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TRIM3-EP
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| TRANSFORMER INRUSH CURRENT
MINIMIZER |
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TRIM3-EP digital device has been specially
designed for minimising the inrush current in three-phase power transformers.
The device measures the voltage on the transformer and determines the residual
flux after switching off the transformer. The next energising is synchronised
to the voltage on the supply side of the circuit breaker. The optimal moment
of closing the contact is calculated based on the residual flux values in
the iron cores of the transformer. The closing command is issued according
to the measured operation time of the circuit breaker, which is set as a
parameter.
The version TRIM1-EP is specially designed for single phase power transformers
in railway traction. |
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| Main features |
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- Transformer inrush current minimiser can be an independent device
or can be a function in a complex transformer protection equipment
- Control of circuit breakers with three independent drives. In this
case the inrush current remains in the range of the normal magnetising
current
- Control of circuit breakers with a common drive of mechanical time-delay
of the individual phases: In this case the absolute minimum of the inrush
current can not be guarantied, but the inrush current remains below
the rated current of the transformer
- Possibility to measure voltages on the primary or on the secondary
side of the transformer
- Easy parameter setting
- Easy commissioning
- Built-in self test function with dc supply check, trip/close circuit
supervision and Watch Dog
- One serial communication direction with two ports: (selectable with
a parameter)
- an isolated RS 232 connector on the front plate
- fibre-optic connector on the rear plate
- Two types of event recording:
- event log for storing collected data of the last 50 protection
operations
- event sequence recorder with 1 ms resolution for 300 events
- 16 isolated optical coupled binary inputs
- 8 output contacts with user-defined functions. Each can be NO or NC
- 6 indicating LED-s
- Man-machine communication via external PC or built-in LCD display
- Battery backed-up RAM to store events and running real time clock
- Clock synchronisation with external binary input or on serial link
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| Technical Data |
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Rated secondary current, In
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1 A or 5 A |
| Rated voltage (line), Un |
100 V, 110 V or 200 V |
| Rated frequency |
50 Hz |
Overload capacity, in voltage circuits, continuous
Overload capacity, in current circuits, continuous
1 s |
1,2xUn
2xIn
100xIn (In=1 A), 50xIn (In=5 A) |
| Dynamic current limit |
100xIn |
| Optokaplerski ulazi |
16 pcs, 220 V DC |
| Output contacts |
8 pcs |
Output contacts ratings:
rated switching voltage
continuous load current
switching on current
breaking current at 220 V dc,
pure conductive circuit
L/R=40 ms load
option: L/R = 40 ms |
250 V
8 A
16 A
0,25 A
0,14 A
4 A |
Auxiliary dc battery voltage (the same supply unit)
voltage tolerance
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220 V or110 V
88 V to 310 V |
| Permissive ambient temperature |
0o to 50o C |
| Insulation test (IEC 255) |
2 kV, 50 Hz
5 kV, 1.2/50 µs |
| Disturbance test (IEC 255) |
2.5 kV, 1 MHz |
| Electrostatic discharge (ESD; IEC 801-2) |
8 kV |
| Burst test, (IEC 801-4) |
2 kV |
| Electromagnetic interference (radio frequency) |
IEC 801-3 |
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| Design, size |
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An EuroProt device is always rack-mounted type.
One of the design form is suitable to mount directly into a standard 19"
inch cabinet frame. The other designs are panel mounted devices with raised-hinged
or flush mounted forms.
Its size depend of the chosen design. |
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Design
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Width
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Height
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Depth
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Rack mounting
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483 mm
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132,5 mm
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201 mm
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Panel mounting
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490 mm
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250 mm
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250 mm
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Weight 8 kg. |
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| Optional Functions |
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- Digital fault recorder with 80 sec recording time
- RTU card with IEC 870-5-101,870-5-103, MODBUS protocols and complete
RTU functions
- Additional binary input and output contact cards for RTU tasks
- Graphic LCD display (320x240 pixels) on front plate for displaying
measured values and one-line scheme
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