Picture show Explanation Arrester arrester disconnector is an annex to the arrester used in tandem. Its purpose is abnormal when the arrester fails, use the arrester frequency flowing through the short-circuit current let disconnector action, so that the ground terminal from the device automatically disengage arrester system is running out to prevent further incidents, and gives arrester failure to visibility from the logo, ease of maintenance personnel to detect trouble spots for maintenance and replacement. When the arrester is in normal working hours, from AC conduction state renders the system without affecting the original work status and lightning protection features, to ensure the normal operation of the system, so that the arrester truly achieve a "maintenance-free" use requirements. Because of the excellent properties of the disconnector in foreign countries, such as Europe, America, Japan and Southeast Asian countries and regions, various types of grid operation arrester has been supporting the use of a more general disconnector. Along with the rapid development of power construction and safety requirements of the power system, the country has in the power generation, power plants, railways, civil aviation, telecommunications, mining and other important supply places, has also been gradually promote the use of the disconnector.
Out of control by using the principles and performance is divided into hot-melt type disconnector and thermal blast from the device, hot melt type disconnector flowing through the arrester failure frequency short-circuit current, so that the alloy disconnector fuse blown to meet graduation purposes. Hot blast from the device is the use of flow through the arrester failure frequency short-circuit current in the arc is generated from the device detonated explosive components to achieve the heat off purposes.
Company disconnector production standards enforced GB11032-200 "metal oxide surge arresters without gaps for AC" and IEC.C62 "distribution arrester disconnector requirements." The use of environmental requirements from the arrester and the same. Product Features 1, hot blast Disconnector
In China power grid, 35kV and below the power system are mostly neutral non-effectively grounded system, which is foreign direct effectively grounded neutral point grid systems, mostly small fault current arrester current, given the characteristics and learn from foreign companies (such as U.S. company GE, Sweden ABB, Siemens and other famous companies) hot blast from the advantages, developed a RBT-3, RBT-4-efficiency of new disconnector, which has the following characteristics:
A, operating current range: combining the characteristics of China's power grid itself, either in a large frequency fault current (> 50A) under the detachment, can also be in a small frequency fault current (50mA) under the detachment.
B, from the fast: with circuit breaker reclosing feature match, not only for various voltage levels into the various types of surge arresters, also applies to a different grounding system (neutral effectively grounded system and neutral non-effectively grounded system).
C, impact resistance current capability Strong: GB GB11032-2000 requirements 2ms square wave impulse withstand current and high current impulse withstand 4/10μs not operate under both.
D, high mechanical strength, good sealing performance: from the device without the action before blasting off high mechanical strength, good sealing performance. RBT-3-type tensile strength> 2000N, RBT-4 type Tensile strength> 4000N, RBT-3 type from the device can be used with the following arrester 35kV supporting the use, RBT-4 type disconnector with 35 ~ 220kV arrester necessary use.
E, easy installation and replacement: from the uses threaded external interface is extremely convenient and reliable tandem with arrester, disconnector a replacement but the action is very convenient, saving time and effort.
2, hot melt type disconnector
Hot melt type disconnector failure arrester flowing through the power frequency short-circuit current, so that the low-temperature alloy disconnector fuse fuse (fuse open) to achieve from the goal, so hot-melt type disconnector from the time the hot blast from the device long, 50mA ~ 5A off time is 0.8 ~ 1.9min. But hot-melt type disconnector is disengaged, neither voice of an explosion, and no explosion shock and explosion debris, the installation does not have any impact on the environment.
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Operating current（A）
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0.05
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0.5
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2
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20
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200
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800
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Action time（s）
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300~400
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50~70
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4~6
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0.4~0.5
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0.03~0.04
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0.008~0.015
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Chinese
