Introduction to solar energy lamps and lanterns of leakage current test

In physics, the leakage current can be defined as from live parts ( Through the insulation) The current flow to the conductive parts.

a preliminary conclusion, the leakage current effect research

1, from the study of the leakage current effect of two conclusions.

　　（ 1) In terms of safety, main consideration may be harmful current flows through the human body, not necessarily equal to the current through the protective conductor of electric current.

　　（ 2) Current effect on the human body than earlier in the standard assumption of several want to consider the effect of more complex, to ensure the safety of the continuous waveform condition limit, the most important effect of four types: a, perception; B, reaction; C, get rid of; D, the electric burns. These four one effect of the human body has the only threshold, but some of these threshold value with the change of frequency difference is very big. Electrical burns is due to the current flow through or through the skin and cause skin or organs of burns.

2, according to the different measuring methods for the definition of two kinds of current leakage current measurement method is included in the normal condition and some failure under the condition of the physiological effect and installations of the current measurement method. There are two kinds of leakage current of current: contact current and protect the conductor current.

IEC61140:1997 'electric shock - proof Public facilities and equipment aspects. 3. Article 9 the contact current is defined as 'when in normal condition or fault condition, human or animal body contact electrical equipment or facilities of one or more a part of, (current through the human or animal body A similar definition also see IEC60990) 。 'Contact current ( Only when the human body is the current channel) Can also be defined as the inflow represents the impedance of the human body the current of the network. Protection conductor current is defined as using resistance negligible current meter measurement to protect the current in the conductor. Protection conductor current is the leakage current in the device grounding wires. Protection of connection in the same circuit conductor current RCD ( Residual current protective device) Work may be affected, therefore the protection conductor current test one purpose can choose according to protection conductor current residual current protection device.

IEC364 - another purpose 7 - Electrical equipment - 707 'building - part 7: special facilities or places Chapter 707: grounding requirements '707th of a data processing equipment installation. 471. 3. 3 'leakage current is greater than 10 ma to go further by calling for a' needs. The standard of the leakage current in excess of the prescribed limit will make high leakage current, for a device with high leakage current have additional requirements of protection against electric shock. The standard of more than 10 ma leakage current as high leakage current. For more than 10 ma, the leakage current, equipment should be carried out in accordance with the a that could satisfy the requirement of the following three connections.

　　（ 1) Complete protection ( Ground) The line. The purpose of these requirements using solid or double conductors and permanent fittings or solid connectors, in order to provide complete protection circuit. Protection conductor if it is used in the single conductor cross-sectional area shall be not less than 10 was, if is two conductors separate termination, each conductor cross-sectional area should not be less than 4 was.

　　（ 2) Continuous monitoring. The continuity of these requirements is the purpose of monitoring sites link, provide the failure cases, cut off the power supply device.

　　（ 3) Using double winding transformer. Limit the access of the leakage current, the purpose of these requirements and the continuity interrupt may reduce to a minimum. Two current can be explained in the following figure 1. Because the protection conductor current depends on the impedance of the equipment, IEC TC64 for standardization of impedance measurement has been developed. However, the impedance assumption is not greater than 0. 5Ω。 In addition, the current is only for the consumers to connect to the power supply ( For example, in your house with a plug connection) The lamps and lanterns is important. IEC TC64 believe that the current for connection to the socket is important to all of the products. Due to measurement during the type testing of lamps and lanterns is protection conductor current has a limit, IEC TC64 does not consider connected to the same RCD ( Residual current protective device) The number of products is an important fact. To permanently connected to the power of 'big' lamps and lanterns, may need to have the measurement, if protection conductor current more than 10 ma, lamps and lanterns should have the corresponding warning label ( See a / 64/1120 CDV file) 。

2, the requirements of the leakage current depends on the insulation class of lamps and lanterns Ⅰ class of lamps and lanterns: require contact with current and protect the conductor current measurement.

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