JP3081494B2 - Automatic section switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic section switch which is used by being arranged at an arbitrary point in a distribution section of a time-sequential transmission line, and which is used when a ground fault occurs in the distribution section. In addition, the fault can be automatically detected, and based on the detection, the faulty power distribution section is automatically opened and cut off from the healthy section on the substation side to separate it.

[0002]

2. Description of the Related Art As shown in FIG.
Automatic switching switches B ₂ , B _3, ... Are arranged at the dividing points of a number of distribution sections A ₁ , A _2, ..., And when the circuit breaker CB of the substation is closed, the automatic switching switches B ₂ , B _3. ... are, automatic sectionalizing switch from automatic sectionalizing switches B ₁ substation side load side B
_2, B ₃ sequentially ..., are turned on with a turned time difference is predetermined, it is to be successively transmitted from the power distribution leg A ₁ substation side to the final distribution leg A _n.

[0003] In such a time-sequential progressive distribution line 1, a ground fault due to poor insulation of a transformer, a ground fault due to poor insulation of an insulator of a column supporting a high-voltage distribution line, a strong wind or a bird. Various types of ground faults such as ground faults caused by such contact may occur. In addition, a short circuit failure may occur due to poor insulation of the cable itself. In recent years, of these faults, short-circuit faults have become very small with the improvement of cable quality, only 10-20%, and the remaining 8
0 to 90% are ground faults.

[0004]

[Normal power transmission] In the timed progressive transmission line shown in FIG. 6, power is transmitted from the substation to the high-voltage distribution line as follows. (1) CB feeder F1 substations (breaker) is transmitting to closed in distribution leg A _1, automatic sectionalizing switch B ₁ and B
Voltage is applied to ₅ . (2) automatic sectionalizing switches B ₁ represents thrown after on time which has been predetermined (e.g., 7 seconds), is power transmission to the power distribution segment A _2. (3) below, the distribution leg A ₂ after the automatic section switch B _2,
B ₃ ... Are sequentially input with the time lag described above, and 49
Is the transmission to the final distribution leg A ₈ after seconds.

[0005] In the time-sequential transmission type distribution line 1 shown in FIG.
_1, when a short circuit or ground fault in any of the A ₂ ··· has occurred and has been processed following as. (1) For example, when a short circuit or ground fault at distribution leg A ₃ occurs, the circuit breaker CB in the substation is interrupted. Normally, the circuit breaker CB is set to be closed twice after the interruption and to close the distribution line each time. In this case, the first cycle is called a re-close cycle, and the second cycle is called a re-close cycle. (2) When the circuit breaker the circuit breaker CB when re transmission to reclosing to distribution line after interruption of CB re outage shut off again, the distribution leg A ₃ is detected as shorted or ground fault section You. At this time, the automatic sectionalizing switch B ₂ is locked in the disconnected state (followed to be closed again is held in a state that is not power to the load side), the circuit breaker CB from being subsequently re-re-closure substation be transmission to the distribution leg a ₂ automatic sectionalizing switch B ₂ is not turned on, (distribution leg a ₃ in FIG. 5) fault section is disconnected therefrom than the substation side healthy section. In this case, split off the distribution leg A ₃ and subsequent distribution leg is a power failure, but from healthy substations side power distribution segment A _1, A ₂ is not a power outage. (3) If a ground fault is not detected within a predetermined detection time at the time of the reclosing, the automatic segment switch B ₂
Return to the normal state, the lock is released, and after the re-closed circuit, the power is sequentially turned on to the automatic sorting switches B ₃ , B ₄ .

[0006]

The above-mentioned accident handling method has the following problems. (1) If a short circuit or a ground fault occurs in any of the distribution sections A ₁ , A _2, ..., The circuit breaker CB of the substation is cut off. In addition, a power failure occurs in a healthy section where no ground fault occurs. In addition, since the power failure occurs even when the ground fault section is separated from the healthy section, if a ground fault occurs, the power is cut off at least twice before the power can be transmitted to the healthy section. (2) As the number of power distribution sections increases, it takes time to detect a faulty section, and the power outage time from power outage to recovery becomes longer.

(3) In order to prevent a power failure in a healthy section, an automatic section switch after a faulty distribution section may be disconnected before the circuit breaker CB of the substation is disconnected. When a short-circuit fault occurs in the progressive distribution line 1, a large current exceeding the breaking capacity flows through the automatic segment switch, and if the automatic segment switch breaks, an explosion may occur.
For this reason, conventionally, it has not been possible to shut off the automatic switchgear arranged on the distribution line prior to the breaker CB of the substation both at the time of the short-circuit fault and the ground fault.

[0008] An object of the present invention is that when a short-circuit fault occurs in a distribution section, the circuit breaker of the substation is cut off first as before,
If a ground fault occurs in the distribution section after the junction point where the automatic section switch of the present invention is installed, the automatic section switch of the present invention detects the ground fault itself, and is higher than the breaker of the substation. First cut off, automatically reclose the distribution line and re-close as necessary to isolate and isolate the faulty section, the substation is uninterrupted, and the distribution with the automatic switchgear of the present invention installed It is an object of the present invention to reduce the power outage section, shorten the power outage time, and reduce the number of power outages by preventing the power outage only in the section and subsequent sections and avoiding any power outage in the healthy section on the substation side from the power distribution section.

[0009]

The automatic section switch according to the first aspect of the present invention is, for example, as shown in FIG. 1, and has a detection function for detecting a ground fault and a time-sequential feeder. distribution leg a _1, a ₂ any of the distribution leg a ₁ in ... of,
An open shut-off function to open blocked earlier than breaker substation when the ground fault of the A ₂ · · ·, automatically on again after opening blocked, if necessary by re-re-on disconnecting the ground fault section comprising a disconnection function, distribution leg a _1, a ₂ distribution leg a ₁ is installed at an arbitrary division point of ..., a ₂ automatic sectionalizing switches for opening and closing a ... are the following (1) to (6 ). (1) Distribution sections A ₁ , A ₂ ... of timed progressive transmission line 1
A zero-phase current transformer ZCT and a zero-phase transformer ZPD for detecting a ground fault occurring in the inverter. (2) A high-voltage switch S that opens and closes the substation side and the load side of the timed progressive transmission line 1. (3) A short-circuit protection relay having an open delay time in the event of a ground fault in any one of the distribution sections A ₁ , A _2, ... A fixed-type open delay circuit 3 that is set to be longer than the operation time. (4) The fixed open delay circuit (3) has a resistor (R)
The series circuit of the resistor (R) and the diode (D ₁ )
There is connected in parallel to the actuating electromagnet of the switch in the high pressure opening閉器(S) (M) (m ). (5) A ground fault relay E that operates upon receiving a zero-phase current and a zero-phase voltage from the zero-phase current transformer ZCT and the zero-phase transformer ZPD. (6) The first relay G which operates by the operation of the ground fault direction relay E to control the open / close of the high-voltage switch S, the subsequent re-input and re-input, the input time and the detection time after the input.
Automatic switching device H having a second relay F, a timer and a lock mechanism.

