E11.REV

UNIT SUBSTATION

NOTE: FINAL COPY: JUNE, 1988.

Part 1 -	GENERAL

1)	WORK INCLUDED

A.	Work in this Section includes the providing of labor, materials, equipment and services necessary for a complete and safe installation in accordance with the contract documents and all applicable codes and authorities having jurisdiction for unit substation with the following characteristics.

1.	Double-ended.

2.	Single-ended.

3.	Capacity: ----- KVA.

4.	Voltage: Primary -----V; secondary ----- V, 3-phase, ----- wire, 60 hz.

5.	Incoming line sections: 2 - ----- KV air interrupter switches.

6.	Incoming line section: 1 - ----- KV air interrupter switch.

7.	Transformers: 2 - ----- kva.

8.	Transformer: 1 - ----- kva.

9.	Low voltage switchboard: -----v., 3-phase, ----- wire, 60 hz.

10.	Indoor type.

11.	Outdoor type.

2)	RELATED WORK AND REQUIREMENTS

A.	Requirements of GENERAL CONDITIONS, DIVISION No. 1 and Section GENERAL PROVISIONS FOR ELECTRICAL WORK apply to all work in this Section.

NOTE: EDIT TO SUIT PROJECT REQUIREMENTS. INCLUDE ONLY SECTIONS DIRECTLY AFFECTING WORK OF THIS SECTION

B.	Related work in the following Sections:

1.	CABLE TRAY (CENTER SPINE TYPE).

2.	CABLE TRAY (SIDE RAIL TYPE).

3.	WIRE AND CABLE.

4.	BUSWAYS.

5.	LOW VOLTAGE DISTRIBUTION SYSTEM.

6.	MEDIUM VOLTAGE SWITCHGEAR.

7.	MOTOR CONTROL CENTERS.

8.	MOTOR CONTROLLERS.

9.	ELECTRIC SERVICE SYSTEM.

10.	POWER, CONTROL AND ALARM WIRING SYSTEMS.

11.	GROUNDING DEVICES.

12.	DEVICES.

13.	LIGHTING FIXTURES.

14.	PIPE TRACING SYSTEM.

15.	-----.

3)	REFERENCE STANDARDS

A.	Published Specifications' standards, tests or recommended methods of trade, industry or governmental organizations apply to work in this Section.

B.	Comply with all applicable national, state and local codes and refer to Section GENERAL PROVISIONS FOR ELECTRICAL WORK for additional Reference Standards.

4)	QUALITY ASSURANCE

A.	The installation shall be in accordance with NEMA, ANSI and IEEE standards.

B.	Refer to Section GENERAL PROVISIONS FOR ELECTRICAL WORK for Guarantee and other Quality Assurance requirements.

5)	SUBMITTALS

A.	Submit shop drawings for high voltage switchgear including the following:

1.	Plan and elevation drawings.

2.	Bill of material.

3.	Wiring diagram.

4.	Detail layout of equipment in switchgear module.

5.	Electrical characteristics of components.

6.	Time current characteristic curves.

B.	Submit shop drawings for transformer including the following:

1.	Dimensioned plan, elevation and section of the transformer, and of the transformer base.

NOTE: INCLUDE FOR LIQUID FILLED TYPE.

2.	Gallons of oil.

3.	Weights of core and coil structure, tank and accessories and oil, and total weight of transformer.

4.	Weight of transformer.

5.	Illustrative description of transformer, fittings and accessories.

6.	Performance data.

a.	Percent regulation at 80 percent and at 100 percent power factor.

b.	Guaranteed no-load at rated voltage and frequency.

c.	Guaranteed total losses.

d.	Guaranteed efficiencies at 1/4, 1/2, 3/4 and full load.

e.	Guaranteed exciting current at rated voltage and frequency.

f.	Design impedance.

C.	Test reports: Submit certified reports on each transformer of all regular tests made in accordance with the latest revision of the American Standard Test Code for Transformers, including resistance measurements, ratio polarity and phase relation tests, loss and impedance measurements, temperature test, applied potential test and induced potential tests.

D.	Low Voltage Switchboard: Submit the following:

1.	Plan; Top and bottom.

2.	Elevations: Front, rear and side.

NOTE: INCLUDE FOR ELECTRICALLY OPERATED BREAKERS AND AUTOMATIC TRANSFER SCHEMES

3.	Wiring diagrams including one-line wiring diagram and schematic wiring diagram including circuit breaker control and automatic transfer scheme.

