Secure HT Energy Meter

The Secure LT CT (Low Tension, Current Transformer-operated) Energy Meter—notably the Secure Premier 300—is a sophisticated three-phase, four-wire digital meter engineered for accurate revenue-grade measurement in industrial, commercial, utility, and transformer applications. It is widely adopted for transformer metering, boundary, and bulk power monitoring in Indian distribution networks.

Key Features and Technical Specifications 

• Type: LT CT-operated (requires external 5A/10A CTs)

• Wiring Configuration: 3-phase, 4-wire; also supports 3-phase, 3-wire with CT/VT options

• Voltage Range (LT use): 230/240 V (Phase-Neutral)

• Current Range: -/5(10) A (standard secondary current input)

• Accuracy: Class 0.5s for LT; higher precision Class 0.2s available in some models

• Frequency: 50 Hz ±5%

• Display: Large, backlit LCD, annunciators for event/status, scroll lock for continuous display

• Metering Capability: True four-quadrant bidirectional metering (import/export), kWh/kVAh/kVARh, maximum demand registration

• Load Survey: Stores up to 90 days of 30-min interval profile for 8 parameters

• TOU Tariffs: Up to 8 rate registers, configurable by time-of-day

• Advanced Event Logging: Detects voltage, current, magnetic influences, and tampering attempts

• Remote Communication: DLMS/COSEM protocol via optical port, plus RS-232/RS-485 (RJ-11) for local/remote reading

• Meter Reading on Mains Absence: Internal battery enables display without mains

• Sealing & Enclosure: Engineering plastic, IP51 rating, provision for main and terminal cover sealing

• Compliance: Meets IS 14697, IEC 62052-22, IEC 62053-24, IS 15959 standards

• Dimensions/Weight: 191 x 255 x 82 mm, ~1.2 kg

• Operational Environment: -10°C to +55°C, up to 95% RH non-condensing

Typical applications include transformer, substation, and bulk consumer metering, with use by major Indian utilities for revenue assurance, load analysis, and billing.