The automatic switchgear according to claim 2 of the present invention is, for example, as shown in FIG. 2 and has a detection function for detecting a ground fault and a distribution section A _{1 of} the timed progressive transmission line ₁ . A ₂
An open / close function that opens and shuts off earlier than a substation circuit breaker in the event of a ground fault in _one of the distribution sections A ₁ , A _2. Equipped with a disconnection function that re-inputs it again to separate the ground fault section,
Functions and equipment distribution leg A _1, A ₂ distribution leg A ₁ is installed at an arbitrary division point of ..., A ₂ automatic sectionalizing switches for opening and closing a ... are the following (1) to (5) It is provided with. (1) Distribution sections A ₁ , A ₂ ... of timed progressive transmission line 1
A zero-phase current transformer ZCT and a zero-phase transformer ZPD for detecting a ground fault occurring in the inverter. (2) A high-voltage switch S that opens and closes the substation side and the load side of the timed progressive transmission line 1. (3) A short-circuit protection relay having an open delay time in the event of a ground fault in any one of the distribution sections A ₁ , A _2, ... A variable open delay circuit 4 that is set longer than the operation time. (4) Zero-phase current transformer ZCT, ground-fault direction relay E that operates upon receiving zero-phase current and zero-phase voltage from zero-phase transformer ZPD. (5) The first relay G that operates by the operation of the ground fault direction relay E to control the open / close of the high-voltage switch S, the subsequent re-input and re-input, the input time and the detection time after the input.
Automatic switching device H having a second relay F, a timer and a lock mechanism. (6) The variable open delay circuit (4) is connected to a resistor (R ₁ ,
R ₂ ), its resistance (R ₁ , R ₂ ) and diode
A series circuit with (D ₁ ) is connected in parallel to the operating electromagnet (m) of the switch (M) in the high-voltage switch (S), and the resistor (R ₂ ) opens the first relay (G). contact (g ₂₎
Are connected in parallel and the resistor (R ₂ ) is short-circuited in normal times. When a ground fault occurs, the resistor (R ₂ ) is automatically inserted in series with the diode (D ₁ ) and the resistor (R ₁ ). When the open delay time is set to normal operation, it is longer than the operation time of the short-circuit protection relay of the sub time limit characteristic of the substation. It can be changed to be shorter.

An automatic sectional switch according to a third aspect of the present invention is, for example, as shown in FIG. 3, and has a detection function for detecting a ground fault and a distribution section A _{1 of} the timed progressive transmission line ₁ . A ₂
An open / close function that opens and shuts off earlier than a substation circuit breaker in the event of a ground fault in _one of the distribution sections A ₁ , A _2. Equipped with a disconnection function that re-inputs it again to separate the ground fault section,
Functions and equipment distribution leg A _1, A ₂ distribution leg A ₁ is installed at an arbitrary division point of ..., A ₂ automatic sectionalizing switches for opening and closing a ... are the following (1) to (5) It is provided with. (1) Distribution sections A ₁ , A ₂ ... of timed progressive transmission line 1
A zero-phase current transformer ZCT and a zero-phase transformer ZPD for detecting a ground fault occurring in the inverter. (2) A high-voltage switch S that opens and closes the substation side and the load side of the timed progressive transmission line 1. (3) A short-circuit protection relay having an open delay time in the event of a ground fault in any one of the distribution sections A ₁ , A _2, ... A variable open delay circuit 4 that is set longer than the operation time. (4) Zero-phase current transformer ZCT, ground-fault direction relay E that operates upon receiving zero-phase current and zero-phase voltage from zero-phase transformer ZPD. (5) The first relay G that operates by the operation of the ground fault direction relay E to control the open / close of the high-voltage switch S, the subsequent re-input and re-input, the input time and the detection time after the input.
Automatic switching device H having a second relay F, a timer and a lock mechanism. (6) The variable open delay circuit 4 divides the coil of the operating electromagnet m of the switch M of the high-voltage switch S into two or more coils (L ₁ , L ₂ ), and these coils (L ₁ , L ₂ )
₂₎ at normal time and a short circuit fault the open delay time are connected in series is longer than the operating time of the short-circuit protection relay of the substation, the coil (L ₁ divided during ground fault, L ₂₎ in parallel The connection delay time can be changed so as to be shorter than the operation time of the ground fault protection relay of the substation.

[0016]

The automatic segment switch according to the first aspect of the present invention includes the zero-phase current transformer ZCT and the zero-phase transformer ZPD for detecting a ground fault, so that the automatic segment switch of the present invention is provided. The ground fault occurring in the distribution section after the installation is reliably detected by the automatic switchgear itself. In the event of a ground fault, receiving a zero-phase current and a zero-phase voltage from the zero-phase current transformer ZCT and the zero-phase transformer ZPD, the ground fault direction relay E, the first relay G, the second relay F, and the automatic classification The switching device H is operated, and the switch M of the high-voltage switch S is opened and shut off. At this time, since the open delay time of the open delay circuit 3 is set shorter (for example, 0.6 seconds) than the operation time (for example, 0.8 seconds) of the ground fault protection relay of the substation, the breaker CB of the substation is set. The switch M always opens and shuts off before turning off. Thereafter, the switch M is re-input and re-input for the input time set by the timer of the automatic section switch H, the distribution line is reclosed and re-closed, and the automatic section switch H is locked by its lock mechanism. The ground fault section is isolated. For this reason, there is no power interruption in the substation, and only the power distribution section after the distribution section where the automatic switchgear of the present invention is installed is interrupted, and no power interruption occurs in the healthy section on the substation side from the distribution section. In addition, since the open delay time is set longer than the operation time of the short-circuit protection relay of the sub-time limit characteristic of the substation, when a short-circuit fault occurs in the distribution section, the short-circuit protection relay of the substation shuts off first and the automatic switchgear explodes. Not even.

[0017]

According to the second aspect of the present invention, the automatic sectional switch has the same function as the automatic sectional switch of the first aspect. Furthermore,
A series circuit of the switch resistance and the diode D ₁ to the operating electromagnet m of M R _1, R ₂ in the high pressure switch S as in Figure 2 connected in parallel, said first relay G to the resistance R ₂ since the opening contacts g ₂ are connected in parallel, the diode D ₁ and the straight
By arbitrarily selecting the time constants of the resistors R ₁ and R ₂ connected to the column , the open delay time can be set to an arbitrary time. Moreover, normal time is shorted the resistor R ₂ is, operation time (examples of short-circuit protection relay of inverse time characteristics of the open delay time set by the opening delay circuit 4 substation, 0.2
Sec) longer than (e.g., 1.0 seconds) becomes, the resistance R ₂ is the diode D ₁ at the time of ground fault, automatically inserted in series series resistance R ₁ + R ₂ next to the resistor R _1, the opening The open delay time set by the delay circuit 4 is automatically shorter than the operation time (for example, 0.8 seconds) of the ground fault protection relay of the substation (for example, the shortened open delay time of the high-voltage switch S is reduced to 0.
3 seconds + first relay G after ground fault direction relay E operates
(Operating time until the device operates): DGR operating time: for example, 0.3 seconds = 0.6 seconds). For this reason, if this automatic section switch is arranged in the distribution section of the time-sequential transmission line, in the event of a short-circuit fault, the high-voltage switch S of the automatic section switch is always opened after the breaker of the substation is shut off, There is no explosion of the automatic segment switch due to the large short circuit current flowing through the automatic segment switch. In addition, in the event of a ground fault, the high-voltage switch S of the automatic section switch is always opened and shut off before the circuit breaker CB of the substation is shut off. There will be no power outage only in the sections after the section, and there will be no power outage in healthy sections on the substation side from the distribution section.

