Manual SF6-Breaker-Analyser HF 100819

A Division of WIKA of WIKA SF6 Center of Excellence

Manual SF6-Breaker-Analyser Version 2.0

SF6-Breaker-Analyser

©

WIKA Alexander Wiegand SE & Co. Co. KG Otto-Hahn-Straße 15 44227 Dortmund, Germany Phone: +49 231 / 97 42 - 65 66 Fax: +49 231 / 97 42 - 65 55 E-Mail: [email protected] Internet: www.gas-dortmund.de

18.8.2010

2


©

WIKA Alexander Wiegand SE & Co. Co. KG Otto-Hahn-Straße 15 44227 Dortmund, Germany Phone: +49 231 / 97 42 - 65 66 Fax: +49 231 / 97 42 - 65 55 E-Mail: [email protected] Internet: www.gas-dortmund.de

18.8.2010

2


1 General Information

5

1.1

Information about the Manual

5

1.2

Explanation Explanation of Symbols

5

1.3

Scope of Supply

6

1.4

Liability and Guarantee

7

1.5

Copyright

8

1.6

Return and Disposal

8

1.7

Customer Service

8

2 Transport, Packing and Storage

9

2.1

Inspection after Transport

9

2.2

Transport

9

2.3

Packing

9

2.4

Storage

9

3 Cleaning and Maintenance

10

3.1

Cleaning

10

3.2

Maintenance

10

3.3

Calibration

10

4 Security

11

4.1

Intended Use

11

4.2

Responsibility Responsibility of the Operator

11

4.3

Requirements Requirement s of the Personnel

12

4.4

Dangers

13

5 Introduction

14

5.1

Operation mode of the SO2- and HF-sensor

15

5.2

Operation mode of the percentage sensor

16

5.3

Operation mode of the moisture sensor

17

5.4

Gas flow diagram

18

5.5

5.4.1


18

5.4.2

SO2- and SO2 /HF-module

19

SF6 application and environmental aspects

19

3


6 System Operation

20

6.1

Loading of Battery

20

6.2

Description of the measuring process

21

6.3

Insertion of the SO2 or SO2 /HF-module

24

6.4

Measurement

26

6.5

Purging of the SO2 or SO2 /HF-module

29

6.6

Data

30

6.7

Settings

31

6.8

Shut down

35

7 Exchange of modules

36

8 Fault correction

38

9 SF6-recovery -recover y bags / recovery systems

38

10 Technical Data

40

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1 General Information 1.1 Information about the Manual This manual describes a safe and adequate handling of the SF 6-Breaker-Analyser. Following the instructions of the indicated safety aspects and instructions as well as the national and/or local rules and general safety regulations concerning the prevention of accidents are absolutely imperative. Before starting the work with the device read the manual completely and thoroughly particularly the chapter security and respective safety references. Assure that you/the operator comprehend the terms described. The manual is part of the device. It has to be stored together with and next to the device at any time.

1.2 Explanation of Symbols Important and safety-relevant references in this manual are characterized by symbols. These indications which are in-line with industrial safety must be respected and followed at any time. Information! This symbol calls information, which are to be considered for efficient and perfect handling of the equipment. NOTE! Danger for real values! This

symbol

indicates

references,

which

can

lead

to

damages,

malfunctioning and/or loss of the device. WARNING! Danger by electric current! This symbol marks references, which can lead to health impairments, injuries, lasting body damages or to death due to electric current. VERY DANGEROUS! Injury or mortal danger! This symbol marks references, which can lead to health impairments, injuries, lasting body damage or to death.

5


1.3 Scope of Supply Assure that you have received the full scope of supply. If there is any part missing, please contact the WIKA-hotline immediately. The scope of supply consists of: •


•

Transport case

•

Battery charger

•

Instrument’s quality test report

•

4 m long PTFE connecting hose with wire coating, self-closing stainless steel couplings on both ends

•

Hose connection M20x1.5 (for Coupling DN8)

•

Hose connection M45x2 (for Coupling DN20)

•

Coupling DN 20

•

Coupling DN 8

•

2 m long interface cable RS 232

•

USB adapter / serial 9 poles with CD-ROM (software driver)

•

CD-ROM with SF6-Reviewer software and user manual

•

Operating instructions of the SF6-Breaker-Analyser with CD-ROM

•

Battery-module (inserted)

•

SF6-%-module (inserted)

•

Moisture-module (inserted)

•

SO2-module separately (inserted, not connected)

Accessories available as an option •

SF6 –Recovery –Kit (short-term storage of the measuring gas)

•

SF6-MV-Pressure-Regulator (Device for using the SF 6-Breaker-Analyser at SF6filled compartments with less than 0.5 bar overpressure)

