CN102650557A - Moment measuring device for circuit breaker body - Google Patents

Abstract

The invention relates to a moment measuring device for a circuit breaker body. The moment measuring device comprises a force transducer and a driving mechanism of which one end is used for being connected with an outer crank arm of a circuit breaker, wherein the other end of the driving mechanism is fixedly connected with the input end of the force transducer. The moment during the process of two limit positions of brake separating and closing of the qualified circuit breaker verified by tests is selected as a research object and relevant mechanical principles are combined to measure the moment of a main crank arm of the circuit breaker in the motion process and a standard characteristic curve is drawn for guiding subsequently-operated debugging work of a 800kV circuit breaker body and judging whether the assembly characteristics of the circuit breaker meet the work requirements or not, and thus the debugging time is shortened, the assembly and detection level of the circuit breaker are improved and the characteristics of the circuit breaker are improved.

Description

A torque measuring device for a circuit breaker body

technical field

The invention relates to a high-voltage switchgear, in particular to an 800kV GIS circuit breaker and a tank-type circuit breaker main body torque measuring device used in the high-voltage switchgear. the

Background technique

The long-term stable operation of the circuit breaker is very important, but the debugging of the characteristics of the circuit breaker body has been a complicated and difficult task for a long time. The assembly performance after debugging can only be verified by a series of tests, which takes a long period. Therefore, there is now a need for an indirect way to measure the torque characteristics of the circuit breaker body. For the circuit breakers that have been verified by the test, measure the torque characteristics, and draw the circuit breaker opening and closing characteristic curves to compare the characteristics of the newly assembled circuit breaker. Preliminary Judging whether the assembly characteristics of the circuit breaker meet the work requirements, judging the problem parts that do not meet the characteristics, and debugging in a targeted manner, speeding up the purpose and accuracy of the circuit breaker characteristic debugging. the

Contents of the invention

The purpose of the present invention is to provide a torque measuring device for the circuit breaker body, which is used to measure the torque characteristics of the circuit breaker, preliminarily judge whether the assembly characteristics of the circuit breaker meet the work requirements, judge the problem parts that do not meet the characteristics, and carry out targeted debugging. Accelerates the purposefulness and accuracy of circuit breaker characterization commissioning. the

In order to achieve the above object, the solution of the present invention is to include a load cell and a transmission mechanism with one end used to connect with the outer crank arm of the circuit breaker, and the other end of the transmission mechanism is fixedly connected to the input end of the load cell. the

The torque measuring device of the circuit breaker body is made of steel material, the device is equipped with a sensor, and one end is connected with the display device, which can monitor the torque status in real time and is easy to use. Select the torque in the middle process of the opening and closing two extreme positions of the circuit breaker that has been verified by the test as the research object, combine the relevant mechanical principles, measure the torque of the main arm of the circuit breaker in the process of movement in real time and draw the standard characteristics The curve is used to guide the commissioning of the 800kV circuit breaker body in the future, and judge whether the assembly characteristics of the circuit breaker meet the work requirements, thereby reducing the commissioning time, improving the assembly and detection level of the circuit breaker, and improving the characteristics of the circuit breaker. the

Further, the load cell is output through a conversion circuit and connected to a display device for displaying the measured value of the sensor. the

Further, the transmission mechanism includes a screw, one end of the screw is fixedly connected to the input end of the load cell, and the other end of the screw is detachably connected to a main crank arm through a nut, and the main crank arm is hinged to the outer crank arm of the circuit breaker. the

Description of drawings

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

Figure 2 is a torque curve diagram.

Detailed ways

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

LW55-800 tank-type sulfur hexafluoride circuit breaker and ZF27-800(L) gas-insulated metal-enclosed switchgear are outdoor three-phase AC 50Hz ultra-high voltage power transmission equipment, which are used in power systems with a rated voltage of 750kV. Line control, measurement, protection and switching. the

The torque measuring device of the 800kV circuit breaker body as shown in Figure 1 includes a screw 1, one end of the screw 1 is fixedly connected to the load cell 4, and a nut 2 is screwed on the screw 1 (the position of the nut 2 can be adjusted as required), and the nut 2 is the same as The shaft is connected with a tubular main crank arm 10, and the main crank arm 10 is provided with a pivot pin 9, which is hinged with the outer crank arm 3 of the circuit breaker. The load cell 4 is connected to a display device 14 through a conversion circuit output, and the measured value is displayed in real time. The load cell can be a load cell, a spring load cell, etc., and a digital load cell is used here. During use, the moment measuring device is installed on a support frame as shown in the figure, and the load cell 4 is fixed on the support frame with pins 11, and slide blocks 12, 13 are provided at the upper and lower ends of the support frame. The function of slide blocks 12 and 13 is to fix the torque measuring device on the circuit breaker body, which is convenient for adjusting the position left and right when assembling the torque measuring tooling frame. the

Test preparation: Make the circuit breaker that is qualified by the test be in the opening state, remove the oil pressure, and mark the closing position, opening position, just-closing position, and just-opening position of the outer crank arm on the crank arm box with a marker pen. position, etc., remove the shaft pin connected with the main crank arm. Without assembling the side door of the mechanism box, install the main body of the torque measuring device of the 800kV circuit breaker body and the upper and lower sliders on the supporting frame, and connect them to the outer crank arm. Connect the sensor and the display device, the display device is a digital display device, and connect the 220V power supply for the sensor. the

Closing torque measurement: run the torque measuring device at a constant speed, so that the outer crank arm in the opening position slowly turns to the closing position, and observe the digital display device. At this time, the torque is relatively stable. Record the first set of data. Just at the close point, the torque increases suddenly, and then becomes stable again. Observe this process and record the second set of data. When the outer crank arm is turned to the closing position, the test is stopped, and the third set of data is recorded. the

Opening torque measurement: run the torque measuring device at a constant speed, so that the outer crank arm in the closing position slowly turns to the opening position, and observe the digital display device. At this time, the torque is relatively stable. Record the fourth set of data. Just at the minute, the torque suddenly decreases, and then becomes stable again. Observe this process and record the fifth set of data. When the outer crank arm turns to the opening position, the test is stopped, and the sixth set of data is recorded. the

Repeat the above test several times, draw the characteristic curve according to the recorded data. the

It is used as a standard characteristic curve to judge whether the characteristics of the new circuit breaker meet the working requirements. As shown in Figure 2 is a characteristic curve. the

Claims (3)

1. a breaker body dynamometry moment device is characterized in that, comprises that a force cell and an end are used for the gear train that is connected with the outer connecting lever of isolating switch, the be connected input end of said force cell of the other end of this gear train.

2. a kind of breaker body dynamometry moment device according to claim 1 is characterized in that, said force cell connects a display device that is used to show measurement value sensor through a change-over circuit output.

3. a kind of breaker body dynamometry moment device according to claim 1; It is characterized in that; Said gear train comprises a screw rod; Screw rod one end is fixedly connected the input end of said force cell, and the screw rod other end is through the nut main connecting lever that removably connects, the outer connecting lever of the hinged said isolating switch of main connecting lever.

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