CN112731123A - Method and device for detecting and evaluating performance of circuit breaker mechanism - Google Patents
Method and device for detecting and evaluating performance of circuit breaker mechanism Download PDFInfo
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- CN112731123A CN112731123A CN202011337454.XA CN202011337454A CN112731123A CN 112731123 A CN112731123 A CN 112731123A CN 202011337454 A CN202011337454 A CN 202011337454A CN 112731123 A CN112731123 A CN 112731123A
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- 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
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Abstract
The invention discloses a method and a device for detecting and evaluating the performance of a circuit breaker mechanism, wherein the method comprises the following steps: coil turn-to-turn short circuit conditions of different degrees are obtained by measuring the direct current resistance value of the coil; obtaining the change condition of the gap of the circuit breaker mechanism by measuring the mechanical characteristics of the circuit breaker mechanism; the jamming condition of the iron core is obtained by measuring the current of the coil; the blocking situation of the breaker mechanism is obtained by measuring the opening and closing speeds; and evaluating the performance of the circuit breaker mechanism based on the coil turn-to-turn short circuit condition, the circuit breaker mechanism gap change condition, the iron core jamming condition and the circuit breaker mechanism jamming condition of different degrees. In the implementation of the invention, the maintainability of the breaker mechanism can be evaluated, so that the breaker mechanism with high performance can be effectively selected.
Description
Technical Field
The invention relates to the technical field of circuit breaker transformation equipment, in particular to a method and a device for detecting and evaluating the performance of a circuit breaker mechanism.
Background
The circuit breaker is important protection equipment of a power grid, is widely applied to various substations, has more parts compared with other electrical equipment, and has relatively frequent actions, so that the possibility of generating faults is higher; for a long time, the reliability of the circuit breaker mechanism is always the focus of the attention of a power grid operation unit, and the statistical data of actual operation shows that the performance of the circuit breaker mechanism is improved, so that the circuit breaker mechanism has important significance for the safe and reliable operation of the circuit breaker, because the faults caused by the circuit breaker mechanism account for more than half of the total number; the performance of the circuit breaker mechanism is on one hand represented in reliability, and the higher the reliability of the circuit breaker mechanism is, the lower the probability of failure is; on the other hand, the better the maintainability of the breaker mechanism is, the easier the defects of the breaker mechanism are found, and the lower the probability of failure is; most of the current researches are concentrated on the reliability of the circuit breaker mechanism, the overhauling research on the circuit breaker mechanism is few, and the defects of the circuit breaker mechanism cannot be easily found, so that the probability of faults is reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method and a device for detecting and evaluating the performance of a circuit breaker mechanism, which can evaluate the overhauling performance of the circuit breaker mechanism, so that the circuit breaker mechanism with high performance can be effectively selected.
In order to solve the above technical problem, an embodiment of the present invention provides a method for detecting and evaluating the performance of a circuit breaker mechanism, where the method includes:
winding opening and closing coils with different turns on the circuit breaker mechanism, and obtaining turn-to-turn short circuit conditions of the coils with different degrees by measuring direct current resistance values of the coils;
adjusting the gap and the stroke of an iron core of the opening and closing coil on the circuit breaker mechanism, and measuring the mechanical characteristics of the circuit breaker mechanism to obtain the gap change condition of the circuit breaker mechanism;
applying resistance on the iron core of the opening and closing coil on the circuit breaker mechanism, and measuring the current of the coil to obtain the jamming condition of the iron core;
adjusting the circuit breaker mechanism to act on a switch-off and switch-on speed boundary, and measuring the switch-off and switch-on speeds to obtain the blocking condition of the circuit breaker mechanism;
and evaluating the performance of the circuit breaker mechanism based on the coil turn-to-turn short circuit conditions of different degrees, and/or the gap variation condition of the circuit breaker mechanism, and/or the iron core jamming condition, and/or the circuit breaker mechanism jamming condition.
