CN118209852A - Breaker fracture synchronization measurement method and device - Google Patents
Breaker fracture synchronization measurement method and device Download PDFInfo
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- CN118209852A CN118209852A CN202410477532.8A CN202410477532A CN118209852A CN 118209852 A CN118209852 A CN 118209852A CN 202410477532 A CN202410477532 A CN 202410477532A CN 118209852 A CN118209852 A CN 118209852A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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Abstract
A breaker break synchronization measurement method and apparatus, the breaker comprising a plurality of breaks connected in series between a first node and a second node, the method comprising: constructing a first loop comprising a direct current constant voltage source, a resistor and the circuit breaker; constructing a second loop comprising a high-frequency alternating current power supply, an inductor, a capacitor and the circuit breaker; tuning the second loop so that the second loop reaches a resonance state when the circuit breaker is in a brake-off state after brake-off; respectively switching on and switching off the circuit breaker, timing during switching on and switching off of the circuit breaker, and measuring a curve of voltage change between the first node and the second node along with time to obtain a switching-on voltage waveform and a switching-off voltage waveform; determining a closing time and a closing synchronization quantity based on the closing voltage waveform; and determining the opening time and the opening synchronous quantity based on the opening voltage waveform. The invention can realize the measurement of the opening and closing time and the fracture synchronization of the circuit breaker after encapsulation.
Description
Technical Field
The invention relates to the field of electronic power, in particular to a breaker fracture synchronization measurement method and device.
Background
The mechanical characteristics of the circuit breaker are important features reflecting the performance of the circuit breaker. The mechanical characteristics of the circuit breaker comprise opening and closing time, opening and closing synchronization quantity and the like, and the circuit breaker with multiple single-phase breaks also comprises inter-break synchronization quantity. The synchronization quantity among the breaker breaks is an important index of the breaking performance of the breaker. The breaker break-to-break brake synchronization amount is the corresponding time from the break of a first break to the break of all the break of a final breaker, and the time reference is the electrified time of a break-to-break coil; the synchronous quantity of the break switch-on is the time from the first break switch-on time to the time when all the break switches are switched on in the final breaker, and the time reference is the electrified time of the switch-on coil. The synchronous exceeding and poor synchronism of the opening and closing of the single-phase circuit breaker can cause great influence on the opening and closing capability of the circuit breaker, so that the loss of synchronous detection of the opening and closing of the single-phase circuit breaker can cause great hidden trouble to the safety of a power system.
As shown in fig. 1, early circuit breakers were open circuit breakers, and open multi-break single-phase circuit breakers were directly measurable for the inter-break (e.g., between break 1 and break 2) connections. In the conventional measurement of the open-type multi-fracture single-phase circuit breaker, a data acquisition processing unit controls a coil measurement and control unit to send out an instruction to control the opening and closing coil of the circuit breaker so as to open and close the circuit breaker through a circuit breaker mechanism, and meanwhile, a data acquisition processing system starts timing (the opening and closing timing of the circuit breaker starts timing with the electrification of the opening and closing coil); after the opening and closing action of the circuit breaker is started, the data acquisition processing control unit reflects the state of the circuit breaker by monitoring the voltage change between the wiring terminals of the circuit breaker, and takes the state abrupt change as a timing point.
With the development of the switchgear, devices such as a GIS are widely used, and a circuit breaker is taken as one of the components and is integrally packaged in a metal cylinder of the GIS, as shown in fig. 2. Because the multi-fracture single-phase circuit breaker is no longer visible due to the inter-fracture connection, the inter-fracture synchronization cannot be measured.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a method and a device for synchronously measuring the break of a breaker so as to realize the measurement of the breaking and closing time and the break synchronous quantity of the breaker after encapsulation.
The invention adopts the following technical scheme.
According to a first aspect of the present invention, there is provided a method of breaker fracture synchronization measurement, the breaker comprising a plurality of fractures connected in series between a first node and a second node. The breaker fracture synchronization measurement method comprises the following steps:
constructing a first loop comprising a direct current constant voltage source, a resistor and the circuit breaker;
constructing a second loop comprising a high-frequency alternating current power supply, an inductor, a capacitor and the circuit breaker;
tuning the second loop so that the second loop reaches a resonance state when the circuit breaker is in a brake-off state after brake-off;
respectively switching on and switching off the circuit breaker, timing during switching on and switching off of the circuit breaker, and measuring a curve of voltage change between the first node and the second node along with time to obtain a switching-on voltage waveform and a switching-off voltage waveform;
determining a closing time and a closing synchronization quantity based on the closing voltage waveform;
And determining the opening time and the opening synchronous quantity based on the opening voltage waveform.
