CN118209852A - A method and device for synchronous measurement of circuit breaker fracture - Google Patents

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

A method and device for synchronous measurement of circuit breaker fracture

Technical Field

The present invention relates to the field of electronic power, and more specifically, to a circuit breaker break synchronization measurement method and device.

Background technique

The mechanical characteristics of circuit breakers are important features that reflect the performance of circuit breakers. The mechanical characteristics of circuit breakers include opening and closing time, opening and closing synchronization, etc. For multi-break single-phase circuit breakers, it also includes the synchronization between breaks. The synchronization between breaks of circuit breakers is an important indicator of its breaking performance. Among them, the opening synchronization between breaks of circuit breakers is the time corresponding to the opening of the first break from the opening of the first break to the final opening of all breaks of the circuit breaker, and the time basis is the energized time of the opening coil; the closing synchronization between breaks is the time when all breaks are closed from the closing time of the first break to the final closing of all breaks of the circuit breaker, and the time basis is the energized time of the closing coil. If the opening and closing synchronization between breaks in single-phase circuit breakers exceeds the standard and the synchronization is poor, it will have a significant impact on the opening and closing capacity of the circuit breaker. Therefore, the loss of synchronization detection between breaks will cause major hidden dangers to the safety of the power system.

As shown in Figure 1, most early circuit breakers were open-type circuit breakers. Since the connections between the breaks (e.g., between break 1 and break 2) of open-type single-phase multi-break circuit breakers are visible, the synchronization between the breaks can be directly measured. In conventional measurements of open-type single-phase multi-break circuit breakers, the data acquisition and processing unit controls the coil measurement and control unit to issue instructions to control the action of the circuit breaker opening and closing coils, thereby opening and closing the circuit breaker through the circuit breaker mechanism, and at the same time, the data acquisition and processing system starts timing (the circuit breaker opening and closing timing is based on the opening and closing coil being energized to start timing); after the circuit breaker opening and closing action starts, the data acquisition and processing control unit reflects the state of the circuit breaker by monitoring the voltage changes between the circuit breaker's wireable terminals, and uses the state mutation as the timing point.

With the development of switchgear, GIS and other equipment have become widely popular. As one of the components, the circuit breaker is encapsulated in the metal cylinder of GIS as a whole, as shown in Figure 2. Since the connection between the breaks of a multi-break single-phase circuit breaker is no longer visible, the synchronization between the breaks cannot be measured.

Summary of the invention

In order to solve the deficiencies in the prior art, the present invention provides a circuit breaker break synchronization measurement method and device to achieve the measurement of the opening and closing time and break synchronization of the encapsulated circuit breaker.

The present invention adopts the following technical solution.

According to a first aspect of the present invention, a method for measuring the synchronous operation of a circuit breaker is provided, wherein the circuit breaker comprises a plurality of circuit breakers connected in series between a first node and a second node. The method for measuring the synchronous operation of a circuit breaker comprises:

Constructing a first circuit including a DC constant voltage source, a resistor and the circuit breaker;

Constructing a second circuit including a high-frequency AC power source, an inductor, a capacitor and the circuit breaker;

Tuning the second circuit so that the second circuit reaches a resonant state when the circuit breaker is in an open state after opening;

Closing and opening the circuit breaker are respectively performed, timing is performed during the closing and opening of the circuit breaker, and a curve of the voltage between the first node and the second node changing with time is measured to obtain a closing voltage waveform and an opening voltage waveform;

Determining the closing time and closing synchronization amount based on the closing voltage waveform;

The opening time and the opening synchronization amount are determined based on the opening voltage waveform.

In one embodiment, determining the closing time and the closing synchronization amount based on the closing voltage waveform includes:

Decomposing the closing voltage waveform into a closing DC voltage portion and a closing AC voltage portion;

The closing time and closing synchronization quantity are determined based on the closing DC voltage part and the closing AC voltage part.

In one embodiment, determining the closing time and the closing synchronization amount based on the closing DC voltage part and the closing AC voltage part includes:

Determine the starting power-on time t1 of the closing coil in the circuit breaker;

Determine the sudden drop point of the closing AC voltage part as the closing time point t2 of the first break;

Determine the sudden drop point of the closing DC voltage part as the closing time point t3 of the second break;

Determine the time difference between time point t3 and time point t1 to obtain the circuit breaker closing time;

The time difference between time point t3 and time point t2 is determined to obtain the circuit breaker closing break synchronization quantity.

