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The measurements are sent the module the protection release, enabling
the implementation set protection and measurement functions.1.
15.
The powering stage capable operating starting from voltage Vrms two-phase phase phase 897 Vrms 1.See par.1 PR120/V MEASURING Module
15.4)
- Isolator
Isolator
\
A
Before perform ing the dielectric stiffness test essential turn the isolator into the Test position ode turning
the screw anticlockw ise until you reach the end stroke position.1.1. the case three-phase systems with
a rated voltage greater than 690 Vrms phase phase, step-down transformer (with transformation ratio less than 1)is used.
1 eleases ith odule
- standard for PR123/P
- optional for PR122/P.2 Front view
- "Power Line" LED (lit when busbar voltage
is On, see 15.
At the end the procedure, make sure that the Power line LED on.
The following tables show the phase-to-phase voltage values the MEASURING module's input for which the relays and modulesare enabled
PR122/P and PR123/P Relay PR120/K odule
ENABLING THE UNIT AND ITS FUNCTIONS THREE-PHASE (phase-to-phase voltage)
PR122-PR123/P Relay PR120/K Relay display backlighting Enabling threshold
B
60 Vrms
B a
70 Vrms
B e
90 Vrms
Model L2234 Apparatus Scale
L2778
Doc No- 2
Page No.
15.Modules
15.1.7.1.1 General characteristics
The MEASURING module records and processes the phase voltages. The module also enables the relay powered.4 Powering the PR122/P and PR123/P units via the PR120/V odule
The PR122/P and PR123/P units are powered the MEASURING module via the busbar voltage.
Dielectric strength tests the secondary lines Voltage Transformers connected, any, are not allowed.3 690 Vrms three-
phase phase phase its input (coming directly from the busbars from transformer secondary).
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. The module comes with "Power" LED and sealable isolator for dielectric
stiffness tests.
A
A fter perform ing dielectric stiffness test, restore the isolator its original position turning clockw ise until you reach
the opposite end stroke, because all the voltage protections are disabled hile the isolator the test position.15
