JP6967384B2 - AC signal generator - Google Patents

Description

The present invention relates to an AC signal generator capable of synchronous operation with a plurality of units.

In general, measuring instruments are periodically calibrated using instruments traceable to international standards in order to ensure the reliability of the values indicated by the instruments. An AC signal generator is known as a device used for this work. As for AC signal generators, those that can construct a calibration system for wattmeters by connecting multiple AC signal generators and operating them synchronously have been put into practical use.

FIG. 9 is a block diagram showing the configuration of a conventional AC signal generator 300. The AC signal generator 300 is a device that outputs an AC voltage or an AC current synchronized with a reference signal according to a setting such as a phase difference. The AC signal generator 300 has a master function and a slave function. When operating as a master, the AC signal generator 300 generates a reference signal and outputs it to the outside, and when operating as a slave, the reference signal is output from the outside. input.

As shown in this figure, the AC signal generator 300 includes an OSC_IN terminal 301, an OSC_OUT terminal 302, a voltage terminal 303, and a current terminal 304 as external terminals. The OSC_IN terminal 301 is a terminal for inputting a reference signal from the outside. The OSC_OUT terminal 302 is a terminal that outputs a reference signal to the outside.

Further, the AC signal generator 300 includes a setting control unit 310, a reference signal generation unit 320, an AC voltage / current generation unit 330, a communication I / F 340, an operation I / F 350, and a changeover switch 360.

The operation I / F 350 accepts input of setting parameters from the user. Further, it is provided with a display, and when an overvoltage or an overcurrent is detected by the AC signal generator 300, the display indicates that fact.

The communication I / F 340 is a general-purpose interface such as USB. Remote control can be performed from an external control device such as a PC via the communication I / F 340. Further, when an overvoltage or an overcurrent is detected by the AC signal generator 300, an interrupt signal can be output to an external control device.

The setting control unit 310 receives setting parameters from the user via the communication I / F 340 and the operation I / F 350, and controls the operation of the reference signal generation unit 320, the AC voltage / current generation unit 330, and the changeover switch 360. Further, when the AC voltage / current generation unit 330 notifies the occurrence of overvoltage or overcurrent, the setting control unit 310 outputs to the outside via the communication I / F340 and the operation I / F350.

The setting parameters received by the setting control unit 310 can include the frequency of the reference signal, the amplitude of the voltage / current, the phase of the voltage / current with respect to the reference signal, ON / OFF of the output, and the like. The frequency of the reference signal is set for the reference signal generation unit 320 when operating as a master, and the amplitude, phase, and output ON / OFF are set for the AC voltage / current generation unit 330.

The reference signal generation unit 320 generates a reference signal having a frequency set by the setting control unit 310. The reference signal is an orthogonal two-phase signal composed of signals I and Q proportional to cos (ωt) and sin (ωt).

The changeover switch 360 switches between the EXT side and the INT side according to the setting of the setting control unit 310. On the INT side, the reference signal output by the reference signal generation unit 320 is guided to the AC voltage / current generation unit 330 and is output from the OSC_OUT terminal 302. On the other hand, on the EXT side, the reference signal input from the OSC_IN terminal 301 is guided to the AC voltage / current generation unit 330, and is output from the OSC_OUT terminal 302.

The setting control unit 310 switches the changeover switch 360 to the INT side when the AC signal generator 300 is operated as the master, and sets the changeover switch 360 to the EXT side when the AC signal generator 300 is operated as the slave. Switch.

The AC voltage / current generation unit 330 inputs a reference signal and outputs either an AC voltage or an AC current with the amplitude and phase φ set by the setting control unit 310. In the case of voltage output, it is output from the voltage terminal 303, and in the case of current output, it is output from the current terminal 304. For the sake of simplicity, the amplitude of the reference signal will be described as 1.

The output voltage and output current are synchronized with the reference signal and are generated in the phase specified with respect to the cos (ωt) of the reference signal. The phase φ signal with respect to the reference signal cos (ωt) is cos (ωt + φ) = cos (ωt), cos (φ) -sin (ωt), sin (φ).
Is calculated as.

