000 description 10
- 238000005259 measurement Methods 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/185—Electrical failure alarms
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention discloses a circuit breaker loop resistance early warning method, which adopts a non-contact voltage probe and a current probe to collect voltage and current at two ends of a circuit breaker, so that the problem that the circuit breaker loop resistance is abnormal, such as that the circuit breaker cannot be closed in place, can not be found in time in off-line test is avoided; the general early warning and the serious early warning of the circuit breaker are set, the general early warning selects the machine to exit for maintenance, the serious early warning exits the maintenance in time, and various states of the circuit breaker can be controlled in a grasping and grading manner; setting general early warning and serious early warning for the early warning value of the circuit breaker so as to ensure that the circuit breaker can perform early warning in time whenever any phase has a problem; the problem that the existing offline measuring method cannot reflect the circuit resistance of the circuit breaker in real time is solved, and the state of the circuit breaker is monitored in a real-time and online mode; the problem that the existing measuring method can not give an alarm in time when the loop resistance is abnormal in the running state of the circuit breaker can be solved.
Description
Technical Field
The invention relates to the technical field of early warning of circuit breakers, in particular to a circuit breaker loop resistance early warning method.
Background
The circuit breaker is used as a switching device capable of breaking large-amplitude current and having excellent arc extinguishing function, and comprises an arc contact, a main contact, an arc extinguishing chamber and other electrical units, and a complex mechanical transmission mechanism, wherein the circuit breaker is possibly damaged due to the fact that any part is in a problem. In the case of a contact of a circuit breaker, the contact is deformed, worn or burned due to a high temperature generated when the contact is subjected to a large current. The circuit breaker is in abnormal operation due to the fact that the contact is not closed in place and the loop resistance is increased when the circuit breaker acts for a long time, so that the state of the circuit breaker at the outlet of the generator needs to be monitored in time by on-line measurement of the loop resistance of the circuit breaker, and timely alarm is given when the loop resistance of the circuit breaker is abnormal.
At present, most of the measuring modes of loop resistance are a series of off-line testing methods based on loop current testers, and the methods have unavoidable defects due to the need of externally adding the loop current testers; it mainly exhibits three aspects:
1, the measuring methods are all carried out when the circuit breaker is in a power failure state, each measurement is carried out at a certain time point, and real-time measurement cannot be carried out on line, if the circuit breaker is easy to be closed in place, the off-line measuring method cannot judge, and the circuit resistance of the circuit breaker in the continuous operation time of one year or a plurality of years cannot be measured, so that the state of the circuit breaker is comprehensively estimated;
2, in the existing measuring method, each measurement is influenced by the magnitude of current applied by an instrument, different results are obtained by different equipment, and the circuit resistance change trend of the circuit breaker cannot be accurately judged;
3, the existing offline measuring method also has measuring errors caused by the temperature rise effect generated by clamping the wire under high current and measuring errors caused by abrasion of the wire in the process of repeated measurement; in summary, the existing measuring method cannot accurately measure the circuit resistance of the circuit breaker on line and early warn when the circuit resistance is abnormal in the running state of the circuit breaker; therefore, it is necessary to design a circuit breaker loop resistance early warning method to solve the above problems.