4.	Time current characteristic curves of overcurrent protective devices.

Part 2 -	PRODUCTS

1)	BASE BID MANUFACTURERS

A.	General Electric.

B.	Westinghouse.

C.	Square D.

D.	Sorgel (cast coil transformer, primary and secondary casting).

E.	Sylvania (cast coil transformer, primary casting).

2)	MEDIUM VOLTAGE SWITCHGEAR

A.	Provide freestanding enclosure with self-supporting integral cubicles as manufaturered by the same manufacturer as switching equipment constructed of No. 11 gauge cold-rolled sheet steel.

1.	The enclosure shall be of welded and bolted construction.

2.	The enclosure shall be of angle iron construction.

3.	Provide access with:

a.	Front completely accessible.

b.	Front and rear accessible.

(1)	Provide hinge rear doors.

4.	Make provisions for future expansion.

5.	Provide cable entry with:

a.	Bottom entry.

b.	Top entry.

c.	Side entry.

d.	Rear entry.

6.	Doors: Provide full length bulkhead or reinforced type construction with minimum 3 latches.

a.	Inspection windows shall permit open and closed position inspection.

b.	Doors shall be interlocked to prevent access to energized switch or fuses.

c.	Doors shall be externally mounted and non-removable operating handles with provisions for padlocking in either open or closed position.

d.	Provide high voltage warnings. "Danger High Voltage" signs on each door.

7.	For outdoor, provide weatherproof construction and gasketed joints between cubicles or roof caps.

a.	Electric space heaters in each bay shall be wired to terminal block. Provide power wiring and thermostat as required.

b.	Louver shall be provided at top and bottom of front and rear of each bay. Louver shall be rain-proof and corrosion-resistant. Louver shall have inside baffles to protect against insertion of foreign objects.

c.	Provide rodent and insect screens.

NOTE: IN DUSTY LOCATIONS.

d.	Provide glass-fiber filters.

e.	Provide dripproof and vandalproof construction.

8.	Indoors: Louver shall be provided at top and bottom of front and rear of each bay. Provide insect and rodent screens.

9.	Finish: Apply zinc coating on both interior and exterior surfaces. Apply intermediate epoxy primer. Final coat of epoxy-resin shall be modified alkalide. All paint shall be baked on.

10.	Furnish lifting eyes for each section.

11.	Allow adequate space for terminations and cable training.

B.	Bus:

NOTE: (600, 1200 OR 2000 AMPS).

1.	Rating shall be ----- amp continuous.

a.	Bus shall be copper.

b.	Bus shall be aluminum.

(1)	Use Bellville washers.

c.	Provide ----- amp symmetrical interrupting capacity.

2.	Run bus at top of switchgear.

3.	Run bus at bottom of switchgear.

NOTE: NOT RECOMMENDED.

4.	Ground bus shall run inside equipment with bracket to each cubicle with a capacity 20.

5.	Allow for future extension of bus.

6.	Provide clearance and spacing as required by code.

7.	Provide silver plate bus connection.

8.	Provide tin plate bus connection.

C.	Metering Cubicle shall include fused potential transformer, current transformers, lightning arrestors, phase or ground indicator lights, Utility Co. metering equipment, ammeter, including selector switch and voltmeter, including selector switch.

D.	Provide Air Load Interrupter Switches with ratings as follows:

1.	-----kv, nominal ----kv maximum.

NOTE: 4.76 FOR 4.16 KV, 17 KV FOR 15 KV, 27 KV FOR 25, 38 FOR 34.5 KV

2.	-----kv insulation tests.

NOTE: 19 KV FOR 5 KV, 36 KV FOR 15 KV, 80 KV FOR 34.5 KV.

3.	-----kv basic impulse level (BIL).

NOTE: 60 KV FOR 5 KV, 95 KV FOR 15, 125 OR 150 FOR 25, 150 OR 200 KV FOR 34.5 KV

4.	-----amp continuous.

5.	-----amp, momentary current capacity.

6.	-----amp, symmetrical interrupting capacity.

7.	3 pole.

8.	Switches shall be manually operated.

9.	Switches shall be power operated.

a.	Provide wiring for operator.

