JPH0359528B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a switch control device for controlling a switch for a power distribution line led out from a power distribution substation.

(Technical background of the invention and its problems) As shown in Figure 1, the busbar of distribution substation SS ₁
Distribution line DL ₁ led out from BUS ₁ via feeder breaker (hereinafter simply referred to as breaker) CB ₁ is
An appropriate section d ₁ d ₂ is established using voltage-free open type distribution line switches (hereinafter simply referred to as switches) 5 ₁ , 5 ₂ , and 5 ₃
... _d4 , and the terminal section _d4 is connected to the terminal section of another distribution line DL ₂ by a switch ₅₄ . Although not shown, this substation is equipped with a re-closing device for re-closing the circuit breakers in addition to relays for protecting the distribution lines. These switches 5 ₁ , 5 ₂ , and 5 ₃ use the voltage of the distribution line as a control voltage, and as a result, they are opened without voltage when the distribution line is out of power. In addition, the switches 5 ₁ , 5 ₂ , 5 ₃ are always closed,
Switch 5 ₄ is kept open at all times. For convenience of explanation, the installation parts of the switches 5 ₁ to 5 ₃ are called normally closed points S ₁ , S ₂ , S ₃ , and the installation part of the switch 5 ₄ is called a normally open point L.

By the way, in the case of power distribution systems, each switch is equipped with a timed fault investigation device (hereinafter referred to as a timed control device) to determine the faulty section and to supply power to the healthy section adjacent to the faulty section. In addition to this, in order to change the connection of the distribution line or to cut power to a specific section due to construction, etc., the normally closed point of the characteristic can be turned off and the normally open point can be turned off using remote control from the central unit 3. In some cases, a system in which slave stations 2 _{1 .} . . 2 ₆ of the remote control device are provided for each of the normally closed and normally open points has been adopted. In this case, the control outputs to the switches at the normally closed point are combined as shown in FIG. In FIG. 2, 6 is a power transformer, and the secondary side voltage is used as a power source for the switch control circuit. 4 is a time-limited control device, X is a timer for closing time, and when a voltage is generated on the secondary side of the power transformer 6, that is, when voltage is applied to the distribution line _d3 , it is energized through the contacts of the latch relay L. , self-holding by closing _the self-holding contact
Close contacts X ₂ , X ₃ , and X ₄ immediately after the time limit.

A voltage is applied to the lock side of the latch relay L through the contact _x3 , and the latch relay L becomes in the locked state. This locked state refers to a state in which closing of the switch is locked. At the same time, voltage is applied to timer Y for accident detection time (Y time) through contact x ₂ ,
Timer Y continues to be excited. When the predetermined Y time period has elapsed, the timer Y immediately operates, and a voltage is applied to the unlock side of the latch relay L through the time contact _y2 to bring the latch relay L into the unlock state. In other words, the switch is enabled to close. If an accident occurs within Y time and the latch breaker is disconnected due to the operation of the protective relay, the secondary voltage of the power transformer 6 will be lost, the latch relay L will remain locked, and then the power transformer Even if voltage is applied again from 6, since contact 1 is in an open state, no voltage is applied to timer X, and output contact x ₄ will not close. In other words, the normally closed point _S3 is in the closing lock state.

In FIG. 2, 2 is a slave station of the remote control device, and is composed of a control circuit C and a mechanical latch relay _R1 . The control circuit C has an address assigned to each slave station, and is connected to a transmission line 8 that transmits "on" and "off" signals from the central device (3 in Figure 1).
When it receives an ``in'' signal addressed to its own station, contact <sub>C1</sub> is instantly turned on, and conversely, when it receives an ``off'' signal, contact _C2 is instantly turned on. The mechanical latch relay _R1 is driven to the ON state by the contact _C1 , and mechanically maintains the ON state even if the signal is lost. Contact C ₂ only when receiving the “off” signal.
is returned to the OFF state. Next, the response when accident F occurs in section _d4 of the distribution line will be explained using FIGS. 1 and 2.