Further, the AC voltage / current generation unit 330 can detect the overvoltage and overcurrent of the output signal, and when detected, the output is turned off and the setting control unit 310 is notified. This notification is output to the outside via the communication I / F340 and the operation I / F350.

In the case of AC power generation by the imaginary load method, each phase is composed of a set of two AC signal generators 300 that generate voltage and current. For example, in the case of three-phase AC power generation, a maximum of six AC signal generators 300 can be configured.

FIG. 10 shows a configuration in which six AC signal generators 300 (300a to 300f) generate AC power.

In the example of this figure, the AC signal generator 300a operates as a master, generates and outputs a reference signal, and outputs the voltage of the first phase. The other five operate as slaves, the AC signal generator 300b outputs the current of the first phase, the AC signal generator 300c outputs the voltage of the second phase, and the AC signal generator 300d outputs the current of the second phase. The current is output, the AC signal generator 300e outputs the voltage of the third phase, and the AC signal generator 300f outputs the current of the third phase.

In this case, the OSC_OUT terminal of the AC signal generator 300a operating as a master is connected to the OSC_IN terminal of the AC signal generator 300b in the next stage. Hereinafter, the OSC_OUT terminal and the OSC_IN terminal are connected in order.

Further, the changeover switch 360a of the AC signal generator 300a operating as a master is switched to the INT side, and the output signal is generated by using the cos (ωt) side of the reference signal generated by the reference signal generation unit 320a. The orthogonal two-phase reference signal is output to the outside from the OSC_OUT terminal.

The AC signal generators 300b to f operating as slaves switch the changeover switch 360 to the EXT side, and generate an output signal as an external reference signal. As a result, all the AC signal generators 300 generate the output signal in synchronization with the reference signal generated by the AC signal generator 300a operating as the master.

The operation of the conventional AC signal generator 300 at the time of AC power output will be described. The connection method for generating AC power includes a single-phase two-wire system, a single-phase three-wire system, a three-phase three-wire system (V connection), and a three-phase four-wire system. FIG. 11 shows the number of output phases and the number of required AC generators 300 for each connection method.

The AC signal to be output is specified by frequency (common to voltage and current), phase (or line-to-line) voltage amplitude, line-current amplitude, and phase difference θ between voltage and current of the same phase. The phase difference θ may be specified by lead / delay and power factor (power factor = cos (θ)). Further, the AC signal generator 300 can control the AC voltage / current generation unit 330 output ON / OFF by the setting parameter. Here, a balanced AC signal is targeted.

First, the frequency of the reference signal is set in the AC signal generator 300a that operates as a master. The reference signal generation unit 320a of the AC signal generator 300a supplies the reference signal of the set frequency to the AC voltage / current generation unit 330a of the own device and other AC signal generators 300b to 300f operating as slaves. As a result, all the AC signal generators 320a to 320f are synchronized with the reference signal.

Since a balanced AC signal is assumed, the amplitude of the phase (or line-to-line) voltage of each phase and the amplitude of the line current are the same. The amplitude of the phase (or line) voltage and the amplitude of the line current from the operation I / F 350 (or communication I / F 340) are individually set as the voltage amplitude and the current amplitude in the AC signal generator 300 of each phase.

The voltage and current phases of each phase differ depending on the wiring method. FIG. 12 shows the phases of the voltage and current of each phase for each connection method. In the AC signal generator 300 of each phase, the phase is individually set from the operation I / F350 (or communication I / F340).

In FIG. 12, when the connection method is “three-phase three-wire method (V connection)”, the voltage phase of the second phase is −60 °. This is originally 120 ° if the output of the AC signal generator 300 is connected cyclically, but it is inverted (that is, 180 ° shift) for the purpose of connecting the 0V side of the output terminal of the AC signal generator 300 in common. This is because they are doing. Further, the reason why the current phase is shifted by ± 30 ° with respect to the voltage phase is because of the phase difference between the line voltage and the line current.

