EA Technology UTL2 Bedienungsanleitung

UltraTEV Locator Probe Operating Manual

Model Number: UTL2

Version: V01.03.00

Date: July 2021

EA Technology Limited, Capenhurst Technology Park, Capenhurst, Chester, CH1 6ES, UK

Tel: +44 (0)151 339 4181 http://www.eatechnology.com

Registered in England number 256631

EA Technology UltraTEV Locator Probe Operating Manual 2852-MANUL-V01.03.00

Safety Precautions and Procedures

The UltraTEV Plus² and Locator probe are designed to detect partial discharge sources in High

Voltage (HV) Plant.

If no discharges are detected, this does not necessarily imply that an item of HV Plant is discharge

free. Discharge sites often have dormant periods and insulation structures can fail through causes

other than those attributable to partial discharges.

If discharges of considerable magnitude are detected in plant that is connected directly to the high

voltage power system, the authority responsible for the plant should be notified.

Warnings

•The UltraTEV Plus² and Locator probe are designed for use at ground potential only.

•When testing electrical plant ensure that the metalwork is earthed before applying the

UltraTEV Plus² and Locator probe.

•Maintain safety clearances between structures at high voltage and the instrument and the

operator at all times.

•Adhere strictly to local safety procedures.

•Do not make measurements when there are electrical storms in the vicinity.

•Do not make measurements immediately following the energisation of a circuit.

•Do not disturb plant during measurements either mechanically e.g. by shaking or striking

it, electrically e.g. by increasing the voltage or physically e.g. by applying heat.

•Do not operate the instrument or its accessories in an explosive atmosphere.

EA Technology UltraTEV Locator Probe Operating Manual 2852-MANUL-V01.03.00 
 
 
Contents 
General Description ......................................................................................................................................1 
1 The UltraTEV Locator Probe ....................................................................................... 1 
2 Non-Intrusive Detection of Partial Discharge Activity ................................................. 2 
Preparations for use .....................................................................................................................................3 
1 Connecting the Locator probe to the UltraTEV Plus² .................................................. 3 
2 Calibrate.................................................................................................................... 4 
3 Locator probe Function Check ................................................................................... 5 
Operating Instructions ................................................................................................................................6 
1 Locator Mode ............................................................................................................ 7 
2 Locator Advanced Mode .......................................................................................... 10 
Technical Specification ............................................................................................................................. 13 
1 General.................................................................................................................... 13 
2 Environmental ......................................................................................................... 13 
3 Accessories and Options ......................................................................................... 13 
Declaration of Conformity ...................................................................................................................... 14 
Maintenance.................................................................................................................................................. 14 
Warranty Policy ............................................................................................................................................ 14 
Calibration ..................................................................................................................................................... 16 
Repair .............................................................................................................................................................. 16 
Waste Electrical and Electronic Equipment Directive (WEEE) .................................................... 16 
Continuous Improvement........................................................................................................................ 16 
Contact Us...................................................................................................................................................... 17 
Record of Changes ..................................................................................................................................... 18 
 
 
 

EA Technology UltraTEV Locator Probe Operating Manual 2852-MANUL-V01.03.00

Page 1 of 19

1. General Description

1.1 The UltraTEV Locator Probe

The Locator probe is used in conjunction with

the UltraTEV Plus² to further locate TEV

activity, detected during a routine PD survey

of substation assets.

The Locator probe adds a second TEV sensor

to the UltraTEV Plus2. Both TEV sensors listen

for TEV pulses, and when they both detect

pulses they calculate the difference in arrival

time. The standard Locator mode shows

which probe detected the signal first,

indicating the source is closer to that probe.

In some cases of PD, such as when multiple

sources are present, it can be useful to have

more information than which probe is closer

to the source. For such cases the Locator

Advanced Mode provides additional

information in the form of a histogram which

can be used to accurately assess the live data.

This live data can be used to locate multiple

sources at the same time.

The Locator probe is supplied in its own carry

case which can be attached to the top or bottom

of the UltraTEV Plus² carry case, by rotating the

blue T-lock.

TEV Sensor

Magnet

Power Indicator

Down

Level

Cable to UltraTEV Plus²

EA Technology UltraTEV Locator Probe Operating Manual 2852-MANUL-V01.03.00

Page 2 of 19

1.2 Non-Intrusive Detection of Partial Discharge Activity

Partial discharges are electric discharges that do not completely bridge the electrodes. The

magnitude of such discharges is usually small however they do cause progressive deterioration of

insulation that may lead to eventual failure.

