Substation Test Set: STS 4000
This current injection testing system is designed to perform primary tests for substation commissioning. It performs accurate tests on CTs, VTs, PTs and earth grids. 
Unlike the STS5000, this model has only low-current outputs and must be connected to a BUX5000 module for primary testing. 

Main Features:  
Fully automatic 
Primary injection testing capabilities: N/A for standard unit (up to 5000 A /7000 A, with optional module BUX 5000)
Variable output frequency: 15 - 500 Hz 
Power dissipation factor test with optional module TD 5000 ( voltage up to 12 kV) 
2000V AC high-pot test 
Local control with built-in HMI 
PADS - Power Apparatus Diagnostic Software for automatic testing, assessment and report generator. 
IEC 61850-9-2 communication protocol 
Patented technology for Capacitance and Tan Delta measurement 
USB interface and Ethernet interface for PC connection. 
Compact and lightweight.