KR920009852B1 - Automatic section switch - Google Patents

Abstract

The timer starts on a power failure of distribution line and when the power failure is not removed within a fixed time, the circuit breaker is operated to lock out the failure section so that expansion of instantaneous power failure to permanent power failure is prevented. The automatic section switch includes a pulse generator (15) for generating pulses according to power condition, a counter (16) for executing a first counting by the first pulse signal nd for executing a second counting by the second pulse, a time delaying circuit (17) for resetting the counter when input powre condition becomes normal after one pulse generation by the pulse generator, and a reset circuit (18) for preventing trip coil operation before the second counting is started.

Description

Failure Distribution Control Device for Digital Distribution Line

The accompanying drawings are circuit diagrams of an apparatus for controlling fault zones according to the present invention.

* Explanation of symbols for the main parts of the drawings

1: current transformer 2: switch

3: rectifier circuit 4: phase current generating circuit

6: control power supply and storage circuit 8: constant voltage circuit

9: Interoperability level comparison 10,28: Fault detection memory circuit

11: phase timing circuit 12,22,30: output circuit

13 trip coil drive circuit 14 signal current detection circuit

15: pulse generating circuit 16: counter circuit

17,24: time delay circuit 18: reset circuit

19: Lock operation level comparison 20: Lock detection memory circuit

21: Lock timing circuit 23: Set pulse circuit

25: Inrush current suppression circuit 26: Ground fault current generating circuit

27: Ground fault level comparison church 29: Ground fault timing circuit

TC: Trip coil

The present invention determines such a situation in the event of a fault current and a ground fault current exceeding an overload current at the rear end of a circuit breaker or circuit connector (recloser) of a multi-ground distribution line, i. The present invention relates to a fault distribution control device for a digital distribution line for improving reliability of supply power by separating an exaggerated section and eliminating a transient situation in cooperation.

Conventional switch (ASS: Automatic Section Switch) used as protection device in power distribution system is regarded as permanent failure even in temporary transient situation such as short circuit or lightning strike of line, and it is opened in a single time, so unnecessary power failure occurs frequently. Followed by the needlessness.

Accordingly, the present invention has been made to solve such a problem, and in case of transient transients not permanent failures, unnecessary power failures of consumers are provided by providing a chance to remove temporary transients by performing counting operation without directly opening at once. If the transient transient is not eliminated even after the repair operation is completed to the minimum, the fault distribution control device for the digital distribution line to effectively prevent the confusion of the distribution and the faucet management due to the power outage due to the power failure of unknown cause The purpose is to provide.

The present invention for achieving this object is installed in the rear end of the circuit breaker or recloser and the front end of the load, and the first functional unit for detecting the state of the phase current due to overload to open the trip coil only once, and ground fault In the normal distribution line fault section control device composed of a second function section and a distribution line current sensing function section for detecting a state caused by a current and opening a trip coil, when the input side is out of power when an overload is applied to the load. A pulse generation circuit for generating a pulse signal by operating by the output signal of the sensing function unit, and performing counting once by operating by the above pulse signal, and when the power failure of the input side is continued, Counter circuit for driving trip coil by counting times and when input side returns to normal after one pulse signal is generated Will by the by resetting the counter of circuit configuration to the reset circuit for stopping the operation of the trip coil until twice the counting by the counter circuit.

According to the present invention, when an overload occurs in the load itself, it is opened only once, and in case of a ground fault in the load itself, it is opened only once.

However, when the front end (input shaft) is out of power in an overload state, the shaft is not opened three times and the apparatus of the present invention performs only the counting operation. In other words, when the front end power is released and the normal current is input, it is reset after one counting and the trip coil does not operate. Therefore, the shaft is not opened and the fault current is continuously input even if the front end power failure or the power failure is resumed. It is characterized by the fact that it only opens after two counts.

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

FIG. 1 is a circuit diagram of an apparatus for controlling fault zones of a distribution type according to the present invention. When a three-phase voltage supplied from a circuit breaker (CB) or a recloser is input through the current transformer (1), and the switch (2) is turned on, Three-phase voltage is supplied to a load not shown. In addition, the current signal through the current transformer 1 is applied to the rectifier circuit 3 composed of a plurality of rectifier elements.

