Page 140 - Sace Emax 2 Manual for design engineers

ABB | SACE Emax 2
2 - Generator protection

Description
Specific protections and functions have been integrated into SACE Emax 2 circuit-breakers equipped with
Ekip LCD or Touch trip units (with Measurement enabler with voltage socket 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 1SDC007409G0202 “Generator protections: Ekip G trip unit
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 “12 - Ekip Synchrocheck”), 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 chapter “Ekip Touch - Protections" starting on page 51.

Compatibility
To identify the trip units in which the protections are available, see the chapter “1 - Overview", and the chapter
"4 - Menu” and the paragraph “Advanced menus".

138 | © 2020 ABB | 1SDH001330R1002 - ECN000134959 - Rev. A Ekip Touch - Additional functions | 2 - Generator protection