KR200377876Y1 - An automatic transfer switches having a neutral closed-arc-contact terminal - Google Patents

Abstract

The present invention relates to a power transfer switch having a neutral N-phase unopened arc contact device, and in detail, a neutral wire N phase is momentarily disconnected and disconnected when the power transfer switch opens and closes, thereby shortening the disconnection time. The present invention relates to a power transfer switch having an N-phase open arc contact device using a switching device provided with an N-phase open arc contact device.

According to the present invention, the length of the N-phase arc contact terminal is longer than the length of the three-phase arc contact terminal, and the distance between the N-phase commercial power side arc contact terminal and the emergency power-side arc contact terminal is reduced, so that the N-phase movable terminal 3 The arc contact terminal of the commercial power supply side is separated / opened later than the movable terminal on the phase, and the arc contact terminal of the emergency power supply side is first contacted / connected to prevent damage to the connection device due to overcurrent that may occur when switching power. There is an effect that can minimize the occurrence of the arc (Arc).

In addition, by providing a time difference between the contact time of the N-phase movable terminal to the N-phase arc contact terminal and the contact time of the three-phase movable terminal to the three-phase arc contact terminal, there is an effect of more stable power switching. As the area of the junction of the movable terminal and the N-phase arc contact terminal becomes wider, there is an effect that more stable power supply is achieved.

Description

An automatic transfer switches having a neutral closed-arc-contact terminal

The present invention relates to a power transfer switch having a neutral N-phase unopened arc contact device, in detail, a neutral wire N phase (hereinafter 'N') by shortening the time that the neutral wire N phase is momentarily separated and disconnected when the power transfer switch is opened and closed. The present invention relates to a power transfer switch having an N-phase open arc contact device using a switching device provided with an N-phase open arc contact device so that the connection state is always maintained.

In general, a power transfer switch is a device that switches power from a commercial power supply to a standby power supply or a commercial power supply when the power supplied by the KEPCO is a commercial power supply, and the power supplied by the power consumer is an emergency (preliminary) power supply. .

The switching of power is to change the power source supplied to the electric equipment. For example, when the power is supplied from the commercial power supply and the commercial power is interrupted, the power supply is supplied to operate the self-generation equipment to receive such emergency power. It means to switch.

In this case, there may be a method of operating a separate power generation facility as an emergency (preliminary) power source, or there may be a method of using a backup power source which is always standby by separately configuring a transmission line.

Manual power changer is to switch to emergency (preliminary) power by manually operating relay or mechanical changer when power failure is detected, and automatic power changer automatically detects power failure of commercial power and returns to emergency (spare) power. It is to perform the switching operation automatically.

The configuration of the power switching device is a fixed terminal, which is an input and output terminal of the power supplied by the KEPCO and the power supplied by its own generator, and a movable terminal that automatically connects to the input / output terminal of its generator when the power supplied from the KEPCO is interrupted, It is a driving means for driving the movable terminal.

 When the power supply from the KEPCO is interrupted, the power switching device configured as described above causes the driving means of the movable terminal to automatically switch the movable terminal to the power of its own generator, or to switch the movable terminal by a user's manual operation. have.

For example, Figure 1 is a circuit diagram showing the principle of the general three-phase four-wire switchgear, it is configured to open and close the power supply line and the neutral line N of the three phases R, S, T.

Here, the neutral wire N is connected / installed with various relays for preventing damage to the device in advance, or detecting abnormal current generated by ground current, short circuit current, and the like. This is the line that plays an important role for stable power supply.

In general, the power supply switch is designed such that the three-phase (R, S, T-phase) (hereinafter referred to as 'three-phase') movable terminal and the N-phase movable terminal are simultaneously connected or opened to the main power supply terminal.

However, due to mechanical errors, the N phase is opened before the three phases, or the three phases are connected before the N phases.

In this case, that is, when the three-phase movable terminal is connected or opened before the N-phase movable terminal, the phase voltage, which is the load terminal voltage, is instantaneously applied as the line voltage (phase voltage × √3 times) to generate a transient current. There is a problem that the arc is generated between the two terminals resulting in damage to the connection load facility.

