Acronyms and Terminology

Short terms	Expansion	Description
TSE	Transfer Switching Equipment	Self-acting transfer switching equipment, including all necessary sensing inputs, monitoring, and control logic for transferring operations.
ATSE	Automatic Transfer Switching Equipment
RTSE	Remote Transfer Switching Equipment	Remote operated transfer switching equipment
MTSE	Manual Transfer Switching Equipment	Manually operated transfer switching equipment
SI	Source I	SI supply
SII	Source II	SII supply
N	Normal	Normal supply
A	Alternate	Alternate supply
E	Emergency
O	Off position	Two powers are disconnected
Specific TSE	Specific transfer switching equipment	2/3 position dedicated designed as IEC 60947-6-1 product requirement
Derived TSE	Derived transfer switching equipment	Fulfilling requirements of other IEC 60947 product standards
Open transition	Normal transfer	The basic transfer function
In phase transition	Sync transition	Open transition but detect phase angle when re-transfer
Delayed transition	Delay transition	A programmable time delay for neutral position
Close transition	Close transition	A load transfer by momentarily paralleling both sources
Neutral overlapping	Transfer with neutral overlapping	Making before breaking and N will never be lost
Under voltage sensor		Detect the Undervoltage of power source
Over voltage sensor		Detect the Overvoltage of power source
Frequency sensor		Detect the frequency of power source
Voltage imbalance sensor		Detect the balance of power source
Phase rotation sensor		Detect the phase angle of power source
Loss of single-phase sensor		Detect the phase of power source
T2	Transfer Delay	Transfer delay
T4	Center-off Delay	Center-off delay
T6	Re-Transfer Delay	Re-Transfer Delay
T7	Genset Start Delay	Genset start delay
T8	Loadshed Delay	Loadshed delay
T9	Genset Cool Delay	Genset cool delay
T10	Genset Fail Delay	Genset fail delay
T13	On Load Test Delay	On load test delay
T14	Off Load Test Delay	Off load test delay
Power supply models		An additional power supply connection for controller
Auto-return		A working mode for ATSE controller
Non-return		A working mode for ATSE controller
Manual-return		A working mode for ATSE controller
Load shed		A signal from ATSE controller to shed the load
Transfer inhibit		Override transfer orders
Genset start		A Genset start signal from controller
Fire protection		Shed the ATSE when fire signal is received
Voluntary remote control		Transfer remotely
External 24 Vdc		External power for controller/communication