JPH0298675A - Phase checker - Google Patents

Abstract

PURPOSE:To make sure and easy a voltage detection and a phase check by selecting a voltage value and a phase sequence of each power distributing system stored in advance in a memory, calculating and comparing the voltage value and the phase sequence of voltage detection and phase check lead wires and executing the voltage detection and the phase check. CONSTITUTION:A voltage waveform of each phase of a power source side lead wire 40 for connecting a power source side connector 1 and a load side connector 2, and a load side lead wire 50 is detected by a voltage detecting part 10, it is brought to A/D conversion by an A/D converting circuit 31 of an input/output part 30, and its voltage value and phase sequence are calculated by an arithmetic part 20. A calculated value is compared with a voltage value and a phase sequence of a power distributing system selected by a power distributing system selection switch 5 from each interphase voltage value and phase sequence of a three-phase four-wire system, a three-phase three-wire system, a single phase three-wire system, a single phase two-wire system (100V), (200V), etc., stored in advance in a ROM 22, and when they coincide, and when they do not coincide or in case of an open phase, a connection possible display, and a connection change of the connector or a display of an open phase are displayed on a display 33, respectively by a display driver 35 of the input/output part 30.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for supplying power to power receiving customers without power outages during replacement of distribution transformers, work on distribution lead-in lines, etc. When switching the receiving load in parallel to the secondary side of 4 transformer cars, power generation PIIIL, or adjacent pole transformer, parallel switching is performed on the other end of the cable connected to the secondary side of the customer. When doing so, it is necessary to match the phases of each phase of the cable and each phase of the drop-in line receiving power from the power receiving consumer and connect them in parallel.

The phase checker of the present invention allows anyone to easily and accurately carry out phase detection, such as when changing the connection of a currently receiving power load to another power source without interruption. This is about a phase checker that is made to move.

[Conventional technology]

In the past, the above-mentioned replacement of distribution transformers, re-lining of service lines, etc., were usually carried out during power outages.

However, recently, many of the equipment used by consumers has been automated, controlled online, and computerized, making it no longer acceptable to perform power outage operations or even instantaneous power outages.

And in reality, when constructing power distribution lines, etc., four transformer cars and a power generator are used.
It has become possible to use a single vehicle or switch the power load to the secondary side of an adjacent pole transformer, allowing the work to be carried out while supplying power without power outages.

However, in order to perform completely uninterrupted work without instantaneous power outages, it is necessary to switch the power load in parallel to the secondary side of four transformer cars, a power generation car, or an adjacent pole transformer.

When connecting both types of power sources in parallel, phase confirmation is performed by reading the voltage and phase order using a tester or phase detector, and then manually determining the phase order to match the voltage and phase of both power sources. Ta.

However, when human judgment is involved in this way, there are limitations and inconveniences, such as misreading of meters or errors in judgment, and the need for judgment ability.

[Problem to be solved by the invention]

The present invention eliminates such restrictions such as misreading or misjudgment of a meter, or the need for judgment ability, and enables connector connections to be made according to the instructions on the display even without special judgment ability. For example, the present invention provides a phase checker that can easily and reliably perform voltage phase detection.

[Failure to solve the problem]

As shown in Fig. 1, the A phase, B phase, and C phase of the power source side connector 1 and the C phase, b phase, C phase, and C phase of the load side connector 2 are based on the E phase of the power source side connector 1. a resistance voltage divider circuit 3 for each phase voltage, and an open phase detection circuit 4 for the C phase of the load side connector 2.
As shown in FIG. 2, an A/D conversion circuit 31 for the voltage of each phase detected by the voltage detection section 10, a parallel circuit 32, and a display driver circuit 35. and a relay operating circuit 36,
In addition, there is an input/output section 30 consisting of a power distribution system switch 5, a phase detection switch 34, and a display 33, and an A/
A memory 21 that stores the D conversion value, a memory 22 that stores the voltage value and phase order between each phase of each power distribution system, and a memory 22 that calculates the voltage value and phase order between the phases of each connector and stores them in the memory 2.
a calculation section 20 consisting of an arithmetic circuit 23 for calculating and comparing the voltage value and phase sequence of the power distribution method selected by the power distribution method selection switch 5 of No. 2; The voltage waveform of each phase of the side lead wire 40 and the load side lead wire 50 is detected by the voltage detection section ]0, and this is detected by the A/
The D conversion circuit 31 performs A/D conversion, the voltage value and phase order are calculated in the calculation unit 20, and the calculated values are stored in the memory 22 as the voltage value and phase sequence of the power distribution method selected by the power distribution method selection switch 5. If they match, the display driver 35 of the input/output unit 30 displays a message indicating that the connector can be connected or a phase is missing. This is a structure designed to display information.

