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6.1 LPS-O FUNCTIONAL TESTS
a) DRAWINGS
The following drawings should be used for reference during testing:
Elementary Diagrams
•
Figure 1–11: ELEMENTARY DIAGRAM on page 1–25
Logic Diagrams
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Figure 1–1: PTFF LOGIC DIAGRAM on page 1–8
•
Figure 1–2: LINE PICKUP LOGIC DIAGRAM on page 1–9
•
Figure 1–3: REMOTE-OPEN DETECTOR LOGIC on page 1–10
•
Figure 1–4: OSB LOGIC DIAGRAM on page 1–10
•
Figure 1–8: STEP DISTANCE LOGIC DIAGRAM on page 1–21
51G curves
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Figure 2–14: INVERSE CURVE on page 2–29
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Figure 2–15: VERY INVERSE CURVE on page 2–30
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Figure 2–16: EXTREMELY INVERSE CURVE on page 2–31
b) REFERENCE
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Chapter 11: LPSO-LINK USER GUIDE
•
Chapter 12: ASCII COMMUNICATIONS
6
Tests are performed in test mode, which allows viewing of the internal measuring units and functions. The
measuring units and functions are actually internal to the software. There are no individual hardware modules
that are responsible for the specific measuring functions.
The test mode selects and isolates various test functions and measuring units, then routes their status to the
A1 (A9–A25) contact. When the particular function under test has picked up, the A1 contact closes. Target
information is displayed for tests that cause tripping.
Testing can be performed with outputs disabled. The A1 contact still closes whenever a trip condition exists,
however the tripping contacts do not operate. Disabling outputs can be accomplished when test mode is
entered.
CAUTION : The A1 contact will chatter when the unit under test is near its threshold. Do not
let it continue to chatter! Remove the test current. A single contact closure is enough to
determine that the unit picked up.
Use a continuity tester with high-input impedance, such as a digital ohmmeter, to monitor the A1 contact during
relay testing.
NOTE: Where appropriate, current levels are defined with two numbers as xx ( yy ); xx is the value to be
used for relays rated at 5 Amperes and ( yy ) is the value to be used for 1 Ampere rated relays.
NOTE: Tripping contacts will operate while the LPS-O is in test mode unless the outputs were disabled
by the user.
6-
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6 FUNCTIONAL TESTS (USER SETTINGS)
LPS-O Line Protection System
6.1.2 DRAWINGS AND REFERENCES
6.1.3 GENERAL INSTRUCTIONS
GE Power Management
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