6


1.4 Liability and Guarantee All data and reference within this manual are compiled under the valid regulations, the stateof-the-art as well as WIKA experiences of several years. The manual has to be stored together with and close to the device at any time and accessible to all persons, who work with it. This manual must be read carefully before starting to work with the equipment! WIKA does not overtake any liability for damage and disturbances, resulting from neglect or ignorance of the manual’s instruction. The text and graphics do not correspond necessarily to the scope of supply. The figures and/or diagrams do not correspond to the yardstick 1:1. The actual scope of supply might deviate from special (customized) equipments, the recourse of additional order options or due to newest technical changes concerning the data and references described herein as well as the graphic representations. For questions please contact the WIKA -hotline. WIKA reserves the right to realize technical changes of the product due to improvements without explicitly mentioning them.

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1.5 Copyright The manual is confidential. It is beyond doubt exclusively made and also meant for the personnel directly dealing with the equipment. All data, texts, designs, pictures and other representations within this manual are protected in the sense of the copyright law and are subject to further commercial patent rights. Each abuse is liable to prosecution. Passing it on to third persons as well as duplications in any kind and form - also in part - as well as the use and/or report of contents are not permitted without written agreement of the manufacturer. Offences lead to payment of damages. We reserve ourselves the right for further legal actions as well as all further rights according to the practice of commercial patent rights.

1.6 Return and Disposal For a professional redemption, the device or/and its equipment must be returned to the manufacturer or to a third party authorized by the manufacturer!

1.7 Customer Service For questions concerning the equipment a customer service is available: -

Phone:

++49 231 / 97 42 - 65 66

-

Fax:

++49 231 / 97 42 - 65 55

-

E-Mail:

[email protected]

The telephone hotline is attainable from Monday to Friday from 8:00 to 17:00 hours. In urgent cases and if you use fax or email, please indicate your telephone number.

WIKA Alexander Wiegand SE & Co. KG Otto-Hahn-Straße 15 44227 Dortmund http://www.gas-dortmund.de

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2 Transport, Packing and Storage 2.1 Inspection after Transport Check the supply immediately after delivery concerning its completeness and/or transport damages. If you detect outwardly recognizable transport damage, do not receive the supply, or only under reservation. State the extent of the damage on the provided delivery note and/or the transportation documents of the feeder. Generate a complaint. Lodge a complaint of covered defect immediately after recognizing, as claims due to transport damages can only be made valid within the complaint periods (usually 7 days).

2.2 Transport The equipment should be moved only within the provided carrying case. By this means, transport damages can be avoided.

2.3 Packing If no redemption agreement concerning the packing was agreed upon, separate the different materials according to kind and size and supply it to further use or recycling. Information! Dispose the packing material always environmentally friendly and according to the valid local regulations. If necessary, ask a recycling company.

2.4 Storage Store the device only under the following conditions: Until the use of the equipment keep the

•

Protect the device against sun exposure

provided suit-case locked

•

Storage temperature: -10 to 60 °C

•

Do not store unsecured

•

If you do not use the device, check the

•

Do not store outside

•

Store only dry and dust free

•

Avoid mechanical vibrations

•

Do not expose the device to aggressive

•

storage condition, regularly •

Protect against unauthorized access

media

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3 Cleaning and Maintenance Natural aging and the wear of certain components of the equipment require a regular cleaning and maintenance.

3.1 Cleaning Clean the device only with a dry or easily damp cloth. NOTE! Danger for real values! Do not use cleaning agents, which contain solvents, acids or bases.

3.2 Maintenance Maintenance of the device should only be carried out at WIKA or through specially trained and by WIKA authorized personnel.

3.3 Calibration The SF6-Breaker-Analyser has to be calibrated and inspected concerning its functions every two years. To calibrate the device or single modules it has to be sent back to the WIKA or realized through specially trained WIKA authorized personnel. In case of a sensor breakdown or defect as well as for the calibration or when reaching the end of lifetime (2 years for SO2- and SO2 /HF-module), each module can be removed independently from the others. When turning on the SF 6-Breaker-Analyser, the system check will recognize the missing module(s).

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4 Security This section gives an overview of all important safety aspects for an optimal protection of the personnel as well as for the safe and trouble free use of the device. Additionally, the individual chapters contain concrete safety references with respect to the prevention of direct dangers which are indicated by symbols.

