JP7058850B2 - Electrical equipment, short circuit of electrical equipment - Google Patents

Description

The present invention relates to an electric device or the like.

Conventionally, as in Patent Document 1, a load test device including a plurality of resistor groups has been proposed.

Japanese Unexamined Patent Publication No. 2010-25752

However, in order to control the on / off of the power supply to the resistor group, it is necessary to provide many relays (switching members), and the wiring is complicated.

Therefore, an object of the present invention is to provide an electric device or the like capable of on / off control of power supply to a group of resistors without complicating wiring.

The electric device according to the present invention includes a U-phase resistor, a V-phase resistor, a W-phase resistor, and a resistor group having a short-circuit portion. The short-circuited portion short-circuits the U-phase resistor, the V-phase resistor, and the W-phase resistor. The short circuit portion has a three-phase bridge circuit and a relay. The three-phase bridge circuit is connected to a U-phase resistor, a V-phase resistor, and a W-phase resistor on the input side, and is connected to a relay on the output side.

The relay of the short-circuit portion can control the on / off of the power supply to the U-phase resistor, the V-phase resistor, and the W-phase resistor.
Therefore, wiring can be simplified as compared with the form in which three relays are provided.
Further, there is a merit that the problem based on the difference in the response speed of each relay that may occur in the form of using the three relays does not occur.

Preferably, the relay is composed of a semiconductor switch.

When the relay is composed of a semiconductor switch, the response speed can be increased and the durability against high-frequency on / off switching can be increased as compared with the form composed of a mechanical switch or a mechanical relay. Can be done.

More preferably, the electric device is provided with a plurality of resistors. The electric device sends a signal related to on / off control based on the selection switch used to select whether or not to supply power from the power source to be tested to a plurality of resistors and the operation state of the selection switch. It is further provided with a control unit for the operation. The short-circuit unit has a relay control unit that receives a signal related to on / off control from the control unit by wireless communication and performs on / off control of the relay.

When the relay control unit receives the signal related to the on / off control of the relay from the control unit by wireless communication, the signal related to the on / off control is transmitted to the relay via the control signal line wired from the control unit or the like. In comparison, wiring can be simplified.

More preferably, the relay control unit controls relay on / off based on a signal from a mobile terminal that communicates with at least one of the control unit and the relay control unit.

It is possible to control on / off and check the on / off state from a device separate from the electric device.

Further, preferably, the three-phase bridge circuit has a first diode group, a second diode group, and a third diode group in which two diodes or thyristors are arranged in series. The first diode group, the second diode group, and the third diode group are connected in parallel. One end of the first diode group is connected to one end of the relay. The other end of the first diode group is connected to the other end of the relay. The U-phase resistor is connected between two diodes or thyristors in the first diode group. The resistor for V phase is connected between two diodes or thyristors in the second diode group. The U-phase resistor is connected between two diodes or thyristors in the third diode group.

The short-circuit portion according to the present invention includes a three-phase bridge circuit and a relay. The short-circuit portion is provided in a group of resistors provided in the electric device. The three-phase bridge circuit connects the U-phase resistor, the V-phase resistor, and the W-phase resistor that make up the resistor group on the input side, and connects to the relay on the output side. The three-phase bridge circuit short-circuits the U-phase resistor, the V-phase resistor, and the W-phase resistor according to the on / off state of the relay.

As described above, according to the present invention, it is possible to provide an electric device or the like capable of on / off control of power supply to a resistor group without complicating wiring.

It is a perspective view which shows the structure of the load test apparatus in this embodiment. It is a schematic diagram which shows the structure of a load test apparatus. It is a schematic diagram which shows the circuit structure of a resistance part. It is a schematic diagram which shows the circuit structure of a short circuit part. It is a schematic diagram which shows the structure of the operation part. It is a side view of the low pressure load test apparatus using the resistor group including the short circuit part in this embodiment. It is a side view of the high pressure load test apparatus using the resistor group including the short circuit part in this embodiment.

Hereinafter, this embodiment will be described with reference to the drawings.
The embodiment is not limited to the following embodiments. Further, the contents described in one embodiment are applied to other embodiments in the same manner in principle. Moreover, each embodiment and each modification can be combined appropriately.

The load test device (electric device) 1 in the present embodiment includes a cooling fan 10, a resistance section 20, a housing 30, a main switch 50, an operation section 60, and a control section 80, and is a power supply device such as a three-phase alternator. It is used to perform a load test of the power source to be tested (see FIGS. 1 to 7).