Optionally, winding the divide-shut brake coil of different turns on circuit breaker mechanism includes:
winding a switching-on and switching-off coil with the ratio of the number of turns of the coil to the number of original turns being a first preset value on a circuit breaker mechanism;
winding a switching-on and switching-off coil with the ratio of the number of turns of the coil to the number of original turns being a second preset value on the circuit breaker mechanism;
winding a switching-on and switching-off coil with the ratio of the number of turns of the coil to the original number of turns being a third preset value on the circuit breaker mechanism;
and winding the opening and closing coil with the ratio of the number of turns of the coil to the original number of turns being a fourth preset value on the circuit breaker mechanism.
Optionally, the first preset value, the second preset value, the third preset value and the fourth preset value are sequentially decreased by 5%.
Optionally, the obtaining of the coil turn-to-turn short circuit conditions of different degrees by measuring the coil direct current resistance value includes:
measuring the direct current resistance value of the same coil at different temperatures to obtain the direct current resistance temperature coefficient of the coil;
normalizing the boundary resistance value and the direct current resistance value to the environmental temperature based on the direct current resistance temperature coefficient of the coil to obtain a corrected direct current resistance value;
and obtaining the turn-to-turn short circuit conditions of the coils in different degrees based on the corrected direct current resistance value.
Optionally, the adjustment the clearance and the stroke of the iron core of the opening and closing coil on the circuit breaker mechanism include: and the gap and the stroke of the iron core of the opening and closing coil on the circuit breaker mechanism are enlarged or reduced by adjusting the bolt and the nut of the iron core of the opening and closing coil.
Optionally, the applying resistance to the iron core of the opening and closing coil on the circuit breaker mechanism includes: and a spring is arranged on the iron core of the opening and closing coil on the circuit breaker mechanism, and the magnitude of resistance is controlled by controlling the compression amount of the spring.
Optionally, the obtaining of the iron core jamming condition by measuring the coil current includes:
obtaining coil current curve characteristics by measuring coil current, and obtaining an internal state variable of an iron core in a jamming state by measuring a resistance load;
and obtaining the jamming condition of the iron core based on the current curve characteristics of the coil.
Optionally, the coil current profile is characterized by the time from when the coil is energized to when the coil profile first reaches a trough.
Optionally, the adjusting the circuit breaker mechanism to perform an action on the boundary between the switching speed and the closing speed includes:
adjusting the upper boundary of the breaker mechanism at the opening speed and the upper boundary of the closing speed for n times;
adjusting the upper boundary of the opening speed and the lower boundary of the closing speed of the breaker mechanism for n times;
adjusting the lower boundary of the switching-off speed and the upper boundary of the switching-on speed of the circuit breaker mechanism for n times;
and adjusting the lower boundary of the breaker mechanism at the opening speed and the lower boundary of the closing speed for n times.
In addition, the embodiment of the invention also provides a device for detecting and evaluating the performance of the circuit breaker mechanism, which comprises:
coil turn-to-turn short circuit condition acquisition module: the circuit breaker mechanism is used for winding opening and closing coils with different turns on the circuit breaker mechanism and obtaining turn-to-turn short circuit conditions of the coils with different degrees by measuring the direct current resistance value of the coils;
mechanism clearance change condition acquisition module: the circuit breaker mechanism is used for adjusting the gap and the stroke of an iron core of the opening and closing coil on the circuit breaker mechanism and obtaining the gap change condition of the circuit breaker mechanism by measuring the mechanical characteristics of the circuit breaker mechanism;
the iron core jam condition acquisition module: the resistance is applied to the iron core of the opening and closing coil on the circuit breaker mechanism, and the jamming condition of the iron core is obtained by measuring the current of the coil;
mechanism jam condition acquisition module: the circuit breaker mechanism is used for adjusting the circuit breaker mechanism to act on a switch-off and switch-on speed boundary, and the blocking condition of the circuit breaker mechanism is obtained by measuring the switch-off and switch-on speeds;
an evaluation module: and the circuit breaker mechanism performance evaluation module is used for evaluating the circuit breaker mechanism performance based on the coil turn-to-turn short circuit conditions of different degrees, and/or the gap variation condition of the circuit breaker mechanism, and/or the iron core jamming condition, and/or the circuit breaker mechanism jamming condition.
