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model or ornamental design registration.
Arrester monitor with remote indication
Sensor
Display
Operating manual
Siemens Aktiengesellschaft
All rights reserved.
© Siemens AG • 10/2004
3EX5 060
3EX5 062
Order No.: 928 00033 176b
Contents
Contents ________________________________________________________________________2
General _________________________________________________________________________4
Description
4
Order code for sensor and display
4
Function description
4
Technical data
5
Transport and storage
5
Installation ______________________________________________________________________6
Sensor 3EX5 060
6
Display 3EX5 062
9
Connecting lead
Order code for connecting lead
10
10
Connection to bus systems
11
Operation ______________________________________________________________________12
Reading the surge counter
12
Reading the leakage current measuring device
13
Measurement output
14
Disposal arrester and arrester accessories___________________________________________16
2
© Siemens AG • 10/2004
The manufacturer of this surge arrester
Siemens AG
Power Transmission and Distribution Group
High Voltage Division
has introduced and applies a quality system in accordance with
DIN ISO 9001 / EN 29 001
Quality systems: Model for quality assurance This system was first demonstrated in 1989 to the
DQS (German Association for the Certification of Quality Systems).
The electrical testing laboratories and the materials technology laboratories of the manufacturer
have been certified since 1992 by the German Accreditation Body in accordance with DIN EN 45 001.
If you require further copies of the operating instructions, please order them from the appropriate Siemens office,
indicating the title and order number shown on the title page.
Published by:
In case of request:
Siemens AG
PTD H 4
D-13623 Berlin
Telephone exchange
Sales department:
Fax:
e-mail:
+49 / 30 / 386 1
+49 / 30 / 386 23061
+49 / 30 / 386 26721
mailto:Arrester@Siemens.de
Subject to change.
Note
The equipment covered by these instructions should be installed and serviced only by
competent personnel familiar with good safety practices. This instruction is written for
such personnel and is not intended as a substitute for adequate training an experience in
safe procedures.
This information is intended for the correct installation of this product. Siemens has no control over the condition
of the network, which can be greatly affected by the installation of a product. It is the responsibility of the user to
chose the appropriate method of installation. Under no circumstance is Siemens liable for any direct or indirect
damage caused by the use or misuse of this product.
© Siemens AG • 10/2004
3
General
Description
The 3EX5 06... surge arrester monitor is a monitoring device with a remote indication unit – consisting
of a sensor and a display device – for metal oxide surge arresters in both indoor and outdoor
installations. The sensor is looped into the grounding line of the arrester to be monitored.
The following functions are integrated:
! Via an mA meter, display of the leakage current flowing permanently along the arrester (peak
value measurement)
! Surge counter (electromechanical counter)
! Measurement output for oscillographic display of the arrester leakage current.
The 3EX5 060 sensor basically consists of the pickups for leakage current measurement and the
surge counters which are resin-encapsulated. The resin casting simultaneously serves as the housing.
The 3EX6 062 display unit contains the leakage current display (mA meter) and the surge counter.
They are accommodated in a stainless steel enclosure with a front panel made of glass to allow them
to be read. A socket is provided at the rear of the enclosure (measurement output). The sensor is
connected to the display unit via a special multicore screened cable (included) measuring no more
than 200 m.
Order code for sensor and display
Type
3EX5 060
3EX5 062
Description
Sensor
Display
Remarks
For display 3EX5 062
With measuring socket
Function description
3EX5 060
1
2
3
4
5
Toroidal core transformer
Protective spark gap
Resistor
Primary conductor
Evaluation electronics
Fig. 1.
Block diagram
3EX5 062
6
Connecting lead
7
8
9
Leakage current display
Leakage current measuring
socket e.g. for osciloscope
(Amphenol C16-1)
Counter
Under normal operation the arrester leakage current flows to ground via the primary conductor and the
resistor. The evaluation circuitry displays its peak value on the leakage current measurement unit.
When the arrester operates, the discharge current sent along the primary conductor induces an
impulse voltage in the secondary winding which in turn increments the counter one step. Depending
on the measurement principle used, the sensitivity of response of the counter will depend on the
virtual steepness and the duration of the discharge current.
4
© Siemens AG • 10/2004
At the resistor the discharge current causes such a large drop in voltage that the protective spark gap
responds. The voltage drop which occurs by this time does in fact take place before the peak in the
arrester discharge voltage and thus does not affect its magnitude. The voltage drop then falls to
negligibly low values.
Technical data
!
!
!
!
!
!
