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4.1 OVERVIEW
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Figure 1–6: REMOTE-OPEN DETECTOR LOGIC (ROD) on page 1–14
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Figure 1–8: OSB LOGIC DIAGRAMS on page 1–15
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Figure 1–10: STEP DISTANCE LOGIC DIAGRAM on page 1–24
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Figure 1–12: PUTT LOGIC DIAGRAM on page 1–26
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Figure 1–13: PERMISSIVE OVERREACH TRANSFER TRIP (POTT1) on page 1–28
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Figure 1–14: POTT WITH BLOCKING FUNCTIONS (POTT2) on page 1–29
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Figure 1–15: BLOCKING SCHEME LOGIC DIAGRAM on page 1–31
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Figure 1–18: HYBRID LOGIC DIAGRAM on page 1–34
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Figure 1–24: OUT-OF-STEP TRIPPING LOGIC on page 1–42
51G curves:
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Figure 2–18: INVERSE CURVE on page 2–48
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Figure 2–19: VERY INVERSE CURVE on page 2–49
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Figure 2–20: EXTREMELY INVERSE CURVE on page 2–50
The following Chapters should also be used for reference:
4
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Chapter 11: ALPS-LINK USER GUIDE
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Chapter 12: ASCII COMMUNICATIONS
All equipment used in testing the relay should be connected to a common grounding point to provide noise immunity. This
includes the voltage and current sources and the ALPS itself.
The ground connection on the ALPS is terminal A2. The common for surge protection is terminal A18.
A2 should be connected to A18 with #12 wire or larger during test as well as operation (The separate surge
ground is for Hi-Pot testing purposes).
NOTE
Most tests use the default settings. Any required setting changes are listed with the test procedure.
For details on performing the relay test with user-specific settings during periodic testing; see Chapter 6: FUNCTIONAL
TESTS (USER SETTINGS).
1.
Tests are performed using the relay's 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 relaying functions and measuring units, then routes their status to the A1
(programmable alarm 1) 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 from the ACTIONS menu or at the start of
Relay Test mode.
Contact A1 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.
CAUTION
4-2
ALPS Advanced Line Protection System
4 ACCEPTANCE/PERIODIC TESTS
4.1.4 EQUIPMENT GROUNDING
4.1.5 REQUIRED SETTINGS
4.1.6 GENERAL INSTRUCTIONS
GE Power Management
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