Product Description
LEROY SOMER R**8 AVR Automatic Voltage Regulator
For both AREP & PMG excitation systems,the alternator voltage regulator is the R **8. With AREP excitation,
the R **8 electronic AVR is powered by two auxiliary windings which are independent of the voltage equal circuit.
The primary winding has a voltage in ratio to that of the alternator (characteristic Shunt),
the next has a voltage in proportion to the stator current (compound characteristic: Booster effect).
The power supply voltage is rectified and filtered before being used by the AVR monitoring transistor.
With PMG excitation, a permanent magnet generator (PMG) added to the alternator supplies the AVR with voltage
which is free of the main alternator winding. This is builtin at the rear of the machine and connected to the R **8 AVR,
and the ST9 jumper must be disconnected. These two principles provide the machine with a short
circuit current capacity of 3 IN for *0 s, and good protection to distortions generated by the load.
The AVR monitors and corrects the alternator output voltage by adjusting the excitation current.
In SHUNT excitation, R **8 AVR.is supplied by main windings (**0V - *0/*0 Hz) to X1, X2.
On application of a load, the rotation speed of the generator set decreases.
When it passes below the preset frequency threshold the LAM causes the voltage to drop
by approximately *3% or *5% and consequently the quantity of active load applied is reduced by approximately *5% to *5%,
until the speed reaches its rated value again. Hence the LAM can be used either to reduce the speed variation (frequency)
and its duration for a given applied load, or to increase the applied load probable for one speed variation (turbo-charged engine).
To avoid voltage oscillations, the trip threshold for the LAM function should be set approximately 2 Hz
below the lowest frequency in steady state. It is advisable to use the LAM at *5% for load impacts Š *0% of
the genset rated power.LAM, action eliminated by cutting the ST5 jumper. During load impacts, the function
helps the genset to return to its rated speed faster thanks to a gradual increase in voltage according to the principle:
> If the speed drops between *6 and *0 Hz, the rated voltage follows a
fast gradient as it is restored.
> If the speed drops below *6 Hz, since the engine needs more help, the
voltage follows a slow gradient as it returns to the reference value.
The new functions of the R**8 are :
- Parallel operation between alternators with C.T.
- Parallel operation with the mains with C.T.and R **6 module
- *-phase sensing (R **1 module)
- LAM function integrated in the R **8 AVR.
| Country: |
China |
| Model No: |
-
|
| FOB Price: |
80 ~ 90 / Piece (Negotiable)
Get Latest Price
|
| Place of Origin: |
- |
| Price for Minimum Order: |
80 per Piece |
| Minimum Order Quantity: |
1 Piece |
| Packaging Detail: |
STANDARD PACKING |
| Delivery Time: |
WITHIN 7 DAYS |
| Supplying Ability: |
1000 Piece per Month |
| Payment Type: |
T/T, Western Union, PayPal |
| Product Group : |
LEROY SOMER AVR
|
