KR101686249B1 - Digital Modularized Inter-Lock apparatus and method of construction thereof - Google Patents

Abstract

A digital modular interlock device applied to an interlock panel for controlling a field device including a circuit breaker, a disconnecting device, and a protective device mosaic receives an input of a state signal of a field device, and receives an input signal for converting surge and noise into a digital signal And a CPU for determining whether a digital signal corresponds to an interlock generated according to a function set for each of the on-site apparatuses, and a processing unit for monitoring the state of the CPU and a semiconductor device corresponding to each of the on- And an output unit for outputting a control signal for controlling the field device.

Description

[0001] The present invention relates to a digital modularized interlock device and a method of constructing the same,

The present invention relates to a digital modular interlock device and a construction method thereof. And more particularly, to a digital modular interlock device and a method of configuring a digital modular interlock device that maintain the performance of a panel using an electrical interlock based on analog technology.

An interlock (also referred to as an "ILC" hereinafter) controls the operation of the corresponding device when the setting condition is not satisfied electrically or mechanically, thereby preventing malfunction of the switching device such as a circuit breaker, disconnecting device, can do.

The electrical interlock means that the electric circuit is configured so that the control circuit or the chain synchronizing circuit of the mechanical locking device operates only in the openable / closable condition of the opening / closing device.

An ILC panel (hereinafter also referred to as "ILC PNL") with an electrical interlock corresponds to one of the control facilities of a 345 kV outdoor iron substation.

In ILC PNL, a single mechanical contact provided by a field device, for example, a circuit breaker, disconnector, protective device, etc., is multi-contacted using a protective relay. That is, the ILC PNL includes a circuit composed of a combination of multi-contacted contacts. Next, the ILC PNL provides output, for example, interlock information to the corresponding field devices.

The conventional ILC PNL includes a large number of reed switch relays and terminal blocks on the basis of analog technology, resulting in frequent coil disconnection due to poor connection and aged deterioration. Also, in the conventional ILC PNL, if the space is narrow, the circuit is complicated, so that it is difficult to find a fault location when a fault occurs, and it takes a long time to perform a repair.

In addition, if a fault occurs in the contact point of the ILC PNL, the protective relay may malfunction or malfunction, and a fault may occur in the transmission line, so that the reclosing relay may not operate. Further, there is a problem that malfunction occurs due to malfunction due to the release of the interlock, and scada and remote surveillance become impossible.

In this way, if the ILC PNL fails, it is impossible to recognize the situation, and it takes much time to grasp and repair the fault situation when a failure occurs in the power plant.

1. Japanese Unexamined Patent Publication No. 2002-10530 (Nov. 11, 2002)

It is an object of the present invention to provide a CPU-based digital modularized interlock device and method of configuring it, while maintaining the performance of an ILC PNL based on analog technology.

According to an aspect of the present invention, there is provided a digital modular interlock device applied to an interlock panel for controlling a field device including a circuit breaker, a disconnector,

An input unit for receiving a status signal of the field device and converting the status signal into a digital signal by removing surge and noise; A processor for determining whether the digital signal corresponds to an interlock generated according to a function set for each of the field devices, and for monitoring the state of the CPU; And an output unit for outputting a control signal for controlling the field device on the basis of the processing result of the processing unit using a semiconductor device corresponding to each of the field devices.

And the interlock corresponds to a condition for controlling the corresponding on-site device not to operate when the set condition is not satisfied for each on-site device.

And the input unit and the output unit are connected to the outside through a standardized connector.

Wherein the input unit comprises: an input protection unit for removing noise of the status signal; An opto-coupler for digitally converting the noise-removed state signal; And a gate for XORing a signal input from the photocoupler and determining whether an input contact point of the corresponding field device is abnormal based on the calculated result.

The input protection unit may include a noise filter circuit having one to five stages.

And the processing unit includes a power monitoring unit for monitoring the power of the cigarette oil at all times.

Wherein the output unit converts a digital processing signal corresponding to a processing result of the processing unit into an analog control signal and generates control command and equipment state information of the field device corresponding to the analog control signal; And an output protection unit for removing noise introduced through the output terminal of the output unit.

The control unit may include an insulated gate bipolar transistor (IGBT) corresponding to the semiconductor device.

And the output protection unit includes a noise filter circuit composed of one to three stages.

And a display lamp is used when a failure occurs as a result of self-diagnosis in the input unit, the processing unit, and the output unit.

