Micro hydro
Posted: Sun Apr 04, 2021 9:20 pm
Hi everyone
I am wondering whether anyone has inspected a grid tied micro hydro system before? Specifically a powerspout. I have visited a site that contains 3 × PLT 200 (200V dc) 1kw Paralled up, located in a shed.. They are connected to a grid tied inverter located 100m away. The cable for the DC is 25mm2 N/S, Negative being the screen. This is an unusual design for my likening, the only reason the electrician designed this this way is that the inverter has wifi limitations that wouldnt reach the shed. If the turbines freewheel for whatever reason (assume grid failure?) Voltage could reach up to 600v. The neutral screen is rated 600/1000v, but would the electrician need to get the specs from the manufacturer to state that it is suitable for 600vdc? I know for Pv systems a cable needs to be marked with pvf-1 (5033) but there is nothing specific for hydro. I assumed that the dc cable would need to be flex however reading of 4777:1 2016 which is a little more in depth that 2005, it states that this requirement is only required for wind or vibrations.
The electrician has also driven an earth electrode at the shed for the earthing of the turbines, however stated in ASNZS3000 section 7?, earthing needs to run to the earth bar of the main switchboard.
Thoughts?Opinions?
The installation is quite agricultural, including using 32amp hrc fuse holders to disconnect the DC. But before i proceed any further I would like to know others opinions on the design.
Thanks for your time
I am wondering whether anyone has inspected a grid tied micro hydro system before? Specifically a powerspout. I have visited a site that contains 3 × PLT 200 (200V dc) 1kw Paralled up, located in a shed.. They are connected to a grid tied inverter located 100m away. The cable for the DC is 25mm2 N/S, Negative being the screen. This is an unusual design for my likening, the only reason the electrician designed this this way is that the inverter has wifi limitations that wouldnt reach the shed. If the turbines freewheel for whatever reason (assume grid failure?) Voltage could reach up to 600v. The neutral screen is rated 600/1000v, but would the electrician need to get the specs from the manufacturer to state that it is suitable for 600vdc? I know for Pv systems a cable needs to be marked with pvf-1 (5033) but there is nothing specific for hydro. I assumed that the dc cable would need to be flex however reading of 4777:1 2016 which is a little more in depth that 2005, it states that this requirement is only required for wind or vibrations.
The electrician has also driven an earth electrode at the shed for the earthing of the turbines, however stated in ASNZS3000 section 7?, earthing needs to run to the earth bar of the main switchboard.
Thoughts?Opinions?
The installation is quite agricultural, including using 32amp hrc fuse holders to disconnect the DC. But before i proceed any further I would like to know others opinions on the design.
Thanks for your time