CN112147538A - Equipment poor grounding alarm circuit, poor grounding alarm device and switch device - Google Patents
Equipment poor grounding alarm circuit, poor grounding alarm device and switch device Download PDFInfo
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- CN112147538A CN112147538A CN202011031831.7A CN202011031831A CN112147538A CN 112147538 A CN112147538 A CN 112147538A CN 202011031831 A CN202011031831 A CN 202011031831A CN 112147538 A CN112147538 A CN 112147538A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- H—ELECTRICITY
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Abstract
The application discloses an equipment poor grounding alarm circuit, a poor grounding alarm device and a switch device, which comprise a first current limiting module and an indicating module, wherein the first current limiting module and the indicating module are connected in series and are connected between a live wire interface of a socket and a ground wire interface of the socket in series, electric equipment is in adaptive insertion connection with the socket, the live wire interface is configured to be connected with a power voltage, the first current limiting module is configured to convert the power voltage into a current when the ground wire interface is connected with the ground, the indicating module is configured to be lightened when the current is received, the indicating module is lightened when the ground wire interface of the socket is effectively connected with the ground, the indicating module is not lightened when the ground wire interface of the socket is not connected with the ground or is not connected with the ground, whether the socket is effectively grounded or not is judged through whether the indicating module is lightened intuitively, the user can avoid electric shock caused by contacting with the electrified electric equipment.
Description
Technical Field
The application belongs to the technical field of equipment grounding detection, and particularly relates to an equipment grounding failure alarm circuit, a grounding failure alarm device and a switch device.
Background
In general, other electronic devices such as a system host (e.g., a common desktop computer) of an electronic product require effective grounding of the device for safe and reliable operation, and are provided with power supply lines requiring three-wire power supply, wherein three wires include a live wire, a zero wire and a ground wire, although specification requirements of the device and a housing of the device are all connected with the ground wire, if a household power supply line is not standardized or power supply is cost-saving, although a three-wire socket is selected as the socket, but the ground wire inside the socket is not connected or grounded reliably, so that the ground wire is not connected with the ground, some devices generate static electricity when the devices are used, and other devices are provided with Y capacitors for electromagnetic compatibility detection (the Y capacitors are safety capacitors respectively bridged between two wires of a power line and the ground), so that certain leakage current can exist to charge the housing of the devices, but people are difficult to detect whether the ground wire of the socket is in poor contact, when the heart is bad or a person with a pacemaker touches the shell, the electric shock can have serious consequences even if the electrified power supply voltage of the shell is low.
Disclosure of Invention
The application aims to provide an equipment grounding failure alarm circuit, and aims to solve the problem that the traditional socket has a problem that the ground wire is not connected or the grounding is unreliable, so that the connected equipment shell is electrified to cause safety accidents.
A first aspect of an embodiment of the present application provides an apparatus poor ground alarm circuit, including a first current limiting module and an indication module;
the first current limiting module and the indicating module are connected in series and are connected between a live wire interface of the socket and a ground wire interface of the socket in series, and the electric equipment is in adaptive plug-in connection with the socket;
the live wire interface is configured to be connected to a power supply voltage;
the first current limiting module is configured to convert the supply voltage to a current when the ground interface is connected to ground;
the indication module is configured to illuminate upon receiving the current.
In one embodiment, the indication module comprises a first light emitting diode, and the first current limiting module comprises a first resistor and a second resistor;
the first end of the first resistor is a power supply voltage input end of the first current limiting module, the second end of the first resistor is connected with the anode of the first light emitting diode, the cathode of the first light emitting diode is connected with the first end of the second resistor, and the second end of the second resistor is connected with the ground wire interface.
In one embodiment, the device grounding fault alarm circuit further comprises a second current limiting module and a third current limiting module;
the second current limiting module and the third current limiting module are connected in series and are connected between the live wire interface and the zero line interface of the socket in series;
the second current limiting module, the indicating module and the first current limiting module are connected in series and are connected between the live wire interface and the ground wire interface in series;
the third current limiting module, the indicating module and the first current limiting module are connected in series and are connected between the zero line interface and the ground wire interface in series.
