CN116026292B - Breaker travel track reproduction device and method based on three-eye imaging principle - Google Patents

Abstract

The invention relates to a circuit breaker travel track reappearance device and method based on the principle of trinocular imaging. The start switch of the trinocular imager is connected to the opening coil or closing coil of the circuit breaker, and the termination switch of the trinocular imager is connected to the circuit breaker. On the secondary wiring of the current transformer connected to the circuit breaker, it can be photographed according to the flow time of the opening coil or the closing coil, and at the same time, it will be terminated at the moment of the primary current of the circuit breaker. The captured trajectory is input to the diagnostic machine to calculate the phase The closing time difference between them can be used to obtain the synchronism of the circuit breaker and the speed of the circuit breaker during the movement. The invention can effectively improve the test efficiency of the mechanical characteristics of the circuit breaker. On the one hand, it can save more than 90% of the time of the response test during the handover test, and at the same time avoid the danger of a high-altitude connection. When it is working, it can also measure the mechanical characteristics of the circuit breaker, so that there is no need to cut off the power of the equipment and remove the lead wires, which fills the measurement gap under the operating condition.

Description

Circuit breaker travel trajectory reproduction device and method based on trinocular imaging principle

technical field

The invention belongs to the technical field of abnormal defect diagnosis of transformers, in particular to a trip track reappearance device and method for a circuit breaker based on the trinocular imaging principle.

Background technique

At present, the abnormal defects of circuit breaker mechanism and transmission have become the most important factors affecting the reliable operation of circuit breakers. How to effectively detect the defects of circuit breaker mechanism and transmission in advance is very important. The traditional mechanical performance detection method includes mechanical characteristic test and opening and closing coil current test, but the mechanical characteristic test needs to be carried out in the state of equipment power failure, and the control ability is slightly insufficient under the current operation and maintenance mode of non-essential non-stop power supply, such as 110 thousand Under normal conditions, the circuit breaker only needs to be repaired once every 7 years after a power outage, and the test is complicated, and the field completion degree is not high, especially the opening and closing speed tests are often ignored; while the opening and closing coil current test can only indirectly reflect part of the mechanism Jamming problem, defect detection is not comprehensive, such as loose contacts, and key parameters such as circuit breaker opening and closing time, synchronization and speed cannot be intuitively given. Therefore, how to realize the mechanical performance test of the circuit breaker in a non-blackout and non-contact state, reduce the difficulty of detection, increase the frequency of detection, and strengthen the level of control is of great significance to ensure the safe and stable operation of the circuit breaker.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and propose a circuit breaker travel trajectory reproduction device and method based on the trinocular imaging principle, which can realize the effective reproduction of the circuit breaker mechanical stroke and the basis for the detection and calculation of key parameters of mechanical characteristics On the one hand, it effectively improves the test efficiency and reduces the difficulty of the test.

The present invention solves its technical problem and realizes by taking the following technical solutions:

A circuit breaker travel trajectory reproduction device based on the principle of trinocular imaging, connected to the circuit breaker, including a trinocular imager, a diagnostic machine and test wiring, the start switch of the trinocular imager is connected to the circuit breaker through the first test wiring The opening coil or closing coil is used to control the start switch at the moment of inductive opening coil or closing coil, and then control the time when the trinocular imager starts shooting. The termination switch of the trinocular imager is connected through the second test Connect to the secondary wiring of the current transformer connected to the circuit breaker, which is used to control the stop switch when the primary current of the circuit breaker is turned on and off, and then control the time when the trinocular imager stops shooting, and the trinocular imager is connected to the diagnostic machine.

Also, the test wiring includes a small ammeter.

A method for reproducing a circuit breaker travel trajectory reproducing device based on the trinocular imaging principle, including measuring the closing process and the opening process.

Moreover, the closing process includes the following steps:

Step 1.1. Connect the start switch of the trinocular imager to the closing coil of the circuit breaker through the first test wiring, and connect the stop switch of the trinocular imager to the secondary of the current transformer connected to the circuit breaker through the second test wiring. on the wiring;

Step 1.2, when the first test wiring induction closing coil flows at time t1, the trinocular imager starts shooting;

Step 1.3, when the primary current flow time of the second test wiring induction circuit breaker is t2, the trinocular imager stops shooting;

Step 1.4, the closing time is obtained as t _close =t2-t1;

Step 1.5, repeat steps 1.1 to 1.4 until the movement trajectory of the three-connected rods of phase A, B and C of the circuit breaker is completed, and the trinocular imager will send the captured movement trajectory of the connecting rods to the diagnostic machine to obtain the three-phase contacts of the circuit breaker. Travel trajectory, by calculating the closing time difference between phases, the synchronism of the circuit breaker and the speed of the circuit breaker during motion can be obtained.

