MEGGER 220070 70KV HIPOT TESTER

Time-varying tests such as the polarization index test ( PI test) are independent of temperature effects and save time. To perform this test, a predetermined test voltage is applied to the unit under test and readings are taken at 1 minute and 10 minutes. The resulting ratio is analyzed to determine insulation quality. This type of test is especially appropriate for high-capacitance samples. The step-voltage test is independent of temperature effects and saves time. To perform this test, the output voltage is increased in even steps at regular intervals over a fixed period of time. As long as the resistance of the unit under test increases with time, it has high-quality insulation. This type of test is only useful for high-capacitance samples. Features: Operates Like a Full-Wave Rectified Unit ( Filtered Half-Wave Rectification) Provides the advanced performance equal to a full-wave rectified unit. Allows for a simple circuit scheme for long-term reliability. Lightweight High-Voltage Module Air insulated, it is the lightest weight module available for its voltage and power ratings. Convenient portability allows a single operator to transport it into the field. Complete Internal Guard Circuit/ Guard Connection on High-Voltage Output Cable Intercepts stray surface leakage currents which could interfere with the measurement. Eliminates the need for an extra lead to hook up the guard connection. Ensures highly accurate measurements. Choice of Digital or Analog Metering The preferred medium may be selected by the user. Continuously Variable Test Voltage User can set test voltage to intermediate values as required. Fast Charging of High-Capacitance Samples Saves the operator test time. Negative Polarity to Ground Applies a worst-case condition to assure reliability. Strip Chart Recorder ( Optionally Available) Provides a permanent record of the leakage current for the unit under test. Standard Safety Features Bipolar ammeter that displays the magnitude of the discharge current from the unit under test ( digital models only) Input-supply-line circuit breaker Output current overload relay Zero-start interlock for high-voltage output Pushbutton controls and indicating lights for high-voltage ON/ OFF Full circuit-breaker protection against internal damage by overloads, surges or test sample breakdown Connection for external permissive and safety interlocks Model Capabilities/ Applications 70-kV DC Dielectric Test Set Acceptance testing on 15 kV class cable Maintenance testing on 28 kV class cable