SIPROTEC 4 7SA522 Distance Protection Relay for Transmission ...
SIPROTEC 4 7SA522 Distance Protection Relay for Transmission ...
SIPROTEC 4 7SA522 Distance Protection Relay for Transmission ...
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<strong>SIPROTEC</strong> 4 – <strong>7SA522</strong><br />
<strong>Distance</strong> <strong>Protection</strong> <strong>Relay</strong> <strong>for</strong> <strong>Transmission</strong> Lines<br />
Technical Function Data<br />
Pilot-(Tele-) protection <strong>for</strong> directional ground-(earth-) fault overcurrent protection – ANSI 85-67N<br />
Operating modes<br />
Transient blocking logic<br />
Send and receive signals<br />
directional comparison Pickup<br />
directional comparison Blocking<br />
directional comparison Unblocking<br />
<strong>for</strong> schemes with parallel lines<br />
suitable <strong>for</strong> 2- and 3- terminal lines<br />
Weak Infeed protection with undervoltage – ANSI 27WI<br />
Operating modes with carrier (signal) reception echo<br />
echo and trip with undervoltage<br />
Undervoltage phase-ground (-earth) 2V to 70V (step 1V)<br />
Time delay<br />
0.00s to 30s (step 0.01s)<br />
Echo impulse<br />
0.00s to 30s (step 0.01s)<br />
Tolerances<br />
Voltage threshold ≤ 5% of set value or 0.5V<br />
Timer<br />
± 1% of set value or 10ms<br />
Backup overcurrent protection – ANSI 50(N), 51(N)<br />
Operating modes<br />
Characteristic<br />
Instantaneous trip after switch-onto-fault<br />
active only with loss of VT secondary circuit<br />
always active<br />
2 definite time stages / 1 inverse time stage<br />
selectable <strong>for</strong> every stage<br />
Definite time overcurrent Pickup definite time stage 1, phase current 0.1A to 25A (1A) / 0.5A to 125A (5A)<br />
protection<br />
(step 0.01A)<br />
ANSI 50, 50N Pickup definite time stage 1, neutral (residual) 0.05A to 25A (1A)<br />
/ 0.25A to 125A (5A)<br />
current<br />
(step 0.01A)<br />
Pickup definite time stage 2, phase current<br />
0.1A to 25A (1A) / 0.5A to 125A (5A)<br />
(step 0.01A)<br />
Pickup definite time stage 2, neutral (residual)<br />
0.05A to 25A (1A) / 0.25A to 125A (5A)<br />
current<br />
(step 0.01A)<br />
Time delay <strong>for</strong> definite time stages<br />
0.00 to 30s (step 0.01s) or deactivated<br />
Tolerances<br />
Current starting<br />
≤ 3% of set value or 1% of I nom<br />
Delay times<br />
± 1% of set value or 10ms<br />
Operating time<br />
approx. 25ms<br />
Inverse time overcurrent Phase current starting 0.1A to 4A (1A) / 0.5A to 20A (5A)<br />
protection<br />
(step 0.01A)<br />
ANSI 51, 51N Neutral (residual) current starting 0.05A to 4A (1A) / 0.5A to 20A (5A)<br />
(step 0.01A)<br />
Tripping time characteristics Characteristics normal inverse<br />
according to IEC 60255-3<br />
very inverse<br />
extremely inverse<br />
long time inverse<br />
Time multiplier<br />
T p = 0.05 to 3s (step 0.01s) or deactivated<br />
Pickup threshold<br />
approx. 1.1 x I/I p<br />
Reset threshold<br />
approx. 1.05 x I/I p<br />
Tolerances<br />
Operating time <strong>for</strong> 2 ≤ I/I p ≤20<br />
≤ 5% of setpoint ±15ms<br />
28 Siemens SIP 4.2 · 08/99
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