JP4500130B2 - Method and apparatus for checking wiring connection of outlet with ground electrode - Google Patents

Description

In the present invention, when the grounding in the power distribution system is the TT grounding system or the TN grounding system, when an outlet with a grounding electrode is used on the terminal side, a check is made for an incorrect wiring connection between the neutral electrode and the grounding electrode of the outlet. The present invention relates to a method and an apparatus.

In recent years, it has been recommended to use an outlet with a grounding electrode for noise and safety reasons. Conventionally, there are devices such as Patent Documents 1, 2, and 3 as a check device for the wiring connection between the neutral electrode and the ground electrode of the outlet with a ground electrode. In Patent Document 1, a resistor is connected from the voltage pole of the outlet to the grounding pole to check whether or not current flows. If current does not flow, grounding is not successful or the grounding wire is connected. It is like judging that it is not done or is disconnected.

Further, Patent Documents 2 and 3 show that not only the connection of the ground electrode but also the connection of the neutral electrode to the ground electrode is incorrect (the neutral phase is connected to the ground electrode of the outlet). (The wire is connected to the neutral pole of the outlet).
JP 2000-180496 A JP-A-5-31878 JP 2003-107121 A

However, the method according to Patent Document 1 has a problem that it is not possible to check the connection error between the neutral electrode and the ground electrode shown in Patent Documents 2 and 3, and the method according to Patent Document 2 cannot be performed via the same resistor. Compare the current flowing from the voltage electrode to the neutral electrode and the current flowing from the voltage electrode to the ground electrode, and determine the connection error. When the grounding resistance is low (according to Patent Document 2, it becomes 1Ω or less) There was a problem that it was difficult to distinguish.

In recent years, in buildings, etc., there are many cases where the grounding of transformers that receive high voltage and convert it to low voltage is common with the grounding of load equipment. In that case, the resistance of the grounding wire may be very low. In Japan, the introduction of a method to route a dedicated grounding line from the grounding point on the power source side to the end, called the TN system, is called out as a method of wiring equipment in IEC standards. The difference in the resistance of the neutral wire is equal to zero, and in such a case, it is difficult to determine a connection error by the method according to Patent Document 2.

In the method according to Patent Document 3, a ground fault current is caused to flow from the voltage electrode to the ground electrode on the slave unit connected to the outlet, and the zero-phase current is detected by the master unit installed on the distribution board side, and the value is transferred to the slave unit. Since the transmission state is read and the value is read by the slave unit, the connection state of the grounding electrode is confirmed. Therefore, even when the grounding resistance or the resistance of the grounding wire is low, it is not impossible to make a determination as in Patent Document 2. .

However, in the method of Patent Document 3, a problem arises in that the main unit must be installed to measure the zero-phase current of the main line on the distribution board side and transmit the measurement result to the slave unit on the outlet side. was there.

Accordingly, an object of the present invention is to provide a method and apparatus that can more easily and simply check whether or not the wiring connection between the ground electrode and the neutral electrode of the outlet with a ground electrode is definitely made. It is an issue.

In order to solve the above problems, in claim 1 of the present invention, the neutral wire side of the transformer secondary winding is grounded to the ground, and at the same time, the ground-only wire is connected to the load side from the transformer side end of the neutral wire. In a distribution facility in which a grounded pole outlet is connected to the load side of a TN grounding distribution system wired to the ground, grounding the connection point between the transformer-side end of the dedicated ground line and the neutral line or in the middle of the dedicated ground line By temporarily inserting impedance between the connections of the dedicated lines , or in the middle of the neutral line or ground dedicated line in the distribution board, an impedance difference is created between the ground dedicated line and the neutral line. When connecting the voltage pole and neutral pole, and between the voltage pole and ground pole via the impedance of the same value, connect the neutral pole and ground pole of the outlet to the wiring by comparing the magnitude of the flowing current Characterized by checking the polarity That provides wiring connection check method grounded outlet, is obtained by providing a wire connection checking apparatus according to claim 5, wherein the grounded outlet.

