KR100473085B1 - Digital control apparatus of gas insulated switchgear - Google Patents

Abstract

The present invention provides at least a signal for an open / close state of a breaker auxiliary contact of a gas insulated switchgear, an open / close state of a breaker auxiliary contact, an open / close state of a ground switch contact, and an open / close state of a relay contact. Receive one signal and switch electronically, open / close state of breaker auxiliary contact of gas insulated switchgear, open / close state of disconnector auxiliary contact, open / close of ground switch auxiliary contact by microprocessor Receives at least one of the signal for the open / closed state of the state and relay contacts, performs arithmetic processing according to an execution program stored in ROM, controls the overall operation, and opens / closes each contact processed by the microprocessor. Store data in RAM and output from the microprocessor Receives the control signal from the touch screen, displays the operation status and the screen to receive the user's command, inputs the user's command, and detects the gas density signal of the gas insulated switchgear by the gas density sensor. It receives the converter and converts it into a digital signal and outputs it to the microprocessor, and drives the relay array by receiving the control signal output from the microprocessor to drive control at least one of a trip coil, a closing coil and a motor of the gas insulated switchgear in the relay array. In addition, the speaker is configured to output an abnormal state occurrence of the gas insulated switchgear by a speaker.

Therefore, the present invention can easily maintain and repair the gas insulated switchgear, simplify the wiring structure, improve the workability, reduce the manufacturing cost, and at the same time facilitate the automation of the substation. Can be.

Description

DIGITAL CONTROL APPARATUS OF GAS INSULATED SWITCHGEAR}

The present invention relates to a digital control device of a gas insulated switchgear.

Since a conventional gas insulated switch is assembled with a large amount of relays and complicated wirings, productivity is reduced due to complicated wiring work, and the size and the like have been raised as problems. Accordingly, in recent years, there is a demand for a gas insulation switch suitable for a digital power system having a simple structure and which can be easily used.

The conventional gas insulated switchgear is an analog control system, and the sequence control circuit includes a relay, a switch, a counter, a timer, a pilot lamp, an alarm display device, a cable, and the like. Therefore, there is a problem in that the structure is complicated because many relays and cables are required inside the gas insulated switchgear. Also, if the sequence control circuit needs to be modified, the relay must be replaced and the wiring must be modified accordingly. There was a problem that can not respond quickly.

The present invention has been made to solve various problems as described above, and an object of the present invention is to provide a digital control device of a gas insulated switchgear that can be easily maintained.

Another object of the present invention is to provide a digital control device for a gas insulated switchgear that can have a simple wiring structure, improve workability, and reduce manufacturing costs.

Still another object of the present invention is to provide a digital control device for a gas insulated switchgear capable of automating a substation.

In order to achieve the above object, the present invention provides an open / closed state of a circuit breaker auxiliary contact of a gas insulated switchgear, an open / closed state of a circuit breaker auxiliary contact, an open / closed state of a ground switch auxiliary contact, and an open / closed state of a relay contact. A photo switching unit which is electronically switched upon receiving at least one signal, and an open / close state of a breaker auxiliary contact of a gas insulated switchgear, an open / close state of a breaker auxiliary contact, and a ground switch auxiliary contact according to switching of the photo switching unit. A microprocessor which receives at least one signal of the open / closed state of the relay and the open / closed state of the relay contact, performs an operation processing according to an execution program stored in the ROM, and controls the entire operation; RAM to store open / close data of each processed contact A screen switch for receiving a control signal output from the microprocessor and displaying a screen for receiving an operation state and a user's command, and inputting a user's command; and detecting a gas density of the gas insulated switchgear by a gas density sensor. A control signal output from the microprocessor to drive and control at least one of a trip coil, a closing coil and a motor of the gas insulated switchgear; And drive means for driving control of the relay array.

Hereinafter, a digital control apparatus for a gas insulated switchgear according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram schematically showing a digital control apparatus of a gas insulated switchgear according to an embodiment of the present invention.

