Factory assembled, integral construction ensures an approved substation installation at a lower cost than conventional substations, as fencing and large ground grids are not required.

Aesthetics

Low profile design allows positioning of the unit in high profile areas on the customer’s property without reserve.

Compliance

The equipment is designed and built to comply with Electrical Safety Authority and supply authority requirements as tamper proof, high potential, customer owned equipment. The unit is tamper proof in every aspect required by ESA Bulletin 36-6-12.

High Voltage Cable Compartment

A separate tamper proof compartment provides ample space for the high voltage terminations and allows for a loop feed to other units.

Low Voltage Compartment

A separate tamper proof compartment provides ample space for low voltage cable connections, cell heaters, grounding resistor (for 3 phase, 3 wire installations), and ground bus pads.

Control Compartment

A separate compartment encloses the gauges, sampling valve, tap changer, and fan controls without entering into the live power areas.

Standard Features

• Penta head bolt for access to each compartment

• Anti condensation heaters in fuse compartment

• Light grey epoxy baked finish for improved visibility inside the compartment

Switch and Fuse Compartment

• S&C Electric 3 pole gang operated load interrupter switch.

• S&C Electric SMU-40 fuses for improved transformer protection and systemcoordination.

• MOV intermediate class polymer lightning arresters.

• High conductivity bus, mounted on CYPOXY supports.

Typical Specifications and Ratings

The unit padmount is outdoor weatherproof and is suitable in every aspect for installation without the use of fencing. The tamperproof assembly of transformer and switchgear is an integral assembly containing all necessary equipment as described below. The unit padmount substation has provision for high and low voltage cables to enter from below. Optional front or rear exit for busduct, flexibus, or cable and tray are possible.

_{Note: Other winding configurations, BIL ratings, and voltages are available. Only Standard KVA sizes and voltages are provided from stock, subject to prior sale. Specifications are subject to change without prior notice.}

CSA C22.2 NO. 31 EEMAC G8-2 CSA C22.2 NO.193 NEMA SG-5 CSA C233.1 CSA C227.2-88  CSA 802-94 (Option) ESA Bulletin 36-6-12

Transformer

The padmount transformer is provided with the ratings as shown above. The transformer is oil filled. ONAN, 65° rise, built to CSA C227-2 and complete with ALL accessories as further specified.

• 3- High voltage transformer bushings

• 1- High voltage neutral bushing (insulated)

• 4- Low voltage epoxy spade bushings

• External tap switch c/w 4-1/2 % taps, 2-FCAN, 2-FCBN

• Pressure relief valve

• Oil fill and drain plugs

• Oil sampling valve

• Top oil thermometer

• Oil level indicator

• Grounding pads

• Separate control compartment

• Provision for fan cooling

Switchgear

The metal enclosed switchgear is constructed of 11 gauge flat rolled steel and welded construction. All doors have padlock provisions and shrouded penta head bolts to provide tamper proof access. Separate doors provide access to the high voltage termination compartment, high voltage switch and fuse compartment, low voltage compartment, and a safely positioned area for gauges, tap changer, and fan controls.

The fuse compartment door is interlocked with the high voltage switch to prevent access to live fuses. For spare fuse refills, a holder is provided on the inside of the compartment door. This compartment is also provided with an anti-condensation heater, and the underside of the roof is treated with an anti condensation compound. Metal work is prepared for painting by degreasing and cleaning. A process of electrostatically applied primer and final finish coats of ASA 70 light grey is utilized to provide an epoxy baked finish with an even thickness of two mils.

The bus work is high conductivity aluminum (copper optional), mounted on non tracking skirted CYPOXY standoff insulators to provide the short circuit and impulse withstand levels required. A copper ground bus of withstand rating equal to that of the assembly is provided with adequate lugs for substation grounding.

The switchgear will contain components that have been factory tested as a complete unit and will include:

• 1- S&C 600 AMP, 3 pole load interrupter switch.

• 3- S&C 400 AMP, SMU-40 power fuses.

• 6- fuse refills sized to protect the transformer, 3 to be installed and 3 to be used as spares.

• 3- MOV intermediate class polymer lightning arresters.

• Provision for incoming cable terminations, two hole NEMA lugs to be provided.

• All necessary bus, supports, hardware, and barriers.