IEEE Std C62.34 pdf free download

IEEE Std C62.34 pdf free download.Test Methods and Performance of Low-Voltage (1000 V rms or Less) Surge Protective Devices Used on Secondary Distribution Systems (Between the Transformer Low-Voltage Terminals and the Line Side of the Service Equipment).
Appropriate precautions shall he taken to keep these factors within manageable limits. Precautions may include suitable extinguishing agents in sufficient quantity, physical separation from other combustibles, or other appropriate measures. In evaluating the possibility of explosion, consideration should be given to component failure whenever hazardous materials are available in sufficient quantity to create an explosive atmosphere.
All surge testing shall be conducted by technically qualified personnel who arc aware of the hazards of such testing. The voltage and current levels generally associated with surge testing are well above those considered lethal. Some considerations are the possibility of an accidental discharge of the surge generator, the consequences of a flashover to an unfavorable circuit, the possibility of a charge being trapped in the SPD, or the consequence of a violent component tilure. Testing personnel should never stand in the line of sight of components on printed circuit boards or panels with the enclosure open during SPD surge testing. On occasion, a component can unexpectedly fail in an explosive manner during surge testing. Fragments of the ruptured case and the component might cause injury to personnel in the vicinity. If visual observation is desired, a suitable transparent harrier shall be provided.
Surge testing of SPDs is best conducted only in an area dedicated solely to that purpose. The boundaries of’ the area should be clearly defined and appropriately marked. The surge test area should be kept free of all materials, meters, and test setups that arc not associated with the surge test being conducted. Where possible, the area should he isolated and equipped with electrical or mechanical interlocks, or both, on all entrances into the test area and on removable barrier panels. All metal fences and barriers should be bonded to the grounding system. Consideration should he given to the possibility of the surge flashing over to circuits or metallic parts that were not intended to be surged.
When the SPD can he enclosed in an effective harrier, the preceding requirements for installation are easier to satisfy. This barrier may simply be sufficient separation—including separation from the floor, which should be presumed to contain conduit or other metal. Alternatively, the entire harrier may be made up of physical insulation. In either case, it should be complete, except where it is penetrated for insertion of input or output lines and measurements probes; and it must be able to provide adequate protection for a peak voltage equal to at least twice the peak of the incident test surge. (Circuits in breakdown mode at or near the surge peak can oscillate at high frequencies. Such oscillatory flashovers can thereby increase effective applied peaks by a factor approaching two.) Interlocks should be provided to reduce risks associated with access between tests.
Capacitors in the test circuit or the device under test can retain a trapped charge. Suitable bleeders or shortcircuiting devices should be provided to protect the operator against any such trapped charge after passage of the test surge.
EMI from surge testing could conceivably cause malfunction of robots and other automatic equipment. Such equipment should be removed from the immediate vicinity of surge testing operations.IEEE Std C62.34 pdf download.