In one embodiment, the determining the closing time and closing synchronization amount based on the closing voltage waveform includes:
Decomposing the switching-on voltage waveform into a switching-on direct-current voltage part and a switching-on alternating-current voltage part;
and determining the closing time and the closing synchronous quantity based on the closing direct-current voltage part and the closing alternating-current voltage part.
In one embodiment, the determining the closing time and the closing synchronization amount based on the closing dc voltage part and the closing ac voltage part includes:
determining initial power-on time t1 of a closing coil in the circuit breaker;
Determining a drop mutation point of the switching-on alternating-current voltage part as a switching-on time point t2 of the first fracture;
Determining a drop mutation point of the switching-on direct-current voltage part as a switching-on time point t3 of the second fracture;
determining the time difference between a time point t3 and a time point t1 to obtain the closing time amount of the circuit breaker;
And determining the time difference between the time point t3 and the time point t2 to obtain the synchronous quantity of the closing fracture of the circuit breaker.
In one embodiment, the determining the opening time and the opening synchronization amount based on the opening voltage waveform includes:
decomposing the switching-off voltage waveform into a switching-off direct-current voltage part and a switching-off alternating-current voltage part;
and determining the opening time and the opening synchronous quantity based on the opening direct-current voltage part and the opening alternating-current voltage part.
In one embodiment, the determining the opening time and the opening synchronization amount based on the opening direct-current voltage part and the opening alternating-current voltage part includes:
determining the initial power-on time t4 of a switching-off coil in the circuit breaker;
determining a sharp increase mutation point of the opening direct-current voltage part as an opening time point t5 of the first fracture;
determining a sharp increase abrupt point of the opening alternating current voltage part as a closing time point t6 of the second fracture;
determining the time difference between a time point t6 and a time point t4 to obtain the closing time amount of the circuit breaker;
And determining the time difference between the time point t6 and the time point t5 to obtain the synchronous quantity of the closing fracture of the circuit breaker.
According to a second aspect of the present invention, there is provided a breaker fracture synchronization measurement apparatus, the breaker comprising a plurality of fractures connected in series between a first node and a second node. The breaker fracture synchronization measuring device comprises:
the first loop comprises a direct current constant voltage source, a resistor and the circuit breaker;
a second loop including a high frequency ac power source, an inductance, a capacitance, and a second loop of the circuit breaker;
The coil measurement and control unit is used for responding to the switching-on and switching-off instructions to control the actions of switching-on and switching-off coils in the circuit breaker so as to realize switching-on and switching-off of the circuit breaker;
A timing unit;
The data acquisition processing unit is respectively connected to the coil measurement and control unit, the timing unit, the first node and the second node and is used for sending switching-on and switching-off instructions to the coil control unit; controlling a timing unit to perform timing; measuring a curve of voltage change between a first node and a second node along with time in the switching-on and switching-off periods of the circuit breaker to obtain a switching-on voltage waveform and a switching-off voltage waveform; determining a closing time and a closing synchronization quantity based on the closing voltage waveform; and determining the opening time and the opening synchronous quantity based on the opening voltage waveform.
In an embodiment, the data acquisition processing unit is further configured to:
Decomposing the switching-on voltage waveform into a switching-on direct-current voltage part and a switching-on alternating-current voltage part;
and determining the closing time and the closing synchronous quantity based on the closing direct-current voltage part and the closing alternating-current voltage part.
In an embodiment, the data acquisition processing unit is further configured to:
Determining the initial power-on time t1 of a closing coil in the circuit breaker through a feedback signal of the coil measurement and control unit;
Determining a drop mutation point of the switching-on alternating-current voltage part as a switching-on time point t2 of the first fracture;
Determining a drop mutation point of the switching-on direct-current voltage part as a switching-on time point t3 of the second fracture;
determining the time difference between a time point t3 and a time point t1 to obtain the closing time amount of the circuit breaker;
And determining the time difference between the time point t3 and the time point t2 to obtain the synchronous quantity of the closing fracture of the circuit breaker.