4.1 Intended Use The device may not be operated by introducing aggressive gases or liquids! The working reliability is only ensured when the equipment is applied for its purpose: To measure the moisture, the SF 6-concentration and the SO2 / HF - concentration in SF6 or other non aggressive gases within the specified ranges! NOTE! Danger for real values! Each use of the device, that differs from the intended use is forbidden and will be regarded as “out of purpose”. All claims or requirements of any kind against the manufacturer and/or its authorized persons that arise due to damages from a not intended use of the device will be rejected. All damages that arise from a not intended use are of the operator’s responsibility. The intended use of the equipment and its correct handling according are described in the operating instructions of this manual. Other parts than the parts belonging to the scope of supply, may only be used after G.A.S.’ approval.

4.2 Responsibility of the Operator This manual must be kept in direct access and together with the device and accessible to the operating staff at any time. The hints, information and instructions are to be followed without any restrictions or reservation! Besides the indicated safety references and instructions in this manual, the local rules for the prevention of accidents and the general safety regulations - valid for the area of application of the device - as well as the valid environmental-protection regulations are to be considered and respected.

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The technical responsible as well as the operator should take care of a trouble free use of the device as well as of clear definitions of the competences during operation, maintenance and cleaning.

4.3 Requirements of Personnel Only authorized and trained technical personnel may work with the instruments. The operator must have received an instruction over existing and all possible dangers and should be regularly instructed in safety procedures and environmental protection and that this personnel is fully aware of the complete operating instructions and particularly the safety notes. This personnel should Personnel that might be under the influence of drugs or alcohol are to be kept off the device at any time. Technical personnel in this context are defined as skilled employees who are knowledgeable due to their educational background. In case the foreseen personnel do not have the necessary qualifications to operate the instrument, it must be trained. Further to that nonauthorized personnel should not operate the device. The competencies for the work on and with the device must be specified and kept undoubtedly at any time so that with respect to security issues no unclear situation might come up. Any changes of the equipment, which impair security of the personnel must immediately be reported to the operator and every person dealing with it.

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4.4 Dangers The equipment was subject to an endangerment analysis. The construction and execution of the device corresponds to the today's state-of-the-art. The device is reliable in service when operated according to its intended use. VERY DANGEROUS! Injury or mortal danger! The equipment is not certified for the employment in areas with explosive gas air mixtures (zone 0). The maximum inlet pressure of the device must not exceed 14 bar absolute. Introducing a higher pressure into the device leads to damages of it. For safety reasons the SF 6-BreakerAnalyser automatically monitors the outlet pressure and in case of an overpressure (due to a full recycling system or sampling bag) closes the gas inlet and the measurement is aborted

NOTE! Danger for real values! The internal inlet valve only opens when executing a measurement. In case of an overpressure at the gas outlet the measurement is aborted and the gas inlet valve automatically closed to prevent further damages..

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5 Introduction The SF6-Breaker-Analyser is a modular device to check moisture, decomposition (SO 2 solely or both SO2 and HF) and purity of SF6. The base unit contains a computer board for data acquisition and storage, and all necessary hardware to make a physical connection to gas insulated equipment. Users can purchase test cards for specific contaminants. The device will function with one, two or all three cards. Features: • Compact, lightweight • Highly sensitive • Low maintenance • Automatically validates readings • Cost-effective • Fast test results, typically 7 minutes total • Integrated data acquisition and storage • Modular upgrades • No consumables • Battery power (8 hours)

With all three cards installed, the operator simply makes a connection to equipment being tested, and with the push of a button, will receive test values for moisture, decomposition and purity. The test values are internally compared to the CIGRE B3.02.01 or IEC standard for SF6 contamination or reuse (or customer defined value), and a pass/fail indicator will illuminate on the analyzer. All tests values will be stored on internal flash memory – which can later be downloaded to a PC. Because of the modular approach, the user may opt to initially purchase only one card, and as funding becomes available, purchase the

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additional two cards later. When a card needs calibration, the entire device does not need to be returned – simply exchange the card and avoid any downtime.

Information! The SO2 and HF sensor have a lifetime of two years. Using the sensors for more than two years is not recommended as it might cause imprecise readings due to <2% per month of signal degradation.

Information! For the operation with SF6-CF4 mixtures (or other) the SF6-Percentage sensor needs a different calibration. In this case contact the manufacturer for further information.

5.1 Operation mode of the SO2 and HF sensor SO2 sensor The applied electro-chemical sensor incorporates a gold based, three electrodes and acid electrolyte system. The introduced SF6 diffuses into the SO2 -sensor. Here it reacts at the sensing electrode through an oxidative process, according to the following equation: Equation 1: Sensing process: Sulphur Dioxide

(SO 2): SO2 + 2H2O = H2SO4 + 2H+ + 2e-

The Counter electrode acts to balance the reaction at the sensing electrode, by means of an oxygen reduction forming water as a consequence. Equation 2: Counter reaction: Oxygen Reduction:

1/2O2 + 2H+ + 2e- = H2O

15


The two equations represent the overall cell reaction as follows: SO2 + ½ O2 + H2O = H2SO4 In case of a SO 2 presence within the SF 6 under inspection, equation 1 changes its electrochemical potential and electrons are released consecutively. Thus a change of currency is detected and converted to ppm v-values via a micro processor. The applied sensor carries a transmitter board that includes temperature compensation and a calibration in the specified range.

