JPS5816310A - Static type automatic voltage controller - Google Patents

Abstract

PURPOSE:To protect the load and to prevent the burning of an adjusting transformer, by providing a control circuit to control a breaker and an automatic switch which are set to a static automatic voltage controller of direct switching system. CONSTITUTION:A line led from a substation is connected to a load 2 via a breaker 5, a voltage controller 3 having an adjusting transformer with multistage tap and an automatic switch 6 which form a static automatic voltage controller. A control circuit 8 controls the breaker 5 and the switch 6 and then opens the breaker 5 and then the switch 6 when an overcurrent is detected and when a short circuit is detected between the adjusting transformer and the tap. Then the controller 3 is separated from the line to protect the load and to prevent the burning of the adjusting transformer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a static automatic voltage regulator that adjusts a one-way voltage by switching a thyristor on/off switch, f.

The static type automatic voltage regulator uses a thyristor in the mechanical tag switching device of the conventionally widely used automatic voltage LII alarm device to make it contactless, so it can operate without any limit to the number of times the switch can be switched. It has the feature of shortening the time limit. As a conventional static automatic voltage Mu device, Fig. 1 (4)
As shown in FIG. 2, a series transformer T8 and a regulating transformer TR are provided to connect the thyristors to the y7'tt''-t4 of the 11ij rectifying transformer.

TS S1 to S4 are connected, and the voltage generated in the secondary winding of the series transformer TS is transferred through these thyristor switches.
An indirect switching type is known in which the voltage is applied to the primary winding of the v-regulating transformer T'H. Here, each thyristor switch has 12 thyristors S as shown in Figure 1ω)K.
It consists of CRs and SCRs connected in an inverted row of 5, and by making one of the thyristor switches conductive according to the line voltage, the line voltage is adjusted to a predetermined value by selecting the line voltage. It's happening. Such an automatic voltage regulator without indirect switching has the advantage of being able to use a low breakdown voltage thyristor, but on the other hand, the series t'f! Since two transformers (1 and 111JI transformers) are required, both the size and weight of the device increase, which is a drawback.In addition, when the capacity becomes large, it becomes difficult to install poles, so only small capacity models are realized. There was a drawback that it could not be done. * Also, this indirect switching type had the disadvantage of large losses due to the inclusion of a series transformer. In order to eliminate these drawbacks, it is necessary to adopt a direct switching type configuration that does not use a series transformer, but in the case of a direct switching type, each thyristor switch must be able to withstand the short-circuit current that flows when the load side is short-circuited. It has the disadvantage that it is very expensive because it is necessary. In addition, in a static automatic voltage regulator using a thyristor switch, if the thyristor is erroneously fired due to surge voltage or control circuit suppression, or if the thyristor is permanently destroyed (continuity failure), the gap between the taps is If it were not short-circuited, there was a risk that the regulating transformer would burn out.The purpose of the present invention is to eliminate the need to use a thyristor with a large current capacity, reduce loss, and eliminate the need for short-circuited taps. To provide a static type automatic voltage regulator which prevents a regulating transformer from burning out when

The present invention uses a direct switching type static automatic voltage regulator that combines an interrupter and an automatic switch to detect overcurrent.
I stopped when it happened! In addition to protecting the thyristor by turning on the automatic switch and disconnecting the regulating transformer from the load side line, it is possible to reliably prevent an accident from reaching the load side. Further, when a short circuit between the taps is detected, a control device is provided to open the automatic switch after inserting the above-mentioned interrupter #a, and to control the interrupter and the automatic switch,
By completely disconnecting the regulating transformer from the line in the event of a short-circuit accident between taps, iii* transformer m loss is prevented.

Hereinafter, the present invention will be explained in terms of a static shaft, together with embodiments thereof, with reference to a polished surface.

Figure 2 shows the overall configuration of the present invention together with a power distribution system. The switching type static automatic voltage regulator 5 is inserted into the circuit on the power supply side as well as the voltage regulator 3 and is an interrupter. The first automatic switch 7 is inserted into the circuit on the load side, and the switch 7 switches between the power supply 11 terminal of the cutoff rI5 and the load side terminal of the first automatic switch 6. This is a second automatic switch provided to do so. Reference numeral 8 denotes a control device that controls the voltage regulator 3, the interrupter 5, the automatic switch 11s6 of the switch 1, and the automatic switch 7 of the aE2. Output is input. ltL
The interrupter 5) is also connected to the line on the power supply side and is a ratio control power supply transformer, and the output voltage of this transformer (usually d100V) is supplied to the control device 8 through the control power cable IO and the control power switch 11. There is. 2nd tj! In J, the thick line portion indicates the high voltage portion.

