High Voltage DC GFCI
High Voltage DC GFCI
(OP)
Hi,
I'm wondering on how I can make or buy a Direct Current GFCI for +/- 300Vdc. Attached is a picture of my power source, the 'ground' is tied to chassis and any loads are connected between the +/- 300V lines so will see 600Vdc.
I'm wondering if for a GFCI, would i be monitoring for any current on the ground, and if any amount is detected, to open some contactors or shut off the source. Or should I clamp one of those round DC current transducers ( http: //www.a-a- c.com/2dcc urrentxduc r/2%20DC%2 0Current%2 0Xducr.htm )on both the + and - 300V lines, and I'm thinking it should output 0, because both lines current readings are cancelling out each other, and if it was to detect a difference, that is a ground fault? I've looked for some DC GFCIs and came up with nothing, saw some at BENDER but they werent high enough voltage rated.
And also if someone can help direct me to a GFCI spec or requirement for that DC voltage, like it should trip if 5mA difference is detected for a certain amount of time?
Thanks alot.
I'm wondering on how I can make or buy a Direct Current GFCI for +/- 300Vdc. Attached is a picture of my power source, the 'ground' is tied to chassis and any loads are connected between the +/- 300V lines so will see 600Vdc.
I'm wondering if for a GFCI, would i be monitoring for any current on the ground, and if any amount is detected, to open some contactors or shut off the source. Or should I clamp one of those round DC current transducers ( http:
And also if someone can help direct me to a GFCI spec or requirement for that DC voltage, like it should trip if 5mA difference is detected for a certain amount of time?
Thanks alot.





RE: High Voltage DC GFCI
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: High Voltage DC GFCI
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: High Voltage DC GFCI
Alternatively, Areva's MR627 earth fault relay can operate on up to 1500V DC - search Areva T&D's website.
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If we learn from our mistakes I'm getting a great education!
RE: High Voltage DC GFCI
Now I'm sort of having trouble finding out what is the standard tripping current and time for this sort of GFCI. Since this is for a vehicle, reading from SAE J2344 - Guidelines for EV safety, in section 3.7 it says the resistance between the battery high voltage and the vehicle conductive structure should be greater or equal to 500 ohms/V, which is defined as "isolated". So would that sort of be saying any more than 2mA flowing through the chassis be cause for a trip? And how long?