[Tổng hợp] Comparison of Powder Fire Extinguisher and CO2 Gas Fire Extinguisher
26-08-2024
30-08-2024
Training document
Currently, some large-capacity transformers use oil circuits to lubricate the transformer equipment. When operating, the temperature of this oil circuit can reach ~ 55 °C, causing the oil to change state. Therefore, during the transformer testing process, lowering and maintaining a stable oil temperature is necessary. Understanding this problem, CNV Group would like to introduce a sample of a water-cooled transformer testing cooling system to readers.
SYSTEM REQUIREMENTS:
To achieve the above requirements, contractor CNV Group provides the following solutions:
1. System schematic diagram:
2. Working principle
2.1. Phần hệ thống làm mát
– The system is mounted on two steel frames for easy mobility, storage, and transportation when not in use. One steel frame structure – without wheels – is used to place the chiller and valve system, the remaining steel frame contains the pump system and intermediate water tank. The division into two steel frame structures optimizes the frame size (smallest possible size). When needed, these two steel frames are craned and transported to a location outside the inspection room, and connected to the transformers with insulated flexible pipes.
– The system is divided into 2 basic cooling water circuits:
– The Chiller will operate based on the signal of the temperature sensor located at the bottom of the tank and the flow meter at the inlet of the chiller. The chiller will operate when the temperature in the bottom of the tank is greater than 20°C (>20°C) and the flow switch detects water entering the chiller. The chiller will turn off when the water temperature in the bottom of the tank drops below 20°C (20°C).
2.2. Phần hệ thống điện điều khiển và giám sát hệ thống
2.2.1.Control system part
The control system includes 01 electrical cabinet to supply power and control the system. On the cabinet body, there is 01 HMI screen to monitor the working status of the equipment, allowing setting of temperature and input flow of the transformer…
The control system is divided into 2 parts (Primary – Secondary):
– Primary: to maintain the temperature in the water tank at 20 degrees Celsius.
– Secondary: Purpose to ensure circuit output water requirements (MBA input) according to setup.
2.2.2. Phần hệ thống giám sát, xuất dữ liệu:
– The local monitoring system is monitored via the HMI screen on the electrical cabinet surface.
– Remote monitoring system via installed Camera records the indicators on the HMI screen.
– Data extraction via Module, data can be saved for about 1 week with a frequency of 15-30 minutes per data storage
The temperature and water output speed adjustment in the circuit is performed on the HMI screen on the control cabinet surface.
HVAC Team – Project Division of CNV Group