Non-intrusive partial discharge detection provides a means for identifying these potential sources

of insulation failure that result not only in loss of supply to customers but can also endanger staff.

A partial discharge emits energy in the following ways:

Electromagnetic:

•Radio

•Light

•Heat

Acoustic:

•Audio

•Ultrasonic

Gases:

•Ozone

•Nitrous oxides

The most practical techniques for non-intrusive testing are based on the detection of the radio

frequency part of the electromagnetic spectrum and ultrasonic emissions. The UltraTEV range has

been specifically developed to enable electromagnetic and ultrasonic activity to be detected in a

single simple to use instrument.

Airborne Ultrasonic Discharge Activity

Acoustic emission from partial discharge activity occurs over the whole acoustic spectra. Audible

detection is possible but depends on the hearing ability of the individual. Using an instrument to

detect the ultrasonic part of the acoustic spectra has several advantages. Instruments are more

sensitive than the human ear, are not operator dependent and operating above the audible frequency

are more directional.

The most sensitive method of detection is using an airborne ultrasonic microphone centred at 40

kHz. This method is very successful at detecting partial discharge activity provided there is an air

passage between the source and the microphone.

Electromagnetic Discharge Activity

When partial discharge activity occurs within high voltage switchgear it generates electromagnetic

waves in the radio frequency range which can only escape from the inside of the switchgear through

openings in the metal casing. These openings may be air gaps around covers, or gaskets, or other

insulating components. When the electromagnetic wave propagates outside the switchgear it also

impinges on the metal casing of the switchgear producing a transient in the earth potential. The

Transient Earth Voltage (TEV) is only a few millivolts and lasts only a short time with a rise time of a

few nanoseconds.

EA Technology UltraTEV Locator Probe Operating Manual 2852-MANUL-V01.03.00

Page 3 of 19

2. Preparations for use

2.1 Connecting the Locator probe to the UltraTEV Plus²

The Locator probe has a fixed 2m cable and a 6m extension cable for a maximum location range of

8 metres. The Locator probe is plugged directly into the UltraTEV Plus² accessory port. When the

Locator probe is connected, the UltraTEV Plus² will automatically program the Locator probe with

the correct version of firmware. This process takes between 2 and 4 seconds. When the Locator

probe is ready to use, the Power Indicator will illuminate red.

EA Technology UltraTEV Locator Probe Operating Manual 2852-MANUL-V01.03.00

Page 4 of 19

2.2 Calibrate

Each time a Locator probe is connected to an UltraTEV Plus², it will need to be calibrated to the

UltraTEV Plus².

With the Locator probe connected to the UltraTEV Plus², select Locator/Locator Advanced Mode and

follow the on screen instructions.

EA Technology UltraTEV Locator Probe Operating Manual 2852-MANUL-V01.03.00

Page 5 of 19

2.3 Locator probe Function Check

The Locator probe function check is designed to allow users to verify the functionality of their

instrument using an in built test source. From the Main Menu, navigate to Function Check then

toggle on the Locator Test Source and navigate back to the Locator Advanced screen. Hold the

Locator probe and the UltraTEV Plus2together (TEV plate to TEV plate), the Locator Advanced screen

will show the histogram peak on the left hand side of 0, closest to the Locator probe, as shown

below:

Function Check Menu

Function Check in Locator Advanced Screen

Do not take measurements with the test source turned on.

The Calibrate process and Function Check are not a substitute for annual factory

calibration.

EA Technology UltraTEV Locator Probe Operating Manual 2852-MANUL-V01.03.00

Page 6 of 19

3. Operating Instructions

It is recommended, but not required, that during locating, the user holds the UltraTEV Plus2in their

right hand and the Locator probe in their left hand, so the trigger levels and indicators are on the

correct sides of the UltraTEV Plus² screen. When locating across larger distances, the Locator probe

can be attached to the switchgear using the magnet which is located behind the TEV plate at the top

of the probe. The Locator probe should be placed on the switchgear in a vertical position, to allow

correct fixing of the magnet.

The Locator Probe and UltraTEV Plus² should be used 10cm or more apart, to allow

discrimination between the two probes.

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