KR101712985B1 - Protective Relay Easing AS Difficulty - Google Patents

Abstract

The protection relay according to the present invention includes: a through-type CT through which a power line passes; A control power supply unit for supplying DC power; And an I / O unit for performing a digital input function and a digital output function, wherein the protection relay includes a first module 100 and a second module 200 , At least the through-type CT (121) is configured to be connected to the first module (100), and at least the control power supply unit and the I / O unit are configured to be separated from the second module (200) .
According to the present invention, it is possible to improve the convenience of the AS when performing AS of the protection relay in response to most of the AS factors, and the operation for repairing and replacing a faulty or damaged part becomes very simple, and the first module 100 and the second module It is possible to improve the reliability of a signal transmitted between the base station 200 and the base station.

Description

Protective Relay Easing AS Difficulty "

The present invention relates to a protective relay improved in the convenience of an AS, and more particularly, to a protective relay capable of AS without removing a power line from a through hole of a protective relay in accordance with most types of failure of the protective relay.

1 is a view showing an example of a conventional conventional CT built-in protection relay.

Referring to FIG. 1, a power line is connected to a through-hole 11 through a motor or the like to be protected.

Since the power line passes through the through hole 11 of the protection relay 10, if an AS such as a failure occurs in the protection relay 10 and the protection relay 10 needs to be replaced, It is necessary to interrupt the electric power supply of the protection relay 10 and extract the power line from the through hole 11 of the protection relay 10 and inserting the power line into the through hole 11 of the new protection relay 10. [

Accordingly, there is a problem in that the operation of a motor or the like to be protected must be stopped for the conventional AS built-in protection relay. In addition, a crimp terminal is formed at the end of the power line. Since the outer size of the crimp terminal is often larger than the through-hole 11, the power line can be taken out through the through-hole 11 only when the crimp terminal is usually cut. As a result, there is a problem in that a work process for cutting and attaching a crimp terminal is required in addition to the conventional AS for a CT built-in protective relay. If there is not enough space in the power line for the length of the cut crimp terminal, There is also a problem.

Meanwhile, when the external CT module is used, the above problem can be solved to some extent. However, since the external CT module and the main body must be connected by using a cable, there is a problem of lowering the reliability of the measurement due to the cable transmission of the signal .

The recognition of the problems and problems of the prior art is not obvious to a person having ordinary skill in the art, so that the inventive step of the present invention should not be judged based on the recognition based on such recognition I will reveal.

An object of the present invention is to provide a protection relay improved in convenience of the AS.

It is also an object of the present invention to provide a protection relay having improved reliability of measurement and improved convenience of AS.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

According to an aspect of the present invention, there is provided a protection relay comprising: a penetrating CT through which a power line passes; A control power supply unit for supplying DC power; And an I / O unit for performing a digital input function and a digital output function, the protective relay comprising:

Wherein the protection relay is implemented as a plurality of modules including a first module 100 and a second module 200 that are physically detachable or detachable from each other and at least the through-type CT 121 is connected to the first module 100, At least the control power supply unit and the I / O unit are separately configured in the second module (200).

In the protection relay, the first module (100) having the through-type CT (121) stores calibration data for the through-type CT (121).

In the protection relay, a first connector (141) is formed on one side of the first module (100), a second connector (241) is formed on a side of the second module (200) The power supply and the signal are exchanged between the first module 100 and the second module 200 by using the connector 141 and the second connector 241. [

The protection relay may further include a bracket 300 to which at least the second module 200 is detachably fixed.

A second hook guider 211 is formed on the bottom surface of the second module 200 and the second hook guider 211 is guided to the upper surface of the bracket 300 The third hook guider 322 is formed.

In the protection relay, a first connector (141) is formed in the first module (100), a second connector (241) is formed in the second module (200), and the first module The first connector 141 and the second connector 241 are formed on the sides of the second module 200 facing each other and the second module 200 slides with respect to the bracket 300, The first connector 141 and the second connector 241 are coupled to or separated from each other.

The second module 200 can be fastened to the bracket 300 and the second module 200 can be fastened to the second module 200 at a side opposite to the side where the second module 200 faces the first module 100. [ And a fastening stopper (410) for supporting the fastening stopper (410).

In the protection relay, a breaker state signal and an external operation command signal are input using the digital input function, and a control signal for an overcurrent alarm signal and a magnetic contactor MC is output using the digital output function .