Accordingly, an object of the present invention is to solve the conventional problems, the N-phase is connected to the three-phase prior to the power supply when the power switch is switched off (short) later, the N-phase until the three-phase power switch is completed A power supply switchgear equipped with an N-phase unopened arc contact device that prevents the generation of arcs and prevents the occurrence of transient currents by applying an uninterrupted rising voltage by being unopened and nonpolarized. The purpose is to provide.

Another purpose is to make the length of the arc contact terminal of the N-phase power terminal longer than the length of the arc contact terminal of the 3-phase power terminal, so that the contact time of the N-phase movable terminal to the arc contact terminal and the arc contact terminal of the three-phase movable terminal This is to allow more time difference between contact time and to allow more stable power switching.

In addition, the purpose is to ensure a stable power supply by increasing the area of the contact portion of the N-phase movable terminal and the N-phase arc contact terminal.

The present invention for achieving the above object, by rotating the main rotary shaft and the main rotary shaft for connecting the energizing unit consisting of a movable terminal and a fixed terminal coupled to the arc contact terminal on the upper portion, the live terminal A power switching device comprising an operation unit for driving a movable terminal, the power contact switching device having a function of switching from one power source to the other power source by a plurality of power sources consisting of a commercial power supply and a spare power source supplied from the fixed terminal. The length of the N-phase power terminal side is longer than that of the three-phase power terminal side, and the distance between the N-phase commercial power side arc contact terminal and the emergency power side arc contact terminal is between the three-phase commercial power side arc contact terminal and the emergency power side arc contact terminal. It is formed in a structure narrower than the distance between the terminals, and when the power is switched, the N-phase movable terminal is the arc contact terminal of the commercial power supply and the emergency power supply. Characterized in that the arc to the contact terminals at the same time connected to N different non-opened and solidifying the non-polar nature of their N.

The movable terminal may include a main driving terminal connected to the main rotary shaft and an auxiliary operating terminal connected to an auxiliary terminal shaft formed on an upper portion of the main driving terminal and interlocked with the main driving terminal, wherein the arc contact The terminal is composed of an arc main contact terminal coupled to the upper end of both fixed terminals of the commercial power supply side and the emergency power supply side, and an arc auxiliary contact terminal integrally coupled to the upper end of the arc main contact terminal, and the commercial power side arc contact terminal on the neutral line N The space between the arc contact terminals on the emergency power supply side is formed to be narrower than the distance between the arc contact terminal on the commercial power supply side and the arc contact terminal on the emergency power supply side. The N-phase is unopened and the N-phase characteristics are non-polarized by connecting the arc contact terminal of the power supply side and the arc contact terminal of the emergency power supply at the same time. .

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Example 1

Of the accompanying drawings, Figure 2 is an external perspective view of a power switching device according to an embodiment of the present invention, Figure 3a is a cross-sectional view 'A-A' of Figure 2, Figure 3b is a 'B-B' cross-sectional view of FIG.

As shown in the figure, the power switching switch 100 and the control unit 500 is provided with a solenoid (not shown), a magnet coil and a limit switch (not shown) for electrically driving the main rotary shaft 600 and the like. The conductive terminal includes a movable terminal 300 and a fixed terminal 200 having an arc contact terminal 400 coupled thereto.

The main rotary shaft 600 connects the operation unit 500 and the energization unit, and drives the movable terminal 300.

The fixed terminal 200 includes three phase R, S, T terminal 220 and N phase terminal 210 which are commercial power supply terminals, and three phase R, S, T terminal 220 'and N phase which are emergency power supply terminals. Terminal 210 '.

The arc contact terminal 400 is N-phase power terminal side length (L1) is formed longer than the length (L2) of the three-phase power terminal side, is screwed to the upper portion of each of the fixed terminal (200).

Accordingly, the distance W1 between the N-phase commercial power side arc contact terminal 410 and the emergency power side arc contact terminal 410 'is between the three-phase commercial power side arc contact terminal 420 and the emergency power side arc contact terminal 420'. It is formed in a structure narrower than the interval W2.