In an embodiment, the data acquisition processing unit is further configured to:
decomposing the switching-off voltage waveform into a switching-off direct-current voltage part and a switching-off alternating-current voltage part;
and determining the opening time and the opening synchronous quantity based on the opening direct-current voltage part and the opening alternating-current voltage part.
In an embodiment, the data acquisition processing unit is further configured to:
Determining the initial power-on time t4 of a switching-off coil in the circuit breaker through the coil measurement and control unit;
determining a sharp increase mutation point of the opening direct-current voltage part as an opening time point t5 of the first fracture;
determining a sharp increase abrupt point of the opening alternating current voltage part as a closing time point t6 of the second fracture;
determining the time difference between a time point t6 and a time point t4 to obtain the closing time amount of the circuit breaker;
And determining the time difference between the time point t6 and the time point t5 to obtain the synchronous quantity of the closing fracture of the circuit breaker.
Compared with the prior art, the invention has the beneficial effects that a high-frequency alternating current power supply resonant circuit comprising a high-frequency alternating current power supply, a capacitor, an inductor and a circuit breaker is constructed, and a direct current power supply circuit comprising a direct current constant voltage source, a resistor and a circuit breaker is also constructed; the capacitor in the high-frequency power supply resonant circuit plays a role in isolating the direct-current power supply, and can lift the high-frequency power supply voltage at two ends of the circuit breaker under the excitation of the high-frequency alternating-current power supply so as to facilitate measurement. Through the high-frequency alternating current power supply loop and the direct current power supply loop, a corresponding direct current voltage part and alternating current voltage part can be generated in the circuit breaker; the switching-on voltage waveform and the switching-off voltage waveform can be obtained by measuring the real-time voltage at the two ends of the breaker during the switching-on period and the switching-off period. Because the switching-on voltage waveform and the switching-off voltage waveform respectively comprise an alternating current voltage part and a direct current voltage part, and the alternating current voltage part and the direct current voltage part can generate different voltage changes in the switching-on and switching-off periods of the circuit breaker, the switching-on time and the switching-on synchronous quantity can be determined based on the switching-on voltage waveform, and the switching-off time and the switching-off synchronous quantity can be determined based on the switching-off voltage waveform. In a word, the invention can realize the measurement of the switching-on/off time and the fracture synchronization of the packaged breaker, and has simple structure and easy operation.
Drawings
Fig. 1 is a schematic structural view of a fracture synchronization measuring device of an open circuit breaker in the prior art;
fig. 2 is a schematic structural view of a fracture of a circuit breaker enclosed in a metal can according to the prior art;
FIG. 3 is a flow chart of a method for breaker fracture synchronization measurement in accordance with one embodiment of the present application;
fig. 4 is a schematic structural diagram of an apparatus for measuring breaker fracture synchronization according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. The described embodiments of the application are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art without inventive faculty, are within the scope of the application, based on the spirit of the application.
According to a first aspect of the invention, a breaker fracture synchronization measurement method is provided.
In one embodiment, the breaker fracture synchronization measurement method of the present invention is applicable to a breaker including a plurality of fractures connected in series between a first node and a second node. As shown in fig. 3, the method may include the steps of:
and 1, constructing a first loop comprising a constant voltage direct current source, a resistor and the circuit breaker.
The first loop is a substantially dc loop, and therefore the first loop typically does not include an ac element such as an inductor, a capacitor, and/or an ac power source.
And 2, constructing a second loop comprising a high-frequency alternating current power supply, an inductor, a capacitor and the circuit breaker.
The second circuit is an ac circuit, and generally does not include dc power components such as a dc constant voltage source. At the same time, one or more of the high frequency ac power supply, inductance and capacitance in the second loop should be adjustable to ensure that the ac loop can be tuned for subsequent measurements. In addition, the inductance in the second loop can be either a single inductance or an equivalent inductance of a plurality of inductances; similarly, the capacitance in the second loop may be either a single capacitance or an equivalent capacitance of multiple capacitances.
And 3, tuning the second loop so that the second loop reaches a resonance state when the circuit breaker is in a breaking state after breaking.