In the protective relay, the first module (100) includes: an arithmetic and control unit for performing measurement on the power line using at least the current signal obtained by the CT and performing control for protection relay; And a display unit for displaying the results of the measurement and the information for the protection relay.

In the protection relay, the I / O unit of the second module 200 may include an I / O circuit that generates a digital output signal under the control of the arithmetic control unit and provides a digital input signal to the arithmetic control unit; And an I / O connector 260 connected to the I / O circuit.

In the protection relay, the second module 200 may include a second PCB module 240 in which the control power supply unit and the I / O circuit are formed; And a third PCB module 250 on which the I / O circuit is formed.

According to one aspect of the present invention, there is an effect that the convenience of the AS is improved when the protection relay is AS corresponding to the AS factor.

According to one aspect of the present invention, there is an effect that the operation for repairing and replacing a faulty or damaged part becomes very simple, and reliability of a signal transmitted between the first module 100 and the second module 200 is improved There is an effect that can be improved.

According to an aspect of the present invention, even if the second module 200 is replaced, the calibration data corresponding to the loaded CT is not changed, so calibration is not performed again due to the replacement.

1 is a diagram showing an example of a conventional conventional protection relay.
2 is a perspective view showing a state in which a protection relay according to an embodiment of the present invention is mounted.
FIG. 3 is a perspective view illustrating a first module, a second module, a bracket, a fastening stopper, and the like, which constitute a protective relay according to an embodiment of the present invention.
4 is a perspective view of the first module according to an embodiment of the present invention.
5 is a perspective view illustrating a second module according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: FIG. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention in the drawings, parts not related to the description are omitted, and similar names and reference numerals are used for similar parts throughout the specification.

FIG. 2 is a perspective view illustrating a state in which a protection relay according to an embodiment of the present invention is mounted. FIG. 3 is a perspective view illustrating a first module, a second module, a bracket, A stopper, and the like.

The protection relay according to an embodiment of the present invention includes a first module 100, a second module 200, a bracket 300, and the like.

The brackets 300 can be attached to the panel 2 in two ways. First, mounting wings 510 (see FIG. 5) are mounted on the mounting wing mounting holes 310 formed on the left and right sides and / The bracket 300 can be mounted on the panel 2 by using the screw bolt 520. [ Alternatively, the rail 1 may be detachably attached to the rail 1 by using a rail mounting portion (not shown) formed on the bottom surface of the bracket 300 after the standard rail 1 is mounted on the panel 2 have.

The first module 100 and the second module 200 are detachably fixed to the bracket 300.

A first hook guider 113 is formed on the bottom surface of the first module 100 and a second hook guider 211 is formed on the bottom surface of the second module 200. On the upper surface of the bracket 300, A third hook guider 322 is provided which guides the first hook guider 211 and the second hook guider 211 to allow only linear movement.

The first rib 112 of the first module 100 is guided by matching with the second rib 323 of the bracket 300. When the first module 100 is mounted on the bracket 300 and is pushed to the left, The first module 100 can be positioned on the left side of the bracket 300 while the left end of the first rib 112 is blocked by the rib stopper 321 of the bracket 300 do.

When the first module 100 is mounted on the bracket 300 and then the second module 200 is mounted on the bracket 300 and then also pushed to the left side, the second module 200 is moved by the first module 100 The clamping stopper 410 is fixed to the second module 200 and further to the first module 100. The clamping stopper 410 is mounted on the bracket 300 and fixed by the bolts 420, To slide to the right to prevent it from deviating.

The locking stopper 410 can be fastened to the bracket 300 and supports the second module 200 on the opposite side to the side where the two modules 200 face the first module 100 do.

5) is formed on the first module 100 and the second module 200 is formed on the first module 100. The first module 100 and the second module 200 The first connector 141 and the second connector 241 are formed on the sides of the first connector 200 facing each other.

The first connector 141 of the first module 100 and the second connector 241 of the second module 200 are connected to each other when the second module 200 is pushed to the left in a state where the first module 100 is mounted, . The first module 141 and the second connector 241 are coupled or separated from each other by sliding the second module 200 to the left or right with respect to the bracket 300 in a state in which the first module 100 is mounted .

FIG. 4 is a perspective view illustrating a first module according to an embodiment of the present invention, and FIG. 5 is a perspective view illustrating a second module according to an embodiment of the present invention.