In one embodiment, determining the opening time and the opening synchronization amount based on the opening voltage waveform includes:

Decomposing the opening voltage waveform into an opening DC voltage portion and an opening AC voltage portion;

The opening time and opening synchronization quantity are determined based on the opening DC voltage part and the opening AC voltage part.

In one embodiment, determining the opening time and the opening synchronization amount based on the opening DC voltage part and the opening AC voltage part includes:

Determine the starting power-on time t4 of the opening coil in the circuit breaker;

Determine the surge mutation point of the opening DC voltage part as the opening time point t5 of the first break;

Determine the surge mutation point of the opening AC voltage part as the closing time point t6 of the second break;

Determine the time difference between time point t6 and time point t4 to obtain the circuit breaker closing time;

The time difference between time point t6 and time point t5 is determined to obtain the circuit breaker closing break synchronization quantity.

According to a second aspect of the present invention, a circuit breaker break synchronization measurement device is provided, wherein the circuit breaker comprises a plurality of breaks connected in series between a first node and a second node. The circuit breaker break synchronization measurement device comprises:

The first circuit includes a DC constant voltage source, a resistor and the circuit breaker;

A second circuit, comprising a high-frequency AC power source, an inductor, a capacitor and a second circuit of the circuit breaker;

A coil measurement and control unit, used to control the actions of the closing and opening coils in the circuit breaker in response to closing and opening instructions, so as to achieve closing and opening of the circuit breaker;

Timing unit;

The data acquisition and 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 to send closing and opening instructions to the coil control unit; control the timing unit to perform timing; measure the curve of the voltage change over time between the first node and the second node during the closing and opening of the circuit breaker to obtain a closing voltage waveform and an opening voltage waveform; determine the closing time and the closing synchronization amount based on the closing voltage waveform; determine the opening time and the opening synchronization amount based on the opening voltage waveform.

In one embodiment, the data acquisition processing unit is further used for:

Decomposing the closing voltage waveform into a closing DC voltage portion and a closing AC voltage portion;

The closing time and closing synchronization quantity are determined based on the closing DC voltage part and the closing AC voltage part.

In one embodiment, the data acquisition processing unit is further used for:

Determine the starting power-on time t1 of the closing coil in the circuit breaker through the feedback signal of the coil measurement and control unit;

Determine the sudden drop point of the closing AC voltage part as the closing time point t2 of the first break;

Determine the sudden drop point of the closing DC voltage part as the closing time point t3 of the second break;

Determine the time difference between time point t3 and time point t1 to obtain the circuit breaker closing time;

The time difference between time point t3 and time point t2 is determined to obtain the circuit breaker closing break synchronization quantity.

In one embodiment, the data acquisition processing unit is further used for:

Decomposing the opening voltage waveform into an opening DC voltage portion and an opening AC voltage portion;

The opening time and opening synchronization quantity are determined based on the opening DC voltage part and the opening AC voltage part.

In one embodiment, the data acquisition processing unit is further used for:

Determine the starting power-on time t4 of the opening coil in the circuit breaker by means of the coil measurement and control unit;

Determine the surge mutation point of the opening DC voltage part as the opening time point t5 of the first break;

Determine the surge mutation point of the opening AC voltage part as the closing time point t6 of the second break;

Determine the time difference between time point t6 and time point t4 to obtain the circuit breaker closing time;

The time difference between time point t6 and time point t5 is determined to obtain the circuit breaker closing break synchronization quantity.

