KR101144278B1 - Terminal for metering out fit protection - Google Patents

Terminal for metering out fit protection Download PDF

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Publication number
KR101144278B1
KR101144278B1 KR1020100093465A KR20100093465A KR101144278B1 KR 101144278 B1 KR101144278 B1 KR 101144278B1 KR 1020100093465 A KR1020100093465 A KR 1020100093465A KR 20100093465 A KR20100093465 A KR 20100093465A KR 101144278 B1 KR101144278 B1 KR 101144278B1
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KR
South Korea
Prior art keywords
phase
current
signal
input
terminal
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KR1020100093465A
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Korean (ko)
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KR20120031840A (en
Inventor
김석곤
박창호
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한국전력공사
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Priority to KR1020100093465A priority Critical patent/KR101144278B1/en
Priority to PCT/KR2011/007084 priority patent/WO2012044031A2/en
Publication of KR20120031840A publication Critical patent/KR20120031840A/en
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Publication of KR101144278B1 publication Critical patent/KR101144278B1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/142—Arrangements for simultaneous measurements of several parameters employing techniques covered by groups G01R15/14 - G01R15/26

Abstract

The present invention relates to a terminal block for protecting a transformer for a meter.
According to an embodiment of the present invention, a power measuring device in which a CT is connected to the A phase and C phase and a CT is further connected to the midline (N phase) to measure the power of the 3 phase 4 wire type power line using the 2CT transformer in the terminal block, connected to the 2CT transformer and CT of the three-phase four-wire receive the input voltage and current of the power line, 1S k, P1, 1S l, 3S l, NS l, P2, 3S k, P3, P0, NS k P1, 2S, P2, 3S, P3, P0, 3L, 3S, P3, P3, P3, P3, P3, P3, P3, P3, P3, , 2L, and 1L, and a protective system unit connected to an input line to which the input terminal unit and the output terminal unit are connected, and which controls a short circuit or an opening of a terminal to which a current is inputted, Is provided.

Description

{TERMINAL FOR METERING OUT FIT PROTECTION}

The present invention relates to a terminal block for protecting a transformer for a meter.

Most of the major power users in Korea are in the 154kV transmission line and some of the very large ones are in the 345kV transmission line. In such 154kV and 345kV transmission systems, three-phase three-wire system, which is an effective grounding system, is in operation for system protection and insulation cooperation of power facilities.

The distribution system operates as a 22.9 kV three-phase four-wire multiple-ground system, which is used as a supply system with a capacity of less than 10,000 kW. In Korea, the 22.9kV system is measured by 3-phase 4-wire system (3-element system) and some 154kV system is measured by 3-phase 3-wire system (2-element system).

Therefore, the neutral point of the transformer is directly grounded, and some 154kV customers who are measured by the two-element method are experiencing problems in the fair trade due to a shortage of metering in the amount of electricity used for trading rather than actual usage.

Further, the metering unit for the instrument can be opened by detachment of the watt hour meter when measuring the amount of power. If the instrumental transformer is opened like this, the instrumental transformer can be damaged by the high current.

The present invention provides a terminal block for protecting a transformer for a meter for protecting a current transformer included in a transformer for a meter when measuring a power amount of a power system.

The present invention is to provide a terminal block for protecting a transformer for an instrument for preventing miswiring between a transformer for a meter and a terminal block.

According to an aspect of the present invention, there is provided a terminal block for protecting a transformer for a meter.

According to one embodiment of the present invention, three-phase, four-wire from the power measurement device mounted to the power line receives the input voltage and current of the power line, 1S k, P1, 1S l, NS l, P2, 3S k, P3, P0, terminal to which the input terminal, the output to the power meter of the current and voltage inputted to the input terminal measures the power of the three-phase four-wire power line is arranged in the order of NS k and, 1S, P1, 2S, P2, 3S, P3, P0, 3L, 2L, and 1L, and a protection system unit that is connected to an extension line to which the input terminal unit and the output terminal unit are connected and controls a short circuit or an opening of a terminal to which a current is inputted. A terminal block is provided.

The terminal block for protecting a transformer for an instrument according to an embodiment of the present invention can prevent the current transformer from being damaged by a large current when the transformer for instrument is opened on the secondary side due to desorption and other reasons of the wattmeter.

The terminal block for protecting a transformer for a meter according to an embodiment of the present invention can prevent a power failure such as a ripple failure and a power outage by preventing damage to a current transformer included in a transformer for a meter.