[0018]

The automatic segment switch of the third embodiment operates in the same manner as the automatic segment switch of the first embodiment, and further comprises a variable open delay circuit 4 which is provided with a switch M in the high voltage switch S. Is divided into two or more, and the divided coils L ₁ and L ₂ are connected in series during normal times and in the event of a short-circuit failure, so that the impedance of the operating electromagnet m is L ₁ + L ₂
And the open delay time becomes longer than the operation time of the short-circuit protection relay at the substation.
When a ground fault occurs, the split coils L ₁ + L ₂ are connected in parallel, and the impedance of the working electromagnet m becomes (L ₁ × L ₂ ).
÷ (L ₁ + L ₂ ) (the impedance is reduced) so that the release delay time is shorter than the operation time of the ground fault protection relay at the substation.
_1, by arbitrarily selecting the number of turns of L _2, it is possible to determine the opening delay time at any time. For example, when the open delay time in normal times is 1.0 second, the open delay time at the time of a ground fault can be reduced to, for example, 0.6 seconds or less.

[0021]

Embodiment 1 FIG. 1 shows a first embodiment of an automatic segment switch according to the present invention. This automatic section switch comprises a high-pressure switch S and a control box T.

The high pressure switch ZCT detects a ground fault in the S ZCT, zero-phase transformer ZPD, switch M opening and closing the distribution line, the resistance R for opening delay circuit 3, a diode D ₁ is
Is provided. The open delay circuit 3 sets the open delay time of the automatic segment switch. The open delay time is a time from when a ground fault or a short-circuit fault is detected to when the switch M of the high-voltage switch S becomes a zero voltage and is opened and shut off.
Normally, the open delay time is 0.6 seconds for a ground fault and 0.6 seconds for a short circuit.

The control box T includes a zero-phase current transformer ZCT, a ground fault direction relay (DGR) E which operates upon receiving a zero-phase current and a zero-phase voltage from the zero-phase transformer ZPD, and the operation of a ground fault direction relay E. A first relay G that operates when the first relay G operates, a second relay F that opens when the first relay G operates, and an automatic section switching device H are provided. The automatic switchgear H comprises a relay device having a timer and a lock mechanism for setting a closing time of the switch M of the high-voltage switch S and a detection time for detecting a ground fault or a short circuit. Here, the charging time is 100 V AC in FIG.
After pressurizing the operation power supply, the time until the switch M is turned on and the distribution line on the substation side and the load side is connected, that is, the time until the automatic segment switch is put into the distribution line Good, usually set to 7 seconds. In the case of the automatic switchgear installed on the branch line of the distribution line as shown in FIG. 5, it is set to 7 ns. The detection time refers to a time for detecting a ground fault or a short circuit after the switch M is turned on, and is usually set to 6 seconds after the turn-on time (7 seconds).

In FIG. 1, e ₁ is an operating contact of the ground fault relay E, g ₂ is an open contact of the first relay G, f ₁ and f ₃ are operating contacts of the second relay F, and T is an operating power supply. It is a transformer.

The operation of the automatic segment switch shown in FIG. 1 is determined when the distribution section is normal (when there is no ground fault or short circuit fault), when a ground fault occurs, when the ground fault disappears, when a short circuit fault occurs, or when a ground fault or short circuit fault occurs. Each of the cases of simultaneous occurrence will be described.

[0026]

Normal operation of the automatic segment switch according to the first embodiment: Normal operation of the distribution line in FIG. 1 (when there is no ground fault or short circuit)
, When the operation power supply AC100V automatic section switch is applied, opening contacts g ₂ of the first relay G operates the second relay F for closing, the operation contact f _1, f ₃ of the relay F Close. Thereafter, the automatic switchgear H is activated → the operating contact f ₃ of the second relay F is closed, and the switch M is turned on by a timer of the automatic switchgear H (for example, 7).
After 2 seconds) → Automatic section switchgear H is mechanically locked (maintained so that power is not transmitted to the load side at the time of reclosing) → Ground fault is detected within the detection time (6 seconds) preset by the same timer → No ground fault is detected (no ground fault) → Automatic section switchgear H is unlocked (power is transmitted to the load side)
→ Normal (normal) operation.

In the circuit of FIG. 1, when the distribution line is normal (when there is no ground fault or short-circuit fault), as indicated by the arrow in FIG. 7, the rectifier Rec + side → contact f ₃ → operating electromagnet m + side →
A closed circuit of the same magnet side → rectifier Rec− side is configured,
Since the open delay circuit 3 does not enter the closed circuit, it is not affected by the open delay circuit 3.

[0028]

Operation at the time of a ground fault of the automatic segment switch of the first embodiment If a ground fault occurs in any distribution section on the load side of the high-voltage switch S in FIG. Sink ZC
T, detected by the zero-phase transformer ZPD, and the zero-phase current transformer ZC
T, the zero-phase current and the zero-phase voltage from the zero-phase transformer ZPD, the ground fault relay E operates, and thereafter, the operation contact e ₁
Closing → first relay G is operated, and a release contact g ₂ open →
The second relay F returns and its operating contacts f ₁ and f ₃ open →
The automatic section switching device H returns (stops operation). The opening of the operating contacts f ₁ and f ₃ interrupts the energization of the working electromagnet m, and at this time, a counter electromotive force flows from the working electromagnet m + side to the − side as shown in FIG. This back electromotive force is shown in FIG.
As shown by the arrow, the operating electromagnet m + side → diode D ₁ →
R flows from the resistance R to the working electromagnet m- side and gradually discharges,
The opening time of the switch M of the high-voltage switch S is delayed by extending the time until the operating electromagnet m is opened. For this reason, the switch M operates only for the time set by the open delay circuit 3 (normally, the open delay time (eg, 0.6 seconds) shorter than the operation time (eg, 0.8 seconds) of the ground fault protection relay of the substation). Open and shut off after a delay. For this reason, the circuit breaker (CB) of the substation is not interrupted, and no power failure occurs in the healthy section on the substation side from the distribution section in which the automatic switchgear of the present invention is installed.