When the AC voltage / current generator 330 detects an overvoltage or overcurrent of the output signal, the output of the AC signal generator 330 that detects the abnormality is turned off individually, and the display of the operation I / F 350 has an abnormality. Is displayed. In addition, the communication I / F 340 notifies an external control device such as a PC of the abnormality.

Japanese Unexamined Patent Publication No. 6-132730

In the conventional AC signal generator 300, the user calculates the phase from the reference signal of the voltage / current of each phase from the phase difference θ between the voltage and the current of the AC signal according to the connection method.

For example, when 45 ° is set as θ in the case of three-phase four-wire connection, the current of the first phase is 45 °, the voltage of the second phase is -120 °, and the current of the second phase is -75 °. The voltage of the third phase is −240 °, the current of the third phase is -195 °, and so on.

Then, the calculated phase is set individually for each device. For example, set 45 ° for the AC signal generator 300b, set -120 ° for the AC signal generator 300c, set -75 ° for the AC signal generator 300d, and set the AC signal generator. -240 ° is set for 300e, and -195 ° is set for the AC signal generator 300f. Therefore, the setting work of the user is complicated.

Further, for example, in the case of a single-phase two-wire connection, the phase setting itself may be performed for the AC signal generator 300b, but for the AC signal generator 300c to the AC signal generator 300f that does not output a signal. However, the output signal OFF must be set individually, and the user's setting work is still complicated.

Therefore, an object of the present invention is to simplify the setting work of the user when a plurality of AC signal generators are synchronously operated to generate AC power.

In order to solve the above problems, the AC signal generator of the present invention is an AC signal generator that operates as a master or a slave and generates AC power by synchronously operating a plurality of units. When operating as a master, the current generator, the reference signal generator that generates the reference signal, and the connection method, the frequency of the reference signal, and the phase difference between the voltage and the current are accepted and set. The frequency reference signal is output to the outside, the phase difference between the voltage and current of each phase with respect to the reference signal is calculated according to the set connection method, and the first phase AC signal is generated in synchronization with the reference signal. , The AC voltage generator and the AC current generator generate, and the phase difference between the voltage and current with respect to the reference signal of another phase is transmitted to the slave. When operating as a slave, the reference signal is input from the outside and externally. It is provided with a setting control unit for generating an AC signal according to the phase difference transmitted from the master in synchronization with the reference signal input from the AC voltage generation unit and the AC current generation unit. It is a feature.
Here, the display can be provided, and the setting control unit can display a phase diagram based on the phase difference between the calculated voltage and current of each phase with respect to the reference signal on the display when operating as a master. ..
At this time, when operating as a slave, the setting control unit can display a phase diagram based on the phase difference transmitted from the master on the display.
Further, the setting control unit stops the AC signal generation of all the AC signal generators when an overvoltage or an overcurrent is detected in either the self-AC signal generator or the connected AC signal generator. be able to.
Further, the setting control unit is provided with a UNIT2 connection terminal and a UNIT3 connection terminal, and when operating as a master, the slave connected to the UNIT2 connection terminal has a voltage and a current level with respect to a reference signal of the second phase. The phase difference can be transmitted, and the phase difference between the voltage and the current with respect to the reference signal of the third phase can be transmitted to the slave connected to the UNIT3 connection terminal.
At this time, in the case of the connection method that does not require the third phase, the setting control unit can transmit the stop of AC signal generation to the slave connected to the UNIT3 connection terminal.

According to the present invention, when a plurality of AC signal generators are synchronously operated to generate AC power, it is possible to simplify the setting work of the user.

