Stationary
Mars-HV
500KW
600KW
750KW
800KW
900KW
1000KW
1200KW
2.5KV
5.0KV
8.7KV
15KV
Mars-HV
Load Bank
The Mars-HV is a self-contained
Load Bank to 15KV utilizing the Simplex Mars Load Module with
on-board dry-type power transformer. It is a self-contained,
freestanding, semi-portable skidded unit consisting of three
principle sections:
1. High voltage section consisting of main input power terminals,
high voltage: 480V 3-phase power transformer, low voltage output
terminals, low voltage fuses and outputs to load cell
2. 480V, low voltage resistive load section consisting of one
500-1200KW forced air-cooled load cell
3. Control Section
All control circuits and control power supplies are powered internally.
The Mars-HV requires connection of a 3-phase feeder only.
Load circuits and cooling fan operate at 480V; control circuits
operate at 120V.
Input disconnects, fuses, lightning arrestors and potheads available
as options.
Construction
All panels for access to serviceable components are hinged doors
with stainless steel hinges and lockable latches. All exterior
fasteners are stainless steel.
The Load Bank enclosure is double wall constructed for a cool
exterior and thermal isolation of the load elements. Cooling
airflow through the enclosure is vertical with cold air intake
at the bottom and hot air exhaust out the top. Intake and exhaust
openings are screened. Exhaust is straight up with no flow to
any side. Exhaust flow is directed through rain and snow shedding
louvers.
Features
Master load toggle switch
and load step toggle switches
Self-contained load and control
system
Utilizes the UL Recognized “Powr-Web”
load element
Branch circuit
fuse protection of load elements
Color coded and numbered wiring; power wiring 150°C
Plated bus bar
Options
Input disconnect switch,
5KV or 15KV class
Input fuses
Lightning arrestors
5KV or 15KV Potheads
Low voltage (480v secondary) disconnect switch
Automatic load regulating
features
Automatic regenerative power control features
Instrumentation, analog or digital
Capacity 500KW, 600KW, 750KW, 800KW, 900KW, 1000KW, 1200KW; Resistive, 1.0 p.f. Voltage to 15KV AC, 3-phase (typical: 2400V, 3300V, 4160V, 13,200V, 13,800V) Load circuits operate at 480V via main power transformer Frequency 50, 60 Hertz Load Steps 50 KW resolution standard 1-5-10-25KW resolution available Fan/Control Internal via high voltage: 480V, 3-phase transformer for fan power, 480:120 transformer for control circuits. Cooling Forced air, vertical airflow, top exhaust. 3-phase, TEFC motor driving cast aluminum fan blade. Circuit breaker combination motor starter. Airflow 24,000 CFM Duty Cycle Continuous Dimensions 78”W x 118”H x 137”D Enclosure NEMA-3R control section; NEMA-3R power section Power Wiring 150°C insulated; color coded Control Wiring 105°C, color coded and/or numbered Power Connection Plated bus bar within an oversize NEMA-3R, terminal junction box Sales Bulletin Dimensions and Key Features Diagram Stationary Load Banks: Applications and General Specifications, Features and Options, and Engineer’s Specifications |
Principle Systems and Components
High voltage input terminals:
silver-plated copper bus bar
Transformer
Dry type transformer
700-1200KVA, continuous duty
High voltage delta, 3-wire primary
480V wye, 4-wire secondary with grounded neutral
220°C insulation
150°C rise
Insulation Level, Primary
System Voltage - BIL
2.5KV - 20KV
5.0KV - 30KV
8.7KV - 45KV
15KV - 60KV
Insulation Level, Secondary
10KV BIL
Output Circuits
Secondary of transformer connected to output fuse circuit
Simplex “Powr-Web” open wire, helically wound, chromium alloy, thermally derated to 60%. 5% tolerance, 2% balance, .995 p.f.
UL Recognized.
Load Control
Branch circuit contactors, each 50 KW step. Contactors have enclosed silver surfaced contacts, 120V coils; electrically operated and electrically held.
Element Circuit Protection
Branch circuit fuses, each 50KW branch circuit, 70A, 200kAIC, current limiting type.
Temperature
Maximum air intake: 120°F
Maximum ambient: 120°F
Exhaust rise: 150°F
(Note: As airflow is not laminar, exhaust air temperatures are not equal at all points at the plane of air exhaust. Some parcels of air may reach approximately 575°F before mixing.)
Power transformer and load source connections
System Protection
Fan failure, high exhaust temperature, high intake temperature; lockout and alarm.