In this step, tuning the second loop may generally be achieved by adjusting the frequency, inductance and/or capacitance of the high frequency ac power supply in the second loop.
The opening state after opening the gate refers to a state that all the breaks in the breaker are opened.
The resonance state refers to a state that the capacitive reactance in the alternating current loop is equal to the inductive reactance, namely, the condition that: ωl=1/ωc, where ω is the angular frequency of the ac power supply, L is the capacitance, and C is the inductance. When the loop is in a resonant state, the amplitude of the voltage oscillation in the loop reaches a maximum.
And 4, respectively switching on and switching off the circuit breaker, timing during switching on and switching off of the circuit breaker, and measuring a curve of voltage change between the first node and the second node along with time to obtain a switching-on voltage waveform and a switching-off voltage waveform.
The circuit breaker closing and circuit breaker opening can be realized by controlling a closing coil and an opening coil in the circuit breaker.
The switching-on and switching-off period of the circuit breaker can refer to the process from the time of controlling the coil of the circuit breaker to switch on and off to the time of completing the switching-on and switching-off.
Furthermore, after the tuning of the second circuit is completed, the frequency, inductance and/or capacitance value of the ac voltage source in the second circuit is no longer changed during the closing and opening of the circuit breaker.
And step 5, determining the closing time and closing synchronization quantity based on the closing voltage waveform.
The closing time refers to the time from starting to electrify a closing coil in the circuit breaker to completing closing of all the breaks. The closing synchronization amount refers to the time from the closing of a first fracture to the closing of all fractures in the circuit breaker.
And 6, determining the opening time and the opening synchronous quantity based on the opening voltage waveform.
The breaking time refers to the time from starting to electrify the breaking coil in the breaker to finishing breaking of all the breaks. The brake opening synchronization amount refers to the time from the opening of the first fracture to the opening of all fractures in the short-circuiting device.
In this embodiment, by constructing a first loop including a high-frequency alternating-current power source, a capacitor, an inductor, and a circuit breaker, and constructing a second loop including a direct-current constant-voltage power source, a resistor, and a circuit breaker, the voltage across the circuit breaker can be made to include both a direct-current voltage portion and an alternating-current voltage portion. Further, a closing voltage waveform and a breaking voltage waveform are obtained by measuring the real-time voltages at two ends of the breaker during closing and breaking. Because the switching-on voltage waveform and the switching-off voltage waveform respectively comprise an alternating current voltage part and a direct current voltage part, and the alternating current voltage part and the direct current voltage part can generate different voltage changes in the switching-on and switching-off periods of the circuit breaker, the switching-on time and the switching-on synchronous quantity can be determined based on the switching-on voltage waveform, and the switching-off time and the switching-off synchronous quantity can be determined based on the switching-off voltage waveform.
Further, in step 5, the determining the closing time and the closing synchronization amount based on the closing voltage waveform further includes:
And step 51, decomposing the switching-on voltage waveform into a switching-on direct-current voltage part and a switching-on alternating-current voltage part.
The decomposition may be performed by fourier transform or the like. The specific decomposition process is not described in detail.
And step 52, determining the closing time and the closing synchronization quantity based on the closing direct-current voltage part and the closing alternating-current voltage part.
Because the switching-on alternating-current voltage part and the switching-on direct-current voltage part can generate different voltage changes during the switching-on period of the circuit breaker, the switching-on time and the switching-on synchronous quantity can be determined based on the switching-on voltage waveform, and the switching-off time and the switching-off synchronous quantity can be determined based on the switching-off voltage waveform.
Further, in step 52, the determining the closing time and the closing synchronization amount based on the closing dc voltage part and the closing ac voltage part further includes:
in step 521, an initial power-on time t1 of the closing coil in the circuit breaker is determined.
And 522, determining a corresponding time point when the amplitude reduction amount of the switching-on alternating-current voltage part exceeds a first threshold value as a switching-on time point t2 of the first fracture.
The amplitude reduction refers to the oscillation amplitude reduction of the switching-on alternating-current voltage part, and not the voltage value reduction. The first threshold may be set according to the actual situation.
