JP2022076287A - Voltage adjustment device and component replacement method of the voltage adjustment device - Google Patents

Abstract

To provide a voltage adjustment device capable of facilitating an exchange of a component, and a component replacement method of the voltage adjustment device.SOLUTION: A voltage adjustment device (100a) comprising: a series transformer (1); an adjustment transformer (2); measurement transformers (PT1 and PT2); a tap changer (3a); and a control part (4), comprises: a switch (SW1) turning on/off a connection with a primary winding and a distribution line of the adjustment transformer and each measurement transformer; a power supply (41) generating an operation power supply of the control part on the basis of an AC power from each measurement transformer, or comprises: a switch (SW2) turning on/off a connection with a tap of a secondary winding of the adjustment transformer and a tap switching changer; and a switch (SW3) turning on/off the power supply generating the operation power supply of the control part. The tap switching changer includes electromagnetic contact devices (MC_UV and MV_VW) connected in parallel to a connection line connected to the primary winding of the series transformer. In the series transformer, the primary winding is reduced by the tap switch changer or the electromagnetic contactor when the power supply is turned off.SELECTED DRAWING: Figure 1

Description

The present invention relates to a voltage regulator for transforming and adjusting a three-phase AC voltage of a distribution line in a distribution system, and a method for replacing parts of the voltage regulator.

The so-called indirect switching type voltage regulator has a series transformer in which the secondary winding is connected in series with the distribution line, and the primary winding is connected in parallel with the distribution line, and the secondary winding is provided with multiple taps. It is provided with the adjusted transformer and a tap changer for switching the plurality of taps and connecting them to the primary winding of the series transformer (see Patent Document 1).

The tap changer is a changeover switch for switching the tap connected to the primary winding of the series transformer, and a current limiting resistor and a tie-breaking switch that limit the entanglement current flowing between the taps in the process of tap changer. It has a series circuit and an electromagnetic contactor that closes when the operation is stopped and short-circuits the primary winding of the series transformer.

The tap changer switches the magnitude and polarity of the adjustment voltage applied from the adjustment transformer to the primary winding of the series transformer by turning on and off the changeover switch and the entanglement switch in a predetermined sequence. The control unit that controls the on / off of the changeover switch acquires the voltage obtained by stepping down the voltage on the secondary side, which is the load side, from the instrument transformer, and the voltage on the secondary side measured based on the acquired voltage is the reference voltage. Control to approach.

The voltage regulator includes the oil-filled transformer side that houses the series transformer, the regulator transformer, the measuring transformer, and the current limiting resistor, and the control device side that includes the tap switcher excluding the current limiting resistor and the control unit. It is divided into two parts. It is the components included in the controller that need to be replaced during maintenance. In particular, the tap switch has a large number of parts, and it is desired to improve workability during maintenance and replacement.

Japanese Unexamined Patent Publication No. 2018-186598

However, in the voltage adjusting device described in Patent Document 1, no particular consideration has been given to the maintenance and replacement of the components. Hereinafter, the component and the component of the component are referred to as a component.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a voltage regulator for which parts can be easily replaced and a method for replacing parts of the voltage regulator.

The voltage regulator according to one aspect of the present invention includes a series transformer in which a secondary winding is connected in series to a distribution line that distributes a three-phase AC voltage, and a primary winding is connected in parallel to the distribution line. The adjustment transformer, the measuring transformer for measuring the voltage of the distribution line, and the tap of the secondary winding of the adjustment transformer are switched by the changeover switch and connected to the primary winding of the series transformer. A voltage adjusting device including a tap changer and a control unit for controlling the changeover switch to be turned on, and turns on / off the connection between the primary winding of the adjusting transformer and the measuring transformer and the distribution line. The first switch is provided with a power supply unit that generates an operating power supply for the control unit based on the AC power from the measuring transformer, or the tap of the secondary winding of the adjustment transformer and the tap switching. A second switch for turning on / off the connection with the transformer and a third switch for turning on / off the power supply unit for generating the operating power supply of the control unit are provided, and the tap switch is the primary winding of the series transformer. The series transformer has an electromagnetic contactor connected in parallel to an electric circuit connected to a wire, and the primary winding is short-circuited by the tap switch or the electromagnetic contactor when the power supply unit is turned off. ..

In the voltage regulator according to one aspect of the present invention, the tap changer further includes a current transformer for measuring the current flowing in the electric circuit, and the current transformer short-circuits the secondary winding. Including the short circuit part of.

In the voltage adjusting device according to one aspect of the present invention, the current transformer branches from one of the electric circuits and the position on the primary winding side of the series transformer in the one electric circuit, and the electromagnetic wave. A branch electric circuit connected to one end of the contactor is inserted.

The method of exchanging the parts of the voltage adjusting device according to one aspect of the present invention is a method of exchanging the parts of the voltage adjusting device described above, and either turns off the first switch or the third switch and the second switch. The step of turning off the switches in this order, the step of short-circuiting the primary winding of the series transformer by the tap switch or the electromagnetic contactor when the power supply section is turned off, and the step of short-circuiting the change by the short-circuiting section. The step of short-circuiting the secondary winding of the flow device, the step of disconnecting the control unit from the tap switcher and the measuring transformer, the step of exchanging the old and new control units, and the process of exchanging the control unit after replacement are described. The step of connecting to the tap switch and the measuring transformer, the step of canceling the short circuit due to the short circuit portion, and turning on the first switch or switching the second switch and the third switch in this order. It includes a step of turning on and a step of releasing a short circuit of the primary winding of the series transformer by the tap switch or the electromagnetic contactor when the power supply unit is turned on.

The method of exchanging parts of the voltage adjusting device according to one aspect of the present invention is a method of exchanging the parts of the voltage adjusting device described above, wherein the opening and closing of the electromagnetic contactor is monitored by the control unit, and the electromagnetic wave is used. A step of excluding the contactor from the monitoring target of the control unit, a step of putting the tap switch into a state of a through tap that short-circuits the primary winding of the series transformer, and a step of bringing the electromagnetic contactor from the control unit. A step of disconnecting, a step of removing the wiring of the electromagnetic contactor in the tap switcher, a step of exchanging the electromagnetic contactor with another electromagnetic contactor, and a step of replacing the electromagnetic contactor in the tap switcher. The step of connecting the wiring, the step of connecting the replaced electromagnetic contactor to the control unit, the step of including the replaced electromagnetic contactor in the monitoring target of the control unit, and the step of passing the tap switcher through the control unit. It includes a step of returning from the tapped state.