When accident F occurs, the substation circuit breaker CB ₁ is disconnected by the operation of a protection relay (not shown).
Therefore, the switches 5 ₁ , 5 at each normally closed point S ₁ , S ₂ , S _3
2 and 5 ₃ open all at once. The shield breaker CB ₁ is reclosed by the action of a recloser (not shown). As a result, a voltage is first applied to the section _d1 , so the timer X of the time-limited control device ₄₁ at the normally closed point _S1 is excited, and operates after the X time period to close the contact _x4 . For convenience of explanation, it is assumed that the central device 3 outputs "on" signals to all normally closed points S ₁ , S ₂ , and S ₃ . By closing the contacts _x4 , the switch ₅₁ is closed, and voltage is applied to the next section _d2 . Since there is no accident in this section d ₂ , Y operates after a predetermined time and switch 5 ₁
The input lock is released. Regarding the time-limited control device ₄₂ , the timer X operates in the same way,
The switch ₅₂ is closed, and the closing lock for the switch ₅₂ is released by the operation of the timer Y. Therefore, by applying power in section d ₃ , the next time-limited control device 4 ₃
When voltage is applied to the power transformer ₆ of
Breaker CB ₁ breaks again, and distribution line DL ₁ is cut off again. The time from when voltage is applied by switching on switch ₅₃ until the power is cut off is of course determined by timer Y.
is shorter than the Y time period. For this reason, the time control device 4
₃ locks the closing of the switch ₅₃ . Then, after a predetermined time, when the breaker CB ₁ closes again, 4 ₁ ,
4 ₂ operates in the same way as described above, but 4 ₃ has the switch 5 ₃ closed and locked, so in the end, the healthy section d ₁ ,
This means that d ₂ and d ₃ are charged.

In addition, in the above explanation, the central device 3 is connected to each normally closed point.
The case where an "on" signal is being sent to S ₁ , S ₂ , and S ₃ , but if an "off" signal is being sent to a slave station of normally closed point S ₂ , contact r ₁ is in an open state, so the switch ₅₂ is not closed.

As mentioned above, in the conventional device, the output contact of the time-limited control device and the output contact of the slave station are connected in series to the operation coil of the switch, so that the central device Even if the output contact _r1 is turned on by controlling the switch to turn on, the output contact _x4 is turned off within the closing time limit (X time limit) of the time-limited control device 4, and the switch 5 cannot be closed. I can't. That is, even if the central device 3 controls the "on", in the worst case, there is an inconvenience in that it cannot be turned on until after X time period (generally 7 to 14 seconds x N). Additionally, the time-limited control device 4 installed at the normally closed point S has directionality (the output contacts x ₄ are turned ON after X time period only when voltage is applied from the power supply side), and the normally open Since point L is controlled only by the slave station, the power supply side of normally closed point S (the side connected to the substation or disconnector CB) may be switched, or the normally closed point When the point changes from a point to a normally open point, work such as replacing the contact with the power transformer 6 or removing the time-limited control device 4 is required.

Furthermore, in Fig. 1, section d ₆ of distribution line DL ₂
Due to power outages due to construction, etc., the normally closed point _S5 is controlled remotely.
is set to ``OFF'', the normally open point L is set to ``ON'', and when section _d5 is energized from the disconnector CB ₁ , if an accident happens to occur in section _d5 , the normally open point L is set to ``ON''. Since no time-limited control device is installed at point L as mentioned above, the accident occurs again after switch 5 ₃ is closed due to the re-closing operation of break breaker B ₁ , and as a result, normally closed point S ₃ is closed. This caused the inconvenience that it was impossible to distinguish whether the accident occurred in section _d4 or section _d5 .

(Object of the invention) The present invention has been made in view of the above-mentioned disadvantages.
Its purpose is to provide immediate access via remote control.
It is an object of the present invention to provide a switch control device that can be switched off and quickly controlled by a time-limited control device in the event of an accident, and that can also easily respond to system changes.

(Summary of the Invention) The present invention provides a device for controlling a voltage-free open type distribution line switch that divides distribution lines into appropriate sections by combining a time-limited control device and a slave station of a remote control device. The control output to the switch can be turned on by remote control.
The output of the time-limited control device is valid from when it is controlled until it is turned off after a power outage, and the output of the slave station takes priority from when it is turned on by remote control until the first power outage. This is a switch control device characterized by having the following configuration.

(Embodiment of the Invention) An embodiment of the present invention will be described with reference to FIGS. 3 and 4. In FIG. 4, the control device 1 is connected to the secondary sides of power transformers 61 and 62 that detect the presence or absence of the distribution line d _i and d _i+1 voltages on both sides of the switch 5 and supply electricity. A time-limited control device 4' that controls the output according to the voltages _e1 and _e2 of the central device 3 is connected to a transmission line 8 that transmits the control signal from the central device 3, A switching circuit 9 generates a voltage output ₃ if either or both of voltages e ₁ and e ₂ are present. Furthermore, switching circuit 9
The contact is switched to the voltage application side in response to the application of voltage e ₁ or e ₂ , and when both voltages e ₁ and e ₂ are applied, priority is given to the voltage applied first.