In this embodiment, the static automatic voltage iiiem device 3 is IK3
As shown in the figure, regulating transformers T, T, which are made up of autotransformers having multi-stage taps t1 to t (the number of tags is arbitrary),
11111 Transformation Is T, T OI yput l ~
t@4C SotL each has one end connected to thyristor switches 81 to S, and is a regulating transformer? , one end of the TO transparent tag t1 and the other ends of the 1Illll11 transformer T, T are connected to the output terminals 12r and 12'r through the contacts 61A and 61B of the automatic switch 60 of the irises, and the load side is connected to these output terminals, respectively. lines will be connected. Thyristor switches S1 to S, and I2!11 are each reactors L! ~Connected to one end of L-, reactor L1~
The other end of L is commonly connected and connected to the input terminal 12m via the main contact 51m of the interrupter 5.

M again! 1 transformer T, the other end connected to the output terminal 12'r of T is connected to the input terminal 12'- through the main contact 51B of the interrupter 5, and the input terminal 121°12'sK
The lines on the power supply side (substation side) are connected.

Furthermore, the second automatic switch is connected so as to open and close between the main contact 51 of the interrupter 5 and the power supply value terminal of the SIB and the contacts 61A and 61B of the first automatic switch 6 (D load m terminal). 7 contacts 71 and 71B are Ij! connected.

Reactors L1 to L6 and thyristor switches Sl to S-
Auxiliary Jlb current transformer CT,
~CT- are provided, and the current flowing through the taps tl~t@ is detected by these (D411# current transformers).

Control device 8F1 An automatic tortoise pressure piece adjustment device that controls on-on of thyristor switches 81 to S- according to the output of the voltage W4!1 relay in order to switch the taps of the regulating transformers T and T so as to maintain the line voltage at a predetermined value. In addition to the original control operation, there is also a control operation that continuously applies a firing signal to the thyristor switch connected to a specific tag of the % adjustment transformer to close and open the mustard interrupter, and also to prevent overcurrent. When detected, the interrupter 5 is opened, and then the first automatic switch 6 is opened, and when the opening of the cod l is detected, the wire 2 is automatically opened/closed.
A control operation that closes the interrupter 5 and controls the interrupter, III, and the second automatic switch 6; ￥
and then KJI! The second automatic switch 7 is pressed to close, and a control operation is performed to control the interrupter and the first and second automatic switches.

An example of the configuration of the control device 8 is shown in Fig. 4. In the same figure, 801 is an overcurrent detection circuit, and this detection circuit inputs the output of the current transformer CT provided in the interrupter 5, and sets the line current to a set value 11 (for example, 500A) of J1!1.
When the value exceeds 1, the first overcurrent detection signal with the logical value rlJ is output, and the line current exceeds the second set value 1, which is a ton higher than the first set value (for example, 2500 A). At this time, a second overcurrent detection signal 1 having a logical value rlJ is output together with the first overcurrent detection signal 1. Such an overcurrent detection circuit includes, for example, a rectifier that rectifies the output of the current transformer CT, and first and second comparators that compare the output of the # rectifier with the first and second set values, respectively. is configured.

The second detection signal 1 obtained from the detection circuit is a signal instructing to open the interrupter 5, and this signal is supplied to the transistor Tr1 whose emitter is grounded via the OR circuit OR1. There is. Transistor Tr
The collector of l is connected to the coil of relay RYt and diode DI.
It is connected to the plus side output terminal of the DC power supply 802 through a parallel circuit with the transistor Trl, and when the detection signal 1 of the irises 2 is generated, the transistor Trl becomes conductive and the relay RYt 7k1m is magnetized. 803 is a control power-on detection circuit that outputs one pulse signal when the switch 11 shown in FIG.
The collector of the transistor Try is connected to the positive output terminal of the DC power supply 802 through a single-line circuit consisting of the coil of the relay RY and the diode D. The output of the control power-on detection circuit 803 is also connected to the transistor Trz whose emitter is grounded through an OR circuit ORm, and the collector of the transistor Trm is connected to the DC power source 802 through a parallel circuit of the coil of the relay RY and the diode Ds. Glass noble output terminal/l
c is connected. 805t;! Opening of the tag, that is, opening of the cod f which outputs a detection signal when it is detected that all of the regulating transformers T and T, ft1-t- are disconnected from the power supply and are not energized. In the detection circuit, this T/F open detection circuit 805 receives an input signal from a T/RTM detection circuit 811 (described later), and its output signal is sent to the delay circuit 806 and the OR circuit 0Ra1? and is supplied to the transistor Trs.