In one embodiment, the first current limiting module includes a third resistor, the second current limiting module includes a fourth resistor, the third current limiting module includes a fifth resistor, and the indicating module includes a second light emitting diode;
the first end of the fourth resistor is connected with the live wire interface, the second end of the fourth resistor, the anode of the second light-emitting diode and the first end of the fifth resistor are connected together, the cathode of the second light-emitting diode is connected with the first end of the third resistor, the second end of the fifth resistor is connected with the zero line interface, and the second end of the third resistor is connected with the ground wire interface.
A second aspect of the embodiments of the present application provides a poor ground fault alarm device, including the device poor ground fault alarm circuit according to any one of the embodiments of the first aspect.
A third aspect of the embodiments of the present application provides a switching device, including a switching module and the poor ground alarm device according to any one of the embodiments of the second aspect;
the switch module is connected in series between the live wire interface and a power live wire or between the live wire interface and the electric equipment, and is configured to switch on/off the power voltage between the live wire interface and the power live wire according to manual operation or switch on/off the power voltage between the live wire interface and the electric equipment according to manual operation.
In one embodiment, the switch module includes a first switch unit;
the first end of the first switch unit is connected with the live wire interface, and the second end of the first switch unit is connected with the power live wire.
In one embodiment, the switch module further includes a second switch unit;
the first end of the second switch unit is connected with a zero line interface of the socket, and the second end of the second switch is connected with the power supply zero line;
the first switch unit and the second switch unit are connected in an interlocking manner.
In one embodiment, the switch module includes a third switch unit;
the third switch unit, the live wire interface and the electric equipment are connected in series.
In one embodiment, the switch module includes a fourth switch unit;
the fourth switch unit, the zero line interface and the electric equipment are connected in series;
and the third switching unit and the fourth switching unit are connected in a linkage manner.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: when the ground wire interface of the socket is effectively connected with the ground, the power voltage passes through the live wire interface of the socket, the first current limiting module, the indicating module and the ground wire interface flow through the ground, the first current limiting module converts the power voltage into current to enable the indicating module to be lightened, when the ground wire interface of the socket is not connected with the ground or is not well connected with the ground, the power voltage cannot pass through the live wire interface of the socket, the first current limiting module, the indicating module and the ground wire interface flow through the ground, therefore, the indicating module does not have the current to flow through and can not be lightened, the effect of warning that the ground wire of the socket is not effectively grounded is achieved, whether the socket is effectively grounded is judged by directly judging whether the socket is lightened through the indicating module, and a user can avoid electric shock caused by contacting with electrified electric equipment.
Drawings
Fig. 1 is a first exemplary schematic block diagram of a device poor ground alarm circuit according to an embodiment of the present disclosure;
fig. 2 is a first circuit schematic diagram of a device poor ground alarm circuit according to an embodiment of the present disclosure;
fig. 3 is a second exemplary schematic block diagram of a device poor ground alarm circuit according to an embodiment of the present application;
fig. 4 is a second circuit schematic diagram of the device poor ground alarm circuit according to the embodiment of the present application;
fig. 5 is a first exemplary functional block diagram of a switching device provided in an embodiment of the present application;
fig. 6 is a second exemplary functional block diagram of a switching device provided in an embodiment of the present application;
fig. 7 is a first circuit schematic diagram of a switching device according to an embodiment of the present application;
fig. 8 is a second circuit schematic diagram of a switching device provided in an embodiment of the present application;
fig. 9 is a third circuit schematic diagram of a switching device according to an embodiment of the present application;
fig. 10 is a fourth circuit schematic diagram of a switching device according to an embodiment of the present application.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Fig. 1 shows a first schematic block diagram of a device poor ground alarm circuit provided in an embodiment of the present application, and for convenience of description, only the parts related to the embodiment are shown, and the details are as follows:
an equipment poor grounding alarm circuit comprises a first current limiting module 200 and an indicating module 300;
the first current limiting module 200 and the indicating module 300 are connected in series and are connected in series between the live wire interface 110 of the socket 100 and the ground wire interface 120 of the socket 100, and the electric equipment 800 is in adaptive plug-in connection with the socket 100;
the firewire interface 110 is configured to switch in a supply voltage;
the first current limiting module 200 is configured to convert a supply voltage into a current when the ground interface 120 is connected to ground;
the indication module 300 is configured to light up upon receiving a current.