In the implementation of the invention, the performance of the circuit breaker mechanism is detected and evaluated based on four aspects of the coil turn-to-turn short circuit condition, the gap change condition of the circuit breaker mechanism, the iron core jamming condition and the circuit breaker mechanism jamming condition, the maintainability and the reliability of the circuit breaker mechanism can be quantitatively evaluated, the method can be practically applied to the identification of the quality of the circuit breaker and the management and control of the quality of the network-connected circuit breaker mechanism, has important significance for reducing the faults of the circuit breaker mechanism, and can effectively select the high-performance circuit breaker mechanism.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow diagram of a method of circuit breaker mechanism performance detection and evaluation in an embodiment of the invention;
fig. 2 is a schematic structural composition diagram of an apparatus for detecting and evaluating the performance of a circuit breaker mechanism in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a method for detecting and evaluating the performance of a circuit breaker mechanism according to an embodiment of the invention.
As shown in fig. 1, a method for detecting and evaluating the performance of a circuit breaker mechanism includes:
s11: winding opening and closing coils with different turns on the circuit breaker mechanism, and obtaining turn-to-turn short circuit conditions of the coils with different degrees by measuring direct current resistance values of the coils;
in the specific implementation process of the invention, the winding of the opening and closing coils with different turns on the circuit breaker mechanism comprises the following steps: winding a switching-on and switching-off coil with the ratio of the number of turns of the coil to the number of original turns being a first preset value on a circuit breaker mechanism; winding a switching-on and switching-off coil with the ratio of the number of turns of the coil to the number of original turns being a second preset value on the circuit breaker mechanism; winding a switching-on and switching-off coil with the ratio of the number of turns of the coil to the original number of turns being a third preset value on the circuit breaker mechanism; and winding the opening and closing coil with the ratio of the number of turns of the coil to the original number of turns being a fourth preset value on the circuit breaker mechanism. It should be noted that the first preset value, the second preset value, the third preset value and the fourth preset value are sequentially decreased by 5%, in the embodiment of the present invention, the first preset value is 95%, the second preset value is 90%, the third preset value is 85% and the fourth preset value is 80%.
Specifically, the turn-to-turn short circuit condition of the coil is simulated by winding coils with different turns, the ratio of the number of turns of the coil to the original number of turns is gradually reduced by 5% for winding, namely 95%, 90%, 85% and 80% … … respectively, until the circuit breaker mechanism can not normally act or the action characteristic does not meet the technical specification requirement, the turn-to-turn boundary of the coil is obtained, and the direct current resistance of the coil is measured to obtain the resistance change boundary of the coil.
In the specific implementation process of the present invention, the obtaining of the turn-to-turn short circuit conditions of the coils of different degrees by measuring the dc resistance values of the coils includes: measuring the direct current resistance value of the same coil at different temperatures to obtain the direct current resistance temperature coefficient of the coil; normalizing the boundary resistance value and the direct current resistance value to the environmental temperature based on the direct current resistance temperature coefficient of the coil to obtain a corrected direct current resistance value; and obtaining the turn-to-turn short circuit conditions of the coils in different degrees based on the corrected direct current resistance value. It should be noted that, in the implementation of the present invention, the ambient temperature is 20 ℃, and the resistance-temperature correction formula is: rt＝R20Resistivity at different temperatures, wherein RtFor a corrected DC resistance value, R20The resistance values are scaled for the coil at 20 ℃ and the resistivity at different temperatures is 0.9208 (1+ 0.0043) ambient temperature.