Note that the memory 22 includes 3-phase 4-wire system, 3-phase 3-wire system, single-phase 3-wire system, single-phase 2-wire system (200V), single-phase 2-wire system (10
0V), etc., for each power distribution method, and when using the power distribution method, select the summary power distribution method using the power distribution method selection switch 5 in the explanatory illustrations shown in FIGS. It is used as a reference for selecting and calling and calculating and comparing.

In FIG. 1, 9 is a voltage dividing resistor. 7 is a connector connection relay, which closes only when the phase detection switch 34 is turned ○N, and connects the B-C phase of the power supply side connector 1 and the a-b- of the load side connector 2.
When detecting the c-C phase partial pressure and otherwise leaving the connector uncharged, it is used for voltage detection phase detection such as 3-phase 3#X type, single-phase 3JIA type, or single MJ2Is type. Safety is ensured by preventing the connector from being charged except when the phase detection switch 34 is closed.

Furthermore, the phase C phase open phase detection relay 8 operates after the above-mentioned connector connection relay 7 operates, and when the load side connector phase C is open, the phase A detection relay 8 of the power supply side connector 1 shown in FIG. The voltage is detected and a display driver 35 displays an indication of C phase open phase on the display 33.

The power supply circuit 19 of the voltage detection unit 10 in FIG.
- Power supply circuit for the phase detection switch 34, display 33, etc.

However, the power supply side connector 1 and the load side connector 2 can either be of the type that can be fitted into and removed from the receptacle of the phase checker main body 6, as shown in FIG. 3, or of the type with leads attached to the main body (not shown). can.

Each connector is color-coded according to phase, and connectors I and
To facilitate identification when changing connections in step 2.

The phase detection switch 34 detects the voltage phase by turning on the switch after connecting each connector 2 to the phase lead wires 40 and 50 to be tested, and displays the display to indicate whether the connection is OK, change the connection, or open phase. 33.

Note that the parallel input/output circuit 32 is connected to the power distribution method selection switch 5
It is a human output section for information between the phase detection switch 34 or the relay operation circuit 36.

[Function] [Example] In order to use the phase checker of the present invention, Fig. 1/tlIJ
In Figure 3, the receptacle 1' of the genuine silk checker body 6 is shown.
- After connecting the power supply side connector 1 and load side connector 2 to 2', respectively, connect them to the power supply side lead wire 40 and the load side lead wire 50.

After the connection, when a voltage is applied between the A phase and E phase of the power supply side connector 1, the initial display ``Phase Checker'' is displayed on the display 33.

After confirming this initial display and pressing the phase detection switch 34,
Set the power distribution method 6J is displayed 8 Turn the power distribution method selection switch 5 to the test phase lead wire 40/50
When the power distribution system is set to, for example, "3-phase 4#X type" and the phase detection switch 34 is pressed, "3-phase 4-wire system J" is displayed on the display 33, and the state becomes possible for voltage detection phase detection.

Next, when the phase detection switch 34 is pressed, if the voltage values and phase order of each phase of the power supply side connector 1 and the load side connector 2 match, the display 33 will show rA-a・B-b-c-cml.
& Possible J is displayed. According to the display, connect each opposing phase of the power side lead wire 40 connected to the power side connector 1 and the load side lead wire 50 connected to the load side connector 2. Once connected, parallel connections can be made without power outages.

