SERVICE MANUAL R5888C
QUADRAMHO Chapter 2
Page 2 of 74
Section 2. MAIN FEATURES
Full scheme 3 Zone distance relay with 18 measuring elements.
Characteristic shapes to suit all line lengths and fault levels.
Fast operating times over a very wide range of fault conditions.
Digital synchronous polarising for close-up 3 phase faults.
Microprocessor scheme logic with wide range of built-in schemes selected by code
selection switches.
Ample input/output facilities – 24 output contacts, 5 optically-coupled inputs, 10
light-emitting diodes.
Full range of test features for easy commissioning, routine testing and problem
analysis. Built-in interfacing enabling automatic field test equipment to be used if
required.
Continuous self-monitoring, on-demand and periodic self-test if required.
Built-in Voltage Transformer Supervision and Power Swing Blocking feature as
standard.
2.1 Quadramho models available
Two types of characteristic are available:
i) Zone 1 and 2: shaped partially cross polarised mho with
partially cross polarised directional line
Zone 3: offset lens (can be set as offset circular mho)
ii) Zone 1 and 2: ground faults quadrilateral with partially
cross polarised directional line
Zone 1 and 2 phase fault: shaped partially cross polarised mho with
partially cross polarised directional line
Zone 3 ground faults offset quadrilateral
Zone 3 phase faults offset circular mho
Each type includes Voltage Transformer Supervision and Power Swing Blocking
features as standard and is suitable for both three-pole and single-and three-pole
tripping.
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