BDK type marine parallel reactorDetailed product description：

BDK type marine parallel reactor

Domestic small ship generators are usually connected through parallel reactors for rough synchronous connection. That is, the generator is connected to the power grid through a reactor, and after synchronization is stable, the reactor is short circuited and then cut off. The impulse current during synchronization is limited by the reactor. The frequency difference of parallel operation using this method can reach 1-2Hz, and the phase difference can be arbitrary. The reactor is designed as a short-term working system and limits the impulse current to less than 1.2 times. For parallel reactors with iron cores, attention should be paid to the connection of the three-phase windings. In order to prevent the three-phase magnetic fields from canceling each other out, the end of one phase in the three phases needs to be reversed. After the reactor is connected in parallel, once the frequency stabilizes, immediately close the generator switch to short-circuit the reactor, and then disconnect the reactor to prevent it from burning out due to long-term current flow. If synchronization cannot be achieved within the specified time, the reactor should automatically switch out and stop parallel operation.

There are currently three main parallel operation methods used on ships:
1. Manual quasi synchronous method
2. Automatic quasi synchronization method
3. Coarse synchronous method (reactance synchronous method).

Three synchronization methods for merging vehicles:
1. Manual quasi synchronous method
The manual quasi synchronization method is a method of manually adjusting the frequency and phase of the generator to be connected, and conducting parallel operation by manually closing the switch under the condition of parallel operation. This is the most basic method of merging vehicles.  
The manual quasi synchronous method parallel operation steps are as follows:
(1) Manually adjust the excitation current of the generator to be connected, so that its terminal voltage is the same as or slightly higher than the grid voltage;  
(2) Connect the whole step meter (or synchronous indicator light). Adjust the speed of the generator to be connected, so that its frequency is slightly higher than the grid frequency (the frequency difference is required to be within 0.5Hz, that is, the time for the pointer of the whole step meter to turn clockwise once or for the synchronous indicator light to turn on and off once is more than 2s);
(3) Close the switch when the pointer of the whole step meter is about to approach zero (or when the light is close to full darkness);  
(4) Increase the throttle of the newly connected generator set while reducing the throttle of the generator set on the original power grid, transfer the load, and enable the reasonable distribution of active load among the generator sets on the power grid; ‘ 
(5) Disconnect the entire step meter (or synchronization indicator light).  
This method requires strict merging conditions, and the entire process is manually operated, requiring the operator's skills to be proficient. It is suitable for small ship power stations that operate infrequently in parallel, or as a backup method for automatic quasi synchronization.
2 Automatic quasi synchronous method
The automatic quasi synchronization method relies on an automatic parallel device to detect and adjust the frequency and phase of the generator to be connected (voltage can be guaranteed by a voltage regulator), and is a method of automatically closing when parallel conditions are met. This method is convenient, accurate, and has minimal impact on the power grid, but the equipment is complex and requires high maintenance techniques. It is suitable for ship power stations with a large number of parallel generator sets, high power, and high requirements. Automatic quasi synchronous parallel operation is an important part of an automatic power station.
3 Rough Synchronization Method
The coarse synchronous method is a method of connecting the generator in series with a reactor to the grid and pulling it into synchronization when the voltage, frequency, and phase of the generator to be connected are close to those of the grid. This method can greatly reduce the impact current caused by voltage, frequency, and phase differences during parallel operation, as the generator is connected to the power grid through a reactor. Therefore, the requirements for parallel operation conditions can be relaxed.  
The rough and synchronized steps for parallel operation are as follows:;  
(1) Check and adjust the voltage and frequency of the generator to be connected, making it close to the grid voltage and frequency;  
(2) Connect the parallel reactor to connect the generator to the power grid through the reactor;  
(3) After the generator is pulled into synchronization, close the main switch and cut off the parallel reactor at the same time;  
(4) Increase the throttle of the generator just connected to the grid, while reducing the throttle of the generator set on the original grid, to transfer the load,
Reasonably distribute the load among the generator units on the power grid. Finally, disconnect the entire step meter or synchronization indicator light.
The removal of the reactor for rough synchronous parallel operation is divided into two types: manual and automatic. This method, due to the wide requirements for merging conditions and easy operation, many ships use the coarse synchronization method for merging.

The BDK type marine parallel reactor can be used for rough parallel operation of three-phase AC diesel generator sets with the same capacity on ships

model	Unit capacity of equipped generator (kW)	Length x Width x Height (mm)	A(mm)	Weight (kg)
BDK-24	twenty-four	154×202×250	one hundred and eighteen	ten
BDK-40	forty	158×206×230	one hundred and twenty-two	ten
BDK-64	sixty-four	172×222×230	one hundred and thirty-two	thirteen
BDK-90	ninety	168×218×250	one hundred and thirty-two	fifteen
BDK-120	one hundred and twenty	178×228×280	one hundred and thirty-two	nineteen
BDK-250	two hundred and fifty	204×257×280	one hundred and fifty-two	twenty-nine
BDK-400	four hundred	220×284×280	one hundred and seventy	thirty-six
BDK-630	six hundred and thirty	234×298×320	one hundred and eighty-four	fifty
B - "Parallel" vehicle DK - "Reactor"

BDK type marine parallel reactor