Schweitzer Engineering SEL-351P, Быстрый старт

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Date Code 990430 Setting the SEL-351P Recloser Control 9-43
SEL - 351P Manual Técnico
S
ETTINGS
E
XPLANATIONS
Note that most of the settings in the settings sheets that follow include references for additional
information. The following explanations are for settings that do not have reference information
anywhere else in the instruction manual.
Identifier Labels
Refer to Settings Sheet 1 of 23.
The SEL-351P has two identifier labels: the Relay Identifier (RID) and the Terminal Identifier
(TID). The Relay Identifier typically is used to identify the recloser control or the type of
protection scheme. Typical Terminal Identifiers include an abbreviation of the substation name
and line terminal.
The SEL-351P tags each report (event report, meter report, etc.) with the Relay Identifier and
Terminal Identifier. This allows you to distinguish the report as one generated for a specific
breaker and substation.
RID and TID settings may include the following characters: 0 - 9, A - Z, -, /, ., space. These two
settings cannot be made via the front-panel interface.
Current Transformer Ratios
Refer to Settings Sheet 1 of 23.
Phase and neutral current transformer ratios are set independently. The IN channel is wired up as
a sensitive residual current channel in the SEL-351P. The neutral current transformer ratio will
be set equal to the phase current transformer ratio. The neutral current channel is scaled to
measure sensitive residual currents (less than 1.5 A secondary). The internally derived residual
elements (G elements) are scaled the same as the phase channels and measure larger currents.
Line Settings
Refer to Settings Sheet 1 of 23.
Line impedance settings Z1MAG, Z1ANG, Z0MAG, and Z0ANG are used in the fault locator
(see
Fault Location in Section 12: Standard Event Reports and SER ) and in automatically
making directional element settings Z2F, Z2R, Z0F, and Z0R (see Settings Made Automatically
in Section 4: Loss-of-Potential, Load Encroachment, and Directional Element Logic ). A
corresponding line length setting (LL) is also used in the fault locator.
The line impedance settings Z1MAG, Z1ANG, Z0MAG, and Z0ANG are set in
Ω
secondary.
Line impedance (
Ω
primary) is converted to
Ω
secondary:
Ω
primary
•
(CTR/PTR) =
Ω
secondary
where:
CTR = phase (IA, IB, IC) current transformer ratio
PTR = phase (VA, VB, VC) potential transformer ratio