Remote partial discharge measurement without interrupting line service APD-LT
Wireless partial discharge meter
Description and advantages
The APD-LT is a portable partial discharge meter designed to inspect in-service cable and overhead-line accessories, such as cable heads, line arrestors, insulators and bushings. The capacitive sensor is applied from the ground or with an insulated hotstick, with no need for direct contact with the conductor, and transmits the reading wirelessly to a remote display that shows the discharge level in real time.
Contactless measurement without interrupting service
The APD-LT's capacitive sensor is applied to the line accessory with no need for direct contact with the conductor or for disconnecting the installation, allowing energised equipment to be inspected with maximum safety for the operator.
Compact, lightweight and hotstick-ready
The measurement module attaches to any standard insulated hotstick through a universal end fitting, and its reduced weight makes it easy to handle during extended overhead-line inspections.
Wireless reading at a distance
The reading is transmitted by radio frequency to an independent remote display, so the operator can move away from the measuring point and check the discharge level without approaching the energised accessory.
Long autonomy and immediate start-up
The measurement module runs on a standard 9V alkaline battery, offers up to ten hours of continuous use, and switches off automatically after a period of inactivity to extend battery life.
Wireless remote display with decibel level indicator
Applications and operation
Applications
- Partial discharge detection in cable heads.
- Partial discharge detection in line arrestors.
- Partial discharge detection in insulators.
- Partial discharge detection in bushings.
Operation
Measurement on overhead lines
The measurement module is applied to the energised line accessory from the ground or with an insulated hotstick, with no need to climb the structure or to interrupt the installation's service.
Wireless reading at a distance
The sensor reading is transmitted by radio frequency to the remote display, so the operator can stay away from the measuring point while checking the partial discharge level.
Levels and indicators
The remote display shows the discharge level in decibels on a numeric indicator, together with separate warnings for low battery and for overload of the signal picked up by the sensor.
Sensor and autonomy
The adjustable capacitive sensor adapts to the geometry of the inspected accessory, and the measurement module runs on a 9V alkaline battery with up to ten hours of continuous use.
Accessories and options
Wireless remote display
Independent unit that receives the measurement module's reading by radio frequency and shows it on a numeric indicator, together with battery status and signal-overload detection.
Universal hotstick end fitting
Allows the measurement module to be attached to any standard insulated hotstick used in the industry, for checking overhead-line accessories from the ground or from an aerial bucket.
Adjustable capacitive sensor
Highly sensitive sensor built into the measurement module, adjustable to match the geometry of the inspected accessory with no need for direct contact with the conductor.
APD-LT wireless remote display
Semi-rigid carrying case
Semi-rigid case that holds the measurement module, the remote display and their accessories, making the equipment easier to transport and protect between sites.
| APD-LT — TECHNICAL SPECIFICATIONS |
|---|
| Measurement module handling Compatible with universal insulated hotstick (standard end fitting) |
| Measurement module power supply 1 9V alkaline battery |
| Autonomy 10 hours of continuous use; auto shut-off after 15 min (configurable) |
| Absolute maximum input signal 16 dBm, 3 dBV (1.4 VAC) |
| Dynamic range 60 dB |
| Accuracy ± 2 dB (direct contact injection) |
| Bandwidth 30 MHz to 47 MHz (direct contact injection) |
| Wireless communication Bluetooth Low Energy (BLE) 4.1, up to 30 m typical range |
| Wired connection USB 2.0, micro-B, for firmware upgrade |
| Measurement module protection rating IP66 |
| Measurement module weight and dimensions 0.43 kg; 192.5 x 120.7 x 47.4 mm |
| Measurement module operating temperature -20°C to 55°C; 0 to 95%RH non-condensing |
| Measurement module storage temperature -40°C to 55°C |
| Remote display 5.5-inch colour touchscreen, sunlight readable, 720 x 1440 px |
| Remote display battery Non-removable 4200 mAh lithium |
| Remote display protection rating IP68 (1.2 m for 30 minutes) |
| Remote display weight and dimensions 196 g; 165 x 82.5 x 12.5 mm |
| Approval CE directive |
Specifications subject to change without notice. The measurement module and the remote display form a paired wireless set; they are not sold separately.
| C/ María Barbeito, 14 | Contact Contact +T [+34] 982 20 99 20 |
|---|---|
| 27003, Lugo, Spain | +T [+34] 982 20 99 20 info@amperis.com | www.amperis.com |