The method for exchanging parts of the voltage adjusting device according to one aspect of the present invention is a method of exchanging parts of the above-mentioned voltage adjusting device, in which the first switch is turned off or the third switch and the second switch are replaced. A step of turning off the switches in this order, a step of short-circuiting the primary winding of the series transformer by the tap switcher and the electromagnetic contactor when the power supply section is turned off, and the change by the short-circuit section. The step of short-circuiting the secondary winding of the flow device, the step of removing the branch electric circuit from one end of the electromagnetic contactor and taking it out from the current transformer, and the step of short-circuiting the branch electric circuit by the other short-circuited portion of the secondary winding. The step of inserting into another short-circuited current transformer and connecting to one end of the electromagnetic contactor, the step of removing the one electric circuit from the tap switcher and taking out the electric circuit from the current transformer, and the one electric circuit. A step of inserting into the other current transformer and connecting the tap switch to a position where the one electric circuit is connected, and a step of disconnecting the secondary winding of the current transformer from the control unit. The step of connecting the secondary winding of the other current transformer to the control unit, the step of canceling the short circuit caused by the other short-circuit portion, and the step of turning on the first switch or the second switch. The step of turning on the third switch in this order and the step of releasing the short circuit of the primary winding of the series transformer by the tap switch and the electromagnetic contactor when the power supply unit is turned on. include.

According to the present invention, parts can be easily replaced.

It is a block diagram which shows the structural example of the voltage adjustment apparatus which concerns on Embodiment 1. FIG. It is explanatory drawing which shows the flow of the signal and electric power which are sent and received between a control part, a tap changer, and an instrument transformer. It is a flowchart which shows the processing procedure which exchanges the control part of the voltage adjustment apparatus which concerns on Embodiment 1. It is a block diagram which shows the structural example of the voltage adjustment apparatus which concerns on Embodiment 2. It is a flowchart which shows the processing procedure which exchanges the control part of the voltage adjustment apparatus which concerns on Embodiment 2. It is a flowchart which shows the processing procedure of exchanging the electromagnetic contactor of the voltage adjustment device which concerns on Embodiment 3. It is a block diagram which shows the structural example of the voltage adjustment apparatus which concerns on Embodiment 4. It is a flowchart which shows the processing procedure of exchanging the current transformer of the voltage regulator which concerns on Embodiment 4. It is a block diagram which shows the structural example of the voltage adjustment apparatus which concerns on Embodiment 5. It is a flowchart which shows the processing procedure of exchanging the current transformer of the voltage adjustment device which concerns on Embodiment 5.

Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments thereof.
(Embodiment 1)
FIG. 1 is a block diagram showing a configuration example of the voltage adjusting device 100a according to the first embodiment. The thyristor type step voltage regulator (TVR) 100a adjusts the AC voltage of the U phase, V phase, and W phase supplied from the electric station on the primary side of the distribution lines 1u, 1v, and 1w. Then, the AC voltage of the u-phase, v-phase, and w-phase is distributed to the load on the secondary side of the distribution wires 1u, 1v, and 1w.

The voltage regulator 100a can be separated / connected to the distribution lines 1u, 1v, 1w by the switches SW11 and SW12 on the primary side and the secondary side of the distribution lines 1u, 1v, 1w, respectively. The detour circuits 10u, 10v, 10w that bypass the switches SW11, SW12 and the voltage regulator 100a can be separated / connected to the distribution lines 1u, 1v, 1w by the switch SW13.

The voltage regulator 100a includes a series transformer 1 in which secondary windings 112, 122, 132 are connected in series to each of the distribution lines 1u, 1v, 1w, and a switch SW1 on the secondary side of the distribution lines 1u, 1v, 1w. It is provided with an adjusting transformer 2 in which the primary windings 211, 211, 231 are Δ-connected via (corresponding to the first switch). The voltage regulator 100a further includes a tap switch 3a provided between the secondary windings 212, 222, 232 of the regulating transformer 2 and the primary windings 111, 121, 131 of the series transformer 1, and the tap. A control unit 4 for issuing a switching command to the switching device 3a is provided.

Measurement transformers PT1 and PT2 for the control unit 4 to measure the line voltage are V-connected to the adjustment transformer 2 side of the switch SW1. The switch SW1 does not have to be a load switch that can be opened and closed in a state where a large load current flows, and is preferably a disconnector, for example.

The secondary windings 212, 222, 232 of the adjusting transformer 2 each have taps t1 and t4 drawn from one end and the other end, and intermediate taps t2 and t3 drawn from between one end and the other end. Have. In each of the secondary windings 212, 222, 232, any one of the taps t1 to t4 has one end of the primary windings 111, 121, 131 of the series transformer 1 and the primary winding 121 via the tap changer 3a. , 131, 111, and another one that is the same as or different from the other one is connected to the neutral point N via the tap changer 3a. The same tap is connected to the neutral point N in the case of a so-called transparent tap in which both ends of the primary windings 111, 121, 131 of the series transformer 1 are short-circuited by the tap changer 3a.

The tap changer 3a includes eight changeover switches Thm_U (m = A, B, C, D, 1, 2, 3, 4) for switching taps t1 to t4 of the secondary winding 212 of the adjustment transformer 2. It has eight changeover switches Thm_V for switching taps t1 to t4 of the secondary winding 222 and eight changeover switches Thm_W for switching taps t1 to t4 of the secondary winding 232. Each selector switch includes, for example, a bidirectionally conducting triac or a pair of thyristors connected in antiparallel.

The tap t1 of the secondary winding 212 is connected to one end of the changeover switches ThA_U and Th1_U via a protective fuse (not shown in FIG. 1; the same applies hereinafter), and the tap t2 is connected to the changeover switch ThB_U and the changeover switch ThB_U via the fuse. It is connected to one end of Th2_U, the tap t3 is connected to one end of the changeover switches ThC_U and Th3_U via a fuse, and the tap t4 is connected to one end of the changeover switches ThD_U and Th4_U. The other ends of the changeover switches ThA_U, ThB_U, ThC_U, and ThD_U are connected to the neutral point N. The other ends of the changeover switches Th1_U, Th2_U, Th3_U, and Th4_U are connected to one end of the primary winding 111 of the series transformer 1 and the other end of the primary winding 121 via the connection line 3u.

The tap t1 of the secondary winding 222 is connected to one end of the changeover switches ThA_V and Th1_V via a fuse, the tap t2 is connected to one end of the changeover switches ThB_V and Th2_V via a fuse, and the tap t3 connects the fuse. The tap t4 is connected to one end of the changeover switches ThD_V and Th4_V, and the tap t4 is connected to one end of the changeover switches ThD_V and Th4_V. The other ends of the changeover switches ThA_V, ThB_V, ThC_V, and ThD_V are connected to the neutral point N. The other ends of the changeover switches Th1_V, Th2_V, Th3_V, and Th4_V are connected to one end of the primary winding 121 of the series transformer 1 and the other end of the primary winding 131 via the connection line 3v.

