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MTL-Series Unit Substation Switchgear
Unit Substations with Primary Voltage of 2.4kV-38kV, Transformers kVA: 500-20,000 kVA, & Secondary Voltage: 208V-15kV
APT MTL-Series Secondary Skid-Mounted Unit Substation Switchgear consists of Low & Medium Voltage Switchgear with a power transformer. Moreover, these three units work together to bring service power to the largest facilities. Our MTL-Series certainly offers versatile substations with several configurations.
General Features
- Built to IEEE Std C37.121-2012: IEEE Guide for Switchgear – Unit Substation – Requirements
- Frequency: 60Hz or 50Hz
- Silver plated copper bus
- Listed low voltage bus ampacity up to 4000A
- Unlisted options built to UL standards available upon request for main buses larger than 4000A
- Busbar connections with NEMA standard hole pattern
- Front or Rear Bus Access for either top or bottom cable entry
- Low Voltage Power, Insulated Case Circuit Breakers, or Molded Case Circuit Breakers:
- See page 9 of APT MTL-Series Unit Substation Switchgear Brochure for more information
- Installation Location & Enclosure:
- NEMA 1 for Indoor Installation
- NEMA 3R for Outdoor Installation
- Manufactured from Carbon Steel, Aluminum or Stainless Steel (304 or 316)
- Powder coated ANSI 61 Gray
- NEMA 1 Lockable T-handles
- Internal Climate Control (requires 120VAC)
- Anti-condensation Heater w/Thermostat
- NEMA 3R Stainless Steel hardware & pad lockable handle
- Optional Power System Mimic Bus
Medium Voltage Unit Sustation Switchgear Features
- Ratings: 2.4kV – 38kV, 3Ø
- Main Protection Disconnect Sections Options:
- IEEE Std C37.20.2 – Metal-clad Drawout Vacuum Circuit Breaker
- IEEE Std C37.20.3 – Metal-enclosed Fused Air Insulated Loadbreak Interrupter Switch (LIS)
- Metal-enclosed Unfused Air Insulated Switch with Fixed or Roll Out Vacuum Circuit Breaker
- Metal-enclosed Drawout Vacuum Circuit Breaker
- IEEE 386 – Loadbreak or Deadbreak Bushings with Optional Grounding
- IEEE Std C37.23 – Metal-enclosed Bus Stabs with NEMA Standard 2-hole pattern directly to the transformer or incoming line pull section
Power Transformers
High Voltage Side
- Aluminum windings
- 2.4kV – 34,500 V Delta or Wye connected
- BIL up to 200 kV
- Tap changer: ± 2, 2.5%
- Live front
- Radial feed
- Optional Bushing wells
Common Features
- Up to 4MVA Transformers
- Dry-Type
- Cast-Coil
- Oil-Filled
- Built to all applicable IEEE C57.12.34
- Cooling Class: ONAN
- Pad Mount, Step Down
- Ratings:
- 500kVA – 4,000 kVA
- Frequency: 60Hz
- Impedance: 5.75%
± 7.5% - Temperature Rise: 149°F
- Dead Front or Loop Feed Option
- Enclosure:
- Indoor NEMA 1 or Outdoor NEMA 3R
- Mild steel tank & cabinet
- Powder Paint System; Color: ANSI 70 or Green Munsell 7GY 3.29/1.5
- Weights: 7000-17500 lbs.
Low Voltage Side
- Aluminum windings
- Single Low Voltage Winding
- 208V – 120 V Delta or Grounded Wye Connected
- BIL up to 10kV
- Epoxy 2-piece bushings with 4-holes blade
Low Voltage Unit Sustation Switchgear Features
Transfer & Backup Options
- Automatic Source Transfer for Double Ended Substations:
- Add secondary paths to provide power to your feeders via a double ended substation
- As a result, this enables the ability to feed loads from two different utility or generator sources automatically
- Automatic standby with Open or Closed Transition return operation
- Add secondary paths to provide power to your feeders via a double ended substation
- Backup Portable Substations for Integrated Generator/Load Bank Quick Connection
- Adds the ability to connect temporary power to your unit substation/unit substation switchgear to provide power to your feeders
- This is done through integrated Generator Quick Connection
- Backup your ability to feed loads manually via temporary generator connection
- Adds the ability to connect temporary power to your unit substation/unit substation switchgear to provide power to your feeders
- Ratings: 208V – 690V, 3Ø
- ANSI/UL 891 Listed & Labeled Low Voltage Main Protection and Feeder Sections Options:
- UL 489 Insulated Case & Molded Case Circuit Breakers
- Built to IEEE Std C37.20.1 with UL 1066 Listed Low Voltage Power Circuit Breakers
- Interrupting Rating: 18kA – 200kA @ 480VAC
- Circuit Breaker position Aux Contacts (“a” and “b”)
- Your Choice of Circuit Breakers:
- Low Voltage Power Circuit Breakers (LVPCBs)/Insulated Case Circuit Breakers (ICCBs):
- Available from 100A up to 6000A
- LVPCBs UL® 1066 Listed
- ICCBs UL® 489 Listed
- See page 9 for table of available circuit breaker frame ratings
- Electrically or Manually Operated
- 100% Rated
- Fixed Mounted or Drawout
- Electronic Trip Units – LI, LSI, LSIG
- Molded Case Circuit Breakers:
- UL® 489 Listed
- Available up to 3000A
- Manually Operated
- Electrically Operated with Motor Operator Add-on
- Standard or 100% Rated
- Fixed Mounted
- Thermal Magnetic or Electronic Trip Units – LI, LSI, LSIG
- Low Voltage Power Circuit Breakers (LVPCBs)/Insulated Case Circuit Breakers (ICCBs):
Motor Starting, Protection, & Control
- Add Motor Starting Capability to your Secondary Unit Substation Switchgear
- Single Phase and Three Phase (115V – 575V) motor controls
- 0.5HP – 400HP drives in a single standard section
- Over 400HP through 800HP drives can be housed in larger custom sized sections
- Hand-Off-Auto control switches and activity indicating lights gives users the ability to control motors from the control panel
- Terminal blocks as needed for customer field connections
- Able to house:
- Variable Frequency Drives
- Motor SoftStarters
- Manual Starters
- Motor Controller Contactors
- Overload Relays
- Full Voltage Non-Reversing or Reversing Starters
- Air Flow cutouts ensure proper cooling for the number of devices