S12: adjusting the gap and the stroke of an iron core of the opening and closing coil on the circuit breaker mechanism, and measuring the mechanical characteristics of the circuit breaker mechanism to obtain the gap change condition of the circuit breaker mechanism;
in a specific implementation process of the present invention, the adjusting of the gap and the stroke of the iron core of the opening and closing coil on the circuit breaker mechanism includes: and the gap and the stroke of the iron core of the opening and closing coil on the circuit breaker mechanism are enlarged or reduced by adjusting the bolt and the nut of the iron core of the opening and closing coil. It is to be noted that; in clearance and stroke grow or diminish, circuit breaker mechanism need be in the boundary of normal action, closing time and separating brake time are in circuit breaker mechanism normal parameter range promptly, and wherein, circuit breaker mechanism normal parameter range is: switching on 80% of rated voltage normally operates, switching off 65% of rated voltage normally operates, and 30% of rated voltage can not operate; the minimum clearance in the normal operation boundary of the circuit breaker mechanism can be obtained by shortening the clearance and the stroke at the same time, and the minimum clearance in the normal operation boundary of the circuit breaker mechanism can be obtained by increasing the clearance and the stroke at the same time.
S13: applying resistance on the iron core of the opening and closing coil on the circuit breaker mechanism, and measuring the current of the coil to obtain the jamming condition of the iron core;
in a specific implementation process of the present invention, the applying resistance to the iron core of the opening and closing coil on the circuit breaker mechanism includes: and a spring is arranged on the iron core of the opening and closing coil on the circuit breaker mechanism, and the magnitude of resistance is controlled by controlling the compression amount of the spring. Specifically, the change of the resistance borne by the iron core can be simulated by changing the compression amount of the spring, the resistance of the spring is gradually increased, and the current curve of the coil is measured at the same time until the boundary of the normal action of the mechanism.
In the specific implementation process of the present invention, the obtaining of the jamming condition of the iron core by measuring the current of the coil includes: obtaining coil current curve characteristics by measuring coil current, and obtaining an internal state variable of an iron core in a jamming state by measuring a resistance load; and obtaining the jamming condition of the iron core based on the current curve characteristics of the coil. It should be noted that the coil current profile is characterized by the time from when the coil is energized until the coil profile first reaches a trough. Specifically, the resistance range of the spring is evenly divided into four intervals, namely normal, attention, abnormal and serious states; and selecting one of the opening coils and one of the closing coils to set the coil jamming states to be in normal, attention, abnormal and serious states respectively, judging the coil jamming states by testing a coil current curve, taking 3 samples in each state, carrying out 2X 3X 4-24 times of tests, and recording and judging accuracy.
S14: adjusting the circuit breaker mechanism to act on a switch-off and switch-on speed boundary, and measuring the switch-off and switch-on speeds to obtain the blocking condition of the circuit breaker mechanism;
in a specific implementation process of the present invention, the adjusting the circuit breaker mechanism to operate at the boundary of the opening and closing speeds includes: adjusting the upper boundary of the breaker mechanism at the opening speed and the upper boundary of the closing speed for n times; adjusting the upper boundary of the opening speed and the lower boundary of the closing speed of the breaker mechanism for n times; adjusting the lower boundary of the switching-off speed and the upper boundary of the switching-on speed of the circuit breaker mechanism for n times; and adjusting the lower boundary of the breaker mechanism at the opening speed and the lower boundary of the closing speed for n times.
Specifically, 200 times of action tests at the limiting speed are adopted for verification in the implementation of the invention, wherein 50 times of upper boundary of switching-off speed and upper boundary of switching-on speed, 50 times of upper boundary of switching-off speed and lower boundary of switching-on speed, 50 times of lower boundary of switching-off speed and upper boundary of switching-on speed, 50 times of lower boundary of switching-off speed and lower boundary of switching-on speed, 200 times of operation speed in the action period is outside the normal boundary, the action time is in the qualified range, and the operation abnormity does not occur, namely the boundary verification is qualified.
S15: and evaluating the performance of the circuit breaker mechanism based on the coil turn-to-turn short circuit conditions of different degrees, and/or the gap variation condition of the circuit breaker mechanism, and/or the iron core jamming condition, and/or the circuit breaker mechanism jamming condition.