In claim 2, the terminal of the TT grounding distribution system in which the neutral wire side of the secondary winding of the transformer is grounded to the ground and the grounding terminal of the distribution board arranged on the load side of the circuit is grounded. In a distribution facility connected to an outlet with a grounding electrode , the impedance difference between the neutral line and the grounding line is increased by temporarily inserting an impedance between the grounding terminal of the distribution board and the ground, and the voltage of the outlet When the pole and neutral pole, and the voltage pole and ground pole are connected via the same impedance, the polarity of the connection between the neutral pole and ground pole of the outlet can be determined by comparing the magnitude of the flowing current. A wiring connection check method and apparatus for an outlet with a grounding electrode is provided , and the wiring connection check apparatus for the outlet with a grounding electrode is provided in claim 6 .

Delete

In claim 3 , the neutral side of the secondary winding of the transformer is grounded, and at the same time, the load side of the TN grounding distribution system in which a dedicated ground line is wired from the transformer end of the neutral wire to the load side. in power distribution equipment connected to earthing contact with outlet, joined portion of the ground dedicated line between the middle of the connection point of the transformer side end of the neutral line or between the ground dedicated line of the ground dedicated line, or, power distribution Impedance was generated on the side of the grounding dedicated line by temporarily inserting impedance in the middle of the neutral wire or grounding dedicated wire in the panel, and voltage was applied between the neutral electrode and the grounding electrode of the outlet with the grounding electrode. Measure the voltage aspect between the voltage pole and neutral pole or between the voltage pole and ground pole in two situations, when and not, and compare the measurement results to determine the polarity of the connection between the neutral pole and ground pole of the outlet. Connection characterized by checking To provide a wiring connection check method Kiwametsuki outlet, it is obtained by providing a wire connection checking apparatus of the in claim 7 grounded outlet.

In claim 4 , the neutral wire side of the secondary winding of the transformer is grounded, and at the same time, the grounding terminal of the distribution board arranged on the load side of the circuit is grounded at the terminal of the TT grounding distribution system In power distribution equipment connected to an outlet with a pole, do not apply when an impedance is temporarily inserted between the grounding terminal of the distribution board and the ground, and a voltage is applied between the neutral pole and the earthing pole of the outlet with the ground pole. Measure the voltage phase between the voltage pole and neutral pole or between the voltage pole and ground pole in the two states, and check the connection polarity of the neutral pole and ground pole of the outlet to the wiring by comparing the measurement results A wiring connection check method for an outlet with a grounding electrode is provided, and the wiring connection checking device for the outlet with a grounding electrode is provided in claim 8 .

According to the invention of claim 1 or claim 5 , the neutral wire side of the secondary winding of the transformer is grounded, and at the same time, the TN grounding in which the ground-only wire is wired from the transformer end of the neutral wire to the load side. Even in the power distribution system of the type , the neutral wire in the distribution board between the transformer-side end of the ground dedicated wire and the neutral wire or between the connection portions of the ground dedicated wires at the connection point in the middle of the ground dedicated wire Or , by temporarily inserting an impedance in the middle of the grounding dedicated line, it is possible to make a difference in impedance between the grounding dedicated line and the neutral line. Can be easily checked for the polarity of the connection between the neutral pole and the ground pole of the outlet by comparing the magnitude of the flowing current.

According to the invention of claim 2 or claim 6, the transformer secondary winding at the same time grounding the neutral line side, TT grounding scheme grounded ground terminal of the distribution board that is disposed on the load side of the path Even if the grounding resistance is very low, the apparent grounding resistance is increased by temporarily inserting an impedance between the grounding terminal of the distribution board and the ground, and the neutral and grounding wires The difference in impedance between the voltage pole and the neutral pole of the outlet can be increased, and when the voltage pole and the grounding pole are connected through the same impedance, it is possible to compare the magnitude of the current that flows. It is possible to easily check the connection polarity of the outlet's neutral and grounding poles to the wiring.