And, described break-off process comprises the following steps:

Step 2.1. Connect the start switch of the trinocular imager to the opening coil of the circuit breaker through the first test wiring, and connect the stop switch of the trinocular imager to the secondary of the current transformer connected to the circuit breaker through the second test wiring. on the wiring;

Step 2.2, when the first test wiring induction opening coil flows at time t3, the trinocular imager starts to shoot;

Step 2.3, when the primary current flow time of the second test wiring induction circuit breaker is t4, the trinocular imager stops shooting;

Step 2.4, obtain the opening time as t _minutes =t4-t3;

Step 2.5, repeat steps 2.1 to 2.4 until the movement trajectory of the three-connected rods of phase A, B and C of the circuit breaker is completed, and the trinocular imager will send the captured movement trajectory of the connecting rods to the diagnostic machine to obtain the three-phase contacts of the circuit breaker. Travel trajectory, by calculating the opening time difference between each phase, the synchronism of the circuit breaker and the speed of the circuit breaker during motion can be obtained.

Moreover, the specific implementation method of the speed of the circuit breaker in the motion process in step 1.5 and step 2.56 is:

The speed of the circuit breaker just after opening is the average speed of the circuit breaker within 0.01s after the opening:

, where L1 is the travel track of the circuit breaker contact within 0.01s immediately after the break;

The opening speed of the circuit breaker is the ratio of the stroke to time during the opening process:

, where L3 is the travel track of the circuit breaker contact taken by the trinocular imager at the opening time;

The circuit breaker just closing speed is the average speed of the circuit breaker within 0.01s before just closing:

, where L1 is the travel track of the circuit breaker contact within 0.01s immediately after the break;

The closing speed of the circuit breaker is the average speed within the action time during the closing process:

, the four speeds are obtained through the trinocular imager, and then the travel trajectory of the circuit breaker contact is obtained.

Moreover, the reappearance method of circuit breaker synchronism in step 1.5 and step 1.6 is: closing synchronism is the time difference between the three-phase closing times t _{close A} , t _{close B} , and t _{close C} , and opening synchronism is The time difference between the three-phase opening time _tminA , _tminB and _tminC .

Advantage and positive effect of the present invention are:

The start switch of the trinocular imager of the present invention is connected to the opening coil or closing coil of the circuit breaker through the first test wiring, and the termination switch of the trinocular imager is connected to the current transformer connected to the circuit breaker through the second test wiring. In the secondary wiring, it can be photographed according to the current flow time of the opening coil or the closing coil, and at the same time, it will be terminated at the time when the primary current of the circuit breaker is on and off. Travel trajectory, by calculating the closing time difference between phases, the synchronism of the circuit breaker and the speed of the circuit breaker during motion can be obtained. The invention can effectively improve the test efficiency of the mechanical characteristics of the circuit breaker. On the one hand, it can save more than 90% of the time of the response test during the handover test, and at the same time avoid the danger of a high-altitude connection. When it is working, it can also measure the mechanical characteristics of the circuit breaker, so that there is no need to cut off the power of the equipment and remove the lead wires, which fills the measurement gap under the operating condition.

Description of drawings

Fig. 1 is a structural diagram of the present invention;

Fig. 2 is the curve diagram that circuit breaker closing of the present invention forms;

Fig. 3 is a principle diagram of trinocular imaging in the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

The circuit breaker travel trajectory reproduction device based on the principle of trinocular imaging, as shown in Figure 1, is connected to the circuit breaker, including a trinocular imager, a diagnostic machine and test wiring (including a small ammeter). The initial switch is connected to the opening coil or closing coil of the circuit breaker through the first test wiring, and is used to control the initial switch at the moment of inductive opening coil or closing coil, which is used as the shooting trigger time of the trinocular imager, that is, the circuit breaker At the beginning of the action of the circuit breaker, the termination switch of the trinocular imager is connected to the secondary connection of the current transformer connected to the circuit breaker through the second test wiring, which is used to control the termination switch when the primary current of the circuit breaker is turned on and off, as a trinocular The stop moment of the imager's shooting, that is, the termination moment of the circuit breaker. The trinocular imager is connected to the diagnostic machine.