In this embodiment, when the ground interface 120 of the socket 100 is effectively connected to the ground, the power voltage flows to the ground through the fire wire interface 110, the first current limiting module 200, the indicating module 300 and the ground interface 120 of the socket 100, the first current limiting module 200 converts the power voltage into current to light the indicating module 300, the indicating module 300 lights the fire wire interface 110 representing that the socket 100 is reliably connected to the ground, when the ground interface 120 of the socket 100 is not connected to the ground or is poorly connected to the ground, the power voltage cannot flow to the ground through the fire wire interface 110, the first current limiting module 200, the indicating module 300 and the ground interface 120 of the socket 100, so that no current flows through the indicating module 300 and cannot light, the indicating module 300 does not light to alert that the ground wire of the socket 100 is not effectively grounded, visually judge whether the socket 100 is effectively grounded by whether the indicating module 300 lights to judge whether the power-using device 800 plugged in the socket 100 is effectively grounded, the user can avoid electric shock caused by contacting the electrified electric equipment 800.
The live wire interface 110 of the socket 100, the ground wire interface 120 of the socket 100, and the neutral wire interface 130 of the socket 100 refer to interfaces of the electric device 800 plugged in the socket 100, so that when the socket 100 is not connected to the ground or is not connected to the ground well, the ground wire interface 120 cannot form a current path with the ground, and the first current limiting module 200 can reduce energy consumption of the alarm circuit for poor ground connection of the device; the first current limiting module 200 may be formed by a single resistor, a plurality of resistors connected in series, a plurality of resistors connected in parallel, or a plurality of resistors connected in series and parallel, the indicating module 300 may be formed by a light emitting diode or an LED lamp, etc., and the specific structures of the first current limiting module 200 and the indicating module 300 are designed by those skilled in the art according to actual needs, and are not limited herein.
Referring to fig. 2, in an embodiment, the indication module 300 includes a first light emitting diode D1, and the first current limiting module 200 includes a first resistor R1 and a second resistor R2;
a first end of the first resistor R1 is a power voltage input end of the first current limiting module 200, a second end of the first resistor R1 is connected to an anode of the first light emitting diode D1, a cathode of the first light emitting diode D1 is connected to a first end of the second resistor R2, and a second end of the second resistor R2 is connected to the ground interface 120.
In this embodiment, under the condition that the ground interface 120 is effectively grounded, the power voltage is converted into a low current under the action of the first resistor R1 and the second resistor R2, the low current flows through the first light emitting diode D1 to make the first light emitting diode D1 illuminate, wherein the power voltage is an ac voltage, so that the first light emitting diode D1 actually illuminates only when the ac voltage is in a positive half-wave, and in addition, by setting the first resistor R1 and the second resistor R2 as two current limiting resistors, the damage to the first light emitting diode D1 caused by too much current increase after one of the resistors is damaged is effectively avoided.
Referring to fig. 3, in an embodiment, the device grounding fault alarm circuit further includes a second current limiting module 500 and a third current limiting module 600;
the second current limiting module 500 and the third current limiting module 600 are connected in series and in series between the live wire interface 110 and the neutral wire interface 130 of the socket 100;
the second current limiting module 500, the indicating module 300 and the first current limiting module 200 are connected in series and are connected in series between the live wire interface 110 and the ground wire interface 120;
the third current limiting module 600, the indicating module 300, and the first current limiting module 200 are connected in series and between the neutral wire interface 130 and the ground wire interface 120.
In this embodiment, when an operator connects the neutral line interface 130 of the socket 100 and the live line interface 110 of the socket 100 to the power source in the opposite direction during the construction process, that is, the actual condition is that the neutral line interface 130 inputs the power voltage rather than the live line interface 110, the power voltage flows through the ground through the neutral line interface 130, the third current limiting module 600, the indicating module 300, the first current limiting module 200 and the ground line interface 120 in sequence, so that the indicating module 300 is turned on.
