Connection Equipment

According to the principle of the spark gaps are divided into unmanaged and managed. Contact information is here: Daniel E Straus. In unmanaged dischargers breakdown occurs at a certain voltage values, depending on the design of the device. In managed – in a certain range of voltages at a pulsed voltage on the gate electrode. The advantages of spark gaps: no heat, virtually instantaneous willingness to work High reliability, small size and weight, Simple design and technology production. Disadvantages spark gaps: For tripping devices to the high value of the transmitted voltage (kV), which results in damage to the equipment being protected.

The intensity of the spark occurring in the while conducting state, often causes interference and leads to a malfunction of nearby electrical equipment. Residual currents lead to disruptions in power and, therefore, unpredictable in the equipment. Parallel Connection of varistors. Varistor Eng. varistor, from vari (able) – ac and (resi) stor – resistor, a semiconductor resistor, the electrical resistance (conductivity), which does not vary linearly and equally under the influence, both positive and negative voltage. For the manufacture of varistors used powdered silicon carbide (semiconductor) and a binder (clay, water glass, paints, resins, etc.) are pressed into shape and sintered it at a temperature of about 1700 C.

Then the sample surface metallized and soldered to its findings. Low-voltage varistors are made on the operating voltage of 3 to 200 V and current of 0,1 mA to 1 A; High-on voltage to 20 kV. Advantages: Varistors have a negative temperature coefficient of resistance, able to withstand considerable electrical overload Easy and cheap, have high reliability, low inertia (limiting the operating frequency to 500 ).

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