The terminal block for protecting a transformer for a meter according to an embodiment of the present invention can prevent misconnection by rearranging a terminal connected to the transformer for a meter so that the wiring connection method is simple.

1 is a block diagram showing a terminal block for protecting a transformer for a meter according to an embodiment of the present invention.
2 is an exemplary view showing a terminal arrangement procedure of a terminal block for protecting a transformer for a meter according to an embodiment of the present invention.
FIG. 3 is a view illustrating an example of a protective system according to an embodiment of the present invention.
4 is an exemplary view showing the inside of a terminal block for protecting a transformer for a meter according to an embodiment of the present invention.
5 is an exemplary view showing the inside of a terminal block for protecting a transformer for a meter according to another embodiment of the present invention.
6 is a diagram illustrating a method for measuring a power of a three-phase four-wire system using a transformer for a 2CT instrument by applying a terminal block for protecting a transformer for an instrument according to an embodiment of the present invention.

While the present invention has been described in detail, it is clearly understood that the same is by way of illustration and illustration, and it is not to be construed as limiting the present invention. It is to be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalent or alternatives, which fall within the spirit and scope of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In addition, numerals (e.g., first, second, etc.) used in the description of the present invention are merely an identifier for distinguishing one component from another.

Also, in this specification, when an element is referred to as being "connected" or "connected" with another element, the element may be directly connected or directly connected to the other element, It should be understood that, unless an opposite description is present, it may be connected or connected via another element in the middle.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a terminal block for protecting an instrument transformer according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a terminal block for protecting a transformer for a meter according to an embodiment of the present invention.

The instrument transformer protection terminal block 100 includes an input terminal portion 110, an output terminal portion 150, and a protective conductor portion 130.

The input terminal unit 110 receives the voltage or current of the power line from the instrumental transformer. For example, the instrumental transformer may be a transformer transformer for the instrument. In addition, the power line may be a power line of a three-wire four-wire system.

The output terminal unit 150 is connected to the input terminal unit 110 via an extension line. That is, the output terminal unit 150 receives the voltage and current of the power line detected by the instrumental transformer from the input terminal unit 110. The output terminal unit 150 is connected to the input terminal of the watt-hour meter.

The protection controller 130 protects the instrument transformer 200 using the current input from the instrument transformer 200.

The protection controller 130 constantly monitors the current flowing in an extension line connecting the input terminal unit 110 and the output terminal unit 150. The protection controller 130 monitors the current of the extension line to detect whether the secondary side of the instrumentation transformer is opened due to the detachment of the watt hour meter or the like. When the protection transformer 130 detects the opening of the instrument transformer, it short-circuits the extension corresponding to the open phase of the A-phase, B-phase, C-phase and N-phase to protect the instrument transformer. Here, the A-phase, the B-phase, and the C-phase are power lines for transmitting power supplied from a power source such as a generator. Here, the highest voltages generated on the A phase, the B phase, and the C have a time difference of 120 degrees, respectively. The N phase is the neutral point, which is the point where all of the A phase, the B phase and the C phase are connected.

2 is an exemplary view showing a terminal arrangement procedure of a terminal block for protecting a transformer for a meter according to an embodiment of the present invention.

Referring to FIG 2, an input terminal 110 are arranged in the order of k 1S, P1, l 1S, 3S l, NS l, P2, 3S k, P3, P0, NS k.

1S k is connected to the A-phase CT and receives the power-source current detected from the A-phase CT. Here, the power source means a power source that supplies the same power as a power plant.

P1 is connected to the A-phase PT and receives the voltage detected from the A-phase PT.

1S l is connected to the A-phase CT and receives the load side current detected from the A-phase CT. Here, the load side means a load end consuming the power supplied from the power supply end.

3S l is connected to the C-phase CT to receive the load-side current detected from the C-phase CT.

NS l is connected to the N-phase CT to receive the load side current detected from the N-phase CT.

1S l , 3S l , and NS l are connected to each other by the 2S l terminal in the terminal block for protection of the instrument transformer. This internal wiring is for indirectly calculating the B-phase current according to Equation (1) established in accordance with Kirchhoff's law of a three-phase four-wire system power line.

[Equation 1]

Ib = - (Ia + Ic + In)

Here, Ia is the A-phase current, Ib is the B-phase current, Ic is the C-phase current, and In is the N-phase current. Also, a symbol such as - indicates the direction of the current.

