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System Overview
The ASM is a permanently installed monitor for the detection of partial discharges in high voltage plant.
The ASM is designed to give continuous coverage of the electrical plant being monitored, in particular PD
that occurs in switchgear, panels, transformers and cables.
The monitor acquires partial discharge signals using distributed sensors as shown
Sensors
Sensors are distributed around the substation according to monitoring requirements.
Both active (with integral amplifiers) and passive transducers are available including the following:
BP 1
 High Frequency CTs for earth conductors  
BP 2
 Capacitively Coupled sensors for detection of transient earth voltages on metal clad switchgear  
BP 3
 Airborne Acoustic for corona detection  
BP4
 Temperature and Humidity for environment condition monitoring  
     
Up to 128 sensors can be monitored by a single ASM.
 
Multiplexers
Multiplexers are used to select batches of up to eight sensors at a time. Up to 16 Multiplexers can be daisy
chained together. Each multiplexer is given a unique address, allowing the ASM to access channels from
all multiplexers sequentially. The multiplexers energise the transducer cables where active sensors are
being used.
ASM Monitor

The ASM Monitor records data from all the sensors. Multiplexers are individually and sequentially addressed and data from each channel is simultaneously acquired.
Data is sampled across the power cycle (50Hz or 60Hz) at a sampling rate of 100Msamples/sec.
From this data a Peak value (maximum) and Count (number of times a pre-set threshold is exceeded) are calculated.
The acquired signals along with the calculated values are stored in a local database ready for access by the central Server.
IPEC Ltd, Rutherford House, Manchester Science Park, Manchester, M15 6GG, United Kingdom.