The tap t1 of the secondary winding 232 is connected to one end of the changeover switches ThA_W and Th1_W via a fuse, the tap t2 is connected to one end of the changeover switches ThB_W and Th2_W via a fuse, and the tap t3 connects the fuse. The tap t4 is connected to one end of the changeover switches ThD_W and Th4_W, and the tap t4 is connected to one end of the changeover switches ThD_W and Th4_W. The other ends of the changeover switches ThA_W, ThB_W, ThC_W, and ThD_W are connected to the neutral point N. The other ends of the changeover switches Th1_W, Th2_W, Th3_W, and Th4_W are connected to one end of the primary winding 131 of the series transformer 1 and the other end of the primary winding 111 via the connection line 3w.

The control unit 4 has a CPU and controls voltage adjustment according to a control program stored in advance in the ROM. Temporarily generated information is stored in RAM (CPU, ROM, RAM are not shown). The control unit 4 includes a drive unit (not shown) that drives each changeover switch on by a drive signal corresponding to a changeover command. The secondary windings of the instrument transformers PT1 and PT2 are connected (not shown) to the control unit 4. Further, the control unit 4 is connected to the secondary windings of the measuring transformers PT3 and PT4 and the current transformers CT_U and CT_W, which will be described later, the entanglement switches ThS_UV and ThS_VW, and the electromagnetic contactors MC_UV and MC_VW ( Both are not shown).

Between the connection lines 3u and 3v, a series circuit of the current limiting resistor R_UV and the entanglement switch ThS_UV, an electromagnetic contactor MC_UV, and a tap changer 3a are used to connect the primary windings 111, 121, 131 of the series transformer 1. A measuring transformer PT3 for measuring the applied voltage by the control unit 4 is connected in parallel. A current transformer CT_U for measuring the current flowing through the connection line 3u by the control unit 4 is coupled between the connection point with the electromagnetic contactor MC_UV in the connection line 3u and the connection point with the convolution switch ThS_UV. are doing. The current transformer CT_U includes a short-circuit connector CN_U (corresponding to a short-circuit portion) for short-circuiting the secondary winding. By attaching, for example, a short-circuit plug S_U to the short-circuit connector CN_U, the secondary winding of the current transformer CT_U is short-circuited.

Between the connection lines 3v and 3w, the series circuit of the convolution switch ThS_VW and the current limiting resistor R_VW, the electromagnetic contactor MC_VW, and the tap changer 3a are used to connect the primary windings 111, 121, 131 of the series transformer 1. A measuring transformer PT4 for measuring the applied voltage by the control unit 4 is connected in parallel. A current transformer CT_W for measuring the current flowing through the connection line 3w by the control unit 4 is coupled between the connection point with the electromagnetic contactor MC_VW on the connection line 3w and the connection point with the convolution switch ThS_VW. are doing. The magnetic contactors MC_UV and MC_VW are preferably mechanical latch type.

The entanglement switches ThS_UV and ThS_VW are used to entangle the taps via the current limiting resistors R_UV and R_VW in the process of switching the taps t1 to t4 of the secondary windings 212, 222, 232, respectively. The control unit 4 is for connecting and disconnecting the current limiting resistors R_UV and R_VW between the taps. The electromagnetic contactors MC_UV and MC_VW are the primary windings 111, 121, of the series transformer 1 when an overcurrent is detected and all the changeover switches are turned off, or when the operation of the tap changer 3a is stopped. The purpose is to short-circuit both ends of the 131 so that it is not opened. The current transformer CT_W includes a short-circuit connector CN_W (corresponding to a short-circuit portion) for short-circuiting the secondary winding. By attaching, for example, a short-circuit plug S_W to the short-circuit connector CN_W, the secondary winding of the current transformer CT_W is short-circuited.

The control unit 4 of the voltage regulator 100a configured as described above acquires the voltage stepped down by the measuring transformers PT1 and PT2 every half cycle of the AC voltage, for example, and obtains the voltages of the distribution lines 1u, 1v, 1w. measure. Further, the control unit 4 issues a switching command based on the measured voltage, and drives each switching switch on by a drive signal corresponding to the switching command. The tap switching device 3a tap-switches to the tap position according to the issued switching command. The circulating current that flows when two taps are bridged during tap switching is limited by the current limiting resistors R_UV and R_VW.

Next, signal lines and power lines not shown in FIG. 1 will be described. FIG. 2 is an explanatory diagram showing a flow of signals and electric power transmitted and received between the control unit 4, the tap changer 3a, and the instrument transformers PT1 and PT2. The thick solid arrow in the figure represents the flow of power. The control unit 4 gives a drive signal for driving the changeover switch Thm_X (m = A, B, C, D, 1, 2, 3, 4; X = U, V, W) on. The control unit 4 acquires an alarm contact signal indicating that the fuse Fn_X (n = 1, 2, 3; X = U, V, W) included in the tap switch 3a is blown. The control unit 4 acquires the voltage stepped down by the measuring transformers PT3 and PT4 from the secondary winding, and the voltage applied by the tap changer 3a to the series transformer 1 based on the acquired voltage, that is, the connection line 3u, Measure the line voltage of 3v and 3w.

The control unit 4 gives an excitation signal to the input coil or the trip coil (open coil) of the electromagnetic contactors MC_UV and MC_VW, and acquires the contact signal of the auxiliary contact from the electromagnetic contactors MC_UV and MC_VW. The control unit 4 acquires the current transformed from the secondary windings of the current transformers CT_U and CT_W, and measures the current flowing through the connection lines 3u, 3v, 3w based on the acquired current. The control unit 4 gives a drive signal for driving the entanglement switches ThS_UV and ThS_VW on.

As described above, the control unit 4 acquires the stepped-down voltage from the secondary windings of the instrument transformers PT1 and PT2. Separately from this, a winding for the operating power supply of the control unit 4 is wound around the measuring transformer PT1 or PT2, and the wiring from this winding is the power supply 41 (to the power supply unit) of the control unit 4. Equivalent) is connected. The power supply 41 generates an operating power supply for the control unit 4 based on the AC power from the instrument transformer PT1 or PT2. The power supply 41 may be outside the control unit 4.

The signal line of the signal transmitted and received between the control unit 4 and the tap switch 3a is wired by, for example, a wire harness. By connecting both ends or one ends of each signal line with a connector, it becomes easy to connect and disconnect the control unit 4 and the components of the tap switch 3a. The same applies to the connection between the control unit 4 and the instrument transformers PT1 and PT2.

Normally, work such as maintenance and inspection and repair related to the voltage adjusting device 100a is performed in a state where the voltage adjusting device 100a is separated from the distribution lines 1u, 1v, 1w. For example, when an operation instructing an operation stop is applied to an operation panel (not shown), the CPU stops the operation of the tap switch 3a and puts it in a through tap state. When the tap changer 3a is in the state of a through tap, the voltage applied to the primary windings 111, 121, 131 of the series transformer 1 becomes substantially 0, and the voltage induced in the secondary windings 112, 122, 132. Is also 0.