HF sensor In an HF sensor, HF reacts with the electrolyte in the form of an electro-catalytic reduction that produces a pH change in the electrolyte. This change results in a potential change at the sensor's electrodes, which is converted into a concentration value (ppm v values) by means of an electronic evaluation mechanism.

5.2 Operation mode of the percentage sensor The measuring principle is based on the evaluation of different velocities of sound of gases. The velocity of sound in the air is about 330 m/s, while it is only about 130 m/s in pure SF 6 atmosphere. The velocity of sound measured in the measuring cell is temperaturecompensated and converted into SF 6-volume content by using a microprocessor. The measuring results are transmitted to the central processor.

16


5.3 Operation mode of the moisture sensor The moisture sensor is based on the absorption of water molecules in a special ceramic material. Only vapour penetrates the covering electrode by diffusion and agglomerate reversibly to the polymer. Therefore, the capacity of the sensor changes, which is registered by the evaluation electronics and is converted into a standard signal. This signal is transmitted to the central processor.

Ca acitive ol mere Cover electrode

Deckelelektrode

(vapour permeable (dampfdurchlässig)

Polymere Polymer Contact spot

Kontaktstelle (Cover electrode – connection area – wire)

(Deckelelektrode – Anschlussfläche – Draht)

Ground electrode

+ Grundelektrode Contact area + Kontaktfläche (Ground electrode – connection area – wire

(Grundelektrode – Anschlussfläche – Draht)

Base Trägermaterial

(%r.F.) CC== ff(%RH) CCtotal = C0 + C%RH ges = C0 + C%r.F.

Schematic Diagram of the moisture sensor

17


5.4 Gas flow diagram 5.4.1 SF6-Breaker-Analyser

Pos. 1 3 4 5 6 7 8 9 10 11 12 13 14 15

18

Designation Coupling NW 5 Solenoid valve Pressure sensor 200 psi abs. Pressure regulator Coupling piece 1/8“ inside thread Orifice plate Coupling 1/8“ inside thread Coupling piece 1/8“ inside thread Orifice plate Coupling 1/8“ inside thread Coupling piece 1/8“ inside thread Orifice plate Coupling 1/8“ inside thread Pressure sensor 100 psi abs. Pressure sensor 15 psi Coupling Rinsing switch


5.4.2 SO2 - and SO2/HF - module

5.5 SF6 application and environmental aspects Since 1900, when SF6 was synthesized for the first time by Moissan and Lebeau, its industrial applications have gradually increased. The remarkable gas inertness and the chemical and dielectric properties caused the General Electric Company in 1937 to suggest its use in electrical equipment. The large-scale employment of SF6 in electrical manufacturing started around 1960 in the U.S.A. and Europe. In that year the first use of SF6 in circuit breakers and switches for high and very high voltages was reported. So far there is currently no suitable substitute for SF6 as an arc suppressant in high and medium voltage electrical switchgear. To protect the environment it is important to reduce the SF6 emissions, because SF6 is a gas with a global warming potential 22,200 times greater than CO2 and an atmospheric life time of 3,200 years. Thus SF6 is a potent greenhouse gas. Further SF6 is one of the 6 named gases in the Kyoto Protocol giving reduction targets for 2008 –2012 and beyond that. Using the SF6-Breaker-Analyser the use of appropriate recovery bags and systems are recommended to ensure a closed loop and to avoid any SF6-Emissions. Information! Never close the gas outlet while the device is being operated. Otherwise the measuring process is aborted.

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6 System Operation 6.1 Loading of Battery The SF6-Breaker-Analyser is equipped with a 5,2 Ah Lithium-Ion battery which allows to operate the device for approximately 8 hours. Internal monitoring of the battery voltage gives a battery warning message if the battery it is low. If not recharged, the system consecutively executes an automatic shutdown to avoid any damages.

To recharge the battery: 1. Turn off the SF6-Breaker-Analyser. 2. Connect the power plug connector of the delivered battery charger to the power socket. 3. Plug the instrument’s connector into the socket on the back plane (see picture).

4. Wait until the red charge lamp of the battery charger is extinguished. The battery is charged with a charge current of 2,2 A and a voltage of 16,8V. The maximum charge time of an empty battery is approx. 2,5 hours. 5. Disconnect the plug-ins. 6. The SF6-Breaker-Analyser is again ready for measuring.

