Bender EDS3090, EDS3096, EDS3092 User Manual
Manual
EN
EDS3090
EDS195P
ISOSCAN®
I
s
I
n
AL
ARM
I
n
I
s
INF
O
M
EN
U
H
OL
D
R
ESE
T
ESC
O
K
…91, …92, …96
Portable equipment for insulation fault location
for energised and deenergised AC and DC systems
Software version: D399 V2.0
EDS309x_D00012_03_M_XXEN/11.2014
Bender GmbH & Co. KG
P.O.Box 1161 • 35301 Grünberg • Germany
Londorfer Straße 65 • 35305 Grünberg • Germany
Tel.: +49 6401 807-0 • Fax: +49 6401 807-259
E-mail: info@bender.de • www.bender.de
Photos: Bender archives and bendersystembau archives.
© Bender GmbH & Co. KG
All rights reserved.
Reprinting only with permission
of the publisher.
Subject to change!
Table of Contents
1. How to get the most out of this manual ............................................................. 7
1.1 How to use this manual ......................................................................................................... 7
1.2 Explanations of symbols and notes ................................................................................... 7
1.3 Overview of chapters .............................................................................................................. 8
2. Safety instructions .................................................................................................. 9
2.1 Intended use .............................................................................................................................. 9
2.2 Device-specific safety instructions .................................................................................... 9
2.3 General safety instructions ................................................................................................ 10
2.4 Qualified personnel .............................................................................................................. 10
3. System description .............................................................................................. 11
3.1 System components ............................................................................................................11
3.1.1 Overview of system components ................................................................................... 11
3.1.2 Insulation fault location equipment type list ............................................................. 12
3.1.3 Accessories .............................................................................................................................. 13
3.2 Function of the system components ............................................................................. 14
3.2.1 Locating current injector PGH18… ................................................................................ 14
3.2.2 Insulation fault locator EDS195P ..................................................................................... 14
3.2.3 Measuring clamps ................................................................................................................. 14
3.2.4 Coupling device AGE185 .................................................................................................... 15
3.3 Operating principle for insulation fault location (IΔL) ............................................. 15
3.3.1 Schematic diagram EDS system ...................................................................................... 16
3.3.2 Test cycle .................................................................................................................................. 16
3.3.3 Definitions ............................................................................................................................... 17
3.3.4 Currents in the EDS system ............................................................................................... 17
3.4 Operating principle for residual current measurement (IΔn) ............................... 18
4. Considerations prior to use ................................................................................ 19
4.1 How does the equipment for insulation fault location work ................................ 19
4.2 Requirements for reliable insulation fault location .................................................. 20
4.3 Reduced locating current .................................................................................................. 22
4.4 Response sensitivity characteristics of the EDS195P ............................................... 22
4.4.1 Response characteristics for main circuits in 3AC systems .................................... 23
EDS309x_D00012_03_M_XXEN/11.2014
3
Table of Contents
4.4.2 Response characteristics for main circuits in AC systems ....................................... 24
4.4.3 Response characteristics for main circuits in DC systems ....................................... 24
4.4.4 Response characteristics for control circuits in AC systems ................................... 25
4.4.5 Response characteristics for control circuits in DC systems .................................. 25
5. Connecting the locating current injector ....................................................... 27
5.1 Disconnecting insulation monitoring device .............................................................. 27
5.2 Locating current injector in an electrically isolated IT system .............................. 27
5.3 Connection to a live IT system .......................................................................................... 28
5.4 Connection to a PV system ................................................................................................ 29
6. Operation ............................................................................................................... 31
6.1 Short description of insulation fault location (EDS mode) ..................................... 31
6.1.1 Commissioning the PGH18… for locating current injection ................................. 31
6.1.2 Insulation fault location using EDS195P ....................................................................... 31
6.2 Detailed description of insulation fault location ........................................................ 31
6.3 Description of a residual current measurement ......................................................... 31
6.4 Displays and controls on the PGH18… ......................................................................... 32
6.5 Displays and controls on the EDS195P .......................................................................... 33
6.6 Operating the EDS195P ....................................................................................................... 34
6.6.1 Switching on and off the device ...................................................................................... 34
6.6.2 Changing the measuring clamp ....................................................................................... 35
6.6.3 Improved legibility due to display lighting .................................................................. 35
6.6.4 Changing between insulation fault location IΔL and
residual current measurement IΔn operating modes .............................................. 35