Due to the structure of the arc contact terminal 400 as described above, the N-phase movable terminal 310 is connected to the commercial power-side arc contact terminal 410 and the emergency power-side arc contact terminal 410 'at the same time when the power is switched, the N-phase In the open state, the N-phase characteristic becomes nonpolar.

Here, the arc contact terminal 400 serves to protect the fixed terminal 200, which is the arc contact terminal 400 before the movable terminal 300 is connected to the fixed terminal 200 which is the main power terminal. By first connecting to), it is possible to prevent damage to the fixed terminal 200 by the arc (Arc).

That is, the movable terminal 300 is first contacted with the arc contact terminal 400 before the contact with the fixed terminal 200 is made, and is later fixed by the continuous rotation of the main rotary shaft 600. In contact with the terminal 200 is connected.

Hereinafter, to describe the operating state of the present invention.

4A, 4B, and 4C are plan views showing operating states of the present invention, FIG. 4A is a state plan view when commercial power is supplied, FIG. 4B is a state plan view at power switching, and FIG. 4C is an emergency power supply. This is a plan view of the state when it is supplied.

First, when supply of commercial power is interrupted and a power failure occurs, the operation unit 500 operates the main rotary shaft 600, and the movable terminal 300 is driven from the terminal on the commercial power side by the driving of the main rotary shaft 600. The terminal is moved around the main axis of rotation (600).

In more detail, among the movable terminals 310 and 320 connected to the fixed terminals 210 and 220 and the arc contact terminals 410 and 420 on the commercial power side, the three-phase movable terminal 320 is the commercial power side. In the state where the contact is separated from the fixed terminal 220 and the arc contact terminal 420, the N-phase movable terminal 310 is continuously connected to the stationary terminal 210 and the arc contact terminal 410 on the commercial power supply side. do.

In this state, as the main rotary shaft 600 rotates continuously, the N-phase movable terminal 310 is disconnected from the commercial power supply side fixed terminal 210 and the arc contact terminal 410, and the emergency power supply side instantaneously. It is connected to the fixed terminal 210 'and the arc contact terminal 410'.

Here, the N-phase movable terminal 310 is separated from the commercial power side fixed terminal 210 and the arc contact terminal 410 later than the three-phase movable terminal 320 and opened, and the emergency power side fixed terminal 210 'and The arc contact terminal 410 'is first contacted and connected.

In addition, even when the power is switched from the emergency power side to the commercial power side, as described above, the N-phase movable terminal 310 is the commercial power side fixed terminal 210 and the arc contact terminal 410 than the three-phase movable terminal 320. ) Is opened and separated late, the emergency power supply stationary terminal 210 'and the arc contact terminal 410' is first contacted and connected.

Therefore, due to the structural features of the N-phase terminal as described above, when the power switching is made, the movable terminal 310 of the N-phase neutral wire is the commercial power side arc contact terminal 410 which is the KEPCO supply power, and the emergency power side arc contact which is the self-powered power supply. The terminals 410 'are simultaneously connected so that the N phase is unopened and the characteristics of the N phase are nonpolarized.

Hereinafter, another embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Example 2

5A is a cross-sectional view of part 'A-A' of FIG. 2 according to another embodiment of the present invention, and FIG. 5B is a cross-sectional view of part 'B-B' of FIG. 2 according to another embodiment of the present invention. to be.

Hereinafter, the second embodiment according to the present invention to be described is a modification of the movable terminal 300 and the arc contact terminal 400 in the first embodiment, the same configuration for the same configuration as the first embodiment We use the sign.

As shown in the drawings, in the power switching switch 100 according to the present invention, the first movable terminal 300 is connected to the main rotary shaft 600 driven by the main driving terminals (311, 321), and the stock price It is composed of auxiliary operation terminals 312 and 322 connected to the auxiliary terminal shaft 700 formed on the upper portions of the same terminals 311 and 321 and interlocked with the main operation terminals 311 and 321.

The fixed terminal 200 has three phase R, S, and T terminals 221 and N phase terminals 211, which are commercial power supply terminals, and three phase R, S, and T terminals which are emergency power supply terminals, similarly to the design of the first embodiment. 221 'and an N-phase terminal 211'.

