Neutral Line Overcurrent Protection Device
NTPS integrates neutral overcurrent protection and neutral current elimination.
As a revolutionary electrical system product, it is developed based on years of research and industry expertise.
By eliminating neutral current and protecting the neutral conductor, NTPS enhances power supply continuity and slows cable aging.
It delivers an all-round solution for high and low-order harmonics, three-phase imbalance, and neutral overcurrent.
It also serves as a robust protection solution for precision equipment.
As an industry-leading product, NTPS effectively addresses neutral protection challenges in TN-S and TN-C systems.
Neutral Line Overcurrent Protection Device Description
Terminal Electrical Comprehensive Management and Protection System: N-line Treatment Protection System, abbreviated as NTPS; is an electrical product that detects and analyzes the current of end circuits, manages harmonics and three-phase imbalance in accordance with the principles of power supply continuity and safety, protects precision equipment, eliminates neutral line current, prevents electrical fires caused by line issues, and provides overcurrent quick-break protection as well as fixed duration and inverse time-limit protection for neutral line overcurrent conditions.
Data Sheet
| Electrical parameters | |
| Wiring method | Three-phase four-wire |
| Operating voltage | 380V/220V±20% |
| Operating frequency | 50/60Hz, ±10% |
| Product specifications | Models 90, 153, 225, 320, 450 |
| Current transformer specifications | 50:5 ~ 20000:5, 50:1~20000:1 |
| Noise | ＜60dB |
| Technical features | |
| Switching devices | SiC Mosfet |
| Switching frequency | >100kHz |
| Heat dissipation methods | Intelligent air cooling |
| Heat dissipation control | Adaptive fan speed adjustment |
| Protection function | Output overcurrent protection, output current limiting protection, over-temperature protection, DC bus overvoltage protection, AC input undervoltage protection, AC input overvoltage protection, control system fault protection, main circuit component damage and disconnection protection; overcurrent instantaneous trip protection for neutral wire, definite time and inverse time protection; |
| Compensation performance | |
| Harmonic filtering range | Low order: 2~63 times High order: 2kHz~20MHz |
| Three-phase imbalance control | Unbalance degree＜5% |
| Neutral current control | ＞90% |
| Overall efficiency | ≥99% |
| Active power loss | ＜1% |
| Full response time | ＜5ms |
| Display Interface | |
| Display screen | APP/Remote Control |
| Language | Chinese, English, and customizable languages |
| Battery display | Distortion rate, power factor, power, voltage, current, neutral current, and other data display |
| Communication interface and protocol type | RS485, TCP/IP, Modbus protocol, 4G remote transmission |
| Environmental conditions | |
| Operating temperature | -25℃~+50℃ |
| Relative humidity | <95%, no condensation |
| Altitude | <5000 meters (above 1000 meters, capacity decreases by 1% for every additional 100 meters) |
| Others | |
| Protection level | IP20 rating, other ratings available upon customization. |
| Installation method | Wall-mounted installation. |
Q&A
Excessive neutral wire current leads to aging of the neutral wire, posing a fire risk. This is mainly caused by the fundamental current generated by three-phase imbalance and harmonic currents from nonlinear loads. Current flowing through a conductor generates heat, which is proportional to the square of the current (12R). When the current reaches 1.5 times the phase current, the heat generated in the neutral wire can reach 2.25 times that of the phase wire! Furthermore, in typical power distribution systems (TN-C, TN-S), although there are overcurrent protection devices on the phase wires, there are none on the neutral wire. Excessive current will inevitably accelerate the aging of the neutral wire insulation, posing a safety hazard.
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