6.6.5 Quickly checking the response values for IΔL and IΔn ............................................ 35
6.6.6 Checking Info menu ............................................................................................................. 35
6.6.7 Significance of the display elements .............................................................................. 36
6.7 Standard displays on the EDS195P ................................................................................. 36
6.7.1 EDS measurement (IΔL) ....................................................................................................... 36
6.7.1.1 Standard display if there is no cable to be measured in the clamp ............. 36
6.7.1.2 Standard display for EDS measurement (IΔL) with cable in the clamp ....... 37
6.7.1.3 Standard display for measuring faults or pauses between changes in polarity
of the measuring pulse ................................................................................................. 37
6.7.2 RCM measurement (IΔn) ..................................................................................................... 37
6.7.2.1 Standard display for RCM measurement (IΔn) with cable in the clamp ..... 37
6.8 Alarms during EDS measurement or RCM measurement ....................................... 37
6.9 Indication of device and measuring errors .................................................................. 38
6.10 Factory settings EDS195P (state as supplied) .............................................................. 38
6.11 Menu structure ....................................................................................................................... 39
4
EDS309x_D00012_03_M_XXEN/11.2014
Table of Contents
6.11.1 Navigating in the menu ...................................................................................................... 40
6.11.2 Menu item: Settings ............................................................................................................. 40
6.11.3 Menu item: System .............................................................................................................. 41
6.11.4 Menu item: Harmonics ........................................................................................................ 41
6.11.5 Menu item: IΔL alarms ......................................................................................................... 41
6.11.6 Menu item: IΔn logger ........................................................................................................ 42
6.12 Practical usage ....................................................................................................................... 42
6.12.1 Insulation fault location in a system without a permanently installed EDS
6.12.2 Insulation fault location in a system with a permanently installed EDS system ..
6.12.3 Insulation fault location in diode-decoupled DC systems ..................................... 47
6.12.4 Usage of the EDS195P as a residual current meter ................................................... 49
6.12.5 Indication of the harmonics during residual current measurement .................. 50
6.13 Coupling device AGE185 for higher system voltages ............................................. 51
6.14 Power supply for the EDS195P ......................................................................................... 52
6.14.1 Displaying charge state ...................................................................................................... 52
6.14.2 Changing batteries ............................................................................................................... 52
6.14.3 Power supply unit supplied .............................................................................................. 52
system ....................................................................................................................................... 42
45
7. Technical specifications ...................................................................................... 53
7.1 Technical specifications for the system EDS309… ................................................... 53
7.2 Technical specifications PGH18… .................................................................................. 53
7.3 Technical specifications EDS195P ................................................................................... 54
7.4 Technical specifications measuring clamps ................................................................ 55
7.5 Technical specifications AGE185 ..................................................................................... 56
7.6 Standards ................................................................................................................................. 56
7.7 Dimension diagrams ............................................................................................................ 57
7.8 Status word ............................................................................................................................. 58
7.9 Ordering data including accessories ............................................................................. 59
7.10 Component list ...................................................................................................................... 60
8. Frequently Asked Questions .............................................................................. 61
INDEX ...........................................................................................................................63
EDS309x_D00012_03_M_XXEN/11.2014
5
Table of Contents
6
EDS309x_D00012_03_M_XXEN/11.2014
1. How to get the most out of this manual
DANGER
WARNING
CAUTION
1.1 How to use this manual
This operating manual describes the basic principles of insulation fault location as well as connecting
and operating an item of portable equipment for insulation fault location. It is designed for qualified
electricians, and in particular for those designing, installing and operating electrical equipment.
Please read this detailed operating manual and the enclosed sheet entitled "Important safety instructions for Bender products" prior to using the EDS3090. This document must be kept in easy
reach in the case.
If you have any questions, please do not hesitate to contact us. Please contact our Technical Sales
Department. We are also happy to provide on-site service. Please contact our Service Department for
more information.
Service helpline: 0700-BenderHelp (telephone and fax)
Carl-Benz-Strasse 10 • 35305 Gruenberg • Germany
Tel: +49 6401 807-760 • Fax: +49 6401 807-629
E-mail: info@bender-service.com • www.bender.de
1.2 Explanations of symbols and notes
To make it easier for you to understand and revisit certain sections of text and instructions in the
manual, we have used symbols to identify important instructions and information. The meaning of
these symbols is explained below:
The signal word indicates that there is a high risk danger that will result in electrocution or serious injury if not avoided.