The beneficial effect of the present invention is that, compared with the prior art, a high-frequency AC power resonant circuit including a high-frequency AC power supply, a capacitor, an inductor and a circuit breaker is constructed, and a DC power circuit including a DC constant voltage source, a resistor and a circuit breaker is also constructed; wherein the capacitor in the high-frequency power resonant circuit plays the role of isolating the DC power supply, and under the excitation of the high-frequency AC power supply, the high-frequency power voltage at both ends of the circuit breaker can be raised for easy measurement. Through the high-frequency AC power circuit and the DC power circuit, corresponding DC voltage parts and AC voltage parts can be generated in the circuit breaker; by measuring the real-time voltage at both ends of the circuit breaker during closing and opening, the closing voltage waveform and the opening voltage waveform can be obtained. Since the closing voltage waveform and the opening voltage waveform respectively contain the AC voltage part and the DC voltage part at the same time, and the AC voltage part and the DC voltage part will produce different voltage changes during the closing and opening of the circuit breaker, the closing time and the closing synchronization amount can be determined based on the closing voltage waveform, and the opening time and the opening synchronization amount can be determined based on the opening voltage waveform. In short, the present invention can realize the measurement of the closing and opening time amount and the break synchronization amount of the encapsulated circuit breaker, and has a simple structure and is easy to operate.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of a synchronous measurement device for an open circuit breaker in the prior art;

FIG2 is a schematic structural diagram of a circuit breaker encapsulated in a metal cylinder in the prior art;

FIG3 is a flow chart of a circuit breaker break synchronization measurement method in one embodiment of the present application;

FIG. 4 is a schematic diagram of the structure of a circuit breaker break synchronization measurement device in one embodiment of the present application.

Detailed ways

In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only embodiments of a part of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

According to a first aspect of the present invention, a circuit breaker break synchronization measurement method is provided.

In one embodiment, the circuit breaker break synchronization measurement method of the present invention can be used for a circuit breaker including a plurality of breaks connected in series between a first node and a second node. As shown in FIG3 , the method may include the following steps:

Step 1, constructing a first circuit including a constant voltage DC source, a resistor and the circuit breaker.

The first circuit is substantially a DC circuit, so the first circuit usually does not include AC elements such as inductors, capacitors and/or AC power supplies.

Step 2, constructing a second circuit including a high-frequency AC power supply, an inductor, a capacitor and the circuit breaker.

The second circuit is essentially an AC circuit and usually does not include DC power supply elements 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 circuit should be adjustable elements to ensure that the AC circuit can be tuned to achieve subsequent measurements. In addition, the inductance in the second circuit can be either a single inductance or an equivalent inductance of multiple inductors; similarly, the capacitance in the second circuit can be either a single capacitance or an equivalent capacitance of multiple capacitances.

Step 3: Tune the second circuit so that the second circuit reaches a resonant state when the circuit breaker is in an open state after opening.

In this step, tuning the second loop can usually 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 means that all the breakers in the circuit breaker are in the disconnected state.

The resonant state refers to the state in which the capacitive reactance is equal to the inductive reactance in the AC circuit, that is, it satisfies: 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 circuit is in the resonant state, the voltage oscillation amplitude in the circuit reaches the maximum value.

Step 4, respectively closing and opening the circuit breaker, timing during the closing and opening of the circuit breaker and measuring the curve of the voltage between the first node and the second node changing with time to obtain a closing voltage waveform and an opening voltage waveform.

The closing and opening of the circuit breaker can be achieved by controlling the closing coil and the opening coil in the circuit breaker.

The closing and opening period of the circuit breaker may refer to the process from the start of controlling the circuit breaker coil to close and open to the completion of closing and opening.

Furthermore, after the tuning of the second circuit is completed, the frequency, inductance and/or capacitance of the AC voltage source in the second circuit are no longer changed during the closing and opening of the circuit breaker.

Step 5: Determine the closing time and closing synchronization value based on the closing voltage waveform.

The closing time refers to the time from the power-on of the closing coil in the circuit breaker to the closing of all the circuit breakers. The closing synchronization refers to the time from the closing of the first circuit breaker to the closing of all the circuit breakers.

Step 6: Determine the opening time and the opening synchronization value based on the opening voltage waveform.

The opening time refers to the time from the power-on of the opening coil in the circuit breaker to the opening of all the circuit breakers. The opening synchronization refers to the time from the opening of the first circuit breaker to the opening of all the circuit breakers.