Under normal conditions, when the neutral wire interface 130 of the socket 100 and the live wire interface 110 of the socket 100 are connected with the power supply, the power voltage flows through the ground through the live wire interface 110, the second current limiting module 500, the indicating module 300, the first current limiting module 200 and the ground wire interface 120 in sequence, so that the indicating module 300 is turned on, and whether the socket 100 is effectively grounded or not can be displayed through the live wire indicating module 300 when the neutral wire interface 130 of the socket 100 and the live wire interface 110 of the socket 100 are connected with the power supply in the positive and negative directions.
If the zero line interface 130 is not serially connected to the ground line interface 120 through the third current limiting module 600, the indicating module 300, and the first current limiting module 200, and only the live line interface 110 is serially connected to the ground line interface 120 through the second current limiting module 500, the indicating module 300, and the first current limiting module 200, when the zero line interface 130 of the receptacle 100 and the live line interface 110 of the receptacle 100 are reversely connected to the power supply, that is, when the zero line interface 130 inputs the power supply voltage, the ground line interface 120 is effectively grounded, and the voltage at the two ends of the indicating module 300 cannot light the indicating module 300.
The second current limiting module 500 and the third current limiting module 600 may be formed by a single resistor, a plurality of resistors connected in series, a plurality of resistors connected in parallel, or a plurality of resistors connected in series and parallel, and the specific structures of the second current limiting module 500 and the third current limiting module 600 are designed by those skilled in the art according to actual needs, and are not limited herein.
Referring to fig. 4, in an embodiment, the first current limiting module 200 includes a third resistor R3, the second current limiting module 500 includes a fourth resistor R4, the third current limiting module 600 includes a fifth resistor R5, and the indicating module 300 includes a second light emitting diode D2;
the first end of the fourth resistor R4 is connected with the live wire interface 110, the second end of the fourth resistor R4, the anode of the second light emitting diode D2 and the first end of the fifth resistor R5 are connected together, the cathode of the second light emitting diode D2 is connected with the first end of the third resistor R3, the second end of the fifth resistor R5 is connected with the neutral wire interface 130, and the second end of the third resistor R3 is connected with the ground wire interface 120.
In this embodiment, when the neutral wire interface 130 of the socket 100 and the hot wire interface 110 of the socket 100 are connected to the power supply, the first end of the fourth resistor R4 is a power voltage input end, and when the ground wire interface 120 is effectively grounded, the power voltage sequentially flows to the ground wire interface 120 through the fourth resistor R4, the second light emitting diode D2 and the third resistor R3 to illuminate the second light emitting diode D2; when the neutral wire interface 130 of the receptacle 100 and the hot wire interface 110 of the receptacle 100 are reversely connected to the power supply, the second end of the fifth resistor R5 is a power voltage input end, and when the ground wire interface 120 is effectively grounded, the power voltage sequentially flows to the ground wire interface 120 through the fifth resistor R5, the second light emitting diode D2 and the third resistor R3, so that the second light emitting diode D2 lights.
The embodiment of the present application further provides a poor grounding alarm device, including the device poor grounding alarm circuit according to any of the above embodiments, wherein the specific structure of the device poor grounding alarm circuit refers to the above embodiments, and since the device adopts all the technical solutions of all the above embodiments, the device at least has all the beneficial effects brought by the technical solutions of the above embodiments, and details are not repeated herein.
Referring to fig. 5 and fig. 6, an embodiment of the present application further provides a switching device, which includes a switch module 700 and a poor ground alarm device according to any one of the above embodiments;
the switch module is connected in series between the live wire interface and the live power wire or between the live wire interface and the electric equipment 800, and is configured to switch on/off the power voltage between the live wire interface and the live power wire according to manual operation or switch on/off the power voltage between the live wire interface and the electric equipment 800 according to manual operation.
The switch module 700 is connected in series between the live wire interface 110 and the power live wire 400 or between the live wire interface 110 and the electric device 800, and is configured to switch on/off the power voltage between the live wire interface 110 and the power live wire 400 according to a manual operation or switch on/off the power voltage between the live wire interface 110 and the electric device 800 according to a manual operation.
The specific structure of the alarm device for poor grounding refers to the above embodiments, and since the switch device adopts all the technical solutions of all the above embodiments, all the beneficial effects brought by the technical solutions of the above embodiments are at least achieved, and are not described in detail herein.
