JPH0515286B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to power distribution lines, when construction work such as replacing an existing pole-mounted transformer, or installing or relocating a new utility pole is carried out without interruption. The purpose of the mobile transformer is to automatically check whether the phases match or not when the mobile transformer and the existing distribution line in the construction zone are connected in parallel, and to detect mismatches. In this case, the present invention aims to provide a phase detection method and a phase detection device for a mobile transformer, which automatically detects and displays the phase to be changed, so that cable phase connection changes can be performed quickly and reliably. be.

[Conventional technology] In recent years, we have entered the high-tech era, and with the spread of advanced industrial equipment such as computers and the advancement of lifestyles due to the introduction of a variety of high-performance home appliances, the dependence on electricity in today's social life has increased. Social awareness of power outages, whether due to construction work or malfunctions, is becoming more and more extreme, and even momentary power outages cannot be tolerated. In response to the social needs mentioned above, recently, bypass cable cars and mobile transformer cars have been used to carry out construction work while continuing to supply customers without power outages in order to avoid power outages. An uninterruptible construction method has been developed that allows this, and today this uninterruptible construction method is being adopted.

The mobile transformer vehicle used in the above-mentioned uninterruptible construction method generally has a high-voltage transformer with a current-limiting fuse on its primary side, including the mobile transformer 1, as shown in Figure 5, in the outer box mounted on the vehicle. The switch 2 is connected, and the secondary side accommodates a wiring sheath disconnector 3 and a switch 4 for voltage detection and phase detection connected in parallel, and connected to the high voltage switch 2 on the outside of the outer box. It is constructed by mounting a low voltage cable 6 connected to the bypass cable 5 and the secondary side of the mobile transformer 1 via a wiring sheath disconnector 3.

When using the mobile transformer 1, the bypass cable 5 of the mobile transformer 1 is connected to a bypass cable loaded on a bypass cable car (not shown), the cable is connected to a healthy section outside the construction zone, and the low voltage cable 6 of the mobile transformer 1 is connected to the bypass cable 5 of the mobile transformer 1. The line was connected to the low-voltage distribution line in the construction zone to continue supplying customers without interruption, and the line switch was opened to ensure that the construction zone was completely voltage-free. . In this way, when the mobile transformer 1 continues supplying to consumers within the construction zone, the phase connection between the mobile transformer 1 and the distribution line on the consumer side is properly performed prior to supply. It was necessary to confirm this through a phase examination. In other words, if the secondary side of the mobile transformer 1 and the corresponding phase of the distribution line do not match between the two poles of the wiring sheath disconnector 3 due to a connection error, a short circuit failure will occur on the customer side. etc.,
This will not only disrupt supply, but also lead to damage to equipment, causing a great deal of inconvenience to customers.

[Problems to be Solved by the Invention] Therefore, when confirming the phase connection between the secondary side of a conventional mobile transformer and a distribution line, for example, as shown in FIG. After opening , turn on the voltage detection and phase detection switch 4 to the contact T side. When the switch 4 is turned on, the indicator lights shown in Fig. 5, B phase (blue cable), K phase (black cable), R phase (red cable), and N phase (green cable), all light up.
The connection between mobile transformer 1 and the healthy section is normal,
This indicates that power is being supplied to the secondary side of the mobile transformer 1. If some of the indicator lights do not light up, the indicator light may be disconnected, the cable is incorrectly connected, or the high voltage switch 2 It is possible that you forgot to put it in, so please check these again and switch
is applied to the contact T side again, and it is confirmed whether the mobile transformer 1 is being supplied from the healthy section.

Next, when testing the phase to see if the phase connection between the secondary side of the mobile transformer 1 and the customer-side distribution line is correctly performed, switch the voltage detection and phase detection switch 4 to the 5th switch.
In the figure, the contact is connected to the S side. At this time, if the connections of each phase are normal, the secondary side of mobile transformer 1 and each phase of the corresponding distribution line are at the same potential, so indicator lights B, K, R, and N will light up. do not. However, when a phase connection is incorrect, a potential difference occurs between the corresponding phases, which causes an indicator light at the location where the connection seems to be incorrect to light up.
Now, for example, when indicator lights B and K light up, B,
Although it can be determined that the connection of the K phase is incorrect by the illumination of the indicator lights B and K, the indicator lights B and K are connected to which phase cable of the customer side power distribution line (not shown) is connected to the B or K phase cable. I have no idea if it's lit or not. That is, conventionally, when performing phase detection work on the secondary side of the mobile transformer 1, indicator lights B, K, R,
Although it is possible to determine that there is a mistake in the phase connection based on which of the N indicator lights are not lit and which are lit, it is not possible to connect the cable of the incorrect phase to the corresponding customer. There are no specific indications as to which phase cable of the side distribution line should be connected. For this reason, once the phase detection switch 4 is
was opened, and the phase connections were changed by checking the instruction items of the illuminated indicator light B based on the instructions and the like. The conventional phase inspection work described above has the following problems.