According to another aspect of the present invention, there is provided a method of configuring a digital modular interlock device applied to an interlock panel for controlling a field device including a circuit breaker, a disconnector,

Receiving an input of the status signal of the field device, and removing the surge and noise from the status signal to convert the signal into a digital signal; Determining whether the digital signal corresponds to an interlock generated according to a function set for each of the field devices, and determining whether the digital signal corresponds to the interlock; and configuring a processor for monitoring the CPU core; And configuring an output unit for outputting a control signal for controlling the field device based on the processing result of the processing unit using the semiconductor device corresponding to each of the field devices.

Wherein the step of configuring the input unit comprises: constructing an input protection unit to remove noise of the status signal; Configuring an optocoupler for digital-converting the noise-removed state signal; And a gate configured to perform an XOR operation on the signal input from the photocoupler and to determine whether the input contact of the corresponding field device is abnormal based on the calculated result.

Wherein the step of configuring the input protection comprises: a one-stage noise filter including two capacitors; a two-stage noise filter including a reactance and a capacitor combination consisting of three capacitors; a three-stage noise filter including a gas discharge tube arrestor; And a 5-stage noise filter including a 4-stage noise filter and a capacitor.

The step of configuring the processing unit may further include the step of configuring a power monitoring unit to monitor the power of the cigarette oil at all times.

Wherein the step of configuring the output unit comprises the steps of: converting a digital processing signal corresponding to the processing result of the processing unit into an analog control signal, and configuring a control unit to generate control command and equipment status information of the equipment corresponding to the analog control signal; And an output protection unit for removing noise introduced through the output terminal of the output unit.

Wherein the step of configuring the output protection comprises a noise filter circuit comprising a one stage noise filter comprising a capacitor combination consisting of three capacitors, a two stage noise filter comprising a gas discharge tube arrestor and a three stage noise filter comprising a varistor .

According to the embodiment of the present invention, the digital modular interlock device and its constitution method can digitally modulate and non-contact the conventional analog-based interlock device to reduce the number of equipment failures.

In addition, according to the embodiment of the present invention, the digital modular interlock device and its configuration method can monitor the abnormality of the input section, the processing section, and the output section, .

1 is a block diagram schematically illustrating an environment in which a digital modular interlock device according to an embodiment of the present invention is applied.
2 is a block diagram illustrating a digital modular interlock device according to an embodiment of the present invention.
3 is a block diagram illustrating an input protection unit in an input unit according to an embodiment of the present invention.
4 is a configuration diagram showing a processing unit according to an embodiment of the present invention.
5 is a configuration diagram illustrating a control unit included in an output unit according to an embodiment of the present invention.
6 is a diagram illustrating an output protection unit including an output unit according to an embodiment of the present invention.
7 is a flowchart illustrating a method of configuring a digital modular interlock device according to an embodiment of the present invention.

The present invention will now be described in detail with reference to the accompanying drawings. Hereinafter, a repeated description, a known function that may obscure the gist of the present invention, and a detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shape and size of the elements in the drawings and the like can be exaggerated for clarity.

Hereinafter, a digital modular interlock system 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 illustrating an environment in which a digital modular interlock device according to an embodiment of the present invention is applied.

1, the digital modular interlock device 10 is applied to the ILC PNL and is connected to the ILC PNL by means of a field device such as at least one circuit breaker 20, a disconnector 30 and a protection circuit 40, Receives the status information, and transmits the control signal to the corresponding field device. The digital modularized interlock device 10 includes an input unit 100 for removing surge and noise from a status signal of a field device transmitted through an input contact of a field device and converting the state signal into a digital signal, A processing unit 200 for monitoring the state of a central processing unit (hereinafter also referred to as "CPU or CPU") for judging whether the interlock corresponds to an interlock generated by performing logicalization for each function, And a control signal for controlling the processing result of the processing unit 200 using the specific semiconductor device, that is, the control signal for controlling at least one of the circuit breakers 20, the disconnectors 30 and the protection circuit boards 40 And an output unit 300.

The interlock according to the embodiment of the present invention corresponds to a condition for controlling the corresponding on-site device not to operate when the set condition is not satisfied for each on-site device, but is not limited thereto.

The digital modularized interlock device 10 also normalizes the connection with the field device (at least one breaker 20, disconnector 30 and protective half mosaic 40) using a connector (not shown). Here, the connector has a socket-like structure, and erroneous connection can be prevented by fabricating different colors or terminal numbers for each socket-like structure.

