KR100337542B1 - Closed Transition Transfer Switch Without Power Failure - Google Patents

Abstract

The present invention provides an uninterruptible power supply for operating the movable contactors 37a and 37b to supply power to the load terminal 25 by supplying the commercial power supply 26 to the commercial power supply terminal and supplying the emergency power supply 24 to the emergency power supply terminal. A switchgear comprising: an operating mechanism having an input and trip function between a commercial power supply 26 and a load terminal 25 and an operating mechanism having an input and trip function between an emergency power supply 24 and a load terminal 25, The present invention relates to a power changer in which two mechanisms are arranged symmetrically in a single manipulator so that an uninterruptible switching operation is always possible. That is, when the emergency power 24 is to be used due to a power failure, maintenance, or inspection while the commercial power 26 is used in the load terminal 25, the commercial power 26 has an operation structure in which the commercial power 26 is turned on. The emergency power source 24 is also connected to the load terminal 25, and both power sources are connected to the load terminal 25, and then the movable contacts 37a and 37b connecting the commercial power source 26 and the load terminal 25 are tripped. The power connection is moved from the commercial power supply 26 to the emergency power supply 24 in an uninterrupted state. In addition, the power connection movement from the emergency power supply 24 to the commercial power supply 26 proceeds in the same manner to realize uninterruptible power supply switching.

Description

Uninterruptible Power Switching Switchgear {Closed Transition Transfer Switch Without Power Failure}

Field of invention

The present invention relates to an uninterruptible power transfer switch without power failure for connecting two different power sources of commercial power and emergency power to a load terminal while maintaining an uninterrupted state. More specifically, the present invention has a function of switching between two power sources, the commercial power is connected to the load terminal, the emergency power is also redundantly connected to the load terminal after the commercial power is disconnected from the load terminal and the emergency power from the commercial power source The present invention relates to an uninterruptible power supply switching switch that enables switching to a power source and maintains an uninterrupted state at all times even when switching between two power sources.

Background of the Invention

Power switchgear for connecting two different power sources such as commercial power source and emergency power source or star connection power source and delta connection power source to the load terminal is developed and used in various forms according to its capacity and application.

The present applicant has developed a more improved design than the conventional power switch, and filed as a patent application No. 98-24896 (filed on June 29, 1998) and patent application No. 98-24897 (filed on June 29, 1998) There is a bar.

In the case of the conventional power switching switch, when switching from the commercial power source to the emergency power supply, the switching procedure is to disconnect the commercial power supply from the load terminal while the commercial power supply is connected to the load terminal, and then connect the emergency power supply to the load terminal again. In the case of switching from the emergency power source to the commercial power source, the procedure was performed in the reverse order. This method is an instantaneous operation in which switching time is very short, but instantaneous power failure occurs at the load terminal because commercial power and emergency power are both disconnected from the load terminal. Therefore, the present inventors have come to develop an uninterruptible power switching switchgear capable of switching power in an uninterruptible state at all times in order to compensate for the shortcomings of the power interruption of the conventional power switching switch and to protect the load terminals that are affected by the minute power interruption. will be.

It is an object of the present invention to provide an uninterruptible power switching switch that can maintain an uninterruptible state at all times when connecting two different power sources such as a commercial power supply and an emergency power supply to each other.

Another object of the present invention is to provide an uninterruptible power supply switching switch that can protect a load terminal that is easily affected even by a minute momentary power failure.

The above and other objects of the present invention can all be achieved by the present invention described below.

1 is a cross-sectional view of the operation mechanism of the uninterruptible power supply switching switch according to the present invention.

2 is a plan view of the overall shape of the uninterruptible power supply switching switch according to the present invention.

3 is a cross-sectional view of the operation mechanism of the commercial power supply and the load side when the uninterruptible power supply switching switch according to the present invention is turned on (ON).

4 is a cross-sectional view of a commercial power supply and an operation mechanism part on the load side of a trip of an uninterruptible power supply switching switch according to the present invention.

5 is a cross-sectional view of the charger mechanism of the uninterruptible power supply switching switch according to the present invention.

6 is a control circuit diagram of an uninterruptible power supply switching switch according to the present invention.