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6.2

Description of the measuring process

Fig 6.01 Before starting measuring the transport protection of the SO 2-Module (or SO2 /HF-Module) has to be removed and the module has to be inserted (See chapter 6.3). As soon as the device is switched on, the start screen appears (ill. 6.02). After a short initialization time the component check follows. The correct function of each component is confirmed or indicated by the “

“-mark. (fig. 6.03). If a SO2 module or a SO 2 /HF-Module has been inserted is

indicated by a frame (fig. 6.03, a SO 2 /HF-Module is inserted). In case a component is not ready for operation or not inserted (correctly) it is indicated by a cross on the display. At the end of the successful initialization process, the base menu (fig. 6.04) turns up. All functions of the SF6-Breaker-Analyser are accessible through this menu.

Fig. 6.02

Fig. 6.03

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The menu items described under illustration 6.04 can be selected as follows:

Fig. 6.04

Measurement:

•

In this menu item the measuring process can be started. (see chapter 6.4) Flushing:

•

In this menu item the flushing of the SO 2-module (or SO2 /HF-Module) with ambient air after measuring a concentration of SO2 and/or HF (SO2 /HF-Module) can be carried out. (see chapter 6.5). Data:

•

This menu item indicates the stored data, which can be deleted and transmitted to a connected computer. See chapter 6.6 and the manual of the SF6-Reviewer software. Settings:

•

This menu item allows to change the settings of the device and parameters of the measurement (see chapter 6.7 “Settings“) According to the hardware configuration of the device it is possible that not all sensor values are available, which is indicated by the “---“ mark for the missing sensor(s). The status bar, which shows the date, the lifetime counter for the SO2 sensor (and for the HF–sensor too in case of the SO2 /HF-module) called “SO2-life” and the temperature as well as messages on the status bar of the different processes, is permanently visible on the bottom line of the screen. Information! As the SO2 sensor (and the HF-Sensor in the SO2 /HF-module) has a recommended lifetime of two years the ”SO2-life” counts up the lifetime of the installed SO2 module / sensor (or SO2 /HF-module) in daily steps. Approaching the 2 years lifetime (or 730 days) the device gives a message 60 days before.

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The SF6-Breaker-Analyser is steered via the turning knob on the right side (see ill. 6.01). It is possible to select the desired menu item by turning and to select the control elements by pressing the control elements, which will start the function.

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6.3 Insertion of the SO2-module or SO2/HF-module The SO2-module (or SO 2 /HF-module) is delivered inside the SF6-Breaker-Analyser, but electronically and with respect to the gas not connected. It is delivered with a transport protection. Before turning on the SF 6-Breaker-Analyser remove the two stickers and the rubber foam of the transport protection (blue arrows in figure 6.05). Insert the module and fix the 4 screws of the module (red rings in figure 6.05).

Fig. 6.05 Open the front panel by loosening the screws marked in picture 6.06 and realize the gas connection of the module by plugging the green marked quick connectors onto the SO 2module’s (or SO2 /HF-Module’s) adaptors (see picture 6.07).

Fig. 6.06

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Fig. 6.07


Shut the front panel again and fix the 2 screws. After switching-on the SF6-Breaker-Analyser, the device recognizes a newly calibrated SO 2-module or SO2 /HF-module and the lifetime counter of the module is automatically initialised and reset. Its activation is confirmed in the status bar (see figure 6.08).

Fig. 6.08 Activation of lifetime counter

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6.4 Measurement Connect the SF6-Breaker-Analyser to the gas compartment to be tested using the 4 m long hose and the corresponding couplings. Assure that the gas outlet on the back plane is not covered or closed or that it is properly connected to a recycling system (see chapter 10) or recovery bag (available at G.A.S., SF6-Recycling-Kit, TEDDLAR, LINDE, etc.).

Procedure:

Fig. 6.09

Fig. 6.10

1. To carry out a measurement, click on “Measurement“ in the corresponding “Measurement” submenu (see fig. 6.04). The test time of the SF6 gas can be defined by the operator or turned off under the menu point “Settings” (see chapter 6.7). Recommended test time of the SF6-Breaker-Analyser is typically 7 minutes. Turning off a defined test time allows the operator to save the displayed sensor values at any time. After starting “Measurement” and assuring a gas flow, it is recommended to rinse the 4 m long hose immediately by pressing the rinsing knob (purge) at the front panel of the device in order to shorten the subsequent measurement time. Pressing the purge knob for approximately 2 to 3 seconds is sufficient to flush out the gas inside the hose. 2. Firstly the “Measurement preliminary” dialog with important pre-requisites for a measurement (fig. 6.09) turns up. All 3 points have to be fulfilled/ carried out before starting a measurement. This implies that a leakage free hose connection between the gas filled compartment and the device has been realized. The maximum inlet pressure of the SF6-Breaker-Analyser is 14 bar absolute (ambient plus compartment). The inlet pressure is indicated in absolute pressure as default.