10.	Switches shall be free of arcing or ionized gas production.

11.	Switch blades shall not open until clear of main contacts by a distance greater than the external flashover distance. Interlocking blades shall prevent incomplete switch closing.

12.	Provide key interlock as required.

13.	Provide ground position for switch as shown on drawings, key operated.

E.	Oil Switch: (same as Air Switch).

NOTE: OIL SWITCH IS SMALLER IN SIZE AND COST. (IT IS COMPLETELY SUBMERSIBLE). USED INDOORS, REQUIRES SPECIAL DRAINS AND OIL COLLECTOR PITS

F.	Provide bus tie switch or bus insulation switch as follows:

1.	Normally open.

2.	Key interlock with incoming feeders.

3.	-----amp continuous.

4.	Refer to schedule for ratings.

5.	Non-load break.

G.	Provide fuses with rating as follows:

1.	-----kv.

2.	-----amp continuous.

3.	-----mva, 3-phase, symmetrical short-circuit interrupting capacity at ----- kv.

4.	Provide 3 spare fuses for each type used.

5.	All fuses shall be of the same manufacture.

6.	Provide fuse handling tool.

7.	Provide current-limiting fuses.

H.	Terminators: Provide all necessary potheads and/or stress cones for termination.

I.	Lightning arrestors: Provide ----- kv class for use on system operating at ----- kv. Provide ground for lightning arrestors as required.

3)	INTEGRAL TRANSFORMERS (UNIT SUBSTATION TYPE)

A.	Ratings shall be as follows:

1.	-----kv primary voltage, 3 phase, 3 wire.

2.	-----kva capacity.

3.	-----v secondary voltage, 3 phase, ----- wire (delta or wye).

4.	Basic impulse level: ----- primary, ----- secondary.

5.	Impedance: -----.

6.	Noise level: NEMA standard.

7.	Temperature rise, ----- deg C, average rise, ----- deg C insulation, ----- deg C hot spot rise, ----- deg C maximum ambient.

8.	Taps -----.

9.	Provisions for future forced air cooling to increase capacity 33.

10.	High temperature alarm.

11.	Bus connection to transformer.

B.	Type: Provide two winding, ventilated dry type.

C.	Type: Provide two winding, non-ventilated dry type.

D.	Type: Provide two winding, gas filled sealed dry type with sealed tank.

E.	Type: Provide two winding ventilated dry cast coil (primary).

F.	Type: Provide two winding, ventilated dry cast coil (primary and secondary).

NOTE: INDICATE TYPE OF FLUID: OIL, SILICONE OR TOTALLY NON-FLAMABLE FLUID)

G.	Type: Provide two winding, sealed tank, liquid filled, factory vacuum filled.

H.	Accessories and devices: Provide standard features and accessories and devices, including the following:

NOTE: USE 1. THROUGH 10. FOR OIL TYPE ONLY.

1.	Dial thermometer with alarm contacts.

2.	Liquid level gauge, magnetic, with alarm contacts.

3.	Resume vacuum gauge.

4.	Pressure relief device, mechanical, with indicator and contacts.

5.	Pressure vacuum bleeder.

6.	Combination drain valve, lower filter connection and sampling valve.

7.	Upper filter connection.

8.	Sampling device at top liquid level.

9.	Vent plug in cover.

10.	Radiators.

11.	Diagram instruction plate.

12.	Tap changer, no load, externally operated with locking provisions in each tap position.

13.	Provision for tap changing, internal on the primary.

14.	Jacking and towing provisions and skid base.

15.	Lifting hooks.

16.	Ground pads.

NOTE: INCLUDE FOR OUTDOOR TYPE.

17.	Lightning arrestors connected to the high voltage leads.

NOTE: DELETE FOR CAST COIL TYPE.

18.	Vibration dampers: between frame and housing.

NOTE: PROVIDE FOR DRY TYPE NON-CONTINUOUSLY ENERGIZED TRANSFORMERS. INCLUDE BRANCH CIRCUIT FOR APPROXIMATELY 500 WATTS. CHECK VOLTAGE WITH MANUFACTURER TO PROVIDE MANUFACTURER RECOMMENDED SPACE HEATERS IN ENCLOSURES OF NON-CONTINUOUSLY ENERGIZED TRANSFORMERS

NOTE: FOR GAS FILLED DRY TYPES, INCLUDE 19 THROUGH 21.

