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首页> 外文会议>Relay 47th Conference, Apr 19-21, 1999, Newport Beach, California >A Method to Achieve Arcless Interruptions in Mechanical Relays
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A Method to Achieve Arcless Interruptions in Mechanical Relays

机译：实现机械继电器无弧中断的一种方法

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摘要

In most mechanical relays, the current is interrupted using only separating contacts. As the contacts open, an arc is drawn, dissipating the interruption energy. By adding a ceramic PTC (CPTC) element in parallel with the contacts, 100% of the interruption energy can be converted to heat, eliminating the arc. The initial voltage across the contacts must be less than a pre-determined value in order to shunt all of the current to the CPTC. The cold resistance of the CPTC essentially determines the initial voltage across the contacts and the current at which the CPTC trips. Two types of ceramic PTC devices were tested, with cold resistances of 16 and 32 ohms. In the case of each device, at 300V_(dc) and 1.0A, all of the interruption energy was consumed by the CPTC. At 300V_(dc) and 1.5A, the 16 ohm CPTC successfully absorbed 100% of the interruption energy; however, the 32 ohm CPTC device had a slightly lower performance at 98%. Because of the elimination of arcing, use of the CPTC relays will result in reduced contact size and increased operation cycles. It will also provide an arcless interruption for application in hazardous conditions.
机译：在大多数机械继电器中，仅使用单独的触点会中断电流。当触点断开时，会产生电弧，从而消耗中断能量。通过与触点并联添加陶瓷PTC（CPTC）元件，可以将100％的中断能量转换为热量，从而消除电弧。触点两端的初始电压必须小于预定值，以将所有电流分流至CPTC。 CPTC的抗冷性实质上决定了接点两端的初始电压以及CPTC跳闸的电流。测试了两种类型的陶瓷PTC器件，其冷阻分别为16和32欧姆。对于每个设备，在300V_（dc）和1.0A的情况下，所有中断能量都由CPTC消耗。在300V_（dc）和1.5A时，16欧姆的CPTC成功吸收了100％的中断能量。但是，32欧姆CPTC器件的性能略低，为98％。由于消除了电弧，使用CPTC继电器将导致触点尺寸减小和操作周期增加。它还可在危险条件下提供无电弧中断。

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