The support grid is made of several Johnson screen sieve plates. Specification and size is customized. Material: 304, 321, 316 L, 904 L, duplex steel 2205, duplex steel 2207, Monel, Ti.etc.
Due to the good mechanical strength, it effectively prevents its own damage and tear in contact with the filler (quartz sand or porcelain ball, etc.) and catalyst ensuring the safe and smooth operation of the reactor in a long period. Therefore, it has gradually replaced the traditional stainless steel woven mesh and perforated plate tray, and has been widely used in petrochemical field.
Steel Screen,Ohnson Screen Support Grid,Stainless Steel Ohnson Screen Support Grid,Wedge Wire Support Screen Grid Xinxiang Shengda Filtration Technique Co., Ltd. , https://www.filtrations.nl
Overview With the rapid development of electric power technology, the power supply unit's requirements for electric power have also increased year by year, especially for on-line monitoring of high-voltage power cable sheath currents. However, due to the current use of solid insulated cables in power cables, electrical degradation, thermal degradation, chemical deterioration, mechanical deterioration, etc. may occur during long-term operation. At the same time, it may be subject to bite by rodents. The metal sheath is After being damaged, the earth circulation will rise to a dangerous numerical grounding system, causing the outer sheath breakdown or the sheath protector to be burned, which will lead to serious safety breakdowns such as main insulation breakdown of the cable. It can be seen that the use of existing scientific and technical means to conduct on-line monitoring of the sheath current will greatly reduce the on-site measurement of labor intensity and improve system maintenance efficiency.
Features 1. Real-time transmission of data to the monitoring center using 3G/GPRS/CDMA transmission mode, and the monitoring center displays a specific location on the electronic map;
2. It can effectively monitor the circulating current data of high-voltage grounding cables, and can independently set the warning value and alarm value, and can upload the high-voltage grounding cable circulation data in real time;
3, can effectively monitor the environment temperature and humidity, can set the ambient temperature and humidity limit alarm value, and can upload real-time environmental temperature and humidity data;
4, when the alarm occurs, 5 alarm short messages and 3 groups of voice calls can be sent;
5. Real-time on-line monitoring of high-voltage grounding cable temperature can be performed, and the over-limit alarm value can be set independently, and the temperature data of the grounding cable can be monitored in real time;
6, comes with zone alarm available, through mobile phones, telephones and other communications equipment to achieve remote monitoring and intercom function;
7, can use DC power supply;
8, can be set to regularly upload equipment operating status;
9, on-site alarm can be set to voice or silence;
10, comes with watchdog function, such as running an abnormal situation, with automatic restart function;
11, the use of industrial components, high temperature 85 °C, low temperature -40 °C
Technical parameters • Power supply: external DC12V or induction power source;
• Backup battery: high-performance lithium battery;
• Switch output: 2 way;
• Sirens sound level: not less than 110 decibels;
• Temperature detection: -40 °C ~ 85 °C;
• Communication: 3G/GPRS/CDMA;
• Operating temperature: -40 °C ~ 85 °C;
• The number of external inductive sensors: 4;
• Rated power: less than 1W;
• Lightning protection level: no less than 2 levels;
Static power current: less than 0.3W
• CT transformer: 0 ~ 100A (can be customized);
•CT transformer linearity error: 0.5%;
•CT transformer accuracy: 1%;
•CT transformer response time: less than 300mS.
Conclusion Application of circulation <br> <br> cable metal sheath line monitoring system, the ground loop substituted regular patrol over traditional manual mode, for determining the effective grounded tank being stolen or ground line had a great effect Daoge , It is an indispensable fault diagnosis equipment that can guarantee the safe and stable operation of cables. 
The principle of the cable metal sheath circulating current monitoring system is an intelligent early warning system developed by Shenzhen Trikang that can detect hidden safety hazards of buried cable lines in time. Real-time monitoring of the current parameters of the grounding point of each high-voltage cable metal sheath of 110kV and above high-voltage cables through the front-end current monitoring device, and using GPRS wireless communication to send the alarm information to the monitoring center, so that the monitoring center can locate the front-end monitoring points. The alarm information is sent to the relevant maintenance personnel so that the faulty cable can be replaced or repaired in time.