Relay RY has a normally open contact RYI and a normally closed contact RYB.

and relay RY, is always &! Contacts RY, , R
Y',.

and normally closed contact RY! b and h. Also relay BY
, is a normally open contact RY3. and this normally R contact RY3. The coil of relay RY4 is connected to DC power supply 802 via the normally closed contacts RY and b.

Relay RYa has normally open contacts RY4&, RY'4. , and one normally open contact BY axis is connected in parallel with the above normally open contacts RY, . Contact point BY of Makurelay RYI.

and contact RYlb of relay RYI are connected in series, and the coil of relay BY is connected to DC power supply 8 through these contacts.
021C is connected. Relay RYg is a normally open contact Ry
=, m ays, and one normally open contact BY, , is connected in parallel to the contact RY, .

Normally open contacts RY, and RY' of relays RYI and BY
,.

It is connected to the interrupter control circuit 807. The interrupter control circuit 807 is equipped with a full-wave rectifier fL@o1 to which an AC voltage of 100 cm is input from the control power transformer 9 shown in FIG. A series circuit of the contacts RY', . . . , the coil of the relay RY, and the normally closed contact RYγb of the relay RY, and a series circuit of the diode D4, the resistor R1, and the capacitor CI are connected in parallel. At both ends of the series circuit of the coil of relay RY- and the normally closed contact RYyb are the coil of relay RY and the normally open contact RY? of the relay RY. , are connected in parallel, and one end of a normally open contact RY,a is connected to the connection point of the resistor R1 and the capacitor C1.

In the example shown in FIG. 4, the interrupter 5 has auxiliary contacts 52A and 52 that open and close in conjunction with these main contacts in addition to the main contacts 51 and 51B that open and close the two single-phase lines, respectively.
Auxiliary contacts 52A and 52B have one end commonly connected to the negative output terminal of the rectifier R@el. The other end of the auxiliary contact 52A is connected to the other end of the normally open contact RY through a trip coil 53T, and the other end of the auxiliary contact 52B is connected to the coil of the relay RY and the contact RYya.
It is connected to the connection point with b. The interrupter 5 is also provided with a closed coil 53C, which is connected in parallel between the DC output terminals of the rectifier R@e1 via the normally open contact RY of the relay RY. .

The first and second automatic switches 6 and 7 are constantly energized automatic switches that do not have a mechanical opening mechanism that closes only while the closed coil CC is energized, and the closed coils of these switches CC is connected to input terminal a through resistor R,
connected between b.

Input terminals a and bfiaK are also connected to a series circuit of resistors R1r and R4 and the coil of relay X, and the relay is connected to both ends of the series circuit via the normally closed contact Xb of relay X. coils are connected in parallel. Capacitor C3 is connected in parallel to both ends of the coil of relay X, and normally open contact M0 of relay M and normally closed contact x'b of relay X are connected in parallel to both ends of resistor R1 and both ends of resistor R3, respectively. There is. Further, 7 live wheel diodes D for delaying the #i opening operation are connected in parallel to both ends of the closed coil CC of the automatic switch 7 of the rattan 2. The input terminals a and bls15 of the first automatic switch 6 are the control power switch 1.
Full-wave rectifier R@ into which the output of transformer 9 is input via 1
The output of el is applied through the normal ga contact RY'l of the relay RY, and the output 12i of the rectifier R@eH is connected in parallel with a smoothing agent condenser tC1. Also irises 2
The output of the full-wave rectifier R@ed, to which the output of the control power transformer 9 is similarly input via the switch 11, is applied between the input terminals a and b of the automatic switch 70, and the full-wave rectifier R@ed is applied between the input terminals a and b of the automatic switch 70. 15!
A smoothing capacitor C4 at the output terminal of the device R@el is connected in parallel.