Delete

According to the invention of claim 3 or claim 7 , the neutral line side of the secondary winding of the transformer is grounded, and at the same time, a dedicated ground line is wired from the transformer end of the neutral line to the load side. In a TN grounding type distribution facility in which a grounded outlet is connected to the load side of the load, the connection between the transformer-side end of the ground dedicated line and the ground dedicated line between the neutral line or the middle of the ground dedicated line If the impedance is temporarily inserted between the sections or in the middle of the neutral line or ground dedicated line in the distribution board , if impedance is generated on the ground dedicated line side and the wiring connection to each pole of the outlet is correct, It does not change when voltage is applied to the neutral and grounding poles of the outlet. On the other hand, the voltage between the voltage pole and the grounding pole varies depending on whether or not voltage is applied to the outlet's neutral and grounding poles, making it easy to connect the outlet's neutral and grounding poles to the wiring. Can be checked.

According to the invention of claim 4 or claim 8 , the neutral line side of the secondary winding of the transformer is grounded and at the same time the grounding terminal of the distribution board arranged on the load side of the circuit is grounded. in power distribution equipment of T T grounding scheme connecting the grounded outlet to the end, the ground resistance from the insertion of the impedance temporarily between the ground and the ground terminal of the distribution board, the power supply side of the transformer neutral Even if the grounding resistance of the distribution board on the load side is low, the apparent grounding resistance can be increased, so if the wiring connection to each pole of the outlet is correct, the voltage on the neutral and grounding poles of the outlet It does not change depending on whether or not is applied. On the other hand, the voltage between the voltage pole and the grounding pole varies depending on whether or not voltage is applied to the outlet's neutral and grounding poles, making it easy to connect the outlet's neutral and grounding poles to the wiring. Can be checked.

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram of an embodiment of a method according to claim 1 of the present invention or an apparatus according to claim 5 and is an example of a TN grounding distribution system. 1 is a transformer on the power source side, 2 is a voltage line of the secondary winding of the transformer, 3 is a neutral line of the secondary winding of the transformer, 4 is a dedicated ground wire, and 5 is a secondary winding of the transformer. This is a ground wire with the neutral wire side of the wire connected to the ground. 6 is simply described as a relay connection means such as a distribution board installed in the middle of the electric circuit. Reference numeral 7 denotes an outlet with a ground electrode connected to the electric circuit, 701 is a neutral electrode, 702 is a voltage electrode, and 703 is a ground electrode.

8 and 8 'are impedances temporarily inserted into the grounding dedicated line side, 8 is inserted between the end of the grounding dedicated line 4 on the transformer 1 side and the neutral line 3, and 8' is in the electric circuit. The case where it is inserted between the ground dedicated line connection terminals in the distribution board 6 is shown. It is inserted only at the time of check, and is always in a short state.

9 is a check device on the outlet side, comprising a connection conductor 901 to the neutral electrode 701 of the outlet 7, a connection conductor 902 to the voltage electrode 702, a connection conductor 903 to the ground electrode 703, and a resistance 904 ammeter 905, The resistor 904 can be connected by switching to the connection conductors 901 and 903.

The polarity check by the method or apparatus shown in FIG. 1 will be described. First, the impedance 8 or 8 'is inserted and attached to the dedicated ground line 4. In this case, if the transformer itself is a customer facility, for example, in a power receiving room in the same building or site, and the polarity of the outlet of the entire system is to be checked, one distribution board at position 8 When checking only the outlets after that, or when the transformer is a facility of an electric power company and not that of a consumer, it is properly used at the 8 'position.