This signal word means that there is a medium risk of danger that can lead to
death or serious injury, if not avoided.
This signal word indicates a low level risk that can result in minor or moderate
injury or damage to property if not avoided.
This symbol denotes information intended to assist the user
to make optimum use of the product.
EDS309x_D00012_03_M_XXEN/11.2014
7
How to get the most out of this manual
1.3 Overview of chapters
1. How to get the most out of this manual:
This chapter provides information about using this documentation.
2. Safety instructions:
This section provides information about risks affecting installation and operation.
3. System description:
In this chapter you will find an overview of the system components, a description of their function and the basic principles of insulation fault location.
The principle of residual current measurement is described in the final section.
4. Considerations prior to use:
This chapter describes the practical aspects of insulation fault location and provides numerous
characteristic curves for assessing the response values to be set.
5. Connecting the locating current injector:
The connection of the PGH18… to a system to be tested is described here.
6. Operation:
This chapter contains a description of the graphical user interface on the EDS195P. There is
also an illustration of the menu structure as well as illustrations of the various standard displays.
You will also find information of the supply of power to the EDS195P here.
7. Technical specifications:
Along with tabular data this chapter contains information on standards and the dimensions of
the system components.
8. Frequently Asked Questions:
Use this chapter to quickly identify and rectify any malfunctions that occur.
9. INDEX:
Use the index to quickly find the desired keywords.
8
EDS309x_D00012_03_M_XXEN/11.2014
2. Safety instructions
CAUTION
CAUTION
2.1 Intended use
The portable insulation fault location system EDS309… is used to locate insulation faults in IT systems. All variants are suitable for the measurement of residual currents in TN and TT systems. The
EDS3096PG is particularly suitable for insulation fault location in electrically isolated systems.
Please observe the limits on the area of application stated in the technical specifications, as well as
the measuring categories for the measuring clamps used. If, in the specific case, measuring current
transformers other than the measuring clamps supplied are used with the EDS195P, attention is to
be paid to ensuring the connection wires and transformer have an adequate nominal insulation voltage (overvoltage category, see Technical specifications)
Use which deviates from or is beyond the scope of these technical specifications is considered noncompliant.
System interference and high system leakage capacitances can degrade the accuracy of the measurement.
2.2 Device-specific safety instructions
Hazard due to excessively high locating current or excessively high
locating voltage!
An excessively high PGH18… locating current may damage sensitive loads (e.g.
in control circuits) or trigger unintended switching processes. For this reason
select a lower locating current for these systems (1 or 10 mA).
For instance it is only allowed to use the EDS3091 or EDS3091PG in systems with
programmable logic controllers (PLCs).
The locating voltage of DC 50 V produced by the locating current injector
PGH186 can cause interference at sensitive system components. In case of
doubt, contact Bender.
The locating current from the PGH185 or PGH186 can cause residual current devices to trip. The locating current is limited to maximum 25 mA (or 10 mA), however 30 mA residual current devices may trip, for instance, between 15 and 30
mA.
It is necessary to aim for the best possible conductor symmetry in the measuring
clamp. Otherwise the measuring clamp may go into saturation due to an excessively high load current and cause an alarm I
Δ
n
>10A.
EDS309x_D00012_03_M_XXEN/11.2014
9
Safety instructions
2.3 General safety instructions
Along with this operating manual, the enclosed "Important safety instructions for Bender products"
form part of the documentation for this device.
2.4 Qualified personnel
Only a qualified electrician is allowed to use the EDS3090 devices. The electrician should be familiar
with the assembly, commissioning and operation of the equipment and have undergone appropriate training. The person using the EDS system must have read this manual and understood all the
instructions relating to safety.
10
EDS309x_D00012_03_M_XXEN/11.2014
3. System description
P
S
A
3
0
2
0
PGH186
100mA
M
10mA
25mA
Imax
ON
ON
Us
L1(+)
L2(-)
L3
3(N)AC 0...575V mit/with 500...790V
DC 0...504V AGE185 400...960V
PSA3052
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3.1 System components
On page 60, you will find a detailed overview of the scope of delivery of the EDS309x versions. The
following illustration provides a choice of the possible components.
3.1.1 Overview of system components
The primary task of the EDS309… is insulation fault location in IT systems. For this purpose the
individual components of the EDS309… are used in combination.