After that, for example, the user manually turns on the switch SW13 to connect the detours 10u, 10v, 10w between the primary side and the secondary side of the distribution lines 1u, 1v, 1w. As a result, the distribution path from the electric station on the primary side to the load on the secondary side is substantially detoured to the detours 10u, 10v, 10w. Then, for example, when the user manually opens the switches SW11 and SW12, the voltage adjusting device 100a is disconnected from the distribution lines 1u, 1v, 1w.

The first embodiment proposes a method of exchanging parts of the voltage regulator 100a with at least the series transformer 1 connected to the distribution lines 1u, 1v, 1w. Hereinafter, a method of exchanging the control unit 4 of the voltage adjusting device 100a will be described with reference to a flowchart. FIG. 3 is a flowchart showing a processing procedure for replacing the control unit 4 of the voltage adjusting device 100a according to the first embodiment. A part of the process of FIG. 3 is executed by the CPU included in the control unit 4. The process of FIG. 3 is executed during the operation of the voltage regulator 100a. That is, it is premised that the switch SW11 and SW12 are turned on, the switch SW13 is opened, and the switch SW1 is on. The short-circuit plugs S_U and S_W for the current transformers CT_U and CT_W are not attached to the short-circuit connectors CN_U and CN_W.

When starting the processing procedure of FIG. 3, for example, the user manually turns off the switch SW1 to disconnect the adjusting transformer 2 and the measuring transformers PT1 and PT2 from the distribution lines 1u, 1v, 1w (S11). ..

Here, since the operating power supply of the control unit 4 is generated based on the electric power from the measuring transformer PT1 or PT2, for example, the control unit 4 interrupts the power supply. By this interruption, the CPU of the control unit 4 (hereinafter, simply referred to as CPU) puts the tap changer 3a into a state of a through tap (S12), and further inputs the electromagnetic contactors MC_UV and MC_VW (S13). As a result, the primary windings 111, 121, 131 of the series transformer 1 are short-circuited. The CPU may perform either processing such as putting the tap changer 3a in a through tap state or turning on the electromagnetic contactors MC_UV and MC_VW. In steps S12 and S13, the execution order may be changed.

Even when the power supply of the control unit 4 is lost, the tap switch 3a can maintain the state of the through tap by supplying the operating power supply from the backup power supply, for example. The changeover switch for making a through tap may self-ignite. The magnetic contactors MC_UV and MC_VW are maintained in the closed state as long as they are of the mechanical latch type. When the normally closed magnetic contactors MC_UV and MC_VW are used, the main contact is automatically closed due to the loss of the power supply of the control unit 4.

After that, for example, the user attaches short-circuit plugs S_U and S_W to the short-circuit connectors CN_U and CN_W of the current transformers CT_U and CT_W, respectively, and short-circuits the secondary windings of the current transformers CT_U and CT_W (S15). This prevents overvoltage that occurs when each secondary winding is later disconnected from the control unit 4. Next, for example, the user disconnects the control unit 4 from the tap changer 3a and the measuring transformers PT1 and PT2 (S16), and replaces the separated control unit 4 with a new control unit 4 (S17).

After that, for example, after the user connects the replaced control unit 4 to the tap changer 3a and the measuring transformers PT1 and PT2 (S18), the short-circuit connectors CN_U and CN_W of the current transformers CT_U and CT_W to the short-circuit plug S_U respectively. , S_W is removed to release the short circuit of the secondary winding (S19). Next, the user manually turns on the switch SW1 to connect the adjusting transformer 2 and the measuring transformers PT1 and PT2 to the distribution lines 1u, 1v, 1w (S20).

By connecting the instrument transformers PT1 and PT2 to the distribution lines 1u, 1v, 1w, the supply of AC power to the power supply 41 of the control unit 4 is restarted. After opening the electromagnetic contactors MC_UV and MC_VW in the initialization process (S22), the CPU returns the tap changer 3a from the state of the tap changer to resume operation (S23), and ends the process of FIG. .. The process of step S23 may be executed, for example, when an operation instructing the start of operation is added to the operation panel.

In the first embodiment, all of the control unit 4 is replaced between old and new, but the components of the control unit 4 may be replaced, or all or the components of the tap switch 3a may be replaced. good. Each component is screwed to, for example, a mount (not shown). Specifically, the changeover switch Thm_X (m = A, B, C, D, 1, 2, 3, 4; X = U, V, W), the entanglement switch ThS_UV, ThS_VW, the instrument transformer PT3, The PT4 and the fuse Fn_X (n = 1,2,3; X = U, V, W) can be replaced in step S17 of FIG. However, if the control unit 4 is not replaced, the processes of steps S15 to S19 become unnecessary.

Further, in the first embodiment, the secondary windings 212, 222, 232 of the adjusting transformer 2 are Y-connected via the tap changer 3a, and the primary windings 111, 121, 131 of the series transformer 1 are connected. Although the case where is Δ-connected is described as an example, the present invention is not limited to this. For example, the secondary windings 212, 222, 232 of the adjusting transformer 2 may be Δ-connected via the tap changer, and the primary windings 111, 121, 131 of the series transformer 1 may be Y-connected. Further, the secondary windings 212 and 222 of the adjusting transformer 2 may be V-connected via the tap changer, and the primary windings 111, 121 and 131 of the series transformer 1 may be Y-connected. Even in these cases, the same effect as that of the first embodiment is obtained.

As described above, according to the first embodiment, it is possible to turn on / off the connection between the primary windings of the adjusting transformer 2 and the instrument transformers PT1 and PT2 and the distribution wires 1u, 1v, 1w by the switch SW1. In addition, the power supply 41 generates an operating power supply for the control unit 4 based on the AC power from the measuring transformer PT1 or PT2. By turning off the switch SW1, the operating power supply of the control unit 4 is turned off, and the voltage from each tap of the adjusting transformer 2 to the tap changer 3a becomes 0. When the operating power of the control unit 4 is turned off, the tap changer 3a becomes a through tap state, or the magnetic contactors MC_UV and MC_VW are turned on to turn on the primary windings 111, 121, 131 of the series transformer 1. Is short-circuited. As a result, part or all of the control unit 4 or the tap changer 3a is safely separated from the voltage regulator 100a and reconnected without opening the primary windings 111, 121, 131 of the series transformer 1. be able to. Therefore, the parts can be easily replaced.

Further, according to the first embodiment, the current transformers CT_U, CT_W that detect the current flowing through the connection lines 3u, 3v, 3w connecting the tap changer 3a and the primary windings 111, 121, 131 of the series transformer 1 Each secondary winding can be short-circuited with the short-circuit connectors CN_U and CN_W. Therefore, by short-circuiting the secondary windings with the short-circuit connectors CN_U and CN_W before the current transformers CT_U and CT_W are disconnected from the control unit 4, it is possible to prevent the overvoltage generated in the secondary windings. ..

