General; Characteristics - Siemens 7sg15 microtapp Operation Manual

1. General

These are preliminary performance specification.

2. Characteristics

2.1 Energising Quantities
Single-phase current (any phase) and 3-phase voltages will be measured at 50 or 60Hz.
Measured Quantity
V AC Voltage
n
I AC Current
n
From these quantities the following will be calculated with the specified accuracies.
Calculated Value
RMS Voltage
RMS Current
System Frequency
System Power Factor
2.2 Measuring Circuit Burden
1A current input
5A current input
110V voltage input
2.3 Basic Voltage Control
V
t
B
w
t
i
The relay will use phase A-B r.m.s. voltage for its basic bandwidth calculations.
2.4 Load Drop Compensation
The value is entered as a percent increase in busbar voltage required at the firm capacity of the substation (taking
into account all transformers).
Bs
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Nominal Values
1A or 5A RMS
1VA
1VA
0.1VA
Target level
Bandwidth
Initial Delay
Bias Level
(at firm capacity)
7SG15 MicroTAPP Performance Specification
110V RMS
Accuracy
±0.25% @ 80% x Vn
±5% @ 20% x In
±0.125Hz between 47Hz and 63Hz
±0.5°
85% to 115% step 0.1%
0 to ±5% step 0.1%
DTL: 2s to 180s step 1s
IDMTL: time setting, target voltage and
deadband to be defined
0 to 20% step 0.1%
Measured Range
227% x V
n
285% x I
n
<0.5Ω
<0.5Ω
>1MΩ
Chapter 2 Page 3 of 8