It is a block diagram which shows the structure of the AC signal generator of this embodiment. It is a figure which shows the structure which generates AC power by three AC signal generators. It is a flowchart explaining operation and operation at the time of AC power output of the AC signal generator which operates as a master. It is a figure explaining the setting screen. It is a figure explaining the setting screen. It is a figure explaining the phase diagram. It is a figure explaining the relationship between the connection system and the necessity of UNIT. It is a flowchart explaining operation and operation at the time of AC power output of the AC signal generator which operates as a slave. It is a block diagram which shows the structure of the conventional AC signal generator. It is a figure which shows the structure which generates AC power by 6 AC signal generators. It is a figure which shows the number of output phases and the number of required AC generators for each connection method. It is a figure which shows the phase of the voltage and the current of each phase for each connection method.

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an AC signal generator 100 of the present embodiment. The AC signal generator 100 is a device that outputs an AC voltage and an AC current synchronized with the reference signal according to the setting. However, it is also possible to output either AC voltage or AC current.

The AC signal generator 100 has a master function and a slave function. When operating as a master, the AC signal generator 100 generates a reference signal and outputs it to the outside, and when operating as a slave, the reference signal is output from the outside. input.

As shown in this figure, the AC signal generator 100 includes an OSC_IN terminal 101, an OSC_OUT terminal 102, a voltage terminal 103, a current terminal 104, a UNIT2 connection terminal 105, and a UNIT3 connection terminal 106 as external terminals.

The OSC_IN terminal 101 is a terminal for inputting a reference signal from the outside. The OSC_OUT terminal 102 is a terminal that outputs a reference signal to the outside. The UNIT2 connection terminal 105 and the UNIT3 connection terminal 106 are communication interfaces for connecting to a slave when operating as a master.

The AC signal generator 100 operating as a master outputs an AC signal of the first phase. Then, another AC signal generator 100 connected to the UNIT2 connection terminal 105 operates as a slave (hereinafter, also referred to as “UNIT2”) that outputs a second-phase AC signal, and another AC signal generator connected to the UNIT3 connection terminal 106. The AC signal generator 100 operates as a slave (hereinafter, also referred to as “UNIT3”) that outputs an AC signal of the third phase. However, depending on the wiring method, the AC signal generator 100 that outputs the second phase and the third phase becomes unnecessary.

The AC signal generator 100 includes a setting control unit 110, a second phase setting control unit 112, a third phase setting control unit 113, a reference signal generation unit 120, an AC voltage generation unit 130, an AC current generation unit 132, and a communication I / F 140. , Operation I / F 150, and changeover switch 160 are provided.

The operation I / F 150 receives input of setting parameters from the user when operating as a master. Further, the operation I / F 150 includes a display 151. The setting parameters that receive input from the user can include the connection method, the frequency of the reference signal, the amplitude of voltage / current, and the phase difference θ of voltage / current.

The communication I / F 140 is a general-purpose interface such as USB. Remote control can be performed from an external control device such as a PC via the communication I / F 140. Further, when operating as a slave, communication is performed by connecting to the UNIT2 connection terminal 105 or the UNIT3 connection terminal 106 of the master.

The setting control unit 110 receives setting parameters via the communication I / F 140 and the operation I / F 150, and controls the operation of the AC voltage generation unit 130, the AC current generation unit 132, and the changeover switch 160. When operating as a master, it further controls the operations of the second phase setting control unit 112, the third phase setting control unit 113, and the reference signal generation unit 120.

The setting control unit 110 includes setting information 111 necessary for controlling the second phase setting control unit 112 and the third phase setting control unit 113. The setting information 111 includes a phase setting rule for each connection method as shown in FIG.

Further, the setting control unit 110 turns off the signal output from its own device when the overvoltage is detected by the AC voltage generation unit 130 and when the overcurrent is detected by the AC current generation unit 132. Then, when operating as a slave, the master is notified via the communication I / F 140. Upon receiving this notification, the master turns off the voltage output and current output of all AC signal generators 100, and outputs that an overvoltage or overcurrent has occurred to the outside via the communication I / F 140 and the display 151. do.