EDS195P
ILI
ISOSCAN®
n
ALARM
I n
I
L
ESC
HOLD
INFO
OK
MENU
RESET
Aluminium case with handle
1
Measuring clamp PSA3020 (main circuits) or PSA3320 (control circuits)
2
Clamp inside diameter 20 mm
Locating current injector PGH18…
3
For generating a locating current for insulation fault location
Insulation fault locator EDS195P
4
For connecting measuring clamps and for finding insulation faults
Measuring clamp PSA3052 (main circuits) or PSA3352 (control circuits)
5
Clamp inside diameter 52 mm
EDS309x_D00012_03_M_XXEN/11.2014
11
System description
3.1.2 Insulation fault location equipment type list
It is possible to undertake a residual current measurement in TT and TN systems (earthed systems)
using all the device variants listed below.
The following overview describes which measuring tasks can be undertaken with which models:
Equipment for insulation fault location in main circuits
1. Permissible system voltage in the main circuits:
– Insulation fault location in IT systems up to AC 42…460 Hz, 20…575 V and DC 20…504 V
– Insulation fault location using AGE185 up to AC 42…460 Hz, 500…790 V and DC 400…960 V
EDS3090:
Can be used in IT systems in which a locating current injector PGH471 or an IRDH575 is already
installed.
EDS3090PG:
Can be used in IT systems in which neither a locating current injector PGH471 nor an IRDH575 is
already installed.
Supply voltage for the locating current generator PGH185 supplied:
AC 50…60 Hz, 230 V
EDS3090PG-13:
Can be used in IT systems in which neither a locating current injector PGH471 nor an IRDH575 is
already installed.
Supply voltage for the locating current generator PGH185-13 supplied:
AC 50…60 Hz, 90…132 V
2. Permissible system voltage in the main circuits:
– Insulation fault location in IT systems up to AC 42…460 Hz, 0…575 V and DC 0…504 V
– Insulation fault location using AGE185 up to AC 42…460, Hz 500…790 V and DC 400…960 V
EDS3096PG:
Can be used in IT systems in which neither a locating current injector PGH471 nor an IRDH575 is
already installed.
Supply voltage for the locating current generator PGH186 supplied:
AC 50…60 Hz, 230 V
Insulation fault location, also in IT systems electrically isolated on all poles
EDS3096PG-13:
Can be used in IT systems in which neither a locating current injector PGH471 nor an IRDH575 is
already installed.
Supply voltage for the locating current generator PGH186-13 supplied:
AC 50…60 Hz, 90…132 V
Insulation fault location, also in IT systems electrically isolated on all poles
12
EDS309x_D00012_03_M_XXEN/11.2014
System description
EDS3096PV:
Applicable in PV systems without a locating current injector installed.
Supply voltage for the delivered locating current injector PGH186: AC 50…60 Hz, 230 V.
Insulation fault location, also in IT systems disconnected on all poles or in de-energised IT sys-
tems.
Equipment for insulation fault location in control circuits
Permissible system voltage in the control circuits:
Insulation fault location in IT systems up to AC 42…460 Hz, 20…265 V and DC 20…308 V.
EDS3091:
Can be used in IT systems in which a locating current injector PGH473 or an IRDH575 is already
installed.
EDS3091PG:
Can be used in IT systems in which neither a locating current injector PGH473 nor an IRDH575 is
already installed.
Supply voltage for the locating current generator PGH183 supplied:
AC 50…60 Hz, 230 V
EDS3091PG-13:
Can be used in IT systems in which neither a locating current injector PGH473 nor an IRDH575 is
already installed.
Supply voltage for the locating current generator PGH183-13 supplied:
AC 50…60 Hz, 90…132 V
Equipment for insulation fault location in main circuits and control circuits
EDS3092PG:
Contains the components and combines the features of the EDS3090PG and EDS3091PG
3.1.3 Accessories
You will find information on the standard accessories as well as on optional accessories in the ordering data on page 59 and in the component list on page 60.
Only use the components supplied by us on working with the EDS309…. Commercially available measuring clamps are not allowed to be used! This statement also applies to measuring clamps or measuring current transformers from
the Bender range that are not expressly intended to be used with the EDS309….
Along with the measuring clamps supplied, it is allowed to connect to the
EDS195P the following measuring current transformers from the Bender series:
WF…
W… /WR… /WS…
W…-8000/WS…-8000
Series W…AB current transformers cannot be used!