The signal rectified by the rectifier circuit 3 is charged to the capacitor 6B via the phase current generating circuit 4 and the resistor 6A constituting the control power supply and the capacitor 3 via the diode 5. Here, the zener diodes 6C and 6D and the transistor 6E are switching elements for controlling the current charged in the capacitor 6B constantly. In addition, the 110V or 220V AC power source selected by the power switch 7 is appropriately stepped down through the power transistor T, and then the bridge diode 8A, the constant voltage zener diode 8B, and the bias resistors 8C and 8D. ) And a resistor 6F configured inside the control power supply and the storage circuit 6 via the diode 8F after being applied to the constant voltage circuit 8 composed of the < RTI ID = 0.0 > and the power transistor 8E < / RTI > Is charged to the capacitor 6G, and is charged to the capacitor 6I through the diode 6H.

However, when the phase current flowing through the load (not shown) is equal to or greater than the open level current (overload protection range current), the voltage that is changed accordingly is sensed by the current transformer 1 and rectified through the rectifier circuit 3 to form a phase current generating circuit. It is applied across the resistor 4. The voltage applied to both ends of the resistor 4 is a bias voltage of a predetermined level is formed at both ends of the minimum phase pickup resistor (9B) via the resistor (9A) constituting the phase operating level comparison channel (9) Transistor 9C is turned on. When the transistor 9C is turned on, voltages generated by the resistors 9D and 9E are generated and applied to the non-inverting terminal of the comparator 9G through the resistor 9F. On the other hand, the reference voltage of the resistor 9H and the variable resistor 9I is applied to the inverting terminal of the comparator 9G. The comparator 9G compares these two input signals, causing a fault current to flow through the load. As the voltage across the resistor 9E exceeds the voltage by the variable resistor 9H for reference voltage setting, the comparator 9G outputs a high state signal.

The signal output from the comparator 9G is charged to the capacitor 10C through the resistor 10A and the diode 10B in the fault detection memory circuit 10. When the charging of the capacitor 10C is completed, the transistor 10E is turned on because a high bias voltage is applied to the base of the transistor 10E via the resistor 10D. When the transistor 10E is turned on, its collector terminal goes low. At this time, the voltage signal is applied to the base of the transistor 10G via the bias resistor 10F, but the transistor 10G is not turned on. When the transistor 10G is turned off, its collector terminal goes high.

Meanwhile, the phase timing circuit 11 operates as an overload occurs. That is, since the bias voltage is applied to the base of the transistor 11C via the diode 11A and the capacitor 11B, the transistor 11C is turned on. When the transistor 11C is turned on, the capacitor 11F performs the charging operation through the diode 11D and the resistor 11E. When the current applied to the load increases sharply, the voltage charged in the capacitor 11F is also increased. It will increase rapidly.

When the charging of the capacitor 11F is completed, a high voltage signal voltage is applied to the non-inverting input terminal of the comparator 12A constituting the output circuit 12 through the resistor 11G. At this time, the comparator 12A compares the reference voltages of the resistors 12B and 12C connected to the inverting input terminals thereof with the voltage signals input from the phase timing circuit 11, so that when the overload occurs, the input voltage becomes higher than the reference voltage. 12A outputs a high state signal. The high state signal output from the comparator 12A is input to the trip coil driving circuit 13 through the resistor 12D and the diode 12E.

The trip coil driving circuit 13 drives the trip coil TC by the signal applied from the output circuit 12. First, the signal of the high state applied through the diode 13A is output from the output circuit 12. The transistor 13B is turned on. When the transistor 13B is turned on, its collector terminal is turned low, so that it is also turned to the bias resistor 13C, whereby the transistor 13D is turned off. When the transistor 13D is turned off, since the transistor 13F is turned on via the coupling capacitor 13E, the relay contact TR is turned on because current is induced in the trip coil driving relay coil TR. Therefore, since the electromagnetic force generated by the current flowing through the trip coil TC is generated and the switch 2 in the on state is automatically turned off, the voltage supplied to the load is cut off, thereby effectively preventing the load from overcurrent.

On the other hand, a case where a fault current occurs in the line and the circuit breaker or circuit connector (not shown) at the front end of the current transformer 1 cuts the fault current first will be described.

When the front end is out of power, a delay output is generated from the capacitor 10C in the fault detection memory circuit 10, and accordingly, the transistor 10E remains turned on for a slight delay time so that the anode terminal of the diode 10H Remains low. This low state signal cannot pass through the diode 10I.