[0029] connected to the diode D ₁ in series in FIG. 1
By arbitrarily selecting the time constant of the resistor R, the open delay time can be set to an arbitrary time shorter than the operation time of the ground fault protection relay of the substation. Incidentally, since the consumption of the back electromotive force is minimized, the delay time is the longest. Figure
Since 8 is diode D ₁ is in the energy generated by the counter electromotive force can not flow and the operating electromagnet m side + → resistor R → diode D ₁ → actuating electromagnet m- side.

When the switch M of the high-voltage switch S is turned off and no voltage is applied after the ground fault section, the ground fault current disappears, and thereafter, the ground fault direction relay E returns, and its operating contact e
₁ Open → First relay G returns, its open contact g ₂ Closed → The second relay F operates, its operating contacts f ₁ and f ₃ are closed → Automatic switchgear H is activated → Closed time (7 The switching line M of the high-voltage switch S after (sec) is closed (re-closed), the distribution line is reclosed → the automatic switching device H is mechanically locked → a ground fault current flows within the detection time → a ground fault direction relay E works,
The operating contact e ₁ closed → the first relay G operates, the open contact g ₂ opens → the second relay F returns, the operating contacts f ₁ and f ₃ open → the automatic switchgear H becomes non-voltage. It remains locked mechanically in the blocking state. As a result, the switch M of the high-voltage switch S is opened and shut off after the open delay time (for example, 0.6 seconds) → the fault section is separated. As a result, the circuit breaker (CB) of the substation is not interrupted, and the healthy section on the substation side from the distribution section where the automatic division switch of the present invention is installed is maintained in a state where no power failure occurs.

[0031]

If a short circuit fault in [short operation during a failure of the automatic sectionalizing switches of Example 1 power transmission occurs, the ground fault direction relay E in FIG. 1 dead, of the inverse time characteristic of the operation contact e ₁ open → substation The short-circuit protection relay operates → After the operation time (eg, 0.2 seconds), the circuit breaker (CB) of the substation shuts off → No voltage → Automatic switchgear H returns, and the operating contacts f ₁ and f ₃ open → Operating contacts f ₃ is open delay circuit 3 is actuated by the counter electromotive force during opening, the opening delay time (e.g., 0.6 seconds) of the delay circuit 3 switches M of the high-pressure switch S is open after re substation The short circuit fault section is separated by the closed circuit.

[0032]

[Automatic sectionalizing switches of the ground-short-circuit fault operation when concurrent Example 1] ground fault and short-circuit failure occurs to the ground-fault direction relay E is operating FIG simultaneously during power transmission, the operation contact e ₁
Closing → first relay G is operation, and its opening contacts g ₂ open. At the same time, the short-circuit protection relay of the sub-time limit characteristic of the substation operates → after the operation time (eg, 0.2 seconds), the circuit breaker (CB) of the substation shuts off → no voltage → ground fault direction relay E returns, its operation contact e ₁ open → first relay G is restored, the its opening contacts g ₂ closed. Also the by no-voltage → automatic sectionalizing switch device H is restored, the operation contact f _1, f ₃ open → open delay time (e.g., 0.6 seconds) switch M of the high-pressure switch S is open later, the substation The short-circuit and ground fault sections are separated by the re-closing of.

[0033]

Embodiment 2 FIG. 2 shows a second embodiment of the automatic segment switch according to the present invention. The configuration of this automatic segment switch is basically the same as the automatic segment switch of the first embodiment in FIG.
The difference is that the first relay G
The opening contacts with one more than the case of FIG. 1 g _2, g _4,
It was three g _6, also a series circuit of a diode D ₁ and a resistor R _1, R ₂ in operation electromagnet m in FIG. 2 are connected in parallel, the open contact g of the first relay G to the resistance R _{2 2} are connected in parallel, during normal is shorted the resistor R ₂ is, at the time of ground fault is that as the resistor R ₂ is inserted in series with the diode D _1, resistors R _1.

The operation of the automatic segment switch shown in FIG. 2 is performed when the distribution section is normal (when there is no ground fault or short-circuit fault), when a ground fault occurs, when the ground fault disappears, when a short-circuit fault occurs, and when a ground fault occurs simultaneously. Each of the times will be described.

[0035]

Normal operation of automatic switchgear of embodiment 2 Normal operation of distribution line in FIG. 2 (when neither ground fault nor short-circuit fault occurs)
, When the operation power supply AC100V is applied to the automatic section switch, the order release contact g ₆ of the first relay G is closed 2
Relay F operates, its operating contact f ₁ is closed. Thereafter, since the automatic sectionalizing switch device H is activated → release contact g ₄ of the first relay G is closed, as shown by the arrows in FIG. 9, the rectifier Rec + side → contact g ₄ → actuating electromagnets m + side → the electromagnet -
→ The rectifier Rec- side closed circuit is configured → The switch M of the high-voltage switch S is closed after the closing time → Automatic section switchgear H
Is mechanically locked → ground fault is detected within the detection time after closing → ground fault is not detected → automatic section switchgear H is unlocked → normal operation.

In the circuit of FIG. 2, when the distribution line is normal, FIG.
As shown by the arrow in FIG. 3, the open delay circuit 4 is not included in the closed circuit of the rectifier Rec + side → contact g ₄ → operating electromagnet m + side → the same electromagnet −side → rectifier Rec− side.
Is not affected.

[0037]

Operation of Grounding Fault of Automatic Segmented Switch of Embodiment 2 If a ground fault occurs on the load side section of the high-voltage switch of FIG. 2 during power transmission, the fault is detected by the zero-phase current transformer ZCT and the zero-phase Transformer ZPD
And a zero-phase current transformer ZCT and a zero-phase transformer ZPD
Zero-phase current from operates the ground direction relay E receives the zero-phase voltage, the operation contact e ₁ is closed. Thereafter, the first relay G operates, the open contacts g ₂ , g ₄ , g ₆ open → the second relay F returns, and the operating contact f ₁ opens → the automatic sorting switchgear H returns. This by opening the opening contacts g ₄ is de-energized the actuating electromagnet m, then the the operating electromagnet m + side as shown in FIG. 10 - counter electromotive force flows in the side is generated. At this time, it is open also open contact g _2,
The working electromagnet m and the diode D ₁ , the resistance R ₁ and the resistance R ₂ are in parallel, and the back electromotive force is as shown by an arrow in FIG. 10, the working electromagnet m + side → the diode D ₁ → the resistance R ₁ → the resistance R ₂ → the operation. It flows to the electromagnet m- side and gradually discharges. As a result, the time required for the operating electromagnet m to open becomes longer, and the opening time of the switch M of the high-voltage switch S is delayed. The switch M is delayed by a time set by the open delay circuit 4 (normally, an open delay time (eg, 0.6 seconds) shorter than an operation time (eg, 0.8 seconds) of a ground fault protection relay of a substation). To shut off. For this reason, the circuit breaker (CB) of the substation is not interrupted, and no power failure occurs in the healthy section on the substation side from the distribution section in which the automatic switchgear of the present invention is installed. Even in the circuit of FIG. 2, the resistances R ₁ and R ₂ are zero.
In this case, the consumption of the back electromotive force is minimized, so that the delay time is the longest. Because the FIG. 10 is a diode D _1, the energy generated by the counter electromotive force can not flow and the operating electromagnet m side + → resistor R → diode D ₁ → actuating electromagnet m- side.