(1) When an indicator light indicating a phase detection failure lights up, the worker should check the instructions, etc. to determine which phase cable should be connected to the phase cable of the indicator light that is lit, and then connect the cable. The work was very time consuming and troublesome as it required replacement work. In particular, when multiple indicator lights were lit, it was necessary to carefully recognize the phase of the lit indicator lights and change the multiple phase connections, which easily caused confusion in the process of succession, and caused confusion when connecting similar connections. Work and phase inspection operations were often repeated over and over again, resulting in very poor work efficiency.

(2) Since the wiring shield and disconnector 3 is not particularly equipped with an interlock function, it may be accidentally turned on during phase detection, or it may be mistakenly detected that a part of the indicator light is disconnected. There were problems with operational functions and safety, such as the possibility of causing a great deal of inconvenience to customers if the product was determined to be "good" and was introduced.

(3) Furthermore, if some phase connections are disconnected or the phase connections are incorrect during phase inspection, all the indicator lights for the relevant phase will be off, so it will be said that the phase inspection is good. Simply making a judgment and using a wiring switch or disconnector 3 may cause a lot of inconvenience to customers. Moreover, if the indicator light lights up, there is a mistake in the connection of the lit phase, so change the phase connections, turn on the phase detection switch 4 again, and check the lighting status of the indicator light to make sure the phase connection is correct. The above-mentioned phase connection change work, especially in the case of three-phase, is performed based on instructions, etc., but as the number of connection changes increases, it will be difficult to However, in many cases, the same connection changes are repeated over and over again, making the phase verification work slow. There was a problem that phase inspection work took a long time.

As explained above, in conventional phase inspection work, phase inspection was judged as "good" or "fail" based only on whether the indicator light was on or not, which made the phase inspection work more efficient. There was a problem where it could not be done properly and safely.

In view of the above-mentioned problems, the present invention detects mismatched phase connections during phase inspection work, and uses the detection signal to determine which phase the mismatched phase connections should be replaced with. A phase detection method and phase detection method for a mobile transformer that allows phase connection changes to be quickly, easily, and safely and reliably performed by displaying whether the current status is normal and performing connection change operations according to the displayed contents. The purpose is to provide equipment.

[Means and effects for solving the problem] In order to achieve the above-mentioned object, the present invention provides the following features when the secondary side of a mobile transformer and a low voltage distribution line are connected in phase,
a detection circuit for detecting the potential difference between the two; a microcomputer (hereinafter referred to as microcomputer) that performs necessary sequence control based on the input signal from the detection circuit and outputs a signal of the phase detection result;
A display circuit that displays the required phase detection result using the output signal from the microcomputer, and if the phase detection result is good,
This is a phase detection device equipped with a wiring circuit and an interlock circuit to release the locked state of the disconnector.If the phase connection between the mobile transformer and the low-voltage distribution line is good, the signal will be detected. Output from the microcomputer to the display circuit and interlock circuit indicates "phase detection good"
In addition to lighting up the indicator light, the interlock circuit of the wiring shield disconnector is opened to enable automatic closing of the shield disconnector, and if the phase connections do not match, the cables of the unmatched phase are connected. A signal instructing connection change is output from the microcomputer and displayed, and by changing the cable connection according to the displayed instructions, the correct phase connection can be quickly and easily made, and connections can be changed. During this period, an interlock circuit prevents the wiring switch or disconnector from being turned on, thereby preventing unexpected accidents on the customer side.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4 of the accompanying drawings.

FIG. 2 shows a schematic configuration of a mobile transformer equipped with a phase detection device of the present invention, and FIG. 3 shows its wiring diagram.