Specifically, the smaller the inter-turn short circuit resistance boundaries of the coils at different degrees are, the larger the upper and lower boundaries of the gap change of the circuit breaker mechanism are, the higher the accuracy rate of the judgment of the jamming condition of the iron core is, and the verification of the jamming limit speed boundary of the circuit breaker mechanism is qualified, so that the better the performance of the circuit breaker mechanism is.
In the implementation of the invention, the performance of the circuit breaker mechanism is detected and evaluated based on four aspects of the coil turn-to-turn short circuit condition, the gap change condition of the circuit breaker mechanism, the iron core jamming condition and the circuit breaker mechanism jamming condition, the maintainability and the reliability of the circuit breaker mechanism can be quantitatively evaluated, the method can be practically applied to the identification of the quality of the circuit breaker and the management and control of the quality of the network-connected circuit breaker mechanism, has important significance for reducing the faults of the circuit breaker mechanism, and can effectively select the high-performance circuit breaker mechanism.
Example two
Referring to fig. 2, fig. 2 is a schematic structural composition diagram of a device for detecting and evaluating the performance of a circuit breaker mechanism according to an embodiment of the present invention.
As shown in fig. 2, an apparatus for detecting and evaluating the performance of a circuit breaker mechanism, the apparatus comprising:
coil turn-to-turn short circuit condition acquisition module 11: the circuit breaker mechanism is used for winding opening and closing coils with different turns on the circuit breaker mechanism and obtaining turn-to-turn short circuit conditions of the coils with different degrees by measuring the direct current resistance value of the coils;
the mechanism clearance variation acquiring module 12: the circuit breaker mechanism is used for adjusting the gap and the stroke of an iron core of the opening and closing coil on the circuit breaker mechanism and obtaining the gap change condition of the circuit breaker mechanism by measuring the mechanical characteristics of the circuit breaker mechanism;
the iron core jam condition obtaining module 13: the resistance is applied to the iron core of the opening and closing coil on the circuit breaker mechanism, and the jamming condition of the iron core is obtained by measuring the current of the coil;
mechanism jam condition acquisition module 14: the circuit breaker mechanism is used for adjusting the circuit breaker mechanism to act on a switch-off and switch-on speed boundary, and the blocking condition of the circuit breaker mechanism is obtained by measuring the switch-off and switch-on speeds;
the evaluation module 15: and the circuit breaker mechanism performance evaluation module is used for evaluating the circuit breaker mechanism performance based on the coil turn-to-turn short circuit conditions of different degrees, and/or the gap variation condition of the circuit breaker mechanism, and/or the iron core jamming condition, and/or the circuit breaker mechanism jamming condition.
Specifically, the working principle of the device related function module according to the embodiment of the present invention may refer to the description related to the first method embodiment, and is not described herein again.
In the implementation of the invention, the performance of the circuit breaker mechanism is detected and evaluated based on four aspects of the coil turn-to-turn short circuit condition, the gap change condition of the circuit breaker mechanism, the iron core jamming condition and the circuit breaker mechanism jamming condition, the maintainability and the reliability of the circuit breaker mechanism can be quantitatively evaluated, the method can be practically applied to the identification of the quality of the circuit breaker and the management and control of the quality of the network-connected circuit breaker mechanism, has important significance for reducing the faults of the circuit breaker mechanism, and can effectively select the high-performance circuit breaker mechanism.