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3. After initializing the measurement process by confirming the dialog (see 6.09), the test runs automatically and lasts (according to the instrument’s settings, see chapter 6.7) some minutes (7 minutes default). During the measurement all sensor values and their changes are displayed permanently (fig. 6.10). If the values of the three are better than the set criteria with respect to a possible contamination the operator can terminate the measurement by executing the “skip” button and display the current values of the measurement. The final result is displayed at the end of the measurement (fig. 6.11). The indicated values are: SF 6-percentage, moisture, SO2concentration and in case of a SO 2 /HF-module, HF too. Further to that the inlet pressure, the date and time of acquisition as well as the result are shown on the left side of the screen.

Fig. 6.11

Information! All implemented sensors are temperature compensated. All sensors work at atmospheric pressure (1bar). This should particularly be taken into account concerning the dew point, which displays dew point values over ice.

Visual data interpretation through the installed LEDs on the front panel:

•

“Ok“: The values of the SO2-concentration, the moisture and the SF 6percentage are within the set tolerance (see settings, green LED lights up and all sensor values on the screen are marked with a confirmation “

•

“).

“Contaminated“: The SO2-concentration and / or one of the values for the moisture and the SF 6-percentage exceed the set tolerance (see settings, red LED lights up, the sensor(s) is / are marked with a twinkling cross).

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•

“Undefined“: The quality of the measuring data is very bad so that a corresponding evaluation is not possible (red LED lights up).

Information! The value of the HF is not related to the visual data interpretation (for the SO2 /HF-module), only SO2 value. Until today no limit for HF is given by any authorisation body.

1. In case “Close” is confirmed the acquired data can be stored in the device. 2. If the user stores the data by clicking “Close”, the dialog “Set measurement name” appears. The user is requested to generate a name for the measurement (fig. 6.12). The length of the name is limited to 16 digits (letters or symbols). There is no guideline for the name. Alternatively and to shorten this process, one of the last five names can be used and modified by selecting them by the use of “ ”-symbol.

Fig. 6.12

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6.5 Purging of the SO2-module or SO2/HF-module

Fig. 6.13 After measuring a SF6 sample with a SO2 concentration above zero and/or a HF concentration above zero in case of the SO 2 /HF-module inserted the SO2-sensor and the HF (in case of the SO2 /HF-module) have to be purged with ambient air to clean and reset the value(s) to 0. Therefore leave the SF 6-Breaker-Analyser turned on and execute “Flushing” in the main menu (fig. 6.04). The pump inside the SO 2-module / SO2 /HF-module starts rinsing ambient air through the SO 2-sensor or through the SO 2-sensor and HF-sensor. This process should not be stopped until the value(s) have reached 0 ppmv again in order to secure a precise reading for the next measurement. The pumping process can be stopped or aborted by pressing “Close” by the operator. The SF 6-Breaker-Analyser is again ready for operation.

Information!

To secure a longer lifetime and a correct reading the SO 2-sensor and the HF-sensor (in case of the SO2/HF-Module) has to be purged each time a SO2-concentration of > 0 ppmv and a HFconcentration of > 0 ppmv is measured.

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6.6 Data The submenu “Data“ (fig 6.14), which is reached from the main menu allows to look at stored data (fig. 6.11 and 6.15). Under “Show measurement” the stored data of each measurement can be chosen (fig 6.15). The selected measurement is displayed with all its details (fig.6.11). Measurements can be deleted from the memory by selecting “Delete Measurements“. Information! Please note that only all measurements can be deleted from the internal memory, not single or selected ones. The last menu item “Export measurements” starts the “SF 6-Reviewer“-mode (fig 6.16), which allows the download of stored data from the compact flash card of SF6-Breaker-Analyser to a connected PC (for this purpose see the user manual of the SF 6-Reviewer).

Fig. 6.14

Fig. 6.16

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Fig. 6.15


6.7 Settings Some specific settings are selectable in the “Settings“ menu (fig. 6.17). The adjustable values are categorized in “Acquisition“, “Date / Time”, “Sensors” and “Device”.

