R&D and Manufacturing

Key Intellectual Property

See the original certificates under Certifications ›

Designed for Reliability

• Electromagnetic compatibility

  Eight immunity and emission tests to the GB/T 14598 (IEC 60255) series, including electrostatic discharge, surge, electrical fast transient/burst, radiated and conducted RF, and power-frequency tests; key items meet Level III or Class A.

• Wide operating temperature

  Operating temperature −40 °C to +70 °C, suited to renewable plants in extreme cold, extreme heat and large day–night temperature swings.

• Interface protection

  Digital inputs use opto-isolation and surge-absorption circuits with insulation withstand of at least 1500 V AC; output relay contacts are rated for more than 100,000 operations.

• Communication redundancy

  Dual optical ports form a self-healing fiber ring with ST connectors reaching up to 50 km; a single fiber break does not affect communication with the other units.

Manufacturing and Quality

• In-house board design

  Core boards — CPU board, analog input board, digital input/output board, power and communication board, fiber board, switch module board and display board — are designed in-house by AOYI.

• In-house manufacturing

  Our own production facility at Yinhe Port, No. 9 Jinghai 6th Road, Beijing Economic-Technological Development Area, has passed the PCCC initial factory inspection and is subject to post-certification surveillance.

• Unit-by-unit testing

  Every unit undergoes communication-port, function and accuracy tests, a 48-hour burn-in (including 75 °C high-temperature aging and timed power cycling) and a second round of testing before it ships. See the factory testing process below.

• Model and version control

  Every board type is tracked by model and version number (e.g. 6000-CPU-4211-3); complete units are configured and assembled to the project drawings and commissioned before shipment.

• Long-term spare parts

  Spare parts remain available for all three generations — NSA6000, NSA2 and NSA3 — so plants in service for many years can still replace boards with the original model.

• After-sales response

  2-hour response, on site within 48 hours, with service centers in Beijing and Xi'an. See Service & Support.

Factory Testing, Unit by Unit

Every unit is tested — 100% inspection, no sampling — and passes the following five steps before shipment.

1. 1Assembly and firmware loadingThe enclosure is assembled and the measurement & control, gateway and switch-module firmware is loaded; settings are downloaded and the CPU board clock is synchronized.
2. 2Communication port testingEach RS485 port is tested with every protocol in turn; Ethernet ports undergo extended ping tests; optical ports are tested by linking two units; the gateway configuration is downloaded once all tests pass.
3. 3Function and accuracy testingStatus change and reset, keypad and display, output relays and remote control are tested item by item; PT100 and 4–20 mA inputs are verified with standard resistors and a calibrator; current and voltage are calibrated with a relay-protection test set, and overcurrent settings are changed to verify protection operation; event records are uploaded and checked.
4. 448-hour burn-inUnits run continuously for 48 hours, including about 9 hours on each of two days in a 75 °C aging chamber, with timed power cycling (40 minutes on, 20 minutes off every hour) to prove reliability under repeated power-up.
5. 5Re-testingAfter burn-in, the communication-port and function tests are repeated; units ship only when every test is passed.

Certifications

Type test

The NSA3 Smart Station Monitoring Unit was type-tested by the National Quality Inspection and Testing Center for Power Transmission and Distribution Safety Control Equipment (State Grid Electric Power Research Institute), report No. GJB23040115, May 2023, to DL/T 478-2013 (General specification for relay protection and security automatic equipment) and GB/T 7261-2016 (Basic testing method for relay protection and security automatic equipment). All function, performance and EMC items passed. The laboratory is CMA and CNAS accredited.

PCCC product certification

The NSA3 box transformer measurement, control and protection unit (Smart Station Monitoring Unit) is certified by Power (Beijing) Certification Centre to DL/T 478-2013 (General specification for relay protection and security automatic equipment) and GB/T 7261-2016 (Basic testing method for relay protection and security automatic equipment). Certification scheme: type test + initial factory inspection + post-certification surveillance. Certificate No. 26P12108001R0S, valid to February 2031.

ISO 9001 quality management system

Compliant with GB/T 19001-2016 / ISO 9001:2015, covering the design, R&D and sales of box transformer monitoring and protection units. Registration No. 101326Q00018R001, valid to January 2029.

Product carbon footprint

Verified to ISO 14067:2018 and PAS 2050:2011 (cradle-to-gate, 2025 data): 0.05 tCO₂eq per unit for NSA2 and NSA3, 0.068 tCO₂eq per unit for NSA6000. Certificate No. LSDT-BG-202604081547.

National High-Tech Enterprise

Certificate No. GR202311002677, granted in October 2023 by the Beijing Municipal Science & Technology Commission, Beijing Municipal Finance Bureau and Beijing Municipal Tax Service of the State Taxation Administration.

CE marking

Products carry CE marking.

See the original certificates under Certifications.