JP2006053006A - Method and apparatus for checking wiring connection of earthing-type wall socket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus capable of easily and simply checking whether an earth electrode and a neutral electrode of an earthing-type wall socket are unmistakably wired and connected or not. <P>SOLUTION: In a TT earth type power distribution facility in which the neutral line side of a transformer secondary winding is earthed and the earth electrode of the earthing-type wall socket is earthed on the loaded side of an electric line, the voltage aspect between a voltage electrode and the neutral electrode or between the voltage electrode and the earth electrode is measured in two states when a voltage is impressed between the neutral electrode and the earth electrode of the earthing-type wall socket and when it is not impressed. Connection polarities of the neutral electrode and the earth electrode of the socket to wiring is checked by the comparison of measurement results in the method and an apparatus for checking the connection of the earthing-type wall socket. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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.

In addition, Patent Documents 2 and 3 show that not only the connection of the grounding electrode but also the connection of the neutral electrode and the grounding electrode is incorrect (the neutral phase is grounded to the grounding 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 where a grounded pole outlet is connected to the load side of the 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 When the impedance is temporarily inserted between the connection parts of the dedicated lines, and the voltage pole and neutral pole of the outlet are connected via the impedance of the same value between the voltage pole and the ground pole, the magnitude of the current that flows Thus, the present invention provides a wiring connection check method and apparatus for an outlet with a grounding electrode, characterized in that the polarity of the connection between the neutral pole and the grounding electrode of the outlet is checked.

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 pole, an impedance is temporarily inserted between the grounding terminal of the distribution board and the ground, and the same voltage between the voltage pole and the neutral pole and between the voltage pole and the grounding pole. 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 the grounding pole of the outlet by comparing the magnitude of the flowing current when connected via a value impedance And an apparatus.

According to a third aspect of the present invention, in the TT grounding type distribution facility in which the neutral wire side of the transformer secondary winding is grounded and the ground electrode of the outlet with the ground electrode is grounded on the load side of the circuit, the outlet with the ground electrode is provided. Measure the voltage aspect between the voltage electrode and the neutral electrode or between the voltage electrode and the earth electrode in two states, when the voltage is applied between the neutral electrode and the earth electrode, and compare the measurement results. The present invention provides a wiring connection checking method and apparatus for an outlet with a grounding electrode, characterized in that the polarity of connection between a neutral electrode and a grounding electrode is checked.

In claim 4, 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 a distribution facility with a grounding outlet connected to the ground, temporarily connect the impedance between the transformer side end of the grounding dedicated line and the connection between the grounding dedicated lines at the connection point in the middle of the grounding dedicated line. Measure the voltage aspect between the voltage electrode and neutral electrode, or between the voltage electrode and the earth electrode, with and without voltage applied between the neutral electrode and the earth electrode of the outlet with the earth electrode. The present invention provides a wiring connection checking method and apparatus for an outlet with a grounding electrode, characterized in that the polarity of connection between the neutral pole and the grounding electrode of the outlet is checked by comparing the measurement results.

In claim 5, 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 to 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 and apparatus for an outlet with a grounding electrode is provided.

According to the invention of claim 1, a TN grounding distribution system in which the neutral wire side of the secondary winding of the transformer is grounded, and at the same time, a dedicated grounding wire is wired from the end of the neutral wire to the load side. However, by temporarily inserting an impedance between the transformer-side end of the ground dedicated line and the neutral dedicated line or between the ground dedicated lines at the connection point in the middle of the ground dedicated line, Since the impedance difference can be given to the sex wire, the magnitude of the current that flows 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 ground pole is compared. This makes it easy to check the polarity of the connection between the neutral pole and ground pole of the outlet.

According to the invention of claim 2, in the TT grounding distribution system in which 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. Even when 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 difference in impedance between the neutral line and the grounding line is increased. Therefore, 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 neutrality of the outlet is compared by comparing the magnitude of the current that flows. It is possible to easily check the polarity of the connection between the pole and the ground pole.