In this embodiment, by constructing a first circuit including a high-frequency AC power supply, a capacitor, an inductor and a circuit breaker, and constructing a second circuit including a DC constant voltage source, a resistor and a circuit breaker, the voltage at both ends of the circuit breaker can include both a DC voltage part and an AC voltage part. Further, by measuring the real-time voltage at both ends of the circuit breaker during closing and opening, a closing voltage waveform and an opening voltage waveform are obtained. Since the closing voltage waveform and the opening voltage waveform respectively include an AC voltage part and a DC voltage part, and the AC voltage part and the DC voltage part will produce different voltage changes during the closing and opening of the circuit breaker, the closing time and the closing synchronization amount can be determined based on the closing voltage waveform, and the opening time and the opening synchronization amount can be determined based on the opening voltage waveform.

Furthermore, in step 5, determining the closing time and closing synchronization amount based on the closing voltage waveform further includes:

Step 51, decomposing the closing voltage waveform into a closing DC voltage part and a closing AC voltage part.

The decomposition can be performed by Fourier transform etc. The specific decomposition process will not be described in detail.

Step 52, determining the closing time and the closing synchronization amount based on the closing DC voltage part and the closing AC voltage part.

Since the closing AC voltage part and the closing DC voltage part will produce different voltage changes during the closing of the circuit breaker, the closing time and closing synchronization amount can be determined based on the closing voltage waveform, and the opening time and opening synchronization amount can be determined based on the opening voltage waveform.

Furthermore, in step 52, determining the closing time and the closing synchronization amount based on the closing DC voltage part and the closing AC voltage part further includes:

Step 521, determining the starting power-on time point t1 of the closing coil in the circuit breaker.

Step 522: determine the time point corresponding to when the amplitude reduction of the closing AC voltage portion exceeds a first threshold as the closing time point t2 of the first break.

The amplitude reduction refers to the reduction in the oscillation amplitude of the closing AC voltage part, rather than the reduction in the voltage value. The first threshold value can be set according to actual conditions.

When the first break of the circuit breaker is closed (i.e. short-circuited), the total capacitance of all breaks decreases, causing the second circuit (AC circuit) to be detuned. At this time, the oscillation amplitude of the closing AC voltage part will suddenly drop. Therefore, the closing time point t2 of the first break can be determined by detecting the amplitude drop mutation point of the closing AC voltage part (i.e. the time point when the amplitude reduction exceeds the specific threshold).

Step 523: determine the time point corresponding to when the voltage value of the closing DC voltage portion decreases by more than a second threshold as the closing time point t3 of the second break.

The second threshold value may be set according to actual conditions, and may be equal to the first threshold value or may not be equal to the first threshold value.

When the last break of the circuit breaker is closed (i.e. short-circuited), the total capacitance of all breaks decreases, causing the first circuit (DC circuit) to be turned on. At this time, the voltage value of the closing DC voltage part at both ends of the circuit breaker will suddenly drop. Therefore, the closing time point t3 of the last break, i.e. the time point when all breaks are closed, can be determined by detecting the voltage drop mutation point of the closing DC voltage part (i.e. the time point when the voltage reduction exceeds a specific threshold).

Step 524, determine the time difference between time point t3 and time point t1, and obtain the circuit breaker closing time.

Step 525, determine the time difference between time point t3 and time point t2, and obtain the circuit breaker closing break synchronization value.

In this embodiment, the closing time point t2 of the first break is determined by detecting the amplitude drop mutation point of the closing AC voltage part, and the closing time point t3 of the last break is determined by detecting the voltage drop mutation point of the closing DC voltage part. Combined with the starting power-on time point t1 of the closing coil in the circuit breaker, it is possible to determine the closing time amount and closing break synchronization amount of multiple breaks in the encapsulated circuit breaker.

Furthermore, in step 6, determining the opening time and the opening synchronization amount based on the opening voltage waveform further includes:

Step 61, decomposing the opening voltage waveform into an opening DC voltage part and an opening AC voltage part.

Similar to step 51, decomposition can be performed by Fourier transform, etc. The specific decomposition process will not be described in detail.

Step 62, determining the opening time and the opening synchronization value based on the opening DC voltage part and the opening AC voltage part.

Since the closing AC voltage part and the closing DC voltage part will produce different voltage changes during the closing of the circuit breaker, the closing time and closing synchronization amount can be determined based on the closing voltage waveform, and the opening time and opening synchronization amount can be determined based on the opening voltage waveform.

Further, in step 62, determining the opening time and the opening synchronization amount based on the opening DC voltage part and the opening AC voltage part also includes:

Step 621, determining the starting power-on time t4 of the opening coil in the circuit breaker.

