1. Overview

 

In Hepu County, Beihai City, Guangxi, a flagship project embodying the region's aluminum industry upgrade vision is taking shape—the Dongfang Hope Beihai Aluminum Oxide Project. As the cornerstone of Beihai's aluminum circular economy, its Phase I will produce 4.8 million tons of alumina annually, creating a trillion-yuan industrial cluster through upstream-downstream integration.

 

With an estimated annual output value of 70 billion yuan, this initiative vividly exemplifies Guangxi's aluminum strategy of' internal production and external distribution. 'The project's stable operation hinges on a secure power system, where Acrel's integrated solution—featuring intelligent control, wireless temperature monitoring, and partial discharge detection—has established a comprehensive, smart safety barrier for the 10KV substation.

 

 

 

2. Product requirements, configuration options, and product introduction

 

Product requirements

 

 The Dongfang Hope Beihai alumina project requires intelligent control systems, wireless temperature sensors, and partial discharge monitoring equipment. These systems will monitor the internal environment of switchgear cabinets in the 10KV substation, track switch status, measure temperature at electrical contacts, and detect partial discharges within the cabinets.

 

The project requires 10KV switchgear equipped with intelligent control devices that enable real-time monitoring of electrical parameters and operational physical quantities. Key features include dynamic simulation display of switch status, live high-voltage display with interlock, voltage verification and phase checking functions, wireless temperature measurement, partial discharge monitoring, environmental temperature / humidity tracking, and comprehensive voltage / current / power parameter display.

 

The system must also incorporate forced heating, forced lighting, human body detection, voice alarm prompts, as well as integrated remote/local switches, disconnectors, and energy storage switches.

 

 

Detailed requirements for partial discharge in switchgear include:

1. Power supply: DC 12-36V;

2. Measurement parameters: ultrasonic (AE), terrestrial electromagnetic wave (TEV), ultra-high frequency (UHF), noise, temperature, and humidity;

3. Ultrasonic (AE): Measurement range: 0dBμV to 60dBμV; Resonant frequency: 40kHz ±1kHz;

4. Terrestrial electromagnetic wave (TEV): Measurement range: 0dBmV to 60dBmV; Bandwidth: 3MHz to 100MHz;

5. Ultra-high frequency (UHF): Measurement range: -70dBm to 10dBm; Frequency band: 300MHz to 1500MHz; Equivalent height: ≥10mm;

6. Ambient noise: 30dB to 130dB;

7. Ambient temperature: -40℃ to 85℃;

8. Ambient humidity: 0% to 100% RH;

9. Communication protocol: MODBUS-RTU;

10. Installation method: Magnetic adsorption.

 

 

Detailed requirements for wireless temperature measurement include:

1. Power supply: CT induction power supply with current ≥5A;

2. Sampling frequency: 15S;

3. Wireless frequency: 470MHz;

4. Communication range: 150m (open area);

5. Temperature measurement range: -50 to 125℃;

6. Temperature accuracy: ±1℃;

7. Installation method: Alloy sheet fixation.

 

 

 

 

Configuration

 

This project focuses on configuring intelligent control systems and partial discharge monitoring devices for 10KV high-voltage cabinets. The ASD500 intelligent control device is installed on the cabinet doors of the instrument room, with one unit per cabinet. The APD300-L partial discharge monitoring device is mounted on the cabinet walls of the cable room, with one unit per cabinet. Additionally, each cabinet is equipped with a 9-point wireless temperature sensor.

 

The following images show partial switchgear drawings for substations.

 

Product presentation

 

The Dongfang Hope Beihai alumina project utilizes three intelligent control systems: the ASD500 intelligent control device, the APD300-L partial discharge monitoring device for switchgear, and the ATE400 wireless temperature sensor. This section provides a detailed product overview of these three systems.

 

 

 

Intelligent control ASD500

 

The ASD500 switchgear integrated measurement and control device is designed for 3~35kV indoor switchgear, compatible with various types including medium-mounted cabinets, cart-type cabinets, fixed cabinets, and loop network cabinets. It features a primary circuit simulation diagram with switch status indicators, high-voltage live display and phase verification, automatic temperature and humidity control, heating circuit fault alarms, open/closed circuit integrity indicators, open/closed circuit voltage measurements, flash indicators for pre-open/closed operations, wireless temperature monitoring at electrical nodes, automatic lighting with human body detection, voice prompts, electrical parameter measurements, partial discharge monitoring, and RS485/Ethernet communication interfaces. This integrated solution combines operation and display functions into a single unit.

 

1) Temperature and humidity display interface: The system employs digital temperature and humidity control. When the relative humidity reaches or exceeds 85%, heating is activated; when it drops below 77%, heating is deactivated. The fan is activated when the ambient temperature reaches or exceeds 40°C, and stops when it falls below 35°C. For temperature control, heating is initiated when the ambient temperature is below 5°C and deactivated when it reaches or exceeds 13°C. The ASD500 measures and displays real-time temperature and humidity on an LCD screen, featuring control contacts for heating and ventilation. Users can customize upper and lower limits for heating, dehumidification, and ventilation as needed.

 

 

 

2) Wireless temperature measurement display interface: The device transmits temperature values directly through wireless temperature receivers and individual wireless temperature sensors, displaying the measured temperatures via LCD. When the temperature exceeds the preset high-temperature threshold for wireless measurement, an alarm record is generated to indicate a node high-temperature alert.

 

 

 

3) Partial Discharge Display Interface: The APD300-L magnetic adsorption partial discharge device is installed inside the switchgear cabinet. It connects to the second RS485 port of ASD500 via RS485 (back terminals 85 and 86). The monitoring system displays the discharge amplitude, mean value, and frequency of ultrasonic (AE), terrestrial electromagnetic wave (TEV), and ultra-high frequency (UHF) signals, along with environmental parameters including noise, humidity, and temperature. The AE alarm flag is set to 1 when: AE amplitude exceeds the AE alarm threshold with over 25 AE discharge events; TEV alarm flag is activated when: TEV amplitude surpasses the TEV alarm threshold with over 25 TEV discharge events; UHF alarm flag is triggered when: UHF amplitude exceeds the UHF alarm threshold with over 25 UHF discharge events.

 

400无源无线温度传感器 400 Passive wireless temperature sensor	无线频率 Wireless frequency	470MHz、433Mhz
	通讯距离 Communication distance	空旷150m（470Mhz）、空旷50m（433Mhz） 150m(470Mhz) 、50m(433Mhz)in open area
	采样频率 Sampling frequency	15s
	发射频率 Transmission frequency	15s
	工作电源 Power source	CT感应取电，启动电流≥5A CT-powered, starting current≥5A 最大工作电流(Max current)≤5000A
	安装方式 Installation	合金片固定 alloy chip fixing
	传感器探头 Sensor probe	合金底座 alloy bottom
	测温范围 Range of temperature	-50℃~125℃
	精度 Precision	±1℃
	应用范围 Application	高低压柜内电气接头 Joints in high or low voltage switchgears