Further, according to the first embodiment, when the user turns off the switch SW1, the operating power supply of the control unit 4 is turned off, and the voltage from each tap of the adjusting transformer 2 to the tap switch 3a becomes 0. Become. The control unit 4 detects that the operating power is being turned off and puts the tap changer 3a in a through-tap state, or turns on the electromagnetic contactors MC_UV and MC_VW to turn on the primary winding of the series transformer 1. Short the wires 111, 121, 131. After that, the user short-circuits the secondary windings of the current transformers CT_U and CT_W with the short-circuit connectors CN_U and CN_W, and then disconnects the control unit 4 from the tap changer 3a and the measuring transformers PT1 and PT2 for old and new replacement. do. After connecting the replacement control unit 4 to the tap changer 3a and the measuring transformers PT1 and PT2 again, the user releases the short circuit in the short circuit connectors CN_U and CN_W of the current transformers CT_U and CT_W. After that, when the user turns on the switch SW1, the connection between the adjusting transformer 2 and the measuring transformers PT1 and PT2 and the distribution lines 1u, 1v, 1w is restored, and the operating power supply of the control unit 4 is turned on. Turn it on. The control unit 4 returns the tap changer 3a from the state of the tap changer in the initialization process, opens the electromagnetic contactors MC_UV, MC_VW, and cancels the short circuit of the primary windings 111, 121, 131 of the series transformer 1. do. Therefore, the control unit 4 can be safely separated from the voltage regulator 100a and reconnected.

(Embodiment 2)
In the first embodiment, the connection between the adjusting transformer 2 and the measuring transformers PT1 and PT2 and the distribution lines 1u, 1v, 1w is turned on / off by the switch SW1. On the other hand, in the second embodiment, the connection between each tap of the adjusting transformer 2 and the tap changer 3a is turned on / off by the switch SW2 (corresponding to the second switch), and the operating power supply of the control unit 4 is the switch SW3. It is a form that is turned on / off by (corresponding to the third switch). FIG. 4 is a block diagram showing a configuration example of the voltage adjusting device 100b according to the second embodiment.

Each of the taps t1 to t4 of the secondary windings 212, 222, 232 of the adjusting transformer 2 is connected to the tap switch 3a via a different circuit of the switch SW2 having 12 circuits and 2 contacts. In the second embodiment, since the switch SW2 is turned on / off in a state where the load current does not flow, a switch having a smaller switching current than the switch SW1 of the first embodiment can be used.

A switch SW3 for turning on / off the power supply 41 of the control unit 4 is connected between the instrument transformer PT1 or PT2 and the power supply 41 of the control unit 4. The switch SW3 may be connected between a backup power supply (not shown) and the power supply 41, or may be used as a switch for turning on / off the operation of the power supply 41. The primary windings 211,221,231 of the adjusting transformer 2 and the primary windings of the measuring transformers PT1 and PT2 are always connected to the distribution lines 1u, 1v, 1w. Other parts corresponding to the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

Hereinafter, a method of replacing the control unit 4 of the voltage adjusting device 100b will be described with reference to a flowchart. FIG. 5 is a flowchart showing a processing procedure for replacing the control unit 4 of the voltage adjusting device 100b according to the second embodiment. In the processing procedure shown in FIG. 5, among the processing procedures shown in FIG. 3 of the first embodiment, step S11 is replaced with steps S31 and S34, and step S20 is replaced with steps S40 and S41. That is, the procedure for turning off / on the switch SW1 and the procedure for turning off / on the switches SW3 and SW2 are interchanged. Since steps S32, S33, S35 to S39, S42, and S43 in FIG. 5 have the same contents as steps S12, S13, S15 to S19, S22, and S23 in FIG. 3, most of the description is omitted. It is assumed that the switches SW2 and SW3 are on.

When starting the processing procedure of FIG. 5, for example, the user manually turns off the switch SW3 to turn off the operating power supply of the control unit 4 (S31). As a result, the power cutoff interrupt occurs in the control unit 4. By this interruption, the CPU puts the tap changer 3a in the state of a through tap (S32), and further inputs the electromagnetic contactors MC_UV and MC_VW (S33).

Then, for example, the user manually turns off the switch SW2 to disconnect the taps t1 to t4 of the secondary windings 212, 222, 232 of the adjusting transformer 2 from the tap switch 3a (S34). After that, when the user or the CPU executes the processes of steps S35 to S39, the control unit 4 is replaced between old and new as in the first embodiment.

Then, for example, the user manually turns on the switch SW2 to connect the taps t1 to t4 of the secondary windings 212, 222, 232 of the adjusting transformer 2 to the tap switch 3a (S40). Further, the user manually turns on the switch SW3 to turn on the operating power of the control unit 4 (S41). As a result, the supply of AC power to the power supply 41 of the control unit 4 is restarted. After opening the electromagnetic contactors MC_UV and MC_VW in the initialization process (S42), the CPU returns the tap changer 3a from the state of the tap changer to resume operation (S43), and ends the process of FIG. ..

As described above, according to the second embodiment, the switch SW2 can turn on / off the connection between the taps t1 to t4 of the secondary windings 212, 222, 232 of the adjusting transformer 2 and the tap changer 3a. In addition, the power supply 41 that generates the operating power supply of the control unit 4 can be turned on / off by the switch SW3. By turning off the switch SW3 and the switch SW2, the operating power supply of the control unit 4 is turned off, and the voltage from each tap of the adjusting transformer 2 to the tap changer 3a becomes 0. When the operating power of the control unit 4 is turned off, the tap changer 3a becomes a through tap state, or the magnetic contactors MC_UV and MC_VW are turned on to turn on the primary windings 111, 121, 131 of the series transformer 1. Is short-circuited. As a result, part or all of the control unit 4 or the tap changer 3a is safely separated from the voltage regulator 100b and reconnected without opening the primary windings 111, 121, 131 of the series transformer 1. be able to. Therefore, the parts can be easily replaced.

Further, according to the second embodiment, when the user turns off the switches SW3 and SW2, the operating power supply of the control unit 4 is turned off, and the voltage from each tap of the adjusting transformer 2 to the tap switch 3a is applied. It becomes 0. The control unit 4 detects that the operating power is being turned off and puts the tap changer 3a in a through-tap state, or turns on the electromagnetic contactors MC_UV and MC_VW to turn on the primary winding of the series transformer 1. Short the wires 111, 121, 131. After that, after the control unit 4 is replaced between old and new, the user turns on the switch SW2 and the switch SW3, so that the taps t1 to t4 and the tap switch of the secondary windings 212, 222, 232 of the adjustment transformer 2 are turned on. The connection with 3a is restored, and the operating power of the control unit 4 is turned on. The control unit 4 returns the tap changer 3a from the state of the tap changer in the initialization process, opens the electromagnetic contactors MC_UV, MC_VW, and cancels the short circuit of the primary windings 111, 121, 131 of the series transformer 1. do. Therefore, the control unit 4 can be safely separated from the voltage regulator 100b and reconnected.

