Connection schemes Sepam 1000+ series 40 - Trinet

Protection functions
Description
Thermostat, Buchholz, gas, pressure, temperature detection
Protection of transformers against temperature rise and internal faults via logic inputs
linked to devices integrated in the equipment.
Temperature monitoring (RTDs) (ANSI 38/49T)
Protection against abnormal overheating of motor windings and/or bearings
equipped with RTDs.
The protection includes 2 independent set points that are adjustable for each RTD.
Positive sequence undervoltage (ANSI 27D) (ANSI 47)
Motor protection against malfunctioning due to insufficient or unbalanced supply
voltage.
Detection of reverse rotation direction.
In order for this protection to be used, voltage transformers must be connected to
Sepam 1000+ to measure U21 and U32.
Remanent undervoltage (ANSI 27R)
Monitoring of the clearing of voltage sustained by rotating machines after circuit
opening.
The protection is used to prevent transient electrical and mechanical phenomena
that are caused by fast re-energizing of motors.
It monitors phase-to-phase voltage U21 or phase-to-neutral voltage V1.
Voltage protection functions
Phase-to-phase undervoltage (ANSI 27)
Protection used either for automated functions (transfer, load shedding) or to protect
motors against undervoltage. The protection function monitors the drop in each of the
phase-to-phase voltages being metered.
Phase-to-neutral undervoltage (ANSI 27S)
Protection used to detect phase-to-earth faults (isolated neutral systems).
Phase-to-phase overvoltage (ANSI 59)
Protection against abnormally high voltage or checking that there is sufficient voltage
for power supply changeover. It operates with phase-to-phase voltage (series 20 and
series 40) or with phase-to-neutral voltage (series 40 only).
Neutral voltage displacement (ANSI 59N)
Detection of insulation faults in isolated neutral systems by measurement of neutral
voltage displacement. The protection function is generally associated with
transformer incomer or busbar protection.
The function includes 2 set points.
Negative sequence overvoltage (ANSI 47)
Protection against phase unbalance resulting from distant faults, a phase inversion
or unbalanced power supply.
Frequency protection functions
Overfrequency (ANSI 81H)
Protection against abnormally high frequency.
Underfrequency (ANSI 81L)
Detection of variances with respect to the rated frequency, in order to maintain a high
quality power supply. The protection may be used for overall tripping or for load
shedding.
Rate of change of frequency / R. O. C. O. F (ANSI 81R)
Protection used for fast disconnection of a source transmitting power into a power
network when a fault occurs or to monitor load shedding.
Recloser
Automation device used to reclose the circuit breaker after tripping triggered by a
transient fault on a line (the function includes 4 parameterizable reclosing cycles).
Schneider Electric
13