Siemens siprotec 7SA6 User Manual

Functions
6-1037SA6 Manual
C53000-G1176-C133-1
current transformers connected in a star arrangement must be available and
connected.
Definite Time Very
High Set Current
Stage 3I
0
>>>
The earth current I
E
= 3I
0
is passed through a numerical filter and then compared with
the set value ,!!!. If this value is exceeded and alarm is issued. After the
corresponding delay times 7,!!! have expired, a trip command is issued which
is also alarmed. The reset threshold is approximately 5 % + 0,5 mA below the pick-up
threshold.
The possibilities of selection are referred to in the heading “General”. Figure 6-61
shows the logic diagram of the 3I
0
>>>–stage. The function modules “direction
determination”, “permissive teleprotection”, “switch onto fault”, and “inrush
stabilization” are common to all stages and described below. They may however affect
each stage individually. This is done with the following parameters:
• 2SPRGH,!!!, determines the operating direction of the stage: )RUZDUG,
5HYHUVH or 1RQ'LUHFWLR QDO,
• ,!!!7HOHS%,, determines whether a non-delayed trip with the teleprotection
scheme is possible (<HV) or not possible (1R),
• ,!!!627)7ULS, determines whether during energization of the feeder onto a
fault tripping with this stage shall be non-delayed (<HV) or not (1R) and
• ,!!!,QUXVK%ON, which is used to switch the inrush stabilization (rush blocking)
on (<HV) or off (1R).
Figure 6-61 Logic diagram of the 3I
0
>>>–stage
Definite Time High
Set Current
Stage 3I
0
>>
The logic of the high set current stage 3I
0
>> is the same as that of the 3I
0
>>>–stage.
3I0>>> is therefore to be replaced by ,!!, then, Figure 6-61 also applies for 3I
0
>>.
I
E
3I
0
>>>
Yes
No
Reverse
Forward
Non-Direct.
„1“
≥1
&
&
inrush-
stabilization
direction-
determination
forwards
reverse
&
&
Yes
No
,!!!627)7ULS

Yes
No
permissive
teleprot..
switch onto
fault
≥1
EF 3I0>>> TRIP
T0
 7627)7LPH '(/$<

T0
&
&
PICKUP
PICKUP+DIRECT.

&
627)2S0RGH
1305 >EF BLK 3I0>>>

1354
EF 3I0>>>Pickup
1366
,!!!,QUXVK%ON


,!!!7HOHS%,
≥1
>EF Inst TRIP
,!!!

7,!!!
2SPRGH,!!!
Inactive
FNo1310

Siemens siprotec 7SA6 Specifications

General

Brand	Siemens
Model	siprotec 7SA6
Category	Relays
Language	English