When the first break of the circuit breaker is closed (i.e. shorted), the total capacitance of all the breaks is reduced, so that the second loop (ac loop) is detuned, and the oscillation amplitude of the closed ac voltage portion suddenly drops, so that the closing time t2 of the first break can be determined by detecting the amplitude drop abrupt point (i.e. the time point corresponding to the amplitude reduction exceeding the specific threshold value) of the closed ac voltage portion.
And step 523, determining a corresponding time point when the voltage value reduction of the switching-on direct-current voltage part exceeds a second threshold value as a switching-on time point t3 of the second fracture.
The second threshold may be set according to actual situations, and may be equal to the first threshold or may not be equal to the first threshold.
When the last fracture of the circuit breaker is closed (i.e. short-circuited), the total capacitance of all the fractures is reduced, so that the first loop (direct current loop) is conducted, and the voltage value of the closing direct current voltage parts at the two ends of the circuit breaker suddenly drops, so that the closing time point t3 of the last fracture, namely the time point when all the fractures are closed, can be determined by detecting the voltage value drop abrupt change point (i.e. the time point when the voltage value reduction exceeds a specific threshold value) of the closing direct current voltage parts.
Step 524, determining the time difference between the time point t3 and the time point t1, and obtaining the closing time amount of the breaker.
And 525, determining the time difference between the time point t3 and the time point t2, and obtaining the synchronous quantity of the closing fracture of the circuit breaker.
In this embodiment, the closing time point t2 of the first break is determined by detecting the amplitude drop point of the closing ac voltage portion, the closing time point t3 of the last break is determined by detecting the voltage drop point of the closing dc voltage portion, and the starting power-on time point t1 of the closing coil in the circuit breaker is combined, so that the closing time amount and the closing break synchronization amount of a plurality of breaks in the packaged circuit breaker can be determined.
Further, in step 6, the determining the opening time and the opening synchronization amount based on the opening voltage waveform further includes:
Step 61, decomposing the split-gate voltage waveform into a split-gate DC voltage part and a split-gate AC voltage part.
Similar to step 51, the decomposition may be performed by means of fourier transform or the like. The specific decomposition process is not described in detail.
Step 62, determining the opening time and opening synchronization amount based on the opening DC voltage part and the opening AC voltage part.
Because the switching-on alternating-current voltage part and the switching-on direct-current voltage part can generate different voltage changes during the switching-on period of the circuit breaker, the switching-on time and the switching-on synchronous quantity can be determined based on the switching-on voltage waveform, and the switching-off time and the switching-off synchronous quantity can be determined based on the switching-off voltage waveform.
Further, in step 62, the determining the opening time and the opening synchronization amount based on the opening dc voltage part and the opening ac voltage part further includes:
in step 621, an initial power-up time t4 of the opening coil in the circuit breaker is determined.
Step 622, determining a corresponding time point when the magnitude increase of the opening dc voltage portion exceeds a first threshold as an opening time point t5 of the first break.
The amplitude increasing amount refers to the oscillation amplitude increasing amount of the switching-on alternating-current voltage part, and is not the increasing amount of the voltage value. The first threshold may be set according to the actual situation.
When the first break of the circuit breaker is opened (i.e. disconnected), the total capacitance of all the breaks is increased, so that the first loop (direct current loop) is disconnected, and the voltage value of the switching-on direct current voltage part at two ends of the circuit breaker is suddenly increased, so that the opening time t5 of the first break can be determined by detecting the sudden increase point of the voltage value of the switching-on direct current voltage part (i.e. the time point corresponding to the voltage value increasing amount exceeding a specific threshold).
Step 623, determining a corresponding time point when the voltage value increase of the opening ac voltage portion exceeds a second threshold value as a closing time point t6 of the second break.
The second threshold may be set according to the actual situation, and may or may not be equal to the first threshold.
When the last break of the breaker is opened (i.e. disconnected), the second loop (alternating current loop) is in a resonance state, and the oscillation amplitude of the opening alternating current voltage parts at the two ends of the breaker is suddenly increased, so that the opening time point t6 of the last break, namely the time point when all the breaks are opened, can be determined by detecting the amplitude sharp increase mutation point (i.e. the time point corresponding to the amplitude increase exceeding a specific threshold value) of the opening alternating current voltage parts.
Step 624, determining the time difference between the time point t6 and the time point t4, and obtaining the opening time amount of the circuit breaker.