For example, when measuring the closing process of a circuit breaker, the first test wiring is connected to the closing coil of the circuit breaker, and the moment t1 of the induction closing coil is passed, the second test wiring is connected to the secondary wiring of the current transformer, and the primary current of the induction circuit breaker is The flow time is t2, and the closing time _is t = t2-t1. Similarly, when measuring the opening process of the circuit breaker, the first test wiring is connected to the opening coil of the circuit breaker, and the induction opening coil flows at time t3, the second test wiring is connected to the secondary wiring of the current transformer, and the induction circuit breaker once The current interruption time is t4, and the opening time is _tmin =t4-t3. After shooting the movement trajectory of the three connecting rods of the circuit breaker, the travel trajectory of the three-phase contacts of the circuit breaker can be known. By calculating The opening and closing time difference of the _{circuit breaker} can be used to obtain the synchronism of the circuit breaker, as well as the speed of the circuit breaker in the process of movement _. , and the opening synchronism is the time difference between the three-phase opening times tmin _A , tmin _B and tmin _C.

A method for reproducing a circuit breaker travel trajectory reproducing device based on the trinocular imaging principle, including measuring the closing process and the opening process.

Among them, the closing process includes the following steps:

Step 1.1. Connect the start switch of the trinocular imager to the closing coil of the circuit breaker through the first test wiring, and connect the stop switch of the trinocular imager to the secondary of the current transformer connected to the circuit breaker through the second test wiring. on the wire.

Step 1.2. When the first test wiring induction closing coil passes the current moment t1, the trinocular imager starts to shoot.

Step 1.3, when the primary current flow time of the second test connection induction circuit breaker is t2, the trinocular imager stops shooting.

In step 1.4, the closing time is obtained as _tclose =t2-t1.

Step 1.5, repeat steps 1.1 to 1.4 until the movement trajectory of the three-connected rods of phase A, B and C of the circuit breaker is completed, and the trinocular imager will send the captured movement trajectory of the connecting rods to the diagnostic machine to obtain the three-phase contacts of the circuit breaker. Travel trajectory, by calculating the closing time difference between phases, the synchronism of the circuit breaker and the speed of the circuit breaker during motion can be obtained.

Wherein, the opening process includes the following steps:

Step 2.1. Connect the start switch of the trinocular imager to the opening coil of the circuit breaker through the first test wiring, and connect the stop switch of the trinocular imager to the secondary of the current transformer connected to the circuit breaker through the second test wiring. on the wire.

Step 2.2, when the first test wiring induction opening coil flows through the moment t3, the trinocular imager starts to shoot.

Step 2.3, when the primary current flow time of the second test connection induction circuit breaker is t4, the trinocular imager stops shooting.

In step 2.4, the opening time is obtained as _tmin =t4-t3.

Step 2.5, repeat steps 2.1 to 2.4 until the movement trajectory of the three-connected rods of phase A, B and C of the circuit breaker is completed, and the trinocular imager will send the captured movement trajectory of the connecting rods to the diagnostic machine to obtain the three-phase contacts of the circuit breaker. Travel trajectory, by calculating the opening time difference between each phase, the synchronism of the circuit breaker and the speed of the circuit breaker during motion can be obtained.

As shown in Figure 2, the specific implementation method of the speed of the circuit breaker during the movement in step 1.5 and step 2.56 is:

The speed of the circuit breaker just after opening is the average speed of the circuit breaker within 0.01s after the opening:

, where L1 is the travel track of the circuit breaker contact within 0.01s immediately after the break;

The opening speed of the circuit breaker is the ratio of the stroke to time during the opening process:

, where L3 is the travel track of the circuit breaker contact taken by the trinocular imager at the opening time;

The circuit breaker just closing speed is the average speed of the circuit breaker within 0.01s before just closing:

, where L1 is the travel track of the circuit breaker contact within 0.01s immediately after the break;

The closing speed of the circuit breaker is the average speed within the action time during the closing process:

, the four speeds are obtained through the trinocular imager, and then the travel trajectory of the circuit breaker contact is obtained.

As shown in Figure 3, the principle of the trinocular imager used in the present invention is: to overcome the shooting errors caused by human factors such as different shooting techniques and different shooting distances of different people, and to shoot by three cameras, the self between the three cameras If the angular position relationship is known, then the actual action stroke of the connecting rod (that is, the contact head) will be calculated objectively. The specific calculation method is as follows (see Figure 3). Assuming that only a single camera A is used (Figure 3a), the projection of the actual object stroke CD on the camera is AC and AD, but only the length of the two sides is used, and the third side CD cannot be calculated. , so another camera B (Fig. 3b) needs to be added, and the distance AB between AB and CAB, that is, the projection of CD on camera B is CB and DB, according to the law of cosines: , calculated in triangle CAB to get /> CBA, get /> in triangle ABD ABD, ABD-/> CBA can be obtained /> DBC, CD can be obtained in the triangle DBC, that is, the actual object travel. The reason why the third camera is added is, on the one hand, to improve the accuracy of the measurement for the calculation between two cameras, and on the other hand, to ensure that the other two can get effective travel when there is a problem with one camera. The reliability of the set.