Fig. 6.17

Fig. 6.18

Fig. 6.19

Acquisition (Settings/Acquisition) (fig.6.17) Concerning the determination of SF 6 test values and to operate the SF6-Breaker-Analyser in a correct way, the following points are very important:

•

Duration: The test time can be adjusted or turned off. When operating the SF 6Breaker-Analyser with all sensors, the recommended test time is 7 minutes, as the typical T90 duration for the moisture sensor to measure a dry sample (-45 °C to -55°C) takes this time. Turning off the test time (by using the steering knob) allows to save the acquired and displayed values at any time.

•

Limits: (Data acquisition / Limits) (fig. 6.19) The set values determine how the SF 6 –Breaker-Analyser interprets the measuring result. In case the SF6 gas under inspection does not fulfil to the following criteria, the SF6-Breaker-Analyser shows the result of a contaminated gas:

31


o

Min. SF6-%-value: The content of SF6 –purity is below the set limit.

o

Maximum dew point: The humidity content (dew point) exceeds the set value.

o

Max. decomp. prod.: The SO2-concentration within the SF6 is exceeded.

The max. tolerable values, recommended in the SF 6 Recycling Guide (Revision 2003) of CIGRE (B3. 02 Task Force 01), used as factory defaults, are as follows:

o

Min. SF6-%-value:

97 % (or max. 3% for air and CF4)

o

Max. dew point:

-5 °C dew point

o

Max. SO2-concentration.:

500 ppmv (2,000 ppmv total max. in equipment) 12

ppmv (50 ppmv concerning the re-use)

Information! Please note that for HF no maximum tolerable impurity value is given by any authorisation body until today.

Fig. 6.20

Fig. 6.21

Date / Time (Settings / Date/Time) (fig. 6.19) The internal system time is very important for the operation of the SF6-BreakerAnalyser. Synchronisation processes, shutdown and expiration times as well as time indication of measurements are determined by the internal clock. The setting of the system time can be carried out by the following four menu items: •

Set: Setting of the clock and date. Prior to the setting of time and date the time zone and the time modification should be determined under “Time zone“ and “DST automatic“. (fig. 6.21)

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•

12 hour clock: In case of a displayed cross, the time output has a 12 hours format, if not, a 24 hours format.

•

DST automatic: Automatic time modification. Many countries shift their time in summer. The installed automatic system realizes the time shift of 1 hour as valid for Central Europe (CEST). In Central Europe the summer time usually starts in the last weekend of March and ends at the last weekend of October, Saturdays at 2:00 a.m. or 3:00 a.m. A displayed cross indicates the activated automatic time modification.

Fig. 6.22

Settings of Sensors (Settings/Sensors) (fig. 6.22) Following settings of the sensors can be adjusted: •

Dew point: Dependent on the indicated mode, the moisture is displayed either in °C dew point over ice, ppm v , ppmw or °C dew point over ice at compartment pressure (pressurized dew point). The unit for the pressurized dew point is displayed as [°C Pr] (Fig. 6.23). The selected mode is valid for the output in the base menu.

Fig. 6.23

•

Pressure: The operator can select between readings in kilo Pascal “kPa“, bar “bar“ or pound per square inch “psi”.

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•

Temperature: The operator can select between readings in Celcius “°C“ or Fahrenheit “°F“.

•

Inlet pressure: The inlet pressure can selectively displayed as a absolute “abs.” or relative “rel.” pressure.

The factory defaults are in dew point, bar, Celsius and inlet pressure absolute.

Fig. 6.24

Fig. 6.25

Settings of the Device (Settings/Device) (fig. 6.24) The following settings of the device can be adjusted: •

Contrast: The contrast of the LCD.

•

Overheat alarm: The temperature of the SF6-Breaker-Analyser is controlled. In case the internal temperature exceeds the set limit, a warning message is displayed and the instrument additionally gives an audible alarm. For its protection the SF 6-BreakerAnalyser is automatically switched-off after some seconds.

•

Info about …: This menu item reveals the serial number of the device and the board as well as the version and revision number of the firmware.

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6.8

Shut down

Assure that the hose has been disconnected. Turn off the SF 6-Breaker-Analyser by pressing the “Power”-switch on the front panel. For a longer lifetime the SO 2 sensor and the HFsensor (in case of a SO2 /HF-module installed) needs some residual humidity when being stored. In order to achieve this, ambient air is automatically pumped through the system for 15 seconds, displayed through a count down. The system will subsequently turn off.

Fig. 6.26

Information! The automatic flushing function is disabled if the device is turned off through the operator within the first 15 seconds after turning on.

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7. Exchange of modules Firstly open the front panel by loosening the 2 screws on the top of the front panel like shown in figure 6.06 and let it swing down. Remove the connecting hoses of the gas input and output (two hoses per module) so that the module to be exchanged can be taken out. Connections to percentage sensor

Connections to moisture sensor

Connections to SO2- or SO2 /HF- module

Open the gas connecting couplings (quick release couplings) by pulling back the locking ring. The couplings are tight on both sides so that no air can pour into the system. Consecutively secure the hose end so that it cannot buckle, e.g. by using a wire tie or scotch tape.