(Cooling fan 10)
The cooling fan 10 is a device that sends cooling air to the resistance portion 20, and the resistance portion 20 is arranged above the cooling fan 10.

(Resistance part 20)
The resistance section 20 is formed by arranging a plurality of rod-shaped resistors extending in the horizontal direction at predetermined intervals and providing one or more resistors in series or in parallel, and during a load test. Is supplied with power from the power source to be tested to a part or all of the resistor group.
The resistor is not limited to the one composed of a heating wire, and may be a resistor that can store electric power inside such as a battery.
Further, the resistor may be a water resistor used in the electrolyzer.

In this embodiment, two resistors with a rated capacity of 5 kW (first resistor group G1 and second resistor group G2) and two resistors with a rated capacity of 10 kW are used for a load test of a three-phase AC power supply. An example in which a total of four resistor groups (third resistor group G3, fourth resistor group G4) are provided is shown.

In each resistor group, two resistors (1st resistor R ₁ and 2nd resistor R ₂ ) connected in series for the U phase connected to the R phase terminal of the power supply to be tested, and the power supply to be tested Two resistors ( _3rd resistor R3, 4th resistor _R4 ) connected in series for V-phase connected to the S-phase terminal of, and for W-phase connected to the T-phase terminal of the power supply under test. Two resistors (fifth resistor R ₅ and sixth resistor R ₆ ) connected in series and a short-circuit portion SP are provided.

One terminal of the _second resistor R2 in each resistor group is connected to the U-phase line UB extending from the U _- phase terminal U1 connected to the R-phase terminal of the power supply to be tested, and the fourth resistor _R4 . One terminal is connected to the V-phase line VB extending from the V _- phase terminal V1 connected to the S-phase terminal of the power supply to be tested, and one terminal of the _sixth resistor R6 is the T-phase of the power supply to be tested. It is connected to the W-phase line WB extending from the W _- phase terminal W1 connected to the terminal.

One terminal of the first resistor R1, _one terminal of the _third resistor R3, and one terminal of the _fifth resistor R5 in each resistor group are short-circuited by the short-circuited portion SP (FIG. 3).
The details of the short-circuit portion SP will be described later.

The other terminal of the first resistor _R1 in each resistor group is connected to the other terminal of the _second resistor R2, and the other terminal of the _third resistor R3 is the fourth resistor _R4 . The other terminal of the _fifth resistor R5 is connected to the other terminal of the _sixth resistor R6.

The number of resistors, the rated voltage and capacity of each resistor group, and the number of resistors in the resistor group are not limited to the above configurations.

(Case 30)
The housing 30 is a case that holds the members constituting the load test device 1, such as the cooling fan 10, the resistance unit 20, the main switch 50, the operation unit 60, and the control unit 80, except for the mobile terminal 90 described later. be. An intake port 31 is provided on the lower side surface (upstream) of the cooling fan 10 in the housing 30, and an exhaust port 33 is provided on the upper side (downstream) of the resistance portion 20.

The intake port 31 is provided with an intake lid 32 that opens during use and closes when not in use, and the exhaust port 33 is provided with an exhaust lid 34 that opens during use and closes when not in use.

In the present embodiment, the intake lid 32 and the exhaust lid 34 will be described as having a hinged door, but may have another door structure such as a sliding door.
Further, the intake lid 32 and the exhaust lid 34 may be omitted.

(Short circuit part SP)
The short-circuit section SP includes a three-phase bridge circuit BS, a relay RS, and a relay control section CS.
The short-circuit portion SP has a U-phase resistor (one terminal of the first resistor R ₁ ) and a V-phase resistor (one terminal of the third resistor R ₃ ) according to the on / off state of the relay RS. ) And the W-phase resistor (one terminal of the _fifth resistor R5) are short-circuited.

(Three-phase bridge circuit BS)
The three-phase bridge circuit BS in each resistor group has a U-phase resistor ( _one terminal of the first resistor R1) and a V-phase resistor ( _third resistor R3) on the input side. One terminal) and a W-phase resistor (one terminal of the _fifth resistor R5) are connected, and the relay RS is connected on the output side.

The three-phase bridge circuit BS in each resistor group has a diode group (first diode group D1, second diode group D2, third diode group D3) in which two diodes (or thyristors) are arranged in series (1st diode group D1, 2nd diode group D2, 3rd diode group D3). See FIG. 4).