On the other hand, as the front end is interrupted, the transistor 14A configured in the line current sensing circuit 14 is kept in a turn-off state, and its collector terminal becomes high. At the same time, when the above-described delay time of the capacitor 10C has passed, the transistor 15B is via the bias resistor 15A configured inside the pulse generation circuit 15 via the diode 10I and the coupling capacitor 14B. The instantaneous high voltage signal is applied to the base of the circuit. At this time, since the transistor 15B is turned on, a current flows in the relay coil RS, and accordingly, the relay contact RS ₁ in the counter circuit 16 is turned on and off momentarily.

)이 동작하게 되어 셋트됨으로써 1카운트를 하게 된다. 셋트 릴레이코일(

)이 셋트될경우 릴레이접점(LR_1a)은 온되고 릴레이접점(LR_1b)은 오프되는바, 이때 릴레이코일(RY₁)은 동작하지 않게되어 릴레이접점(RY₁)은 오프되므로 트랜지스터(16D)가 턴오프되지만 셋트릴레이코일(

)은 셋트된 상태를 계속 유지한다.As soon as the relay contact RS ₁ is turned on, a current flows in the relay coil RY ₁ , and the relay contact RY ₁ is turned on. When the relay contact RY ₁ is turned on, the transistor 16D is turned on because a high bias voltage is applied to the resistor 16C via the resistor 16A and the capacitor 16B. As the transistor 16D is turned on, the set relay coil (

) Is set to 1 count. Set relay coil

Is set, the relay contact LR _1a is turned on and the relay contact LR _1b is turned off. At this time, the relay coil RY ₁ is not operated and the relay contact RY ₁ is turned off. Is turned off but the set relay coil (

) Stays set.

In this case, the trip coil TC does not operate. That is, since the transistor 10E in the fault detection memory circuit 10 is turned off and its output terminal (collector terminal) remains high, the transistor 10G is turned on and the capacitor in the phase timing circuit 11 is turned on. The current charged in the 11F and 11H is grounded by the transistor 10G through the diodes 11I and 11J and the resistor 11K. At this time, since the voltage applied to the non-inverting input terminal of the comparator 12A constituting the output circuit 12 becomes smaller than the reference voltage, the comparator 12A maintains a low state signal. Accordingly, since the transistor 13B in the trip coil driving circuit 13 is not operated, the transistor 13D is turned on, and accordingly, a low state signal is applied to the base of the transistor 13F, so that the transistor 13F is turned off. do. When the transistor 13F is turned off, the trip coil driving relay coil TR does not operate and the relay contact TR maintains an off state, so that the trip coil TC does not operate, so the switch 2 is in an on state. Keep going.

However, when a momentary power failure is released and a normal current is applied, the transistor 9C in the phase operating level comparison channel 9 is turned off, and accordingly, the output of the comparator 9G is kept low so that the transistor ( 10E) is turned off. As transistor 10E is off, transistor 10G is turned on. In addition, when it returns to normal, the transistor 11C is also turned off, and the charging operation of the capacitor 11F is stopped.

)에는 전류가 흐르게 되어 릴레이접점(LR_1a)은 오픈되고, 릴레이접점(LR_1b)은 온되어 리셋트되어 처음의 정상상태로 복귀된다.On the other hand, in this case, since the transistor 14A in the line current sensing circuit 14 is turned on, the collector terminal of the transistor 14A goes low, and the diode 17A and the resistor 17B configured in the time delay circuit 17 are turned off. The signal of the low state is also applied to the base of the transistor 17C via the collector terminal of the transistor 17C, so that the capacitor 17D is charged and the capacitor 17D is charged and at the same time the comparator 18A in the reset circuit 18 The non-inverting terminal is applied with a high state signal passing through the resistors 18C and 18D by turning off the transistor 18B. At this time, the comparator 18A compares the reference voltage set by the resistors 12B and 12C with the input voltage. In this case, since the input voltage exceeds the reference voltage, the comparator 18A outputs a high state signal. . The high state signal output from the comparator 18A turns on the transistor 18G via the bias resistors 18E and 18F. As the transistor 18G is turned on, a reset relay coil (

), Current flows to the relay contact LR _1a , and the relay contact LR _1b is turned on and reset to return to the initial normal state.