In FIGS. 2 and 3, 11 is a mobile transformer vehicle, 12 is a mobile transformer mounted on the vehicle 11, and in this example, the pole transformer Tr ₁ ,
It is provided so that up to two banks of Tr ₂ can be connected in parallel. Reference numeral 13 indicates a ground phase switching switch connected to the secondary side of the mobile transformer 12 which is V-connected to accommodate two banks, and 14a and 14b are connected to the secondary side of the mobile transformer 12 to accommodate two banks. 15 is a non-voltage tap changer of the mobile transformer 12; 16 is the 1 of the mobile transformer 12;
High voltage switch with current limiting fuse connected to the next side, 17
is the battery loaded on vehicle 11, and inverter 1
8, it is used as a motor power source for the non-voltage tap changer 15 and as a control power source for a phase detection operation control device 31, which will be described later. 19 is a converter that converts the AC supplied from the secondary side of the mobile transformer 12 into DC and supplies it to the phase detection operation control device 31 as a control power source;
20 is an operation panel of the phase detection operation control circuit 31;
1 is a display panel for phase detection results.

Next, the configuration of the phase detection operation control device 31 will be explained with reference to FIG.

As shown in FIG. 1, this phase detection operation control device 31 has a phase detection circuit 32 that compares and processes the signal inputted from the detection circuit 32 with preprogrammed contents during phase detection. An arithmetic discrimination circuit 35 consisting of a so-called one-chip microcomputer that outputs a required output signal or outputs a corresponding signal when no input signal is input from the detection circuit 32; A display circuit 36 that lights up an indicator light in accordance with the above, and a switch circuit 37 that operates the phase detection operation control device 31.
It is constituted by a control power supply circuit 40 that supplies control power to the control device 31, and an interlock circuit 45 for the wiring sheath disconnector 12.

Then, the phase detection detection circuit 32 connects one bank B ₁
pole transformer Tr ₁ and pole transformer of the other bank B ₂
Bank selection switch 3 that selectively switches between Tr ₂ and Tr 2
3, and each phase B, K, on the secondary side of the mobile transformer 12.
Detect the voltage difference between R, N and the secondary side phases B, K, R, and N of each bank's pole transformers Tr ₁ and Tr ₂ , and compare that voltage difference with a preset reference voltage.
and a comparator 34 for comparing the voltage with the reference voltage Vr, and when the voltage difference is larger than the reference voltage Vr, the comparator 34
A signal is output from the output terminal of the output terminal, and conversely, when the reference voltage is higher, the signal is not output. A control program that operates in response to the presence or absence of an output from the detection circuit 32 is preset in the calculation determination circuit 35, which is made up of a one-chip microcomputer, as follows.

(1) Function to determine whether voltage detection/phase detection test is good or not (2) Function to determine connection change of B and K phases (3) Function to determine connection change of K and R phases (4) Connection of R and B phases (5) Switching determination function for grounded phase switching switch (6) Identification function for phase detection failure (7) Phase detection/good discrimination function for each bank (8) Phase detection/good/invalid and phase detection The display circuit 36 has various relays T ₁ , T ₂ , BK, KR, which are operated by the output signal from the calculation discrimination circuit 35.
RB, N, X, _D1 , _D2 , and each auxiliary contact _t1 , _t2 , bk, kr, rb, n, x, _b1 , _b2 of these relays, By checking the lighting status of the indicator lights L ₂ to _{L 10} that are lit according to the operation of the phase detector, it is possible to know the phase detection result and the connection change of each phase cable. The switch circuit 37 is provided with a phase detection operation switch 38 that switches the operation of the calculation discrimination circuit 35 to voltage detection and phase detection, and its contacts a and _b .
Judgment is based on whether the light is off. The control power supply circuit 40 is configured to be able to supply power from the on-vehicle battery 17 and the mobile transformer 12 to the calculation and determination circuit 35. Furthermore, the interlock circuit 45 of the wiring sheath breakers 14a and 14b connects one input terminal of the AND circuits A ₁ and A ₂ to the output terminal of the arithmetic determination circuit 35, and the other input terminal connects the display circuit 36. It is connected to the relay circuits D ₁ and D ₂ of the indicator lights L ₉ and L ₁₀ inserted and connected to the operation switches CS ₁ and CS ₂ , respectively.
Further, the output terminals of the AND circuits A ₁ and A ₂ are connected to wiring shear disconnectors 14a and 1 through motors M ₁ and M ₂ , respectively.
4b.

In FIG. 3, CS ₃ is an operating switch for the voltageless tap changer 15.

Next, the operation will be explained.