As shown in FIG. 1, the digital control device of the gas insulated switchgear according to the exemplary embodiment of the present invention has an open / close state of the breaker auxiliary contact 11 of the gas insulated switchgear 10, and an assisting breaker. Photo switching unit that is electronically switched by receiving at least one signal of the open / closed state of the contact 12, the open / closed state of the ground switch auxiliary contact 13, and the open / closed state of the relay contact 14. And the open / close state of the breaker auxiliary contact 11 of the gas insulated switchgear 10, the open / close state of the disconnector auxiliary contact 12, and the ground switch assist according to the switching of the photo switching unit 20. At least one signal of the open / closed state of the contact 13 and the open / closed state of the relay contact 14 is received and arithmetic processed according to an execution program stored in a ROM (Read Only Memory) 30, To control the overall behavior Receives a microprocessor 40, a random access memory (RAM) 95 for storing open / closed data of each contact processed by the microprocessor 40, and a control signal output from the microprocessor 40. The gas density of the screen switch 50 for displaying the operation state and the screen receiving the user's command and inputting the user's command and the gas density of the gas insulated switchgear 10 by the gas density sensor 15. A / D converter 60 for receiving a signal and converting it into a digital signal and outputting the digital signal to the microprocessor 40, a trip coil 16, a closing coil 17, and a motor 18 of the gas insulated switchgear 10. Drive means 80 for driving control of the relay array 70 in response to a control signal output from the microprocessor 40 to drive control of at least one of the at least one, and outputs sound when an abnormal state of the gas insulated switchgear 10 occurs. And a speaker 90 for output.

The photo switching unit 20 receives the open / close signal of the breaker auxiliary contact 11 of the gas insulated switchgear 10 and switches on / off the first photo coupler 21 and the gas insulated switch 10 of the gas insulated switchgear 10. The second photo coupler 22 which is switched on / off by receiving the open / close signal of the disconnector auxiliary contact 12 and the open / close signal of the ground switch auxiliary contact 13 of the gas insulated switch 10 are switched. The third photo coupler 23 is turned on and off, and the fourth photo coupler 24 is switched on and off in response to the open / close signal of the relay contact 14 of the gas insulated switchgear 10.

The driving means 80 excites the trip coil 16 of the gas insulated switchgear 10 to control the opening of the breaker auxiliary contact 11 so that the breaker auxiliary contact 11 output from the microprocessor 40 is controlled. The first relay driver 81 driving the first relay 71 of the relay array 70 and the closing coil 17 of the gas insulated switchgear 10 by receiving the open drive control signal of The second relay 72 of the relay array 70 is driven by receiving the close driving control signal of the breaker auxiliary contact 11 output from the microprocessor 40 to control the closing of the breaker auxiliary contact 11. The second relay driver 82 and the motor 18 of the gas insulated switchgear 10 are rotated forward and reverse to open / close the disconnector auxiliary contact 12 and to control the ground breaker auxiliary contact 13. The microphone to open / close control The third relay driver 83 receives the forward / reverse rotation drive control signal of the motor 18 output from the low processor 40 and drives the third relay 73 of the relay array 70. .

The screen switch 50 has on-site control, remote control, skid control, open / close control of the breaker auxiliary contact 11 of the gas insulated switchgear 10, open / close control of the breaker auxiliary contact 12, and grounding. Open / close control of switch auxiliary contact point 13, open / close state of breaker auxiliary contact 11 of gas insulated switchgear 10, open / close state of disconnector auxiliary contact 12, ground switch auxiliary contact 13 ) Open / closed state of the relay contact 14, open / closed state of the relay contact 14, an alarm state alarming the occurrence of abnormality of the gas insulated switchgear 10, and density data of the insulating gas filled in the gas insulated switchgear 10. Etc. are expressed.

The density data displayed on the touch screen 50 is expressed as a numerical value, a scale of a gas density gauge, a graph of gas density over time, and the like for easy reading.

In the description of the present invention, the interlock condition means that when the relay contact 14 is in the open state (OFF), the opening / closing control of the breaker auxiliary contact 11 is interlocked to open / close the breaker auxiliary contact 11. If the control is impossible and the breaker auxiliary contact 11 is closed, the open / close control of the breaker auxiliary contact 12 is interlocked so that the open / close control of the breaker auxiliary contact 12 is impossible and the breaker auxiliary contact ( 11) When the closed state or the disconnector auxiliary contact point 12 is closed, the opening / closing control of the grounding switch auxiliary contact 13 is interrupted and the opening / closed control of the grounding switch auxiliary contact 13 is impossible. Say.

Next, the operation and effects of the digital control device 100 of the gas insulated switchgear according to the embodiment of the present invention configured as described above will be described.