In this embodiment, the switch module 700 is connected in series between the live wire interface 110 and the power live wire 400, and the power voltage between the power live wire 400 and the live wire interface 110 can be switched on and off by manually operating the switch module 700, so as to control whether the socket 100 is electrified or not, thereby facilitating the control of the socket 100; switch module 700 concatenates between live wire interface 110 and consumer 800, can break-make the mains voltage between live wire interface 110 and the consumer 800 through manual operation switch module 700 to whether control is for the power supply of consumer 800, be convenient for to the control of consumer 800, in addition with the bad device of ground connection and switch module 700 integration at switching device, so that through switching device to the bad ground connection warning upgrading transformation of socket 100 more simple and convenient.
Referring to fig. 7, in an embodiment, a switch module 700 includes a first switch unit K1;
the first end of the first switch unit K1 is connected to the hot wire interface 110, and the second end of the first switch unit K1 is connected to the hot wire power supply 400.
In the present embodiment, the first switch unit K1 is manually operated to switch the power voltage between the live wire interface 110 and the live wire power supply 400.
Referring to fig. 8, in an embodiment, the switch module 700 further includes a second switch unit K2;
a first end of the second switch unit K2 is connected with the neutral wire interface 130 of the socket 100, and a second end of the second switch is connected with the power supply neutral wire;
the first switch unit K1 and the second switch unit K2 are linked.
Wherein the first switch unit K1 and the second switch unit K2 may constitute a two-pole switch.
In this embodiment, the first switch unit K1 and the second switch unit K2 respectively control on/off between the live wire interface 110 and the live wire 400 of the power supply and on/off between the zero wire interface 130 and the zero wire of the power supply, so that the power supply voltage input to the socket 100 can be effectively cut off when the live wire interface 110 and the zero wire interface 130 are reversely connected to the power supply, thereby improving the control effect of the switch module 700 on the socket 100 and improving the safety of the socket 100.
Referring to fig. 9, in an embodiment, the switch module 700 includes a third switch unit K3;
the third switching unit 700, the fire wire interface 110 and the electric device 800 are connected in series.
In the present embodiment, switching on and off of the power supply voltage between the live wire interface 110 and the electric equipment 800 by manually operating the third switching unit K3 functions to control the supply of power to the electric equipment 800.
Referring to fig. 10, in an embodiment, the switch module includes a fourth switch unit;
the fourth switching unit K4, the zero line interface 130 and the electric equipment 800 are connected in series;
the third switching unit K3 and the fourth switching unit K4 are linked.
In this embodiment, the third switching unit K3 and the fourth switching unit K4 respectively control on/off between the live wire interface 110 and the electric equipment 800 and on/off between the neutral wire interface 130 and the electric equipment 800, and when the live wire interface 110 and the neutral wire interface 130 are reversely connected to the power supply, the power supply voltage output from the socket 100 to the electric equipment 800 can also be effectively cut off, so as to improve the control effect of the switching module 700 on the electric equipment 800.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. The equipment poor grounding alarm circuit is characterized by comprising a first current limiting module and an indicating module;
the first current limiting module and the indicating module are connected in series and are connected between a live wire interface of the socket and a ground wire interface of the socket in series, and the electric equipment is in adaptive plug-in connection with the socket;
the live wire interface is configured to be connected to a power supply voltage;
the first current limiting module is configured to convert the supply voltage to a current when the ground interface is connected to ground;
the indication module is configured to illuminate upon receiving the current.
2. The device poor ground alarm circuit of claim 1, wherein the indication module comprises a first light emitting diode, and the first current limiting module comprises a first resistor and a second resistor;
the first end of the first resistor is a power supply voltage input end of the first current limiting module, the second end of the first resistor is connected with the anode of the first light emitting diode, the cathode of the first light emitting diode is connected with the first end of the second resistor, and the second end of the second resistor is connected with the ground wire interface.