And step 625, determining the time difference between the time point t6 and the time point t5, and obtaining the synchronization quantity of the breaking and breaking ports of the circuit breaker.
In this embodiment, the break-over time t5 of the first break is determined by detecting the sudden increase point of the voltage value of the break-over dc voltage part, the break-over time t6 of the last break is determined by detecting the sudden increase point of the amplitude of the break-over ac voltage part, and the break-over time and break synchronization of the break-over time of the plurality of breaks in the packaged breaker are determined by combining with the initial power-on time t4 of the break-over coil in the breaker.
According to a second aspect of the present invention, there is provided a breaker fracture synchronization measurement apparatus, the breaker comprising a plurality of fractures connected in series between a first node and a second node.
In one embodiment, as shown in fig. 4, the breaker fracture synchronization measuring apparatus of the present invention includes:
the first loop comprises a direct current constant voltage source, a resistor and the circuit breaker;
a second loop including a high frequency ac power source, an inductance, a capacitance, and a second loop of the circuit breaker;
The coil measurement and control unit is used for responding to the switching-on and switching-off instructions to control the actions of switching-on and switching-off coils in the circuit breaker so as to realize switching-on and switching-off of the circuit breaker;
A timing unit;
The data acquisition processing unit is respectively connected to the coil measurement and control unit, the timing unit, the first node and the second node and is used for sending switching-on and switching-off instructions to the coil control unit; controlling a timing unit to perform timing; measuring a curve of voltage change between a first node and a second node along with time in the switching-on and switching-off periods of the circuit breaker to obtain a switching-on voltage waveform and a switching-off voltage waveform; determining a closing time and a closing synchronization quantity based on the closing voltage waveform; and determining the opening time and the opening synchronous quantity based on the opening voltage waveform.
In this embodiment, by constructing a first loop including a high-frequency alternating-current power source, a capacitor, an inductor, and a circuit breaker, and constructing a second loop including a direct-current constant-voltage power source, a resistor, and a circuit breaker, the voltage across the circuit breaker can be made to include both a direct-current voltage portion and an alternating-current voltage portion. Furthermore, the data acquisition processing unit is used for controlling the coil measurement and control unit to realize switching-on and switching-off of the circuit breaker, the data acquisition processing unit is used for controlling the timing unit to time, and the data acquisition processing unit is used for measuring the real-time voltage at two ends of the circuit breaker during switching-on and switching-off to obtain a switching-on voltage waveform and a switching-off voltage waveform. Because the switching-on voltage waveform and the switching-off voltage waveform respectively comprise an alternating current voltage part and a direct current voltage part, and the alternating current voltage part and the direct current voltage part can generate different voltage changes in the switching-on and switching-off periods of the circuit breaker, the switching-on time and the switching-on synchronous quantity can be determined based on the switching-on voltage waveform, and the switching-off time and the switching-off synchronous quantity can be determined based on the switching-off voltage waveform.
Preferably, the first loop does not comprise an ac element such as an inductance, capacitance and/or ac power source.
Preferably, no dc power supply element such as a dc constant voltage source is included. At the same time, one or more of the high frequency ac power supply, inductance and capacitance in the second loop should be adjustable to ensure that the ac loop can be tuned for subsequent measurements.
Further, the inductance in the second loop may be either a single inductance or an equivalent inductance of multiple inductances; similarly, the capacitance in the second loop may be either a single capacitance or an equivalent capacitance of multiple capacitances.
Preferably, the timing unit is a crystal oscillator timing unit, and the frequency of the high-frequency alternating current power supply is larger than the crystal oscillator frequency of the timing unit, so that the accuracy and precision of subsequent measurement are ensured.
Further, the data acquisition processing unit is further configured to:
Decomposing the switching-on voltage waveform into a switching-on direct-current voltage part and a switching-on alternating-current voltage part;
and determining the closing time and the closing synchronous quantity based on the closing direct-current voltage part and the closing alternating-current voltage part.