)이 셋트된 상태에서 정전후 입력되는 전류가 고장전류일 경우에는 전술한 바와같이, 셋트릴레이코일(

)이 셋트되어 1카운팅을 수행하며, 릴레이접점(LR_1a)가 온상태를 유지하여 릴레이코일(RY₂)이 동작될 준비를 하게 된다. 이때 트랜지스터(10G)의 출력은 하이상태가 되고, 선로전류감지회로(14)내의 트랜지스터(14A)의 출력은 로우상태가 되므로 콘덴서(14B)를 통해 펄스발생회로(15)내의 트랜지스터(15B)의 베이스에는 순간적인 하이상태의 펄스가 입력된다. 따라서 릴레이코일(RS)이 한번더 동작하게 되는바, 이때에는 카운터회로(16)내에 구성된 릴레이접점(RS₂)이 순간적으로 온된뒤 오프되고, 릴레이접점(LR_1a)은 셋트릴레이코일(

)이 셋팅된 상태에서는 온되어 있으므로 릴레이코일(RY₂)이 동작한다.However, if the current inputted after a power failure at the front end keeps the fault current, that is, the set relay coil (

), When the current input after the power failure is a fault current, as described above, the set relay coil (

) Is set to perform 1 counting, and the relay contact LR _1a remains on to prepare the relay coil RY ₂ to operate. At this time, the output of the transistor 10G is in a high state, and the output of the transistor 14A in the line current sensing circuit 14 is in a low state, so that the transistor 15B of the transistor 15B in the pulse generating circuit 15 is passed through the capacitor 14B. The instantaneous high state pulse is input to the base. Therefore, the relay coil RS is operated once more. In this case, the relay contact RS ₂ configured in the counter circuit 16 is turned on and off momentarily, and the relay contact LR _1a is set to the set relay coil (

) Is set to ON, so the relay coil (RY ₂ ) operates.

When the relay coil RY ₂ is activated, the relay contact RY ₂ is turned on, and accordingly, a bias of a high state is applied to the base of the transistor 16G through the capacitor 16E and the resistor 16F so that the transistor 16G is applied. Is turned on. When the transistor 16G is turned on, the relay coil RR ₂ is operated so that the relay contact RR ₂ in the trip coil drive circuit 13 is turned on. In this case, since the relay contact LR _{1a in the} trip coil drive circuit 13 is already in the ON state, the transistor 13D is turned off, and accordingly the transistor 13F is turned on via the capacitor 13E. The trip coil driving relay coil TR is activated and the relay contact TR is turned on. When the relay contact TR is turned on, the trip coil TC is operated to protect the load from the fault current by turning off the switch 2.

The counter switch (CNT) shown in the trip coil drive circuit 13 is automatically opened after one or two counting when a fault current occurs. When the counter switch (CNT) is to be opened only once, the counter switch (CNT) is turned on. If it is to be opened only two times, it must be turned off as shown in FIG.

The test button TB is used to open the switch 2 arbitrarily. When the user presses the test button TB to turn off the device arbitrarily, the test button TB is tripped regardless of the relay contact TR. A current flows in the coil TC so that the switch 2 can be automatically turned off.

On the other hand, when a fault current equal to or greater than the rated breaking current (for example, a current of 800 A or more) is input, the transistor 19A configured in the lock operating level comparison channel 19 operates to operate the comparator 19D via the resistors 19B and 19C. The non-inverting terminal of is applied with a voltage equal to or higher than the reference voltage applied to its inverting terminal. At this time, the comparator 19D generates a high state signal to charge a current in the capacitor 20C via the resistor 20A and the diode 20B in the lock detection memory circuit 20.

When the charging of the capacitor 20C is completed, since the bias voltage is applied to the base of the transistor 20D through the resistor 20D, the transistor 20D operates. At this time, since the output thereof becomes a low state, the transistor 20F cannot be turned on due to the voltage applied to the resistor 20E, so that the resistor 21B and the capacitor 21A in the second timing (lock timing) circuit 21 are connected. The current is charged for a time by the time constant of.

When the charging of the capacitor 21A is completed, a voltage exceeding the reference voltage applied to the inverting terminal thereof is applied to the non-inverting terminal of the comparator 21D through the resistor 21B and the resistor 21C, so that the comparator 21D Generates a high state signal and charges the capacitor 22C via the resistor 22A and the diode 22B in the output memory circuit 22 to store the lock output.