When there is no voltage after the ground fault section due to the open / close of the switch M of the high-voltage switch S, the ground fault current disappears, the ground fault direction relay E is restored, and its operating contact e ₁
Is open → The first relay G returns, and its open contacts g ₂ , g
_4, g ₆ closed → second relay F operation, the operation contact f
₁ Closing → Automatic section switchgear H starts → Closing time (7 seconds)
Thereafter, the switch M of the high-voltage switch S is turned on (re-input) → the automatic section switch H is mechanically locked → a ground fault current flows within the detection time (6 seconds) → a ground fault direction relay E is activated. Operating contact e ₁ Closed → first relay G operates, open contact g
_2, g _4, g ₆ open → second relay F is restored, the operation contact f ₁ open → automatic sectionalizing switch device H will remain locked in mechanically blocking state becomes no voltage. At this time, since the open contacts g ₂ and g ₄ are open as described above, the switch M is opened after the open delay time (for example, 0.6 seconds) → the fault section is separated (does not restart). . That is, the circuit breaker (CB) of the substation is not interrupted, and a state where no power failure occurs in the healthy section on the substation side from the distribution section where the automatic division switch of the present invention is installed is maintained.

[0039]

[Operation during a short circuit failure of the automatic sectionalizing switches of Example 2] When the short circuit fault in one of the distribution leg during power transmission occurs, the ground fault direction relay E is inactive, the operation contact e ₁ open → substation Short-circuit protection relay operation with reverse time limit → operation time (eg
0.2 seconds) After that, the breaker (CB) of the substation is cut off → no voltage →
Automatic sectionalizing switch device H is restored, an operational contact f ₁ open,
Due to this opening, energization of the working electromagnet m is interrupted, and a back electromotive force is generated. At this time, since the release contact g ₂ is closed, actuating the electromagnet m and a diode D _1, resistors R ₁ becomes parallel (resistance R ₂ escapes) for back EMF is actuated as shown by arrows in FIG. 11 The electromagnet m + side → diode D ₁ → resistance R ₁ → open contact g ₂ → flow gradually to the working electromagnet m− side to discharge and prolong the time until the working electromagnet m is opened (delayed). For this reason, the switch M of the switch M of the high-voltage switch S is opened after the opening delay time (for example, 1.0 second) set by the opening delay circuit 4, and the short-circuit fault section is cut off by the reclosing of the substation. You. The opening delay circuit 4 resistor R ₂ the resistance is reduced because it is not included in the case, the delay time of the open delay circuit 4 is automatically slower than during ground fault to include resistor R _2.

[0040]

EXAMPLES operation in ground-short-circuit fault concurrent automatic sectionalizing switches of the 2] ground fault direction relay E operation of the ground fault and short-circuit fault occurs simultaneously in transmission 2, the operation contact e ₁ closed → The first relay G operates, and its open contacts g ₂ and g _{6 are} opened. At the same time the substation circuit protection relay operation → operating time (e.g., 0.2 seconds) breaker interrupting the substation after → no voltage → ground direction relay E returns, the operation contact e ₁ open → first relay G Return, the open contacts g ₂ and g _{6 are} closed. In addition, due to the no voltage, the automatic sorting switchgear H is restored,
Its operating contact f ₁ open → open delay time T (eg, 1.0
Seconds later, the switch M of the high-voltage switch S is opened, and the short circuit and the ground fault section are cut off by the reclosing of the substation.

[0041]

Third Embodiment FIG. 3 shows a third embodiment of the automatic segment switch according to the present invention. The configuration of this automatic segment switch is basically the same as the automatic segment switch of the first embodiment in FIG.
The difference is that the coil L of the working electromagnet m is divided into two as shown in FIG.
_1, the L ₂ open contact of the first relay G g ₂ and the operation contact g
_1, connects to g _3, normal time is closed the opening contacts g ₂ 2 two coils L _1, L ₂ are connected in series, opening contacts g ₂ is opened at the time of ground fault, operating contact g _1, g ₃ is closed so that the two coils L ₁ and L ₂ are in parallel so that the open delay time is shortened.

[0042]

Normal operation of automatic switchgear of Embodiment 3 Normal operation of distribution line in FIG. 3 (when neither ground fault nor short-circuit fault occurs)
, The release contact g ₆ of the operation power supply AC100V automatic section switch is applied first relay G operates the second relay F for closing, the operation contact f ₁ is closed. Thereafter, the automatic section switchgear H is activated → the rectifier Rec + side → the operating electromagnet m + side (coil L _{1) as} shown by the arrow in FIG.
Side) → open contact g ₂ → working electromagnet m- side (coil L ₂
Side) → Rectifier Rec- side closed circuit configuration → High-voltage switch S
Switch M is turned on after closing time → Automatic section switch H is mechanically locked → Ground fault is detected within detection time after closing → Ground fault is not detected → Lock of automatic section switch H is released → Normal operation.

[0043] In the circuit of Figure 3, during normal operation as shown by the arrows in FIG. 12, the rectifier Rec + side → actuating electromagnet m + side (coil L ₁ side) → opening contacts g ₂ → actuating electromagnets m- side (coil L ₂ ) → A closed circuit on the rectifier Rec- side is configured. That is, the coil L ₁ and L ₂ are connected in series. In this case, the impedance of the working electromagnet m is L ₁ + L ₂ .

[0044]

Operation of the automatic section switch of Embodiment 3 at the time of a ground fault fault If a ground fault occurs in the section on the load side of the high-voltage switch of FIG. 3 during power transmission, the fault is caused by the zero-phase current transformer ZCT and the zero-phase Transformer ZPD
And a zero-phase current transformer ZCT and a zero-phase transformer ZPD
Zero-phase current from operates ground direction relay receives the zero-phase voltage, the operation contact e ₁ is closed. Thereafter, the first relay G operates, the open contacts g ₂ and g ₆ open, and the operation contact g ₁
, G ₃ is closed → second relay F is restored, the operation contact f ₁ open → automatic sectionalizing switch device H is restored. At this time, opening contacts g ₂ is opened, since the operation contact g _1, g _3, such as closed, by opening the opening contacts g ₂ is cut off energization of the actuation electromagnets m, 2 two coils as shown in the time 13 Back electromotive force is generated in L ₁ and L ₂ . Gradually flows to the side - these, one coil L ₁ counter electromotive force of the energy generated in the FIG. 12 coil L as shown by the arrow in ₁ + side → rectifier Rec- side → rectifier Rec + side → coil L ₁ Discharges,
The energy of the back electromotive force generated in the other coil L ₂ is the coil L ₂ + side → the rectifier Rec− side → the rectifier Rec + side →
Since the discharge flows gradually from the open contact g _{1 to the} coil L ₁ − side and gradually discharges, the switch M of the high-voltage switch S has an open delay time shorter than the operation time of the substation ground fault protection relay (eg, 0.8 seconds) ( (E.g. 0.6 seconds). For this reason, the circuit breaker of the substation is not interrupted, and there is no power failure in the sound section on the substation side from the distribution section where the automatic division opening of the present invention is installed.