Step 622: determine the time point corresponding to when the amplitude increase of the opening DC voltage portion exceeds a first threshold as the opening time point t5 of the first break.

The amplitude increase refers to the oscillation amplitude increase of the closing AC voltage part, rather than the voltage increase. The first threshold value can be set according to actual conditions.

When the first break of the circuit breaker is opened (disconnected), the total capacitance of all breaks increases, causing the first circuit (DC circuit) to be disconnected. At this time, the voltage value of the closing DC voltage part at both ends of the circuit breaker will suddenly increase. Therefore, the opening time point t5 of the first break can be determined by detecting the voltage value surge mutation point of the closing DC voltage part (that is, the time point when the voltage value increase exceeds the specific threshold).

Step 623, determining the time point corresponding to when the voltage value increase of the opening AC voltage part exceeds the second threshold as the closing time point t6 of the second break.

The second threshold value may be set according to actual conditions, and may be equal to the first threshold value or may not be equal to the first threshold value.

When the last break of the circuit breaker is opened (disconnected), the second circuit (AC circuit) is in a resonant state. At this time, the oscillation amplitude of the opening AC voltage part at both ends of the circuit breaker will suddenly increase. Therefore, the opening time point t6 of the last break, that is, the time point when all breaks are opened, can be determined by detecting the amplitude surge mutation point of the opening AC voltage part (that is, the time point when the amplitude increase exceeds a specific threshold).

Step 624, determine the time difference between time point t6 and time point t4, and obtain the circuit breaker opening time.

Step 625, determine the time difference between time point t6 and time point t5, and obtain the circuit breaker opening fault synchronization value.

In this embodiment, the opening time point t5 of the first break is determined by detecting the voltage surge mutation point of the opening DC voltage part, and the opening time point t6 of the last break is determined by detecting the amplitude surge mutation point of the opening AC voltage part. Combined with the starting power-on time point t4 of the opening coil in the circuit breaker, it is possible to determine the opening time and opening break synchronization of multiple breaks in the encapsulated circuit breaker.

According to a second aspect of the present invention, there is provided a circuit breaker break synchronization measuring device, wherein the circuit breaker comprises a plurality of breaks connected in series between a first node and a second node.

As shown in FIG4 , in one embodiment, the circuit breaker break synchronization measuring device of the present invention comprises:

The first circuit includes a DC constant voltage source, a resistor and the circuit breaker;

A second circuit, comprising a high-frequency AC power supply, an inductor, a capacitor and a second circuit of the circuit breaker;

A coil measurement and control unit, used to control the actions of the closing and opening coils in the circuit breaker in response to closing and opening instructions, so as to achieve closing and opening of the circuit breaker;

Timing unit;

The data acquisition and 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 to send closing and opening instructions to the coil control unit; control the timing unit to perform timing; measure the curve of the voltage change over time between the first node and the second node during the closing and opening of the circuit breaker to obtain a closing voltage waveform and an opening voltage waveform; determine the closing time and the closing synchronization amount based on the closing voltage waveform; determine the opening time and the opening synchronization amount based on the opening voltage waveform.

In this embodiment, by constructing a first circuit including a high-frequency AC power supply, a capacitor, an inductor and a circuit breaker, and constructing a second circuit including a DC constant voltage source, a resistor and a circuit breaker, the voltage at both ends of the circuit breaker can include both a DC voltage part and an AC voltage part. Further, the coil measurement and control unit is controlled by the data acquisition processing unit to realize the closing and opening of the circuit breaker, the timing unit is controlled by the data acquisition processing unit to perform timing, and the real-time voltage at both ends of the circuit breaker during closing and opening is measured by the data acquisition processing unit to obtain the closing voltage waveform and the opening voltage waveform. Since the closing voltage waveform and the opening voltage waveform respectively contain the AC voltage part and the DC voltage part at the same time, and the AC voltage part and the DC voltage part will produce different voltage changes during the closing and opening of the circuit breaker, the closing time and the closing synchronization amount can be determined based on the closing voltage waveform, and the opening time and the opening synchronization amount can be determined based on the opening voltage waveform.

Preferably, the first circuit does not include AC elements such as inductance, capacitance and/or AC power supply.