However, even when the output of the comparator 21D is high, the trip coil TC is not operated. This is because a high state signal is applied to the collector terminal of the transistor 14C in the line current sensing circuit 14 through the resistor 22D and the diodes 22E and 22F after the charging of the capacitor 22C is completed. This is because the transistor 14C is turned on after filling the 20C and the transistor 14D is turned on so that the high state signal generated by the output memory circuit 22 is grounded.

However, when the diagnosis is interrupted while operating in such a state, the transistors 14C and 14D in the line current sensing circuit 14 are turned off. The high state signal generated by the comparator 21D turns on the transistor 13B in the trip coil drive circuit 13 via the diode 22E. When the transistor 13B is turned on, the transistor 13D is turned off, whereas the bias state of the high state via the resistor 13G and the capacitor 13E is applied to the base of the transistor 13F, so that the transistor 13F is turned on. Is turned on, and thus the trip coil driving relay coil TR is operated to turn on the relay contact TR. Therefore, since the current flows through the trip coil TC, the switch 2 can be opened three times in a single time.

)이 셋트되어 상동작레벨비교회로(9)내의 릴레이접점(LR_3a)은 온되고, 시간지연회로(24)내의 릴레이접점(LR_3b)은 오프되어 돌입전류에 대비하게 된다.On the other hand, when a power failure occurs while the input current is normal, a low state signal is applied to the base of the transistor 14E in the line current sensing circuit 14, so that the transistor 14E is turned off. As the transistor 14E is turned off, a high state signal is applied to the base of the transistor 23A in the set pulse circuit 23 via the resistor 23B, the capacitor 23C, and the bias resistor 23D. 23A) is turned on. When the transistor 23A is turned on, the set relay coil (

) Is set so that the relay contact LR _3a in the phase operation level comparison circuit 9 is turned on, and the relay contact LR _{3b in the} time delay circuit 24 is turned off to prepare for inrush current.

)이 동작하여 리셋트되므로 그의 접점(LR_3b)은 온되고, 접점(LR_3a)은 오프된다.In addition, when the switch 2 is turned on in the normal current state, the transistor 14A in the line current sensing circuit 14 is turned on and at the same time, the transistor 24A in the time delay circuit 24 is turned off and thus the diode 24B. ), The anode is in a high state, so that the output of the comparator 25A in the inrush current suppression circuit 25 is in a high state, and bias voltages from the resistors 25B and 25C are applied to the transistor 25D so that the transistor 25C is applied. Turn on). When the transistor 25D is turned on, the reset relay coil (

) Is operated and reset, so that its contact LR _3b is on and the contact LR _3a is off.

)이 동작하여 그이 접점(LR_3a)이 온상태를 유지하므로 다이오드(9J)를 통과한 전류는 접점(LR_3a)을 통해 비교기(9G)의 입력단을 단락시키게 되므로 돌입전류에 대비하게 된다.As a result, when the device operates normally and suddenly the shear is corrected, the set relay coil (

) Operates so that the contact point LR _3a remains on, so that the current passing through the diode 9J shorts the input terminal of the comparator 9G through the contact point LR _3a , thereby preparing for inrush current.

When an abnormal state occurs in the load due to the ground fault, the current is sensed by the current transformer 1 and rectified by the rectifier circuit 3 to be generated in the resistor 26 constituting the ground fault current generating circuit.

At this time, the voltage applied to both ends of the resistor 26 is applied to both ends of the resistor 27A and the pickup resistor 27B constituting the ground fault level comparison circuit 27. At this time, the transistor 27C is turned on, a bias voltage is generated by the resistors 27D and 27E, and is applied to the non-inverting terminal of the comparator 2G through the resistor 27F.

On the other hand, a reference voltage by the resistor 9H and the variable resistor 9I is applied to the inverting terminal of the comparator 27G. The comparator 9G generates a high state signal in the event of a ground fault. The capacitor 28C is charged through the resistor 28A and the diode 28B. When charging of the capacitor 28C is completed, a high bias voltage is applied to the base of the transistor 28E via the resistor 28D, so that the transistor 28E is turned on.

Since the collector terminal thereof becomes low when the transistor 28E is turned on, this voltage is applied to the base of the transistor 28G via the bias resistor 28F, but the transistor 28G is not turned on. When the transistor 10G is turned off, its collector terminal goes high.