Further, the data acquisition processing unit is further configured to:
Determining the initial power-on time t1 of a closing coil in the circuit breaker through a feedback signal of the coil measurement and control unit;
Determining a corresponding time point when the amplitude reduction of the switching-on alternating-current voltage part exceeds a first threshold value as a switching-on time point t2 of the first fracture;
determining a corresponding time point when the voltage value reduction of the switching-on direct-current voltage part exceeds a second threshold value as a switching-on time point t3 of the second fracture;
determining the time difference between a time point t3 and a time point t1 to obtain the closing time amount of the circuit breaker;
And determining the time difference between the time point t3 and the time point t2 to obtain the synchronous quantity of the closing fracture of the circuit breaker.
Further, the data acquisition processing unit is further configured to:
decomposing the switching-off voltage waveform into a switching-off direct-current voltage part and a switching-off alternating-current voltage part;
and determining the opening time and the opening synchronous quantity based on the opening direct-current voltage part and the opening alternating-current voltage part.
Further, the data acquisition processing unit is further configured to:
Determining the initial power-on time t4 of a switching-off coil in the circuit breaker through the coil measurement and control unit;
Determining a corresponding time point when the amplitude increasing amount of the opening direct current voltage part exceeds a first threshold value as an opening time point t5 of the first fracture;
determining a corresponding time point when the voltage value increment of the opening alternating current voltage part exceeds a second threshold value as a closing time point t6 of the second fracture;
determining the time difference between a time point t6 and a time point t4 to obtain the closing time amount of the circuit breaker;
And determining the time difference between the time point t6 and the time point t5 to obtain the synchronous quantity of the closing fracture of the circuit breaker.
Compared with the prior art, the invention has the advantages that the measurement of the opening and closing time and the opening and closing fracture synchronization of the packaged circuit breaker can be realized, and the structure is simple and the operation is easy.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (10)
1. A method of breaker break synchronization measurement, the breaker including a plurality of breaks connected in series between a first node and a second node, comprising:
constructing a first loop comprising a direct current constant voltage source, a resistor and the circuit breaker;
constructing a second loop comprising a high-frequency alternating current power supply, an inductor, a capacitor and the circuit breaker;
tuning the second loop so that the second loop reaches a resonance state when the circuit breaker is in a brake-off state after brake-off;
respectively switching on and switching off the circuit breaker, timing during switching on and switching off of the circuit breaker, and measuring a curve of voltage change between the first node and the second node along with time to obtain a switching-on voltage waveform and a switching-off voltage waveform;
determining a closing time and a closing synchronization quantity based on the closing voltage waveform;
And determining the opening time and the opening synchronous quantity based on the opening voltage waveform.
2. The breaker fracture synchronization measurement method of claim 1, wherein the determining a closing time and a closing synchronization amount based on the closing voltage waveform comprises:
Decomposing the switching-on voltage waveform into a switching-on direct-current voltage part and a switching-on alternating-current voltage part;
and determining the closing time and the closing synchronous quantity based on the closing direct-current voltage part and the closing alternating-current voltage part.
3. The breaker break synchronization measurement method according to claim 2, wherein the determining the closing time and the closing synchronization amount based on the closing direct current voltage part and the closing alternating current voltage part includes:
determining initial power-on time t1 of a closing coil in the circuit breaker;
Determining a corresponding time point when the amplitude reduction of the switching-on alternating-current voltage part exceeds a first threshold value as a switching-on time point t2 of the first fracture;
determining a corresponding time point when the voltage value reduction of the switching-on direct-current voltage part exceeds a second threshold value as a switching-on time point t3 of the second fracture;
determining the time difference between a time point t3 and a time point t1 to obtain the closing time amount of the circuit breaker;
And determining the time difference between the time point t3 and the time point t2 to obtain the synchronous quantity of the closing fracture of the circuit breaker.
4. The breaker fracture synchronization measurement method of claim 1, wherein the determining the opening time and the opening synchronization amount based on the opening voltage waveform comprises:
decomposing the switching-off voltage waveform into a switching-off direct-current voltage part and a switching-off alternating-current voltage part;
and determining the opening time and the opening synchronous quantity based on the opening direct-current voltage part and the opening alternating-current voltage part.