For series WF… current transformers you will need a BNC to PS2 adapter cable, see page 59.
EDS309x_D00012_03_M_XXEN/11.2014
13
System description
3.2 Function of the system components
3.2.1 Locating current injector PGH18…
The PGH18… generates a defined locating current. The magnitude of the current is dependent on
the insulation fault present and the system voltage.
The PGH185 or PGH186 limits the locating current to maximum 25 mA or maximum 10 mA
depending on the switch setting.
The PGH183 limits the locating current to maximum 2.5 mA or maximum 1 mA depending on
the switch setting.
The PGH186 applies the locating current in electrically isolated IT systems or in IT systems with
a system voltage < 50 V using an integrated voltage source (DC 50 V). In IT systems with a system voltage > 50 V the existing voltage in the system is used to drive the locating current.
3.2.2 Insulation fault locator EDS195P
The insulation fault locator EDS195P has the following measuring functions:
Insulation fault location I
– Either as a component of the portable equipment for insulation fault location EDS309…
– Or as an additional insulation fault locator in permanently installed equipment for insulation
fault location with IRDH575 or PGH1… as well as EDS46…/49….
Residual current measurement I
value range can be found in table 3.1 on page 14.
(EDS mode) for use in IT AC or DC systems:
ΔL
(RCM mode) for usage in TN or TT AC systems. The response
Δn
Response value
The response value is defined by the sensitivity of the EDS195P. This value can be set in both DC and
AC and 3AC IT systems as an arithmetic mean in accordance with Tabelle 3.1 auf Seite 14. System interference and high system leakage capacitances can degrade the accuracy.
3.2.3 Measuring clamps
Measuring clamps measure the locating current or the residual current. They have a test lead approx.
2 m long. The connection to the EDS195P is made using a BNC connection.
The following table summarises the most important data for the usage of the different measuring
clamps.
IT system
TN/TT system
Tab. 3.1: Measuring clamps and response values for the EDS195P
Main circuit
(EDS3090…, 3092…, 3096…)
Measuring
clamps
Measuring range 2…50 mA 0.2…5 mA
Response value
Measuring
clamps
Measuring range 5 mA…10 A 2 mA…2 A
Response value 10 mA…10 A 5 mA…1 A
PSA3020, PSA3052, PSA3165 PSA3320, PSA3352
2…10 mA,
PSA3020, PSA3052, PSA3165 PSA3320, PSA3352
±30% / ±2 mA
Control circuit
(EDS3091…)
0.2…1 mA, ±30 % / ±0.2 mA
If measuring current transformers are used instead of measuring clamps, you will need the adapter
supplied: BNC/4-mm connector. See table on page 60.
14
EDS309x_D00012_03_M_XXEN/11.2014
System description
3.2.4 Coupling device AGE185
The coupling device AGE185 expands the nominal voltage range of the equipment for insulation
fault location EDS309…. It enables the equipment to be connected to system nominal voltages up
to AC 790 V or DC 960 V.
3.3 Operating principle for insulation fault location (IΔL)
On the occurrence of the first insulation fault in IT systems a residual current flows that is essentially
defined by the system leakage capacitances. The basic concept of fault location is therefore to briefly
close the fault circuit using a defined resistance. With this principle a locating current is provided by
the system voltage and this locating current contains a signal that can be evaluated.
The locating current is generated periodically by the locating current injector PGH18… (part of the
EDS309…PG system).
The locating current can also be generated by an IRDH575 or a locating current injector PGH47….
The amplitude and duration of the locating current is limited. During this process the system conductors are alternately
connected to earth via a defined resistance. The locating current produced as a result is dependent
on the magnitude of the insulation fault present and the system voltage.
For example the locating current on the EDS3090 is limited to maximum 25 mA; with the setting
I
= 10mA it is limited to 10 mA. During planning it is to be ensured that there are no system com-
max
ponents in which this locating current could cause a reaction involving damage in unfavourable circumstances.
The locating current pulse flows from the locating current injector through the live conductors to the
insulation fault by the shortest route. From there it flows via the insulation fault and the earth cable
(PE cable) back to the locating current injector. This locating current pulse is detected by the measuring clamps or measuring current transformers in the insulation fault path and is indicated by the
insulation fault locator EDS195P connected.
You must ensure that all live conductors are routed through the measuring
clamp. Do not route any protective earth conductors or screens on
screened cables through the measuring clamp! Commercial measuring
clamps are not suitable for the EDS309… and must not be used.