Preferably, no DC power supply elements such as a DC constant voltage source are included. At the same time, one or more of the high-frequency AC power supply, inductance and capacitance in the second circuit should be adjustable elements to ensure that the AC circuit can be tuned to achieve subsequent measurements.

Furthermore, the inductor in the second loop may be a single inductor or an equivalent inductor of multiple inductors; similarly, the capacitor in the second loop may be a single capacitor or an equivalent capacitor of multiple capacitors.

Preferably, the timing unit is a crystal oscillator timing unit, and the frequency of the high-frequency AC power supply is greater than the crystal oscillator frequency of the timing unit to ensure the accuracy and precision of subsequent measurements.

Furthermore, the data acquisition and processing unit is also used for:

Decomposing the closing voltage waveform into a closing DC voltage portion and a closing AC voltage portion;

The closing time and closing synchronization quantity are determined based on the closing DC voltage part and the closing AC voltage part.

Furthermore, the data acquisition and processing unit is also used for:

Determine the starting power-on time t1 of the closing coil in the circuit breaker through the feedback signal of the coil measurement and control unit;

Determine the time point corresponding to when the amplitude reduction amount of the closing AC voltage part exceeds the first threshold as the closing time point t2 of the first break;

Determine the time point corresponding to when the voltage value of the closing DC voltage part decreases by more than a second threshold as the closing time point t3 of the second break;

Determine the time difference between time point t3 and time point t1 to obtain the circuit breaker closing time;

The time difference between time point t3 and time point t2 is determined to obtain the circuit breaker closing break synchronization quantity.

Furthermore, the data acquisition and processing unit is also used for:

Decomposing the opening voltage waveform into an opening DC voltage portion and an opening AC voltage portion;

The opening time and opening synchronization quantity are determined based on the opening DC voltage part and the opening AC voltage part.

Furthermore, the data acquisition and processing unit is also used for:

Determine the starting power-on time t4 of the opening coil in the circuit breaker by means of the coil measurement and control unit;

Determine the time point corresponding to when the amplitude increase of the opening DC voltage portion exceeds the first threshold as the opening time point t5 of the first break;

Determine the time point corresponding to when the voltage value increase of the opening AC voltage part exceeds the second threshold as the closing time point t6 of the second break;

Determine the time difference between time point t6 and time point t4 to obtain the circuit breaker closing time;

The time difference between time point t6 and time point t5 is determined to obtain the circuit breaker closing break synchronization quantity.

The beneficial effect of the present invention is that, compared with the prior art, it can realize the measurement of the opening and closing time and the opening and closing break synchronization of the encapsulated circuit breaker, and has a simple structure and is easy to operate.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims (10)