Then, as the ground current is generated, the ground timing circuit 29 operates, and since the bias voltage is applied to the base of the transistor 29C via the diode 29A and the capacitor 29B, the transistor 29C is turned on. do. When the transistor 29C is turned on, the capacitor 29F is charged through the diode 29D and the resistor 29E. When the excessive current flows due to the ground, the charging operation of the capacitor 29F is performed quickly. do.

When charging of the capacitor 29F is completed, a high signal is applied to the non-inverting terminal of the comparator 30A constituting the output circuit 30 via the resistor 29G. At this time, the comparator 30A outputs a signal in a high state compared with the reference voltages of the resistors 12B and 12C connected to its inverting input terminal, and outputs a trip coil driving circuit 13 through the resistor 30B and the diode 30C. Will be entered.

The high state signal generated by the output circuit 30 turns on the transistor 13B in the trip coil drive circuit 13, where the transistor 13D is turned off but the resistor 13G is provided at the base of the transistor 13F. The transistor 13F is turned on because a high state signal is applied via the capacitor 13E. When the transistor 13F is turned on, a current flows in the trip coil drive relay coil TR, and its relay contact TR is turned on, so that the switch 2 in the on state is automatically turned off to efficiently load the load from a ground fault. Will be protected.

On the other hand, when the recloser or the circuit breaker at the front end is momentarily turned off and grounded by a ground fault, a delay output is generated from the capacitor 28C in the fault detection memory circuit 28, so that the transistor 28E The anode terminal of diode 28H remains low because it remains turned on for a slight delay. This low state signal cannot pass through the diode 28I.

On the other hand, the transistor 14A in the line current sensing circuit 14 is turned off as the front end is interrupted by the ground fault, so that its output becomes high. At the same time, when the delay time of the capacitor 28C in the fault detection memory circuit 28 has elapsed, via the bias resistor 15A configured inside the pulse generation circuit 15 via the diode 28I and the capacitor 14B. The instantaneous high state voltage signal is applied to the base of the transistor 15B. In this case, since the transistor 15B is turned on to operate the relay coil RS, the relay contact RS ₁ inside the counter circuit 16 is turned on and off momentarily.

)이 동작하게 되어 셋팅됨으로써 1카운팅을 수행하게 된다.Accordingly, current flows through the relay coil RY ₁ , and the relay contact RY ₁ is turned on. As the relay contact RY ₁ is turned on, a bias voltage is applied to the base resistor 16C of the transistor 16D via the resistor 16A and the capacitor 16B to turn on the transistor 16D. When the transistor 16D is turned on, the set relay coil (

) Is set to perform 1 counting.

)이 셋트되면, 릴레이접점(LR_1a)은 온되고, 릴레이접점(LR_1b)은 오프되므로 릴레이코일(RY₁)은 동작을 하지 않게 되어 릴레이접점(RY₁)은 오프된다. 따라서, 트랜지스터(16D)가 턴오프되지만 셋트릴레이코일(

)은 셋트된 상태를 계속 유지하게 된다.Set relay coil

Is set, the relay contact LR _1a is turned on and the relay contact LR _1b is turned off, so that the relay coil RY ₁ does not operate and the relay contact RY ₁ is turned off. Thus, the transistor 16D is turned off but the set relay coil (

) Will remain set.

)이 셋트되더라도 트립코일(TC)은 작동하지 않게 된다. 왜냐하면, 고장검출기억회로(28)내의 트랜지스터(285)가 턴오프되고, 그의 출력이 하이상태를 유지하므로 트랜지스터(28G)가 턴온되며 지락타이밍회로(29)내에 있는 콘덴서(29F)(27H)에 충전된 전류는 다이오드(29I,29J)와, 저항(29K)을 통해 트랜지스터(28G)에 의해 접지되기 때문이다.Set relay coil

Trip coil (TC) does not work even if) is set. Because the transistor 285 in the fault detection memory circuit 28 is turned off and its output remains high, the transistor 28G is turned on to the capacitors 29F and 27H in the ground timing circuit 29. This is because the charged current is grounded by the transistor 28G through the diodes 29I and 29J and the resistor 29K.

In this case, since the output of the comparator 30A in the output circuit 30 is in a low state, the transistor 13B in the trip coil driving circuit 13 is not operated, so that the transistor 13D is turned on and accordingly the transistor 13F is turned off. A low state signal is applied to the base to turn off the transistor 13F.