In addition, the arc contact terminal 400 is an arc main contact terminals 411, 421 coupled to the upper end of the fixed terminal of the commercial power supply side and the emergency power supply side, and the arc is integrally coupled to the upper portion of the arc main contact terminals (411, 421) The auxiliary contact terminals 412 and 422 are formed.

The arc contact terminal 400 has an N-phase power terminal side length L1 ′ longer than the three-phase power terminal side length L2.

Therefore, the distance W1 'between the N-phase commercial power side arc main contact terminal 411 and the emergency power side arc main contact terminal 411' is three phases of the commercial power side arc main contact terminal 421 and the emergency power side arc main contact terminal 421. It is formed in a structure narrower than the interval W2 'between 421'.

Due to the structure of the arc contact terminal 400 as described above, the auxiliary operation terminal 312 on the N phase at the time of power switching is simultaneously connected to the commercial power side arc main contact terminal 411 and the emergency power side arc contact terminal 411 '. The phase is in an unopened state, and the characteristics of the N phase are made nonpolar.

Above, the operating state of the other embodiment of the present invention made of the configuration as described above is similar to the operating state of the invention of the first embodiment.

6A, 6B and 6C are plan views showing operating states of another embodiment according to the present invention, FIG. 6A is a state plan view when commercial power is supplied, and FIG. 6B is a state plan view at power switching, 6C is a state plan view when emergency power is supplied.

As shown in the figure, first, when supply of commercial power is interrupted and a power failure occurs, the operation unit 500 operates the main rotary shaft 600, and the N-phase main driving terminal (B) by driving the main rotary shaft (600). 311 is moved around the main rotary shaft 600 from the terminal on the commercial power supply side to the emergency power supply terminal.

When the N-phase main operating terminal 311 is rotated by the main rotary shaft 600 so that the end portion of the N-phase auxiliary operating terminal 312 comes into contact with the N-phase emergency power side fixed terminal 211 ', the auxiliary terminal shaft 700 The N-phase auxiliary movable terminal 312 continues to rotate around the center, and the rotation stops when the junction part of the auxiliary movable terminal 312 is completely in contact with the fixed terminal 211 '.

Therefore, by the continuous rotation of the N-phase auxiliary operating terminal 312, the joint portion of the N-phase auxiliary operating terminal 312 and the N-phase emergency-side fixed terminal 211 'is completely in contact with each other, the joint portion is widened, This reduces the occurrence of arcs, resulting in a safe supply of power.

As described above, when the supply of the emergency power supply is stopped, and when the commercial power supply is supplied, the same operation is performed in the opposite direction to the operation state as described above, and a description thereof will be omitted.

7A and 7B are performance test data according to the first embodiment of the present invention, and FIG. 7A shows the contact time of the N-phase movable terminal to the arc contact terminal when the power is switched from the commercial power supply side to the emergency power supply side. Experimental data showing the time difference between the three-phase movable terminal and the contact time to the arc contact terminal, Figure 7b is the contact time of the N-phase movable terminal to the arc contact terminal and the three-phase movable terminal when the power is switched to the emergency power supply side Experimental data showing the time difference from the contact time to the arc contact terminal.

According to the experimental data, Denotes the time interval between the moment when the N-phase movable terminal 310 contacts the N-phase arc contact terminal 410 'and the moment when the 3-phase movable terminal 320 contacts the three-phase arc contact terminal 420'. .

That is, as shown in the data above, This is the value indicated by the power switch. To It is a much longer time difference than), which allows more stable switching during power switching.

According to the present invention described above, the N-phase operation is performed by forming the length of the N-phase arc contact terminal longer than the length of the three-phase arc contact terminal and reducing the distance between the N-phase commercial power side arc contact terminal and the emergency power side arc contact terminal. The terminal is separated / opened later than the commercial power-side arc contact terminal than the three-phase movable terminal, and the emergency-contact arc contact terminal is first contacted / connected to prevent damage to the connection device due to overcurrent that may occur when switching power. And it is effective to minimize the generation of the arc (Arc).