Next, the connection conductors 901 to 903 of the check device 9 on the outlet side are connected to the respective poles of the outlet 7 as shown in the figure, and the resistor 904 is switched and connected to the connection conductors 901 and 903. Measure with a total of 905. When the resistor 904 is connected to the connection conductor 903, the connection of the outlet is correct if the current is small, and the connection is incorrect if the current is large.

The resistance of the check device on the outlet side is not limited to one, but may be provided in advance on the connection conductors 901 and 903 as long as they have the same resistance value, and the current comparison is not performed by the ammeter 905. Even if the voltage across the resistor 904 is measured, various methods can be considered as long as the results are the same in principle. Further, only the result may be displayed by making the determination electronically and automatically.

Next, an embodiment of the invention of claim 2 or claim 6 will be described with reference to FIG. FIG. 2 shows an example of a TT grounding distribution system. 1, 2, 3, 5, 7, and 9 are the same as those in FIG. The ground wire 4 is connected to the ground terminal 6 ′ of the distribution board 6, and the ground terminal 6 ′ is connected to the ground by the ground 10. 8 ″ is an impedance temporarily inserted between the ground line 4 and the ground 10.

The check method and determination according to FIG. 2 are the same as those of FIG. 1, but in this embodiment, the connection polarity of the outlet can be checked even when the ground resistance of the ground 5 or 10 is very low by the TT grounding method. .

Next, another example will be described with reference to FIG. FIG. 3 shows an example of a TT grounding distribution system. 1, 2, 3, 4, 5, 6, 7, and 10 are the same as those in FIG. Rg is a resistance obtained by replacing ground resistances of the grounds 5 and 10 for convenience.

11 is a device connected to the outlet 7, 1101 is a connecting conductor connected to the neutral electrode 701 of the outlet 7, 1102 is a connecting conductor connected to the voltage electrode 702, and 1103 is also connected to the ground electrode 703. A conductor 1104 is a power source, and a voltage is applied between the neutral pole and the ground pole of the outlet by opening and closing the switch 1105. Reference numeral 1106 denotes a voltage measuring device.

The outlet check in FIG. 3 determines that the connection is correct if there is no difference between the measurement results of the voltage measuring device 1106 when the switch 1105 is turned on and when it is turned off. In other words, the voltage of the power source 1104 is not applied between the neutral line and the voltage line, and the voltage between the neutral line and the voltage line is the secondary winding of the transformer 1 regardless of whether the switch 1105 is turned on or off. It is because it is equal to the voltage of. On the contrary, between the voltage electrode 702 and the ground electrode 703 of the outlet 7, a combined voltage of the secondary winding voltage of the transformer 1 and the voltage of the power source 1104 appears when the switch 1105 is turned on and off, and when the switch 1 is turned off, Since the secondary voltage of 1 appears as it is, the voltage changes in two states of 1105, so if the neutral electrode 701 is mistakenly connected to the ground wire 4 and the ground electrode 703 is mistakenly connected to the neutral wire 3 When it is done, the voltage changes and appears.

In FIG. 3, the voltage measuring device 1106 may measure the voltage between the voltage electrode 702 and the ground electrode 703, and in this case, if the voltage changes due to turning on and off of the switch 1105, it is determined that the connection is correct. . Further, when the power source 1104 is an AC power source, the frequency thereof may be the same as the frequency of the voltage supplied from the transformer 1, and in this case, the voltage measuring device 1106 can determine by measuring the voltage value. It is. The power source 1104 may have a frequency different from that of the voltage supplied from the transformer 1 or may be a direct current in an extreme case. In this case, a voltage measuring device 1106 such as a waveform display device, a device that displays the voltage of the frequency component of the power supply 1104, or a device that displays a DC voltage can be used. Furthermore, an electronic circuit that automatically determines a change in voltage and displays the result may be added.

If the voltage of the power source 1104 is a direct current or high frequency in a region where the earth leakage breaker normally installed in the distribution board 6 does not operate, sufficient current can flow without operating the earth leakage breaker at the time of check. Convenient to do.