This digital modularized interlock device 10 will be described in detail with reference to Fig.

2 is a block diagram illustrating a digital modular interlock device according to an embodiment of the present invention.

Referring to FIG. 2, the digital modular interlock device 10 includes an input unit 100, a processing unit 200, and an output unit 300.

The input unit 100 blocks surge and noise from the status signal of the field device input through the input terminal of the field device and converts the state signal into a digital signal. To this end, the input unit 100 includes an input protection unit 110, a photocoupler 120, and an XOR gate 150.

The input protection unit 110 protects the digital modular interlock device 10 from surges and noise by removing surges and noise corresponding to the respective state signals of the field devices.

The photocoupler 120 digitally converts the surge and noise-free state signals.

The XOR gate 150 XORs the output of the photocoupler 120.

The XOR gate 150 performs an XOR operation on signals input from two photocouplers corresponding to, for example, two field devices, and calculates the XOR of the input contacts ("a" and "b" It is judged whether or not it is abnormal. Here, "a" corresponds to an input condition, and "b " corresponds to an open condition. The input unit 100 transmits the digitally converted state signal to the processing unit 200 through a data bus (Data-BUS).

The processor 200 determines whether the digitally converted state signal corresponds to an interlock of the corresponding field device, and transmits an operation command or an interlock error alarm to the output unit 300, for example, as a result of the determination. Here, the interlock corresponds to a condition generated by performing logicalization for each function set to prevent a malfunction in each of the field devices.

The output unit 300 converts the digital processing signal corresponding to the processing result of the processing unit 200 into an analog control signal and transmits the converted analog control signal to the corresponding field device.

To this end, the output unit 300 includes a control unit 310, a protection relay 320, and an output protection unit 330.

The control unit 310 converts the digital processing signal into an analog control signal, and generates a control command and equipment state information (monitoring or alarm) of the field device corresponding to the analog control signal.

The protection relay 320 includes a keep function that maintains the magnetic contact and keeps the coil in a non-excitation mode at all times, and generates an output corresponding to the monitoring and alarm based on the keep function.

The output protection unit 330 protects the digital modular interlock device 10 from noise by removing noise corresponding to the output signals of the control unit 310 and the protection relay 320 using the noise filter circuit. do.

Next, the input protection unit 110 in the input unit 100 will be described in detail with reference to FIG.

3 is a block diagram illustrating an input protection unit in an input unit according to an embodiment of the present invention.

Referring to FIG. 3, the input protection unit 110 removes noise from a state signal input through an input terminal using a noise filter circuit composed of one to five steps, and outputs a noise-removed state signal to the photo- 120).

The first stage noise filter includes two capacitors C to reduce the size of the surge applied to the input terminal of the input unit 100 and remove the high frequency noise component using the charging characteristics of the capacitor.

The two-stage noise filter includes a capacitor combination composed of a reactance (L) and three capacitors (C), which secondarily reduces the surge size at the output of the one-stage noise filter and removes the high-frequency noise component. Here, in the capacitor combination, the surge is discharged to the ground.

The three stage noise filter includes a gas discharge tube (B) arrestor, which is used to discharge surges not removed from the output of the two stage noise filter.

The four stage noise filter includes a varistor (V), which is used to reduce the surge size at the output of the three stage noise filter. Here, the varistor V corresponds to a device whose resistance varies according to the magnitude of the input voltage of the four-stage noise filter.

The 5-stage noise filter includes a capacitor C, which ultimately removes noise from the state signal by bypassing the high-frequency component at the output of the 4-stage noise filter.

Next, the processing unit 200 will be described in detail with reference to FIG.

4 is a configuration diagram showing a processing unit according to an embodiment of the present invention.

Referring to FIG. 4, the processing unit 200 includes a power monitoring unit 210 and a CPU 220.

Specifically, the power monitoring unit 210 monitors the power supply of the CPU 220 at all times and controls the CPU 220 based on the monitored result. For example, when the power monitoring unit 210 receives an abnormal signal from the CPU 220 while monitoring the power of the CPU 220, the power monitoring unit 210 transmits a reset signal to stop the operation of the CPU 220, ).

The CPU 220 determines whether or not the digitally converted state signal corresponds to the interlock of the facility, and transmits the operation command or interlock error alarm to the output unit 300, for example, as a result of the determination. Here, the interlock corresponds to a condition created by performing logicalization for each function set to prevent malfunction in each facility.