When performing phase inspection work, perform the following preliminary work. That is, in FIG. 3, the high voltage switch 16 is opened, the operation switch SC ₃ is turned on, the non-voltage tap changer 15 is operated, and the tap voltage of the mobile transformer 12 is changed to the pole transformer Tr in the construction zone. ₁ , match the tap voltage of Tr ₂ . The voltageless tap changer 15 is driven by AC power supplied from a battery 17 via an inverter 18, and switches the taps one tap at a time to match the tap voltage.
Next, select the bank to be used (in this example, 2
(Explained with an example using B ₁ and B ₂ ) Pole-mounted transformer
Tr ₁ and Tr ₂ and the load side of the wiring sheath breakers 14a and 14b are connected by cables C ₁ and C ₂ as shown in Fig. 3, and then the high voltage switch 16 which is open is connected. Insert. In this case, the pole transformer Tr ₁ ,
If the power distribution system of Tr ₂ is shared lighting, the three phases B, K, and R are turned on, and when the power distribution system is not shared lighting, only the two phases B and K are turned on. (Explained using an example of power distribution method). The high voltage switch 1
6 is turned on, the mobile transformer 12 is excited, and the current is converted to DC via the converter 19 and to the mobile transformer 12 side of the wiring sheath disconnectors 14a and 14b.
The phase detection operation control device 31 is energized. At this time, the interlock circuit 45 of the wiring sheath disconnectors 14a and 14b is locked by the command signal from the calculation discrimination circuit 35, so even if the operating switches CS ₁ and CS ₂ are operated by mistake, they will not be closed. It never happens. After this, a voltage detection and phase detection test will be performed.

First, in the voltage detection test, the phase detection operation switch 38 attached to the switch circuit 37 is turned on to the contact a side. By turning on the switch 38, the high voltage switch 16
If the cable on the side is connected correctly according to the predetermined power distribution method, a command signal of "voltage test good", which is pre-programmed in the calculation discrimination circuit 35, is output from the discrimination circuit 35, and the display circuit 3
Turn on the voltage detection indicator _L1 of 6.

If the voltage test is "fail", the voltage detection indicator _L1 will not light up. In this case, the switch 38 is once opened, it is confirmed whether the high voltage switch 16 is connected correctly, and the voltage detection test is performed again.

When performing a phase detection test, press the phase detection operation switch 3.
8 to the contact b side. As a result, a voltage detection relay (not shown) detects whether the voltage of each phase B, K, and R on the primary side of the mobile transformer 12 has reached a predetermined voltage level. For example, a preprogrammed "phase detection test pass" command signal is output from the calculation discrimination circuit 35, and the relay T ₁ of the display circuit 36 is output.
is energized, its auxiliary contact _t1 is closed, and the indicator light
Light up L ₂ to indicate that the phase detection test is "good". On the other hand, each phase of B, K, R, or
When one of the phases does not reach the predetermined voltage level, a “phase verification test/failure” signal is output from the calculation discrimination circuit 35, and the relay T ₂ of the display circuit 36 is output.
is energized, and its auxiliary contact _t2 lights up the indicator light _L3 . In this case, the switch 38 is opened as in the voltage detection test, and then the high voltage switch 16 is also opened to investigate why the voltage levels of each phase on the primary side of the mobile transformer 12 do not match. After the cause has been determined and countermeasures have been taken, the phase verification test is performed again, and the test result is confirmed by lighting up the "Phase verification test good" indicator light _L2 . Continuing, each pillar bank
Phase detection work is performed to match B ₁ and B ₂ to the secondary side of the mobile transformer 12.

This phase detection work will be explained with reference to the electrical circuit diagram of the phase detection operation control device 31 shown in FIG. 1 and the flowchart shown in FIG. 4.

When performing phase detection for bank B ₁ first, set the bank selection switch 33 to the pole transformer as shown in Figure 1.
Switch to contact c of bank B ₁ located on the Tr ₁ side.
Next, turn the phase detection operation switch 38 to contact b on the phase detection side.
By switching to , the mobile transformer 12 shown in FIG. 1 is matched with each phase B, K, R, and N of bank _B1 . That is, if the phase connections in each phase are correctly performed, on the bank B ₁ side, the potential between the load side of the wiring sheath breaker 14a and the mobile transformer 12 side will be the same potential, and the phase detection will be performed. The comparator 34 on the line 32 has no input of the voltage difference because the potential between the two poles of the insulation breaker 14a is "OV", and only the reference voltage Vr is input, and the reference voltage Vr Since the voltage is high, no signal is output from the comparator 34. On the other hand, since there is no output from the phase detection detection circuit 32, the arithmetic determination circuit 35 determines that the connections are correct for each phase, and determines that the "phase detection/good condition" of bank B ₁ , which is programmed in advance, is correct. '' is output to the display circuit 36, the relay _D1 is energized, and its auxiliary contact _b1 is turned on, thereby lighting up the indicator light _L9 . Indicator light
When _L9 is turned on, a command signal is simultaneously outputted from the calculation/discrimination circuit 35 to the interlock circuit 45 to release the interlock of the wiring sheath disconnector 14a. As a result, when operating switch CS ₁ is turned on,
The output conditions of the AND circuit _A1 match, and the wiring sheath breaker 14a is turned on. Thereafter, the bank selection switch 33 and the phase detection operation switch 38 are opened, respectively, and the phase detection of bank _B1 is completed.