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For dismounting the cartridge loosen the fixing screws of the requested module on the back side of the device and carefully pull out the module using the handle.

Battery unit

SO2- or SO2 /HF module

Gas outlet

Moisture sensor module

Percentage sensor module

Information! When returning the modules to the manufacturer use appropriate packing to avoid any transport damage.

The calibration and final control in accordance with the company’s quality assurance is indicated on each sensor cartridge with month and year on the test badge.

The calibration services for the device is listed below. Calibration and verification of the complete device Calibration of the SO 2-module (through exchange of SO 2-sensor) Calibration of the SO 2 /HF-module (through exchange of SO2-and HF-sensor) Calibration of the percentage sensor module Calibration of the moisture sensor module

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8. Fault correction It is not recommended to carry out repair works of the SF6-Breaker-Analyser by yourself. (except for the disassembling of single modules). Do not carry out any repair or other works on the modules. In case of malfunction return them to the manufacturer.

Messages on the display of the SF 6-Breaker-Analyser

During the operation, different messages can appear on the display. The messages are selfexplanatory or mentioned in the above description of the measuring process. In case unknown error messages appear, particularly in connection with malfunctions contact the manufacturer.

9.

SF6-recovery bags / recovery systems

Legal directives becoming more and more strict and the voluntary self-commitment of the SF6-users also require the collection of used gas even of smallest amounts of SF 6, as being discharged during measurements. For this purpose, recovery bags as well as recovery systems have been developed.

The SF6-Breaker-Analyser is equipped with a gas outlet at the back plane that can be easily connected to a recovery system like SF 6-Recovery-Kit. The internal pressure monitoring of the SF6-Breaker-Analyser executes an automatic abortion of a measurement in case of an overpressure caused by a filled up recovery system in order to avoid any damages to the device and incorrect readings. This technical design allows the SF 6-Breaker-Analyser to be operated with or without recovery bags or a recovery system. Still G.A.S. highly recommends to use such systems for environmental reasons.

According to the standard configuration the outlet is open, which means that the gas is

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released to the atmosphere. If a recovery bag or system is connected the inspected SF6 is collected in a depressurized condition via the connecting hose. After having reached the maximum consumption capacity of the discharge recovery system, the installed compressor switches on and the collected measuring gas is forwarded into a connected gas cylinder. G.A.S. recommends to use its SF 6-Recovery-Kit for collecting and handling the inspected gas properly.

For further details please contact WIKA-Dortmund/G.A.S..

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10 Technical Data SYSTEM Connection Self-sealing quick connector

Pressure 0,5-14 bar (gaseous) with automatic flow rate regulation

Flow rate Depending on installed modules Operation -Purge function for tube cleaning -Cleaning function with ambient air if necessary (for SO2 and SO2 /HF-module) Display Graphic Display (240x128 Pixel)

Sensor 1 SO2- and SO2 /HFMeasuring range SO2:0 - 10 / 20 / 100 / 500 ppmv (selectable) SO2 /HF: 0-10/0-10 ppmv or 0-20/0-10 ppmv (selectable) Indication Resolution: 0.1 ppm v (0-10,20) and 1 ppmv (0-100, 500) Temperature compensated

Tolerance ± 1 ppm v (0-10,20) +/-2% of value Humidity range up to 90 % no condensations

Lifetime 24 months from installation

Supply Lithium-Ion battery with min. 8 h Capacity Rechargeable 100-265 AC V 50/60Hz Temperature Storage: -10 to 60 °C Operation: 0 to 50 °C

Calibration not required

Dimensions Enclosure: 380 x 185 x 440 mm (BxHxL)

Long-term stability < 1 % signal degradation per month (linear) < 0.5% (0-500 ppmv) Flow rate 10 L/h

Weight approx. 12 kg

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Maximum zero shift 0,1 ppmv

Sensor 2 Moisture-Measuring range + 20 to -60 °C dewpoint

Indication Related to ambient pressure and temperature compensated in °C td, ppmv and ppmw and dew point at compartment pressure (pressurized dew point) °C td Pr Tolerance Dewpoint +20...-40 °C: ±2°C dewpoint Flow rate 20 L/h

< -40 °C:

C ±4°

Calibration Every 2 years Sensor 3 SF6-Percentage 0 – 100 Vol. % SF6

Tolerance ± 0.5

% based on SF6-N2Mixtures Flow rate 3 L/h

Manual SF6-Breaker-Analyser HF 100819

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