Siemens SIPROTEC 7UM62 User Manual

Introduction
1.3 Characteristics
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
30
Frequency Protection 81 O/U
• Monitoring on undershooting (f<) and/or overshooting (f>) with 4 frequency limits and delay times that are
independently adjustable.
• Insensitive to harmonics and abrupt phase angle changes.
• Settable undervoltage threshold.
Overexcitation Protection
• Calculation of the U/f ratio
• Adjustable warning and tripping stage.
• Standard characteristic or arbitrary trip characteristic selectable for calculation of the thermal stress.
Frequency Change Protection
• Monitors whether the frequency overshoots (df/dt>) and/or undershoots (df/dt<) a set limit value, with 4 in-
dividually settable limit values or delay times.
• Variable measuring windows
• Coupling to frequency protection pickup.
• Settable undervoltage threshold.
Vector Jump
• Sensitive phase jump detection to be used for network disconnection.
90 % Stator Earth Fault Protection
• Suitable for generators in unit connection and directly connected to busbars.
• Measurement of displacement voltage via the neutral or earthing transformer or by calculation from phase-
to-earth voltages.
• Sensitive earth current detection, optionally with or without directional determination with zero sequence
components (I
0
, U
0
).
• Directional characteristic adjustable.
• Determination of the earth-faulted phase.
Sensitive Earth Fault Protection
• Two-stage earth fault current measurement: I
EE
>> and I
EE
>.
• High sensitivity (adjustable on the secondary side from 2 mA).
• Can be used for stator earth fault or rotor earth fault detection.
• Measurement circuit monitoring for minimum current flow when used for rotor earth fault protection.
100 % Stator Earth Fault Protection with 3rd Harmonic
• Detection of the 3rd harmonic of the voltage at the starpoint or open delta winding of an earthing transformer.
• Combined with the 90 % stator earth fault protection there is a protection of the entire stator winding (pro-
tective range 100 %).

Siemens SIPROTEC 7UM62 Specifications

General

Brand	Siemens
Model	SIPROTEC 7UM62
Category	Protection Device
Language	English