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ABB SPAJ110C ground fault relay

From: | Author:Wang | Time :2024-12-16 | 81 visit: | Share:

ABB SPAJ110C ground fault relay

The thyristor bridge can be 2-quadrant (6 thyristors)
or 4-quadrant (12 thyristors). For current ratings
up to 700 A the thyristor bridge consists of
integrated thyristor modules – more compact,
cost effective, less components – so the fuses are
installed outside the module, in the supply line.
For higher current ratings, disc thyristors are
used, so there is a branch fuse for each thyristor.
Each thyristor is protected by a snubber circuit.
AC voltage, AC current and DC voltage are
monitored. These measurements are utilized by
the converter software for supervision and protection. Overvoltage protection by means of
varistors is also provided.
Converters are always equipped with a cooling
fan integrated in the converter module.
The monitor and protective features, provided as
standard and listed below, have been designed,
keeping in mind, personnel safety, equipment
integrity and continuity of the process.
Motor: Loss of speed feedback
Overtemperature
Overload
Overspeed
Stall
Armature overcurrent
Armature current ripple
Armature overvoltage
Minimum field current
Field overcurrent
Converter: Thyristor temperature
Supply: Main supply undervoltage
Auxiliary supply undervoltage
Wrong phase sequence
The converter includes emergency stop and prevention of unexpected start-up as standard protective functions. The software also includes a
fault logger storing up to 100 faults in real time.
Information on internal signals is stored in the
data logger and it can be displayed by the
Commissioning and Maintenance Tool for easy
fault finding.
Converter software for application,
drive, and torque control
Drive Control receives either speed or torque
reference and gives a torque reference to the
Torque Control.
Torque Control is controlling the armature current, the field current and the EMF. It receives the
torque reference from the Drive Control or from
the Application Controller (APC). Auto/manual
tuning for armature current simplifies the commissioning and makes the tuning procedure

flexible.

Several Solutions

• Ratings from 6 to 450 A
• Integrated, separate or external
• 2-phase or 3-phase versions
• Digital control
• Auto/manual tuning
In the DCV 700, an autotransformer is included to
reduce voltage ripple in the field circuit by adapting
the AC voltage to a suitable level.
The field exciters are controlled via a serial link with
a speed of 62.5 kBaud for fast and accurate control.
Fig. 3 shows the connections of the field exciter.
Diode Field Exciter
2-phase, integrated in the converter module, 6 A
The diode field exciter is a diode bridge rated up to
6 A with internal minimum field supervision, without
any need for adjustment.
Digital Controlled Field Exciters
2-phase, 1-quadrant, integrated in the converter
module, 16 A
(max. 6 A in converter modules up to 50 A max.
8 A in converter modules up to 75 A, max. 16 A
in converter modules 110...700 A)
Half controlled thyristor/diode bridge, microproces sor controlled with the electronics supplied from the
armature circuit converter. To achieve high resolu tion in current measurement, the current feedback
can be adapted to different current levels such as 3,
5, 7, 9, 11, 13, 15, 17 A.
Insulation voltage 600 V, operation voltage ≤ 500 V.
2-phase, 1-quadrant, outside the converter mod ule, 50 A
Half controlled thyristor/diode bridge, microproces sor controlled, with separate power supply (115/230
VAC) for the control electronics. To achieve high
resolution in current measurement, the current feed back can be adapted to different current levels such
as 3, 5, 7, 9, 11, 13, 15, 17, 21, 27, 33, 39, 45, 50 A.
Insulation voltage 700 V, operation voltage ≤ 500 V
(for operating voltages higher than 500 V an adap tation via T3 autotransformer is available).
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