CN102818988B - The test device system of earth-fault current or residual current circuit breaker - Google Patents

Abstract

The content of the present invention is a test device system for ground fault current or residual current circuit breaker. The test device system includes a test circuit and a display device. The test circuit is used to check the action of the circuit breaker when the ground fault current or residual current occurs. The display device is used to indicate the disconnected or connected state of the circuit breaker. The two functional modules of the circuit breaker test device system, the test circuit and the display device, are independent of each other. There is an inevitable correlation. During the working process of each functional module, if one of the modules fails and cannot work normally, the failure will not affect the normal operation of other parts.

Description

Test device system for earth fault current or residual current circuit breakers

technical field

The invention relates to a test device system for a low-voltage ground fault current or residual current circuit breaker. The test device system includes a test circuit and a display device.

The test circuit is used to check the action of the circuit breaker when there is a ground fault current or residual current, and the display device is used to indicate the disconnected or connected status of the circuit breaker.

Background technique

As we all know, it is necessary to install circuit breakers for electric shock protection in low-voltage power distribution systems, especially circuit breakers for residual current protection. Circuit breakers usually have a test device for users to test circuit breakers regularly to ensure residual current protection. The protection function is normal.

CN1031737C discloses a test key device of a ground leakage current circuit breaker or a differential current circuit breaker, the test key device has a function of testing the leakage current circuit breaker action and an indicator, and from the information disclosed in CN1031737C, it can be known that CN1031737C discloses The scheme can well solve the problem that when the circuit breaker disclosed in West German patent DE4.001, 680A1 is in the disconnected position, the test circuit is still connected by pressing the test button and the test resistor is burned out, but in the scheme disclosed by CN1031737C, the test The circuit is engaged with the elastic part of the indicator. If there is a failure of the elastic part or a manufacturing defect, neither the test circuit nor the indicator will work.

In the present invention, the test circuit is designed in the form of double switches through special-shaped torsion springs, which solves the situation that the test circuit of the press test device is still connected when the product disclosed in West German patent DE4.001, 680A1 is disconnected, and the present invention The key point is to separate the test loop and the indicator work into two functional modules that do not interfere with each other. The path is limited, the motion state of the driving part is limited, and it is confirmed that only the relationship of "0" or "1" appears.

Contents of the invention

The content of the present invention is a test device system for ground fault current or residual current circuit breaker. The test device system includes a test circuit and a display device. The test circuit is used to check the action of the circuit breaker when the ground fault current or residual current occurs. The display device is used to indicate the disconnected or connected state of the circuit breaker. The two functional modules of the circuit breaker test device system, the test circuit and the display device, are independent of each other. There is an inevitable correlation. During the working process of each functional module, if one of the modules fails and cannot work normally, the failure will not affect the normal operation of other parts.

The test circuit of the present invention contains a self-resetting square test button, and the test button can move downwards in a direction perpendicular to the top of the circuit breaker, and the test device system can be started by pressing the square test button, which is used as a square button. When the force disappears, the square test button can automatically return to the original position of pressing.

The square test button is positioned through the support fixed on the mechanism, and the positioning method is fixed upward by an L-shaped barb on the square button corresponding to the corresponding position of the support. The square test button has a square column Shaped guide post, used to limit the orientation of the square button during the pressing process. There is an inverted U-shaped groove next to the square test button, and one end of the straight arm of a special-shaped torsion spring applies upward torque to the square test button to make the square test button When the test button is normal, the end face of the upper cover of the circuit breaker is exposed upward. After pressing this button, the reset is also realized by the torsion of the torsion spring.

The special-shaped torsion spring is positioned through a cylinder on the support. One end of the straight arm of the torsion spring is placed in an inverted U-shaped groove next to the square button, and the other end is L-shaped, which is placed between the small positioning cylinder of the support and the rotating shaft. Between slides.

The test device system of the present invention has a display device, which displays the state of the circuit breaker contacts through the window on the upper cover of the circuit breaker. The working principle design of the display device has nothing to do with the movement and stop position of the handle of the circuit breaker. The work of the test circuit has nothing to do with it. The work of the display device is only corresponding to the position state of the contact, while the position state of the contact point of the circuit breaker is only connected or separated. The design of the circuit breaker ensures that the contact is not allowed to appear except connected. Or a third case other than separation.

