127
Time delayed overvoltage protection (TOV)
Chapter 6
Voltage
2
Time delayed overvoltage protection (TOV)
2.1
Application
The time delayed phase overvoltage protection is used to protect the electrical equipment and its
insulation against overvoltage by measuring three phase voltages. In this way, it prevents the
damage to the exposed primary and secondary equipment in the power systems.
2.2
Functionality
The phase overvoltage protection function continuously measures the three phase voltages and
initiates the corresponding output signals if the measured phase voltages exceed the preset value
(starting) and remain high longer than the time delay setting on the timers (trip). This function
also detects the phases which caused the operation.
2.3
Function block
Figure 66:
TOV function block, phase and residual overvoltage
xx00000217.vsd
TOV--
TOV
BLOCK
BLKTR
TRIP
TRPE
TRN
STPE
STL1
STL2
STL3
STN
en02000667.vsd
TOV--
TOV
BLOCK
BLKTR
TRIP
TRPE
STPE
Summary of Contents for REL 501-C1 2.5
Page 1: ...Technical reference manual Line distance protection terminal REL 501 C1 2 5 ...
Page 2: ......
Page 26: ...14 Introduction to the technical reference manual Chapter 1 Introduction ...
Page 42: ...30 Technical data Chapter 2 General ...
Page 66: ...54 Blocking of signals during test BST Chapter 3 Common functions ...
Page 142: ...130 Time delayed overvoltage protection TOV Chapter 6 Voltage ...
Page 162: ...150 Autorecloser AR Chapter 9 Control ...
Page 174: ...162 Event function EV Chapter 10 Logic ...
Page 210: ...198 Serial communication Chapter 12 Data communication ...
Page 226: ...214 Serial communication modules SCM Chapter 13 Hardware modules ...
Page 230: ...218 Terminal diagrams Chapter 14 Diagrams Figure 87 REL 501 C1 with DC switch ...
Page 234: ...222 Terminal diagrams Chapter 14 Diagrams ...
Page 237: ......