Disclosure of Invention
The invention aims to provide a circuit resistance early warning method of a circuit breaker, which can not only measure the circuit resistance of the circuit breaker in real time and on line after the circuit breaker acts and normally operates, but also solve the problem that the existing off-line measuring method can not reflect the circuit resistance of the circuit breaker in real time and monitor the state of the circuit breaker in a real-time and on-line mode; the invention also solves the problem that the existing measuring method can not give an alarm in time when the loop resistance is abnormal in the running state of the circuit breaker.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a circuit breaker loop resistance early warning method comprises the following steps:
s1, collecting voltage on one side of a contact of a circuit breaker:
voltage probes are respectively arranged on one side three phases of a circuit breaker contact, and are arranged on a circuit breaker component in a non-contact mode to collect voltage on a circuit breaker loop; the group of voltage probes collect the voltage at one side of the contact of the circuit breaker, and the three phases are V respectively A1 、V B1 、V C1 ；
S2, collecting the contact current of the circuit breaker:
the method comprises the steps that current probes are respectively arranged on one side three phases of a circuit breaker contact, and are arranged on a circuit breaker component in a non-contact mode to collect current on a circuit breaker; the group of current probes collect the current of the circuit breaker, and three phases are I respectively A 、I B 、I C ；
S3, collecting voltage at the other side of the contact of the circuit breaker:
the other side three phases of the breaker contact are respectively provided with a voltage probe which is arranged on the related components of the breaker in a non-contact way and is used for supplying electricity to a circuit of the breakerThe voltage is collected without affecting the insulation of the circuit breaker, the voltage at the other side of the circuit breaker contact can be collected at the moment, and three phases are V respectively A2 、V B2 、V C2 ；
S4, calculating the loop resistance of the circuit breaker according to the acquired data of the voltage and current probes:
phase A:
and B phase:
and C phase:
when the circuit resistance of the breaker is normal, the three-phase circuit resistance is set as R A0 、R B0 、R C0 ；
S5, early warning is carried out, wherein the early warning comprises general early warning and serious early warning:
s501, general early warning, namely, the machine is selected to exit the circuit breaker, the circuit breaker is checked and overhauled, and the alarm condition is set for the loop resistance measured before the circuit breaker:
|R A -R A0 |∪|R B -R B0 |∪|R C -R C0 |>10％
or: r is% A -R B |∪|R B -R C |∪|R C -R A |>10％；
S502, seriously early warning, immediately exiting the circuit breaker, checking and overhauling the circuit breaker, and setting an alarm condition for the loop resistance measured by the circuit breaker at the moment;
|R A -R A0 |∪|R B -R B0 |∪|R C -R C0 |>30％
or: r is% A -R B |∪|R B -R C |∪|R C -R A |>30％；
S6, judging the real-time state of the circuit breaker according to the real-time calculation result, and giving out corresponding signals according to the judgment result; the actual conditions such as field fault experience of the circuit breaker are combined, calculation is carried out on the circuit breaker after the switching-on action of the circuit breaker by taking 1s as a time interval, the equipment state is continuously judged for 10min, and an equipment state early warning signal is given; and after the breaker is switched on for 10min, calculating at a time interval of 1 min, judging whether abnormality occurs or not, and giving out a corresponding early warning signal.
Preferably, in step S6, corresponding signals including a normal signal, a general early warning signal and a serious early warning signal are given according to the determination result.
Furthermore, the three steps of the step S1, the step S2 and the step S3 can be adjusted according to the actual condition of the site, and the sequence can be changed more.
Further, the setting of the early warning value in the step S5 is set by combining actual experiences of the field faults of the circuit breaker and the like without losing generality, and is set to be 10% and 30% of two-point values beyond the normal value; in actual use, the field can be modified according to the historical state of the circuit breaker, the state of the same family equipment and the like, and the value of the field can be modified.
Further, setting sampling time in the step S6, namely setting the sampling time interval to be 1S after the circuit breaker is switched on, and setting the sampling time to be 1 minute after the circuit breaker is switched on for 10 minutes; the field may be modified based on the historical state of the circuit breaker, the state of the peer devices, etc., and the values may be modified.
The invention has the following beneficial effects:
the method comprises the steps that 1, voltage and current at two ends of a circuit breaker are collected in a non-contact voltage probe and current probe mode, so that the influence on the insulation of the circuit breaker can be reduced to the greatest extent, the original insulation of the circuit breaker is not damaged, and the insulation of the circuit breaker is not influenced by additional equipment;
2, the circuit breaker is subjected to real-time online voltage and current measurement in a non-contact voltage probe and current probe mode, the state of the circuit breaker is timely judged, and the problem that the circuit breaker loop resistance is abnormal due to the fact that the off-line test cannot timely find out that the circuit breaker is not closed in place is avoided;
3, setting general early warning and serious early warning of the circuit breaker, wherein the general early warning needs to be carried out by selecting a machine to exit for maintenance, and the serious early warning needs to be carried out by exiting for maintenance in time, so that various states of the circuit breaker can be controlled in a grasping and grading manner;
4, setting the early warning value of the circuit breaker, wherein the normal early warning value is set to be 10% beyond the normal value, the serious early warning value is set to be 30% beyond the normal value, and the comparison of specific values of the circuit breaker is not only needed to be compared with in-phase historical normal data, but also needed to be compared with data at different phases and at the same moment so as to ensure that the circuit breaker can perform timely early warning at any time when any phase has a problem;
5, setting sampling time to be 1s for 10min after the switching-on action of the circuit breaker without losing generality and combining actual conditions such as field fault experience of the circuit breaker; after the breaker is switched on for 10min, the sampling time is set to be 1 min, so that the high sampling frequency of the moment when faults are easy to occur and the low sampling frequency of the moment when the faults are difficult to occur can be achieved, the working frequency of the probe is reduced, the using time of the probe is prolonged, and the maintenance cost is reduced.
