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The power industry FTU power solution

Source Information:dfbd | Edit Author:dgfbf | Release Date:2014-10-17 | Viewed: |Share the:

Content in this paper:
RTU[1], in the electric power industry DTU[2], FTU[3], TTU[4] and other equipment is installed in the switch monitoring device of feeder switch near [5], automation engineering applied to the city, countryside, enterprise distribution network
1, application overview
RTU[1], in the electric power industry DTU[2], FTU[3], TTU[4] and other equipment is installed in the switch monitoring device of feeder switch near [5], automation engineering applied to the city, countryside, enterprise distribution network, ring network cabinet, complete monitoring and protection, communication and automation functions of column switch, with distribution station, master station to realize the distribution line normal monitoring and fault identification, isolation and non fault and restore the power supply, is widely used in power industry. Very similar to the internal design of these devices, the requirements for power supply is even more so, this paper takes FTU as an example to introduce the power supply solution.
2, FTU system structure and demand


From the above diagram, FTU acquisition three-phase current, voltage and the switch signal, and performing operation according to the analysis of data, the power supply requirements are as follows:
1), uses the double power source power supply to realize the system does not power, switching power supply and battery automatic switching;
2), the DC-DC can accept the voltage change caused by charging and discharging
3), the DC-DC is compatible with 24V and 48V two input battery
4), interference of high power isolation isolation AC side coupling strength
5), the main power supply and battery will power off, system power down to keep the time above 500mS
Recommendation 3, power solutions
In the face of the above demand in the global 20W 3000VAC pioneered Mornsun high isolation (URF_LP-20W Series) products, product features are as follows:
High efficiency
Working temperature: -40 degrees -85 degrees
18-75V input, compatible with 24V and 48V battery input
Isolation voltage 3000VAC, interference can charge the battery side introduction isolation
EMC meet IEC/EN61000 requirements, to meet CISPR22/EN55022 CLASS A bare metal
4, the recommended products
URF2405LP-20W
5, design reference
1), power delay: in the main power supply and battery power, system often take time to save data and therefore need to extend the power delay time, the common way is to increase the number of capacitor in the DC-DC input terminal (may be as high as thousands of uF), and when the input voltage is lower when power off delay time will greatly lower, at this time need to add larger capacitors at the input end.
2), higher EMC requirements: refer to the technical manual
6, the noun explanation
[1] RTU:Remoter terminal unit remote terminal unit
[2] FTU: Feeder terminal unit feeder automation control terminal,
[3] TTU:Distribution Transformer supervisory Terminal Unit distribution transformer monitoring terminal
[4] DTU:Data Transfer the full name of the unit data transmission unit.

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