A leakage current detection device which includes a switching unit for controlling electrical connection between an input end and an output end; a leakage current detection unit, including a plurality of current carrier wires and at least one leakage current detection wire, the leakage current detection wire being configured to detect whether a leakage current exists in any one of the plurality of current carrier wires; and a temperature monitoring unit, including at least one temperature-sensitive resistive element disposed at a temperature monitoring location, the temperature-sensitive resistive element being coupled to the switching unit via the leakage current detection wire and controlling the switching unit based on a temperature at the temperature monitoring location. By providing the temperature monitoring circuit, the leakage current protection device can prevent the appliance form being in a high temperature condition for prolonged time period, greatly improving safety of the appliance.

A distributed power supply that enables a user to easily determine whether or not a ground fault that has occurred is a received ground fault when a ground fault occurs is provided. A distributed power supply connected to a single-phase three-wire distribution line includes a power generation device, an alternating current generation circuit that generates an alternating current to be supplied between a W-phase wire and a U-phase wire of the single-phase three-wire distribution line on the basis of an output of the power generation device, a ground voltage detection circuit that detects a ground voltage of a non-grounded portion in the alternating current generation circuit, and an output part that outputs detection result information indicating a detection result of the ground voltage of the ground voltage detection circuit.

A power cord includes an outer coating layer. Live, neutral, and ground wires are in the outer coating layer. The live wire includes a core and first insulation layer. Live wire shielding and second insulation layers are successively sheathed outside the core. The neutral wire includes a core and first insulation layer. Neutral wire shielding and second insulation layers are successively outside the neutral wire core. The ground wire includes a core and insulation layer sheathed outside the ground wire core. When the live and neutral wire shielding layers are broken or the live wire and its shielding layer are short-circuited, and the neutral wire and its shielding layer are short-circuited, the leakage protector detects an abnormal signal of the power cord and interrupts the electrical connection of the live and neutral wires, to prevent fire between the live and neutral wire cores after the power cord is broken.

A vehicle may include an inverter including a tristate buffer. The vehicle may further include a short detection circuit connected to the inverter configured to output an inhibit signal indicative of abnormal electrical behavior to the tristate buffer such that inverter output is disabled. The short detection circuit may out the inhibit signal in response to a high value comparator signal indicating deviation from a high voltage threshold or a low value comparator signal indicating deviation from a ground voltage.

A leakage protection method and device with live/neutral wire identification that identify live wire and neutral wire of a power supply by means of a live/neutral wire identification device, and correct live/neutral wire connections, so that a surface leakage signal pickup device is always connected to the neutral wire and to surface of the electric device, and electric potential of the surface is always monitored over the neutral wire. When the Surface leaks electricity, the leakage signal pickup device immediately drives an electromagnetic tripping device to break a main circuit switch, thereby breaking the connection between the electric device and the power source. The method and device work effectively even when the electric device is not grounded.

A leakage protection method and device with live/neutral wire identification that identify live wire and neutral wire of a power supply by means of a live/neutral wire identification device, and correct live/neutral wire connections, so that a surface leakage signal pickup device is always connected to the neutral wire and to surface of the electric device, and electric potential of the surface is always monitored over the neutral wire. When the Surface leaks electricity, the leakage signal pickup device immediately drives an electromagnetic tripping device to break a main circuit switch, thereby breaking the connection between the electric device and the power source. The method and device work effectively even when the electric device is not grounded.

A marine protection circuit includes a first terminal connectable to a ground connection of a marine vessel or a waterborne object and a second terminal connectable to a ground connection of an on-shore power supply. The marine protection circuit is configured to engage when a voltage across the first and the second terminals is above a threshold value. The marine protection circuit is configured to present low resistance between the first and the second terminals when engaged. The marine protection is configured to present high resistance between the first and the second terminals when unengaged.

Disclosed in the present invention are a method of electricity leakage detection and prevention of electrical equipment's outer surface and system thereof. The method and system are used for detecting and preventing electricity leakage of the electrical equipment's outer surface caused by defective insulation and power supply connection faults. Without in touch with the electrical equipment's outer surface, the electricity leakage of the outer surface can be detected and the connection between the electrical equipment and the power supply can be cut and an alarm is made by means of the current channel (2) formed between the electrical equipment neutral line (N) and the electrical equipment's outer surface (G) and the monitoring of the current value. A power supply channel (5) is set up to make sure that the electrical equipment can be normally operated via the system even in the condition of the power supply connection faults. According to the method and system, the electricity leakage of the outer surface can be correctly detected and the alarm can be made or the connection between the electrical equipment and the power supply can be cut even if the electrical equipment's outer surface is not grounded. With the advantage of simple construction and low cost, the system can be widely used.

Disclosed in the present invention are a method of electricity leakage detection and prevention of electrical equipment's outer surface and system thereof. The method and system are used for detecting and preventing electricity leakage of the electrical equipment's outer surface caused by defective insulation and power supply connection faults. Without in touch with the electrical equipment's outer surface, the electricity leakage of the outer surface can be detected and the connection between the electrical equipment and the power supply can be cut and an alarm is made by means of the current channel (2) formed between the electrical equipment neutral line (N) and the electrical equipment's outer surface (G) and the monitoring of the current value. A power supply channel (5) is set up to make sure that the electrical equipment can be normally operated via the system even in the condition of the power supply connection faults. According to the method and system, the electricity leakage of the outer surface can be correctly detected and the alarm can be made or the connection between the electrical equipment and the power supply can be cut even if the electrical equipment's outer surface is not grounded. With the advantage of simple construction and low cost, the system can be widely used.

A method for diagnosing leakage of electronic parts and servicing guide of a driving state for a vehicle in a battery management system is provided. The method includes normally driving the vehicle or stopping the vehicle by cutting off a relay based on whether electronic parts broken due to insulation resistance breakdown are required for the driving of the vehicle. In addition, the method includes services a guide required for each broken electronic part about a driving state of the vehicle, by stepwise measuring insulation resistance of vehicle key on, engine starting, an operation of load parts such as a driving motor in the vehicle, an air conditioner, and a low-voltage DC-DC converter, and the like.