The distribution lines d _i and d _i+1 usually have three phases, and the power transformers 61 and 62 are single-phase, so they are connected to two of the three phases. Therefore, e ₁ and e ₂ may not be in phase, and if the secondary side of the power transformer is directly connected to obtain e ₃ , a short circuit will occur, which is why the switching circuit 9 is necessary.

FIG. 3 is a diagram showing an embodiment of a time-limited control device 4' and a slave station 2' according to the present invention. Compared to the conventional example, the slave station 2' according to the present invention is excited by the contact _c1 that turns on instantly upon receiving an "in" signal from the central device 3, and is self-held by its own output contact _r2 . A new auxiliary relay R ₂ is provided, and the output contact r ₃ (which operates in synchronization with _{r 2} ) of this auxiliary relay R ₂ is connected to the contact 4 ′ of the time-limited control device 4 ′ shown in FIG. 4, as will be described later. _-a and contact _r1 of latch relay _R1 are connected in parallel to the series circuit. In this way, the slave station 2' is turned on by the "in" signal from the central device 3, and the first output contact _r1 , which does not change state before and after a power outage, is turned on by the "in" signal and turned "off". It has a second output contact _r3 that turns OFF when a signal or power outage occurs.

The time-limited control device 4' includes power transformers 61 and 62.
Rectifiers D ₁ and D ₂ are connected to the secondary side of the power transformer 61, respectively, and the voltage on the power transformer 61 side is directly taken into the inside and becomes a power source. The voltage on the power transformer 62 side is connected in parallel with the power transformer 61 side and becomes an internal power source when the changeover switch SW ₁ is switched to the "forward/reverse phase" side. Timer X has latch relay L b.
Power is supplied via contact 1 and self-holding contact x ₁ in parallel. Power is supplied to timer Y through timer X's time limit a contact x ₂ and self-holding contact y ₃ connected in parallel. On the lock side of the latch relay L, there is a timer Y timer B contact _y1.
Then, power is supplied through the timer A contact x ₃ or instantaneous a contact x ₅ of the timer X and the changeover switch SW ₂ , and power is supplied to the lock release side through the timer A contact y ₂ of the timer Y. Output 4'- _a of timed control device 4' is constituted by instantaneous a-contact _y4 of timer Y.

In the above configuration, selector switch SW ₁
And if SW ₂ is set to "progressive", when voltage is applied from the power transformer 61 side,
Voltage is applied to timer
A voltage is applied to timer Y by x ₂ . When 4' _-a is outputted by the instantaneous a contact _y4 , the operation coil 5C of the switch 5 is energized, and the contact of the switch 5 is closed. Similarly, timed B contact y ₁ and timed A contact x ₃
This causes the latch relay L to become locked. If voltage continues to be applied to timer Y, time limit a will be reached after Y time limit.
By closing contact _y2 , the latch relay L is released. If a fault current flows due to a power outage during the Y time period, that is, the closing of switch 5, and the distribution line is cut off again due to the breaker CB ₁ being ruptured, the latch relay L remains in the locked state, so the latching relay L remains in the locked state. Even if voltage is applied due to the re-closing of , B contact 1 is open, so no voltage is applied to timer X, and therefore no voltage is applied to timer Y, so output contact y ₄ remains open. Become.

Changeover switches SW ₁ and SW ₂ are for "forward/reverse feed"
When the voltage is set to the side, if voltage is applied only from either power transformer 61 or 62, 4' _-a is output in the same manner as in the "progressive" mode.

However, when a voltage is applied to the timer X, the latch relay L is immediately locked by the instantaneous a contact _x5 . Note that the lock is released when the Y time limit is completed, as in the case of "progressive feed". That is, if there is a power outage during the X time period or the Y time period, the device will be in a locked state.

The control output to the switch is, _as already explained _{in FIG .} Coil 5C operated through a series circuit with
and at the same time the voltage output e ₃ to the auxiliary relay
The power is supplied to the operating coil 5C via the output contact _r3 of _R2 .

