Low Voltage Switchgear
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| Illustration 1 | g00842683 |
Front View (1) Circuit protection for components of the power module (2) Panel for wiring connections for the power module (3) Panel for the touchscreen display and controls (4) Compartment for the motor contactor for the radiator fan (5) Transformer primary breaker and main distribution breaker (6) Transformer for distribution (37.5 kVA, 480:240/120 ACV secondary) (7) Compartment for the generator circuit breaker and protective relays | |
The components of the switchgear are contained in two cabinets. All operational interface functions for the genset are performed by the devices that are located on the doors of the right cabinet. The general layout and general component locations are shown in illustration 1.
The panel for wiring connections for the power module (2) contains the following items:
- Wiring connections for the power module
- Circuit breakers for the distribution of AC power
- Switches for AC
- Circuit breakers for the distribution of DC power
- Switches for DC
- Battery charger
- Distribution relays for the source selective power
- Control circuit for the louver assembly (optional equipment)
- Heater for the compartment
The panel for the touchscreen display and controls (3) contains the following items:
- Touchscreen display
- Engine controls
- Generator controls
- Annunciator
- Paralleling controls
- Loading controls
- Wiring connections for control by the customer
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| Illustration 2 | g00842685 |
Rear View (8) Connections for the fan motor (factory connections) (9) Transformer for power distribution (37.5 kVA, 480:240/120 ACV secondary) (10) Connections for the generator (factory connections) (11) Transformer for ground current (12) Neutral for the system (13) Connections for the load (customer connections) | |
Illustration 2 shows the locations of the components that are accessible from the back of the cabinet. Access to the rear components is through the exterior bus access doors of the power module and removable panels of the switchgear. For clarity, the panels have been removed.
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| Illustration 3 | g00853335 |
Detail of the Rear View (10) Connections for the generator (factory connections) (11) Transformer for ground current (12) Neutral for the system (13) Connections for the Load (customer connections) | |
The panels must be replaced before you energize the utility bus. The panels must be replaced before you energize the bus for the generator.
Medium Voltage Switchgear
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| Illustration 4 | g00842681 |
Front View (14) Door for the radiator fan contactor (15) Panel for touchscreen display and controls (16) Compartment for the generator circuit breaker (17) Panel for relays and power distribution | |
The components of the switchgear are contained in two cabinets. All operational interface functions for the genset are performed by the devices that are located on the doors of the right cabinet. The general layout and general component locations are shown in illustration 4.
The contactor for the circuit for the fan motor is rated at 5 kV. The door for the radiator fan contactor (14) is electrically interlocked. When the door for the radiator fan contactor (14) is opened, the generator circuit breaker is tripped and the genset is shut down.
The panel for touchscreen display and controls (15) contains the following items:
- Touchscreen display
- Engine controls
- Generator controls
- Annunciator
- Paralleling controls
- Loading controls
- Wiring connections for control by the customer
- Wiring connections for the power module
A heater for the compartment is provided.
The panel for relays and power distribution (17) contains the following items:
- Generator multifunction relay (GMR)
- Utility multifunction relay (UMR)
- Generator differential relay (optional equipment)
- Circuit breakers for power distribution
- Distribution relays for source selective power
- Control circuit for the louver assembly (optional equipment)
- Battery charger
- Drawout fuses
- Main distribution breaker
- Fuses
The fuses are used with the secondary winding of the potential transformer. These fuses are for the utility bus.
The compartment for the generator circuit breaker (16) contains a drawout generator circuit breaker that is rated at 5 kV. A heater is provided for the compartment.
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| Illustration 5 | g00842682 |
Rear View (18) Ground for the system and ground for the equipment (19) Neutral for the system (20) Potential transformers and fuses for the generator bus (21) Potential transformers and fuses for the utility bus (22) Station class type of lightning arresters (23) Surge capacitor (24) Connections for the motor circuit for the radiator fan (factory connections) (25) Connections for the generator (factory connections) (26) Transformer for power distribution (37.5 kVA, 4160:240/120 ACV) (27) Connections for load (customer connections) (28) Heater for the termination compartment (29) Transformer for ground current (not shown) | |
Note: The potential transformers and fuses for the generator bus (20) are connected to the generator bus. The potential transformers and fuses for the utility bus (21) are connected to the utility bus. The station class type of lightning arresters (22) are connected to the generator bus. The surge capacitor (23) is connected to the generator bus. There are three 6 kV station class type of lightning arresters (22). There is one 3 phase 7.5 kV surge capacitor (23) .
Illustration 5 shows the locations of the components that are accessible from the back of the cabinet. Access to the rear components is through the exterior bus access doors of the power module and removable panels of the switchgear. For clarity, the panels have been removed.
The panels must be replaced before you energize the utility bus. The panels must be replaced before you energize the generator bus.
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| Illustration 6 | g00850915 |
Interior of the lower right compartment (medium voltage switchgear) (30) Mechanically interlocked secondary breaker for the transformer for power distribution (26) and potential transformers for the utility bus (21) (31) Drawout primary fuses for the transformer for power distribution (26) and potential transformers for the utility bus (21) | |
The load must be removed from the transformer for power distribution (26) before the drawout primary fuses for the distribution transformer (31) may be removed. The drawout primary fuses for the distribution transformer (26) and the potential transformers for the utility bus (31) must be removed before the potential transformers and fuses for the utility bus (21) may be removed.
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High voltage may be present. The power source must be disconnected before working on the equipment. Failure to disconnect the power source could result in injury or death. Verify that the equipment is not energized before performing any maintenance. This work must be performed by trained personnel with correct tools and procedures. Bodily contact with electrical potential will cause personal injury or death. |