China AC Spark Tester, Wire Cable Spark Testing Machine, Default Commercial Frequency

Product Description

ST-15/25A Commercial Frequency AC Spark Tester

ST-15/25A Commercial Frequency AC Spark Tester is a special-purpose test apparatus to detect fault of insulation on wire and cable. Integrated with the technology of solid-state AC voltage regulation and single piece microprocessor control, the machine features steady voltage output (unaffected by variation of supply voltage), high sensitivity of fault detection, versatility, user-friendliness, safety and reliability, new construction and beautiful appearance. The work principle of the spark tester is as follows: Make the tested wire pr cable travel through the high voltage bead-chain electrode having test potential supplied by a commercial frequency HV transformer. If the insulation has fault, breakdown will occur, namely the output of the HV transformer will cause a HV spark short-circuit. The short circuit current flows from the output terminal of the HV transformer through insulation fault-conductor of cable-earth-ground-HV transformer to form a circuit. Therefor both the spark tester and the conductor of cable shall be soundly earth-grounded otherwise the short circuit cannot be formed and the cabinet of the spark tester and conductor of cable may have high voltage.

Technical Parameters

 

Type	ST-15A	ST-25A	ST-25AT
Voltage output	1.0-15.0kV	2.0-25.0kV	2.0-25.0kV
Voltage indication error	<5%	<5%	<5%
Detection sensitivity	<600µA	<600µA	<600µA
Stability	Complying with the requirements of GB3048.9-1994 and JB/T 4728.10
Detection resolution	0.05s	0.05s	0.05s
Transient breakdown current	100mA	50mA	50mA
Steady short-circuit current	<20mA	<20mA	<20mA
Detection speed, Max	300m/min	350m/min	350m/min
Overall diameter of tested wire or cable, max	≤30mm	≤55mm	≤95mm