Eaton Power Xpert PXR 10, Руководство пользователя

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3 Protection and measurement functions
3.5 Time/current characteristics
PXR Electronic trip unit 01/21 MN012005EN www.eaton.com
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3.5 Time/current characteristics
The time/current characteristics of the PXR trip units on the NZM circuit
breakers can be found in Eaton’s xSpider software via the link listed below.
3.6 Voltage tap of the neutral conductor on the PXR25
If a 3-pole circuit-breaker is used in a network with neutral conductor
(N-conductor), a voltage tap is necessary to ensure energy metering with
maximum accuracy. The voltage tap is connected inside the circuit breaker.
Should this not be carried out, the PXR trip unit will assume that the network
is 100 % balanced.
If this is not carried out, deviations due to star-point shifts will impair the
accuracy of the measurement function. The 3-pole PXR25 circuit breakers
are equipped with a pre-configured cable that can be used to tap the voltage
of the N conductor. No separate protection is required.
Figure 5: Connecting the N conductor on the NZM2 and NZM3
￫
The xSpider software is available on the Eaton website at:
www.xspider.eaton.eu
￫
Any adjustments to the protection functions should be carried
out in accordance with the recommendations of the technician
responsible for installing the circuit breakers.
L1 L2 L3
N
N
2
1