When a voltage is applied between the input terminals a, l) of the first automatic switch 60, a current flows through the coil of the relay 4 via the contact Xb, and the contact Man closes. As a result, the closed coil cc is excited, and the contacts 61A and 6 of the automatic opening/closing a6
111 closes. The voltage applied between the long sword terminals a and b is also applied to the capacitor C1 via the contact rb and the resistor R4, and when the charging of the capacitor C is completed, the relay X is energized. This opens contacts Xb and Xb,
Relay Mc is deenergized. In this state, the excitation current of the closed coil CC is limited by the resistor R1, and the current of the closed coil C is reduced to the holding current required to keep the switch in the closed state. Further, the excitation current of relay X is also limited to the holding current by resistors R and R4. When the voltage between input terminals a and b is removed, the closed coil CC is deenergized and the contacts 61A and 61B open. The operation of the second automatic opening/closing 467 is the same as described above except that the copying operation is delayed by the flywheel diode DmK.

! 41/, Aoo l All~A4s e
Ant ゝmu JJ and ASS A3・ is a two-person AND circuit, OR, to 0 凰＄ is an OR circuit, F F, % F F
, /d ysu, f 7 o, circuit, A m 1
~Am6 is an amplifier consisting of a transistor, and P凰~P6 is composed of a DC power supply E and a pulse transformer pt.
Fl-F@ is a full-wave rectifier R, which simultaneously outputs /f pulse-shaped firing signals @gl and ·gl when rlJ signals are input to the circuits AnB to Am@, respectively.
A filter circuit 69 for direct current conversion and noise removal consisting of @ef, a resistor Rf, and a capacitor Cf constitutes a circuit for controlling on/off 7 the thyristors SL to S-. More specifically, the AND circuit AOOe A
The rectangular base pulse signal 1 obtained from the signal source circuit 808 is input to one input terminal of ll to Alm and (JAH1 to All), and the output of the AND circuit All0 is passed through the OR circuit OR to the amplifier Am1. has been entered. AND circuit. . The other input terminal has 7 ritsu!
Flo! The output of the circuit FF• is inputted, and the first detection signal e1 of the overcurrent detection circuit 801 is inputted to the set terminal of the FF•.

Therefore, the first detection signal l is generated and
, when f circuit FF・ is set, AND circuit Ao・ becomes “
This signal is input to the amplifier Am1 through the OR circuit ORo, and the ignition signals GL and GL are outputted from the output circuit P1. These signals are converted into direct current through the filter circuit F1 and passed through the thyristor switch S! thyristors 8CR1 and SCR, respectively.

The outputs 1 to 1 of the tap switching command signal generation circuit 810 controlled by the voltage adjustment relay 809 are input to the other input terminals of the AND circuits A1 to A1, respectively. The tag switching command generation circuit 810 is composed of, for example, a shift register, and responds to the signal from the voltage adjustment relay 809 to select the tap 1. It outputs any one of the signals M1 to M, which instructs to select each of t6 to t6. AND circuit A
The outputs of Il to A1- are each output from flip 70. It is input to the set terminal of the deflop circuit FF, ~FF, and the output of the deflop circuit FF, ~FF is input to the AND circuit aZt.
~A■ is input to one input terminal. The output of the AND circuit AZt is sent to the amplifier A via the OR circuit ORo.
m1, and is also input to the AND circuit As! ~A3・force is inputted to amplifiers Amp~Am@Ic, respectively.

The outputs of the amplifiers A m z~Am@ are connected to the tap t! via the Δrus output circuits P, ~P6 and the filter circuits F, ~FIt-, respectively. ~Thyristor switch IIs selecting t6
It is supplied to the thyristor of ~S6. Mindful OR circuit O
The output of R is AND circuit A3! The outputs of the AND circuits All to AI are respectively supplied to one input terminal of the AND circuits ASS to A3-. The other input terminals of the AND circuits A1 to ASS are connected to the input terminals obtained from the tag current detection circuit 811, respectively.
The detection signal uI"'-u@ is input and the tap current detection circuit 811 receives the outputs of the auxiliary current transformers CTI to CTs provided for ftl % t6 at Rec 4, respectively. By inputting the rectified signal u/, ~U-, which has been rectified and made constant voltage by a constant voltage diode ZD, !t!
The tag current detection signals u1 to U@ are output to the corresponding output terminals of ~ts4C, and when z is selected and current flows through g, the tag current detection circuit 811 outputs the tag current detection signals u1 to u@. Respond to the tap! A current detection signal is output.

