POWER/VACPOWER/VACPOWER/VACPOWER/VAC

Metalclad SwitchgearMetalclad SwitchgearMetalclad SwitchgearMetalclad Switchgear

Application GuideApplication GuideApplication GuideApplication Guide

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USE OF APPLICATION GUIDE

This Application Guide provides information necessary

to help plan and specify medium-voltage power system switchgear, using General Electric’s POWER/VAC vacuum metalclad switchgear application procedure in an orderly, step-by-step manner. Since it is intended to be a workbook, only the data necessary to choose applicable switchgear is included.

Complete specifications can be written for most switchgear applications using this publication. Guidance is given in developing a system one-line diagram, calculating short circuit currents, and references to appropriate literature is presented. This technical information goes beyond the usual scope of an application guide. General Electric, under special contract agreements, will perform power system studies, including the necessary calculations and comparisons.

The topics discussed in the first five sections of this guide

are of a general nature, applicable to any type of medium-voltage metalclad switchgear. Information is provided relating to one-line diagrams, circuit breaker ratings and selection, control power requirements, basic circuit protections considerations, and specific recommendations for protection, instrumentation, and control for basic switchgear circuits.

The remainder of the application guide explains the application and specification of General Electric POWER/VAC metalclad switchgear. The concepts of modular construction and device package structuring are basic to POWER/VAC switchgear and are introduced and illustrated through application details covering the use of POWER/VAC switchgear and are introduced and illustrated through application details covering the use of POWER/VAC breakers in basic circuit applications. Auxiliary unit and power conductor compartment structuring are also included. Following the selection of individual units, an optimum lineup configuration can be developed using the guidelines given. Finally, a specification procedure, complete with Guide Form Specifications, is suggested to facilitate the documentation of POWER/VAC metalclad switchgear requirements. This approach to metalclad switchgear application is typical and its use is recommended. Where practical, begin with Section 2 and work through the guide in a step-by-step fashion. The guide’s structure is based on extensive engineering experience and will service as a checklist which will aid in preparing complete specifications.

Since the application of POWER/VAC metalclad switchgear is the underlying purpose of this guide, a brief introduction of POWER/VAC will serve as useful starting point to begin the application procedure.

POWER/VAC METALCLAD SWITCHGEAR POWER/VAC metalclad switchgear is designed for

applications on 5-kV, 8.25V, and 15-kV power systems with available short-circuit capacities from 250 through 1500 MVA nominal. A typical lineup of indoor POWER/VAC switchgear is shown in Figure 1-1.

POWER/VAC circuit breakers are rated per ANSI

C37.06-1979, Table 3.1.1. Available ratings are shown on page 3-3 of this application guide.

POWER/VAC switchgear is designed, built, and tested

to the applicable industry standards shown in Table 1-1. POWER/VAC equipment is furnished in five basic

types; indoor, outdoor weather proof (no aisle), protected-aisle outdoor, common-aisle outdoor (aisle shared by two facing lineups) and arc resistant. Figure 1-2 shows typical section outlines for each of the basic equipment types. Dimensions and weights are shown in Section 8.

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Figure 1-1. Typical lineup of indoor POWER/VAC switchgear.

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Compliance with other National Standards (Must be reviewed with marketing Burlington, IA) International Electrotechnical Commission Standards (IEC) Power/Vac vacuum circuit breakers Type VB and Type VB1 comply with IEC ratings listed in Table 3.1.3 Underwriters Laboratories, Inc. (UL) Power/Vac vacuum metalclad switchgear and associated circuit breakers are optionally available with UL labeling per UL standard 1670. The requirement for UL labeling must be made known as a requirement in the bidding stage and agreed to by

Switchgear Marketing, Burlington, Iowa. UL labeling under File No. E138019 category DLAI. CAUTION: Not all medium voltage switchgear assemblies qualify for UL listing. Canadian Standards Association (CSA) Power/Vac metalclad switchgear and associated circuit breakers are optionally available with CSA markings and are

in compliance with CSA C22.2 NO. 31. Requirements for CSA marking must be made known as a requirement in the bidding stage and agreed to by

Switchgear Marketing, Burlington, Iowa. CSA File NO. LL-95616-2.

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Standard No.

Description Standard No.

Description

C37.04 AC Power Circuit Breaker Rating Structure

SG-2

High-voltage Fuses

C37.06 Preferred Ratings of Power Circuit Breakers

C37.09 Test Procedure for Power Circuit Breakers

SG-4 Power Circuit Breakers

C37.010 Application Guide for Power Circuit Breakers

C37.11 Power Circuit Breaker Control Requirements

SG-5 Power Switchgear Assemblies

C37.20 Switchgear Assemblies and Metal-Enclosed Bus

C37.100 Definitions for Power Switchgear

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Figure 1-2. Typical section outlines

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General Electric’s POWER/VAC metalclad switchgear combines the advantage of metalclad construction−flexibility and economy−with the benefits of vacuum interrupters−reliability, low maintenance, and reduced breaker size and weight.

Specifically, POWER/VAC switchgear incorporates the following new basic design elements, compared to air-magnetic and early designs of vacuum metalclad switchgear.

• POWER/VAC offers two-tier breaker stacking for application flexibility and floorspace savings.

• POWER/VAC utilizes modular construction resulting in one basic vertical section size, thus simplifying system planning and providing installation savings.

• POWER/VAC features structured protection, instrumentation, and control (PIC) packages for most switchgear applications, minimizing planning and engineering time.