When operating as a master, the second phase setting control unit 112 sets the other AC signal generator 100 connected to the UNIT2 connection terminal 105 to output the second phase AC signal. When operating as a master, the third-phase setting control unit 113 sets the other AC signal generator 100 connected to the UNIT3 connection terminal 106 to output the third-phase AC signal. The functions of the second phase setting control unit 112 and the third phase setting control unit 113 may be included in the setting control unit 110.

The reference signal generation unit 120 generates a reference signal having a frequency set by the setting control unit 110. The reference signal is an orthogonal two-phase signal composed of signals I and Q proportional to cos (ωt) and sin (ωt).

The changeover switch 160 switches between the EXT side and the INT side according to the setting of the setting control unit 110. On the INT side, the reference signal output by the reference signal generation unit 120 is guided to the AC voltage generation unit 130 and the AC current generation unit 132, and is output from the OSC_OUT terminal 102. On the other hand, on the EXT side, the reference signal input from the OSC_IN terminal 101 is guided to the AC voltage generation unit 130 and the AC current generation unit 132, and is output from the OSC_OUT terminal 102.

The setting control unit 110 switches the changeover switch 160 to the INT side when the AC signal generator 100 is operated as a master, and sets the changeover switch 160 to the EXT side when the AC signal generator 100 is operated as a slave. Switch.

The AC voltage generation unit 130 inputs a reference signal, and outputs an AC voltage signal from the voltage terminal 103 with an amplitude set by the setting control unit 110 and a phase φ with respect to the reference signal. The AC voltage generation unit 130 can detect the overvoltage of the output signal, and when the overvoltage is detected, the output is turned off and the setting control unit 110 is notified.

The AC current generation unit 132 inputs a reference signal, and outputs an AC current signal from the current terminal 104 with an amplitude set by the setting control unit 110 and a phase φ with respect to the reference signal. The AC current generation unit 132 can detect the overcurrent of the output signal, and when the overcurrent is detected, the output is turned off and the setting control unit 110 is notified.

Since the AC signal generator 100 of the present embodiment generates AC voltage and AC current for one phase by one unit, for example, in the case of three-phase AC power generation, it is composed of a maximum of three AC signal generators 100. be able to.

FIG. 2 shows a configuration in which three AC signal generators 100 (100a to 100c) generate AC power.

In the example of this figure, the AC signal generator 100a operates as a master, generates and outputs a reference signal, and outputs the voltage and current of the first phase. The other two operate as slaves, the AC signal generator 100b outputs the voltage and current of the second phase, and the AC signal generator 100c outputs the voltage and current of the third phase.

In this case, the OSC_OUT terminal 102a of the AC signal generator 100a operating as a master is connected to the OSC_IN terminal 101b of the AC signal generator 100b of the next stage, and the OSC_OUT terminal 102b of the AC signal generator 100b is connected to the AC signal generator of the next stage. Connect to the OSC_IN terminal 101c of 100c.

The UNIT2 connection terminal 105a of the AC signal generator 100a operating as a master and the communication I / F 140 of the AC signal generator 100b are connected. As a result, the AC signal generator 100b operates as UNIT2. Further, the UNIT3 connection terminal 106a of the AC signal generator 100a and the communication I / F 140 of the AC signal generator 100c are connected. As a result, the AC signal generator 100c operates as UNIT3.

The operation of the AC signal generator 100 of the present embodiment at the time of AC power output will be described. First, the operation of the AC signal generator 100a operating as a master will be described with reference to the flowchart of FIG.

The setting control unit 110a of the AC signal generator 100a operating as a master receives input of setting parameters from the user (S101). To accept the setting parameters, first, the setting screen 200 as shown in FIG. 4 accepts the designation of the connection method. The user can specify the wiring method by selecting from the menu 201, for example. The specified connection method is displayed in the display field 202.

Further, the setting screen 210 as shown in FIG. 5 accepts the settings of the phase (line-to-line) voltage amplitude 211, the line current amplitude 212, the voltage / current phase difference θ213, and the frequency 215. The voltage / current phase difference θ may be accepted by the power factor 214.