As described above, when a ground fault occurs, the two split coils L ₁ and L ₂ are connected in parallel as indicated by the arrow in FIG. 13, so that the impedance of the working electromagnet m in this case is (L ₁ × L ₂ ) ÷ (L ₁ + L ₂ ), which is smaller than in normal operation, and the open delay time is shorter.

As described above, when the ground fault section becomes zero voltage due to the open / close of the switch M of the high-voltage switch S, the ground fault current disappears. → The ground fault direction relay E returns, and its operating contact e ₁
Is open → The first relay G returns, and its operating contacts g ₁ and g
₃ Open circuit, open contacts g ₂ , g ₆ closed circuit → second relay F operates, its operating contact f ₁ closed circuit → automatic section switchgear H starts → switch M of high voltage switch S after closing time (7 seconds) put (Cycle) → automatic sectionalizing switch device H is mechanically locked → detection time (6 seconds) within the ground-fault current flows → ground direction relay E is operating, the operation contact e ₁ closed → first relay G operates, its open contacts g ₂ and g ₆ open → the second relay F returns, its operating contact f ₁ opens → the automatic switchgear H becomes non-voltage and remains mechanically locked in the cut-off state. . The time release contact g ₂ is opened and the operation contact g _1, since g ₃ is closed switch M is open delay time (eg 0,6 sec)
Open later → The fault section is disconnected (do not re-enter).
That is, the circuit breaker (CB) of the substation is not interrupted, and the healthy section on the substation side from the distribution section where the automatic section switch of the present invention is installed is maintained in a state where no power failure occurs.

[0047]

Operation of short-circuit fault of automatic segment switch of Embodiment 3 When short-circuit fault occurs during power transmission → Ground fault direction relay E inoperative,
Its operation contact e ₁ open → short-circuit protection relay operation inverse time characteristic of the substation → operation time (e.g., 0.2 seconds) breaker substation after (CB) blocking → No voltage → automatic sectionalizing switch device H is restored , operating contact f ₁ open → open delay time (for example, 1.0 seconds)
After that, the switch M is opened, and the short-circuit fault section is cut off by the reclosing of the substation.

[0048]

Example 3 of the automatic sectionalizing switches of the ground-short-circuit fault operation when concurrent] ground direction relay E operation of the ground fault and short-circuit fault occurs simultaneously in transmission 2, the operation contact e ₁ closed → The first relay G operates, and the open contacts g ₂ and g _{6 are} opened, and the open contacts g ₂ and g _{6 are} closed. At the same time the substation circuit protection relay operation → operating time (e.g., 0.2 seconds) breaker interrupting the substation after → no voltage → ground direction relay E returns, the operation contact e ₁ open → first relay G return, the open contacts g ₂ and g _{6 are} closed, and the open contacts g ₂ and g _{6 are} open. Also, the non-voltage of the → automatic sectionalizing switch device H is restored, the operation contact f ₁ open → open delay time T (eg,
1.0 second), the switch M of the high-voltage switch S is opened,
The re-closing of the substation cuts off the short-circuit and ground fault sections.

[0049]

Embodiment 4 A current transformer (CT) and an overcurrent relay are added to the automatic segment switch shown in FIGS. 1 and 2, and the first relay G operates only when the load current is equal to or less than the set value. In this way, an automatic segment switch having characteristics similar to those of the automatic segment switches of FIGS. 1 and 2 can be obtained.

[0050]

[Example 1 of use] Next, an example of use of the automatic section switch of the present invention will be described. The automatic section switch according to the present invention is arranged at an arbitrary section point of the timed progressive transmission line 1 as shown in FIG. 4, for example. In FIG. 4, the automatic segment switch of the present invention is indicated by a double circle, and the conventional automatic segment switch is indicated by a single circle.

[0051]

[For ground fault When ground fault occurs in the distribution leg A5 in FIG. 4, the ground fault current flows in the arrow direction in the drawing, a ground fault direction relay operation of the automatic sectionalizing switches B ₃ of the present invention Then, the automatic sorting switches B ₃ , B ₄ and B ₅ are opened. The operation time of the ground fault protection relay of the substation (e.g., 0.8 seconds) is not open delay time (e.g., 0.6 seconds) of the automatic sectionalizing switches B ₃ also breaker CB long since substation than the cut-off . Ground fault is A ₃
When it is closer to the substation, the circuit breaker CB of the substation operates to shut off.

[0052]

[Ground when a fault has been eliminated this time is the automatic sectionalizing switches B ₃ in FIG. 4 is reclosed after on time to start (7 seconds), further automatic sectionalizing switch B ₄ are on time (7 seconds) after being turned on again (this time automatic classification switchgear automatic sectionalizing switches B ₄ is mechanically locked), detected to be power to the next distribution leg (distribution leg ground fault has been resolved a ₅₎ time (6 seconds) ground fault is not detected during the subsequent return to the lock is released the normal state of the automatic sectionalizing switches device for an automatic sectionalizing switches B _4. Automatic section switch B ₅ also on time (14
Seconds) and then re-enter.

[0053]

[Ground when a fault continues this time is the automatic sectionalizing switches B ₃ in FIG. 4 is reclosed after on time to start (7 seconds), further automatic sectionalizing switch B ₄ are on time (7 seconds ) later turned on again (this time automatic classification switchgear automatic sectionalizing switches B ₄ is mechanically locked), and the transmission to the next distribution leg (distribution leg ground fault continues a ₅₎ When ground fault direction relay automatic sectionalizing switches B ₃ operates within the automatic section switch B ₄ of the detection time (6 seconds), the automatic sectionalizing switch B ₃ is opened blocked after its opening delay time, automatic section switch B ₄ detach the a ₅ between the earth絡区, and remains its automatic sectionalizing switch device is mechanically locked so as not to be turned on again. Automatic section switch B ₃ is restored ground direction relay the automatic sectionalizing switches B ₄ is opened to retrocession closed. Automatic section switch B ₄ does not return again turned for automatic sectionalizing switch device is locked, automatically sectionalizing switch B ₅ its on time (14
Seconds) and then re-enter.

The automatic segment switches B _{1 to} B ₅ in FIG.
Table 1 summarizes the functions of the circuit breakers CB ₁ and CB _{2 in} the substation and the operation status at the time of the ground fault.