The display device works through a moving indicator. A cylindrical hollow barb device is designed at the position of the indicator. The barb device is embedded in the convex hole of the side plate of the mechanism to retain the indicator. , there is a round hole at the lower end of the indicator, and one end of an elastic piece passes through this round hole as the power source for the indicator movement, and the other end of the elastic piece is embedded in the groove at the middle position of the rotating shaft, and the limit position of the side plate is designed as follows: To prevent the possibility of the elastic part jumping out of the groove, the rotating shaft will rotate with the change of the contact state, and the rotation of the rotating shaft will bring the elastic part to move, and the elastic part will drive the indicator to move. The different states of the indicator are just on the circuit breaker displayed in the cover window.

In order to make the display device better display the state of the contact position, there are two start and end point positioning points of the indicator movement position on the side plate of the mechanism, so that the indicator can only stop at the positioning point, that is, when other points in the display device If a part fails or is defective, it cannot affect the working state of the display device, avoiding the risk that the display device may not work normally.

Description of drawings

The following explanatory diagrams are used to illustrate the inventive concept of the test device system for earth fault current or residual current circuit breakers:

Figure 1 Outline drawing of ground fault current or residual current circuit breaker

Figure 2 System perspective view of ground fault current or residual current circuit breaker test device

Figure 3 The relationship between the square test button and the positioning support

Figure 4 Outline drawing of special-shaped torsion spring

Figure 5 The relationship between the square test button, the positioning support and the special-shaped torsion spring

Figure 6 Square Test Button Test State Diagram

Figure 7 The relationship diagram of the test circuit when the contact is in the separated state

Figure 8 The relationship diagram of the test circuit when the contact is in contact

Figure 9 shows the state diagram of the device when the contacts are in contact

Figure 10 The status diagram of the display device when the contacts are in the separated state

Figure 11 Relationship diagram of indicator limit points

detailed description

The content of the present invention is a test device system for ground fault current or residual current circuit breaker. The test device system includes a test circuit and a display device. The test circuit is used to check the action of the circuit breaker when the ground fault current or residual current occurs. The display device is used to indicate the disconnected or connected state of the circuit breaker. The two functional modules of the circuit breaker test device system, the test circuit and the display device, are independent of each other. There is an inevitable correlation. During the working process of each functional module, if one of the modules fails and cannot work normally, the failure will not affect the normal operation of other parts.

As shown in Figures 1 to 11, the specific embodiment of the present invention is that the test circuit contains a self-resetting square test button 1, and the test button 1 can move downwards in a direction perpendicular to the top of the circuit breaker. Test the button to start the test device system to work. When the force applied to the square button disappears, the square test button can automatically return to the original position of the press, as shown in Figure 1.

The square test button 1 is positioned through the support 7 fixed on the mechanism, and the positioning method is to fix the barb in the upward direction through an L-shaped barb on the square button 1 corresponding to the corresponding position of the support 7, and the square test The button 1 has a square cylindrical guide column, which is used to limit the orientation of the square button 1 during the pressing process, as shown in FIG. 3 .

There is an inverted U-shaped groove 1b next to the square test button 1, and a straight arm 9a at one end of a special-shaped torsion spring 9 applies upward torque to the square test button 1, so that the square test button 1 exposes the end face of the upper cover of the circuit breaker when it is normal. After pressing the button 1, the reset is also realized by the torsion force of the torsion spring 9, as shown in Fig. 5 and Fig. 6 .

Special-shaped torsion spring 9 is positioned by a cylinder 7b on the support member 7, and one end straight arm 9a of special-shaped torsion spring 9 is placed in an inverted U-shaped groove 1b next to square test button 1; the other end is L-shaped 9b, placed The support member 7 is positioned between the small cylinder 7c and the slideway 8a between the rotating shaft 8 .