* Brief description of the major symbols in the drawings *

8a: Commercial power supply coil 8b: Emergency power supply coil

9a: Rod on Commercial Power Side 9b: Rod on Emergency Power Side

11a: Operation core of commercial power supply side 11b: Operation core of emergency power supply side

10a: Compression spring on commercial power supply 10b: Compression spring on emergency power supply

12a: Control lever for commercial power supply 12b: Control lever for emergency power supply

13a: control shaft for commercial power supply 13b: control shaft for emergency power supply

14a: Connecting connector for commercial power supply 14b: Connecting connector for emergency power supply

15a: Movable iron core for commercial power supply trip 15b: Movable iron core for emergency power supply trip

16a: latch for commercial power supply 16b: latch for emergency power supply

17a: Control lever for commercial power supply 17b: Control lever for emergency power supply

18a: Commercial Power Side Bearing 18b: Emergency Power Side Bearing

19a: Stopper pin for commercial power supply 19b: Stopper pin for emergency power supply

20a: Commercial power side compression spring 20b: Emergency power side compression spring

21a: limit switch for commercial power supply 21b: limit switch for emergency power supply

22a: Trip coil on commercial power side 22b: Trip coil on emergency power side

23a: Latch operation shaft for commercial power supply 23b: Latch operation shaft for emergency power supply

24: emergency power (terminal) 25: load terminal 26: commercial power (terminal)

27: base 28: support plate 29, 30: instrument base

31a: switch lever for commercial power supply 31b: switch lever for emergency power supply

32a: limit switch for commercial power supply 32b: limit switch for emergency power supply

33a: connecting lever for commercial power supply 33b: connecting lever for emergency power supply

34a: Emergency power side fire room 34b: Emergency power side fire room

35a: Main power side breaker spindle 35b: Emergency power side breaker spindle

36a: Fixed core on commercial power side 36b: Fixed core on emergency power side

37a: movable contactor for commercial power supply 37b: movable contactor for emergency power supply

The uninterruptible power switching switch of the present invention is moved into the coil by the excitation of the input coils (8a, 8b) and movable movable cores (11a, 11b) connected to the operating levers (17a, 17b, 12a, 12b), the movable Operation levers 17a, which are connected to the iron cores 11a and 11b and integrally formed on the operation shafts 13a and 13b, are rotated by the movement distances of the movable iron cores 11a and 11b about the operation shafts 13a and 13b. 17b, 12a, 12b, and the blocking part spindles 35a, 35b interlocked with the operating shafts 13a, 13b and the connecting bushes 14a, 14b to rotate by the same angle as the operating shafts 13a, 13b. And a movable contact connected to the disconnecting main shafts 35a and 35b to contact (ON) or switch (OFF) the load side terminal 25 and the commercial power supply 26 or the load side terminal 25 and the emergency power supply 24. 37a, 37b), which are connected to the ends of the operation levers 17a, 17b, 12a, and 12b, move along the long holes of the instrument base plates 29 and 30, and control the movement of the movable contactors 37a and 37b. The operation shafts 13a and 13b are controlled by the bearings 18a and 18b around the stopper pins 19a and 19b connected to the fur pins 19a and 19b and the ends of the operation levers 17a, 17b, 12a and 12b. The moving cores moved to the inside of the coil by the excitation of the latches 16a and 16b and the trip coils 22a and 22b, which prevent the operating shafts 13a and 13b from rotating oppositely when rotated by a predetermined angle. 15a, 15b and compression springs 10a, 10b, 20a, 20b for returning the movable iron cores 11a, 11b, 15a, 15b.

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

1 is a cross-sectional view of the operating mechanism of the present invention, the operation mechanism to enable the input and trip of the commercial power supply 26 and the load terminal 25, the emergency power supply 24 and the load terminal 25 input And the operating mechanism to enable the trip is arranged symmetrically with each other. 1 shows a state in which the commercial power supply 26 and the load terminal 25 are tripped, and the emergency power supply 24 and the load terminal 25 are inserted.

Fig. 2 is a plan view of the overall shape of the present invention, and is largely composed of a charger mechanism portion and an operation mechanism portion. The charger section is a commercial terminal 26, emergency terminal 24 and load terminal 25 connected by movable contacts 37a and 37b, and extinguishing chambers 34a and 34b for extinguishing arcs generated at the time of connection. ), And the blocking part spindles 35a and 35b for interlocking the operation mechanism and the tripping operation. The operation mechanism part is for the input coils 8a and 8b for the input of the movable cores 11a and 11b, the trip coils 22a and 22b for the tripping of the tripping cores 15a and 15b, and for the input and trip operation. It is composed of several other components connected together.