It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive, so the present invention includes and is not limited to the embodiments described in the specific implementation, and those skilled in the art according to the technology of the present invention Other implementations derived from the scheme also belong to the protection scope of the present invention.

Claims (3)

1. The reproduction method of the circuit breaker travel track reproduction device based on the three-eye imaging principle is characterized in that the reproduction device is connected with the circuit breaker and is characterized in that: the reproduction device comprises a three-eye imager, a diagnostic machine and a test wiring, wherein an initial switch of the three-eye imager is connected with a switching-off coil or a switching-on coil of a circuit breaker through a first test wiring, is used for sensing the current moment of the switching-off coil or the switching-on coil to control the initial switch, further controlling the shooting starting time of the three-eye imager, and a terminal switch of the three-eye imager is connected with a secondary wiring of a current transformer connected with the circuit breaker through a second test wiring, is used for sensing the primary current on-off moment of the circuit breaker to control the terminal switch, further controlling the shooting stopping time of the three-eye imager, and is connected with the diagnostic machine; the test wiring comprises a small ammeter;

the reproduction method comprises the steps of measuring a closing process and a separating process;

the closing process comprises the following steps:

step 1.1, connecting an initial switch of a three-eye imager with a closing coil of a circuit breaker through a first test wiring, and connecting a terminal switch of the three-eye imager with a secondary wiring of a current transformer connected with the circuit breaker through a second test wiring;

step 1.2, when the through-flow time t1 of the induction closing coil of the first test wiring is reached, the three-eye imager starts shooting;

step 1.3, stopping shooting by the three-eye imager when the primary current of the second test wiring induction circuit breaker is in the time t 2;

step 1.4, obtaining the closing time t _{Closing device} =t2-t1；

Step 1.5, repeating the steps 1.1 to 1.4 until the action tracks of the three-phase connecting rods of the phase A, the phase B and the phase C of the circuit breaker are completed, sending the shot action tracks of the connecting rods to a diagnostic machine by a three-eye imaging device to obtain the travel tracks of the three-phase contacts of the circuit breaker, and obtaining the synchronism of the circuit breaker and the speed of the circuit breaker in the moving process by calculating the switching-on time difference between the phases;

the brake separating process comprises the following steps:

step 2.1, connecting an initial switch of the three-eye imager with a brake-separating coil of a circuit breaker through a first test wiring, and connecting a terminal switch of the three-eye imager with a secondary wiring of a current transformer connected with the circuit breaker through a second test wiring;

step 2.2, when the first test wiring induction switching-off coil current moment t3, shooting by the three-eye imager;

step 2.3, stopping shooting by the three-eye imager when the primary current of the second test wiring induction circuit breaker is in the time t 4;

step 2.4, obtaining the opening time t _{Dividing into} =t4-t3；

And 2.5, repeating the steps 2.1 to 2.4 until the action tracks of the three-phase connecting rods of the phase A, the phase B and the phase C of the circuit breaker are completed, sending the shot action tracks of the connecting rods to a diagnostic machine by a three-eye imaging device to obtain the travel tracks of the three-phase contacts of the circuit breaker, and obtaining the synchronism of the circuit breaker and the speed of the circuit breaker in the moving process by calculating the opening time difference between the phases.

2. The reproduction method of the circuit breaker travel track reproduction apparatus based on the three-dimensional imaging principle according to claim 1, wherein: the specific calculation method of the speed of the breaker in the movement process in the step 1.5 and the step 2.5 comprises the following steps:

the breaker just-divided speed is the average speed of the breaker within 0.01s just after the division:

wherein, the method comprises the steps of, wherein,L1 is the travel track of the breaker contact within 0.01s immediately after separation;

the breaking speed of the breaker is the ratio of travel to time in the breaking process:

wherein, the method comprises the steps of, wherein,L3, shooting a travel track of a breaker contact at the opening time by a three-eye imager;

the breaker closing speed is the average speed of the breaker within 0.01s just before closing:

wherein, the method comprises the steps of, wherein,L1 is the travel track of the breaker contact within 0.01s immediately after separation;

the closing speed of the circuit breaker is the average speed in the action time in the closing process:

four speeds are obtained through a three-eye imager, and then the travel track of the breaker contact is obtained.

3. The reproduction method of the circuit breaker travel track reproduction apparatus based on the three-dimensional imaging principle according to claim 1, wherein: the method for reproducing the synchronization of the interrupt circuit breakers in the step 1.5 and the step 2.5 comprises the following steps: the closing synchronism is three-phase closing time t _{He A} 、t _{He B} 、t _{C combination} The time difference between the two is the three-phase brake-separating time t _{Divide A} 、t _{B part} 、t _{C part} Time difference between them.