Generator Protection - ABB SACE Emax E1.2 Operating Instructions For The Design Engineer

3 - Generator protection

164 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
Description
Specific protections and functions have been integrated into SACE Emax 2 circuit-breakers equipped with
Ekip LCD or Touch trip units (with Ekip Measuring Pro module), or Ekip Hi- or G or G Hi- (LCD or Touch)
trip units to protect low voltage synchronous generators against typical fault conditions and to connect the
generators to the installation. This ensures solutions that are compact and simple to install, with no need to
turn to indirect solutions.
Available information
More information is available in the White Paper
for SACE Emax 2", which provides:
• A list of the available protections and functions giving both the ABB name and the ANSI codes (example:
protection RQ, with ANSI codes 40 and 32R).
• For each protection, the fault conditions to which it is applied (example: for protection RQ, the inversion
of the sign of the reactive power, positive if outgoing from the generator).
• A description of the malfunctions that can lead to the above fault conditions (example: for reactive power
reversal, the loss of excitation and the consequent loss of the electromotive force, with reactive power
absorption from the network by the generator).
• The types of generator or installation in which such mulfunctions are most likely to take place (for example:
reversal of reactive power, smooth rotor generators).
• The consequences to which they may lead if the trip unit does not trip (example: for reversal of reactive
power, a voltage drop, if the network is not able to supply the required reactive power with the consequent
loss of system stability, and in any case an increase in temperature on the generator windings).
• If the protection can be duplicated using the Hi- version of the trip unit, with the possibility of setting the
two protections independently, and therefore with the possibility of adding redundancy to increase reliability,
or to fine tune the adjustment of the protection.
• For each protection, the parameters to be set, the trip curves and the criteria for the setting of parameters.
• For each of the above parameters, the values that can be assigned.
• For each protection, an application example.
• The description of the synchronism function, which can be implemented with the Ekip Synchrocheck
module (see the chapter "4 - Ekip Synchrocheck module"), that permits the parallel connection of two
independent power supply systems.
For a summary of the fault conditions to which the protections are applied and of the parameters to be set,
see the chapters "9 - Touch protections" "10 - Measuring Pro protections" "12 - G Touch protections" and
"13 - G Hi-Touch protections".
Compatibility
The protections may already be available in Ekip LCD and Ekip Touch trip units (with Ekip Measuring Pro
module, see the chapter "3 - Ekip Measuring modules") or Ekip Hi- (LCD and Touch) trip units, or only Ekip
G or G Hi- trip units (LCD and Touch). To identify the trip units in which the protections are available, see the
chapter "1 - Presentation" and the paragraph "Families and functionality", and the chapter "6 - Menu" and
the paragraph "Advanced menus".
1SDC007409G0202 "Generator protections: Ekip G trip unit
Specific applications | 3 - Generator protection
ABB | SACE Emax 2