The signal u1 that detects that a current has flowed through the 5-powder element/through cod ft1 of these tag current detection signals u1 to u6 is as follows:
It is also supplied to one input terminal of the AND circuit A3, and the output of the AND circuit AOO is supplied to the other input terminal of the AND circuit Aso. In addition, the output of the AND circuit M■ is input to the OR circuit ORx SOR・, and the output of the AND circuit
The output of 1 is input to an OR circuit OR. The output of the AND circuit All is input to the OR circuit OR, and 0RsK, and the output of the AND circuit A, , O is input to the OR circuit OR,
It is input to h. Furthermore, the output of the AND circuit A port is input to the OR circuits OR and OR, the output of the AND circuit All is input to the OR circuits OR4 and OR, respectively, and the output of the AND circuit ASS is input to the OR circuit OR-. . The outputs of the OR circuits OR, ~OR- are respectively free, ! Shiro!
When the signals are supplied to the reset terminals of the circuits FFI to FF-, and the signals in the rlJ state are output from the OR circuits 0RISOR and 7, the outputs of the 7 rip circuits FFI to FF are summed to "0" and the AND circuit A is output. ! The output of l~ASS is “
0". A power-on reset circuit 8 is used to reset the control circuit when the switch 11 is turned on.
12 is provided, and the reset signal obtained from this circuit
, is the tag switching command signal generation circuit 810, and 7 is the deflo! The reset terminal of the circuit FF, and the OR circuit OR, ~
One input terminal of OR- and K are respectively input.

The tap current detection circuit 811 is also configured to output a detection signal 4 for detecting an open gate and a detection signal S for detecting a short circuit between tags each evening. Detection signal 4 #'i is input to the tag open detection circuit 805 IC, and the tap open detection circuit 805 detects the detection signal for all tags. When 4 becomes a value indicating an open state, all tags are disconnected from the power supply. It is designed to output a detection signal indicating that it is in a state where it is being used. Further, the detection signal 6 is input to the tap open detection circuit 813, and the detection signal 6 is inputted to the tap open detection circuit 813. When an accident occurs, the tap open detection circuit 813 outputs a detection signal indicating that a short circuit between tags has occurred. This detection signal is input to the transistor TR through an OR circuit.

Furthermore, the AND circuit AIo + All 'A11l '''
All ”-AN@sOR circuit ORo~OR@, 7s, f20.p circuit FF.

The power for operating each part of the control circuit, such as FF.

Next, we will explain the operation of the above embodiment.1 When the control power switch 11 is closed as shown in FIG. 5(4) at the start of energization,
The power-on reset circuit 812 outputs the reset signal r (see FIG. 5), and this reset signal causes the reset,!
The switching command signal generation circuits 810 and 7, fy, and pull circuits FF.about.FF- are reset. At this time, ta! The switching command value generation circuit 810 outputs a signal M1 instructing to select the clear tap t1,
70. ! Set circuit FFI.

At this time, the AND circuit All outputs a rectangular wave signal, and this signal is input to the amplifier IK through the OR circuit OR. As a result, the thyristor SCR, 8CR of the thyristor switch 81 of the tag t1 is ignited No. 1 and E.
l e-port (see Figure 5B) is given and the thyristor switch S! The preparation for conduction is completed. On the other hand, the turning on of the control power supply switch 11 is detected by the control power supply turn-on detection circuit 803, and this detection circuit provides a pulse-like signal to the transistor TrstC1m through the OR circuit OR.

This is K, so the second transistor Trs becomes conductive, and the relay RYs becomes conductive.
is excited and its firefly Y axis closes. Relay RY4 is energized by the closing of point wing Y, and its contact point RY4.
K] Self-preservation. At this time, the point IY'a1% closes, and the phantom atomizer 7 closes as shown in Figure CK of the irises 5. The d pulse-like output of the above-mentioned closing detection circuit 803 is filtered through the delay circuit 804 and supplied to the transistor TrBK. After the closing of the ninth switch 110, the transistor Try detects closing with a delay of time Tl. The width of the output pulse of the circuit 803 It is conductive for a time corresponding to , and relay RYI operates for a short time.

