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Scope
Design Concepts
Design Concepts
Design Criteria
Design Criteria II
100
the chapter that establishes the design criteria to be used in designing feeder systems.
What is DDS Chapter 2
100
applies to the planning of new distribution circuits, the undergrounding of an existing section of an overhead feeder, or the installation of a new section of a feeder. These criteria also apply to the rearrangement of an existing feeder section.
What is the feeder system design criteria (Ch 2- 3.0)
100
Due to equipment bushing limitations, certain transformer sizes and protective equipment require installation of 1/0 AWG JCN. The affected equipment includes the following:
What are Equipment associated with a loadblock, at 12 kV, both 1,500 kVA and 2,500 kVA transformers, and at 16 kV, both 2,500 kVA and 3,750 kVA transformers (DDS 2-5.1)
100
This will be sized in accordance with Table 9–1.
What is an underground cable (DDS Ch 2 - 5.0)
100
shall be installed ahead of an underground dip when a ferroresonant condition exists between the riser pole and a switch in the underground system.
What is an overhead pole switch (5.3.B)?
200
a section of cable that originates from a switched position on the System Feeder and extends to another switch with no intent to create a paralleling point.
What is the Dead End Feeder.
200
being deferred when the actual need for equipment is not required for five years; and conduits/substructures are not required for ten years.
What is capital expenditures (installations of plant).
200
Should be planned for peak load conditions
What is a feeder design
200
This will be sized in accordance with Table 9–2 and Table 9–3.
What is overhead conductor (5.1)?
200
is the preferred standard for new switch installations where switching can be performed from the overhead system. The Omni-Rupter® switch may be used on riser poles to switch underground systems.
What is omni and alduti rupter switch (5.3.C)?
300
Uses 600 A components and switches, and contains paralleling points to other circuits and/or itself. It is recommended to consider installing circuit tie switches approximately every 1/3 of the system feeder for reliability purposes.
What is System Feeder (Ch 2 - 1.1)
300
further expansion of these systems should be avoided. If load needs to be added, to these existing circuits, Field Engineering needs to be consulted.
What is the 4 kV system
300
ot allowed to be connected to the System Feeder between the substation and the first switch position.
What is a T-Tap
300
The critical portion of most circuits is this as it leaves the substation carrying the entire circuit load in a duct bank common to other loaded cables.
What is the getaway cable (5.1)?
300
replaced the Pad-Mounted Housing (PMH), live-front switchgear as the recommended standard for new underground fed installations.
What is a PME switch (5.3.2)?
400
designed with cables ranging in size from 350 to 1,000 kcmil for 12 kV to 16 kV, and 4/0 to 1,500 kcmil for 33 kV.
What is the Underground System Feeder (Ch. 2, 1.1)
400
a single subsystem or a grouping of subsystems, and can be any combination of C/I and/or residential load up to 1,500 kVA.
What is load block.
400
This should be avoid when installing a new switch to allow for future expansion.
What is a T Tap?
400
These switches are the standard when designing a new feeder system.
What is padmounted?
400
must be fused with current-limiting fuses, unless the installation requires fusing of more than 100 A (two 50 A fuses).
What is A PME switch (5.3.2.)
500
designed with 336 to 653 Aluminum Conductor Steel Reinforced (ACSR). In some cases, it may be appropriate to use 1/0 CLP and 1/0 ACSR for the System Feeder in accordance with planned future system requirements.
What is the Overhead System Feeder.
500
These are primarily used as source lines to small substations. They are used more often as a subtransmission system than a distribution system. Occasionally, it is necessary to connect a single-phase or three-phase transformer to these in order to feed a single or three-phase load.
What is the 33 kV system
500
are not allowed on Future System Feeders or Dead-End Feeders due to loadblock definitions (for example, de-energizing a loadblock may not affect any other loadblock).
What is A T Tap (DDS Ch 2--3.3)?
500
These switches in vaults are no longer approved except in the following situations:  Installations where it is not technically feasible to install pad-mounted equipment. Refer to DDS-6, Section 1.1, for definition of technically feasible;  Installations in the public property and public rights-of-way where the local governments create insurmountable obstacles for pad-mounted equipment; or,  When replacing existing failed subsurface switches in vaults.
What is subsurface switches (5.2)?
500
allows remote grounding and reduces the time devoted for grounding activities required when work is being performed in the field.
What is RAG (5.3.4)?