[0055]

[Table 1]

[0060]

[Usage Example 2] Another usage example of the automatic segment switch according to the present invention will be described with reference to FIG. FIG. 5 shows an example in which the automatic sorting switches of the present invention are arranged in parallel in one feeder. In FIG. 5, the automatic segment switch of the present invention is indicated by a double circle,
The conventional automatic section switch is indicated by a single circle.

[0061]

When the ground fault occurs in the distribution leg A ₇ 9. ground fault at Figure 5 ground fault current flows in the arrow direction in the drawing, a ground fault direction relay operation of the automatic sectionalizing switches B ₅ of the present invention Then, it is opened after an opening delay time (eg, 0.6 seconds). The automatic sectionalizing switch B ₆ for load side than the opening of the automatic sectionalizing switches B ₅ is no voltage, B ₇ also open. Operation time (e.g., 0.8 seconds) of the ground fault protection relay substations opening delay time (e.g., 0.6 seconds) of the automatic sectionalizing switches B ₅ long because neither blocked breaker CB substation from. In addition, not a power failure at all even healthy section of the substation than the automatic section switch B _5. When the ground fault is on the substation side from the automatic sectionalizing switch B ₅ of the present invention, the circuit breaker CB in the substation is interrupted in operation.

[0062]

[When the ground fault is followed] At this time, the automatic sectionalizing switch B ₅ and reclosing after on time (35 seconds) in FIG. 5, further after an automatic section switch B ₆ is on time (7 seconds) on again, because the automatic sectionalizing switch B ₅ ground fault current flows into the detection time (6 seconds) to re-blocking, the automatic sectionalizing switch B ₆ are open to the detection time, the automatic classification switchgear machine Is locked. Since returned again closed automatic sectionalizing switch B ₅ by opening the automatic section switch B _6, the voltage to the automatic section switch B ₆ is applied, the automatic sectionalizing switch B ₆ is mechanically locked, It is separated without re-injection.

The automatic segment switches B _{1 to} B ₇ in FIG.
Function of the circuit breaker CB ₁ substation and summarized the operation status at the time of ground fault is shown in Table 2.

[0064]

[Table 2]

[0065]

The automatic section switch according to the first aspect has the following effects. (1) Since the automatic section switch of the present invention always shuts off before the circuit breaker of the substation shuts down at the time of ground fault, the substation is uninterrupted and the distribution section where the automatic section switch of the present invention is installed is installed. The healthy section on the substation side does not lose power at all, and the faulty section is separated by the reclosing and reclosing operations of the automatic segment switch of the present invention. (2) In the event of a short-circuit fault, the circuit breaker at the substation is cut off before the automatic section switch, so that a short-circuit current (large current) flows through the automatic section switch and the automatic section switch does not explode. (3) In the automatic segment switch according to claim 2, a zero-phase current transformer ZC
Since there is a T, zero-phase transformer ZPD, the automatic section switch itself can detect a short-circuit fault. (4) In the event of a ground fault, the automatic section switch is always opened and shut off before the circuit breaker (CB) of the substation is shut off, and the ground fault section is cut off. The power outage will occur only after the power distribution section of, and there will be no power failure in the healthy section on the substation side from the power distribution section with the ground fault. (5) The open delay circuit 3 can arbitrarily select the open delay time T. (6) Since the open delay time is set longer than the operation time of the short-circuit protection relay of the sub-time limit characteristic of the substation, the short-circuit protection relay of the substation shuts off first and the automatic switchgear explodes when a short-circuit fault occurs in the distribution section. Nothing to do. (7) By arbitrarily selecting the time constant of the diode D ₁ and the resistor R, can be selected opening delay operating time of ground fault protection relay of the substation than the shorter arbitrary time.

[0066]

According to the second aspect of the present invention, the automatic section switch has the same effect as the automatic section switch of the first aspect.
There are also the following effects. (1) diode D ₁ and the resistor R ₁ connected in series, R
_The open delay time can be set to an arbitrary time by arbitrarily selecting the time constant of ₂ . (2) becomes normal times longer open time delay resistor R ₂ is short-circuited in the open delay circuit, at the time of ground fault is inserted resistor R ₂ is automatically a series resistance R ₁ + R ₂ next opening delay time Automatically shortened. Therefore, in the event of a short-circuit fault, the short-circuit protection relay of the substation's anti-time characteristic shuts off first, and in the case of a ground fault, the automatic section switch shuts off before the substation's ground fault protection relay, and the ground fault fault section is cut off. When a short circuit fault occurs, short-circuit current does not flow through the automatic segment switch and the automatic segment switch does not explode. In addition, in the event of a ground fault, the substation is uninterrupted, and there is no power interruption in a healthy section on the substation side from the distribution section where the automatic switchgear of the present invention is installed.

[0067]

According to the third aspect of the present invention, the automatic sectional switch of the third aspect has the same effect as the automatic sectional switch of the first aspect.
There are also the following effects. (1) Since the coil of the operating electromagnet m of the switch M is divided into two or more, the open delay time can be set to an arbitrary time by arbitrarily selecting the number of turns of the divided coils L ₁ and L _2. . (2) Split coil L ₁ at all times and in the event of a short-circuit fault,
L ₂ is longer the open delay time are connected in series, the open delay time are connected in parallel at the time of ground fault is shortened automatically. For this reason, in the event of a short-circuit fault, the short-circuit protection relay of the sub-time limit characteristic of the substation shuts off first, and in the case of a ground fault, the automatic section switch shuts off before the ground fault protection relay of the substation,
The short-to-ground fault section is cut off, and the short-circuit current flows through the automatic section switch in the event of a short-circuit fault, and the automatic section switch does not explode. There is no power outage in the healthy section on the substation side from the distribution section where the equipment is installed.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a first embodiment of an automatic section switch of the present invention.

FIG. 2 is an explanatory view showing a second embodiment of the automatic section switch of the present invention.

FIG. 3 is an explanatory view showing a third embodiment of the automatic sorting switch of the present invention.

FIG. 4 is an explanatory diagram showing an example of the arrangement of the automatic sectioning switch of the present invention on a timed progressive feeder.

FIG. 5 is an explanatory view showing another example of the arrangement of the automatic section switch of the present invention on a timed progressive transmission line.

FIG. 6 is an explanatory diagram of a conventional timed progressive feeder.

FIG. 7 is an explanatory diagram of an operation of the first automatic section switch according to the present invention in a normal state.

FIG. 8 is an explanatory diagram of an operation of the first automatic section switch of the present invention at the time of a ground fault.

FIG. 9 is an explanatory diagram of the normal operation of the second automatic section switch of the present invention.

FIG. 10 is an explanatory diagram of the operation of the second automatic section switch of the present invention at the time of a ground fault.

FIG. 11 is an explanatory diagram of an operation at the time of a short-circuit failure of the second automatic segment switch according to the present invention.

FIG. 12 is an explanatory diagram of an operation of the third automatic section switch according to the present invention in a normal state.

FIG. 13 is a diagram illustrating the operation of the third automatic switchgear according to the present invention when a ground fault occurs.