In this way, among the contacts connected to the operating coil 5C, the output contact 4' _-a of the time-limited control device
Since the contact _r1 connected in series with the switch is the contact of a mechanical latch relay, and the contact _r3 connected in parallel is the contact of a normal auxiliary relay with instantaneous operation and instantaneous return, the control output to the switch is as follows. “Turn on” with remote control
Output contact 4' _-a of the time-limited control device is valid from when it is controlled until it is turned off after a power outage, and from when it is turned on by remote control until the first power outage. is configured so that output contact _r3 of the slave station takes priority.

The operation of the present invention will be explained with reference to FIGS. 1, 3, and 4. When the switch CB ₁ of the substation SS is turned on and electricity is applied to section d ₁ of the distribution line DL ₁ , contact 4' _-a is still OFF, so
No voltage is applied to the section _d2 yet. At this time, by sending an "in" signal from the central device 3, both output contacts r ₁ and r ₃ of the slave station 2 ₁ are turned ON,
Immediately power transformer 61, switching circuit 9, output contact r ₃
Electricity is supplied to the operating coil 5C via the switch 51, and the switch ₅₁ is turned on even before the end of the X time period of the time-limited control device 4' to supply electricity to the section _d2 .

If an accident occurs in section _d2 in this state, the substation's protection relay will operate, tripping the circuit breaker _CB1 and cutting off power to sections _d1 and _d2 . Due to the power outage, the switch 5 ₁ is opened without voltage, and thereby the second output contact r ₃ of the slave station 2 ₁ is turned OFF. However, the first slave station
Output contact _r1 is mechanically latched and remains in the ON state. When breaker CB ₁ recloses, the section
Electricity is applied to d ₁ and voltage e ₁ is generated on the secondary side of power transformer 61, but voltage e ₂ is not generated on the secondary side of power transformer 62. If this state continues for X time, the time-limited type Output _contact 4' _-a of control device 4'1 is turned ON.
Since the first output contact _r1 of slave station _2'1 continues to be in the ON state, it is operated via the power transformer 61, switching circuit 9, first output contact _r1 , and output contact 4' _-a . Electricity is supplied to the coil 5C and the switch ₅₁ is turned on.
Then, electricity is supplied to section d ₂ where the accident is continuing, and immediately the circuit breaker CB ₁ trips again, and the section
d ₁ and d ₂ are out of power. That is, the time-limited control device _4'1 experiences a power outage within the detection time limit (Y time limit), and the output contact 4' _-a remains OFF and becomes locked. Therefore, even if the circuit breaker closes again and electricity is applied to the section _d1 , the output contact 4 _-a of the time-limited control device _4'1 will not turn ON and the switch ₅₁ will not be closed, so the accident section will not be closed. Electricity is not supplied to d ₂ and it is disconnected from the grid. That is, in the event of a distribution line fault, the time-limited control device _4'1 operates normally. In addition, even if the "on" signal is accidentally given to the normally closed point _S1 from the central device 3,
Since no control voltage is generated, the switch ₅₁ will not be erroneously closed.

Next, a case will be described in which the switch ₅₁ is turned on by the "on" control of the central device 3, and the section _d2 is to be cut off for construction work or the like. When the central device 3 sends a "cut" signal, the first and second output contacts _r1 and _r3 of the slave station _2'1 are turned off, so
The switch ₅₁ is opened and the power is cut off in the section _d2 .

In other words, if the configuration is as shown in Figure 4, in the event of an accident, the accident section can be quickly separated using a timed control device, and switches for construction work etc. can be turned on and off instantly using remote control. Can be done.

Furthermore, a case will be described in which the time-limited control device 4' is used for forward and reverse feed in FIG. 3, and is installed in all the switches as shown in FIG. A time-limited control device for forward and reverse transfer is a control device that controls when voltage is applied only from either the secondary voltage e ₁ or e ₂ of the power transformer.
Output contact 4' _-a is turned on after X time period, and if there is a power outage during X time period and Y time period, output contact 4' _-a is turned ON.
It is locked when it is OFF. In FIG. ₅ , _the dividing points S ₁ , S _{2 ,} .