However, on the high voltage side of the transformer where the power supply side lead Ji40 and the load side lead wire 50 are connected, each phase is
If the degree is off, in the case of a 3-phase 4-wire system, apply 173v to the A-a and B-b phase openings, and 30v to the C-c phase opening.
Since a potential difference of 0V (when the phase-to-phase voltage is 10OV・200■) is generated, the display 33 shows "A-a-B-b".
・c・c Can connect after power outage" is displayed.

In this case, if the open lines of the displayed phases are connected with live wires, a short circuit will occur due to the potential difference, so if they are connected after a power outage, the phase order can be made to match.

Next, in the case of the 3-phase 4#i1 type, as shown in FIG. 4, the power supply side connector 1 and the load side connector 2 of the phase checker are
In the case of i-connection, when the phase detection switch 34 is pressed, each connector connection relay 7 on the power supply side and the load side and the phase C phase open phase detection relay 8 are activated, and the connection between the power supply side connector 1 and the load side is activated. The connector 2 detects the voltage waveform of each phase of the power supply side lead wire 40 and the load side lead wire 50,
The voltage waveform is divided by the voltage dividing resistor 9 and converted by the A/D conversion circuit 31 of the input/output section 30.
The A/D converted value is stored in the memory 21 of the calculation unit 20, and the voltage value and phase sequence between each connector are calculated by the calculation circuit 23 from this stored value.

The calculated value is compared with the voltage value and phase order of the power distribution system/3-phase 4-wire system stored in advance in the memory 22, and the display driver 35 of the input/output unit 30 displays the connection change display of the connector. , the display 33 shows [Load side a←→e
exchange. " is displayed.

Load side lead wires 50 for C phase and C phase of load side connector 2
By exchanging the connection with , the connection shown in FIG. 5 will be obtained.

Next, when the phase detection switch 34 is pressed, the same voltage detection calculation as above is performed, and the display 33 shows the U power supply side B←→C
exchange. ” message is displayed.

If the B-phase and C-phase connections of the power supply side connector 1 are changed according to this message, the connection shown in FIG. 6 will be obtained.

Next, when the phase detection switch 34 is pressed, the display 33 will show "Load side a-*c→l)-" by a similar voltage detection calculation.
+@ exchange. ” message is displayed.

According to this message, connect the C phase of the load side connector 2 to the C phase of the load side relay rasO to which the C phase is currently connected, and connect the C phase of the load side connector 2 to the load side lead to which the current phase is connected. Connect the B phase of the load side connector 2 to the C phase of the line 50 to the load side IJ to which AL is currently connected.
-1' line 2 is connected to the other phase, respectively, and the connection shown in FIG. 7 is obtained.

Next, when the phase detection switch 34 is pressed, the rA
-a-B-b/c/c connection possible message 4 is displayed, connect the power supply side lead #i40 and load side lead wire 50, where power supply side connector 1 and load side connector 2 are connected, on the phase checker. You can connect according to the following message.

In the above 3-phase 4m circuit, in the case of a phase C phase failure on the load side, the phase C phase failure detection circuit 4 shown in FIG. It is detected, this is calculated by the input/output unit 30 and the calculation circuit 20, and the message "C phase open phase" is displayed on the display 33.
Check and connect the C phase connection of the load side lead wire 50 according to the display.

After that, when you press the phase detection switch 34, the above replacement message will be displayed on the display 33, and according to the display, connect the power supply side or load side connector.
Just change the connections as above.

Next, in the case of a 3-phase 3-wire system, connect the E phase of the power supply side connector 1 shown in Figure 1 to the E phase, which is the ground phase of the power supply side lead m, 40, and then connect the A phase and C phase respectively. , connect the a"e" and C phases of the load-side connector 2 to the load-side lead wires, respectively.

When connected, the initial display 33 will show “Aijifuka” as in the case of the 3-phase 4-wire system.
By setting the required power distribution method using the power distribution method selection switch 5, operating the phase detection switch 34, and changing the connection of the connector according to the replacement message on the day or blur 33,
Similar to the 3-phase 4-wire system, voltage detection and phase detection can be performed.