The first diode group D1, the second diode group D2, and the third diode group D3 are connected in parallel.
The three-phase bridge circuit BS is connected to the relay RS.
That is, one end of the first diode group D1 is connected to one end of the relay RS, and the other end of the first diode group D1 is connected to the other end of the relay RS.
Similarly, one end of the second diode group D2 is connected to one end of the relay RS, and the other end of the second diode group D2 is connected to the other end of the relay RS.
Similarly, one end of the third diode group D3 is connected to one end of the relay RS, and the other end of the third diode group D3 is connected to the other end of the relay RS.

_One terminal of the first resistor R1 is connected between the two diodes or thyristors constituting the first diode group D1.
One terminal of the _third resistor R3 is connected between the two diodes or thyristors constituting the second diode group D2.
One terminal of the _fifth resistor R5 is connected between the two diodes or thyristors constituting the third diode group D3.

(Relay RS)
The relay RS in each resistor group is composed of a semiconductor switch including a semiconductor contact such as an IGBT (Insulated Gate Bipolar Transistor), a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), and a BIPOLAR.
However, the relay RS may be in the form of a mechanical switch or a mechanical relay.

The relay RS is controlled on and off in response to the on / off operation of the first switch S1 to the fourth switch S4, which will be described later, so that a current flows through the corresponding resistor group when the relay RS is in the on state.
Specifically, when the relay RS is turned on, one terminal of the first resistor R1 and _one terminal of the _third resistor R3 and the fifth resistor are passed through the three-phase bridge circuit BS. One terminal of the resistor R5 is short _- circuited, and the corresponding resistor group can be supplied with power from the power supply to be tested.
When the relay RS is turned off, one terminal of the first resistor R1, _one terminal of the _third resistor R3, and one terminal of the _fifth resistor R5 are not short-circuited. , The corresponding resistor group is not supplied with power from the test target power supply.

(Relay control unit CS)
The relay control unit CS in each resistor group is provided close to the relay RS, is connected to the control signal line of the relay RS, and wirelessly communicates with the control unit 80.
The relay control unit CS, which receives a signal from the control unit 80 to turn it on as a signal related to on / off control, turns the relay RS into the on state via the control signal line.
The relay control unit CS, which receives a signal from the control unit 80 to turn it off as a signal related to on / off control, turns the relay RS off via the control signal line.

The wireless communication means for wireless communication performed between the control unit 80 and the relay control unit CS, and between the mobile terminal 90 and the control unit 80 or the relay control unit CS, which will be described later, is, for example, in a state where the wireless communication means is turned on. While it is set to, it sends its own identification information to the outside, and IEEE802.15.1 (Bluetooth (registered trademark)) and IEEE802.11 (wireless LAN) are also conceivable.
Further, infrared communication may be used as the wireless communication means.

However, the operation unit 60 (or control unit 80) and the relay RS in each resistor group are connected by wire, and each relay is connected from the operation unit 60 (or control unit 80) via the control signal line. It may be in the form of transmitting a signal related to on / off control to the RS.
In this case, the relay control unit CS is omitted.

(Main switch 50)
The main switch 50 is composed of a vacuum breaker (VCB: Vacuum Circuit Breaker) or the like, and is connected between the resistance portion 20 and the power supply to be tested (on the U-phase line UB, on the V-phase line VB, and in the W phase). (Provided on the wire WB), the power from the test target power supply is supplied to the resistance unit 20 when it is on, and the power supply from the test target power supply to the resistance unit 20 is stopped when it is in the off state.

(Operation unit 60)
For the operation unit 60, select an on / off operation switch 60a for turning the power of the load test device 1 on and off, and a resistor group for adjusting the load amount (power is supplied from the power supply to be tested). ) Selection switch 60b (first switch S1, second switch S2, third switch S3, fourth switch S4) is provided.

When the main power supply of the load test device 1 is turned on by operating the on / off operation switch 60a, the fan of the cooling fan 10 is based on the power supplied from the drive power supply (auxiliary power supply) of the load test device. Rotates and sends the air taken in from the intake port 31 to the upper resistance portion 20. Further, the control unit 80 operates based on the electric power supplied from the drive power source (auxiliary power source) of the load test device 1.

In addition to the on / off operation switch 60a, an on / off switch for the cooling fan 10 may be provided. In this case, the on / off switch 60a is operated to operate the on / off switch for the cooling fan 10 in a state where the main power supply of the load test device 1 is turned on to rotate the fan of the cooling fan 10. Let's get started.