3 is a cross-sectional view showing the state of the operating mechanism part when the commercial power supply 26 and the load terminal 25 are turned on. The movable iron cores 11a and 11b move inside the coil by excitation of the input coil. At this time, the compression springs 10a and 10b inside the coil are simultaneously compressed and the operation levers 17a, 17b, 12a, and 12b integrally formed on the operation shafts 13a and 13b by the movement of the movable iron cores 11a and 11b are provided. Breaking part spindle which is rotated by moving distance of movable iron cores 11a and 11b while pushing about the operation shafts 13a and 13b and interlocked as a square hole of the operation shafts 13a and 13b and the connecting bushes 14a and 14b. (35a, 35b) are simultaneously rotated by the same angle as the operation shaft (13a, 13b) to cause the movable contact (37a, 37b) connected to the interruption part spindle (35a, 35b) load side terminal 25 and the commercial power supply terminal (26) ) Or the load-side terminal 25 and the emergency power terminal (24). At this time, the stopper pins 19a and 19b connected to the ends of the operating levers 17a and 17b move along the long holes of the instrument base plates 29 and 30, and no longer move at the ends of the holes. , The rotation of 13b is stopped, and the movements of the main blocks 35a and 35b interlocked with the operation shafts 13a and 13b as the connection bushes 14a and 14b can be controlled. Further, the latches 16a when the bearings 18a, 18b rotating about the stopper pins 19a, 19b connected to the ends of the operating levers 17a, 17b are rotated by the controlled angles of the operating shafts 13a, 13b. , 16b prevents the operation shafts 13a and 13b from rotating in reverse. This state is called an input state, and the commercial power supply 26 or the emergency power supply 24 flows to the load terminal 25 by the movable contacts 37a and 37b.

Fig. 4 is a cross-sectional view showing the state of the operating mechanism part at the time of tripping between the commercial power supply 26 and the load terminal 25. The excitation of the trip coils 22a and 22b causes the movable cores 15a and 15b to move inside the coil and start operation. By the movement of the iron cores 15a and 15b, the latch shaft linked thereto rotates. At this time, the operating shafts 13a and 13b, which are stopped by the latch while the latch formed integrally with the latch shaft rotates as opposed to the closing operation, are applied to the elastic repulsive force of the compression springs 10a and 10b inside the input coils 8a and 8b. As a result, the main shafts 35a and 35b which rotate in the opposite direction to the closing operation and are interlocked by the connecting bushes 14a and 14b also rotate in the opposite direction to the closing operation. At this time, the movable contacts 37a and 37b break the connection between the load terminal 25 and the commercial power supply 26 or the load terminal 25 and the emergency power supply 24. This state is called a trip state.

Fig. 5 is a cross-sectional view of the charger mechanism, which is interlocked as a square hole of the operation shafts 13a and 13b and the connection bushes 14a and 14b and rotates by the same angle as the operation shafts 13a and 13b. , The connection levers 33a, 33b, arcing chambers 34a, 34b for extinguishing arcs generated during the connection, and the disconnection main shafts 35a, 35b, connected to the load side terminal 25 and the commercial power supply 26 or the load side terminal. It consists of the movable contactors 37a and 37b which contact (25) and the emergency power supply 24 (ON) or switch off (OFF).

Figure 6 is a control circuit diagram of the present invention with the operation of the uninterruptible power supply switching switch will be described in detail below.

The switch according to the present invention is characterized in that the input and trip operations of the A power supply and the input and trip operations of the B power supply are independent of each other, and are operated without being interlocked.

A description will be given when the B power supply 24 is turned on, starting from the operation structure of FIG. First, the operation voltage is applied to the B power supply 24, and power is applied to the input coil 8b through the limit switch 21b provided inside the manipulator to excite the input coil 8b. At this time, the movable iron core 11b compresses the compression spring 10b and is sucked into the coil. The rod 9b fixed to the movable iron core 11b rotates while pushing the operation lever 12b, and the operation shaft 13b and the operation lever 17b fixed like the operation lever 12b also rotate together. The bearing 18b and the stopper pin 19b at the end of the operating lever 17b rotating about the operating shaft 13b move along the latch 16b, and the stopper pin 19b moves to the instrument base 30. Follow the groove in the stop and stop at the end of the groove. At the same time, the tripping iron core 15b for the trip acts upward by the compression spring 20b, and the latch 16b linked thereto also acts to rotate in the direction of the operation shaft 13b. When the operating lever 17b is rotated and the bearing 18b is caught by the latch 16b, the closing is completed. At that time, the latch 16b cuts off the limit switch 21b to cut off the operating power applied to the B side. Is over. When the operating shaft 13b rotates, the switch lever 31b also rotates to bring the broken limit switch 32b into contact again to prepare for the next trip operation. As shown in the circuit diagram of Fig. 6, the input power to the B power supply is applied to B1 and flows to B2. The state in which the feeding is completed is shown in FIG.

