JPS58195224A - Detector for power supply equipment - Google Patents

Abstract

PURPOSE:To detect the connection miss of an earth line in a power supply equipment of an electronic device, by detecting the voltage drop due to the sum of an earth resistance of a protective earth electrode and an earth resistance of a grounded electrode. CONSTITUTION:On a switch board 27, a protective earth line 14 and a grounded electric wire 13 are connected erroneously to a grounded electrode 4 and a protective earth electrode 5, respectively. When a detector 1 is connected to a receptacle 17 in this state, a load 7 is added by the operation of a switch circuit 6, and a current is flowed to earth resistances 15 and 16. Therefore, a potential difference is generated between the electric wire 13 and the protective earth line 14 by the voltage drop due to earth resistances 15 and 16. This potential difference is detected by a voltage detecting circuit 8 of the detector 1 to detect the erroneous connection on the switch-board 27. Thus, the connection miss of the earth line in the power supply equipment of the electronic device is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention The present invention relates to a power supply equipment detector for inspecting the proper connection of a ground electrode of a power supply distribution equipment for a single device.

Conventional technology: In power supply equipment for sub-lids, generally one line is grounded.
It is equipped with a pole and a safety ground pole.

In addition, even in the case of electronic devices, terminal devices, which often have a power supply terminal and a safety ground terminal, receive power from an outlet with a ground terminal, etc., at the power receiving part. Due to a mistake, the safety grounding electrode and the grounded power supply electrode may be swapped, which is difficult to detect, especially in small terminals. Conventionally, when installing a terminal, a tester,
In addition, we checked continuity with other equipment, but all we could find was a misconnection between the ground electrode and power source electrode.

Purpose of the Invention The purpose of the present invention is to detect the ground resistance of the safety ground electrode and the grounded power supply terminal in order to determine the incorrect connection between the safety ground electrode and the grounded power supply electrode, which has been difficult with conventional methods, in power supply equipment. Another object of the present invention is to provide a detector for detecting a voltage drop consisting of the sum of ground resistances of electrodes.

In power distribution equipment for electronic devices, if the device is connected with the safety ground electrode and the grounded electrode swapped, the input current of the device flows through the safety ground electrode, and the safety ground line and earth and return to the grounded power line. At this time, a voltage drop corresponding to the resistance occurs, and the device input voltage decreases. The solution was to detect this in advance before connecting the device.

Examples of the invention FIG. 1 is a conceptual diagram of a single-phase grounding detector 1.

2 is connected to the power receiving terminal or plug of the electronic device, and 1 is connected to the terminal t* (outlet) of the source equipment.

The electrode 3 is a single-phase single pole, and a switch circuit 6 and a load circuit 7 are connected to this line to the other electrode 4 which is grounded. A voltage detection circuit 8 is connected between this electrode 4 and the safety ground electrode 5.

FIG. 2 is a diagram in which the heavy equipment 1 shown in FIG. 1 is connected to power distribution equipment. 9 is a □ primary circuit for high voltage, etc., and a low voltage secondary circuit 11 is connected by a transformer 10.
′ is obtained. 12.15 is the power line □, and the electric wire 15 is connected to the grounding resistor 15)fII! It is grounded. The safety grounding wire 14 is grounded by a grounding resistor 16. A device terminal board or outlet 17 is provided for the electronic device and each electrode is defined. In the switchboard 26, the grounded electric wire 15 and the electrode 4, the safety grounding wire 14 and the grounding electrode 5 are connected correctly, and even if the detector 1 is connected and the load 7 is connected to the switch circuit, the voltage is The detection circuit 8 does not detect the voltage difference generated by the switch circuit operation.

Furthermore, in the switchboard 27, the safety ground Ia14 is grounded and connected to the nine electrodes 4, and the grounded electric wire 15 is erroneously connected to the safety ground Ii5. In the outlet 17 in such a state,
When the detector 1 is connected and the load 7 is applied by the operation of the switch circuit 6, the load 7 is applied to the electric wire 4112 and the safety wire 14, and the electric power ft is applied to the safety ground wire 1.
4 and returns to the grounded electric wire 15 via the grounding resistor 16, the grounding resistor 15, and the secondary of the transformer 1o. In this case, between the electrical wire 15 which is grounded on the ground and the safety grounding wire 14, there is a grounding resistance of 15 and 16K.
A potential difference occurs due to the voltage drop. Therefore, since the voltage detection circuit 8 of the detector 1 detects the voltage, it is possible to detect an erroneous connection at the switchboard 27.

FIG. 5 shows an embodiment of the present invention. 21 is a plug with a grounding electrode 20, 22 is a cord, 25 is a 5-stage rotary switch that arbitrarily selects and disconnects the load even if the electrode 18 or 19 is grounded, and 24 is a five-stage rotary switch. The resistor 25 is an AC voltage needle.

Effects of the Invention According to the present invention, by connecting this detector to an outlet or terminal Km before installing an electronic device, it is possible to find a grounding wire connection error on the equipment side and ensure the safety of the electronic device. Additionally, combiator terminals can ensure not only safety but also reliability.

[Brief explanation of drawings]

Figure 1 is a conceptual diagram of the detector, Figure 2 shows a power distribution board with an incorrect grounding wire connected to the power supply equipment, and a normal power distribution board. 1 is a drawing of an embodiment of the invention. 1...Detector 2...Connection part 5...Electrode 4...Ground side electrode 5...Safety ground electrode 6...Switch circuit 7...Load
8...Voltage detection circuit 9...-Next power supply 1
o...Transformer 11...Secondary power supply 12.
・・Power wire 1t・Grounding side power wire 14・・Safety grounding wire 15・・Grounding resistance 16・・Grounding resistance 17・・Terminal board or outlet 18.19・・・Power supply pole 2o・・・Grounding electrode 21
...Plug 22-, Cord 23...Rotary switch 24...Resistance 25...AC voltage needle agent patent attorney thin FE#゛Sachipa 4I t.

Claims (1)

[Claims] 1. In a connection circuit corresponding to the electrodes, which has a structure capable of being connected to power distribution equipment for electronic devices, which has multiple poles of a single-phase or multi-phase power supply with a grounded - line and a safety ground electrode, A power supply equipment detector characterized in that a switch mechanism and a load circuit, each independent or interlocked, are provided between a grounding electrode and another power supply electrode, and a voltage detection circuit is provided between the grounding electrode and a safety grounding electrode.