Now, when operating segmentation point S ₄ as a normally open point and the others as normally closed points, the central unit 3 performs "in" control on _{the slave stations except S 4 ,} and On the other hand, if "off" control is performed, the output contacts r ₁ and r ₃ of slave stations of S ₁ , S ₂ , S ₃ and S ₅ , S ₆ will be ON, and the output contacts of S ₁ to S ₃ and S ₅ to _{S 6} will be turned on. The on-off switch is turned on, and as explained earlier, after a power outage due to an accident, the switch 5 will be controlled by the output contact 4' _-a of the time-limited control device. division point
Since the output contacts _r1 and _r3 of the slave station of _S4 are OFF, the switch of _S4 remains open. Next, when changing the power distribution system and moving the normally open point from S ₄ to S ₅ , if you control S ₅ to "off" and control S ₄ to "on" using the central unit 3, The timed controller at _S4 is enabled and the output from the timed controller at _S5 is ignored, thus moving the normally open point from _S4 to _S5 .
At this time, if an accident F occurs in the section _d4 of the distribution line, the output contact 4' _-a of the time-limited control device _4'3 of _S3 is turned OFF and locked by the re-closing operation of the circuit breaker _CB1 . As explained above, since the output of the time-limited control device of _S4 also uses "forward and reverse feed", there will be a power outage within the X time period, and it will be locked when turned OFF. Therefore, even if the normally open point _S5 is controlled to be turned on by the central device 3 in order to rescue the healthy section _d5 that is experiencing a power outage, and power is applied to the section _d5 from the disconnector _CB2 side, The switch ₅₄ at the dividing point _S4 is not closed and the accident zone _d4 is reliably isolated.

In other words, there is no need for construction work such as connection changes due to changes in the power distribution system, and only one type of control device is required.

In addition, in Fig. 5, when the normally open point is _S4 , in order to carry out construction work in section _d6 , the central device 3 controls _S5 , <sub>S6 `</sub> `off'', and <sub>S4 `</sub> `on''. , with power applied to sections d ₁ to _{d 5} from the breaker CB ₁ side,
If an accident occurs in section _d5 , the timed control device ₄₄ of _S4 is activated, so the reclosing operation of disconnector CB ₁ will lock the timed sequential control device of _S4 , and the It becomes clear that an accident occurred on _d5 .

(Effects of the Invention) As described above, according to the present invention, there are two types of output contacts for the slave stations of the remote control device, namely, they are turned ON by an “in” signal from the central device, and turned OFF by an “off” signal. The first output contact does not change state before and after a power outage, and the second output contact turns ON with an "ON" signal and turns OFF with an "OFF" signal or a power outage.
The output contact of the time-limited control device and the first contact are connected in series, the second contact is connected in parallel to this series circuit, and the control is performed via these series-parallel circuits. A voltage is applied to the operating coil, and a timed control device for forward and reverse feed and the slave station are installed at each dividing point.
There is an advantage that the central device can easily change the dividing point from the normally open point to the normally closed point or vice versa, and there is no need to change the connection of the time-limited control device when changing the system.

[Brief explanation of drawings]

Fig. 1 is a system diagram for explaining the conventional switch control system, Fig. 2 is a block diagram showing how to combine control outputs at the conventional normally closed point, and Fig. 3 is a system diagram for explaining the conventional switch control system. FIG. 4 is a wiring diagram showing an example of a slave station, FIG. 4 is a block diagram showing an embodiment of the invention, and FIG. 5 is a system diagram showing an example of application of the invention. 1...Control device, 2'...Slave station, 3...Central device, 4'...Timed control device, r ₁ ...Slave station 1
Output contact of r ₃ ...Second output contact of slave station, 4' _-
a ...Output of timed control device, 9...Switching circuit.

Claims (1)

[Scope of Claims] 1. A power distribution line led out from a distribution substation having a distribution line protection relay and a re-closing device via a disconnector, by a voltage-free open type distribution line switch. In a device that controls a switch of a power distribution system by dividing it into sections as appropriate and combining slave stations of a time-limited control device and a remote control device whose output is controlled by a control signal from a central device for each section, The slave station closes the circuit upon receiving an "in" signal from the central device, opens the circuit upon receiving the "off" signal, and closes the circuit upon receiving the "in" signal, and has a first output contact whose state does not change before and after a power outage; and a second output contact that opens upon reception of "off" or a power outage on the distribution line, and the time-limited control device has a third output contact that closes upon application of the distribution line voltage and opens upon power outage on the distribution line. It has a locking function that locks the switch from turning on in the event of a power outage in the distribution line within a predetermined time after the output contact and this third contact are closed, and the power supply side or load applied to the switch A power supply circuit is provided that includes a power transformer that outputs the voltage of 1 as a control voltage and a switching circuit that outputs either one of the output voltages of the power transformer, and the first output contact and the third output contact are connected in series between the operating coil of the switch and the power supply circuit, and a second output contact is connected in parallel to the series circuit of the first output contact and the third output contact. instrument control device.