The setting screen 200, the setting screen 210, and the like can be displayed on the display 151a. It can also be displayed on a PC or the like connected via the communication I / F 140a.

When the setting control unit 110a receives the setting parameter, the setting control unit 110a displays the phase diagram 216 on the setting screen 210 according to the received content, specifically, the connection method and the voltage / current phase difference θ (S102).

As shown in FIG. 6, the phase diagram differs depending on the connection method, and the phase of the voltage and current of each phase can be confirmed from the phase diagram. The amplitude is represented by a constant length regardless of the actual set value. Here, FIG. 6A is a single-phase two-wire phase diagram, FIG. 6B is a single-phase three-wire phase diagram, and FIG. 6C is a three-phase three-wire diagram. It is a phase diagram of the formula (V connection), and FIG. 6D is a phase diagram of a three-phase four-wire system.

By referring to the setting information 111a including the phase setting rule for each connection method, the setting control unit 110a uniquely sets the phase of the voltage and current of each phase with respect to the reference signal from the connection method and the phase difference θ of the setting parameters. Can be calculated.

Since the setting control unit 110a operates as a master, the changeover switch 160a is switched to the INT side (S103).

Further, the second phase setting control unit 112a transmits the setting parameter to UNIT2 via the UNIT2 connection terminal 105a, and the third phase setting control unit 113a transmits the setting parameter to UNIT3 via the UNIT3 connection terminal 106a.

The setting parameters to be transmitted differ depending on the wiring method. For example, as shown in FIG. 7, since UNIT2 and UNIT3 are unnecessary in the single-phase two-wire system, the output OFF setting parameters are transmitted for UNIT2 and UNIT3. In the case of single-phase three-wire system or three-phase three-wire system, the amplitude of voltage and current and the phase of voltage and current with respect to the reference signal are transmitted as setting parameters to UNIT2, and the output is set to OFF for UNIT3. Communicate parameters. In the case of the three-phase four-wire system, the amplitude of voltage and current and the phase of the voltage and current with respect to the reference signal are transmitted to UNIT2 and UNIT3 as setting parameters.

Then, the AC signal of the first phase is output (S105). When the AC voltage generation unit 130a and the AC current generation unit 132a notify the overvoltage and overcurrent during the output of the AC signal, or when the UNIT2 and UNIT3 notify the overvoltage and overcurrent (S106: Yes). Turns off not only the AC voltage generation unit 130a and the AC current generation unit 132a but also the outputs of UNIT2 and UNIT3 in the interrupt process (S107). This saves the trouble of turning off the output individually. Further, the abnormality is displayed on the display 151a, and the communication I / F 140 notifies the external control device such as a PC of the abnormality (S108).

Next, the operation of the AC signal generator 100 operating as a slave will be described with reference to the flowchart of FIG.

The setting control unit 110 of the AC signal generator 100 operating as a slave receives a setting parameter from the AC signal generator 100a operating as a master (S201). If the received setting parameter is output OFF (S202: Yes), the signal output operation becomes unnecessary.

If the received setting parameter is not output OFF (S202: No), a phase diagram based on the phase of the received voltage and current with respect to the reference signal is displayed on the display 151 (S203). In the case of a slave, a phase diagram for the single phase of the UNIT is displayed.

For example, in the case of single-phase three-wire system UNIT2, V2 and I2 in FIG. 6 (b) are displayed, and in the case of three-phase three-wire system (V connection) UNIT2, V2 in FIG. 6 (c). I2 is displayed, and in the case of a three-phase four-wire system UNIT3, V3 and I3 in FIG. 6D are displayed.

Since the setting control unit 110 operates as a slave, the changeover switch 160 is switched to the EXT side (S204).