19.	Packless valve for filling and test.

20.	Plug for purging.

21.	Dial-type gas thermometer with alarm contact.

22.	Vacuum pressure gauge.

I.	Enclosure shall be indoor.

J.	Enclosure shall be outdoor.

NOTE: FOR CAST COIL INCLUDE D, E, F AND G.

K.	Core shall be cold rolled, high permeability silicon steel.

L.	Coil conductor material shall be copper.

M.	Insulation shall be vacuum cast resin.

N.	Casting shall be vacuum cast primary and secondary.

O.	Casting shall be vacuum cast primary.

4)	LOW VOLTAGE

A.	Bus, fuse switch or circuit breaker shall be as indicated on secondary side of transformer.

B.	Contain circuit protective devices as indicated.

C.	Provide required metering equipment.

D.	Refer to Low Voltage section of specification.

Part 3 -	EXECUTION

1)	INSTALLATION

A.	Mount on 4 inch pads with channels.

B.	Provide rubber mats.

C.	Provide special tools as required for routine maintainance and inpection of equipment.

D.	Provide fuse cabinet with 3 spare fuses of each type.

2)	TESTS

A.	Factory test.

1.	Medium voltage switchgear: Provide factory tests in accordance with NEMA, ANSI and IEEE standards.

2.	Transformers: Perform factory tests in accordance with all applicable NEMA, ANSI test codes. Include the following:

a.	Winding resistance.

b.	Potential - applied, induced.

c.	Impulse.

d.	Efficiency.

e.	Exciting loss.

f.	Excitation current.

g.	Impedance and load loss.

h.	Ratio.

i.	Temperature rise.

j.	Polarity and phase relation.

NOTE: FOR CAST COIL TYPE.

k.	Partial discharge test.

B.	Field test.

1.	Air switches:

a.	Perform insulation resistance test on each phase to ground and from phase to phase.

b.	Perform overpotential test on each pole-to-ground and pole-to-pole.

c.	Perform contact resistance test across each switch blade and fuse holder.

d.	Test values: Contact resistance shall be determined in micro-ohms. Any value exceeding 50 micro-ohms or any values which deviate from adjacent poles or similar switches by more than fifty percent (50) should be investigated.

2.	Medium voltage switchgear.

a.	Insulation resistance test: Measure insulation resistance of each bus section phase-to-phase and phase-to-ground for one (1) minute. Test voltage and minimum acceptable values in accordance with Section C.

b.	Overpotential test: Perform overpotential test on each bus section phase ground. Potential application shall be for one (1) minute. Test voltage shall be in accordance with Section C and/or manufacturer's recommendations.

c.	Control wiring insulation test: Measure insulation of control wiring to ground.

d.	Control wiring performance test: Use the elementary diagrams of the metal clad switchgear to identify each remote control and protective device. Conduct test as required to verify satisfactory performance of each of these control features.

e.	Test values:

(1)	Bolt torque levels shall be in accordance with U.S. Standard Bolt Torques for bus connections.

(2)	Insulation resistance test shall be performed in accordance with ANSI Standards.

(3)	Values of insulation resistance less than manufacturer's minimum or 1 megohm should be investigated. Overpotential tests should not proceed until insulation resistance levels are raised to said minimum.

3.	Liquid filled transformers:

a.	Insulation resistance tests shall be performed winding-to-winding and winding-to-ground. Appropriate guard circuit shall be utilized over all bushings. Test voltage shall be 1000 V DC.

b.	A turns ratio test shall be performed between windings for all tap positions. The final tap setting will be determined by the owner and set by the testing company.

c.	Measure secondary voltage phase-to-phase and phase to ground after final energization and prior to loading.

d.	Perform special tests and adjustments as suggested manufacturer on tap changer, fan and pump control and alarm functions.

4.	Dry type transformers:

a.	Insulation resistance tests shall be performed winding to winding and winding-to-ground. Test voltage shall be 1000V D.C.

b.	A turns ratio test shall be performed between windings. The results shall not deviate more than one-half of one percent (0.5 percent) from calculated ratio.

c.	Overpotential test shall be made on all high and low voltage winding-to-ground.

d.	Perform special tests and adjustments as suggested by manufacturer for fans, controls and alarm functions.

e.	Measure secondary voltage phase-to-phase and phase-to-ground phase after final energization and prior to loading.