These fundamental design improvements affect

certain elements in the switchgear application procedure, principally the one-line diagram and the arrangement of

switchgear units in a lineup. Since these application considerations are a result of the equipment design, a brief illustration of POWER/VAC switchgear design concepts is provided.

TWO-TIER BREAKER STACKING

Mixing and matching of a variety of 94” deep unit types and breaker ratings is possible using two-tier unit stacking. The twelve standard combinations of upper and lower units are shown in Figure 1-4. Indoor 82” deep is an option, see Figure 1-6 and 106” deep optional stacks are available. If 2-high switchgear is required at an 82” depth, generally the cables in the A compartment must exit the top of the stack and the cables in the B compartment must exit out the bottom of the stack. In addition, several other restrictions apply and Burlington marketing should be consulted.

MODULAR CONSTRUCTION

Breakers and auxiliary devices can be accommodated in the upper and lower breaker compartments as shown in Figure 1-3. Typical equipment section views in Figure 1-3 illustrate how upper and lower units can be combined.

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Figure 1-3. Typical upper and lower unit configurations.

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Note: (1) Blank Unit (above 3000A, 3500A & 4000A breakers)—device mounting space in door. (2) Auxiliary Unit: Adjacent to tie breaker for tie bus auxiliary. Can house 1 bus connected roll-out tray. (3) Auxiliry Unit: Used for line or bus connected roll-out trays when located above or below a circuit breaker. (4) Can house 2 rollouts in A and/or B compartment. See figure 1-5

Figure 1-4. Twelve standard combinations of upper and lower units ((

1200A Breaker

2000A Breaker

Unit Blank

3000-3500A Breaker

1200-2000A Breaker

Blank Unit

Auxiliary Unit

Auxiliary Unit

4000A* (Fan Cooled)

Breaker

1200-2000A Breaker

Auxiliary Unit

Auxiliary Unit

Auxiliary Unit

Bus Entrance

1200-3000A

1200-2000A Breaker

1200A Breaker

1200A Breaker

Breaker or Bus Entrance

Tie Bus 1200-3000A

Bus Entrance 1200-3000A

1200-3000A Tie Breaker

Bus Entrance 1200-3000A

Bus Entrance 1200-3000A

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Devices Ratings Roll-out Unit A Compartment B Compartment Lower Upper Lower Upper

3-VT’s (1) 2-VT’s (1) 1-CPT (1) 1-CPT (2)

CPT Fuses (3)

5kV and 15kV 5kV and 15kV 5/10/15 kVA

25kVA and 37.5kVA --

-- -- -- --

Fused Unit

Yes Yes No No No

Yes Yes Yes No No

Yes Yes Yes No Yes

Yes Yes No No No

Figure 1-5 Auxiliary Devices

(1) Fuses are an integral part of the device. (2) CPT has to be installed in cable compartment. CPT fuses are installed in a key interlocked fused roll-out in Lower B or

middle A drawer.((3) Must have a key interlock for CPT secondary breaker.(

Notes: • In “A” Compartment: Upper and lower roll-out can be either bus or line connected as long as both roll-outs in a same

compartment are connected in the same manner. • In “B” Compartment: Only one roll-out can be installed in an auxiliary tie bus compartment.

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Figure 1-6 Breaker with PT Line Side Connected

Figure 1-7 Breaker with PT Load Side Connected

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PIC PACKAGES

Available PIC packages (Protection, Instrumentation,

and Control) complement POWER/VAC structured equipment and breaker designs. A PIC package for application on a general-purpose feeder is shown in Figure 1-7. Structured PIC packages contain all door-mounted devices such as relays, switches, meters, and instruments, and all non-door-mounted devices such as fuses, current transformers, and voltage transformers that are required for proper circuit operation in a wide variety of basic switchgear applications. Because PIC packages are pre-engineered, the specific devices included in the materials list are provided. See Section 6 for frequently applied packages.

SUMMARY

In summary, POWER/VAC switchgear differs in design

and construction from traditional single breaker, air-magnetic, and vacuum switchgear designs. From an electrical standpoint, however, the application procedures and guidelines for POWER/VAC are identical to those for other types of metalclad switchgear. This guide provides direction for proper application of POWER/VAC switchgear.

*STD. (82” Optional. See Below)

CABLE COMPARTMENT • Designed for up to 2-750 MCM/ ∅ per breaker; cables above or below. • CT’s with greater than ANSI accuracy must be mounted in cable

compartment and may limit such cases to one breaker per vertical section.

• Stress cone space of 21 inches is provided and use of preformed stress cones, such as GE Termimatic ™, is recommended.

∗ Certain simple cable compartment configurations such as clamp type terminations for one moderate-sized cable per phase, with or without Ground Sensor, permit a unit depth of 82 inches on indoor units.

*STD. (82” Optional. See Note Under “Cable Compt.”)

BUS COMPARTMENT • 1200A and 2000A: Copper standard. • 3000A bus and 3500A bus is copper only. • Bus supports designed for 80,000A momentary. • All joints connected with 2 bolts and booted. • Bus support insulation system: Non-tracking polyester glass (std. 5kV & 15kV)

Porcelain inserts (optional) Fluidized bed epoxy bus insulation.

Figure 1-9. PIC package application on a general purpose feeder.

Typical Equipment Section Views

Typical 2 Bkr. Feeder Unit Clamp Type Term. For Cable Above Typical Incoming Line Unit With Main Breaker & CPT & VT Roll-outs in Same Unit

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Figure 1-8. Possible combinations of upper and lower units