To synchronize a 550 kVA generator and a 330 kVA generator, you need to follow specific steps to ensure the generators operate together safely and effectively.
Here are the main steps: –
1. Ensure Compatibility Voltage:-
Both generators must have the same output voltage. For example, if one generator is rated at 400 V, the other must also output 400 V. Frequency: Both generators must be running at the same frequency, typically 50 Hz or 60 Hz, depending on your region. Phase Sequence: Both generators must have the same phase sequence. This is checked by measuring the phase rotation of both generators.
2. Install Synchronization Panel:-
You will need a synchronization panel (also known as a synchronizer or paralleling panel) to handle the synchronization process. The panel typically includes: Voltage Adjusters Frequency Adjusters Phase Matching Equipment Circuit Breakers: These will disconnect either generator if synchronization fails or if there’s a problem during operation.
3. Automatic vs. Manual Synchronization :-
Automatic Synchronization: This is often done using a synchronizing relay or controller. It continuously monitors the generators’ parameters and adjusts them to synchronize. Manual Synchronization: If manual synchronization is preferred, you’ll need to manually adjust the speed (frequency) and voltage of the generators to match before closing the breaker.
4. Synchronization Process:-
Step 1: Start the larger generator (550 kVA). Allow it to stabilize at rated voltage and frequency.
Step 2: Start the smaller generator (330 kVA) and bring it to the same frequency and voltage as the first generator.
Step 3: Use the synchronization panel to match the frequency and phase of the 330 kVA generator with the 550 kVA generator.
Step 4: Once frequency, voltage, and phase angle are matched, close the breaker to connect the smaller generator to the system.
5. Load Sharing
After synchronization, ensure proper load sharing between the two generators. The load distribution will depend on the capacity of each generator:
550 kVA Generator: Should take a larger share of the load due to its higher capacity.
330 kVA Generator: Should take a proportionally smaller share.
This can be controlled via the load sharing system on the synchronization panel.
6. Protections
Both generators must have adequate protection devices like over current protection, reverse power protection, and other generator protection relays to ensure safe parallel operation. Proper synchronization ensures that the generators work together without causing instability or damage to the system or the generators themselves.