Switches for GREC Unit 2 to Unit 1

Stock Group Operated Switches
Technical Specifications

1 Table of Switches
The below table includes all switches to be included in this purchase request.
Qty Voltage Amps BIL Mechanism Type Orientation Operator
(cont.)
4 161kV 3000A 750kV Vertical Break Horizontal Worm Gear

2 INDIVIDUAL DATA SHEETS
2.1 161kV Horizontal Mount Vertical Break
This sheet is to be filled out for each type of switch.
QUANTITY of SWITCHES for this DATA SHEET: 4
Substation Name: For Stock
VOLTAGE (L-L): 161 kV
BIL: 750 kV
AMPACITY (Continuous): 3000 A
AMPACITY (Momentary): STD
TYPE OF MECHNISM: Vertical Break
MOUNTING: Horizontal
PHASE SPACING: 9 Feet
SWITCH STAND: These switches are to replace four existing switches and mount
them on the existing steel. See Drawings GR1-F-1-0-06-11 &
GR1-F-1-0-06-12.
OPERATOR: Worm Gear (4)
Direction of Rotation: CCW
SPECIAL FEATURES: N/A
Switch Tag(s): 107, 108, 109, 110
Preferred Manufacturers: Royal Switchgear / Southern States

3 GENERAL REQUIREMENTS
3.1 PROPOSAL
A. The Vendor/Manufacturer shall provide a bid proposal for the listed switches
(Discussed in Sections 1 & 2) and shall comply with the following specifications.
The vendor/Manufacturer shall call out specifically and label as such, any
exceptions to these specifications in his proposal. Non-compliance with any
specification may result in bid disqualification
B. The Vendor/Manufacturer's bid shall be on a lump sum price basis for which he
agrees to furnish the disconnect switches covered in the specification. Without
limitations, it is to be understood that the prices bid are to be firm and not subject
to adjustment due to changes in the costs of material, labor, or any other factors
except for those specifically authorized in these specifications.
C. The proposal shall state the time in weeks after receipt of the purchase order, when
the approval drawings specified will be submitted to the Company.
D. The proposal shall state a firm shipping date.
E. Proposal shall state the emergency overload ratings for four (4), eight (8), and
twenty-four (24) hours without loss of switch service life including deterioration or
loss of operational reliability.
F. With the bid document, Bidder shall state the width and thickness of the silver
plating on the switch contacts (female) and on the switch arm contact (male).
G. The Bidder shall furnish any drawings, pictures, or other descriptive data needed
to explain fully the type of equipment proposed. These Drawings shall clearly
indicate the kind, size, arrangement, weight, shipping breakdown, operational
components, external connections, anchorages, and installation dimensions.
3.2 GENERAL
A. This specification covers the furnishing of the switches listed on the Data Sheet.
The switches shall be complete with insulators, operating arms and mechanism,
mounting brackets, hardware, and documentation.
B. Within this specification, "switch" refers to a disconnect switch, complete with
manual or motor-operated mechanisms, all necessary piping, interphase rods, and
all assembly fasteners, including shop and field erection bolts, nuts, and station
post insulators.

C. The disconnect switches and their appurtenances shall conform to this
specification and shall comply with IEEE C37.32, IEEE C37.34, and NEMA
standards for air switches and supports.
3.3 SPECIFICATIONS
3.3.1 Disconnect Switches
1. Disconnect switches shall be of the 3-pole group-operated type, for either
vertical or horizontal mounting, equipped with ANSI 70 light gray station
post insulators.
2. Mechanical strength of switch and insulators shall be coordinated with all
forces to which they may be subjected during normal use and shall meet the
latest applicable NEMA and USA Standards. The switches shall be designed
such that no appreciable interphase forces will be transmitted to the switch
support structure during switch operation. Switches shall either open or close
satisfactorily under a deposit of hard ice 3/4 inch in thickness. Switch-blades
shall be counter balanced to prevent them from falling closed from any open
position. All materials used shall be suitable for outdoor use, demonstrating
resilience to environmental factors including humidity, UV exposure, and
temperature fluctuations. Documentation confirming compliance with
environmental durability standards shall be provided
3. All electrical contacts shall be silver to silver to ensure high conductivity and
durability. The Vendor/Manufacturer shall provide documentation verifying
contact material quality and specifications, including width and thickness of
silver plating on both female switch contacts and the male switch arm
contact, as part of the bid submission. This information is essential to
confirm the quality and longevity of contact materials in field conditions.
4. Each switch shall be equipped with stub-type arcing horns to safely divert
arcs and minimize wear on the main switch contacts. Arcing horns must be
designed to handle the typical operational conditions without deterioration.
The Vendor/Manufacturer shall provide material specifications and design
documentation for arcing horns as part of the equipment proposal
5. Terminal pads of switches shall be suitable for use with aluminum
connections, and the drill pattern shall comply with NEMA pad dimensions.
The typical drill pattern should allow the use of four 12-inch diameter bolts
on 1 34 inch centers, and if different, shall be stated in the proposal.
Terminals will be furnished by others.
6. If the switch is to operate at a voltage of or greater than 199 kV line to
ground, 345 kV phase to phase, then adequate corona suppression shall be
engineered into the switch such that detectable corona is not present at

