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ST-15/25A Commercial Frequency AC Spark Test
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. There for 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 ≤ 100mm
Work conditions
Supply voltage: AC220V±10%
Supply frequency:50±2Hz
Ambient temperatures: 0~40c°
Relative humidity, max:85% (without condensed water)
Mode of operation: continuous operation
Breakdown indication
Mode of indication: Breakdown count and voice/light alarm
Count range: 0~999
Time duration for voice/light alarm:0.5-15 adhustable
Safety interlock
In order to ensure safety for operators, the probe is provided with an interlock switch and a discharge rod .When the front hood is opened, the high voltage is cut off first, then the discharge rod touches the electrode section to discharge the remaining electricity.