(Embodiment 3)
While the first and second embodiments are the forms in which the control unit 4 is replaced between old and new, the third embodiment is a form in which the electromagnetic contactors MC_UV and MC_VW are replaced between old and new. In the third embodiment, since the switch SW1 of the first embodiment and the switches SW2 and SW3 of the second embodiment are not used, any of the voltage adjusting devices 100a and 100b may be used.

Hereinafter, a method of exchanging the magnetic contactors MC_UV and MC_VW of the voltage regulator 100a or 100b will be described using a flowchart. FIG. 6 is a flowchart showing a processing procedure for replacing the electromagnetic contactors MC_UV and MC_VW of the voltage regulator 100a or 100b according to the third embodiment.

When starting the processing procedure of FIG. 6, for example, when a specific operation is applied to an operation panel (not shown), the CPU excludes the magnetic contactors MC_UV and MC_VW from the monitoring target of the control unit 4 (S51). In the above, the operation of the tap switch 3a is stopped to be in the state of a through tap (S52). As a result, the primary windings 111, 121, 131 of the series transformer 1 are short-circuited.

After that, for example, the user disconnects the input coil, the trip coil and the auxiliary contact of the magnetic contactors MC_UV and MC_VW from the control unit 4 (S53), and further connects the main contacts of the magnetic contactors MC_UV and MC_VW to the connection lines 3u and 3v. , 3w (S54). In steps S53 and S54, the execution order may be changed. Next, the user replaces the electromagnetic contactors MC_UV and MC_VW separated from the control unit 4 with new magnetic contactors MC_UV and MC_VW (S55). It is preferable that the new magnetic contactors MC_UV and MC_VW here are open.

After that, for example, the user connects the main contacts of the replaced magnetic contactors MC_UV, MC_VW to the connection lines 3U, 3V, 3W (S56), and further connects the respective input coils, trip coils, and auxiliary contacts to the control unit 4. Connect to (S57). In steps S56 and S57, the execution order may be changed. Then, for example, when another specific operation is applied to an operation panel (not shown), the CPU sets the electromagnetic contactors MC_UV and MC_VW as monitoring targets of the control unit 4 (S58), and then the tap switch 3a is set. The operation is resumed by returning from the state of the through tap (S59), and the process of FIG. 6 is completed. If it is not confirmed in step S55 that the new magnetic contactors MC_UV and MC_VW are open, the CPU opens the electromagnetic contactors MC_UV and MC_VW before executing step S58.

As described above, according to the third embodiment, by excluding the electromagnetic contactors MC_UV and MC_VW from the monitoring target of the control unit 4, the removal of the electromagnetic contactors MC_UV and MC_VW is prevented from being detected as an abnormality. After that, the control unit 4 short-circuits the primary windings 111, 121, 131 of the series transformer 1 by putting the tap changer 3a in a through-tap state. Then, the user disconnects the electromagnetic contactors MC_UV and MC_VW from the control unit 4, further removes the wiring for the connection lines 3U, 3V and 3W in the tap changer 3a, and replaces the electromagnetic contactors MC_UV and MC_VW with old and new. After the replaced electromagnetic contactors MC_UV and MC_VW are reconnected to the tap changer 3a and the control unit 4, the electromagnetic contactors MC_UV and MC_VW are returned to the monitoring target of the control unit 4. Finally, the control unit 4 restores the tap switch 3a from the state of the tap and restarts the operation. Therefore, the magnetic contactors MC_UV and MC_VW can be safely separated and reconnected from the voltage regulator 100a or 100b.

(Embodiment 4)
The first embodiment is a mode in which the control unit 4 is replaced between old and new, whereas the embodiment 4 is a mode in which the current transformers CT_U and CT_W are replaced between old and new. FIG. 7 is a block diagram showing a configuration example of the voltage regulator 100c according to the fourth embodiment. The voltage adjusting device 100c has different wiring inserted into each core of the current transformers CT_U and CT_W included in the tap changer 3b as compared with the voltage adjusting device 100a according to the first embodiment.

Specifically, a connection line 3u (corresponding to one electric circuit) is inserted in the core of the current transformer CT_U, and the primary windings 111 and 121 of the series transformer 1 are more than the current transformer CT_U in the connection line 3u. A branch electric circuit 3ub that branches from the side position is further inserted and connected to one end of the electromagnetic contactor MC_UV. Similarly, a connection line 3w (corresponding to one electric circuit) is inserted in the core of the current transformer CT_W, and the primary windings 111 and 131 of the series transformer 1 are closer to the current transformer CT_W in the connection line 3w. A branch electric circuit 3wb that branches from the position of is further inserted and connected to one end of the electromagnetic contactor MC_VW. The other ends of each of MC_UV and MC_VW are connected to the connection line 3v. Other parts corresponding to the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

Hereinafter, a method of exchanging the current transformers CT_U and CT_W of the voltage regulator 100c will be described using a flowchart. FIG. 8 is a flowchart showing a processing procedure for exchanging the current transformers CT_U and CT_W of the voltage regulator 100c according to the fourth embodiment. Of the processing procedures shown in FIG. 8, steps S61 to S65 and steps S72 to S76 are the same as steps S11 to S15 and steps S19 to S23 shown in FIG. 3 of the first embodiment, and thus a part of the description is omitted. ..

When starting the processing procedure of FIG. 8, for example, the user turns off the switch SW1 (S61), the CPU puts the tap changer 3b in a through tap state (S62), and turns on the electromagnetic contactors MC_UV and MC_VW. (S63). Next, the user short-circuits the secondary windings of the current transformers CT_U and CT_W (S65).

After that, for example, the user removes the branch electric circuits 3ub and 3wb from one end of the electromagnetic contactors MC_UV and MC_VW, and further removes them from the cores of the current transformers CT_U and CT_W (S66). The user inserts the taken out branch electric circuits 3ub and 3wb into the cores of the new current transformers CT_UV and CT_VW, and further connects them to one end of the electromagnetic contactors MC_UV and MC_VW (S67). From the start time of step S66 to the end time of step S67, the primary windings 111, 121, 131 of the series transformer 1 are short-circuited by the tap changer 3b.

After that, for example, the user removes the connection lines 3u and 3w from the tap changer 3b, and further removes them from the cores of the current transformers CT_U and CT_W (S68). The user inserts the taken-out connection lines 3u and 3w into the cores of the new current transformers CT_U and CT_W, and further, the original position of the tap changer 3b, that is, the connection lines 3u and 3w removed in step S68 is Connect to the connected position (S69). From the start of step S68 to the end of step S69, the primary windings 111, 121, 131 of the series transformer 1 are short-circuited by the electromagnetic contactors MC_UV, MC_VW. The execution order of steps S66 and 67 and steps S68 and 69 may be interchanged.