Next, in the case of single-phase three-wire system, power supply side connector 1
After connecting the E phase of the power supply side lead wire 50 to the E phase of the power supply side lead wire 50,
Connect the phases a, b, and e of the load side connector 2 to the load side lead #150, and change the power distribution system selection switch 5 to the single-phase 3-wire system in the same way as the 3-phase 3-wire system described above. By setting the phase detection switch 34, changing the connection of the connector if necessary according to the message on the display 33, the voltage detection phase can be detected.

Next, even in the case of a single-phase two-wire system, after connecting the E phase and A phase of the power supply side connector 1 to the E phase and A phase of the power supply side lead wire 50, connect the e phase and a phase of the load side connector 2 to the load. Side lead #i5
If you connect it to the e-phase and a-phase of It is possible to perform voltage detection and phase detection in the case of 100V.

〔Effect of the invention〕

As described above, the phase checker of the present invention stores the voltage value and phase order of each power distribution system in advance in the memory 22, selects it as appropriate according to the power distribution system of the phase lead wire to be tested, and selects the voltage value and phase order of each power distribution system in advance. The voltage value detected and calculated from the divided voltage waveform of the voltage test phase lead wire to be tested and the phase order are calculated and compared, and the voltage detection phase between the voltage test phase lead wires to be tested is performed. This can be done easily, reliably, and without waiting, by simply changing the connections of the connectors according to the messages displayed on the display, without causing any misreading or misjudgment of the voltmeter or phase checker. It is possible to perform voltage detection and phase detection without requiring any new elements or the like.

In particular, each power distribution system can be easily adapted to by switching the power distribution system selection switch 5, and since the conventional human judgment part is processed by a computer, the mental burden on the site worker is light.

Furthermore, it has many excellent functions, such as being convenient to carry, since it can be carried anywhere.

[Brief explanation of the drawing]

FIG. 1 is an explanatory circuit diagram of the voltage detection section of the present invention, FIG. 2 is an explanatory block diagram of the input/output section and calculation section of the present invention, FIG. 3 is an illustrative diagram of the external appearance of the present invention, and FIG. 4 ~FIG. 7 is a detailed explanatory diagram of the present invention. 1 is the power supply side connector 2 is the load side connector 1'
2' is a receptacle, 3 is a resistance voltage divider circuit, 4 is an e-phase open phase detection circuit, 5 is a power distribution system selection switch, 6 is a phase checker body, 7 is a connector connection relay 8 is an e-phase open phase detection relay 9 is a voltage dividing resistor, 10 is a voltage detection section, 19 is a power supply circuit 20 is a calculation section, 21 and 22 are memories, 23 is a calculation circuit, 30 is an output section, 31 is an A/D conversion circuit, 32 is a parallel input/output circuit, 33 is a display, 34 is a phase detection switch, 35
is a display driver; 36 is a relay operating circuit; 40 is a lead wire on the power supply side; and 50 is a lead wire on the load side.

Claims (1)

[Claims] Power supply side connector A and power supply side connector A phase based on power supply side connector E phase.
A voltage detection section consisting of a resistive voltage divider circuit for each phase voltage of B/C and load side connectors a, b, c, and e, and an open phase detection circuit for load side connector e phase, and a voltage detection section that detects the voltage detected by the above voltage detection section. An input/output section consisting of an A/D conversion circuit for each phase voltage, a parallel input/output circuit, a display driver circuit, a relay operation circuit, a power distribution method selection switch, a phase detection switch, and a display; A memory that stores the A/D conversion value of , a memory that stores the voltage value and phase order between each phase of each power distribution method, and a memory that calculates the voltage value and phase order between the phases of each connector, and stores this in the memory. It consists of an arithmetic circuit that calculates and compares the voltage values and phase order of the power distribution system, and a calculation unit that compares the voltage values and phase order of the power distribution system. The voltage waveform of is detected by the voltage detection section, A/D converted by the A/D conversion circuit of the input/output section, the voltage value and phase order are calculated by the calculation section, and the calculated value is stored in the memory. Comparison calculations are made with the voltage value and phase order of the selected power distribution method, and if they match, a connectable display is displayed, and if they do not match or there is an open phase, the input/output section A phase checker characterized by a structure that allows it to be displayed on a display.