9190700990 Rev F
BE1-67N General Information
1-1
SECTION 1
•
GENERAL INFORMATION
PURPOSE
BE1-67N Ground Directional Overcurrent Relays provide ground fault protection for transmission and
distribution lines by sensing the flow of ground (zero sequence) current into or out of protected zones.
Zero sequence quantities provide a secure reference for the directional element because these quantities
are defined by the total source impedance of the power system.
APPLICATION
BE1-67N Ground Directional Overcurrent Relays are recommended for multi-grounded systems to
provide coordination necessary to selectively trip the faulted line. A directional overcurrent relay operates
by comparing the measured current to a reference quantity to determine whether current is flowing into or
out of the protected zone. Reference quantity is also referred to as polarizing quantity.
BE1-67N relays use one of the following quantities for polarization:
•
Zero
sequence
current
•
Zero
sequence
voltage
•
Dual zero sequence current and voltage
The polarizing quantity is field selectable using a switch mounted on the analog circuit board. When the
selected polarizing quantities are less than the minimum threshold, relay operation will be inhibited. When
using dual polarization, the relay will operate if either polarizing quantity is above minimum threshold.
Zero Sequence Current
Zero sequence current polarization is preferred for applications with low ground source impedance.
Figure 1-1 illustrates relay connections that obtain zero sequence current (3
I
0
) from a separate current
transformer in the grounded neutral of a two winding wye-delta power transformer. Figure 1-2 illustrates
relay connections that obtain zero sequence current from a current transformer(s) in the grounded
neutral(s) of a three winding transformer. The magnitude of the zero sequence current used for polarizing
may be different from that of the ground current seen by the measuring element(s) of the relay.
Figure 1-1. Zero Sequence Polarizing (Two-Winding Transformer)
Содержание BE1-67N
Страница 2: ......
Страница 6: ...iv BE1 67N Introduction 9190700990 Rev F This page intentionally left blank...
Страница 8: ...vi BE1 67N Introduction 9190700990 Rev F This page intentionally left blank...
Страница 10: ...ii BE1 67N General Information 9190700990 Rev F This page intentionally left blank...
Страница 18: ...1 8 BE1 67N General Information 9190700990 Rev F This page intentionally left blank...
Страница 20: ...ii BE1 67N Controls and Indicators 9190700990 Rev F This page intentionally left blank...
Страница 26: ...ii BE1 67N Functional Description 9190700990 Rev F This page intentionally left blank...
Страница 34: ...ii BE1 67N Installation 9190700990 Rev F This page intentionally left blank...
Страница 36: ...4 2 BE1 67N Installation 9190700990 Rev F Figure 4 1 Panel Cutting and Drilling Diagram Semi Flush Mounting...
Страница 37: ...9190700990 Rev F BE1 67N Installation 4 3 Figure 4 2 Panel Drilling Diagram Projection Mounting...
Страница 38: ...4 4 BE1 67N Installation 9190700990 Rev F P0002 14 08 10 01 Figure 4 3 Cover Dimensions Front View...
Страница 39: ...9190700990 Rev F BE1 67N Installation 4 5 Figure 4 4 Case Dimensions Rear View...
Страница 43: ...9190700990 Rev F BE1 67N Installation 4 9 Figure 4 7 Typical Internal Connections...
Страница 46: ...4 12 BE1 67N Installation 9190700990 Rev F This page intentionally left blank...
Страница 48: ...ii BE1 67N Testing 9190700990 Rev F This page intentionally left blank...
Страница 58: ...ii BE1 67N Characteristic Curves 9190700990 Rev F This page intentionally left blank...
Страница 60: ...A 2 BE1 67N Characteristic Curves 9190700990 Rev F Figure A 1 Timing Type B1 Short Inverse Switch Position 3...
Страница 61: ...9190700990 Rev F BE1 67N Characteristic Curves A 3 Figure A 2 Timing Type B2 Long Inverse Switch Position 1...
Страница 62: ...A 4 BE1 67N Characteristic Curves 9190700990 Rev F Figure A 3 Timing Type B3 Definite Time Switch Position 5...
Страница 63: ...9190700990 Rev F BE1 67N Characteristic Curves A 5 Figure A 4 Timing Type B4 Moderate Inverse Switch Position 2...
Страница 64: ...A 6 BE1 67N Characteristic Curves 9190700990 Rev F Figure A 5 Timing Type B5 Inverse Switch Position 4...
Страница 65: ...9190700990 Rev F BE1 67N Characteristic Curves A 7 Figure A 6 Timing Type B6 Very Inverse Switch Position 6...
Страница 68: ...A 10 BE1 67N Characteristic Curves 9190700990 Rev F Figure A 9 Timing Type E4 BS 132 Inverse Switch Position 9...
Страница 69: ...9190700990 Rev F BE1 67N Characteristic Curves A 11 Figure A 10 Timing Type E5 BS 142 Inverse Switch Position A...
Страница 72: ...A 14 BE1 67N Characteristic Curves 9190700990 Rev F This page intentionally left blank...
Страница 74: ...B 2 BE1 67N Polar Graph Forms 9190700990 Rev F This page intentionally left blank...