After that, for example, the user disconnects the secondary windings of the original current transformers CT_U and CT_W from the control unit 4 (S70), and further connects the secondary windings of the new current transformers CT_U and CT_W to the control unit 4. (S71). Next, after the user releases the short circuit of the secondary windings of the current transformers CT_U and CT_W (S72), the switch SW1 is turned on (S73). As a result, the CPU of the control unit 4 to which the operating power is supplied again opens the electromagnetic contactors MC_UV and MC_VW in the initialization process (S75), and then returns the tap changer 3b from the state of the tap to operate. It resumes (S76) and ends the process of FIG.

As described above, according to the fourth embodiment, of the three connection lines 3u, 3v, 3w connecting the primary windings 111, 121, 131 of the series transformer 1 and the tap changer 3b, the connection lines 3u, 3w Each of them is inserted into the current transformers CT_U and CT_W, and the branch electric circuits 3ub and 3wb branching from the position on the series transformer 1 side of the current transformers CT_U and CT_W in the connection lines 3u and 3w respectively are the current transformers CT_U and 3wb. It is further inserted into CT_W and connected to one end of the electromagnetic contactors MC_UV and MC_VW. As a result, when replacing the current transformers CT_U and CT_W, the connection lines 3u and 3w and the branch electric circuits 3ub and 3wb connected to the tap changer 3b in the through tap state and the electromagnetic contactors MC_UV and MC_VW in the short-circuit state, respectively. By replacing the current transformers CT_U and CT_W before replacement with the current transformers CT_U and CT_W after replacement one by one, the primary windings 111, 121 and 131 of the series transformer 1 can be continuously short-circuited.

Further, according to the fourth embodiment, when the user turns off the switch SW1, the operating power supply of the control unit 4 is turned off, and the voltage from each tap of the adjusting transformer 2 to the tap switch 3b becomes 0. Become. The control unit 4 short-circuits the primary windings 111, 121, 131 of the series transformer 1 by putting the tap changer 3b in the state of a tap changer and turning on the electromagnetic contactors MC_UV and MC_VW. After that, the user short-circuits the secondary windings of the current transformers CT_U and CT_W with the short-circuit connectors CN_U and CN_W, and then inserts them into the current transformers CT_U and CT_W before replacement to one end of the electromagnetic contactors MC_UV and MC_VW. The branch electric circuits 3ub and 3wb connected to the current transformers 3ub and 3wb are removed from one end thereof and taken out from the current transformers CT_U and CT_W. , Connect to one end of MC_VW. During this time, the primary windings 111, 121, 131 of the series transformer 1 are short-circuited by the tap changer 3b. After that, the user removes the connection lines 3u and 3w inserted into the current transformers CT_U and CT_W before replacement and connected to the tap changer 3b from the tap changer 3b and takes them out from the current transformers CT_U and CT_W. The taken-out connection lines 3u and 3w are inserted into new current transformers CT_U and CT_W, respectively, and connected to the original positions of the tap changer 3b. During this time, the primary windings 111, 121, 131 of the series transformer 1 are short-circuited by the electromagnetic contactors MC_UV, MC_VW. Then, after the user reconnects the control unit 4 from the current transformers CT_U and CT_W before replacement to the new current transformers CT_U and CT_W, the short circuit connectors CN_U and CN_W of the new current transformers CT_U and CT_W are short-circuited. unlock. After that, when the user turns on the switch SW1, the connection between the adjusting transformer 2 and the measuring transformers PT1 and PT2 and the distribution lines 1u, 1v, 1w is restored, and the operating power supply of the control unit 4 is turned on. Turn it on. The control unit 4 returns the tap changer 3b from the state of the tap changer in the initialization process, and opens the electromagnetic contactors MC_UV and MC_VW to short-circuit the primary windings 111, 121, 131 of the series transformer 1. To cancel. As a result, the current transformers CT_U and CT_W can be safely separated from the voltage regulator 100c and reconnected.

(Embodiment 5)
In the fourth embodiment, the connection between the adjusting transformer 2 and the measuring transformers PT1 and PT2 and the distribution lines 1u, 1v, 1w is turned on / off by the switch SW1. On the other hand, in the fifth embodiment, the connection between each tap of the adjusting transformer 2 and the tap changer 3b is turned on / off by the switch SW2, and the operating power supply of the control unit 4 is turned on / off by the switch SW3. Is. FIG. 9 is a block diagram showing a configuration example of the voltage adjusting device 100d according to the fifth embodiment.

Each of the taps t1 to t4 of the secondary windings 212, 222, 232 of the adjusting transformer 2 is connected to the tap switch 3b via a different circuit of the switch SW2 having 12 circuits and 2 contacts. A switch SW3 for turning on / off the power supply 41 of the control unit 4 is connected between the instrument transformer PT1 or PT2 and the power supply 41 of the control unit 4. The primary windings 211,221,231 of the adjusting transformer 2 and the primary windings of the measuring transformers PT1 and PT2 are always connected to the distribution lines 1u, 1v, 1w. The same reference numerals are given to the parts corresponding to the other embodiments 1 and 4, and the description thereof will be omitted.

Hereinafter, a method of exchanging the voltage adjusting device 100d will be described with reference to a flowchart. FIG. 10 is a flowchart showing a processing procedure for exchanging the current transformers CT_U and CT_W of the voltage regulator 100d according to the fifth embodiment. In the processing procedure shown in FIG. 10, among the processing procedures shown in FIG. 8 of the fourth embodiment, step S61 is replaced with steps S81 and S84, and step S73 is replaced with steps S93 and S94. That is, the procedure for turning off / on the switch SW1 and the procedure for turning off / on the switches SW3 and SW2 are interchanged. Since steps S82, S83, S85 to S92, S95, and S96 in FIG. 10 have the same contents as steps S62, S63, S65 to S72, S75, and S76 in FIG. 8, most of the description is omitted. It is assumed that the switches SW2 and SW3 are on.

When starting the processing procedure of FIG. 10, for example, the user manually turns off the switch SW3 to turn off the operating power supply of the control unit 4 (S81). As a result, the power cutoff interrupt occurs in the control unit 4. By this interruption, the CPU puts the tap changer 3b in the state of a through tap (S82), and further inputs the electromagnetic contactors MC_UV and MC_VW (S83).

Then, for example, the user manually turns off the switch SW2 to disconnect the taps t1 to t4 of the secondary windings 212, 222, 232 of the adjusting transformer 2 from the tap switch 3b (S84). After that, the current transformers CT_U and CT_W are replaced between old and new as in the fourth embodiment by the user or the CPU executing the processes of steps S85 to S92.

Then, for example, the user manually turns on the switch SW2 to connect the taps t1 to t4 of the secondary windings 212, 222, 232 of the adjusting transformer 2 to the tap switch 3b (S93). Further, the user manually turns on the switch SW3 to turn on the operating power of the control unit 4 (S94). As a result, the supply of AC power to the power supply 41 of the control unit 4 is restarted. The CPU releases the electromagnetic contactors MC_UV and MC_VW in the initialization process (S95), returns the tap changer 3b from the state of the tap changer (S96), restarts the operation, and ends the process of FIG. ..

