Gear unit sizeHollow shaft Shrink disk Screw B4-CV-6-A Bevel-helical speed reducer B4
In stock
SKU
B4-CV-6-A
$8,250.00
Flender/Flender Gear Units/Bevel-helical speed reducer B4
the machine. Loss of Excitation protection is provide by the Alstom ABB Combiflex protective relay package as well as the
SEL -3G protective relay. Page 1 of 2 Malburg Generating Station Generator Protection Setting Review Loss of Excitation is provided 
by the ABB Combiflex relays utilizing directional overcurrent based method. The IEEE C3.1 -2 standard does not discuss he use 
of this method for loss of field protection. However, the Alstom design documents cover this method and provide adequate protection 
for the machines. The SEL -3G uses the more common dual zone mho distance method for loss of excitation protection. Zone 1 diameter set for 1.0 times the machines base impedance with an offset equal to half of the machines direct -axis transient reactance (Xd / . Time delay = 5 cycles. Zone 2 diameter is set for 1.0 times the machines direct axis synchronous reactance (Xd/ with an offset equal to half of the machines direct -axis transient reactance (Xd / . Time delay = 3 cycles. Both Zone 1 and 2 are supervised by loss of potential element to ensure the element only operates when operating voltage is pre sent. The settings utilized are within the IEEE C3.1 -2 standard guidelines. 4.5 Negative Sequence Current -4 Negative Sequence Overcurrent protection, or unbalance current protection, is provided to protect the generator against unbalanced currents. Unbalanced currents can be caused due to unbalanced loads, open phase conductors, or unbalanced system faults. If he generator is subjected to prolonged unbalance currents, the generator rotor can overheat causing severe damage. Negative Sequence protection is provided by the Alstom ABB Combiflex protective relay package as well as the SEL -3G protective relay. The pickup value of the element is set at 1% which matches the machine rating. The permissible 2T is equal to 4, which is provided by the manufacturer. The SEL -3G and Combiflex relays are set with| Model Type | Bevel-helical speed reducer B4 |
|---|---|
| Gear Type | Bevel Helical Gear |
| Weight (kg) | 385.000000 |
| Ratio Range | 1 : 100…400 |
| Low Speed Output | Solid shaft without parallel key |
| Nominal Torque | 15500 Nm |
| Mounting Arrangements | Vertical mounting position |
| Manufacturer | Flender Guss Gmbh & Co. Kg |
| Country of Manufacture | Germany |
| Data Sheet & Drawings | Gear unit sizeHollow shaft Shrink disk Screw B4-CV-6-A Bevel-helical speed reducer B4 |
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