(Control unit 80)
The control unit 80 is a control device fixed inside the housing 30 that holds the resistance unit 20.
The control unit 80 is a device that controls each unit of the load test device 1, such as the relay RS, the cooling fan 10, and the main switch 50.
The on / off control of the relay RS is performed via the relay control unit CS.
That is, the control unit 80 transmits a signal related to on / off control to the relay control unit CS in each resistor group based on the operation state of the selection switch 60b.

(Relay RS operation procedure)
When the main power supply of the load test apparatus 1 is turned on, the main switch 50 is turned on.
By operating the selection switch 60b (first switch S1 or the like), the resistance portion 20 can be energized.
Specifically, the control unit 80 transmits a signal to turn on the relay control unit CS of the resistor group corresponding to the selection switch 60b selected to be energized.
The relay control unit CS turns on the relay RS connected to the relay control unit CS via the control signal line.
A short circuit is performed via the three-phase bridge circuit BS connected to the relay RS.
As a result, electric power is supplied to the resistor group including the three-phase bridge circuit BS from the test target power supply connected via the main switch 50.

As a specific example, a procedure for supplying electric power when the first switch S1 and the second switch S2 are in the on state and the third switch S3 and the fourth switch S4 are in the off state will be described.

The control unit 80 sends a signal related to on / off control to the relay control unit CS of the first resistor group G1 corresponding to the first switch S1 and the relay control unit CS of the second resistor group G2 corresponding to the second switch S2. , Sends a signal to turn it on.
The relay control unit CS of the first resistor group G1 turns on the relay RS of the first resistor group G1 via the control signal line.
One terminal of the first resistor R1 of the first resistor group G1, _one terminal of the _third resistor R3, and a fifth resistor via the three-phase bridge circuit BS of the first resistor group G1. One terminal of the device R ₅ is short-circuited.
The relay control unit CS of the second resistor group G2 turns on the relay RS of the second resistor group G2 via the control signal line.
One terminal of the first resistor R1 of the second resistor group G2, _one terminal of the _third resistor R3, and the fifth resistor via the three-phase bridge circuit BS of the second resistor group G2. One terminal of the device R ₅ is short-circuited.
Therefore, power is supplied to the first resistor group G1 and the second resistor group G2 from the test target power source connected via the main switch 50.

Further, the control unit 80 relates to on / off control for the relay control unit CS of the third resistor group G3 corresponding to the third switch S3 and the relay control unit CS of the fourth resistor group G4 corresponding to the fourth switch S4. As a signal, a signal to the effect that it is turned off is transmitted.
The relay control unit CS of the third resistor group G3 turns off the relay RS of the third resistor group G3 via the control signal line.
In the third resistor group G3, one terminal of the first resistor R1 of the first resistor group G1 and _one terminal of the _third resistor R3 via the three-phase bridge circuit BS, and the fifth resistor group G3. One terminal of the resistor R5 is not short _- circuited.
The relay control unit CS of the fourth resistor group G4 turns off the relay RS of the fourth resistor group G4 via the control signal line.
In the fourth resistor group G4, one terminal of the first resistor R1 of the first resistor group G1 and _one terminal of the _third resistor R3 via the three-phase bridge circuit BS, and the fifth resistor group G4. One terminal of the resistor R5 is not short _- circuited.
Therefore, power is not supplied to the third resistor group G3 and the fourth resistor group G4 from the test target power supply connected via the main switch 50.

(effect)
In the present embodiment, one relay RS of the short-circuit portion SP can control on / off of power supply to the U-phase resistor, the V-phase resistor, and the W-phase resistor.
Therefore, the three relays (the first relay for controlling the on / off control of the power supply to the U-phase resistor and the second relay for performing the on / off control of the power supply to the V-phase resistor). Wiring can be simplified as compared with the form of providing a relay and a third relay for controlling on / off of power supply to the W-phase resistor.
Further, there is an advantage that a problem (for example, a deviation in power supply timing) based on a difference in response speed of each relay that may occur in the form of using the three relays does not occur.

When the relay RS is composed of a semiconductor switch, the response speed can be increased and the durability against high-frequency on / off switching can be increased as compared with the form composed of a mechanical switch or a mechanical relay. Can be done.

When the relay control unit CS close to the relay RS receives the signal related to the on / off control of the relay RS from the control unit 80 by wireless communication, the signal is routed from the control unit 80 or the operation unit 60 via the control signal line. Wiring can be simplified as compared with the form in which a signal related to on / off control is transmitted to the relay RS.