Therefore, the currents of phase B can be calculated by interconnecting 1S 1 , 3S 1 , and NS 1 internally and summing the currents of A phase, C phase, and N phase.

P2 is connected to the B-phase PT and receives the detected voltage from the B-phase PT.

3S k is connected to the C-phase CT to receive the power-source current detected from the C-phase CT.

P3 is connected to the C phase PT and receives the detected voltage from the C phase PT.

P0 is connected to ground.

NS k is connected to the ground of the N-phase CT.

P0 and NS k are terminals connected to the ground, and can be interconnected inside the terminal block for protecting the transformer for the instrument.

The output terminals 150 are arranged in the order of 1S, P1, 2S, P2, 3S, P3, P0, 3L, 2L,

1S is connected to the input terminal of the k 1S 110, receives the power source side from A phase current detection CT.

2S is connected to 2S 1 of the input terminal unit 110 and receives the B-phase current indirectly calculated by the A-phase, C-phase, and N-phase.

3S 3S k is connected to the input terminal 110, is input to the power supply side current detected from the C-phase CT.

P0, 3L, 2L, and 1L may be by being connected to the P0 and NS k of the input terminal portion 110, the ground.

In the embodiment of the present invention, the A-phase CT and the C-phase CT are the CTs respectively included in the two transformers. The N-phase CT is additionally an N-phase CT.

FIG. 3 is a view illustrating an example of a protective system according to an embodiment of the present invention.

3, the protective circuit 130 includes a current input unit 131, an analog-to-digital conversion unit 132, a signal generation unit 133, a signal execution unit 134, and an open signal input unit 135 .

The current input section 131 receives the current output from the input terminal section 110. The current input unit 131 detects a current flowing in an extension line connecting the input terminal unit 110 and the output terminal unit 150. The current input unit 131 detects the current flowing in the extension lines corresponding to the A-phase, B-phase and C-phase using the current detection sensor. Here, the current detection sensor may be a current detection sensor in the form of an annulus or a clamp. The current input section 131 transmits the current of the extension corresponding to each detected phase to the analog-to-digital conversion section 132.

The analog-to-digital converter 132 converts the current of the extension corresponding to each phase into a digital signal. The analog-to-digital converter 132 transmits the current value converted into the digital signal to the signal generator 133.

The signal generating unit 133 generates a short-circuit signal for short-circuiting an extension corresponding to the A-phase, the B-phase, and the C-phase. The signal generating unit 133 also generates an open signal for opening all of the extensions corresponding to the A-phase, the B-phase, and the C-phase.

The signal generation unit 133 compares the current value corresponding to each phase received from the analog-digital conversion unit 132 with a predetermined reference value. As a result of comparison, the signal generating unit 133 generates a short-circuit signal for short-circuiting an extension corresponding to an image on which a current value lower than a predetermined reference value is detected. For example, the signal generator 133 may generate a first short-circuit signal for short-circuiting an extension corresponding to the A-phase if the current value corresponding to the A-phase is less than a preset reference value. The signal generating unit 133 can generate a second short-circuit signal for short-circuiting an extension corresponding to the B-phase if the current value corresponding to the B-phase is less than a predetermined reference value. The signal generator 133 may generate a third short-circuit signal for short-circuiting an extension corresponding to the C-phase if the current value corresponding to the C-phase is less than a preset reference value.

Upon receiving the open input signal from the open signal input unit 135, the signal generating unit 133 generates an open signal. The open signal is a signal for opening the extension corresponding to the A-phase, B-phase and C-phase.

The signal generation unit 133 transmits the generated short-circuit signal or the open signal to the signal execution unit 134.

The signal performing unit 134 short-circuits or opens the extension corresponding to the A-phase, the B-phase, and the C-phase according to the received short-circuit signal or the open-signal.

For example, when the signal execution unit 134 receives the first short-circuit signal, the signal execution unit 134 short-circuits the corresponding station on the A-phase. Upon receiving the second short-circuit signal, the signal performing unit 134 short-circuits the station B corresponding to the second short-circuit signal. Upon receiving the third short-circuit signal, the signal-performing unit 134 performs a short-circuit of the station C corresponding to the third short-circuit signal. Further, when receiving the open signal, the signal performing unit 134 performs the opening of the extensions corresponding to the A-phase, B-phase and C-phase.

The open signal input unit 135 receives an open input signal that is a signal for opening the A-phase, B-phase, and C-phase from the outside. For example, the open signal input 135 may be configured as a device such as a button.