Next, an embodiment of claim 3 or claim 7 is shown in FIG. FIG. 4 is a diagram showing a case where the outlet side check device shown in FIG. 3 is used in a TN grounding type distribution facility. Just by replacing the check device 9 in FIG. 1 with 11, an impedance 8 or 8 ′ is temporarily inserted into the dedicated ground line 4 as in FIG. 7 wiring connection polarity can be checked.

Next, an embodiment of claim 4 or claim 8 is shown in FIG. FIG. 5 is a diagram of a case where the outlet side check device shown in FIG. 3 is used when the grounding resistance is very low in a TT grounding type distribution facility. Just by replacing the check device 9 of FIG. 2 with 11, the impedance 8 ″ is temporarily inserted into the dedicated ground line 4 in the same manner as in FIG. The wiring connection polarity can be checked.

It can be applied to a simple device that checks the connection polarity of all the outlets by combining it with the means for checking whether the outlet's voltage is connected to the voltage line. Furthermore, it can be applied to a device that comprehensively checks outlet voltage, connection polarity, ground resistance, and the like.

Figure of an embodiment of claim 1 Figure of embodiment of claim 2 Illustration of another example Figure of embodiment of claim 3 Figure of embodiment of claim 4

1 Transformer 2 Voltage line 3 Neutral wire 4 Ground wire 5 Transformer ground 6 Distribution board 7 such as distribution board 7 Grounding outlet 8, 8 ', 8 "Impedance 9 to be inserted temporarily 9 Outlet checking device 10 distribution board side grounding 11 outlet side checking device

Claims (8)

