Stabiliser; Incremental Filter - ZIGOR FIEM Serie Manual De Operación

Operating Manual

2.2.1 Stabiliser

The FIEM is a constant voltage regulation system made up of two servomotors that operate two
transformers, the configuration of which allows the addition-subtraction of undervoltages or overvoltages
respectively and continuously, obtaining a regulated stabilisation without sharp changes in value.
16
15
1 2
OU T
The motors receive orders from the electronic control board to turn in one way or another depending on
the variations detected by the electronic board. This motor transmits the movement through a number of
toothed gears that act on the highly conductive, hardened carbon bushing. The coil of the auto-
transformer is calculated so that there is a high difference of potential between spirals and in this way to
avoid electric arcs when the bushing moves, as due to the size of the bushing, consecutive spirals are
short-circuited.

2.2.2 Incremental Filter

The Incremental Filter of the FIEM operates when it detects a positive voltage derivation (higher in value
to the nominal voltage of the grid), and it impedance drops the faster the voltage rises. They have a
virtually unlimited number of operations and placed in parallel to share the energies absorbed equally,
which are then amplified in accordance with the magnitude of the disturbances.
The energy absorption capacity is proportional to the number of absorption units installed. In the
standard version, units with an absorption capacity of 300 Jules are fitted in a permanent regime and
1200 Jules in connection transitories. The equipment can be extended to up to 600 Jules in permanent
regime.
The filter has a pre-charging system for the maximum absorption of power in grid recovery situations
where the over voltages provoked by the primary switches of the transformer of 20kVA and 50kVA, or
total catenary voltage drops can be seen more clearly.
The filter has also been sized to absorb overvoltages deriving from other transitories in permanent
regime deriving from distant switch operations and sharp changes in consumption of the load is
connected to the line.
It is important to highlight the advantages of this filter compared to VDR type protections, powertrap, gas
over voltage discharges, etc. The filter fitted to the FIEM is nondestructive and allows undefined
operations. Additionally, it absorbs the power impulses from the nominal voltage compared to other
VDRs or dischargers that are only active as of voltages much higher than the nominal.
6
5 7
6
6
VR -.1
0
23
5
230
260
20
20
21
22
130
T R -1
50
4 2
8
8
VR -2
0
24
MOT OR
7
230
260
21
23 22 24
0 8 16
B .C.-1
20/50kVA FIEM
9 13
10
11
9
12
10 K
12 10 11 17 18 19
13
1774-VO
14
15
16
IN
3
14
4
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