(Sending to mobile terminals)
On / off control of each resistor group of the load test device 1 may be performed by a portable terminal 90 separate from the load test device 1.
In this case, the mobile terminal 90 wirelessly communicates with the control unit 80 of the load test device 1 or the relay control unit CS of each resistor group.
The mobile terminal 90 transmits a signal related to on / off control of each resistor group, and performs on / off control of the relay RS via the relay control unit CS.
The relay control unit CS of each resistor group transmits information on the on / off state of the relay RS to the mobile terminal 90, and the mobile terminal 90 outputs information on the on / off state of the relay RS to the display device of the mobile terminal 90. do.

This makes it possible to perform on / off control and check the on / off state from a device separate from the load test device 1 such as the mobile terminal 90.

The load test device 1 in the present embodiment can be applied to a low-voltage load test device compatible with a low-voltage power supply as shown in FIG. 6, and can be applied to a high-voltage power supply as shown in FIG. 7. It can also be applied to high-pressure load test equipment.

In addition, in this implementation mobile phone, the configuration of the short-circuit portion SP was explained using the load test device 1.
However, a U-phase resistor (1st resistor R ₁ ), a V-phase resistor (3rd resistor R ₃ ), and a W-phase resistor (5th resistor R ₅ ) are used. It can be applied to other electric devices having a group of resistors having a short-circuited portion SP that short-circuits them. For example, as an electric device, an electric heater or the like can be considered.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and variations thereof are included in the scope of the invention described in the claims and the equivalent scope thereof, as are included in the scope and gist of the invention.

1 Load test equipment (electrical equipment)
10 Cooling fan 20 Resistance part 30 Housing 31 Intake port 32 Intake lid 33 Exhaust port 34 Exhaust lid 50 Main switch 60 Operation unit 60a On / off operation switch 60b Selection switch 80 Control unit 90 Mobile terminal BS Three-phase bridge circuit CS Relay control unit D1 1st resistor group D2 2nd resistor group D3 3rd resistor group G1 1st resistor group G2 2nd resistor group G3 3rd resistor group G4 4th resistor group R ₁ 1st resistor R ₂ 2nd resistor R ₃ 3rd resistor R ₄ 4th resistor R ₅ 5th resistor R ₆ 6th resistor RS relay S1 1st switch S2 2nd switch S3 3rd switch S4 4th switch SP short circuit part U ₁ U phase terminal UB U-phase line V ₁ V-phase terminal VB V-phase line W ₁ W-phase terminal WB W-phase line

Claims (5)

An electric device including a U-phase resistor, a V-phase resistor, a W-phase resistor, and a group of resistors having a short-circuited portion.
The short-circuited portion short-circuits the U-phase resistor, the V-phase resistor, and the W-phase resistor.
The short circuit portion has a three-phase bridge circuit and a relay.
The three-phase bridge circuit is connected to the U-phase resistor, the V-phase resistor, and the W-phase resistor on the input side, and is connected to the relay on the output side.
The electric device is provided with a plurality of the resistor groups.
A selection switch used to select whether or not to supply power to the plurality of resistors, and a selection switch.
Further, a control unit for transmitting a signal related to on / off control based on the operation state of the selection switch is provided.
The short-circuited portion is an electric device having a relay control unit that receives a signal related to the on / off control from the control unit by wireless communication and performs on / off control of the relay. The electric device according to claim 1 , wherein the relay control unit controls on / off of the relay based on a signal from a mobile terminal that communicates with at least one of the control unit and the relay control unit. The three-phase bridge circuit has a first diode group, a second diode group, and a third diode group in which two diodes or thyristors are arranged in series.
The first diode group, the second diode group, and the third diode group are connected in parallel.
One end of the first diode group is connected to one end of the relay.
The other end of the first diode group is connected to the other end of the relay.
The U-phase resistor is connected between two diodes or thyristors in the first diode group.
The resistor for V phase is connected between two diodes or thyristors of the second diode group.
The electric device according to claim 1 or 2 , wherein the U-phase resistor is connected between two diodes or thyristors of the third diode group. The electric device according to any one of claims 1 to 3, wherein the relay is composed of a semiconductor switch. One of claims 1 to 4, wherein power is supplied to the short-circuited portion via the U-phase resistor, the V-phase resistor, and the W-phase resistor. The electrical device described.

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