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NCSA-01 58920002 ABB Protects the DC output from voltage effects

$899.00

In stock

model:NCSA-01 58920002

Order (minimum order quantity): 1

Payment: telegraphic transfer
Product origin: Sweden
Port of shipment: Xiamen, Fujian
Hotline: 18165687102

E-mail:2804538582@qq.com

The half controlled (1-Q) field exciters DCF803-0050 / DCF803-0060 include the SDCS-FEX-82,

two thyristor/diode power modules and auxiliaries (power supply, line reactor L1).

The full controlled (4-Q) field exciters DCF804-0050 / DCF804-0060 include the SDCS-FEX-81,

four anti-parallel thyristor power modules and auxiliaries (power supply, line reactor L1).

The control structure is similar to the SDCS-FEX-4 in single-phase operation. A micro controller is

used for controlling the field current and firing. The DC current is measured using an AC current

transformer

The control unit includes the following main blocks:

– Micro controller H8 for control and firing.

– Actual DC current measurement using an AC current transformer.

– High ohmic measurement of AC and DC voltage.

Residual resistance to ground = 3.5 M(DCF803

= 1.9 M(DCF804)

– RS485 interface and DCSLink interface to the converter’s controller board SDCS-CON-H01.

– The firmware of the field exciter is stored in a flash memory and contains:

– The PI current controller for the field circuit.

– The fault and reset logic.

– The synchronization and PLL function.

– The bridge reversal function (only DCF804-0050 / 0060).

All control parameters are set from armature converter via drive-to-drive communication. The field

current reference, actual field current, current control and status bit are cyclic sent via drive-to-drive

communication.

The field exciter is equipped with an autoscaling function of the burden resistors based on the

nominal field current of the motor.

Power part

The DCF803-0050 / 0060 is a half-controlled single-phase bridge. A half controlled bridge does not

need a free wheeling circuit.

The DCF804-0050 / 0060 is a full-controlled single-phase bridge. During normal operation it is fired in

half controlled mode to reduce the current ripple.

Full controlled bridges require separate freewheeling circuits. The firing control enables the

freewheeling of a thyristor if the DC voltage increases. See also parameters 28.62 and 42.67 in the

armature converter.

A MOV (Metal Oxide Varistor) protects the AC input against voltage spikes from the mains.

Another MOV protects the DC output against voltage

surges which can be caused by the field

winding of a DC machine.

The power section is equipped with a line reactor (L1). Thus an external line reactor is not needed.

Single-phase field exciters are typically supplied by autotransformers if the rated field voltage is less

than 60 % of the AC supply voltage.

 

 

NCSA-01 58920002 ABB Protects the DC output from voltage effectsillustration

 

The prices of all products of Zhangzhou Fengyun may fluctuate at any time. The specific price is subject to the customer service quotation. Please confirm the model, product, price and other details with the customer service before placing the order. Second-hand and brand-new products are sold in the store. Please contact the customer service for details.

 

NCSA-01 58920002 ABB Protects the DC output from voltage effectsillustration1

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