HVPD Kronos® Portable Monitor Specification

HVPD Kronos® Portable Monitor specification is available for download here.

No. Requirement Compliance Deviation 
Yes No
1. General
1.1 A portable, continuously powered, on-line partial discharge (OLPD) test and monitoring system capable of detecting and trending Partial Discharge (PD) activity on-line. The system shall be suitable for monitoring different types of indoor and outdoor medium and high voltage plant including cables, metal clad switchgear, rotating machines, transformers and other plant. Yes    
1.2 The system should have a wide bandwidth of at least 50MHz and fast sampling rate of at least 100MS/s to allow the shape of the PD pulse shapes to be recorded accurately, essential for identification of PD sources. Yes    
1.3 The system should have a high vertical resolution per acquisition of at least 14 bit; no averaging should be used to achieve this. Yes    
1.4 The system shall have at least 24 PD sensor input channels with multiplexing between channels. Yes    
1.5 PD signal acquisition shall be made synchronously on any 6x of the multiplexed input channels. Yes    
1.6 The system shall have an optional airborne acoustic sensor bus input for up to 32 daisy chained acoustic sensors with centre frequency 40kHz. Yes    
1.7 The system shall provide the user with an indication of the PD activity and trend in each item of monitored plant. Yes    
1.8 The system should be able to automatically differentiate pulses into 4x types (Cable PD, Machine PD, Local/Switchgear PD, and Noise).  Yes    
1.9 The system should be able to filter out noise whilst preserving the PD pulses using pulse wave shape analysis (PD event recognition). Yes    
1.10 The system should have at least 32 GB of built-in storage capacity for the operating system and to provide a short-term store for acquired data before upload to a data server, while supporting a lossless compression of the same. Yes    
1.11 The monitoring system shall capture data synchronously with the 50/60Hz voltage applied to the equipment under test.  Synchronisation should be from the unit line supply or an external sensor. Yes    
The unit should have an Ethernet connection and support the following protocols/services:
  • Modbus over TCP-IP
  • DNP3 over TCP-IP
  • Web Interface Service over HTTP/HTTPS
  • SSH
  • VNC
1.13 The unit shall be configurable with adjustable flag settings and alarm thresholds, which are to be set during an initial training period where required. Yes    
1.14 The unit shall include provision for alarms/flags to be communicated via network connectivity including SCADA, where required.  Yes    
1.15 The unit shall be able to log temperature and humidity using an external sensor input. Yes    
2. Hardware
The unit shall have the ability to connect to a wide range of separate OLPD sensors, including:
  • High Frequency Current Transformer (HFCT)
  • Transient Earth Voltage (TEV)
  • High Voltage Coupling Capacitor (HVCC) (80pF – 2nF)
  • Bushing tap adapter
  • Airborne Acoustic (AA) – Separate input for daisy chained sensors.
2.2 PD sensors shall connect to the unit using BNC type connectors and RG223 or equivalent 50Ω coaxial cables. Yes    
2.3 Acoustic sensors shall be daisy chained and connect to the unit using RJ45 type connector and Cat5E/Cat6 cabel or equivalent. Yes    
The system shall include as standard the following accessories:
  • Input cable management unit.
  • Mounting frame
Optional accessories shall include:
  • Temperature and Humidity Probe
  • LAN-Fibre optic adapter
  • Ethernet Switch
  • GPRS/3G Modem and antenna
2.6 The unit housing and all glanding (where used) should be IP52 Yes    
2.7 The unit shall be suitable for operation in ambient environment temperatures of: -20 to +45 Celsius. Yes    
3. Guarantee and Warranty Period
3.1 The test unit, sensors and accessories shall have a 12-month standard hardware warranty. Yes    
3.2 The unit shall be provided with an optional extension to warranty on request, in conjunction with an After-Sales Service Contract. Yes    
4. Training and Transfer of Technologies Requirements
4.1 Optional customer specific training available in use of the system. Yes    
5. After-Sales Service Contract (Optional)
5.1 The supplier shall offer diagnostic advice based on monitoring data access provided by the end user. Yes    
5.2 Technical support from HVPD engineers (via email/phone) Yes    
5.3 Emergency response by phone or email on any identified incidents (within 24 hours) Yes    
5.4 One site visit per annum to carry out diagnostic testing and location (first visit recommended to be carried out three months after completion of the commissioning). Yes    
5.5 Periodic condition monitoring reports at regularity to be agreed between client and supplier. Yes    
5.6 The supplier shall provide support on-event where the system has remote connection or manual data transfer to the supplier. Yes    
5.7 Diagnostic recommendations from OLPD monitoring data and maintenance intervention advice Yes    
5.8 Comparison and benchmarking of the OLPD activity in the assets monitored across the network with existing asset knowledge. Yes    
5.9 Annual software upgrades of monitoring system and server/database software. Yes    
6. Summary of Main Technical Parametres
6.1 PD Input Channels: 24 Yes    
6.2 PD Channels with multiplexed acquisition: 24  Yes    
6.3 PD Channels with synchronous acquisition: 6 Yes    
6.4 Synchronous acquisition from any 6 of 24 input channels. Yes    
6.5 PD acquisition bandwidth: ≥50MHz Yes    
6.6 PD acquisition sampling rate: ≥100MS/s Yes    
6.7 PD acquisition vertical resolution: ≥14 bit Yes    
6.8 PD acquisition channel sample memory: ≥2MPts Yes    
6.9 Compatible with High Frequency Current Transformer (HFCT) PD sensors. Yes    
6.10 Compatible with Transient Earth Voltage (TEV) PD sensors. Yes    


Compatible with High Voltage Coupling Capacitor (HVCC) PD sensors with 80pF capacitance. Yes    
6.12 Compatible with High Voltage Coupling Capacitor (HVCC) PD sensors with 500pF – 2nF capacitance. Yes    
6.13 Compatible with Bushing tap adapter PD sensors. Yes    
6.14 Compatible with Airborne Acoustic (AA) PD sensors. Yes    
6.15 Total Airborne Acoustic sensors (daisy chained): 32 Yes    
6.16 Airborne Acoustic sensors detection frequency: 40kHz Yes    
6.17 Other connections:
  • Ethernet
  • Temperature/humidity probe
  • 50/60Hz Synchronisation
6.18 Ability to remotely monitor PD in machines with HFCT sensors installed onto connected power cables at switchgear. Yes    
6.19 PD and noise separation based on signal pulse waveform characteristics (PD event recognition). Yes    
6.20 PD and noise separation based on double/twin coupler installation (2 sensors per phase). Yes    
Storing of different types of PD:  
  • Switchgear/Local
  • Cable PD
  • Machine PD
  • Noise
Storing PD summary parameters:    
  • Peak PD level per power cycle
  • PD count per power cycle
  • PD activity per power cycle
PD and noise separation with clustering diagrams using any two of following parameters:
  • Pulse rise time
  • Pulse fall time
  • Pulse width
  • Pulse frequency
  • Phase position
  • Pulse magnitude (mV)
  • Pulse area (nVs or pC)
6.24 User interface for PD trend display. Yes    
6.25 Data transfer to server with PD results database using Ethernet connection. Yes    
6.26 User interface for heatmap style PD phase pattern display. Yes    
6.27 User interface for PD pulse waveform (PD events) display. Yes    
6.28 Automatic transfer of data from monitor to server/database located at-site. Yes    
6.29 Web-based user interface with PDresults on single line diagram user interface. Yes