However, when phase-checking bank B ₁ , if the phase connection is incorrect, for example, when connecting the K-phase of pole-mounted Tr ₁ and the K-phase cable on the mobile transformer 12 side, the R-phase may be mistakenly connected. This is when I feel like I've connected with someone.
In this case, in FIG. 1, since the connections between the K phase and the R phase are different, one input end of the comparator 34 connected to these phases K and R is connected to the K and R phases on the pole transformer Tr ₁ side. The R phase and the K and R phases on the mobile transformer 12 side are not at the same potential, and a voltage higher than the reference voltage Vr (a difference occurs in the potential between the two poles of the distribution circuit breaker 14a, and the voltage of that difference) is generated. The voltage is input and is higher than the reference voltage Vr, and the comparator 34 outputs an output signal corresponding to the voltage of the K and R phases. As a result, a program corresponding to this signal is set in advance in the arithmetic discrimination circuit 35, and a command signal to "switch the K and R phase cables" is output from the arithmetic discrimination circuit 35 to the relay KR. energizes relay KR, and its auxiliary contact kr closes, causing indicator light L ₅ to light up. This indicator light L ₅ says "KR replacement", and after confirming this display, perform the phase detection operation once. Open switch 38. Then, after exchanging the phase connections based on the contents of the instruction from the indicator light _L5 , the switch 38 is turned on to the voltage detection side to check whether the cables are correctly connected to the phases.
When it is determined that "voltage detection is good" is determined by the lighting of the voltage detection lamp _L1 , the phase detection switch 38 is immediately switched to the phase detection side and the phase detection is performed again. As a result, if the phase connection is performed correctly, a judgment is made that "phase detection is good", the indicator light L ₉ lights up, and the same operation as above is performed to complete the phase detection of bank B ₁ . .

However, when the connections of the K and R phases and the connections of the R and B phases are different, the calculation determination circuit 35
A signal to excite both BK and RB relays is output, and in order to switch these connections, the indicator lights L ₅ and L ₆ labeled "BK exchange" and "RB exchange" are auxiliary contacts kr and rb.
It lights up when it closes. In this case as well, perform the correct phase connection according to the replacement display, perform the phase verification test again, confirm the phase connection, and finish the phase verification of bank _B1 .

Furthermore, even if each phase is connected correctly, if the mobile transformer 12 is not properly grounded, a signal is output from the comparator 34 connected to the N phase, and a signal is output from the comparator 34 connected to the N phase. A preprogrammed "N phase switching" signal is output to relay N, its auxiliary contact n closes, and N
Turn on the indicator light L ₇ that says phase switching. By lighting the indicator light L ₇ , the grounding switch 13 is switched to the correct direction. As a result, the indicator light _L9 that says "Phase detection OK" lights up, indicating that the switch has been switched in the correct direction.

Furthermore, when performing matching, if some phase connections are incomplete or the cable that was supposed to be connected has completely fallen off, that phase is the same as a disconnection, so the calculation judgment circuit 35 outputs a "phase detection/no" command signal to relay X, and its auxiliary contact x
is closed, and indicator light _L8 is lit to indicate that phase verification work cannot be performed. At this time, the bank selection switch 33 and the phase detection operation switch 38 are opened and closed to investigate the cause, and once the cause has been determined, phase detection is performed again.

In this way, the phase inspection of bank B ₁ is "good phase inspection".
When the indicator light _L9 that says ``L9'' lights up, it is possible to turn on the wiring cutter 14a, and its operation switch is turned on.
When CS ₁ is turned on, mobile transformer 12 and pole transformer Tr ₁
are connected in parallel. As a result, when the pole transformer Tr ₁ is removed, the entire load is borne by the mobile transformer 12, and the supply to the load side can be continued without interruption.