4 is an exemplary view showing the inside of a terminal block for protecting a transformer for a meter according to an embodiment of the present invention.

4, the terminal block 100 for protecting a transformer for a meter includes an input terminal portion 10, an output terminal portion 50, and a protection transformer portion 130.

The input terminal unit 10 receives the voltage and current of the power line from the power measuring device mounted on the power line. For example, the terminals are arranged in the order of P1, 1S, 1L, P2, 2S, 2L, P3, 3S, 3L,

Here, P1 of the input terminal unit 10 is connected to PT of the A phase to receive the voltage detected from the A phase PT.

1S is connected to the CT of the A phase, and receives the power-side current detected from the CT phase of the A phase.

1L is connected to CT of A phase and receives load side current detected from A phase CT.

P2 is connected to PT of B phase and receives the voltage detected from B phase PT.

2S is connected to the CT of the B-phase and receives the power-source current detected from the CTC of the B-phase.

2L is connected to the CT of the B phase and receives the load side current detected from the B phase CT.

P3 is connected to the PT on the C phase and receives the voltage detected from the C phase PT.

3S is connected to the C-phase CT and receives the power-source current detected from the C-phase CT.

3L is connected to the C-phase CT and receives the load-side current detected from the C-phase CT.

P0 is connected to ground.

The output terminal unit 50 outputs the current and voltage received from the input terminal unit 10 to a watt-hour meter for measuring the power amount of the power line. The terminals of the output terminal unit 50 may be arranged in the same order as the input terminal unit 10. For example, the output terminal portion 50 may be arranged in the order of P1, 1S, 1L, P2, 2S, 2L, P3, 3S, 3L, At this time, the output terminal unit 50 and the input terminal unit 10 may be connected to each other by the same name. At this time, 1L, 2L and 3L can be connected to P0 by an extension. That is, 1L, 2L and 3L can be grounded by P0.

The protective relay 130 short-circuits or opens the first station 31, the second station 32 and the third station 33 using the currents of the A phase, B phase, and C phase.

The protection controller 130 determines that the watt hour meter is detached from the terminal unit 100 for protection of the instrument transformer protecting unit when the currents of the A phase, B phase, and C phase inputted thereto are respectively less than the predetermined reference values. The protection controller 130 controls the short-circuiting element to short-circuit the extensions of the first to third extensions 31 to 33 that are determined to be in an open state. Here, the short-circuiting element may be a switch element such as a relay (relay) or an SSR (solid-state relay), for example.

That is, if the A-phase current is less than a preset reference value, the protective relay 130 short-circuits the first station 31 by connecting the first station 31 to the ground using the first short-circuit element 41. The protective relay 130 short-circuits the second extension 32 by grounding the second extension 32 using the second short-circuit element 42 if the B-phase current is less than a preset reference value. The protective relay 130 short-circuits the third extension 33 by grounding the third extension 33 using the third short-circuit element 43 if the C-phase current is less than a preset reference value.

When the open state such as the replacement work of the watt hour meter is completed, the protection module 130 can open the short-circuited first extension 31 to the third extension 33. [

In addition, the protective relay 130 can open the short-circuited first to third extensions 31 to 33 in addition to performing the control by the control.

The protection controller 130 can perform opening control by an external device for stable opening. That is, the protection module 130 receives an open input signal input by an input terminal attached to the case of the terminal block 100 for protecting the instrument transformer or an external input terminal connected to the transformer protecting terminal block 100 for the instrument. When the protective relay 130 receives the open input signal, the protective relay 130 can control the shorting element to open the first to third extensions 31 to 33.

5 is an exemplary view showing the inside of a terminal block for protecting a transformer for a meter according to another embodiment of the present invention.

5, the terminal block 100 for protecting a transformer for a meter includes an input terminal portion 110, an output terminal portion 150, and a protective totalizer portion 130.

Input terminal 110 are arranged in the order of 1S k, P1, 1S l, 3S l, NS l, P2, 3S k, P3, P0, NS k.

The output terminals 150 are arranged in the order of 1S, P1, 2S, P2, 3S, P3, P0, 3L, 2L,

The power source side current of the A phase input from the 1S k of the input terminal unit 110 is transmitted through the first station 181 to 1S. At this time, the power source side current of the A phase flowing through the first extension line 181 is detected by the first current detection sensor. The first current detecting sensor 171 transmits the detected power source side current of the A phase to the protective totalizer 130.