Leakage current display (3EX5 062):
mA meter with non-linear scale
Surge counter (3EX5 062):
Sensitivity
Current waveform 4/10 µs, 8/20 µs
Currenmt waveform 30/60 µs
Current waveform, rectangular wave discharge current
Measurement output for e.g. oscilloscope (3EX5 062 :1 :2):
Transformation ratio
.
Measurement output for peak value measurement
3EX5 060(:4 :E)
Switching contact (NC)
3EX5 060 (:5 :6)
.
Ambient temperature
0 mA … 20 mA ± 20 %
1000 A
200 A
100 A
470 mV/mA.
Rein ≥ 1 MΩ
On request
Switching voltage: 250 V AC/DC
Switching current: 1 A
Switching capacity: DC 30 W / AC 60 VA
Bounce time: approx. 1 ms
Contact time: 20 … 200 ms
-35 … +60 °C
Transport and storage
The operation indicators are supplied packed in cardboard boxes. They must be unpacked if they are
to be stored in humid conditions (such as in the tropics, for example).
© Siemens AG • 10/2004
5
Installation
Warning
Before any work starts:
! switch off and isolate
! secure against reclosing
! verify that equipment is dead
! earth and short circuit the equipment
! cover or fence off nearby live parts
Death, severe injury and considerable damage to
property and environmental damage may result if
the safety instructions are not followed.
!
Confirm that these safety measures have been carried out.
Sensor 3EX5 060
It is absolutely essential (for the proper functioning of the sensor) for the arrester to be installed on
insulating mountings. The sensor is installed on the ground connection of the arrester. Be sure not to
exceed the permitted tightening torques for the screws:
!
Mmax = 30 Nm ± 1 Nm.
The ground connection of the sensor is connected to system ground - the metal frame of the arrester,
for example. A copper wire 35 mm² in cross-section and not longer than 2 m is recommended for this
purpose. The sensor is connected to the display by means of a special lead (see Fig. 7.).
When installing this lead make sure that there is adequate clearance to live parts (at least 30 mm).
Fig. 2.
6
Installation 3EX5 060
© Siemens AG • 10/2004
Fig. 3.
View from below
If the 3EX5 060 sensor is installed in series with a tell-tale spark gap (a 3EX6 040, for example) the
sequence of the devices is important:
Connection for monitoring devices " Tell-tale spark gap " Sensor " System ground (e.g. tower base)
Fig. 4.
Installation sequence for outdoor arresters
© Siemens AG • 10/2004
7
1
2
3
4
5
Fig. 5.
a
Enclosure bushing for connecting monitoring devices
Post insulators for insulated installation of tell-tale spark gap
Tell-tale spark gap 3EX6 040
Operation sensor 3EX5 060
System ground
b
a: Installation sequence for encapsulated arresters without a tell-tale spark gap
b: Installation sequence for encapsulated arresters with a 3EX6 040 tell-tale spark gap
Note
The wiring run between the connection for monitoring devices and the ground connection
should be kept as short as possible.
8
© Siemens AG • 10/2004
Display 3EX5 062
The display can be installed at distances of up to 200 m (maximum length of connecting lead). Greater
distances are however possible on request. The display is connected to the sensor by means of a
special lead. The display enclosure must be installed so that it is grounded effectively. Be sure not to
exceed the permitted tightening torques for the screws:
!
Mmax = 30 Nm ± 1 Nm.
Fig. 6.
Installation of 3EX5 062
Warning
To ensure proper shock-hazard protection the housing of the
3EX5 062 display must be grounded effectively.
© Siemens AG • 10/2004
9
Connecting lead
Fig. 7.
Connecting lead between sensor and display
Ready-assembled connecting leads are available. If so required, you can also make up the leads
yourself. For each lead you will need a plug and an angle socket, C16 series, six-pole, manufactured
by Amphenol. The plugs and sockets can also be ordered as pairs from Siemens.
Order code for connecting lead
Type
3EX5 960-0
3EX5 963-0D
3EX5 963-0G
3EX5 963-1A
3EX5 963-1C
3EX5 963-1E
3EX5 963-1G
3EX5 963-1J
3EX5 963-2A
3EX5 963-2C
3EX5 963-2E
3EX5 963-2G
3EX5 963-2J
3EX5 963--3A
Description
Plug and socket for connecting lead
Connecting lead, 3 m
Connecting lead, 6 m
Connecting lead, 10 m
Connecting lead, 12 m
Connecting lead, 14 m
Connecting lead, 16 m
Connecting lead, 18 m
Connecting lead, 20 m
Connecting lead, 22 m
Connecting lead, 24 m
Connecting lead, 26 m
Connecting lead, 28 m
Connecting lead, 30 m
Remarks
For customer assembly
Pre-assembled
Pre-assembled
Pre-assembled
Pre-assembled
Pre-assembled
Pre-assembled
Pre-assembled
Pre-assembled
Pre-assembled
Pre-assembled
Pre-assembled
Pre-assembled
Pre-assembled
The following is used as lead: PVC-C-LIYCY, 3×2×0.25 mm².
