8 Monitoring & Control
P50 Agile P253
8-14
P253/EN M/C
Figure 4: AND logic equation
AND Logic application example
The figure below is an example for AND logic implementation in the relay. There are two inputs to the
AND equations, one is SF6 Gas low signal which is externally wired to Opto I/P 1 of relay and other
input is TCS Alarm which is internally generated signal. Both signals are assigned to AND logic
equation and when both the input signals are high, then the output of AND logic equation will be high.
This output can be used to block all protection functions through external wiring.
Figure 5: AND logic equation application example
2.9
CB Monitoring
Periodic maintenance of circuit breakers is necessary to ensure that the trip circuit and mechanism
operate correctly and also that the breaking capability has not been compromised due to previous fault
interruptions. Generally, such maintenance is based on a fixed time interval. These methods of
monitoring circuit breaker condition give a rough guide only and can provide early indications of
maintenance required. The relays record various statistics related to each circuit breaker trip
operation, allowing a more accurate assessment of the circuit breaker condition.
Relay records following circuit breaker operation statistics:
Record in Measurement
Description
BOT
“Breaker Opening Time”- This is a circuit breaker opening time in ms.
BOC
“Breaker Operation Counter”- This counter indicates numbers of CB operations.
TC
“Trip Counter” -This counter indicates number of protection trips.
The above counters can be reset to zero, after maintenance inspection and overhaul.
2.9.1
CB Open Supervision
Slow CB operation indicates the need for mechanism maintenance. Alarm threshold (
CB Open Time
)
is provided to enforce this and can be set in the range of 50msec to 1 sec. This time relates to the
interrupting time of the circuit breaker and includes relay trip contact operating time, CB main contact
operation time and CB auxiliary contact operating time.
The relay starts internal timer as soon as any protection function is operated. Relay monitors the CB
open contact status and stops the timer as soon as the CB open feedback is received by the relay. If
this measured time is more than setting “
CB Open Time
”, then relay generates
CB Open
Supervision
alarm. An alarm message is displayed on LCD display and the START LED starts
blinking. The associated event is stored in Event Record. In the event the measured Breaker opening
time is less than the setting “
CB Open Time
”, the timer is reset and no alarm is generated.
Summary of Contents for P50 Agile P253
Page 3: ...P50 Agile P253 1 Introduction P253 EN M C 1 1 INTRODUCTION CHAPTER 1 ...
Page 4: ...1 Introduction P50 Agile P253 1 2 P253 EN M C ...
Page 11: ...SAFETY INFORMATION CHAPTER 2 ...
Page 12: ...Safety Information Pxxx 2 ...
Page 23: ...P50 Agile P253 3 Hardware Design P253 EN M C 3 1 HARDWARE DESIGN CHAPTER 3 ...
Page 24: ...3 Hardware Design P50 Agile P253253 3 2 P253 EN M C ...
Page 28: ...3 Hardware Design P50 Agile P253253 3 6 P253 EN M C E00276 Figure 2 Hardware design overview ...
Page 32: ...3 Hardware Design P50 Agile P253253 3 10 P253 EN M C ...
Page 33: ...P50 Agile P253 4 Front Panel P253 EN M C 4 1 FRONT PANEL CHAPTER 4 ...
Page 34: ...4 Front Panel P50 Agile P253 4 2 P253 EN M C ...
Page 39: ...P50 Agile P253 4 Front Panel P253 EN M C 4 7 Figure 2 USB port ...
Page 40: ...4 Front Panel P50 Agile P253 4 8 P253 EN M C ...
Page 41: ...P50 Agile P253 5 Configuration P253 EN M C 5 1 CONFIGURATION CHAPTER 5 ...
Page 42: ...5 Configuration P50 Agile P253 5 2 P253 EN M C ...
Page 154: ...5 Configuration P50 Agile P253 5 114 P253 EN M C ...
Page 155: ...P50 Agile P253 6 Protection Functions P253 EN M C 6 1 PROTECTION FUNCTIONS CHAPTER 6 ...
Page 156: ...6 Protection Functions P50 Agile P253 6 2 P253 EN M C ...
Page 182: ...7 Protection Parameter Settings P50 Agile P253 7 2 P253 EN M C ...
Page 203: ...P50 Agile P253 8 Monitoring Control P253 EN M C 8 1 MONITORING CONTROL CHAPTER 8 ...
Page 204: ...8 Monitoring Control P50 Agile P253 8 2 P253 EN M C ...
Page 222: ...8 Monitoring Control P50 Agile P253 8 20 P253 EN M C ...
Page 223: ...P50 Agile P253 9 SCADA Communications P253 EN M C 9 1 SCADA COMMUNICATIONS CHAPTER 9 ...
Page 224: ...9 SCADA Communications P50 Agile P253 9 2 P253 EN M C ...
Page 249: ...P50 Agile P253 10 Installation P253 EN M C 10 1 INSTALLATION CHAPTER 10 ...
Page 250: ...10 Installation P50 Agile P253 10 2 P253 EN M C ...
Page 260: ...11 Commissioning Instructions P50 Agile P253 11 2 P253 EN M C ...
Page 270: ...11 Commissioning Instructions P50 Agile P253 11 12 P253 EN M C ...
Page 272: ...12 Maintenance and Troubleshooting P50 Agile P253 12 2 P253 EN M C ...
Page 282: ...13 Technical Specifications P50 Agile P253 13 2 P253 EN M C ...
Page 292: ...13 Technical Specifications P50 Agile P253 13 12 P253 EN M C ...
Page 293: ...P50 Agile P253 14 Wiring Diagrams P253 EN M C 14 1 WIRING DIAGRAMS CHAPTER 14 ...
Page 294: ...14 Wiring Diagrams P50 Agile P253 14 2 P253 EN M C ...
Page 297: ......