EXAMPLE III
The first method embodiment is described with reference to specific parameter settings, it should be noted that the data listed in the embodiments of the present invention are only for the circuit breaker mechanism for test evaluation, and are intended to explain the present invention, but should not be construed as limiting the present invention; the method comprises the following specific steps:
1. selecting a breaker mechanism to measure the coil resistance under a normal state on a breaker body, and gradually reducing the number of turns of the coil, wherein the specific realization method is that wiring terminals are respectively led out at 95%, 90%, 85%, … … and 5% of the coil, and different terminals are connected into a circuit to change the number of turns of the coil; the test wire is connected with the mechanical characteristic instrument and used for debugging the highest output voltage; respectively connecting different resistance wiring of a closing coil and a main branch coil of the mechanism by using a characteristic instrument control wire, respectively adjusting the output to the highest voltage (110% rated voltage of closing and 120% rated voltage of opening), verifying the reliability of action until the mechanism can not normally act, and recording the minimum resistance wiring (20%) of reliable action; measuring 20% resistance wiring of a switching-on coil and a main branch coil by using a universal meter, and recording an actual resistance value and an environmental temperature of the wiring; r20For the coil 20 ℃ time scale resistor, for the test coil, closing coil 20 ℃ time scale resistor 94 omega, opening coil 20 ℃ time scale resistor 78 omega, temperature correction formula: rt＝R20Resistivity at different temperatures, 0.9208 (1+0.0043 ambient temperature);
2. adjusting the stroke and the gap of the integrated and open-brake electromagnet to normal values, respectively performing the opening and closing operation under the lowest value (the reliable action of 80% voltage for closing, the reliable action of 65% voltage for opening and the non-action of 30% voltage) required by the national standard, verifying the action reliability, and measuring the opening and closing time; normal range of mechanism clearance (L1 is stroke, L2 is clearance): the closing L1 is 5 +/-0.3 mm, and the L2 is 1.1 +/-0.3 mm; the gate separating L1 is 4.1 +/-0.2 mm, and the gate separating L2 is 1.1 +/-0.2 mm; mechanism gap boundary range: the closing L1 is 4-8.5 mm, and the L2 is 0.1-4.6 mm; opening a brake: l1 is 3.8-4.4 mm, L2 is 0.8-1.4 mm; adjusting the stroke and the gap to a severe boundary value in sequence, adjusting the closing stroke to the condition that the bolt is completely loosened and the gap between the closing electromagnet pawl and the closing pawl is completely loosened, adjusting the opening stroke and the gap to (3.8/1.4, 3.8/0.8, 4.4/1.4 and 4.4/0.8), and performing opening and closing operation respectively at the lowest value required by the national standard to verify the action reliability;
3. switching-on and switching-off coils of the connecting mechanism are tested and recorded to serve as basic data of the test; install damping spring on combined floodgate and the vice electromagnet that divides, the bite state divides into:
(1) the working state of the damping spring is as follows: the force F of the closing electromagnet is less than or equal to 18.9N, and the corresponding trough time t is less than or equal to 18 ms; the force F of the opening electromagnet is less than or equal to 30N, the corresponding trough time t is less than or equal to 15.3ms, and the opening electromagnet corresponds to a normal state;
(2) the working state of the damping spring is as follows: f is more than 18.9N and less than or equal to 29.7N, and t is more than or equal to 19ms corresponding to the wave trough time 18; f is more than 30N and less than or equal to 50N of the opening electromagnet, t is more than 15.3 and less than or equal to 15.7ms corresponding to the trough time, and the state is noticed correspondingly;
(3) the working state of the damping spring is as follows: f is more than 29.7N and less than or equal to 35.1N, and t is more than or equal to 20ms corresponding to the trough time 19; f is more than 50N and less than or equal to 60N of the opening electromagnet, t is more than 15.7 and less than or equal to 16.2ms corresponding to the trough time, and the opening electromagnet corresponds to an abnormal state;
(4) the working state of the damping spring is as follows: f is more than 35.1N and less than or equal to 51.3N, and t is more than or equal to 21ms corresponding to the trough time of 20; f of the brake-separating electromagnet is more than 60N and less than or equal to 80N, t is more than 16.2 and less than or equal to 17.5ms corresponding to the trough time, and the brake-separating electromagnet corresponds to a serious state;
sequentially dividing the compression damping springs according to states, recording the wave trough time of a current waveform, judging the jamming state, taking 3 samples according to each state, testing for 24 times, and judging for 22 times;
