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Differentiation Of The Meaning Of Several Electrical Parameters In Female IC Socket
Jun 30, 2017

Differentiation of the Meaning of Several Electrical Parameters in Female IC Socket
 In recent years, with the deepening of the socialist market economy, product competition is also increasingly fierce. Some Female IC Socket manufacturers in order to promote the promotion of products, in its sample or product manual on the arbitrary provisions of some of the scientific and standard does not meet the technical requirements of the technical parameters, causing confusion. The second is the meaning of the parameters clear, but in order to allow users to feel that their products than other home superior, intends to blur the concept of high level, whether that is the case, are the same Is not serious and irresponsible. In order to clarify the problem, we will, according to national and international standards to express the meaning of electrical parameters, so that the original source. Rated working voltage "electrical terminology Female IC Socket" (GB / T2900.18-92) on the "rated operating voltage" is defined as: "under the specified conditions, to ensure that the Female IC Socket normal working voltage value." China and the world More than 30 countries rated working voltage is 50Hz 220 / 380V, Britain, Australia, more than 10 countries are AC 50Hz 240 / 415V, Bangladesh, India, Malaysia, Pakistan, Singapore, and other countries are exchange 50Hz 230 / 400V. There are 127 / 220V and so on. IEC publication 38, in view of the voltage range is too much, affecting trade and communication, it is recommended that countries in the future unified use of 230 / 400V standard voltage (molecular phase voltage, denominator for the line voltage), but this reform involves a great, The vast engineering system, so the world still use the original voltage system.

         China since it is 220 / 380V can not appear 400V operating voltage. But there are many manufacturers of short circuit samples, its short-circuit breaking capacity column impressively marked the rated voltage of 400V, in the case of short-circuit breaking current, let the user think it is higher than the 380V (if only from the numbers, 400V Much higher than the 380V natural). The behavior of such a high working voltage is a misunderstanding if it is not intended to be confused. Circuit breaker in the short circuit breaking test and overload operation performance test, are provided, the test voltage of 1.05Ue, it was understood as 1.05X380 = 400V. In fact, here 1.05 times Ue is the power frequency recovery voltage (steady state recovery voltage). GB / T14048.1 on the provisions of the test parameters, the voltage Ue tolerance is +5%, that is, the grid voltage fluctuations can be 0 to 5% range, that is, 380 ~ 400V, and power frequency recovery voltage is 1.05 times Ue, Ue Including this fluctuation range (maximum upper limit). Another misconception is that the general transformer to the user is a low voltage ratio of 10 / 0.4KV, that is, the primary voltage of the transformer is 10KV and the secondary (to the user) is 0.4KV, ie 400V, so the rated voltage of the circuit breaker The voltage is set at 400V. This is false. The secondary side of the 400V is the transformer's no-load voltage. When calculating the load voltage, consider the voltage drop inside the secondary winding, about 5% of the voltage. So the actual load voltage of 0.4 is 380V. For transformer (or generator), the rated voltage can be expressed by no-load voltage, and the rated voltage of the Female IC Socket device (including the switch Female IC Socket), the correct understanding and the actual performance assessment can only be the load Voltage. GB156-93 "standard voltage" in the three-phase four-wire system or AC system standard voltage and electrical reserve rated voltage requirements: 220V, 380V, 660V ....... The standard rated voltage for generators is also specified: 230V, 400V, 690V .... Standard also provides: "with the generator outlet supporting electrical equipment, the rated voltage can be used generator rated voltage, specified in the product standards." And our circuit breaker at present does not seem to be with the generator (or transformer) Outlet matching.

         To sum up, the so-called product rated voltage is 400V or 690V are not correct formulation. On the rated insulation voltage GB / T1900.18 on the rated insulation voltage is defined as: "under the specified conditions, used to measure the Female IC Socket and its parts of the different parts of the insulation strength, electrical clearance and creepage distance standard voltage . Unless otherwise specified, the ratio is the maximum rated operating voltage of the Female IC Socket. "Equivalent to IEC947-1 (1st edition, 1998) GB / T14048.1" Low Voltage Switchgear and Control Equipment General "emphasizes system insulation , So the Female IC Socket for the power system conditions: Female IC Socket rated insulation voltage should be higher than or equal to the rated voltage of the power supply system. (Slightly) from the standard requirements of a Female IC Socket products if there are a variety of operating voltage values, such as 380V (the vast majority of the product voltage level) and 660V (commonly used in mines), the rated insulation voltage can be Set to 660V. After the rated insulation voltage is calibrated, the CTI value (compared to the leaked Female IC Socket index) of the contamination level (the CTI value is the same as the grade of the insulation material) , Divided into I, II, IIIa, IIIb four), to determine the minimum creepage distance of the product. For example, the rated creepage distance of the Female IC Socket with rated insulation voltage of 660V, pollution level 3, material group IIIa, IIIb, and long term voltage is 10mm. The Female IC Socket product can use this value to design the creepage distance of each of its insulators without any need to increase its rated insulation voltage.