That is, the CPU 220 can perform the logicalization according to the set function, so that the user can apply it to all types of interlock devices without replacing the interlock device by simply changing the interlock through firmware upgrade (firmware up-grade) .

Next, the control unit 310 included in the output unit 300 will be described in detail with reference to FIG.

5 is a configuration diagram illustrating a control unit included in an output unit according to an embodiment of the present invention.

5, the control unit 310 converts a digital processing signal into an analog control signal, and generates a control command of the field instrument corresponding to the analog control signal and state information (monitoring or alarm) of the field instrument. To this end, the control unit 310 includes an IGBT (Insulated Gate Bipolar Transistor) 311 and a photocoupler 312.

The IGBT 311 converts the digital processing signal into an analog control signal.

The photo coupler 312 diagnoses the signal state by comparing the output signal of the IGBT 311 converted into the analog control signal with the output signal of the processing unit 200, that is, the input signal of the control unit 310.

Next, the output protection unit 330 included in the output unit 300 will be described in detail with reference to FIG.

6 is a diagram illustrating an output protection unit including an output unit according to an embodiment of the present invention.

Referring to FIG. 6, the output protection unit 330 removes noise introduced from the output terminal using the noise filter circuit composed of the first to third steps.

The first stage noise filter includes a capacitor combination composed of three capacitors (C), which removes the high frequency noise components flowing from the output terminal. Here, in the capacitor combination, the surge is discharged to the ground.

The two-stage noise filter includes a gas discharge tube (B) arrestor, which is used to discharge surges not removed from the output of the first stage noise filter.

The three stage noise filter includes a varistor (V), which is used to reduce the surge size at the output of the two stage noise filter. Here, the varistor V corresponds to a device whose resistance varies according to the magnitude of the input voltage of the three-stage noise filter.

The digital modular interlock device 10 according to the embodiment of the present invention includes a self diagnosis function in the input unit 100, the processing unit 200, and the output unit 300, respectively. In addition, when a malfunction occurs as a result of self-diagnosis, the digital modular interlock device 10 can display information corresponding thereto by using an indicator lamp (not shown) of the enclosure.

In addition, the digital modular interlock device 10 according to the embodiment of the present invention includes ventilation holes (not shown) on the upper and lower parts of the apparatus so that heat can be easily released from the apparatus. Do.

Next, a method of configuring the digital modular interlock device will be described in detail with reference to FIG.

7 is a flowchart illustrating a method of configuring a digital modular interlock device according to an embodiment of the present invention.

First, a method for constructing a digital modular interlock device according to an embodiment of the present invention includes an input unit 100 including a self-diagnosis function, a processing unit 200, and an output unit 300, Based on digital modularization and contactlessness.

Referring to FIG. 7, a method for constructing a digital modular interlock device (hereinafter also referred to as "interlock device configuration method") removes surge and noise from each of the state signals of the field devices, Thereby constituting a noise filter circuit (S710).

The interlock device configuration method configures the photocoupler 120 for digital-converting the noise-removed state signal in the noise filter circuit (S720). At this time, the photocoupler 120 is configured to correspond to each state signal of the equipment corresponding to the input contact point of the field device.

In the interlock device construction method, a gate 150 for determining whether the input contact 30 of the field device is abnormal based on the result of the XOR operation of the signal input from the two photocouplers 120 (S730) . Here, the gate 150 corresponds to an XOR gate performing an XOR operation.

As such, the interlock device construction method constitutes an input including a noise filter circuit, photocoupler 120, and gate 150.

Next, the interlock device configuration method includes a processing unit 200 including a CPU 220 for determining whether a digitally converted status signal corresponds to an interlock of the facility, and a power monitoring unit 210 for constantly monitoring the power of the CPU 220. [ (S740).

The interlock device configuration method outputs a control signal for controlling the processing result of the processing section 200 using a specific semiconductor device, that is, the electric power facility, for example, the breaker 20 / disconnector 30 or the protection panel mosaic 40 And configures the output unit 300 (S750). Here, the specific semiconductor corresponds to the IGBT 311, but is not limited thereto.

The method for constructing the interlock device also includes a noise filter circuit for eliminating the noise introduced from the output terminal of the output unit 300 in the construction of the output unit 300.

Accordingly, the present invention modularizes and smartens a conventional analog-based interlock device to be applicable to a plurality of types of single models, and thereby allows a user to quickly and accurately determine a faulty error through self diagnosis and state error diagnosis of power equipment And to take action.

