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Emax
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Model
Scale
Page No.
Doc. No.
Apparatus
1SDH000460R0002
L2778
15 Modules
15.1 PR120/V - MEASURING Module
15.1.1 General characteristics
The MEASURING module records and processes the phase voltages. The measurements are sent by the module to the protection release, enabling
the implementation of a set of protection and measurement functions. The module comes with a "Power" LED and a sealable isolator for dielectric
stiffness tests. The module also enables the relay to be powered.
15.1.2 Front view
- "Power Line" LED (lit when busbar voltage
is On, see 15.1.4)
- Isolator
Before performing the dielectric stiffness test it is essential to turn the isolator into the Test position mode by turning
the screw anticlockwise until you reach the end of stroke position.
After performing a dielectric stiffness test, restore the isolator to its original position by turning it clockwise until you reach
the opposite end of stroke, because all the voltage protections are disabled while the isolator is in the test position.
Dielectric strength tests on the secondary lines of Voltage Transformers connected, if any, are not allowed.
At the end of the procedure, make sure that the Power line LED is on.
15.1.3
Releases complete with the module
- standard for PR123/P
- optional for PR122/P.
15.1.4 Powering the PR122/P and PR123/P units via the PR120/V module
The PR122/P and PR123/P units are powered by the MEASURING module via the busbar voltage.
The powering stage is capable of operating starting from a voltage of 80 Vrms two-phase phase to phase up to 897 Vrms ( 1.3 * 690 Vrms ) three-
phase phase to phase at its input (coming directly from the busbars or from a transformer secondary). In the case of three-phase systems with
a rated voltage greater than 690 Vrms phase to phase, a step-down transformer (with a transformation ratio of less than 1) is used. See par. 15.1.7.
The following tables show the phase-to-phase voltage values at the MEASURING module's input for which the relays and modules are enabled:
PR122/P and PR123/P Relay + PR120/K Module
ENABLING THE UNIT AND ITS FUNCTIONS
THREE-PHASE (phase-to-phase voltage)
PR122-PR123/P Relay
PR120/K
Relay display backlighting
Enabling threshold
60 Vrms
70 Vrms
90 Vrms
Isolator