The special-shaped torsion spring 9 acts as a double switch in the entire test circuit, that is, when the circuit breaker is in the disconnected state, the static contact 3 is separated from the moving contact 4, and the torsion spring 9 is placed on the supporting member 7 with the L-shaped end 9b Between the slideway 8a between the positioning small cylinder 7c and the rotating shaft 8, it is separated from the clip 5 of the positioning movable contact 4, that is, it does not contact. It is in contact with the lead end 7a of the fixed test resistor. The test circuit is not conducted because the L-shaped end 9b of the torsion spring is not in contact with the conductive clip 5, and the test system cannot work. When the circuit breaker is in the on state, as shown in the figure 7.

The static contact 3 is in contact with the movable contact 4, and the L-shaped end 9b of the torsion spring 9 is placed between the support member 7 positioning small cylinder 7c and the slideway 8a between the rotating shaft 8, and the protruding end of the clip 5 for positioning the movable contact 4 Phase 5a is "bitten", and the L-shaped end 9b is in contact with the buckle 5. This design is to ensure reliable contact. When the square test button 1 is pressed, the Z-shaped end 9a of the special-shaped torsion spring 9 and the fixed test resistor lead end 7a contact, the test circuit is connected, and the test device system starts to work, as shown in Figure 8.

The display device of the test device system of the present invention displays the state of the circuit breaker contacts through the window 2 of the circuit breaker upper cover. The working principle design of the display device has nothing to do with the movement and stop position of the circuit breaker handle 12. The working principle of the display device is the same as that of the test device. The test circuit of the system has nothing to do with the work. The work of the display device only corresponds to the position and state of the contacts, while the position and state of the contacts of the circuit breaker are only connected or separated. The design of the circuit breaker ensures that the contacts are not allowed to be disconnected. A third case other than pass or separation. The display device works through a moving indicator 6. A cylindrical hollow barb device 6a is designed at the position of the indicator, and the barb device 6a is embedded in the convex round hole of the side plate 10 of the mechanism to indicate There is a circular hole at the lower end of the indicator 6, and one end 11a of an elastic member 11 passes through the circular hole as the power source for the movement of the indicator 6, and the other end 11b of the elastic member 11 is embedded in the center of the rotating shaft 8 In the groove 8b, the limit position of the side plate 10 is designed to prevent the elastic member 11 from jumping out of the groove 8b. The rotating shaft 8 will rotate with the change of the contact state, and the rotation of the rotating shaft 8 will bring the elastic member 11 to move. , the elastic member 11 drives the indicator 6 to move again, and the different states of the indicator 6 are just displayed in the window 2 of the upper cover of the circuit breaker, as shown in Fig. 9 and Fig. 10 .

In order to make the display device better display the state of the contact position, there are two starting point 10a and end point 10b positioning points of the movement position of the indicator 6 on the mechanism side plate 10, so that the indicator 6 can only stop at the positioning point, that is, when If other parts in the display device are faulty or defective, the working state of the display device cannot be affected, avoiding the risk that the display device may not work normally, as shown in FIG. 11 .

Claims (5)

1. the test device system of earth-fault current or residual current circuit breaker, test device system comprises a test circuit and a display device, test circuit is for checking the action situation of isolating switch when there is earth-fault current or residual current, display device is used to indicate the disconnection of isolating switch or the state of connection, test circuit and display device two functional module of test device of circuit breaker system are separate separately, two functional modules form from respective part, dynamic fortune state, electric loop does not produce inevitable association, in each functional module course of work, if wherein a module breaks down, cisco unity malfunction, break down and can not affect the normal operation of other parts,

Described test circuit contains one can the square testing button (1) of self-replaced type, and square testing button (1) can by just moving downward perpendicular to the direction at isolating switch top, test device system work is started by pressing square testing button, when the acting force acting on square testing button disappears, square testing button can automatically return to the reference position of pressing;