If you wish to continue phase detection for bank B ₂ , set the bank selection switch 33 to bank B ₂ in FIG.
All you have to do is switch to contact d on the side. this bank
The phase detection operation in bank _B2 can be performed in the same manner as in the phase detection in bank _B1 , so the explanation will be omitted. If the phase detection of bank B ₂ is good, the mobile transformer 12 can be used by connecting two banks B ₁ and _B in parallel.

In addition, if a replacement display occurs during the phase verification work, that display will continue to be displayed until it is cleared. In addition, if you do not perform the connection change operation according to the instructions displayed, if you repeat this a predetermined number of times, the ``phase check/unable'' indicator light _L8 will come on, and the phase check operation will be temporarily interrupted and then restarted. It has become possible to carry out phase inspections since then.

The finishing work after using the mobile transformer 12 is as follows:
This can be done by reversing the work start procedure. In this case, the wiring sheath disconnectors 14a and 14b are deinterlocked by the AND circuits _A1 and _A2 , but when the high voltage switch 16 is opened, the mobile transformer is disconnected by the low voltage relay (not shown). When it is detected that the excitation of 12 has been released, the arithmetic and discrimination circuit 35 outputs a command signal to lock the interlock circuit 45 based on the detection signal, and the motors M ₁ of the wiring shear breakers 14a and 14b are activated. , _M2 to open the shield breakers 14a, 14b, and from now on,
It continues to be locked as long as a "good" output signal is not output, thereby eliminating any accidents caused by closing the wiring switches 14a, 14b before phase inspection.

Although the present invention has been described with reference to an example in which it is applied to a power distribution system for common lighting and operation, it is of course applicable to most low-voltage power distribution systems such as 1-phase 2-wire system, 1-phase 3-wire system, etc. It is.

[Effects of the Invention] Since the present invention is configured as described above, it has the following effects.

(1) During phase detection, if there are phases with mismatched phase connections, these phases are automatically detected and specific instructions for phase replacement are displayed, so that the phase connections can be replaced quickly and reliably. be able to.

(2) During or before phase inspection, the wiring shield or disconnector is equipped with a function to interlock, so it is possible to prevent the wiring shield or disconnector from being turned on by mistake before the phase detection result is determined. Even if an attempt is made to do so, it will not be possible to input the power, and as a result, it is possible to reliably prevent an unexpected accident from occurring on the customer side, and to perform the phase inspection work safely.

(3) Furthermore, if the same connection mistake is made more than a certain number of times, a message indicating that phase verification is not possible can be displayed by command from the control device.
Thereby, it is possible to avoid unnecessarily prolonging the phase verification time, and it is possible to effectively carry out phase verification work and countermeasures when phase verification is impossible.

[Brief explanation of drawings]

Fig. 1 is an electrical circuit diagram of a phase detection operation control device according to the present invention, Fig. 2 is a schematic configuration diagram of a mobile transformer equipped with the present invention, Fig. 3 is a wiring diagram of the mobile transformer, and Fig. 4 is a diagram of the present invention. A flowchart diagram for explaining the operation of the invention, and FIG. 5 is a wiring diagram of a conventional mobile transformer. 12...Mobile transformer, 13...Earth phase switching switch, 14a, 14b...Wiring cutter, 31...
...Phase test operation control device, 32...Phase test detection circuit, 3
5...Arithmetic discrimination circuit, 45...Interlock circuit.

Claims (1)

[Claims] 1. When a voltage difference occurs between the poles of the mobile transformer side and the load side of a wiring shear disconnector due to a mismatch in phase connection, this is detected, and this detection signal is used to determine which phase is mismatched. The display means displays the determination results, such as the correct connection of mismatched phases and whether phase verification is impossible, and the phase verification is performed based on the connection status of each phase and interaction with the display means. A method for phase detection of a mobile transformer, characterized in that the phase detection method is performed after checking. 2. A phase detection circuit that detects the voltage difference between the two poles of the wiring shield and disconnector during phase detection, and compares the input signal from the phase detection circuit with pre-programmed sequence contents to issue specific instructions. An arithmetic discrimination circuit that outputs a command signal, a display circuit that displays the output signal from the arithmetic discrimination circuit in an interactive manner, and a wiring sheath breaker that is turned on by a command from the arithmetic discrimination circuit during phase detection. A phase detection device for a mobile transformer, characterized in that a phase detection operation control device is constructed by comprising an interlock circuit that prevents phase detection, and a phase detection operation is performed based on display contents displayed from a display circuit. .