PDJ Marine Switchboard

Product Specifications

Product Description

Applications:
PDJ marine switchboard is applicable to three-phase AC400V/50Hz or AC450V/60Hz ship AC system with unit power ranging from 20KW to 1600KW and ship DC system lower than DC30V for controlling, monitoring and protecting the generator. Switchboard is divided into main switchboard and emergency switchboard. The main switchboard directly connects with the main generator to distribute the power from the main generator or from the shore power station to the secondary distributing device or directly to the power load. If the main switchboard fails, the emergency switchboard supplies power for important equipment such as emergency lighting, steering devices, navigation and radio equipment, etc.
The switchboard complies with requirements of GB11634-88 Marine AC Low Voltage Switchboard-General Specification and GB11803-89 Marine AC Low Voltage Switchboard-Construction and Basic Dimension as well as classification societies.

Structural features:
1. Marine switchboard has three basic structural forms, box type, masked type and framed type.
2. Box switchboard is applicable for small-size switchboard and is welded with flanged steel sheet. It is wall-mounted with opening in the front for maintenance.
3. Masked and framed types are applicable for large- and medium-sized switchboard and assembled and welded with standard frame special section materials. The internal elements apply demountable standing structure which facilitates installation, use and maintenance. It is fixed on the ground with doors both in the front and back for maintenance.
4. Customized types are available.

Main functions of the automatic power station:
1. If the power network fails, the station will automatically starts the diesel generator in 20 seconds to provide power.
2. If the load of the power network is higher than 90% of the unit capacity, the station automatically starts the standby diesel generation set to provide power together through frequency and load adjustment.
3. If the load of the power network is higher than 95% of the unit capacity, the less important loads will be automatically powered off after one minute (adjustable) delay.
4. When the diesel generators run in parallel, if the load of the power network is lower than 40% of the capacity of the station, then the generator set connected later will automatically remove its load and disengage from the power network.
5. Heavy load prompt. When heavy load is applied, it will be prompted and calculated by the automatic generation station. If the capacity of the station allows, it will give starting instruction. If the capacity is less sufficient and the generator runs alone, the station will start the standby diesel generation set automatically. Heavy can only be started when the starting instruction is given by the station to prevent overload trip due to sudden starting of high power machinery.
6. The station has self checking function.
7. The station also has the extension alarm function required by AUTO-O specification.
8. Sequential start-up of the important load.

Main functions:
1. Overload and short-circuit protection of the generator.
2. Over-voltage, under-voltage and power-loss protection.
3. Reverse power protection.
4. Manual or automatic quasi synchronous parallel operation of the generators.
5. Manual or automatic frequency adjustment of the generators.
6. Voltage, current, frequency and power measurement of the machinery.
7. Synchronous inspection of the parallel operation.
8. Shore power interlock
9. Air-fuel remote shift
10. Insulation performance monitoring of the power network
11. Failure alarm handling
12. Grounding failure protection (to be selected)
13. Power load allocation of the parallel operation (to be selected)
14. Overload and load shedding of the generators ( to be selected)
15. Automatic start-up and shutdown of the emergency generator (YK emergency generator automatic start-up device is required)