When the transistor 13F is turned off, the trip coil driving relay coil TR does not operate, and the relay contact TR maintains an off state, so that the trip coil TC does not operate. It stays on.

)이 작동하는 상태에서 입력전류가 고장전류일 경우, 트랜지스터(28G)의 출력은 하이상태가 되고, 선로전류감지회로(14)내의 트랜지스터(14A)의 출력은 로우상태가 되므로 콘덴서(14B)를 통해 펄스발생회로(15)내의 트랜지스터(15B)의 베이스에는 순간적인 하이상태의 펄스가 입력된다. 따라서, 릴레이코일(RS)이 한번더 동작하게 되는바, 이때에는 카운터회로(16)내에 구성된 릴레이접점(RS₂)이 순간적으로 온된뒤 다시 오프되고, 릴레이접점(LR_1a)은 셋트릴레이코일(

)이 셋팅된 상태에서는 온되어 있으므로 릴레이코일(RY₂)이 동작하게 된다.However, when the current which was temporarily interrupted by the ground is not released and the fixed current is continued and the switch in the front is opened again, that is, the set relay coil (

When the input current is a fault current in the state where) is operated, the output of the transistor 28G becomes a high state, and the output of the transistor 14A in the line current sensing circuit 14 becomes a low state. The instantaneous high state pulse is input to the base of the transistor 15B in the pulse generation circuit 15 through this. Therefore, the relay coil RS is operated once more, in this case, the relay contact RS ₂ configured in the counter circuit 16 is temporarily turned on and then turned off again, and the relay contact LR _1a is set to the set relay coil (

) Is turned on in the set state, so the relay coil RY ₂ operates.

As the relay coil RY ₂ is operated, the relay contact RY ₂ is turned on, whereby a signal in a high state is applied to the base of the transistor 16G through the capacitor 16E and the resistor 16F, thereby providing a transistor 16G. Is turned on.

When the transistor 16G is turned on, the relay coil RR ₂ is activated so that the relay contact RR ₂ in the trip coil driving circuit 13 is turned on. At this time, since the relay contact LR _{1a in the} trip coil drive circuit 13 is already in the on state, the transistor 13D is turned off, and accordingly the transistor 13F is turned on via the capacitor 13E, thereby tripping. The coil drive relay coil TR is activated. Therefore, when the coil TR is operated, the relay contact TR is turned on so that the trip coil TC is operated to automatically switch off the switch 2 to protect the load from the fault current input after the ground fault.

However, when the momentary power failure state due to the ground fault at the front end is released and the line becomes normal, the transistor 27C in the ground fault level comparator 27 is turned off, so that the output of the comparator 27G is turned low. In this case, the transistor 28E is turned off. As the transistor 10E is turned off, the transistor 28G is turned on. In addition, upon returning to normal, the transistor 29C is also turned off, and the charging operation of the capacitor 29F is stopped.

On the other hand, in this case, since the transistor 14A in the line current sensing circuit 14 is turned on, the collector terminal of the transistor 14A goes low, and the diode 17A and the resistor 17B configured in the time delay circuit 17 Since the signal in the low state is applied to the base of the transistor 17C via the transistor 17C, the transistor 17C is not turned on.

Therefore, since the collector of the transistor 17C becomes high, the capacitor 17D is charged and at the same time, the non-inverting terminal of the comparator 18A in the reset circuit 18 is turned off by turning off the transistor 18D. 18C), a high state signal passing through 18D is applied.

At this time, the comparator 18A compares the reference voltage set by the resistors 12B and 12C with the input voltage. In this case, since the input voltage exceeds the reference voltage, the comparator 18A outputs a high state signal. do.

)에는 전류가 흐르게 되어 릴레이접점(LR_1a)은 오프되고, 릴레이접점(LR_1b)은 클로우즈되어 리셋트되므로 처음의 상태로 복귀되어 정상동작을 수행하게 된다.The high state signal output from the comparator 18A turns on the transistor 18G via the bias resistors 18E and 18F. As the transistor 18G is turned on, the set relay coil (

The current flows to the relay contact LR _1a is turned off, and the relay contact LR _1b is closed and reset to return to the initial state to perform the normal operation.