[Explanation of symbols]

1 is a timed progressive distribution line 3 is an open delay circuit 4 is a variable open delay circuit A ₁ , A ₂ is a distribution section B ₁ , B ₂ is an automatic section switch ZCT is a zero-phase current transformer ZPD is a zero-phase transformer Switch S is a high voltage switch E is a ground fault relay G is a first relay F is a second relay M is a switch H is an automatic switchgear D ₁ is a diode R, R ₁ and R ₂ are resistors m electromagnets L _1, L ₂ denotes a coil for actuating the electromagnet

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-154720 (JP, A) JP-A-53-54759 (JP, A) JP-B-52-29813 (JP, B2) 41384 (JP, Y2) JP 42-10766 (JP, B1) Protective Relay Handbook, 2nd edition, 8th printing (55-7-20) Ohmsha, P. 431-432 (58) Fields investigated ( Int.Cl. ⁷ , DB name) H02H 7/26 H02H 3/093 H02J 3/00-3/04

Claims (3)

(57) [Claims] 1. A ground fault and a detection function of detecting, timed progressive type distribution line (1) of the distribution leg (A _1, A ₂ · · ·) either distribution leg in (A _1, A ₂ …) And an open / close function that opens and closes earlier than a substation circuit breaker when a ground fault occurs.
Automatically on again after opening blocked, and returned again introduced as required with separate the disconnection function of the ground fault section, it is installed at an arbitrary division point of distribution leg (A _1, A ₂ ···) The automatic sorting switch for opening and closing the distribution section (A ₁ , A ₂ ...) Includes the following devices and circuits (1) to (6). (1) Distribution section (A ₁ , A ₂ ) of timed progressive transmission line (1)
…)) To detect a zero fault current transformer (ZC
T) and zero-phase transformer (ZPD). (2) A high-voltage switch (S) that opens and closes the substation side and the load side of the timed progressive distribution line (1). (3) The open delay time in the event of a ground fault in any of the distribution sections (A ₁ , A ₂ ...) Is shorter than the operation time of the ground fault protection relay of the substation, and the short-circuit protection of the sub-time limit characteristic of the substation. Fixed open delay circuit (3) that is set longer than the operation time of the relay. (4) The fixed open delay circuit (3) has a resistor (R)
The series circuit of the resistor (R) and the diode (D ₁ )
There is connected in parallel to the actuating electromagnet of the switch in the high pressure opening閉器(S) (M) (m ). (5) Zero-phase current transformer (ZCT), ground fault direction relay (E) which operates by receiving zero-phase current and zero-phase voltage from zero-phase transformer (ZPD). (6) A first relay that operates by the operation of the ground fault direction relay (E) to control the opening / closing of the high-voltage switch (S), the subsequent re-input and re-input, the input time and the detection time after the input. (G), a second relay (F), an automatic section switchgear (H) having a timer and a lock mechanism. 2. A ground fault and a detection function of detecting, timed progressive type distribution line (1) of the distribution leg (A _1, A ₂ · · ·) either distribution leg in (A _1, A ₂ …) And an open / close function that opens and closes earlier than a substation circuit breaker when a ground fault occurs.
Automatically on again after opening blocked, and returned again introduced as required with separate the disconnection function of the ground fault section, it is installed at an arbitrary division point of distribution leg (A _1, A ₂ ···) An automatic sorting switch for opening and closing a distribution section (A ₁ , A _2, ...) Provided with the following functions (1) to (5) and equipment. (1) Distribution section (A ₁ , A ₂ ) of timed progressive transmission line (1)
…)) To detect a zero fault current transformer (ZC
T) and zero-phase transformer (ZPD). (2) A high-voltage switch (S) that opens and closes the substation side and the load side of the timed progressive distribution line (1). (3) The open delay time in the event of a ground fault in any of the distribution sections (A ₁ , A _2. A variable open delay circuit (4) for setting longer than the operation time of the relay. (4) Zero-phase current transformer (ZCT), ground-fault direction relay (E) that operates by receiving zero-phase current and zero-phase voltage from zero-phase transformer (ZPD). (5) The first relay which operates by the operation of the ground fault direction relay (E) to control the open / close of the high-voltage switch (S), the subsequent re-input and re-input, the input time and the detection time after the input. (G), a second relay (F), an automatic section switchgear (H) having a timer and a lock mechanism. (6) The variable open delay circuit (4) is connected to a resistor (R ₁ ,
R ₂ ), its resistance (R ₁ , R ₂ ) and diode
A series circuit with (D ₁ ) is connected in parallel to the operating electromagnet (m) of the switch (M) in the high-voltage switch (S), and the resistor (R ₂ ) opens the first relay (G). contact (g ₂₎
Are connected in parallel and the resistor (R ₂ ) is short-circuited in normal times. When a ground fault occurs, the resistor (R ₂ ) is automatically inserted in series with the diode (D ₁ ) and the resistor (R ₁ ). When the open delay time is set to normal operation, it is longer than the operation time of the short-circuit protection relay of the sub time limit characteristic of the substation. It can be changed to be shorter. 3. A ground fault and a detection function of detecting, timed progressive type distribution line (1) of the distribution leg (A _1, A ₂ · · ·) either distribution leg in (A _1, A ₂ …) And an open / close function that opens and closes earlier than a substation circuit breaker when a ground fault occurs.
Automatically on again after opening blocked, and returned again introduced as required with separate the disconnection function of the ground fault section, it is installed at an arbitrary division point of distribution leg (A _1, A ₂ ···) An automatic sorting switch for opening and closing a power distribution section (A ₁ , A _2, ...) Having the following functions and devices. (1) Distribution section (A ₁ , A ₂ ) of timed progressive transmission line (1)
…)) To detect a zero fault current transformer (ZC
T) and zero-phase transformer (ZPD). (2) A high-voltage switch (S) that opens and closes the substation side and the load side of the timed progressive distribution line (1). (3) The open delay time in the event of a ground fault in any of the distribution sections (A ₁ , A _2. A variable open delay circuit (4) for setting longer than the operation time of the relay. (4) Zero-phase current transformer (ZCT), ground-fault direction relay (E) that operates by receiving zero-phase current and zero-phase voltage from zero-phase transformer (ZPD). (5) The first relay which operates by the operation of the ground fault direction relay (E) to control the open / close of the high-voltage switch (S), the subsequent re-input and re-input, the input time and the detection time after the input. (G), a second relay (F), an automatic section switchgear (H) having a timer and a lock mechanism. (6) The variable open delay circuit (4) divides the coil of the operating electromagnet (m) of the switch (M) in the high-voltage switch (S) into two or more coils (L ₁ , L ₂ ). The coils (L ₁ , L ₂ ) are connected in series during normal and short-circuit faults, and the open delay time is longer than the operation time of the short-circuit protection relay at the substation. ₁ , L ₂ ) are connected in parallel and can be varied so that the open delay time is shorter than the operation time of the ground fault protection relay of the substation.