The first module 100 includes a first front case 131, a first rear case 132, a top case 133, three through CTs 121, a ZCT 122 and a first PCB module 140, .

The through CTC 121 and the ZCT 122 are fixed to the space formed by the first front case 131 and the second front case 132 and the first front case 131 and the second rear case 132 The first PCB module 140 is fixed to the space formed by the upper case 132 and the top case 133.

The first module 100 is provided with a through type CT 121 through which a power line passes, and the first module 100, which characteristically comprises a through type CT 121, receives calibration data for the through type CT 121 The calibration data may be stored in a memory device or an MCU configured in the first PCB module 140.

Since the produced CT 121 has a variation range in its characteristic value due to a small tolerance in manufacturing, calibration data for correction is used for accurate measurement. In an embodiment of the present invention, 1 module 100. Even if the second module 200 is replaced, the calibration data corresponding to the mounted CT 121 does not change, and calibration is not performed again due to replacement . On the other hand, in the case of using the conventional external CT, there is a problem that calibration is required again after replacing the failed main body.

The first PCB module 140 of the first module 100 may include a first connector 141 formed on a PCB substrate 144, an ADC, an operation control unit, an operation unit, and a display unit 142.

The ADC provides the current data to the operation control unit by analog-to-digital conversion of the current signal obtained by the CT 121, and the operation control unit uses the current signal obtained by the CT 121, more specifically, The power line can be measured using the current data provided by the controller, the control for the protection relay can be performed, and the components of the protection relay can be controlled.

The display unit 142 displays the result of the measurement and information for the protection relay, and may be configured by, for example, an LED module or an LCD module. The operation unit includes a switch 143 for receiving a command from the user .

The first connector 141 corresponds to the second connector 241 of the second module 200 and transmits and receives power and signals between the first module 100 and the second module 200.

The second module 200 includes a second front case 231, a second rear case 232, a second PCB module 240, a third PCB module 250, and an I / O connector 260 Lt; / RTI >

The second PCB module 240, the third PCB module 250 and the I / O connector 260 are mounted and fixed in a space between the second front case 231 and the second rear case 232. [

The control power supply unit may be configured on the second PCB module 240 to supply DC power to the first module 100 and the second module 200, respectively. The DC power generated by the control power supply unit of the second module 200 may be supplied to the first module 100 through the second connector 241 and the first connector 141. [

The I / O part performs the digital input (DI) function and the digital output (DO) function and inputs the breaker status signal and the external operation command signal to the protective relay by using the digital input (DI) DO) function to output an overcurrent alarm signal and a control signal for the magnetic contactor (MC).

The I / O section of the second module 200 includes an I / O circuit that generates a digital output signal under the control of the arithmetic control section and provides a digital input signal to the arithmetic control section, an I / O circuit And a connector 260 as shown in FIG. The I / O connector 260 may be formed in the second PCB module 240 and the third PCB module 250. The I / O connector 260 may be formed in the second front case 231 and the second rear case 232 Respectively.

The I / O circuit is connected to the operation control section of the first module 100 via the second connector 241 and the first connector 141. The I / O circuit receives the digital input DI and provides it to the operation control section, It is possible to generate the digital output (DO) in accordance with the command of FIG.

The protection relay includes a through-type CT 121 through which the power line passes, a control power supply unit for supplying DC power; An I / O unit for performing a digital input function and a digital output function, and an operation control unit for performing measurement for a power line using the current signal obtained by the CT 121 and performing control for protection relay .

The present invention is implemented as a plurality of modules including a first module 100 and a second module 200 which are physically detachable from or separated from each other, 1 module 100, at least the control power supply unit and the I / O unit are separated from each other in the second module 200.

Analysis of the AS factor in the protection relay shows that the control power supply part for supplying the DC power or the digital input function and the I / O part performing the digital output function are mostly damaged due to failure or external factors. The controller finds that the frequency of failure or damage is low.

Accordingly, when an AS occurs in the protection relay, only the second module 200 may be replaced or repaired according to an aspect of the present invention. At this time, the first module 100 through which the power line passes may be removed or the first module 100 It is not necessary to remove the power line. Therefore, it is effective to greatly improve the convenience of the AS when the protection relay is AS in most types of faults.