Described square testing button (1) is positioned by the supporting member (7) be fixed in mechanism, and locator meams carries out the fixing of upward direction by the barb that a L shape barb on square testing button (1) is corresponding with supporting member (7) correspondence position, square testing button (1) has a square column type guidepost, for the guiding of square shaped testing button (1) in pressing process to spacing, there is an inverted U-shaped groove (1b) on square testing button (1) side, have one end straight-arm (9a) of a special-shaped torsion spring (9) upwards torsion put on square testing button (1), breaker upper cover end face is upwards exposed during to make square testing button (1) normal, after this square testing button (1) of pressing, reset also is lean on the torsion of special-shaped torsion spring (9) and realize,

Described special-shaped torsion spring (9) is positioned by the right cylinder (7b) on supporting member (7), one end straight-arm (9a) of abnormity torsion spring (9) is in Z-shaped, be placed in the groove (1b) that of square testing button (1) side is inverted U-shaped, the other end L-shaped (9b) of abnormity torsion spring (9), is placed between the slideway (8a) between supporting member (7) location small column (7c) and rotating shaft (8).

2. the test device system of earth-fault current according to claim 1 or residual current circuit breaker, abnormity torsion spring (9) act as the effect of biswitch in whole test circuit, namely be when isolating switch is in off-state, break (3) and movable contact (4) are separated, L shape end (9b) of abnormity torsion spring (9) is placed between the slideway (8a) between supporting member (7) location small column (7c) and rotating shaft (8), be separated with the fastener (5) of location movable contact (4), namely do not contact, when pressing square testing button (1) at this moment, even if the Z-shaped end (9a) of special-shaped torsion spring (9) contacts with fixation test resistance lead end (7a), test loop makes test loop not conducting because the L shape of special-shaped torsion spring holds (9b) not contact with conduction fastener (5), test macro cannot work, when isolating switch is in on-state, break (3) contacts with movable contact (4), L shape end (9b) of abnormity torsion spring (9) is placed between the slideway (8a) between supporting member (7) location small column (7c) and rotating shaft (8), " kill " with protruding end (5a) phase of the fastener (5) of location movable contact (4), L shape end (9b) of abnormity torsion spring (9) contacts with fastener (5), this design is for ensureing that contact is reliable, when pressing square testing button (1), the Z-shaped end (9a) of abnormity torsion spring (9) contacts with fixation test resistance lead end (7a), test loop is connected, test device system is started working.

3. the test device system of earth-fault current according to claim 1 or residual current circuit breaker, test device system has a display device, by the state of window (2) the display circuit breaker contact point of breaker upper cover, the principle of work design of display device has nothing to do with the motion of circuit breaker handle (12) and stop position, the principle of work of display device and the test circuit work of test device system have nothing to do, the work of display device is only corresponding with the location status of contact, and the location status of circuit breaker contact point is only connect or be separated two kinds of situations, the design of isolating switch ensure that contact does not allow the third situation occurred except connecting or being separated.

4. the test device system of earth-fault current according to claim 1 or residual current circuit breaker, display device carrys out work by the indicator (6) of a motion, the location place of indicator is designed with the barb apparatus (6a) of a cylindrical hollow, barb apparatus (6a) is embedded in the convex closure circular hole of mechanism's side plate (10), to carry out maintenance to indicator (6), there is a circular hole indicator (6) lower end, one end (11a) of one elastic component (11) is through this circular hole, as the power resources that indicator (6) moves, the other end (11b) of elastic component (11) is embedded in the groove (8b) in rotating shaft (8) centre position, side plate (10) spacing place is designed with the possibility preventing elastic component (11) from jumping out in groove (8b), rotating shaft (8) can be rotated with the change of contact state, the rotation of rotating shaft (8) will take elastic component (11) motion to, elastic component (11) drives indicator (6) to move again, the state just middle display of lid window (2) on-board the circuit breaker that indicator (6) is different.

5. the test device system of earth-fault current according to claim 4 or residual current circuit breaker, connecting point position state is better shown in order to make display device, mechanism's side plate (10) has initial point (10a) and terminal (10b) anchor point of two place's indicator (6) movement positions, energy anchor point place only can be stopped making indicator (6), namely when if other part in display device breaks down or defect time, the duty of display device can not be affected, evaded the risk that malfunction may appear in display device.