operating voltage. All designs must comply with IEEE and NEMA standards
for high-voltage equipment, including verification documentation of corona-
free performance at specified operating voltages.
7. If disconnect switches are specified for manual operation, they shall be
designed to permit easy retrofit installation of motor-operated mechanisms
without structural alterations.
8. All bearing components shall be sealed, maintenance-free, and corrosion-
resistant.
9. Design must ensure that the current path shall not pass through bearings,
springs, hardware or hinges.
3.3.2 Operating Mechanism
1. General Requirements for Operating Mechanism
a) Switches shall be furnished with an operating mechanism complete with
vertical operating pipes, interphase rods, couplings, guide bearings,
flexible braid grounding strap, and offsets as required for operation from
the switch stand to provide group operations of all three blades from one
operating mechanism.
b) An indicator showing the status of the open and closed positions of the
switch shall be provided at each operating mechanism for ease of
operation and quick status verification.
c) Each operating mechanism must also include padlocking provisions to
secure the switch in either position for safety and operational control.
2. Manually operated switches.
a) The switch handle or gearbox shall be designed for installation
approximately 2'-6" above the switch structure foundation to facilitate
operation from ground level by a single operator.
b) Handle or gearbox mechanisms must be constructed from corrosion-
resistant materials to ensure durability in outdoor environments, with
minimal maintenance required.
3. Motor operated switches.
a) Motors shall be designed for DC operation with a standard control
voltage of 125VDC, unless otherwise specified on the Data Sheet.
Operating time shall not exceed 10 seconds to ensure prompt response.
Motors and control components shall be housed in a weatherproof cabinet
with a cabinet heater controlled by a thermostat operating on 120 or 240

VAC for humidity control and reliable performance in extreme
temperatures.
b) Each motor-operated mechanism shall include an auxiliary switch with a
minimum of eight (8) individually adjustable contacts (four "a" and four
"b" contacts), allowing flexibility in control circuit configurations.
c) The motor operator mechanism shall be equipped with a manual handle
for emergency hand-cranking. Motor operation must be electrically
disconnected during manual operation to prevent unintended actuation. A
mechanism for secure attachment of the manual handle shall be provided.
d) Each motor operator mechanism shall allow for manual testing directly at
the cabinet, with automatic inhibition of remote control signals during
manual testing to ensure safe local operation.
e) All motor-operated mechanisms must comply with the latest revision of
ANSI C37.32 standards for power-operated mechanisms, ensuring
consistent quality and performance across installations.
f) The motor mechanism cabinet's centerline shall be positioned
approximately 2'-6" above the switch structure foundation to facilitate
easy access for maintenance and operation from ground level.
3.3.3 GROUNDING
1) The switch shall be supplied with an 18" long ground strap and the necessary
hardware to attach the strap to the operating pipe and the switch stand steel.
2) The grounding strap must have an ampacity equal to or greater than a 4/0 copper
conductor to ensure effective grounding.
3) All grounding components, including connectors and hardware, must be
corrosion-resistant to withstand outdoor conditions and ensure long-term
reliability.
4) Grounding compliance with IEEE 80 and applicable NEMA standards is required,
with documentation provided by the manufacturer to verify that the grounding
equipment meets or exceeds these standards.
3.3.4 EQUIPMENT NAMEPLATE
1. High Voltage Switch Nameplate
Each high voltage switch will include a nameplate affixed in an accessible
location, containing the following information:

A. Manufacturer
B. Rating in amperes
C. Voltage rating (in kV)
D. Instruction book number
E. Catalog number
F. Year manufactured
G. Serial number
H. Rated short-time current (in kA)
I. Rated insulation level (BIL, if applicable)
2. Motor Operator Nameplate
Each motor operator shall have a separate nameplate, also positioned for ground-
level visibility, identifying:
A. Manufacturer
B. Operating voltage
C. Control voltage (if different from operating voltage)
D. Instruction book number
E. Catalog number
F. Year manufactured
G. Serial number
3. Nameplate Accessibility Requirement
To facilitate auditing and compliance with FAC-008, all nameplates must be
clearly visible from ground level. Options include:
* Secondary Nameplate - If direct mounting prevents ground-level viewing,
an additional nameplate with identical information shall be mounted in a
visible location (e.g. on the operator or operating pipe).
* Accessible Mounting Position - Nameplates must be positioned to ensure
clear ground-level readability without ladders or additional equipment.
* Weather-Resistant Material - All nameplates must be constructed from
weather-resistant materials to ensure legibility and durability in outdoor
environments over the life of the equipment.

3.3.5 SWITCH TYPES
1. Vertical Break
The Vertical Break Switch opens and closes by rotating the blade in a vertical
plane. It is commonly used for high-reliability applications and locations where
phase spacing does not allow center or side break switches. Its compact design
and vertical orientation are ideal for limited space or high-density installations.
2. Slanted Jaw Vertical Break
The Slanted Jaw Vertical Break Switch operates similarly to the Vertical Break
but with a slanted jaw mechanism, which allows for more efficient arc extinction
and reduces wear on contact surfaces. The shorter base allows for additional
phase to ground clearance distance for jumpers bending downward (e.g. to a
circuit breaker bushing).

3. Center Break V
The Center Break V Switch features a V-shaped configuration that opens in the
center. It provides dual break points per phase, enhancing arc suppression and
contact durability. The narrow base allows for maximum clearance to ground for
jumpers.
4. Center Side Break
The Center Side Break Switch rotates along a side axis, opening from the center.
It is designed for robust outdoor applications, with high reliability in
environments with space constraints or specific orientation needs.
5. Double End Break
The Double End Break Switch, often referred to as the Helicopter Switch, opens
from both ends of the blade, providing two points of disconnection. This switch