When the relay RYm OMkA RYs a is closed, the relay IY is mii* and the O41 point BY's is closed, and the point IY'=, o Rousei, the interruption s15 is closed. In addition, the closing of the jealous point RYs causes Shirely RY.

is self-held, and automatic opening/closing tI6 is closed by closing H, of contacts RY', . When the contact point RYlb opens, the relay RY4 is deenergized, so the contact point Y'4. However, the deenergization of the claw coil CC is delayed due to the 7 light wheel diode D, so the automatic switch 7#'i
As shown in Figure C, automatic opening/closing-6 opens after a certain delay time ΔTl has elapsed after closing. At the same time when the automatic switch 7 opens, the thyristor switch S1 of the transparent cod f to which the ignition signal has already been applied, as shown in FIG.
conducts, and current flows through the transparent tag t1. In this way, the thyristor switch S1 becomes conductive immediately, so the thyristor switch S1 becomes conductive immediately. S, ~S s K: #1II
No A-path voltage is applied, and only a small voltage approximately corresponding to the tag-to-tag voltage is applied. ζHere, the delay time ΔT1 and ノT1 are, for example, 7'r5=ΔTz=
Set it to about l (sea).

After the transparent tag is selected and energization is started as described above, if the one-way voltage on the load side decreases (due to an increase in load), the voltage ilI! According to the operation of the 1iIIIi electric appliance 809, the tag switching command signal generation circuit 810 outputs a command signal V, ~, which instructs to appropriately select the boost tap y7'' from ~t-, and the boost tap is switched. t
A firing signal is given to a thyristor switch connected to any one of 1 to t-.

The thyristor switch to which the ignition signal is applied conducts, the thyristor switch is connected, and the current R is applied to the nine taps f/
If it is confirmed by any of the auxiliary current transformers CT, ~CT-) that the ltr has been detected, the tap current detection circuit 811 will give up and correspond to the selected tap, or! A current detection signal is output, and the ignition signal applied to the thyristor switch P and D, which had selected Kj1, disappears.

At this time, the thyristor switch of the previously selected tag is transferred to the blocking layer, and the switching of the tag is completed. is selected, the tap switching command signal generation circuit 810 outputs tag 1. When a signal indicating that ants should be seen is output, the AND of the AND circuit All is established, so ys, fy mouth, ! The circuit FF is set and the AND of the AND circuit Ml is established. Therefore, the amplifier m! A rectangular wave signal is applied to the thyristor switch 8j of the tag t1, and an ignition signal is applied to the thyristor switch 8j of the tag t1, causing the thyristor switch 8mt) #1 to pass. When the thyristor switch sg becomes conductive, a current flows through the tab ltl, so that a detection signal -1 is output from the tap current detection circuit 811, and the AND of the AND circuit M2 is established. This AND circuit 810 rectangular signal a is supplied via OR circuits ORJ and OR to the reset terminals of the differential zero tube circuits FF1 and FFI corresponding to the 1s contact tags t1 and t3.

Chestnut, f-fro! By resetting the circuits FF, , F-1, the output signal of the cyand circuit A11e AHg becomes "0", and the inputs of the amplifiers Am1 and ArmB become "0", so that the thyristor switch SR
The supply of the ignition signal to and Ss is stopped, and the thyristor switch J e 8g becomes cut-off lIK when the anode potential of each thyristor becomes negative with respect to the cathode.

Next, an explanation will be given of the operation when an overcurrent flows due to a short circuit accident on the load side when one of the taps is selected and the load is energized. If this overcurrent exceeds the set value II (for example 500 A) of [1], the second set value 1. (for example 25
If it is less than 00mm), only the first detection signal 凰 is generated from the overcurrent detection circuit 801. At this time, 7s! 7
0. ! Rounding AND circuit where circuit FF is set...
The AND is established, and the through tag amplifier Am1K rectangular wave signal is input through the OR circuit OR. Therefore, the thyristor switch S 凰 conducts, and the tap 1 is passed through.
．． is selected. From this K, tap current detection circuit 811
Since the detection signal u1 is output from the AND circuit A3, the AND operation is established, and the rectangular wave output signal of the AND circuit All passes through the OR circuits OR, .
It is supplied to the reset terminals of circuits FF and FF, respectively. This is f70. f circuits FF and FF are all reset, and regardless of whether tags t or t- are selected, the supply of the ignition signal to the thyristor switch of f is stopped the evening after it is selected. Ru. In this way, when an overcurrent of less than the setting flllx of the irises 2 occurs, switching to the transparent tag is performed unconditionally. In addition, if an overcurrent flows while energizing at f, KF
iThe 11 votes are fixed to the tag.