First, the main switch (not shown) of the gas insulated switchgear 10 of the present invention is switched on to apply power, and then a screen of field control, remote control, and skid control is displayed on the touch screen 50. Touching the on-site control of the switch with a finger can operate the gas insulated switch 100 of the present invention in the digital control device 100 according to the present invention installed in the field.

1. Operation when the circuit breaker auxiliary contact 11 of the gas insulated switchgear 10 is closed

When the circuit breaker auxiliary contact 11 is closed in such a state as to be operated, when a circuit breaker trip command is input to the microprocessor 40 by switching on a switch (not shown) displayed on the touch screen 50, The microprocessor 40 determines whether the relay contact 12 is in a closed state (OFF state). When the relay contact 12 is in a closed state (interlock state), the closed state is maintained as it is, and the relay contact ( If 12) is not in the closed state (when the relay contact 12 is in the ON state), the relay contact 12 is in the open state because the relay contact 12 is in the open state, and therefore the signal is transmitted to the fourth switch of the photo switch section 20. It is input to the microprocessor 40 through the photo coupler 24, in which the relay contact 12 receives an open state, performs arithmetic processing, and stores it in the RAM 95. The relay contact 12 is opened to the touch screen 50, and a control signal for opening the circuit breaker auxiliary contact 11 to the first relay driver 81 of the driving means 80 is output.

Accordingly, the first relay 71 receiving the drive signal from the first relay driver 81 operates to excite the trip coil 16 of the gas insulated switchgear 10, and to excite the trip coil 16. The breaker auxiliary contact 11 of the gas insulated switchgear 10 closed by this is opened.

2. Operation when the breaker auxiliary contact 11 of the gas insulated switchgear 10 is opened.

On the other hand, when the circuit breaker auxiliary contact 11 is open, when the circuit breaker close command is input to the microprocessor 40 by switching on a switch (not shown) displayed on the touch screen 50, the microprocessor 40 is input to the microprocessor 40. By determining whether the relay contact 12 is in the closed state (OFF state), and when the relay contact 12 is in the closed state (interlock state), the breaker auxiliary contact 11 is in the interlock state. Keep the open state. When the relay contact 12 is not in the closed state (when the relay contact 12 is in the ON state), since the relay contact 12 is in the open state, the signal is transmitted to the photo switch unit ( Since it is not input to the microprocessor 40 through the fourth photo coupler 24 of 20, the microprocessor 40 expresses that the breaker contact 11 is closed on the touch screen 50, The control signal for closing the circuit breaker auxiliary contact 11 is output to the second relay driver 82 of the driving means 80.

Accordingly, the second relay 72 receiving the drive signal from the second relay driver 82 operates to excite the closing coil 17 of the gas insulated switchgear 10, and to excite the closing coil 17. The breaker auxiliary contact 11 of the gas insulated switchgear 10 opened by this is closed.

3. Operation when the disconnector auxiliary contact 12 of the gas insulated switchgear 10 is closed

When the disconnector auxiliary contact 12 is closed, when the switch (not shown) displayed on the touch screen 50 is switched on to input the disconnector open command to the microprocessor 40, the microprocessor 40 It is determined whether the breaker auxiliary contact 11 is in the closed state (off state), and when the breaker auxiliary contact 11 is in the closed state (interlock state), the breaker auxiliary contact 11 is in the interlock state. The closed state is maintained. When the circuit breaker auxiliary contact 11 is not in a closed state (not an interlock state), the signal is input to the microprocessor 40 through the second photo coupler 22 of the photo switch unit 20. In the microprocessor 40, the breaker contact 11 is not closed in the touch screen 50, and the disconnector auxiliary contact 11 is opened in the third relay driver 83 of the driving means 80. Outputs a control signal.

Accordingly, the third relay 73 receiving the drive signal from the third relay driver 83 operates to drive the motor 18 of the gas insulated switchgear 10 forward to open the disconnector auxiliary contact 12. .

4. Operation when disconnector auxiliary contact 12 of gas insulated switchgear 10 is open

When the disconnector auxiliary contact 12 is open, when the disconnecting command is input to the microprocessor 40 by switching on a switch (not shown) displayed on the touch screen 50, the microprocessor 40 It is determined whether the breaker auxiliary contact 11 is in the closed state (off state), and when the breaker auxiliary contact 11 is in the closed state (interlock state), the breaker auxiliary contact 11 is in the interlock state. Maintain the open state. When the circuit breaker auxiliary contact 11 is not in a closed state (not an interlock state), the signal is input to the microprocessor 40 through the first photo coupler 22 of the photo switch unit 20. The microprocessor 40 indicates that the breaker contact 11 is not closed on the touch screen 50 and closes the disconnector auxiliary contact 11 to the third relay driver 83 of the driving means 80. Outputs a control signal.