In addition, the time difference between the contact time of the N-phase movable terminal to the N-phase arc contact terminal and the contact time of the three-phase movable terminal to the three-phase arc contact terminal allows a more stable power switching.

In addition, since the area of the junction portion of the N-phase movable terminal and the N-phase arc contact terminal is widened, there is an effect that a more stable power supply is made.

1 is a circuit diagram showing the principle of a typical three-phase four-wire switchgear;

2 is an external perspective view of a power switching device according to an embodiment of the present invention;

3A is a cross-sectional view taken along line 'A-A' in FIG. 2;

3B is a cross-sectional view taken along line 'B-B' in FIG. 2;

4A, 4B, and 4C are plan views showing operating states of the present invention;

5A is a cross-sectional view of a portion 'A-A' of FIG. 2 according to another embodiment of the present invention;

5B is a cross-sectional view of the portion 'B-B' of FIG. 2 according to another embodiment of the present invention;

6A, 6B, and 6C are plan views showing operating states of another embodiment according to the present invention; And

7A and 7B are performance test data according to the present invention.

※ Explanation of symbols for main parts of drawing

100: power transfer switch 200: fixed terminal

300: movable terminal 400: arc contact terminal

500: control panel 600: main axis of rotation

700: auxiliary terminal shaft

Claims (2)

An energization part consisting of a movable terminal 300 and a fixed terminal 200 coupled with an arc contact terminal 400 thereon, a main rotary shaft 600 connecting the movable terminal 300 of the energized portion, and the main rotary shaft; The control unit 500 is configured to rotate the 600 to drive the movable terminal 300 to switch from one power source to the other power source by a plurality of power sources including commercial power and spare power supplied from the fixed terminal 200. In the power supply switching device 100 having a function, The arc contact terminal 400 has a length L1 of the neutral line N-phase power terminal side longer than the length L2 of the three-phase (R, S, T-phase) power terminal side, The distance (W1) between the commercial power side arc contact terminal 410 and the emergency power side arc contact terminal 410 'of the neutral line N phase is three-phase (R, S, T phase) commercial power side arc contact terminal 420 and the emergency power side arc. It is formed in a structure narrower than the gap (W2) between the contact terminals 420 ', The N-phase movable terminal 310 of the neutral line N connects the commercial power side arc contact terminal 410 and the emergency power side arc contact terminal 410 'at the time of power supply switching, so that the N phase is unopened and the N phase characteristics are made nonpolar. Power transfer switch with phase open arc contact device. An energization part consisting of a movable terminal 300 and a fixed terminal 200 coupled with an arc contact terminal 400 thereon, a main rotary shaft 600 connecting the movable terminal 300 of the energized portion, and the main rotary shaft; The control unit 500 is configured to rotate the 600 to drive the movable terminal 300 to switch from one power source to the other power source by a plurality of power sources including commercial power and spare power supplied from the fixed terminal 200. In the power supply switching device 100 having a function, The movable terminal 300 is connected to the main driving terminals 311 and 321 connected to the main rotary shaft 600 and the auxiliary terminal shaft 700 formed on the main driving terminals 311 and 321. It consists of auxiliary operation terminals (312, 322) in conjunction with the main operation terminals (311, 321), the arc contact terminal 400 is fixed terminal (211, 211 ', 221, both of the commercial power supply side and emergency power side) 221 ') the arc main contact terminals 411, 411', 421, 421 'coupled to the upper end, and the arc auxiliary contact integrally coupled to the upper portion of the arc main contact terminals 411, 411', 421, 421 '. Consisting of terminals 412, 412 ', 422, 422', The distance W1 'between the commercial power side arc main contact terminal 411 and the emergency power side arc main contact terminal 411' of the neutral line N phase is three-phase (R, S, T phase) commercial power side arc main contact terminal 421. Is formed in a structure narrower than the space (W2 ') between the emergency power supply side arc contact terminal (421'), The neutral terminal N-phase movable terminal 300 connects the commercial power side arc main contact terminal 411 and the emergency power side arc contact terminal 411 'at the time of power switching, so that the N phase is unopened and the characteristics of the N phase are nonpolarized. Power transfer switch with N-phase open arc contact device.