5. The breaker break synchronization measurement method according to claim 4, wherein the determining the break-off time and the break-off synchronization amount based on the break-off direct voltage portion and the break-off alternating voltage portion includes:
determining the initial power-on time t4 of a switching-off coil in the circuit breaker;
Determining a corresponding time point when the amplitude increasing amount of the opening direct current voltage part exceeds a first threshold value as an opening time point t5 of the first fracture;
determining a corresponding time point when the voltage value increment of the opening alternating current voltage part exceeds a second threshold value as a closing time point t6 of the second fracture;
determining the time difference between a time point t6 and a time point t4 to obtain the closing time amount of the circuit breaker;
And determining the time difference between the time point t6 and the time point t5 to obtain the synchronous quantity of the closing fracture of the circuit breaker.
6. A breaker break synchronization measurement apparatus, the breaker including a plurality of breaks connected in series between a first node and a second node, comprising:
the first loop comprises a direct current constant voltage source, a resistor and the circuit breaker;
a second loop including a high frequency ac power source, an inductance, a capacitance, and a second loop of the circuit breaker;
The coil measurement and control unit is used for responding to the switching-on and switching-off instructions to control the actions of switching-on and switching-off coils in the circuit breaker so as to realize switching-on and switching-off of the circuit breaker;
A timing unit;
The data acquisition processing unit is respectively connected to the coil measurement and control unit, the timing unit, the first node and the second node and is used for sending switching-on and switching-off instructions to the coil control unit; controlling a timing unit to perform timing; measuring a curve of voltage change between a first node and a second node along with time in the switching-on and switching-off periods of the circuit breaker to obtain a switching-on voltage waveform and a switching-off voltage waveform; determining a closing time and a closing synchronization quantity based on the closing voltage waveform; and determining the opening time and the opening synchronous quantity based on the opening voltage waveform.
7. The breaker fracture synchronization measurement apparatus of claim 6, wherein the data acquisition processing unit is further configured to:
Decomposing the switching-on voltage waveform into a switching-on direct-current voltage part and a switching-on alternating-current voltage part;
and determining the closing time and the closing synchronous quantity based on the closing direct-current voltage part and the closing alternating-current voltage part.
8. The breaker fracture synchronization measurement apparatus of claim 7, wherein the data acquisition processing unit is further configured to:
Determining the initial power-on time t1 of a closing coil in the circuit breaker through a feedback signal of the coil measurement and control unit;
Determining a corresponding time point when the amplitude reduction of the switching-on alternating-current voltage part exceeds a first threshold value as a switching-on time point t2 of the first fracture;
determining a corresponding time point when the voltage value reduction of the switching-on direct-current voltage part exceeds a second threshold value as a switching-on time point t3 of the second fracture;
determining the time difference between a time point t3 and a time point t1 to obtain the closing time amount of the circuit breaker;
And determining the time difference between the time point t3 and the time point t2 to obtain the synchronous quantity of the closing fracture of the circuit breaker.
9. The breaker fracture synchronization measurement apparatus of claim 6, wherein the data acquisition processing unit is further configured to:
decomposing the switching-off voltage waveform into a switching-off direct-current voltage part and a switching-off alternating-current voltage part;
and determining the opening time and the opening synchronous quantity based on the opening direct-current voltage part and the opening alternating-current voltage part.
10. The breaker fracture synchronization measurement apparatus of claim 9, wherein the data acquisition processing unit is further configured to:
Determining the initial power-on time t4 of a switching-off coil in the circuit breaker through the coil measurement and control unit;
Determining a corresponding time point when the amplitude increasing amount of the opening direct current voltage part exceeds a first threshold value as an opening time point t5 of the first fracture;
determining a corresponding time point when the voltage value increment of the opening alternating current voltage part exceeds a second threshold value as a closing time point t6 of the second fracture;
determining the time difference between a time point t6 and a time point t4 to obtain the closing time amount of the circuit breaker;
And determining the time difference between the time point t6 and the time point t5 to obtain the synchronous quantity of the closing fracture of the circuit breaker.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410477532.8A CN118209852A (en) | 2024-04-19 | 2024-04-19 | Breaker fracture synchronization measurement method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410477532.8A CN118209852A (en) | 2024-04-19 | 2024-04-19 | Breaker fracture synchronization measurement method and device |
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| CN118209852A true CN118209852A (en) | 2024-06-18 |
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| CN202410477532.8A Pending CN118209852A (en) | 2024-04-19 | 2024-04-19 | Breaker fracture synchronization measurement method and device |
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| CN (1) | CN118209852A (en) |
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