Accordingly, the third relay 73 receiving the driving signal from the third relay driver 83 operates to drive the motor 18 of the gas insulated switchgear 10 in reverse rotation to close the disconnecting auxiliary auxiliary contact 12. .

5. Operation when the earth switch auxiliary contact 13 of the gas insulated switchgear 10 is closed

When the ground switch auxiliary contact 13 is closed, when the command to open the ground switch auxiliary contact 13 by switching on a switch (not shown) displayed on the touch screen 50 is input to the microprocessor 40. When the circuit breaker auxiliary contact 11 is in a closed state (interlock state) by determining whether the circuit breaker auxiliary contact 11 is in a closed state (OFF state) by the microprocessor 40 and the microprocessor 40 The breaker auxiliary contact 11 and the disconnector auxiliary contact 12 are in the interlock state when the disconnector auxiliary contact 12 is in a closed state by determining whether the disconnection auxiliary auxiliary contact 12 is in the closed state. The closed state of the auxiliary contact 13 is maintained as it is. When the breaker auxiliary contact 11 is not closed (not an interlock state) and the disconnector auxiliary contact 12 is not closed, respectively, the breaker auxiliary contact 11 and the disconnector auxiliary contact 12 are Since the signal that is open is input to the microprocessor 40 through the first and second photo couplers 21 and 22 of the photo switching unit 20, the microprocessor 40 has a breaker on the touch screen 50. While the auxiliary contact 11 and the disconnector auxiliary contact 12 are not in a closed state, a control signal for opening the ground breaker auxiliary contact 13 to the third relay driver 83 of the drive means 80 is provided. Output

Accordingly, the third relay 73 receiving the drive signal from the third relay driver 83 operates to rotate the motor 18 of the gas insulated switchgear 10 forward to close the earth breaker auxiliary contact 13. Let's do it.

When the abnormal state of the gas insulated switchgear 10 is generated, sound is output from the speaker 90, and the touch screen 50 also expresses that the abnormal state of the gas insulated switch 10 occurs.

In the above description, the open / close state of the breaker auxiliary contact of the gas insulated switchgear, which is computed by the execution program stored in the ROM 30 in the microprocessor 40, the open / close state of the breaker auxiliary contact, and the ground switch auxiliary contact. All the data in the open / closed state of (13) and the open / closed state of the relay contact are displayed on the touch screen 50 as well as all of these calculation data are stored in the RAM 95 as well.

In the above description, the breaker auxiliary contact is mechanically interlocked with the breaker main contact. That is, when the breaker main contact changes from open to closed state, the breaker auxiliary contact

Change from open to closed.

That is, by reading the open / close state of the breaker auxiliary contact, we can know the open / close state of the breaker main contact.

Since high voltage is applied to the breaker main contact and high current flows, the breaker auxiliary contact can be used to know the open / close state of the breaker main contact. The same shall apply to the disconnector auxiliary contact and the earthing switch auxiliary contact.

In the above description, the specific embodiments have been shown and described, but the present invention is not limited thereto, for example, by those skilled in the art without departing from the concept of the present invention. Of course, the design can be changed in various ways.

As described above, according to the digital control device of the gas insulated switchgear according to the present invention, in the photo switching unit, the open / close state of the breaker auxiliary contact of the gas insulated switchgear, the open / close state of the breaker auxiliary contact, and the ground switch auxiliary contact 13 At least one of the signal for the open / closed state of the relay contact and the open / closed state of the relay contact is electronically switched, and the open / closed state of the breaker auxiliary contact of the gas insulated switchgear according to the switching of the photo switching unit by the microprocessor. At least one signal of the open / closed state of the breaker auxiliary contact, the open / closed state of the ground contactor auxiliary contact, and the open / closed state of the relay contact is received and operated according to the execution program stored in the ROM. Control the overall operation, and compute each Store the open / closed data of the point in RAM, receive the control signal output from the microprocessor on the touch screen, display the operation status and the screen to receive the user's command, and input the user's command, The gas density signal detected by the gas density sensor is received by the A / D converter, converted into a digital signal and output to the microprocessor, and the relay array drives at least one of the trip coil, the closing coil and the motor of the gas insulated switchgear. Since it is configured to drive control the relay array in response to the control signal output from the microprocessor to control, the gas insulated switch can be easily maintained and repaired, the wiring structure is simple, and the workability can be improved. To reduce manufacturing costs, while automating It has a very good effect.

