Schweitzer Engineering Laboratories SEL-311L Instruction Manual page 521

Column
Heading
59 S
59 V1 Q
59 N
25 59 V
25 SF
25 A
27B
81 1 2
81 3 4
Date Code 20010625
Corresponding
Elements (Relay
Word Bits) Symbol
59S
59V1, 59Q
59N1, 59N2
59VP, 59VS
SF
25A1, 25A2
27B81
81D1, 81D2
81D3, 81D4
Standard Event Reports and SER
SEL-311L Instruction Manual
Definition
* VS instantaneous overvoltage element
59S picked up.
1 Positive-sequence instantaneous
overvoltage element 59V1 picked up.
Q Negative-sequence instantaneous
overvoltage element 59Q picked up.
b Both 59V1 and 59Q picked up.
1 First ground instantaneous
overvoltage element 59N1 picked up.
2 Second ground instantaneous
overvoltage element 59N2 picked up.
b Both 59N1 and 59N2 picked up.
P Phase voltage window element 59VP
picked up (used in synchronism
check).
S Channel VS voltage window element
59VS picked up (used in synchronism
check).
b Both 59VP and 59VS picked up.
* Slip frequency element SF picked up
(used in synchronism check).
1 First synchronism check element
25A1 picked up.
2 Second synchronism check element
25A2 picked up.
b Both 25A1 and 25A2 picked up.
Undervoltage element for frequency
*
element blocking (any phase)
asserted.
1 Level 1 instantaneous frequency
element asserted.
2 Level 2 instantaneous frequency
element asserted.
b Level 1 and 2 instantaneous
frequency elements asserted.
3 Level 3 instantaneous frequency
element asserted.
4 Level 4 instantaneous frequency
element asserted.
b Level 3 and 4 instantaneous
frequency elements asserted.
12-17