As described above, an optimal embodiment has been disclosed in the drawings and specification. Although specific terms have been employed herein, they are used for purposes of illustration only and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10; A digital modular interlock device 100; Input
110; An input protection unit 120; Photo coupler
150; XOR gate 200; Processing unit
210; A power monitoring unit 220; CPU
300; An output unit 310; The control unit
311; IGBT 312; Photo coupler
320; Protective relay 330; Output protection unit
20; A breaker 30; Breaker
40; Protection class mosaic

Claims (16)

1. A digital modular interlock device applied to an interlock panel for controlling a field device including a circuit breaker,
An input unit for receiving a status signal of the field device and converting the status signal into a digital signal by removing surge and noise;
A processor for determining whether the digital signal corresponds to an interlock generated according to a function set for each of the field devices, and for monitoring the state of the pipe; And
And an output unit for outputting a control signal for controlling the field device on the basis of the processing result of the processing unit by using the semiconductor device corresponding to each of the field devices
And a digital modulated interlock device. The method according to claim 1,
Wherein the interlock corresponds to a condition for controlling the corresponding on-site device not to operate when the set condition is not satisfied for each on-site device. The method according to claim 1,
Wherein the input unit and the output unit are connected to the outside through a standardized connector. The method according to claim 1,
The input unit
An input protection unit for removing noise of the status signal;
An opto-coupler for digitally converting the noise-removed state signal; And
An XOR operation of the signal input from the photocoupler, and a gate for determining whether the input contact of the corresponding field device is abnormal based on the result of the XOR operation
And a digital modulated interlock device. The method of claim 4,
The input protection unit
And a noise filter circuit composed of the first to fifth steps. The method according to claim 1,
The processing unit
And a power monitoring unit for monitoring the power of the cube oil at all times. The method according to claim 1,
The output
A control unit for converting a digital processing signal corresponding to the processing result of the processing unit into an analog control signal and generating a control command and facility state information of the field device corresponding to the analog control signal; And
An output protection unit for removing noise introduced through the output terminal of the output unit,
And a digital modulated interlock device. The method of claim 7,
Wherein the control unit includes an insulated gate bipolar transistor (IGBT) corresponding to the semiconductor device. The method of claim 7,
The output protection unit
And a noise filter circuit composed of one to three stages. The method according to claim 1,
And a display lamp is used for display when a failure occurs as a result of self-diagnosis at the input unit, the processing unit, and the output unit. A method of configuring a digital modular interlock device for application to an interlock panel for controlling a field device including a circuit breaker,
Receiving an input of the status signal of the field device, and removing the surge and noise from the status signal to convert the signal into a digital signal;
Determining whether the digital signal corresponds to an interlock generated according to a function set for each of the field devices, and determining whether the digital signal corresponds to the interlock; and configuring a processor for monitoring the CPU core; And
Configuring an output unit for outputting a control signal for controlling the field device on the basis of the processing result of the processing unit using the semiconductor device corresponding to each of the field devices
Wherein the interlock device is a digital modular interlock device. The method of claim 11,
The step of configuring the input section
Configuring an input protection unit to remove noise of the status signal;
Configuring an optocoupler for digital-converting the noise-removed state signal; And
A step of XORing a signal inputted from the photocoupler and a gate for judging whether there is an abnormality of the input contact of the relevant field device based on the result of the calculation
Wherein the interlock device is a digital modular interlock device. The method of claim 12,
The step of configuring the input protection unit
A two-stage noise filter including a reactance and a condenser combination of three capacitors, a three-stage noise filter including a gas discharge tube arrestor, a four-stage noise filter including a varistor, and a one- And a noise filter circuit including a five-stage noise filter including a capacitor of the first-stage noise filter. The method of claim 11,
The step of configuring the processing unit
Further comprising the step of configuring a power monitoring unit to monitor the power of the cube oil at all times. The method of claim 11,
The step of configuring the output
Converting a digital processing signal corresponding to a processing result of the processing unit into an analog control signal and configuring a control unit for generating control commands and equipment status information of the equipment corresponding to the analog control signal; And
Forming an output protection unit for removing noise introduced through an output terminal of the output unit
Wherein the interlock device is a digital modular interlock device. 16. The method of claim 15,
The step of configuring the output protection section
Stage noise filter including a capacitor combination composed of three capacitors, a two-stage noise filter including a gas discharge tube arrestor, and a three-stage noise filter including a varistor. Of the interlock device.

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