3. The device poor ground alarm circuit of claim 1, further comprising a second current limiting module and a third current limiting module;
the second current limiting module and the third current limiting module are connected in series and are connected between the live wire interface and the zero line interface of the socket in series;
the second current limiting module, the indicating module and the first current limiting module are connected in series and are connected between the live wire interface and the ground wire interface in series;
the third current limiting module, the indicating module and the first current limiting module are connected in series and are connected between the zero line interface and the ground wire interface in series.
4. The device poor ground alarm circuit of claim 3, wherein the first current limiting module comprises a third resistor, the second current limiting module comprises a fourth resistor, the third current limiting module comprises a fifth resistor, and the indicating module comprises a second light emitting diode;
the first end of the fourth resistor is connected with the live wire interface, the second end of the fourth resistor, the anode of the second light-emitting diode and the first end of the fifth resistor are connected together, the cathode of the second light-emitting diode is connected with the first end of the third resistor, the second end of the fifth resistor is connected with the zero line interface, and the second end of the third resistor is connected with the ground wire interface.
5. An apparatus for alarming poor grounding, comprising the circuit for alarming poor grounding of the device according to any one of claims 1 to 4.
6. A switchgear comprising a switching module and a bad grounding alarm device according to claim 5;
the switch module is connected in series between the live wire interface and a power live wire or between the live wire interface and the electric equipment, and is configured to switch on/off the power voltage between the live wire interface and the power live wire according to manual operation or switch on/off the power voltage between the live wire interface and the electric equipment according to manual operation.
7. The switching device of claim 6, wherein the switch module comprises a first switch unit;
the first end of the first switch unit is connected with the live wire interface, and the second end of the first switch unit is connected with the power live wire.
8. The switching device of claim 7, wherein the switch module further comprises a second switch unit;
the first end of the second switch unit is connected with a zero line interface of the socket, and the second end of the second switch is connected with the power supply zero line;
the first switch unit and the second switch unit are connected in an interlocking manner.
9. The switching device of claim 6, wherein the switching module includes a third switching unit;
the third switch unit, the live wire interface and the electric equipment are connected in series.
10. The switching device of claim 9, wherein the switching module includes a fourth switching unit;
the fourth switch unit, the zero line interface and the electric equipment are connected in series;
and the third switching unit and the fourth switching unit are connected in a linkage manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011031831.7A CN112147538A (en) | 2020-09-27 | 2020-09-27 | Equipment poor grounding alarm circuit, poor grounding alarm device and switch device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011031831.7A CN112147538A (en) | 2020-09-27 | 2020-09-27 | Equipment poor grounding alarm circuit, poor grounding alarm device and switch device |
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| CN112147538A true CN112147538A (en) | 2020-12-29 |
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| CN202011031831.7A Pending CN112147538A (en) | 2020-09-27 | 2020-09-27 | Equipment poor grounding alarm circuit, poor grounding alarm device and switch device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113341267A (en) * | 2021-04-13 | 2021-09-03 | 国网河南省电力公司郑州供电公司 | Safety analysis method for transformation of neutral point grounding mode of power distribution network |
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| CN105572521A (en) * | 2014-10-09 | 2016-05-11 | 苏州益而益电器制造有限公司 | Ground wire live-line detection display circuit and electric device |
| CN205280860U (en) * | 2015-11-30 | 2016-06-01 | 余姚市嘉荣电子电器有限公司 | Unusual indicating circuit of ground connection |
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| CN106501663A (en) * | 2016-10-19 | 2017-03-15 | 广东盈科电子有限公司 | A kind of detection exchange ground wire connection whether good method |
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| CN207051411U (en) * | 2017-03-22 | 2018-02-27 | 深圳市景创科技电子有限公司 | A kind of ground line detection circuit and ground line testing device |
| CN108519535A (en) * | 2018-06-08 | 2018-09-11 | 徐畅 | A kind of detection method of single-phase three-wire formula wall socket ground wire, zero curve and phase line |
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| CN113341267A (en) * | 2021-04-13 | 2021-09-03 | 国网河南省电力公司郑州供电公司 | Safety analysis method for transformation of neutral point grounding mode of power distribution network |
| CN113341267B (en) * | 2021-04-13 | 2022-03-04 | 国网河南省电力公司郑州供电公司 | Safety analysis method for transformation of neutral point grounding mode of power distribution network |
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