ABB SPAM 150 C, Техническая информация

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2
1MRS 751841-MTI EN
Issued 2000-06-22
Modified 2003-04-01
Version B (replaces 350 SPAM 04 EN1)
Checked HS
Approved MÖ
Data subject to change without notice
Application examples for
the relay SPAM 150 C
Contents
Introduction ................................................................................................................... 2
General about the protective functions ........................................................................... 3
Some notes and useful hints............................................................................................ 4
Connection with two phase current transformers ...................................................... 4
Stabilizing for virtual earth-fault currents .................................................................. 4
Problems with false E/F or U/B trips during start-up ................................................ 4
Increasing the sensitivity of the earth-fault protection ............................................... 4
Optimizing the needed time left to restart ................................................................. 4
Time constant versus safe stall time t
6x
...................................................................... 4
External trip via control input ................................................................................... 5
Disabling of restart inhibit for use outside SPAM 150 C ........................................... 5
Mutual restart inhibit for multimotor applications .................................................... 5
Note about the contactor versus circuit-breaker drives ............................................... 5
Example 1. Protecting a circuit breaker controlled motor in an isolated network. ........... 6
Example 2. Determining suitable setting values for a standard,
contactor controlled direct started motor ..................................................... 9
Example 3. Protecting a direct started motor with a low safe stall time ......................... 11
Example 4. Protecting of a feeder cable, a transformer or another non-rotating object .... 12
The parameter p of the thermal unit........................................................................ 13
Example 5. How to use the start-up time counter ........................................................ 15
Example 6. How to set the phase unbalance and phase reversal unit ............................. 16
Appendixies .................................................................................................................. 17
Introduction
The motor protection relay SPAM 150 C is a
versatile multifunction relay, mainly designed
for protection of standard a.c. motors in a wide
range of motor applications. Due to the large
number of protective functions integrated, the
relay provides a complete protection against
motor damage caused by electrical faults. The relay can also be applied on other objects
calling for a thermal overload protection such
as feeder cables and power transformers.