Next, the second set value 1. If an overcurrent of more than
First and second detection signals 1 from overcurrent detection circuit 801
and e! are output at the same time. In this case, the JIEI detection signal 1 is unconditionally switched to the clear tap t1, as described above.

Today's side? If 11 or more energization R occurs in , the thyristor switch SR becomes conductive as shown in Fig. 6 (double), and after a slight delay lTs in the next layer, the energized tap turns on as shown in Fig. 6 (2). The thyristor switch shuts off.

This delay time ΔT3 is a time corresponding to about 1/2 cycle of the normal power supply voltage. The detection signal of t42 is input to the pace of the transistor Trl via the OR circuit ORx, so the transistor Tr1 becomes conductive, and the relay RY
I is excited. Therefore, contact RYI is closed and contact RY1b is opened. Since the interrupter 5 is currently closed and the auxiliary contacts 52A and 52B are in the closed state VCTo, the contact RY
When I is closed, the pulley 53T is energized, which causes the mechanical opening of the interrupter 5 to be removed and the main contact 51 to be closed.
When the auxiliary contacts 52 and 52B open, the contact RY1b also opens, the relay RYI is deenergized, and the contacts RY and Ry/ open. As a result, the automatic switch 6 of Kuyo 1 opens as shown in FIG. 6(2). Since there is a certain time delay between when the closed coil of the automatic switch is deenergized and when the contacts open, the first automatic switch 6 and interrupter 5 also open after a predetermined time delay.

Time ΔT from when overcurrent occurs until automatic switch 6 opens
4 is approximately 3 cycles of the power supply. When the interrupter 5 interrupts the operation, if it is detected that no current is flowing through the open detection circuit 805, the detection circuit 8
A transistor TrBK@ is supplied from 05 through a delay circuit 806 and an OR circuit OR. As a result, transistor Tr3 becomes conductive, relay RY is energized, and its contacts RY3. closes. At this time, since the contact RY of the relay RY is closed, the relay RY4 is energized, and the relay RY is self-held by the contact RY4a, and the contact RY' is closed. (As shown in the figure, the second automatic switch 7 closes. When the automatic switch 7 closes, if the fault has not been removed, the fault current flows through the switch 7 to the fault point, and the current / It is detected by the overcurrent relay in the unspecified substation, and the substation interrupter opens.

In this case, when the switch 7 closes, the voltage of the control power supply drops extremely due to the accident, but due to the action of the switch 7Fi and the flywheel diode D in its control circuit, the interrupter at the substation Remain closed for a sufficient period of time before opening. The operation after the fault is removed and the substation interrupter is turned on again is the same as the operation at the time of starting energization. Time T
An accident occurs at
In this case, the load is energized through the automatic switch 7 without opening the substation interrupter. In this case, the energization state of the line is 9 as shown in FIG. 6(F')K, and the time ΔT from when the automatic switch 6 opens until the automatic switch 7 closes
s, there is a momentary power outage, but thereafter the load is energized without any problem. In this case, the instantaneous power outage time Δ
Tv,/d is about 0.5 seconds.

Next, the thyristor switch or control circuit may fail due to surge voltage, etc. When a short circuit occurs between T and F, a short circuit detection circuit 813 between T and F outputs a detection signal, and this detection signal is supplied to transistor TRIK via an OR circuit ORx. As a result, the relay RYI is energized, an overcurrent flows, and the second detection signal (■) is generated from the overcurrent detection circuit 801. ! ! 5 opens, then the first automatic switch 6 opens, and then when the opening of the tag is detected, the second automatic switch ft7 closes. In addition, the voltage disconnected from the line -
After repairing the part of the regulator 3Fi that makes noise due to a short circuit between taps, open the control power switch 11 manually and then turn it on again.
is controlled, and the normal operating state is restored in the same way as the operation at the start of energization.

With the configuration as in the above embodiment, when an overcurrent occurs, the tap is unconditionally switched to the through tap, so that it is possible to prevent excessive current from flowing through the thyristor switches and the taps of the taps other than the through tag. Also, when turning on the power, first give an ignition signal continuously to the thyristor switch f, then turn on the second automatic switch, and then turn on the interrupter and ! Since the first automatic switch is turned on and the second automatic switch is opened, the thyristor switch of the transparent tag is necessarily conductive. Therefore, no circuit voltage is applied to the thyristor switches of other taps.