4. the opening and closing speed of the circuit breaker mechanism under the normal state is measured and recorded, the opening speed: 8.7. + -. 0.5m/s (normal boundary value 8.2-9.2m/s), switching-off time: 24 +/-6 ms, closing speed: 4 +/-0.5 m/s (normal boundary value 3.5-4.5m/s), closing time: less than or equal to 85 ms. Adjusting the opening speed to be 9.2m/s and the closing speed to be 3.5m/s, performing opening and closing operations for 50 times respectively, and recording time and speed; adjusting the opening speed to be 9.2m/s and the closing speed to be 4.5m/s, performing opening and closing operations for 50 times respectively, and recording time and speed; adjusting the opening speed to 8.2m/s and the closing speed to 3.5m/s, performing opening and closing operations for 50 times respectively, and recording time and speed; adjusting the opening speed to 8.2m/s and the closing speed to 4.5m/s, performing opening and closing operations for 50 times respectively, and recording time and speed; and totally recording 200 groups of component brake data and 200 groups of combined brake data, wherein the speed value in the test data is larger than the upper limit value of the speed when the speed is adjusted to the upper limit value, the speed value in the test data is smaller than the lower limit value of the speed when the speed is adjusted to the lower limit value, and the opening and closing time meets the technical requirements.
In the implementation of the invention, the performance of the circuit breaker mechanism is detected and evaluated based on four aspects of the coil turn-to-turn short circuit condition, the gap change condition of the circuit breaker mechanism, the iron core jamming condition and the circuit breaker mechanism jamming condition, the maintainability and the reliability of the circuit breaker mechanism can be quantitatively evaluated, the method can be practically applied to the identification of the quality of the circuit breaker and the management and control of the quality of the network-connected circuit breaker mechanism, has important significance for reducing the faults of the circuit breaker mechanism, and can effectively select the high-performance circuit breaker mechanism.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like.
In addition, the method and the device for detecting and evaluating the performance of the circuit breaker mechanism provided by the embodiment of the invention are described in detail, and a specific example is adopted herein to explain the principle and the implementation manner of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A method of circuit breaker mechanism performance detection and evaluation, the method comprising:
winding opening and closing coils with different turns on the circuit breaker mechanism, and obtaining turn-to-turn short circuit conditions of the coils with different degrees by measuring direct current resistance values of the coils;
adjusting the gap and the stroke of an iron core of the opening and closing coil on the circuit breaker mechanism, and measuring the mechanical characteristics of the circuit breaker mechanism to obtain the gap change condition of the circuit breaker mechanism;
applying resistance on the iron core of the opening and closing coil on the circuit breaker mechanism, and measuring the current of the coil to obtain the jamming condition of the iron core;
adjusting the circuit breaker mechanism to act on a switch-off and switch-on speed boundary, and measuring the switch-off and switch-on speeds to obtain the blocking condition of the circuit breaker mechanism;
and evaluating the performance of the circuit breaker mechanism based on the coil turn-to-turn short circuit conditions of different degrees, and/or the gap variation condition of the circuit breaker mechanism, and/or the iron core jamming condition, and/or the circuit breaker mechanism jamming condition.
2. The method for detecting and evaluating the performance of the circuit breaker mechanism according to claim 1, wherein the step of winding the opening and closing coils with different turns on the circuit breaker mechanism comprises the following steps:
winding a switching-on and switching-off coil with the ratio of the number of turns of the coil to the number of original turns being a first preset value on a circuit breaker mechanism;
winding a switching-on and switching-off coil with the ratio of the number of turns of the coil to the number of original turns being a second preset value on the circuit breaker mechanism;
winding a switching-on and switching-off coil with the ratio of the number of turns of the coil to the original number of turns being a third preset value on the circuit breaker mechanism;
and winding the opening and closing coil with the ratio of the number of turns of the coil to the original number of turns being a fourth preset value on the circuit breaker mechanism.
3. The method for detecting and evaluating the performance of a circuit breaker mechanism of claim 2, wherein the first preset value, the second preset value, the third preset value and the fourth preset value are sequentially decreased by 5%.