The load side currents of the A-phase, C-phase, and N-phase input through the terminals 1S 1 , 3S 1 and NS 1 of the input terminal unit 110 are summed by 2S 1 in the terminal unit 100 for protection of the instrument transformer. The load side currents of A, C, and N phases summed in 2S l are equal to the currents of B phase by Kirchhoff's law. In the embodiment of the present invention, the load side currents of A phase, C phase and N phase summed in 2S l will be described as B phase current.

The B-phase current of 2S l is transmitted to the 2S through the second extension 182. At this time, the B-phase current flowing through the second station 182 is detected by the second current detecting sensor. The second current detection sensor 172 transmits the detected B phase current to the protection module 130.

The current on the power supply side of C phase inputted from 3S k of the input terminal unit 110 is transmitted to the 3S via the third station 183. At this time, the current on the power supply side of the C phase flowing through the third station 183 is detected by the third current detecting sensor. The third current detection sensor 173 transmits the detected C-phase side current to the protection module 130.

The protective relay 130 short-circuits or opens the first station 181, the second station 182, and the third station 183 using the currents of the A-phase, B-phase, and C-

The protection controller 130 determines that the watt hour meter is detached from the terminal unit 100 for protection of the instrument transformer protecting unit when the currents of the A phase, B phase, and C phase inputted thereto are respectively less than the predetermined reference values. The protection controller 130 controls the shorting device to short-circuit the extensions of the first to third extensions 181 to 183 that are determined to be in the open state. Here, the short-circuiting element may be a switch element such as a relay (relay) or an SSR (solid-state relay), for example.

That is, when the A-phase current is less than a preset reference value, the protection relay 130 connects the first extension 181 and the ground line 184 using the first shorting element 191 to connect the first extension 181, Respectively. The protective relay 130 connects the second extension 182 and the ground line 184 by using the second shorting element 192 to short the second extension 182 when the B phase current is less than a predetermined reference value . The protective relay 130 connects the third extension 183 and the ground line 184 using the third shorting element 193 to the third extension 183 when the C phase current is less than a predetermined reference value, Respectively.

When the open state, such as the replacement of the watt hour meter, is completed, the protection module 130 can open the short-circuited first extension 181 to the third extension 183.

In addition, the protective relay 130 can open the short-circuited first extension 181 to the third extension 183 in addition to performing the open control.

The protection controller 130 can perform opening control by an external device for stable opening. That is, the protection module 130 receives an open input signal input by an input terminal attached to the case of the terminal block 100 for protecting the instrument transformer or an external input terminal connected to the transformer protecting terminal block 100 for the instrument. When the protective relay 130 receives the open input signal, it can control the shorting element to open the first extension 181 to the third extension 183.

6 is a diagram illustrating a method for measuring three-phase four-wire type power using two instrumentation transformers by applying a terminal block for protecting a transformer for an instrument according to an embodiment of the present invention.

6, the apparatus for measuring the amount of electric power includes two transformers 200, an N-phase current transformer 300, a terminal block 100 for protecting the transformer for a meter, and a watt-

The two transformers 200 are connected to a three-phase four-wire power line to measure the current and voltage on the A-phase to the N-phase. The CT (current transformer) included in the two transformers 200 is connected to the A network and the C phase to transfer the currents flowing on the A phase and the C phase to the terminal unit 100 for protecting the transformer for the instrument. The PTs (transformers) included in the two transformers 200 are connected to the A-phase to the C-phase to transfer the voltages on the A-phase to the C-phase to the transformer protection terminal block 100 for the instrument.

N-phase current transformer 300 is additionally provided on N of the power line. The N-phase current transformer 300 transmits the current of the N phase to the terminal transformer protection terminal 100 for the instrument.

The terminal block 100 for protecting a transformer for a meter according to an embodiment of the present invention transmits voltage and current received from two transformers 200 and an N-phase current transformer 300 to a watt- The instrument transformer protection terminal block 100 monitors the input current and can short-circuit or open terminals of the terminal block 100 for protecting the transformer protection terminal for the instrument according to circumstances. Also, the terminal block 100 for protecting a transformer for a meter according to an embodiment of the present invention easily receives terminals and voltages of a three-phase four-wire type power line using two transformers 200 and an N-phase current transformer 300 .