For these reasons, thick thyristors with high withstand voltage and current capacity can only be used for thyristor switches with open taps, and thyristor switches with other taps are often replaced by inexpensive thyristors with low withstand voltage and small current capacity. Can be configured. In addition, the thyristor switch of the bulk tag only needs to withstand an overcurrent for a short period of time after an overcurrent occurs before the interrupter opens, which is not necessary with conventional direct switching automatic voltage regulators. A large capacity thyristor is not required.

As in the above embodiment, if the first automatic switch is provided and pressure is applied to open the automatic switch 1 after the interrupter opens, the automatic switch 1 will activate the load f11 in the event of an accident on the load side.
Since one line can be disconnected, the load can be maintained at 5t-a.
I can do that. Furthermore, if the automatic switch of 1/42 is closed after an overcurrent is detected and the interrupter is opened as in the above embodiment, power can be supplied to the load as is if the fault has been resolved. If the accident is resolved and B is reached, the interrupter can be operated at the IT location.

As mentioned above, when a short circuit between T and F is detected, if the interrupter is first opened and then the first automatic switch is opened, the load 1111 is disconnected from the IIA rectifier transformer path. Since it is possible to prevent the regulating transformer from being reversely energized from other distribution channels connected to the # line, it is possible to prevent the regulating transformer from suffering losses due to short-circuit current flowing through the tag.
It can be prevented.

It is also possible to use an interrupter for the gl and second automatic switches, but since they do not interrupt large currents, a simple switch that does not have the current interrupting function can be used. Also, when the control MS switch 11 is closed, a reset signal is sent from the power-on reset circuit. Of course, the open detection circuit will be reset.

In the above embodiment, the thyristor switch is used as a thyristor switch to continuously give an ignition signal before the interrupter is turned on.
Although K-connected thyristor switches are shown, thyristor switches connected to other taps may be selected depending on the case.

In the above explanation, a single-phase circuit was taken as an example, but a three-phase automatic circuit configured by connecting two regulating transformers in a V connection or three Ill voltage regulators in a three-phase connection is also possible. The present invention can be applied to voltage regulators in exactly the same way.

Further, in the present invention, when an overcurrent is detected or when a short circuit occurs between taps, the interrupter 5 is opened, and then the M
All you have to do is make the automatic switch 6 of l fly! It is optional whether or not to provide the second automatic switch 7.

As described above, according to the present invention, the interrupter is opened when an overcurrent is detected, so the thyristor can be protected from overcurrent, and a thyristor with a small current capacity can be used.・As a result, since a series transformer is not used, the device can be made into a /j\ type and the loss can be reduced, resulting in 1.25iifW! It is possible to provide a static automatic voltage regulator at a low cost by taking advantage of the advantages of a switching voltage regulator.

In addition, in the present invention h, when a short circuit occurs between taps, the interrupter and automatic switch open to disconnect the regulating transformer from the power supply side and load side lines, so that the i# regulating transformer a suffers a #8 loss. can be prevented.

[Brief explanation of the drawing]

Figure 1 (4) is a connection diagram showing an example of the configuration of a conventional static automatic voltage regulator, Figure 1 (B) is a configuration diagram of a thyristor switch, and Figure 2 shows the overall configuration of an embodiment of the present invention. Figure 3 is a schematic diagram showing a single line connection, Figure 3 is a connection diagram showing the main parts of an embodiment of the present invention, Figure 4 is a connection diagram showing an example of the configuration of a control device used in the present invention, and Figure G5 (4 ) to (G) Company Diagram 6 showing the operation when the power is turned on when using the control device shown in Fig. 4
Figures (4) to (g) are diagrams showing operations when overcurrent is detected. l...Substation, 2...Load, 3...Automatic voltage regulator, 4...Line, 5...Interrupter, 7...Automatic switch, 8...Control device .

Claims (1)

[Claims] In the stationary automatic voltage control device comprising a regulating transformer connected to a railway line, and a thyristor switch connected to each tag of the regulating transformer for selecting the next tag, the w
An interrupter inserted in a circuit on the power side of the 41i transformer, an automatic switch inserted in a circuit on the load side of the regulating transformer, and an automatic switch inserted in a circuit on the load side of the regulating transformer, and when an overcurrent is detected and the regulating transformer. and a control device that controls the interrupter and the automatic switch so as to open the interrupter and then open the automatic switch when a short circuit between T and F is detected. Static automatic voltage regulator.