At the same time that the neutral wire side of the secondary winding of the transformer is grounded to the ground, a grounding electrode is provided on the load side of the TN grounding distribution system in which a dedicated grounding wire is wired from the end of the neutral wire to the load side. In power distribution equipment connected to an outlet,
Between the connection between the transformer-side end of the ground dedicated line and the neutral line or between the ground dedicated lines at the connection point in the middle of the ground dedicated line , or in the middle of the neutral line or ground dedicated line in the distribution board By temporarily inserting impedance into the ground, the impedance difference between the ground dedicated line and the neutral line
When the voltage pole and the neutral pole of the outlet are connected via the impedance of the same value between the voltage pole and the neutral pole, the comparison of the magnitude of the current that flows to the wiring of the outlet's neutral and ground poles A method for checking the wiring connection of an outlet with a grounding electrode, characterized by checking the connection polarity. Attach the grounding side of the transformer secondary winding to the ground and at the same time connect a grounding outlet to the terminal of the TT grounding distribution system with the grounding terminal of the distribution board on the load side of the circuit grounded In the connected power distribution equipment,
By temporarily inserting an impedance between the grounding terminal of the distribution board and the ground, the difference in impedance between the neutral wire and the ground wire is increased ,
When the voltage pole and the neutral pole of the outlet are connected via the impedance of the same value between the voltage pole and the neutral pole, the comparison of the magnitude of the current that flows to the wiring of the outlet's neutral and ground poles A wiring connection check method for an outlet with a grounding electrode, characterized by checking connection polarity. At the same time as grounding the neutral wire side of the secondary winding of the transformer, connect a grounding outlet to the load side of the TN grounding distribution system in which a dedicated grounding wire is wired from the end of the neutral wire to the load side. In the connected power distribution equipment,
Between the connection between the transformer-side end of the ground dedicated line and the neutral line or between the ground dedicated lines at the connection point in the middle of the ground dedicated line, or in the middle of the neutral line or ground dedicated line in the distribution board By temporarily inserting an impedance into the ground, the impedance is generated on the dedicated ground line side ,
Measure the voltage aspect between the voltage pole and neutral pole or between the voltage pole and ground pole in two states, when the voltage is applied between the neutral pole and ground pole of the outlet with the ground pole and when it is not. A method for checking the wiring connection of an outlet with a grounding electrode, characterized by checking the polarity of the connection between the neutral pole and grounding electrode of the outlet by comparing the above. At the same time that the neutral wire side of the transformer secondary winding was grounded, an outlet with a grounding electrode was connected to the terminal of the TT grounding distribution system in which the grounding terminal of the distribution board placed on the load side of the circuit was grounded In power distribution equipment, an impedance is temporarily inserted between the grounding terminal of the distribution board and the ground, and when the voltage is applied between the neutral pole and the grounding pole of the outlet with the grounding pole, there are two states: , Measuring the voltage phase between the voltage electrode and neutral electrode or between the voltage electrode and the earth electrode, and checking the connection polarity of the neutral electrode and earth electrode to the wiring by comparing the measurement results How to check the wiring connection of the attached outlet. At the same time that the neutral wire side of the secondary winding of the transformer is grounded to the ground, a grounding electrode is provided on the load side of the TN grounding distribution system in which a dedicated grounding wire is wired from the end of the neutral wire to the load side. In power distribution equipment connected to an outlet,
Between the connection between the transformer-side end of the ground dedicated line and the neutral line or between the ground dedicated lines at the connection point in the middle of the ground dedicated line, or in the middle of the neutral line or ground dedicated line in the distribution board By temporarily inserting impedance into the ground, the impedance difference between the ground dedicated line and the neutral line
When the voltage pole and the neutral pole of the outlet are connected via the impedance of the same value between the voltage pole and the neutral pole, the comparison of the magnitude of the current that flows to the wiring of the outlet's neutral and ground poles A wiring connection check device for an outlet with a grounding electrode, characterized by checking the connection polarity. Attach the grounding side of the transformer secondary winding to the ground and at the same time connect a grounding outlet to the terminal of the TT grounding distribution system with the grounding terminal of the distribution board on the load side of the circuit grounded In the connected power distribution equipment,
By temporarily inserting an impedance between the grounding terminal of the distribution board and the ground, the difference in impedance between the neutral wire and the ground wire is increased,
When the voltage pole and the neutral pole of the outlet are connected via the impedance of the same value between the voltage pole and the neutral pole, the comparison of the magnitude of the current that flows to the wiring of the outlet's neutral and ground poles A wiring connection check device for an outlet with a grounding electrode, characterized by checking the connection polarity. At the same time as grounding the neutral wire side of the secondary winding of the transformer, connect a grounding outlet to the load side of the TN grounding distribution system in which a dedicated grounding wire is wired from the end of the neutral wire to the load side. In the connected power distribution equipment,
Between the connection between the transformer-side end of the ground dedicated line and the neutral line or between the ground dedicated lines at the connection point in the middle of the ground dedicated line, or in the middle of the neutral line or ground dedicated line in the distribution board By temporarily inserting an impedance into the ground, the impedance is generated on the dedicated ground line side,
Measure the voltage aspect between the voltage pole and neutral pole or between the voltage pole and ground pole in two states, when the voltage is applied between the neutral pole and ground pole of the outlet with the ground pole and when it is not. A wiring connection check device for outlets with a grounding electrode, which checks the polarity of the connection between the neutral and grounding of the outlet by comparing At the same time that the neutral wire side of the transformer secondary winding was grounded, an outlet with a grounding electrode was connected to the terminal of the TT grounding distribution system in which the grounding terminal of the distribution board placed on the load side of the circuit was grounded In power distribution equipment, an impedance is temporarily inserted between the grounding terminal of the distribution board and the ground, and when the voltage is applied between the neutral pole and the grounding pole of the outlet with the grounding pole, there are two states: , Measuring the voltage phase between the voltage electrode and neutral electrode or between the voltage electrode and the earth electrode, and checking the connection polarity of the neutral electrode and earth electrode to the wiring by comparing the measurement results Wire connection check device with outlet.

Images