The watt hour meter 400 receives the voltage and current of the power line from the terminal block 100 for protecting the transformer for the instrument. The watt hour meter 400 can measure and record the total amount of power consumed by the load side from the input voltage and current.

In the embodiment of the present invention, the measurement of the power amount of the three-phase four-wire type power line using the two instrumentation transformers and the current transformer provided in the neutral line has been described as an example, but the present invention is not limited thereto. That is, a terminal block for protecting a transformer for an instrument according to an embodiment of the present invention can also be applied to a connection structure of a general three-phase four-wire power measurement system.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

100: terminal block for protecting the transformer for the instrument 10 110:
130: Protection circuit 131: Current input
132: analog-to-digital conversion unit 133:
134: Signal execution unit 135: Open signal input unit
50 150: Output terminal part 171 172 173: Current detection sensor
181 182 183: Extension 184: Ground wire
191 192 193: Shorting device 200: Instrument transformer
300: N phase current transformer 400: watt hour meter

Claims (10)

In a terminal block of a power measuring device for measuring the amount of electric power of a three-phase four-wire power line with a current transformer mounted on a two-phase and a neutral line,
Receives the input voltage and current of the power line from the power measurement device mounted to the power line, the 1S k, P1, 1S l, 3S l, NS l, P2, 3S k, P3, P0, the terminal in the order of NS k An input terminal portion to be disposed;
The current and the voltage input to the input terminal unit are output to a watt-hour meter for measuring the amount of power of the power line, and terminals are arranged in the order of 1S, P1, 2S, P2, 3S, P3, P0, 3L, 2L, An output terminal portion; And
And a protection system unit connected to an extension line to which the input terminal unit and the output terminal unit are connected to control a short circuit or an opening of a terminal to which the current is input.
The method according to claim 1,
Terminal of the l 1S, 3S, and NS l l wherein the input terminal is a terminal for transformer protection instrument, characterized in that connected in common to the internal transformer l 2S protective block for the instrument.
3. The method of claim 2,
1S, P1, 2S, P2, P3, and 3S of the output terminal is connected to the k 1S, P1, 2S l, P2, and P3 3S k of each input terminal,
Transformer protection terminal block gauge, characterized in that P0, 3L, 2L, and 1L is grounded to the common P0 and NS k and the output terminal of the input terminal.
The method according to claim 1,
Wherein the protective system comprises:
A current input unit receiving a current from an extension line to which the current is transmitted;
A signal generator for generating a short signal by comparing the magnitude of the input current with a preset reference value; And
And a signal performing unit for short-circuiting the extension according to a short-circuit signal received from the signal generating unit.
5. The method of claim 4,
Wherein the signal generator comprises:
Wherein when the magnitude of the current input from the current input unit is smaller than a preset reference value, a short circuit signal for the phase is generated.
5. The method of claim 4,
Receiving the input signal for opening the opening of the terminal block for transformer protection instrument further comprising a release signal input transmitting portion generates the signal.
The method according to claim 6,
The signal generator
And when the open input signal is received, generates an open signal and transmits the open signal to the signal performing unit.
8. The method of claim 7,
The signal-
And a terminal connected to an extension for transmitting the current is opened according to an open signal received from the signal generator.
5. The method of claim 4,
The protective system
Further comprising an analog-to-digital converter converting the magnitude of the current input from the current input unit to a digital signal and transmitting the magnitude of the current converted to the digital signal to the signal generator.
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KR1020100093465A 2010-09-27 2010-09-27 Terminal for metering out fit protection KR101144278B1 (en)

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KR1020100093465A KR101144278B1 (en) 2010-09-27 2010-09-27 Terminal for metering out fit protection
PCT/KR2011/007084 WO2012044031A2 (en) 2010-09-27 2011-09-27 Automatic ct-protecting control device for actively coping with human error in distribution system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100093465A KR101144278B1 (en) 2010-09-27 2010-09-27 Terminal for metering out fit protection

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KR102466120B1 (en) * 2020-11-24 2022-11-11 이레산업(주) Adaptor measuring current for voltage and current measuring apparatus of 3 phase

Citations (4)

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Publication number Priority date Publication date Assignee Title
KR200352036Y1 (en) 2004-03-09 2004-06-04 삼성계측제어(주) A circuit for sensing open state of the secondary terminal of a current transformer
KR20060016860A (en) * 2004-08-19 2006-02-23 삼성계측제어(주) An apparatus for sensing open state of the secondary terminal of a current transformer
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