1 is a block diagram schematically showing a digital control apparatus of a gas insulated switchgear according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: gas insulated switchgear 11: breaker auxiliary contact

12: Disconnector auxiliary contact 13: Ground switch auxiliary contact

14: relay contact 15: gas density sensor

16: Trip coil 17: Closing coil

18: motor 20: photo switching unit

21: First photo coupler 22: Second photo coupler

23: Third photo coupler 24: Fourth photo coupler

30: ROM 40: Microprocessor

50: screen switch 60: A / D converter

70: relay array 71: first relay

72: second relay 73: third relay

80: drive means 81: first relay drive unit

82: second relay driver 83: third relay driver

90: Speaker 95: RAM

100: digital controller

Claims (3)

Open / closed state of the breaker auxiliary contact 11 of the gas insulated switchgear 10, open / closed state of the disconnector auxiliary contact 12, open / closed state of the ground switch auxiliary contact 13, and The photo switching unit 20 which is electronically switched by receiving at least one signal of the open / closed state of the relay contact 14 and the gas insulated switch 10 of the gas switching unit 10 according to the switching of the photo switching unit 20. Signals for the open / closed state of the breaker auxiliary contact 11, the open / closed state of the disconnector auxiliary contact 12, the open / closed state of the ground switch auxiliary contact 13, and the open / closed state of the relay contact 14. The microprocessor 40 which receives the at least one signal and performs arithmetic processing according to an execution program stored in the ROM 30 and controls the entire operation, and opening / opening each contact processed by the microprocessor 40. Close the data A RAM 95 for storing, a touch screen 50 for receiving a control signal output from the microprocessor 40 to display an operation state and a screen for receiving a user's command and inputting a user's command, and the gas An A / D converter 60 which receives the gas density signal detected by the gas density sensor 15 by the gas density sensor 15, converts the gas density into a digital signal, and outputs the digital signal to the microprocessor 40; Drive control of the relay array 70 in response to a control signal output from the microprocessor 40 to drive control at least one of the trip coil 16, the closing coil 17, and the motor 18 of the switch 10. And a driving means (80) and a speaker (90) for outputting sound when an abnormal state of the gas insulated switchgear (10) occurs. The first photo coupler 21 according to claim 1, wherein the photo switching unit 20 receives the open / close signal of the breaker auxiliary contact 11 of the gas insulated switchgear 10 and switches on / off the first photo coupler 21. The second photo coupler 22 switched on / off by receiving the open / close signal of the disconnecting auxiliary contact 12 of the insulated switchgear 10 and the opening of the grounding switch auxiliary contact 13 of the gas insulated switchgear 10. A third photo coupler 23 that is switched on / off by receiving / closed signals and a fourth photo coupler 24 that is switched on / off by receiving an open / close signal of the relay contact 14 of the gas insulated switchgear 10. Digital control device of gas insulated switchgear composed of The microprocessor (40) of claim 1, wherein the driving means (80) is output from the microprocessor (40) to control the opening of the circuit breaker auxiliary contact (11) by exciting the trip coil (16) of the gas insulated switchgear (10). The first relay driver 81 driving the first relay 71 of the relay array 70 by receiving the open drive control signal of the breaker auxiliary contact 11, and the closing coil of the gas insulated switch 10. A second relay of the relay array 70 by receiving a close drive control signal of the breaker auxiliary contact 11 output from the microprocessor 40 to excite 17) to control the close of the breaker auxiliary contact 11. The second relay driver 82 driving the 72 and the motor 18 of the gas insulated switchgear 10 are rotated forward and reverse to open / close the disconnector auxiliary contact 12 and to assist the earth breaker. To open / close the contact 13 The third relay driver 83 receives the forward / reverse rotation drive control signal of the motor 18 output from the microprocessor 40 and drives the third relay 73 of the relay array 70. Control device for gas insulated switchgear.