The connection between the plug and socket is shown in the following diagram:
Fig. 8.
10
Connecting lead diagram
© Siemens AG • 10/2004
Connection to bus systems
The outputs of the 3EX5 060 sensor can be connected to the interface cards of the bus systems
directly or via commercially available transformers (4 - 20 mA current loop, for example) (Rin ≥ 1 MΩ).
In the event of arrester operation, an internal protective circuit in the measurement outputs limits the
voltage pulse which occurs to a value of ûimp ≤ 350 V.
Warning
Due to the voltage surges which can occur during arrester operation
you should ensure that adequate suppressor circuitry is installed in
the inputs of transformers or interface cards.
© Siemens AG • 10/2004
11
Operation
Use of the measurement output and reading the leakage current measurement device is only possible
when the system is in operation - in other words, when the system is not isolated.
Warning
Non-compliance of safety hints can course death or serious injures.
Always maintain a safe distance from live parts!
Use binoculars for reading measuring instruments and indicators, if
necessary.
Reading the surge counter
Fig. 9.
Surge counter
The surge counter displays surge arrester operation events which occur when threshold values are
exceeded.
Note
Due to routine inspection and testing having been carried out, the arrester monitor will
already display a value greater than 0 when shipped.
12
© Siemens AG • 10/2004
Reading the leakage current measuring device
Fig. 10.
Leakage current measuring device
Under normal circumstances the pointer deflection should not exceed 2/3 of the range on the scale. If
the pointer is in the range marked ‘>20’, measurement should be repeated at a later time since the
leakage current through the arrester could be falsified by foreign conductive deposits on the surface of
the arrester housing. In the same way, increased leakage currents can occur immediately after a
reading due to a temperature increase in the active part of the arrester; this problem would not
however occur with shorter periods of time.
If measurements subsequently repeated still yield the same results, you should contact the
manufacturer of the arrester.
© Siemens AG • 10/2004
13
Measurement output
Fig. 11.
Measurement output
The rear of the display unit is provided with a C16-1 socket (Amphenol) as a measurement output for
the leakage current time curve. The transformation ratio at the measurement output is ü = 470 mV/mA.
The input resistance of the connected measuring device (an oscilloscope, for example) must have a
value of Rin ≥ 1 MΩ. In the event of arrester operation, an internal protective circuit in the
measurement outputs limits the voltage pulse which occurs to a value of ûimp ≤ 350 V.
When the system is not in use, the cover cap must be replaced to protect the socket from
environmental influences. The cap is permanently attached to the socket by a plastic chain.
As a simple way of connecting an oscilloscope, a special lead (order no.: 3EX5 961-2) for connecting
the measurement output and the oscilloscope is available (not included in the scope of supply).
14
© Siemens AG • 10/2004
.
Fig. 12.
Lead 3EX5 961-2 for connecting measurement output and oscilloscope
© Siemens AG • 10/2004
15
Disposal arrester and arrester accessories
Surge arresters and the accessories are an environmentally compatible product. In disposal, priority
must be given to reuse of the materials. Environmentally acceptable disposal of the surge arresters
and the accessories is possible in line with current legislation.
The following materials have been used to make up the device: Steel, copper, aluminium, PTFE, cast
resin or cast-resin-impregnated fabric, glass-fibre-reinforced plastics, polyurethane, rubbers for
sealing, ceramics, electronic components and silicon rubber (VMQ), ceramics (porcelain, metal oxide).
The device can be recycled as mixed scrap, or, if it is dismantled as far as possible, in a more
environmentally acceptable way as sorted scrap with a mixed-scrap residual portion. The arrester
resistors of metal oxide (MO) should be disposed of as industrial waste similar to domestic garbage
(not as building rubble).
In as-supplied-by-Siemens state, the device incorporates no hazardous substances in the sense of the
pertinent regulations in Germany. If the device is to be operated outside Germany, the locally
applicable laws and regulations must be followed.
Local customer support offices will be able to answer any questions concerning disposal.
01.10.2004 10:01
16
© Siemens AG • 10/2004