In the present invention operating as described above, when an overload is applied to the load itself, the timing of the apparatus of the present invention is completed first to perform an overload interruption operation, and the recloser is instantaneously operated once due to a failure of the recloser or circuit breaker on the power supply side. When cut off, the control device according to the present invention is not immediately opened, but only counting operation is performed so that the line is not permanently opened in only one instantaneous operation of the power supply side closer.

If the correction coefficient of the control device according to the present invention has two circuits, and the recloser of the power supply side is turned on again, the present invention can be cut off in cooperation with delay timing when the fault current is not extinguished, or twice in case of instantaneous timing. In order to confirm that it is permanently open and permanently broken, it is characterized by separating the track.

In addition, the device of the present invention locks the self-blocking operation once when a fault current equal to or greater than the rated breaking current occurs on the line, and when the power supply is a circuit breaker, a predetermined time lasts until the block is interrupted. It is the same as the conventional ASS, but when the power supply side is a recloser, it has an instantaneous characteristic operation that prevents the expansion due to the permanent failure by quickly blocking during arc time even in the case of a short circuit or lightning due to the nature of the recloser. In the situation, when the recloser makes a very fast instantaneous cutoff, the control device of the present invention is not opened in a single time, but only counting operation is performed to remove the transient transient state, and then, when the recloser is turned on, the normal power is returned to the load. It has the features to be supplied.

In addition, if the correction coefficient of the present invention is two times and the fault current is not consumed when the power supply side recloser is turned on again, then the recloser shuts down a second time and at the same time, the device also counts twice to open the shaft three times. It is characterized by identifying the situation and separating the track.

As a result, the control device according to the present invention can automatically reduce the unnecessary power failure of the customer by determining and confirming the over-line overload, transient failure and permanent failure by auto-cooperating itself regardless of the recloser or circuit breaker. Rather, it has the effect of contributing to improving the reliability of the distribution line.

Claims (1)

It is installed at the rear end of the circuit breaker or recloser and the front end of the load, and the phase current voltage generation circuit 4 which generates phase current when the load is overloaded, and the phase operation level circuit which operates when the phase current voltage is generated to generate a high signal. (9), a fault detection memory circuit 10 for detecting an abnormal state of phase current by a signal output from the phase operation level circuit 9, and an phase timing signal during operation of the fault detection memory circuit 10 described above. An overload detection section comprising a phase timing circuit 11 for generating a phase and a phase output circuit 12 for generating an output for operating the trip coil TC by operating by a signal output from the circuit 11; In ground fault current voltage generation circuit 26 which generates a ground fault current when a current is generated by ground fault, ground fault level circuit 27 which operates when a ground fault current voltage is generated, and a ground fault operation level circuit 27, The fault detection memory circuit 28 which detects an abnormal state of the ground current by the output signal, the ground fault circuit 29 which generates a ground fault signal during the operation of the fault detection memory circuit 28, and A ground fault detection unit comprising a ground fault output circuit 30 that operates by a signal output from the ground fault timing circuit to generate an output for operating the trip coil TC, and a line current detection unit 14 that detects current in the line. Wow ; An inrush current suppression circuit 25 and a lock operation level comparison circuit 19 for comparing the phase current voltage with a predetermined lock level voltage in order to delay the sensed line current so as to suppress the inrush current flowing in the line; A lock detection memory circuit 20 for operating a lock level signal to detect a lock state, a lock timing circuit 21 for generating a lock timing signal during operation of the lock detection memory circuit, and in the lock timing circuit In the distribution line failure section control apparatus comprised by the output circuit 22 for operating the trip coil TC by operating by the output signal; When the input side is out of power while the load is overloaded, the pulse generating circuit for generating pulses by operating by the output of the fault detection memory circuit 10 and the output signal of the line current sensing unit 14 is generated. (15) and; The operation is performed by the pulse signal generated by the pulse generation circuit, and counting is performed once. If the power failure of the input side is continued, the counting is performed twice by the pulse signal generated by the pulse generation circuit. A counter circuit 16 for driving; A time delay circuit (17) for resetting the operation of the counter circuit when the input side returns to normal after one pulse signal is generated in the pulse generation circuit (15); A reset circuit for stopping the driving of the trip coil TC by operating by the delay circuit 17 so as not to provide a signal to the trip coil driving circuit 13 before twice counting by the counter circuit 16 ( 18. A counting distribution line failure section control device, characterized in that consisting of 18).