Only if these notes are observed will you obtain a correct measurement result.
You will find additional information in our technical information Techinfo08
"Transformer installation".
EDS309x_D00012_03_M_XXEN/11.2014
15
3.3.1 Schematic diagram EDS system
U
n
IT-System
PSA...
EDS195P
PGH...
PE
R
F
L2(L-)
L1(L+)
2
3
1
EDS Start
Position
PGH...
12331
2 sec
4 sec
2 sec
4 sec
System description
EDS195P Insulation fault locator
PGH… Locating current injector
U
n
IT system voltage
PSA… Measuring clamp
R
F
Insulation fault
PE Protective earth conductor
3.3.2 Test cycle
The locating current pulse cycle has a duration of 6 seconds. The PGH… sends alternating positive
and negative locating current pulses. The sketch below shows the test cycle of the PGH… with the
different switch settings (1, 2, 3) on the device, see schematic diagram above.
16
EDS309x_D00012_03_M_XXEN/11.2014
System description
3.3.3 Definitions
I
= Locating current that flows through the locating current injector while the fault location
L
is running (EDS mode).
I
= Locating current measured by the insulation fault locator (EDS mode).
ΔL
I
= Residual current produced by an insulation fault (RCM mode).
Δn
3.3.4 Currents in the EDS system
As an addition to the schematic diagram on page 16, here the path of the residual currents and the
locating current is shown:
U
n
PE
.............
. .. .. ..
I
ΔL
C
E-V
C
E-N
R
F-V
R
F-N
IT-System
I
PSA...
Δn
IΔL
PGH...
3
R
F-V
EDS195P
C
E-N
1
2
C
E-V
I
L
Locating current circuit due to the insulation fault R
Residual currents I
(example)
Δn
F-N
R
F-N
Locating current measured by the EDS195P
Upstream capacitances, system leakage capacitances upstream of the
measuring current transformer
Downstream capacitances, system leakage capacitance downstream of
the measuring current transformer
Insulation fault upstream of measuring current transformer
Insulation fault downstream of the measuring current transformer
The following residual currents flow through the measuring current transformer of the EDS195P:
The locating current caused by the insulation fault R
The residual currents I
C
, or that are caused by R
E-N
Transient leakage currents that are caused by switching and control activities in the system
Low-frequency leakage currents generated by the use of converters
EDS309x_D00012_03_M_XXEN/11.2014
F-N
that flow through the system leakage capacitances C
Δn
F-V
and R
F-N
E-V
and
17
System description
I
I
I
3.4 Operating principle for residual current measurement (IΔn)
In the RCM mode the EDS309… operates based on the principle of residual current measurement. In
this case only the insulation fault locator EDS195P and a measuring clamp are used, the locating current injector PGH18… is not required.
As per Kirchhoff's law the sum of the currents flowing into any node in a network is equal to the sum
of the currents flowing out.
II
I
EDS195P
ILI
n
ISOSCAN®
ALARM
In
L
I
ESC
INFO
HOLD
OK
MENU
RESET
Abb. 3.1: The two currents Izu and Iab have the same magnitude, however their signs are different,
such that the sum of the two currents is zero. The EDS195P detects this situation, there is no message.
EDS195P
ILI
n
ISOSCAN®
ALARM
In
L
I
ESC
INFO
HOLD
OK
MENU
RESET
Abb. 3.2: Part of the current flows through an insulation fault R
. The sum of the two currents
F
is no longer zero. As soon as the residual current reaches or exceeds the response value
there is an alarm message on the EDS195P.
In the RCM mode it is possible to measure residual currents in single and threephase TT or TN systems. If the system leakage capacitance ahead of the measuring clamp is sufficiently high, the EDS195P can also be used for measurements in
single and three-phase IT systems. The suitability of the device is to be checked in
the specific case.
18
EDS309x_D00012_03_M_XXEN/11.2014
4. Considerations prior to use
PGH18...
EDS195P
PSA...
I
L
4.1 How does the equipment for insulation fault location work
The equipment comprises a locating current injector PGH18… and an insulation fault locator
EDS195P with measuring clamp PSA3… connected.
Functional sequence
Insulation fault location is started by activating the locating current injector PGH18…
The locating current injector PGH18… briefly connects the live conductors to earth with cur-
rent limiting.
