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Description
3 Description
The CP CR500 is a compensating reactor to enable Dissipation Factor /
Tangent Delta measurements of large generators and motors in combination
with CP TD1. CP TD1 is able to deliver up to 300 mA at 12 kV. With this power,
capacities up to 80 nF can be compensated at 50 Hz. For larger capacities more
current is required.
The CP CR500 contains two inductors. In parallel to the test object it forms a
resonant circuit, which is able to compensate reactive power. By tuning the
frequency via CPC 100 and CP TD1, the circuit can be brought into resonance.
At that time, the CP TD1 is forced to deliver only the effective power while the
current within the resonant circuit can be much higher. Thus, with a single
CP CR500, capacities up to 500 nF at 50 Hz can be compensated.
3.1 Inductors inside the CP CR500
Essential parts of the CP CR500 compensation reactor are two high power
inductors with an inductive reactance of 40 H each. Both are capable to
compensate 1 A. Connected in parallel, 2 A can be compensated by an
inductive reactance of 20 H.
Each of the two inductors is protected by an overcurrent relay that interrupts or
reconnects the safety circuit. The following time table shows the approximate
"ON" and "OFF" times of the overcurrent relay at different currents:
3.2 High-Voltage Sockets
The CP CR500 provides two high-voltage sockets for connecting with the test
object. Two high-voltage cables are also included.
Caution:
– Never touch the high-voltage sockets of the CP CR500 during operation.
Consider these sockets as live, and due to the high voltage life-hazardous.
– The plugs of the high-voltage cables and the cables themselves are not
shielded and therefore not safe. While operating the CP CR500, consider
these cables as live, and due to the high voltage life-hazardous.
Current in A 0.3 0.6 0.8 1.0
ON time in seconds continuous 30 15 10
OFF time in seconds -606080
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