4. The method of circuit breaker mechanism performance detection and evaluation of claim 1 wherein the obtaining different degrees of inter-turn short circuit by measuring the dc resistance of the coil comprises:
measuring the direct current resistance value of the same coil at different temperatures to obtain the direct current resistance temperature coefficient of the coil;
normalizing the boundary resistance value and the direct current resistance value to the environmental temperature based on the direct current resistance temperature coefficient of the coil to obtain a corrected direct current resistance value;
and obtaining the turn-to-turn short circuit conditions of the coils in different degrees based on the corrected direct current resistance value.
5. The method for circuit breaker mechanism performance detection and evaluation of claim 1 wherein said adjusting the gap and stroke of the core of the opening and closing coil on the circuit breaker mechanism comprises: and the gap and the stroke of the iron core of the opening and closing coil on the circuit breaker mechanism are enlarged or reduced by adjusting the bolt and the nut of the iron core of the opening and closing coil.
6. The method of circuit breaker mechanism performance detection and evaluation of claim 1 wherein said applying a resistive force on the core of the opening and closing coil on the circuit breaker mechanism comprises: and a spring is arranged on the iron core of the opening and closing coil on the circuit breaker mechanism, and the magnitude of resistance is controlled by controlling the compression amount of the spring.
7. The method of circuit breaker mechanism performance detection and evaluation of claim 1 wherein the obtaining of the core jam condition by measuring the coil current comprises:
obtaining coil current curve characteristics by measuring coil current, and obtaining an internal state variable of an iron core in a jamming state by measuring a resistance load;
and obtaining the jamming condition of the iron core based on the current curve characteristics of the coil.
8. The method of circuit breaker mechanism performance detection and evaluation of claim 7 wherein the coil current profile is characterized by the time from when the coil is energized to when the coil profile first reaches a trough.
9. The method for detecting and evaluating the performance of a circuit breaker mechanism according to claim 1, wherein the adjusting the circuit breaker mechanism to act on the boundary between the opening speed and the closing speed comprises:
adjusting the upper boundary of the breaker mechanism at the opening speed and the upper boundary of the closing speed for n times;
adjusting the upper boundary of the opening speed and the lower boundary of the closing speed of the breaker mechanism for n times;
adjusting the lower boundary of the switching-off speed and the upper boundary of the switching-on speed of the circuit breaker mechanism for n times;
and adjusting the lower boundary of the breaker mechanism at the opening speed and the lower boundary of the closing speed for n times.
10. An apparatus for detecting and evaluating the performance of a circuit breaker mechanism, the apparatus comprising:
coil turn-to-turn short circuit condition acquisition module: the circuit breaker mechanism is used for winding opening and closing coils with different turns on the circuit breaker mechanism and obtaining turn-to-turn short circuit conditions of the coils with different degrees by measuring the direct current resistance value of the coils;
mechanism clearance change condition acquisition module: the circuit breaker mechanism is used for adjusting the gap and the stroke of an iron core of the opening and closing coil on the circuit breaker mechanism and obtaining the gap change condition of the circuit breaker mechanism by measuring the mechanical characteristics of the circuit breaker mechanism;
the iron core jam condition acquisition module: the resistance is applied to the iron core of the opening and closing coil on the circuit breaker mechanism, and the jamming condition of the iron core is obtained by measuring the current of the coil;
mechanism jam condition acquisition module: the circuit breaker mechanism is used for adjusting the circuit breaker mechanism to act on a switch-off and switch-on speed boundary, and the blocking condition of the circuit breaker mechanism is obtained by measuring the switch-off and switch-on speeds;
an evaluation module: and the circuit breaker mechanism performance evaluation module is used for evaluating the circuit breaker mechanism performance based on the coil turn-to-turn short circuit conditions of different degrees, and/or the gap variation condition of the circuit breaker mechanism, and/or the iron core jamming condition, and/or the circuit breaker mechanism jamming condition.
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