Then, the AC signals of the second phase and the third phase are output (S205). When an overvoltage or overcurrent notification is received from the AC voltage generation unit 130 and the AC current generation unit 132 during the output of the AC signal (S206: Yes), the AC voltage generation unit 130 and the AC current generation unit 132 are interrupted. Output is turned off (S207). Further, the master is notified of the overvoltage and the overcurrent (S208).

As described above, according to the AC signal generator 100 of the present embodiment, when the connection method and the phase difference between voltage and current are set in the AC signal generator 100 operating as a master, the voltage and current are connected to each slave. Since the phase difference with respect to the reference signal is set, it is possible to simplify the setting work of the user when a plurality of AC signal generators are operated synchronously to generate AC power.

Moreover, since the phase diagram is displayed on the master, the entire image of the AC signal generation can be easily confirmed. Since the single-phase phase diagram is displayed on the slave, the signal of each phase becomes clear and erroneous wiring can be prevented.

Further, even if an overvoltage or an overcurrent occurs in any of the AC signal generators 100, the signal outputs of all the AC signal generators 100 are turned off, which reduces the user's trouble when an abnormality occurs. be able to.

Further, since the AC signal generator 100 has both a master function and a slave function, the flexibility of the device configuration is improved.

100 ... AC signal generator, 101 ... OSC_IN terminal, 102 ... OSC_OUT terminal, 103 ... Voltage terminal, 104 ... Current terminal, 105 ... UNIT2 connection terminal, 106 ... UNIT3 connection terminal, 110 ... Setting control unit, 111 ... Setting information, 112 ... Phase 2 setting control unit, 113 ... Phase 3 setting control unit, 120 ... Reference signal generation unit, 130 ... AC voltage generation unit, 132 ... AC current generation unit, 140 ... Communication I / F, 150 ... Operation I / F, 151 ... Display, 160 ... Changeover switch

Claims (6)

An AC signal generator that operates as a master or slave and generates AC power by synchronous operation with multiple units.
AC voltage generator and
AC current generator and
The reference signal generator that generates the reference signal and the reference signal generator
When operating as a master
Accepts the setting of the connection method, the frequency of the reference signal, and the phase difference between the voltage and current.
Outputs the reference signal of the set frequency to the outside,
Calculate the phase difference between the voltage and current of each phase with respect to the reference signal according to the set wiring method.
Synchronized with the reference signal generated by the reference signal generation unit , a first phase AC signal is generated in the AC voltage generation unit and the AC current generation unit.
The phase difference between voltage and current with respect to the reference signal of the other phase is transmitted to the slave,
When operating as a slave
Input the reference signal from the outside and
A setting control unit that generates an AC signal according to the phase difference transmitted from the master in synchronization with the reference signal input from the outside to the AC voltage generation unit and the AC current generation unit.
An AC signal generator characterized by being equipped with. Equipped with a display
The first aspect of the present invention, wherein the setting control unit displays a phase diagram based on the phase difference between the calculated voltage and current of each phase with respect to the reference signal on the display when operating as a master. AC signal generator. The AC signal generator according to claim 2, wherein the setting control unit displays a phase diagram based on a phase difference transmitted from the master on the display when operating as a slave. When the setting control unit operates as a master,
If an overvoltage or overcurrent is detected in either the self-AC signal generator or the AC signal generator connected to the self-AC signal generator, all AC signal generators including the self-AC signal generator The AC signal generator according to any one of claims 1 to 3, wherein the AC signal generation is stopped. It is equipped with a UNIT2 connection terminal and a UNIT3 connection terminal.
The setting control unit
When operating as a master, the phase difference between voltage and current with respect to the reference signal of the second phase is transmitted to the slave connected to the UNIT2 connection terminal, and the third phase is transmitted to the slave connected to the UNIT3 connection terminal. The AC signal generator according to any one of claims 1 to 4, wherein the phase difference between a voltage and a current with respect to a reference signal is transmitted. The setting control unit
The AC signal generator according to claim 5, wherein in the case of a connection method that does not require a third phase, the stop of AC signal generation is transmitted to the slave connected to the UNIT3 connection terminal.

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