As described above, according to the fifth embodiment, when the user turns off the switches SW3 and SW2, the operating power supply of the control unit 4 is turned off, and the tap switch 3b from each tap of the adjusting transformer 2 is turned off. The voltage to is 0. The control unit 4 detects that the operating power is being turned off and puts the tap changer 3b in the state of a through tap, or turns on the electromagnetic contactors MC_UV and MC_VW to turn on the primary winding of the series transformer 1. Short the wires 111, 121, 131. After that, after the current transformers CT_U and CT_W are replaced with new ones, the user turns on the switch SW2 and the switch SW3 to turn on the taps t1 to t4 of the secondary windings 212, 222, 232 of the adjusting transformer 2. The connection with the tap switch 3b is restored, and the operating power of the control unit 4 is turned on. The control unit 4 restores the tap changer 3b from the state of the tap changer by the initialization process, and opens the electromagnetic contactors MC_UV and MC_VW to short-circuit the primary windings 111, 121, 131 of the series transformer 1. unlock. Therefore, the current transformers CT_U and CT_W can be safely separated from the voltage regulator 100d and reconnected.

The embodiments disclosed this time should be considered to be exemplary in all respects and not restrictive. The scope of the present invention is indicated by the scope of claims, not the above-mentioned meaning, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims. In addition, the technical features described in each embodiment can be combined with each other.

1u, 1v, 1w distribution line, 10u, 10v, 10w detour, SW11, SW12, SW13 switch, 100a, 100b, 100c, 100d voltage regulator, 1 series transformer, 111, 121, 131 primary winding, 112 , 122,132 Secondary winding, 2 Adjusting transformer, 211,221,231 Primary winding, 212,222,232 Secondary winding, t1, t2, t3, t4 Tap, 3a, 3b Tap switch, 4 Control unit, 41 power supply, Thm_X (m = A, B, C, D, 1, 2, 3, 4; X = U, V, W) selector switch, Fn_X (n = 1, 2, 3; X = U) , V, W) Fuse, 3u, 3v, 3w connection line, ThS_UV, ThS_VW convolution switch, R_UV, R_VW current limiting resistor, MC_UV, MC_VW electromagnetic contactor, CT_U, CT_W current transformer, CN_U, CN_W short circuit connector , S_U, S_W short circuit plug, PT1, PT2, PT3, PT4 measuring transformer

Claims (6)

A series transformer in which the secondary winding is connected in series to the distribution line that distributes the three-phase AC voltage, an adjustment transformer in which the primary winding is connected in parallel to the distribution line, and the voltage of the distribution line. Control to turn on the measurement transformer for measurement, the tap switcher that switches the tap of the secondary winding of the adjustment transformer with the changeover switch and connects it to the primary winding of the series transformer, and the changeover switch. A voltage regulator equipped with a control unit for
The operating power supply of the control unit is based on the AC power from the adjustment transformer, the first switch for turning on / off the connection between the primary winding of the measurement transformer and the distribution line, and the AC power from the measurement transformer. A second switch that includes a power supply unit to generate, or turns on / off the connection between the tap of the secondary winding of the adjusting transformer and the tap switch, and a power supply unit that generates the operating power supply of the control unit. Equipped with a third switch to turn on / off
The tap changer has an electromagnetic contactor connected in parallel to an electric circuit connected to the primary winding of the series transformer.
The series transformer is a voltage regulator in which the primary winding is short-circuited by the tap changer or the electromagnetic contactor when the power supply unit is turned off. The tap changer further includes a current transformer for measuring the current flowing in the electric circuit.
The voltage regulator according to claim 1, wherein the current transformer includes a short-circuit portion for short-circuiting the secondary winding. The current transformer is inserted through one of the electric circuits and a branch electric circuit that branches from the position on the primary winding side of the series transformer in the one electric circuit and connects to one end of the electromagnetic contactor. The voltage regulator according to claim 2. A method of replacing parts of the voltage regulator according to claim 2.
A step of turning off the first switch or turning off the third switch and the second switch in this order.
A step of short-circuiting the primary winding of the series transformer by the tap changer or the electromagnetic contactor when the power supply unit is turned off.
The step of short-circuiting the secondary winding of the current transformer by the short-circuited portion,
The process of disconnecting the control unit from the tap changer and the instrument transformer.
The process of exchanging the old and new control units,
The process of connecting the replacement control unit to the tap changer and the instrument transformer, and
The process of canceling the short circuit caused by the short circuit portion and
A step of turning on the first switch or turning on the second switch and the third switch in this order.
A method for replacing parts of a voltage regulator, which comprises a step of releasing a short circuit of a primary winding of the series transformer by the tap changer or the electromagnetic contactor when the power supply unit is turned on. A method of replacing parts of the voltage regulator according to claim 1.
The opening and closing of the magnetic contactor is monitored by the control unit.
A process of excluding the magnetic contactor from the monitoring target of the control unit,
The process of putting the tap changer into a state of a through tap that short-circuits the primary winding of the series transformer.
The process of disconnecting the magnetic contactor from the control unit,
The process of removing the wiring of the electromagnetic contactor in the tap changer, and
The process of exchanging the old and new magnetic contactors with other magnetic contactors,
The process of connecting the wiring in the tap changer of the electromagnetic contactor after replacement, and
The process of connecting the replaced electromagnetic contactor to the control unit,
The process of including the replaced electromagnetic contactor in the monitoring target of the control unit, and
A method for replacing parts of a voltage regulator, which comprises a step of returning the tap changer from the state of the through tap. A method of replacing parts of the voltage regulator according to claim 3.
A step of turning off the first switch or turning off the third switch and the second switch in this order.
A step of short-circuiting the primary winding of the series transformer by the tap changer and the electromagnetic contactor when the power supply unit is turned off.
The step of short-circuiting the secondary winding of the current transformer by the short-circuited portion,
A step of removing the branch electric circuit from one end of the electromagnetic contactor and taking it out of the current transformer.
A step of inserting the branch electric circuit into another current transformer whose secondary winding is short-circuited by another short-circuited portion and connecting it to one end of the electromagnetic contactor.
The step of removing the one electric circuit from the tap changer and taking it out from the current transformer,
A step of inserting the one electric circuit into the other current transformer and connecting the one electric circuit to the position where the one electric circuit was connected in the tap changer.
The step of disconnecting the secondary winding of the current transformer from the control unit,
The process of connecting the secondary winding of the other current transformer to the control unit,
The process of canceling the short circuit caused by the other short circuit portion and
A step of turning on the first switch or turning on the second switch and the third switch in this order.
A method for replacing parts of a voltage regulator, which comprises a step of releasing a short circuit of a primary winding of the series transformer by the tap changer and the electromagnetic contactor when the power supply unit is turned on.

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