Drawings
FIG. 1 is a schematic diagram of the installation positions of various voltage and current probes of an intermediate circuit breaker of the present invention;
fig. 2 is a flow chart of the method of the present invention.
Detailed Description
As shown in fig. 1-2, a circuit breaker loop resistance early warning method comprises the following steps:
s1, collecting voltage on one side of a contact of a circuit breaker:
voltage probes are respectively arranged on one side three phases of a circuit breaker contact, and are arranged on a circuit breaker component in a non-contact mode to collect voltage on a circuit breaker loop; the group of voltage probes collect the voltage at one side of the contact of the circuit breaker, and the three phases are V respectively A1 、V B1 、V C1 ；
S2, collecting the contact current of the circuit breaker:
three phases are respectively arranged on one side of a breaker contactThe current probe is arranged on a breaker component in a non-contact way and is used for collecting current on a circuit of the breaker; the group of current probes collect the current of the circuit breaker, and three phases are I respectively A 、I B 、I C ；
S3, collecting voltage at the other side of the contact of the circuit breaker:
the voltage probes are respectively arranged on the other side three phases of the circuit breaker contact, the voltage probes are arranged on related components of the circuit breaker in a non-contact mode, voltage on a circuit of the circuit breaker is collected, insulation of the circuit breaker cannot be affected, at the moment, the voltage on the other side of the circuit breaker contact can be collected, and the three phases are V respectively A2 、V B2 、V C2 ；
S4, calculating the loop resistance of the circuit breaker according to the acquired data of the voltage and current probes:
phase A:
and B phase:
and C phase:
when the circuit resistance of the breaker is normal, the three-phase circuit resistance is set as R A0 、R B0 、R C0 ；
S5, early warning is carried out, wherein the early warning comprises general early warning and serious early warning:
s501, general early warning, namely, the machine is selected to exit the circuit breaker, the circuit breaker is checked and overhauled, and the alarm condition is set for the loop resistance measured before the circuit breaker:
|R A -R A0 |∪|R B -R B0 |∪|R C -R C0 |>10％
or: r is% A -R B |∪|R B -R C |∪|R C -R A |>10％；
S502, seriously early warning, immediately exiting the circuit breaker, checking and overhauling the circuit breaker, and setting an alarm condition for the loop resistance measured by the circuit breaker at the moment;
|R A -R A0 |∪|R B -R B0 |∪|R C -R C0 |>30％
or: r is% A -R B |∪|R B -R C |∪|R C -R A |>30％；
S6, judging the real-time state of the circuit breaker according to the real-time calculation result, and giving out corresponding signals according to the judgment result; the actual conditions such as field fault experience of the circuit breaker are combined, calculation is carried out on the circuit breaker after the switching-on action of the circuit breaker by taking 1s as a time interval, the equipment state is continuously judged for 10min, and an equipment state early warning signal is given; and after the breaker is switched on for 10min, calculating at a time interval of 1 min, judging whether abnormality occurs or not, and giving out a corresponding early warning signal.
Preferably, in step S6, corresponding signals including a normal signal, a general early warning signal and a serious early warning signal are given according to the determination result.
Furthermore, the three steps of the step S1, the step S2 and the step S3 can be adjusted according to the actual condition of the site, and the sequence can be changed more.
Further, the setting of the early warning value in the step S5 is set by combining actual experiences of the field faults of the circuit breaker and the like without losing generality, and is set to be 10% and 30% of two-point values beyond the normal value; in actual use, the field can be modified according to the historical state of the circuit breaker, the state of the same family equipment and the like, and the value of the field can be modified.