A description will be given when the B power supply 24 is tripped, starting from the operation structure of FIG. First, as shown in FIG. 6, the operation power is applied through BT1 to flow to BT2, and the power is applied to the trip coil 22b to excite the trip coil 22b. At this time, the movable core 15b compresses the compression spring 20b and is sucked into the trip coil 22b. As the latch 16b interlocked with the movable core 15b rotates against the input, the movable iron core 11b retreats backward by the elastic repulsive force of the compression spring 10b inside the input coil 8b, and the rod linked thereto ( 9b) retracts backwards and the levers 12b, 17b, 31b rotate in the opposite direction as the closing. At this time, as soon as the latch 16b rotates backward, the bearing 18b falls down, and the stopper pin 19b falls like the bearing 18b, stops at the groove end of the instrument base 30, and the trip operation is completed. At this time, as the latch 16b rotates, the limit switch 21b contacts again to prepare for the next input, and the limit switch 32b is disconnected again to terminate the trip power supply, thereby completing the trip state.

The input and trip of the A power supply proceed in the same way as the B power supply. The A power supply, the trip operation structure and the B power supply, and the trip operation structure are symmetrically arranged.

The uninterruptible power switching switch according to the present invention, when using the commercial power in the load terminal, when emergency power must be used due to a power failure, maintenance, or inspection, the emergency power is also connected to the load terminal when the commercial power is turned on. After connecting all of them to the load terminal, tripping the movable contactor connecting the commercial power supply and the load terminal to move the power connection from the commercial power supply to the emergency power supply to maintain the uninterrupted state, as well as the load terminal that is easily affected by minute momentary power failure. It has the effect of protecting the power supply to maintain a stable power supply.

Simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

Claims (5)

In the uninterruptible power switching switch which operates the movable contactors 37a and 37b to supply the commercial power supply 26 to the commercial power supply terminal and supply the emergency power supply 24 to the emergency power supply terminal. , Movable iron cores 11a and 11b which are moved into the coil by excitation of the input coils 8a and 8b and are extended to the operation levers 17a, 17b, 12a and 12b and connected to each other; An operation lever connected to the movable cores 11a and 11b and integrally formed on the operation shafts 13a and 13b to rotate by a moving distance of the movable cores 11a and 11b about the operation shafts 13a and 13b. 17a, 17b, 12a, 12b); Blocking part spindles 35a and 35b interlocked with the operation shafts 13a and 13b as square holes of the connection bushes 14a and 14b to rotate by the same angle as the operation shafts 13a and 13b; Movable contactor 37a connected to the interrupting shafts 35a and 35b to contact (ON) or switch (OFF) the load side terminal 25 and the commercial power supply 26 or the load side terminal 25 and the emergency power supply 24. , 37b); Stopper pins 19a and 19b connected to the ends of the operating levers 17a, 17b, 12a, and 12b to move along the long holes of the instrument bases 29 and 30 and to control the movement of the movable contactors 37a and 37b. ; The operating shaft when the bearings 18a and 18b are rotated by a controlled angle with respect to the stopper pins 19a and 19b connected to the ends of the operating levers 17a, 17b, 12a, and 12b. Latches 16a and 16b which prevent 13a and 13b from rotating in reverse; Movable iron cores 15a and 15b moved into the coil by excitation of the trip coils 22a and 22b and interlocked with the latches; And Compression springs (10a, 10b, 20a, 20b) for returning the movable iron cores (11a, 11b, 15a, 15b); Uninterruptible power supply switching switch characterized in that consisting of. delete According to claim 1, wherein the operating mechanism 26 and the load terminal 25, and between the emergency power source 24 and the load terminal 25, the operation mechanism unit is symmetrical so that the input and trip operation can be performed alone or in combination Uninterruptible power supply switching switch characterized in that the arrangement. delete 2. The latch according to claim 1, wherein the latch (16a, 16b) stops the bearings (18a, 18b) upon closing, thereby stopping the operation of the operating mechanism, thereby maintaining the contact state of the movable contacts (37a, 37b) of the charger mechanism and tripping. Release the bearings 18a and 18b so that the movable contactors 37a and 37b break the connection between the commercial power supply 26 and the load terminal 25 or the emergency power supply 24 and the load terminal 25 to maintain the switching state. Uninterruptible power switching switch characterized in that it serves as an intermediary.