1.3 Characteristics
30
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
Motor Starting Pro-
tection 48
• Inverse time tripping characteristic based on an evaluation of the motor starting cur-
rent;
• Definite time delay for blocked rotor.
Motor Start Inhibit
66, 86
• Approximate replica of excessive rotor temperature;
• Startup is permitted only if the rotor has sufficient thermal reserves for a complete
startup;
• Disabling of the start inhibit is possible if an emergency startup is required.
Frequency Protec-
tion 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;
• Adjustable undervoltage threshold.
Thermal Overload
Protection 49
• Thermal profile of energy losses (overload protection has total memory capability);
• True r.m.s. calculation;
• Adjustable thermal alarm level;
• Adjustable alarm level based on current magnitude;
• Additional time constant setting for motors to accommodate the motor at standstill;
• Integration of ambient temperature or coolant temperature is possible via external
temperature sensors and RTD-Box.
Monitoring Func-
tions
• Availability of the device is greatly increased because of self-monitoring of the inter-
nal measurement circuits, power supply, hardware, and software;
• Current transformer and voltage transformer secondary circuits are monitored
using summation and symmetry check techniques
• Trip circuit monitoring;
• Phase rotation check.
Ground Fault De-
tection 50N(s),
51N(s), 67N(s),
59N/64
• Displacement voltage is measured or calculated from the three phase voltages;
• Determination of a faulty phase on ungrounded or grounded networks;
• Two-element Ground Fault Detection: 50Ns-1 and 50Ns-2;
• High sensitivity (as low as 1 mA);
• Overcurrent element with definite time or inverse time delay;
• One user-defined and two logarithmic-inverse current/time curves are available for
inverse time O/C protection;
• Direction determination with zero-sequence quantities (I
0
, V
0
), wattmetric ground
fault direction determination;
• Any element can be set as directional or non-directional — forward sensing direc-
tional, or reverse sensing directional;
• Directional characteristic can be adjustable;
• Optionally applicable as additional ground fault protection.
Содержание siprotec SJ62
Страница 3: ...3 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 9: ...Preface 9 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 21: ...Contents 19 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 35: ...1 Introduction 33 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 365: ...2 Functions 363 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 443: ...3 Mounting and Commissioning 441 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 529: ...4 Technical Data 527 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 699: ...A Appendix 697 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 701: ...Literature 699 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 714: ...Index 712 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 715: ...Index 713 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...