Further, setting sampling time in the step S6, namely setting the sampling time interval to be 1S after the circuit breaker is switched on, and setting the sampling time to be 1 minute after the circuit breaker is switched on for 10 minutes; the field may be modified based on the historical state of the circuit breaker, the state of the peer devices, etc., and the values may be modified.
The foregoing embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without collision. The protection scope of the present invention is defined by the claims, and the protection scope includes equivalent alternatives to the technical features of the claims. I.e., equivalent replacement modifications within the scope of this invention are also within the scope of the invention.
Claims (2)
1. The circuit resistance early warning method of the circuit breaker is characterized by comprising the following steps of:
s1, collecting voltage on one side of a contact of a circuit breaker:
voltage probes are respectively arranged on one side three phases of a circuit breaker contact, and are arranged on a circuit breaker component in a non-contact mode to collect voltage on a circuit breaker loop; the group of voltage probes collect the voltage at one side of the contact of the circuit breaker, and the three phases are V respectively A1 、V B1 、V C1 ；
S2, collecting the contact current of the circuit breaker:
the method comprises the steps that current probes are respectively arranged on one side three phases of a circuit breaker contact, and are arranged on a circuit breaker component in a non-contact mode to collect current on a circuit breaker; the group of current probes collect the current of the circuit breaker, and three phases are I respectively A 、I B 、I C ；
S3, collecting voltage at the other side of the contact of the circuit breaker:
the voltage probes are respectively arranged on the other side three phases of the circuit breaker contact, the voltage probes are arranged on related components of the circuit breaker in a non-contact mode, voltage on a circuit of the circuit breaker is collected, insulation of the circuit breaker cannot be affected, at the moment, the voltage on the other side of the circuit breaker contact can be collected, and the three phases are V respectively A2 、V B2 、V C2 ；
S4, calculating the loop resistance of the circuit breaker according to the acquired data of the voltage and current probes:
phase A:
and B phase:
and C phase:
when the circuit resistance of the breaker is normal, the three-phase circuit resistance is set as R A0 、R B0 、R C0 ；
S5, early warning is carried out, wherein the early warning comprises general early warning and serious early warning:
s501, general early warning, namely, the machine is selected to exit the circuit breaker, the circuit breaker is checked and overhauled, and the alarm condition is set for the loop resistance measured before the circuit breaker:
|R A -R A0 |∪|R B -R B0 |∪|R C -R C0 |>10％
or: r is% A -R B |∪|R B -R C |∪|R C -R A |>10％；
S502, seriously early warning, immediately exiting the circuit breaker, checking and overhauling the circuit breaker, and setting an alarm condition for the loop resistance measured by the circuit breaker at the moment;
|R A -R A0 |∪|R B -R B0 |∪|R C -R C0 |>30％
or: r is% A -R B |∪|R B -R C |∪|R C -R A |>30％；
S6, judging the real-time state of the circuit breaker according to the real-time calculation result, and giving out corresponding signals according to the judgment result; the actual conditions such as field fault experience of the circuit breaker are combined, calculation is carried out on the circuit breaker after the switching-on action of the circuit breaker by taking 1s as a time interval, the equipment state is continuously judged for 10min, and an equipment state early warning signal is given; and after the breaker is switched on for 10min, calculating at a time interval of 1 min, judging whether abnormality occurs or not, and giving out a corresponding early warning signal.
2. The circuit breaker loop resistance early warning method according to claim 1, wherein: in step S6, corresponding signals including normal signals, general early warning signals and serious early warning signals are given according to the judging result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310448774.XA CN116466225A (en) | 2023-04-24 | 2023-04-24 | Early warning method for circuit resistance of circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310448774.XA CN116466225A (en) | 2023-04-24 | 2023-04-24 | Early warning method for circuit resistance of circuit breaker |
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| Publication Number | Publication Date |
|---|---|
| CN116466225A true CN116466225A (en) | 2023-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310448774.XA Pending CN116466225A (en) | 2023-04-24 | 2023-04-24 | Early warning method for circuit resistance of circuit breaker |
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| Country | Link |
|---|---|
| CN (1) | CN116466225A (en) |
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2023
- 2023-04-24 CN CN202310448774.XA patent/CN116466225A/en active Pending
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