According to the invention of claim 3, in the TT grounding distribution system in which the neutral wire side of the transformer secondary winding is grounded and the grounding electrode of the outlet with the grounding electrode is grounded on the load side of the circuit, Measured and compared the voltage aspect between the voltage pole and neutral pole or between the voltage pole and ground pole when voltage is applied between the neutral pole and ground pole of the outlet with and without voltage. Therefore, if the wiring connection to each pole of the outlet is correct, there will be no change between when the voltage is applied to the neutral and ground 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, the neutral line side of the secondary winding of the transformer is grounded, and at the same time, the ground dedicated line is connected to the load side from the transformer side end of the neutral line to the load side. In a TN grounding distribution system connected to an outlet with a grounding electrode, the impedance between the transformer-side end of the grounding dedicated line and the connection between the grounding dedicated lines at the connection point in the middle of the grounding dedicated line Is temporarily inserted, an impedance is generated on the side of the grounding dedicated line, and the polarity of the connection between the neutral pole and the grounding pole of the outlet can be easily checked using the same method and apparatus as the invention of claim 3. be able to.

According to the invention of claim 5, the neutral wire side of the secondary winding of the transformer is grounded, and at the same time, the grounding terminal is connected to the terminal of the distribution system in which the grounding terminal of the distribution board arranged on the load side of the electric circuit is grounded. In a TN grounding distribution system with an attached outlet, an impedance is temporarily inserted between the grounding terminal of the distribution board and the ground, so the ground resistance of the neutral line on the power supply side transformer and the load side Since the apparent ground resistance can be increased even when the ground resistance of the ground on the board is low, the neutral and ground poles of the outlet are connected to the wiring using the same method and apparatus as the invention of claim 3. The polarity can be easily 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 the method and apparatus according to claim 1 of the present invention, which 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 and 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 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 line 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, an embodiment of the invention of claim 3 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 4 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. 1 is simply replaced with 11, and an impedance 8 or 8 'is temporarily inserted into the dedicated ground line 4 in the same manner as in FIG. 7 wiring connection polarity can be checked.

Next, an embodiment of claim 5 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 grounding wire 4 as in the case of 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 a 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 Figure of embodiment of claim 3 Figure of embodiment of claim 4 Figure of embodiment of claim 5

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transformer 2 Voltage line 3 Neutral line 4 Ground line 5 Transformer ground 6 Relay connection device, such as a distribution board 7, Outlet 8,8 ', 8 "with an earthing pole 9 Temporary insertion impedance 9 Outlet side check device 10 Grounding on distribution board side 11 Check device on outlet side

Claims (5)

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, temporarily insert an impedance between the transformer-side end of the dedicated ground line and the connection of the dedicated ground line between the neutral line or the connection point in the middle of the dedicated ground 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 A method and apparatus for checking the wiring connection of an outlet with a grounding electrode, wherein the polarity is checked. 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, an impedance is temporarily inserted between the grounding terminal of the distribution board and the ground, and between the voltage pole and the neutral pole of the outlet, and between the voltage pole and the grounding pole via the same value impedance. A method and apparatus for checking the connection of a grounded outlet with a grounding electrode, wherein the polarity of the flowing current is compared to check the connection polarity of the outlet's neutral and grounding poles to the wiring. In the TT grounding type distribution facility in which the neutral wire side of the transformer secondary winding is grounded and the ground electrode of the outlet with the ground electrode is grounded on the load side of the circuit, the neutral electrode and the ground of the outlet with the ground electrode are grounded. The voltage aspect between the voltage pole and neutral pole or between the voltage pole and grounding pole is measured in two states, when voltage is applied between the poles and when the voltage is applied between the poles. A method and an apparatus for checking wiring connection of an outlet with a grounding electrode, wherein the polarity of connection to the wiring is checked. 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, an impedance is temporarily inserted between the transformer-side end of the ground dedicated line and the connection between the ground dedicated lines at the connection point between the neutral line and the ground dedicated line, and the ground electrode 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, and compare the measurement results. A wiring connection check method and apparatus for an outlet with a ground electrode, wherein the polarity of the connection between the neutral pole and the ground electrode of the outlet is checked. 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 the neutral electrode or between the voltage electrode and the earth electrode, and checking the connection polarity to the wiring between the neutral electrode and the earth electrode of the outlet by comparing the measurement results Wire connection check method and device for outlets with plugs.

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