DEMA CPM 310 G User Manual page 75

Digital overcurrent protection relay
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%(I
/I
)> Broken Conductor Protection Menu
2
1
Main Screen » Set » %(I
Protection
Can be set as "Active" or "Passive", to have the protection into or out of service.
%(I
/I
)> (Threshold)
2
1
Indicates the threshold value for the protection function. The set value range is %(20-100).
t%(I
/I
)> (Tripping Delay)
2
1
Describes the trip delay time once the %(I
protection is DMT and can set within the range of (1 – 14,400) s. □
Broken Conductor Protection is symbolized as
%(I
/I
2
describes the positive sequence current and I
describes the negative sequence current.
%(I
/I
2
circuit in cases where one or two primary phase
conductors are broken (I = 0 A) but there is no fault
current, or one or two secondary wirings are open
circuit.
The picture shows the Broken Conductor Protection
Menu and the menu comprises 3 parameters.
/I
)>
2
1
/I
) threshold is broken. Delay type for broken conductor
2
1
- 75 -
)> or I
/I
> in the IEC Standards, where I
1
2
1
)> protection is utilized to intervene the primary
1
1
2

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