Signal Perfection Perspectives
In modern utility monitoring and automated protection relay cubicles, electromagnetic noise coupling onto current transformer (CT) secondary wire arrays severely degrades measuring precision. This can trigger catastrophic false trips on circuit breakers. To counter this operational hazard, this low-pass 6A three-phase filtering junction block consolidates channels A-N, B-N, and C-N into a single shielded module. It provides clean analog signals to digital microprocessors and eliminates the space and labor of discrete secondary wiring rails.
Unique Engineering Parameters
Ultra-Low Distortion Circuit Core: The internal LC filtration components are calculated to add negligible input impedance, protecting standard CT burden limits. It maintains an ultra-precise phase shift of ≤1° and a total composite ratio error below 0.5%, in compliance with rigid IEC 61869-2 utility parameters.
Polymer Polycarbonate Isolation Base: Moving away from traditional brittle plastics that snap under thermal stress, the body structure is injected with high-molecular polymer polycarbonate. This provides immense anti-shattering shock resistance, zero ambient water absorption to block mildew, and a UL94 V-0 fire-retardant rating.
Vibration-Immune Combo Screw Tunnels: Terminal blocks utilize an advanced composite combination slot screw layout. Field teams can land secondary wires from 0.5mm² to 4mm² using either straight flathead or cross screwdrivers, creating low-resistance contact paths that resist machine-floor micro-vibrations.
Broadband Conducted Noise Ingress Guard: Delivers a stable, verified insertion loss of ≥30dB stretching from 50Hz up to 1MHz. This performance stops conducted high-frequency EMI generated by nearby variable frequency drives (VFDs) and carrier radios from corrupting sensitive counter cards.
Technical Parameters
| Parameter | Value |
| Rated Current | 6 A continuous (suitable for 1 A / 5 A CT secondary) |
| Rated Voltage | 660 V AC (insulation) |
| Number of Channels | 3 (A‑N, B‑N, C‑N) |
| Filter Topology | Low‑pass LC (optimized for CT signal bandwidth) |
| Insertion Loss (typical) | ≥30 dB (50 Hz – 1 MHz) |
| Phase Shift @ 50 Hz | ≤1° |
| Composite Error | ≤0.5 % |
| Wire Range (copper) | 0.5 mm² – 4 mm² |
| Terminal Type | Tubular screw (torque ≥0.5 N·m) |
| Housing Material | PC |
| Operating Temperature | -25 °C – +85 °C |
| Storage Temperature | -40 °C – +105 °C |
| Mounting | Panel mount (screw) or optional DIN‑rail adapter |
| Certifications | CE, RoHS, IEC 61869‑2 (accuracy) |
Strategic Deployment Venues
Optimized for multi-tenant smart-grid metering arrays, power station protection racks, and industrial switchgear networks. It shrinks standard panel asset space requirements by 50%, simplifying cluster troubleshooting via pre-marked connection markers on the main chassis.
International Validation Marks
Manufactured in complete alignment with strict global quality guidelines, this unit holds formal China Compulsory Certification (CCC), CE markings, and RoHS safety traceability. It ensures reliable long-term service without requiring auxiliary external control voltage lines.
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