IEEE 1234-2007 pdf free
IEEE 1234-2007 pdf free.IEEE Guide for Fault-Locating Techniques on Shielded Power Cable Systems.
This guide has been developed as a guide for cable fault-locating techniques on shielded power cable systems. It is intended to emphasize those fault-locating techniques that maintain cable integrity, reduce customer outage time, and consider customer equipment sensitivity and safety. This guide applies to all insulated, shielded power cable systems.
1.2 Scope
The introduction of cables with extruded dielectric insulation and of modem splicing technology has imposed new conditions and restrictions on cable fault locating. The use of excessive high voltages and energies during ac, dc. and surge testing of sen ice-aged power cable systems with extruded dielectric insulation may overstress insulation, creating defects that become faults after the cables are returned to service.
This guide is intended to be applied to medium-voltage distribution cables. Medium-voltage distribution systems generally operate at system voltages above I kV and up to 34.5 kV nominal.
The end user of the cable circuit should evaluate the necessity for verifying the integrity of extruded dielectric insulated cables, and, if they are in critical service, proceed to perform the high-voltageenergies testing. If not detected during dielectric tests, defects in dielectric materials may result in cable failures during the transient voltage surge episodes while in service.
1.3 Purpose
This guide is intended to provide trouble-shooting and testing personnel with information to quickly identify a faulted cable section andor locate a cable fault with minimum risk of further damaging serviceable cables, terminations, and equipment.
2. Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
3.1 Definitions
For the purposes of this guide, the following terms and definitions apply. The Authoritative Dictionary qf IEEE Standards, Seventh Edition [B9]4, should be referenced for terms not defined in this clause.
3.1.1 aerial installation type: An assembly of insulated conductors installed on a pole or similar overhead structure; it may be self-supporting or installed on a supporting messenger cable.
3.1.2 bolted fault: A cable fault having a resistance value of less than 5.
3.1.3 branch circuits: A cable system in which independent cables branch out radially from a common source of supply. (See also: radial feed)
3.1.4 breakdown: A disruptive discharge through insulation.
3.1.5 cable tray installation type: A structure of ladders, troughs, channels, solid bottom, and other similar devices through which cables systems may be routed.
3.1.6 characteristic impedance: The driving impedance of the forward-traveling transverse electromagnetic wave. In cable fault locating, an incident wave on a cable (time domain rcfiectomctcr ITDRJ, thumper. etc.) is reflected back to the source positively, negatively, or not at all by discontinuities and inhomogenities in the cable where impedance values differ from the characteristic cable impedance. respectively.IEEE 1234 pdf free download.
