Which manufacturer’s power transmitters are better?
Thread Content
Our company uses a large number of three-wire three-phase active power transmitters, and these start to develop problems after just a few months of use. Which manufacturers do others use for such devices that offer good quality at a price of less than 1500 yuan?
We are using a real power isolation converter (three-phase four-wire) model STW-41A1 for measuring generator power; its price is over 8,000, and I’m not sure if that’s too expensive.
Domestically, Haian Pubo is of good quality; abroad, the AMETEK voltage transmitters from the United States are the best. However, for new projects these days, digital communication-based multi-parameter measuring instruments are being used – one instrument can measure multiple electrical parameters, eliminating the need to use multiple voltage transmitters as in the past to obtain all the necessary data. Moreover, multiple instruments can be connected using just one 485 port on the DCS, which saves a lot of 4–20MA interfaces. The project price has dropped, and the features have been enhanced! You can consult Shenzhen CEC. This post was last edited by liuei on 2009-2-14 18:19]
We measure motor power; yours is too expensive, haha
It seems to be a large motor; if communication is possible with the DCS, then a motor protector that combines protection functions with communication capabilities can be used. This post was last edited by liuei on 2009-2-14 at 12:37
The motor protection and monitoring device offers communication interfaces such as RS-485 and PROFIBUS_DP. It uses the MODBUS and PROFIBUS protocols; through these interfaces, parameters such as three-phase voltage, three-phase current, three-phase power, total active power, total reactive power, and power factor, as well as digital status information, device operation data, SOE event details, and protection logic settings, can be uploaded to the DCS for centralized monitoring and management. It features comprehensive digital motor protection and monitoring functions, including short circuit, locked-rotor, time-limited overload, inverse-time overload, ground fault, current imbalance, phase loss, under-voltage, over-voltage, tE time, excessive starting time, interlock tripping, restart, as well as 64 event records with timestamps, all of which meet the requirements of industrial production process control.