IEEE Std 1215:2001 pdf free download

IEEE Std 1215:2001 pdf free download.IEEE Guide for the Application of Separable Insulated Connectors.
3.6 Tools
3.6.1 live-line tool: An insulating tool, typically made of liberglass. that is designed for use on. or in the vicinity of. high-voltage equipment. As used in the context of this standard, the live-line tool additionally provides a means of mechanically attaching to and locking onto the pulling eye of a separable connector and provides a means of transferring mechanical force between two or more points. Common names for live-line tools used to operate separable connectors include shotgun stick. switching stick, clamp stick, shotgun tool, etc.
3.6.2 probc wrench: A tool designed for use in installing the probe into the compression lug of an elbow. Some types include a mechanism for limiting the maximum torque applied during installation of the probe.
4. Design considerations
4.1 Systems
4.1.1 Underground distribution systems
Numerous types of distribution systems exist. In North America. the most common type of distribution system is the three-phase. four-wire multigrounded-neutral syStem. This system consists of three-phase conductors and a neutral conductor. The neutral conductor is grounded to earth at numerous locations. In most cases, the source supplying three-phase. four-wire distribution circuits is a wye-connected transformer with the neutral solidly connected to earth. Where the source is a delta- connected transformer, a grounding or zigzag transformer of sufficiently low impedance to limit the phase-to-ground voltages is also installed. To provide single-phase service. transformers are connected between one phase conductor and neutral.
Another distribution system is the three-phase. three-wire ungrounded system. This system consists of only three phase conductors. The source supplying these systems is either delta- or wye-connected transformers. To provide single-phase service. transformers arc connected between two of the phases.
Continuous operating voltage across the separable connector is not to exceed the rated line-to-ground voltage.
4.1.2 Single-phase versus three-phase rating
Unlike cable voltage ratings, separable connector voltage ratings are based on the maximum line-to- ground voltage of the circuit and the maximum line-to-line voltage. Consequently, separable connectors are marked with either a single or a dual rating. For example. a separable connector with a single rating of 8.3 kV is suitable for use on single-phase circuits where the maximum phase-to-ground voltage is 8.3 kV or less. The single rating is the maximum voltage allowed across the connector insulation from the conductor to the insulation shield. Since the insulation shield is grounded, this is the maximum phase-to-ground voltage. Both deadhreak and loadhreak connectors can he single rated. For loadhreak connectors that are single rated, the normal recovery voltage across the contacts during a loadhreak operation cannot exceed the single rating (8.3 kV in the example). Consequently. loadbreak separable connectors with a single rating can be applied on single-phase circuits where the transformers arc connected line-to-ground.