NSA-series Smart Station Monitoring Units
Box-type transformer measurement, control and protection for solar and wind plants. All options are configurable per project; final configuration follows the project drawings.
Product range
NSA3
Measurement & protection + communication gateway + fiber-ring switch, plus cable grounding-current and cable-joint temperature monitoring.
NSA2
Measurement & protection + communication gateway for inverters, combiner boxes and meters + fiber-ring switch.
NSA6000
Box transformer measurement, control and protection with LED display and optional fiber, Ethernet or RS-485 uplink.
NSA3 — with cable health monitoring
- Box transformer telemetry, status, remote control, protection and event recording (10 waveforms, 500 SOE).
- Communication gateway: up to 8 RS-485 master ports and 4 Ethernet ports for inverters, combiner boxes, meters and cameras.
- Two fiber ports form a self-healing ring; ST connectors, up to 50 km.
- Cable sheath grounding-current monitoring with trend analysis and alarms.
- Wireless (433 MHz) cable-joint temperature sensing with configurable thresholds.
- PCCC product certification to DL/T 478-2013 and GB/T 7261-2016.
NSA2 — multi-device communication management
- Continuous monitoring of the box transformer with telemetry, status, remote control, protection and recording.
- Up to 8 RS-485 master ports and 4 Ethernet ports to integrate inverters, combiner boxes, meters and environmental monitors.
- Self-healing fiber ring with two ST fiber ports; optional Wi-Fi access point.
NSA6000 — compact and rugged
- High-performance EMC design for harsh field conditions; LED display of transformer voltages and currents.
- Overcurrent stages I/II/III, ground fault, overvoltage, undervoltage and non-electrical protections; 500 fault records.
- Uplink by fiber, Ethernet or RS-485 to suit each site; HMI (RS-485) service port.
Configuration overview
| Item | NSA3 | NSA2 | NSA6000 |
|---|---|---|---|
| AC input groups (3-phase V/I) | 3 | 3 | 2 |
| DC inputs (PT100 / 4–20 mA) | 6 total | 6 total | 6 total |
| Grounding-current input | 1 | — | — |
| Digital inputs | 40 | 40 | 40 |
| Digital (relay) outputs | 10 | 10 | 10 |
| Fiber ports | 2 | 2 | Optional |
| Ethernet ports | 4 | 4 | |
| RS-485 master ports | 8 | 8 | |
| 433 MHz wireless receiver | Yes | — | — |
| Protection | Electrical and non-electrical | ||
| Records | 500 | ||
Maximum configurations; all items are optional and follow the project drawings.
Technical specifications (all models)
- Current input
- 5 A or 1 A; accuracy class 0.5
- Voltage input
- AC 690 V / 400 V / 100 V; accuracy class 0.5
- Frequency
- 50 Hz or 60 Hz; ±0.02 Hz
- Power / power factor
- ±1%
- Digital inputs
- AC/DC 220 V, opto-isolated with surge absorption, insulation ≥ AC 1500 V
- Relay outputs
- AC 220 V 8 A; AC 380 V 1.9 A; DC 250 V 1.5 A; > 100,000 operations
- Communication
- Fiber (ST, up to 50 km), 10/100Base-TX Ethernet, RS-485
- Protocols
- MODBUS-RTU, IEC 60870-5-103/104, IEC 61850
- Power supply
- AC/DC 220 V ±20%, 50 Hz (−6%…+2%), ≤ 10 W
- Operating temperature
- −40 °C to +70 °C
- Humidity / pressure
- Max. 90% monthly average RH, non-condensing; 80–110 kPa
- EMC
- GB/T 14598 (IEC 60255-22/-25) series: ESD, oscillatory wave, radiated RF, EFT/burst, surge, conducted RF, power-frequency immunity; conducted and radiated emissions
- Mounting
- Panel (flush) mounting; NSA3 depth 235 mm, NSA2 225 mm, plus ≥ 80 mm for rear wiring
Documentation and support
MODBUS register maps and configuration software are available in Chinese on our download page. IEC 104 / IEC 61850 point lists and model files are available on request — email sales@aoyipower.com.
Warranty: 12 months from energization or 18 months from shipment, whichever comes first. Response within 2 hours and on site within 48 hours where required. Spare parts remain available for all three product generations.