1. A method for synchronously measuring a circuit breaker break, wherein the circuit breaker comprises a plurality of breaks connected in series between a first node and a second node, characterized in that it comprises: Constructing a first circuit including a DC constant voltage source, a resistor and the circuit breaker; Constructing a second circuit including a high-frequency AC power source, an inductor, a capacitor and the circuit breaker; Tuning the second circuit so that the second circuit reaches a resonant state when the circuit breaker is in an open state after opening; Closing and opening the circuit breaker are respectively performed, timing is performed during the closing and opening of the circuit breaker, and a curve of the voltage between the first node and the second node changing with time is measured to obtain a closing voltage waveform and an opening voltage waveform; Determining the closing time and closing synchronization amount based on the closing voltage waveform; The opening time and the opening synchronization amount are determined based on the opening voltage waveform. 2. The circuit breaker break synchronization measurement method according to claim 1, characterized in that the determining the closing time and closing synchronization amount based on the closing voltage waveform comprises: Decomposing the closing voltage waveform into a closing DC voltage portion and a closing AC voltage portion; The closing time and closing synchronization quantity are determined based on the closing DC voltage part and the closing AC voltage part. 3. The circuit breaker break synchronization measurement method according to claim 2, characterized in that the determining of the closing time and the closing synchronization value based on the closing DC voltage part and the closing AC voltage part comprises: Determine the starting power-on time t1 of the closing coil in the circuit breaker; Determine the time point corresponding to when the amplitude reduction amount of the closing AC voltage part exceeds the first threshold as the closing time point t2 of the first break; Determine the time point corresponding to when the voltage value of the closing DC voltage part decreases by more than a second threshold as the closing time point t3 of the second break; Determine the time difference between time point t3 and time point t1 to obtain the circuit breaker closing time; The time difference between time point t3 and time point t2 is determined to obtain the circuit breaker closing break synchronization quantity. 4. The circuit breaker break synchronization measurement method according to claim 1, characterized in that the determining of the opening time and the opening synchronization value based on the opening voltage waveform comprises: Decomposing the opening voltage waveform into an opening DC voltage portion and an opening AC voltage portion; The opening time and opening synchronization quantity are determined based on the opening DC voltage part and the opening AC voltage part. 5. The circuit breaker break synchronization measurement method according to claim 4, characterized in that the determining of the opening time and the opening synchronization value based on the opening DC voltage part and the opening AC voltage part comprises: Determine the starting power-on time t4 of the opening coil in the circuit breaker; Determine the time point corresponding to when the amplitude increase of the opening DC voltage portion exceeds the first threshold as the opening time point t5 of the first break; Determine the time point corresponding to when the voltage value increase of the opening AC voltage part exceeds the second threshold as the closing time point t6 of the second break; Determine the time difference between time point t6 and time point t4 to obtain the circuit breaker closing time; The time difference between time point t6 and time point t5 is determined to obtain the circuit breaker closing break synchronization quantity. 6. A circuit breaker break synchronization measuring device, wherein the circuit breaker comprises a plurality of breaks connected in series between a first node and a second node, characterized in that it comprises: The first circuit includes a DC constant voltage source, a resistor and the circuit breaker; A second circuit, comprising a high-frequency AC power source, an inductor, a capacitor and a second circuit of the circuit breaker; A coil measurement and control unit, used to control the actions of the closing and opening coils in the circuit breaker in response to closing and opening instructions, so as to achieve closing and opening of the circuit breaker; Timing unit; The data acquisition and 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 to send closing and opening instructions to the coil control unit; control the timing unit to perform timing; measure the curve of the voltage change over time between the first node and the second node during the closing and opening of the circuit breaker to obtain a closing voltage waveform and an opening voltage waveform; determine the closing time and the closing synchronization amount based on the closing voltage waveform; determine the opening time and the opening synchronization amount based on the opening voltage waveform. 7. The circuit breaker break synchronization measurement device according to claim 6, characterized in that the data acquisition and processing unit is also used for: Decomposing the closing voltage waveform into a closing DC voltage portion and a closing AC voltage portion; The closing time and closing synchronization quantity are determined based on the closing DC voltage part and the closing AC voltage part. 8. The circuit breaker break synchronization measurement device according to claim 7, characterized in that the data acquisition processing unit is also used for: Determine the starting power-on time t1 of the closing coil in the circuit breaker through the feedback signal of the coil measurement and control unit; Determine the time point corresponding to when the amplitude reduction amount of the closing AC voltage part exceeds the first threshold as the closing time point t2 of the first break; Determine the time point corresponding to when the voltage value of the closing DC voltage part decreases by more than a second threshold as the closing time point t3 of the second break; Determine the time difference between time point t3 and time point t1 to obtain the circuit breaker closing time; The time difference between time point t3 and time point t2 is determined to obtain the circuit breaker closing break synchronization quantity. 9. The circuit breaker break synchronization measurement device according to claim 6, characterized in that the data acquisition and processing unit is also used for: Decomposing the opening voltage waveform into an opening DC voltage portion and an opening AC voltage portion; The opening time and opening synchronization quantity are determined based on the opening DC voltage part and the opening AC voltage part. 10. The circuit breaker break synchronization measurement device according to claim 9, characterized in that the data acquisition processing unit is also used for: Determine the starting power-on time t4 of the opening coil in the circuit breaker by means of the coil measurement and control unit; Determine the time point corresponding to when the amplitude increase of the opening DC voltage portion exceeds the first threshold as the opening time point t5 of the first break; Determine the time point corresponding to when the voltage value increase of the opening AC voltage part exceeds the second threshold as the closing time point t6 of the second break; Determine the time difference between time point t6 and time point t4 to obtain the circuit breaker closing time; The time difference between time point t6 and time point t5 is determined to obtain the circuit breaker closing break synchronization quantity.