The insulation fault creates a closed circuit in which a locating current I
tem voltage flows. The locating current is limited to a maximum value of 25 mA or 10 mA
(PGH185/186), 2.5 mA or 1 mA (PGH183).
The locating current flows from the locating current injector via the live cables, the insulation
fault R
The locating current signal can be measured using measuring clamp placed around the cables
in the outgoing circuit from the distribution system and evaluated by the insulation fault locator EDS195P.
The location of the fault can be determined exactly by moving along the cable with the measur-
ing clamp.
and the earth cable (PE cable) back to the locating current injector.
F
dependent on the sys-
L
EDS309x_D00012_03_M_XXEN/11.2014
Abb. 4.1: EDS operating principle
19
Considerations prior to use
4.2 Requirements for reliable insulation fault location
The insulation fault locator has the task of locating the insulation fault R
uring clamp. For this purpose, it must reliably detect the locating current caused by the insulation
fault.
Requirements:
The insulation fault must be present for at least 30s
The locating current is in the following ranges:
– Main circuits with EDS3090, EDS3090PG, EDS3090PG-13, EDS3092PG,
EDS3096PG-13, EDS3096PV, EDS3096PG: I
– Control circuits with EDS3091, EDS3091PG, EDS3091PG-13, EDS3092PG:: I
The upstream capacitances C
must be at least as large as the downstream capacitances C
E-V
See also chapter "3.3.4 "
The total system leakage capacitance must not exceed the maximum values in the characteris-
tics in chapter "4.4 ".
The sum of the locating current and residual current flowing through the measuring clamp or
the measuring current transformer must not exceed the following values:
– Main circuits with EDS3090, EDS3090PG, EDS3090PG-13, EDS3092PG,
EDS3096PG-13, EDS3096PV, EDS3096PG: maximum 10 A
– Control circuits with EDS3091, EDS3091PG, EDS3091PG-13, EDS3092PG: maximum 1 A
There must be no connections to other outgoing circuits downstream of a measuring clamp or
measuring current transformer, see sketch.
downstream of the meas-
F-N
= 2…50 mA
L
= 0.2…5 mA
L
E-N
.
EDS195P
ILI
n
ISOSCAN®
ALARM
In
L
I
ESC
HOLD
INFO
OK
MENU
RESET
Abb. 4.2: Connections between outgoing circuits will result in measuring errors
As well as the magnitude of the residual current, the frequency of the residual current also
affects the reliable detection of the locating current. Residual currents at frequencies other than
the system frequency may, e.g., be caused by the usage of frequency converters. The behaviour
of the EDS309… is described by the fault curve shown below:
– If the residual currents measured in main circuits exceed 10 A, the EDS195P outputs the
alarm message "I
>10 A".
Δ
n
This statement applies to the system frequencies 50/60/400 Hz for the EDS3090,
EDS3090PG, EDS3090PG-13, EDS3092PG, EDS3096PG-13, EDS3096PV and EDS3096PG.
– If the residual currents measured in control circuits exceed 1 A, the EDS195P outputs the
alarm message "I
>1 A".
Δ
n
This statement applies to the system frequencies 50/60/400 Hz for the EDS3091,
EDS3091PG, EDS3091PG-13 and EDS3092PG.
20
EDS309x_D00012_03_M_XXEN/11.2014
Considerations prior to use
0
1
2
3
4
5
6
7
8
9
10
110100
Permissible residual current [A]
Frequency [Hz]
Frequency range Insulaon fault locaon EDS195P
EDS3090..., EDS3096...
EDS3091...
1
0,9
0,8
0,7
0,6
0,5
0,4
0,3
0,2
0,1
Permissible
Frequency and
Residual current range
Abb. 4.3: Fault curve:
A residual current of 2 A at 10 Hz is outside the permitted
frequency range (red dot) ==> a valid measurement is not possible!
There must be no connections between outgoing circuits downstream of the
measuring clamp because such connections will produce interfering residual
currents. For example, the message "IΔn>10A" may be output as a consequence.
Symmetrical insulation faults downstream of the measuring current transformer will not be detected in certain circumstances. Low frequency residual currents
(e.g. caused by converters) can mean that insulation faults are not found if their
frequency is the same as or approximately the same as the frequency of the locating cycle of the PGH18….
Parallel cables routed to the same load are to be routed together through the
measuring clamp during the measurement.
EDS309x_D00012_03_M_XXEN/11.2014
21
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