 In addition, even if the second module 200 is detached, the contact state of the magnetic contactor can be maintained depending on the operation mode of the magnetic contactor MC in the path for supplying power to the motor or the like to be protected. There is an effect that AS can be performed while maintaining the operating state of the motor or in the uninterrupted state when the protection relay is AS corresponding to most of the AS factors according to one aspect of the present invention.

The first connector 141 formed on one side of the first module 100 and the second connector 241 formed on one side of the second module 200 are coupled to each other, The first module 100 and the second module 200 transmit and receive power and signals between the first module 100 and the second module 200 using the first module 100 and the second module 200, The first connector 141 and the second connector 241 are formed and the second module 200 slides relative to the bracket 300 so that the first connector 141 and the second connector 241 are coupled to each other Separated.

If the second module 200 is slid to the right by sliding the first module 141 and the second module 200 when the second module 200 is removed and the closure stopper 410 is released to replace or repair the second module 200, The first connector 141 and the second connector 241 are coupled together when the second module 200 is pushed to the left to mount the new second module 200. [

According to one aspect of the present invention, there is an effect that the operation for repairing and replacing a faulty or damaged part becomes very simple. In addition, since the length of the signal path is very short without using a separate cable between the first module 100 and the second module 200, the reliability of the transmitted signal can be improved.

100: first module 111:
112: first rib 113: first hook guider
141: first connector 200: second module
211: second hook guider 241: second connector
300: Bracket 310: Mounting Wing
321: rib stopper 322: third hook guider
323: second rib 410: fastening stopper
510: Mounting wing

Claims (11)

Penetrating CT through power line; A control power supply unit for supplying DC power; And an I / O unit for performing a digital input function and a digital output function, the protective relay comprising:
Wherein the protection relay is implemented as a plurality of modules including a first module 100 and a second module 200 that are physically detachable or detachable from each other and at least the through-type CT 121 is connected to the first module 100, , At least the control power supply unit and the I / O unit are separately configured in the second module (200)
The control power supply unit configured in the second module 200 supplies DC power to the first module 100 as well as the second module 200,
The I / O unit included in the second module 200 outputs at least a control signal for the magnetic contactor MC,
The first module 100 configured with the through-type CT 121 stores calibration data for the through-type CT 121,
A protection relay characterized by delete The method according to claim 1,
A first connector 141 is formed on one side of the first module 100 and a second connector 241 is formed on a side of the second module 200,
A signal is transmitted between the first module 100 and the second module 200 using the first connector 141 and the second connector 241,
A protection relay characterized by The method according to claim 1,
Further comprising: a bracket (300) detachably secured to at least the second module (200)
A protection relay characterized by The method of claim 4,
A second hook guider 211 is formed on the bottom surface of the second module 200,
And a third hook guider 322 guiding the second hook guider 211 and allowing only linear movement is formed on the upper surface of the bracket 300. [
A protection relay characterized by The method of claim 5,
A first connector 141 is formed in the first module 100 and a second connector 241 is formed in the second module 200. The first module 100 and the second module 200 are connected to each other, The first connector 141 and the second connector 241 are formed on the side surfaces facing each other,
The first connector 141 and the second connector 241 are coupled to or separated from each other by sliding the second module 200 with respect to the bracket 300,
A protection relay characterized by The method of claim 5,
The second module 200 may be coupled to the bracket 300 and may include a fastening stopper 410 for supporting the second module 200 on the other side opposite to the side where the second module 200 faces the first module 100 ); ≪ / RTI >
A protection relay characterized by The method according to claim 1,
And a controller for inputting a breaker state signal and an external operation command signal using the digital input function,
A protection relay characterized by The method according to claim 1,
The first module (100)
An arithmetic and control unit for performing the measurement for the power line using at least the current signal obtained by the CT and performing control for the protection relay;
And a display unit for displaying a result of the measurement and information for protective relay,
A protection relay characterized by The method of claim 9,
The I / O unit of the second module 200 may be connected to the I /
An I / O circuit for generating a digital output signal under control of the operation control unit and providing a digital input signal to the operation control unit;
And an I / O connector (260) connected to the I / O circuit.
A protection relay characterized by The method of claim 10,
The second module (200)
A second PCB module 240 in which the control power supply unit and the I / O circuit are formed;
And a third PCB module 250 on which the I / O circuit is formed.
A protection relay characterized by

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