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Electric Power Generation
Installation and maintenance
5747 en - 2018.10 / a
Dual plate D700
13
2.3. Consumption
•
Power supplies:
•
Consumption
< 2A
•
Generator voltage sensing:
•
Consumption
< 2VA
•
Mains voltage sensing:
•
Consumption
< 2VA
•
Stator current measurement with a CT:
•
Consumption
< 2VA
•
Power supply:
•
Consumption
< 3000VA
•
Relay output:
•
Consumption
125VA – 1A max. / 30VDC – 3A max.
Note: The other measurement inputs (mains current, cross-current measurement, etc) and power of the
D700s are still available but are not wired up on this plate. Customer-specific cable ducts can be used to
make these connections (not supplied).
2.4. Wiring precautions
The cable length must never exceed 100 m. To ensure compliance with standards IEC 61000-6-2,
IEC 61000-6-4 and IEC 60255-26, shielded cables are essential in the case of a D700 installed outside the
terminal box.
The total ohmic value of the exciter circuit loop (outward and return) must not exceed 5% of the exciter
resistance, whatever the cable length.
The ohmic value of the power system cables must not exceed 5% of the exciter resistance, whatever the
cable length.
For information, the resistance at 20°C in m
W
/m for copper cables is approximately:
Cross-section (mm²)
Resistance (m
W
/m)
1.5
13.3
2.5
7.98
4
4.95
6
3.3
10
1.91
Example of calculation:
For a 10 Ohm exciter
•
Maximum cable resistance = 0.5
W
(2x0.25
W
)
•
Cross-section according to the distance between the AVR and generator:
Distance (m)
Cross-section (mm²)
30
2.5
50
4
75
6
100
10