* Analysis of TCG ( Total Combustible Gas ) and 6 kinds of Gases * High Sensitivity for C 2

Transcription

1 Portable DGA Dissolved Gas Analyzer <Model : PGA-300> MITSUBISHI Portable Dissolved Gas Analyzer (PGA-300) is used to analyze 6 kinds of dissolved gases in transformer oil, thereby improving prompt action of maintenance and reducing maintenance cost. Operation of this apparatus is easily done after setting the sample oil which is sampled from transformer. A whole operation sequence of this apparatus is controlled by a microprocessor. It has the advantage of being handy to carry. Features * Analysis of TCG ( Total Combustible Gas ) and 6 kinds of Gases * High Sensitivity for C 2 H 2 that is Key Gas in Transformer Abnormality * Quick Measurement ( 15 minutes ) * Small amount of oil sample (50 cc) * Compact and Light (12 kg) * Equipped with Communication Interface SDK-M8789(1/2)

2 Configuration Column 4Sensors Sample loop Stirring magnet Sample vessel Heater Sample oil Magnetic stirrer AP Flow controller CPU board Filter AP LCD touch panel Printer Personal Computer Specifications C O N T E N T S C 2 H2 ( A c e t y l e n e ) C 2 H4 ( E t h y l e n e ) 1 0-2, C O ( C a r b o n M o n o x i d e ) O b j e c t i v e G a s a n d H2 ( H y d r o g e n ) M e a s u r e m e n t R a n g e ( p p m ) C H4 ( M e t h a n e ) 2 0 2, C 2 H6 ( E t h a n e ) T C G , M e a s u r e m e n t A c c u r a c y ( % ) ± 2 0 M e a s u r e m e n t T i m e ( m i n ) 15 E x t r a c t i o n M e t h o d O i l S t i r r i n g U p a n d C i r c u l a t i n g A i r a b o v e O i l C a r r i e r G a s Air D i m m e n s i o n ( m m ) W D H a n d M a s s 12kg P o w e r S u p p l y o r V A C ( 5 0 / 6 0 H z ) 200VA m a x. S i n g l e - p h a s e W o r k i n g E n v i r o m e n t ( d e g r e e C ) C o m m u n i c a t i o n I / F O n e R S C p o r t f o r p r i n t e r O n e U S B p o r t f o r p e s o n a l c o m p u t e r MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE: Mitsubishi Denki Building 2-2-3, Marunouchi, Chiyoda-ku, Tokyo , Japan mitsubishielectric. c o m / TRANSMISSION & DISTRIBUTION SYSTEMS CENTER: 651 T e n w a, Ako-city, Hyogo , JAPAN Phone FAX SDK-M8789(2/2)

3 Portable DGA (Dissolved Gas Analyzer) Model PGA-300 TECHNICAL SHEET - 1-

4 1. Outline and Introduction The portable in-oil gas analyzer is a primary diagnosis equipment which is used to prevent serious troubles and designed to detect internal abnormal phenomena of transformer early by measuring the concentration of gases CO, H 2, CH 4, C 2 H 2, C 2 H 4, C 2 H 6.and the total concentration of combustible gases (TCG). After sample oil taken from transformer is set in the oil vessel, a sequence of operations, namely extraction of dissolved gas from the oil, detection of gas, and quantitative determination of gas, is executed automatically. The result of measurement is obtained as analysis data after about 15 minutes. The PGA-300 has the following advantages. (1) Measuring of TCG and 6 component gases The analyzer has the gas detecting ability which is necessary for the detection and diagnosis of incipient transformer abnormality. This analyzer equipped with a special separating column to separate component gases and 4 kinds of sensors having different gas detection characteristics is capable of measuring the total combustible gas concentration (TCG) and the concentration of gases CO, H 2, CH 4, C 2 H 2, C 2 H 4, and C 2 H 6. (2) High sensitivity of the C 2 H 2 (Acetylene) The analyzer can detect very low concentration of C 2 H 2 (Acetylene) even though it s concentration is 0.5ppm in transformer oil. C 2 H 2 (Acetylene) is the key gas for detection of transformer abnormality since it is the characteristic gas produced in occurrence of partial discharge and high temperature local heating in oil immersed transformer. (3) Sampling oil amount is small. The quantity of oil to be taken for analysis is as small as 50 ml. (4) Quick measurement is ensured. Since the result of measurement can be obtained about 15 minutes after start of measurement, quick diagnosis is ensured. (5) Equipped with sophisticated man-machine interface The operator-operation panel interaction system ensures easy measurement. The result of measurement is indicated on the LCD. (6) Compact size and light for carry The analyzer is so compact and light that it can be easily carried to the measuring site. (7) Database can be made on the personal computer by using the attached Data Management Program which performs data communication via USB serial port, data acquisition and diagnosis. - 2-

5 2. Specifications Table 2.1 shows the specifications of the PGA-300. Table 2.1 Specifications of PGA-300 General Extraction section Detection section Control section Size Mass Item Power supply Range of operating temperature W450 D200 H355 (mm) Approx. 12 kg Description AC or V (50/60Hz) 200VA single-phase 0 C - 45 C Gas extraction method Equilibrium extraction with oil stirring and circulating air above oil Quantity of sample oil 50 ml Gases to be detected (Objective gases) Detection concentration Separating column Detecting sensor Measurement accuracy Measurement time Carrier gas PWB Composition Control/ data processing MMI/F Communication I/F Data acquisition Carbon monoxide (CO), hydrogen (H 2 ), methane (CH 4 ), acetylene (C 2 H 2 ), ethylene (C 2 H 4 ), ethane (C 2 H 6 ) and TCG TCG : 50 10,000 ppm C 2 H 2 : ppm C 2 H 4 : 10 2,000 ppm H 2, CO,CH 4,C 2 H 6 : 20 2,000 ppm Special chromatographic column 4 kinds of Semiconductor with Platinum filament sensor (Hot wire semiconductor sensor) ±20% Within the range of C 2 H 2,: 20 to 500 ppm Within the range of CO, H 2, CH 4, C 2 H 4, and C 2 H 6 : 20 to 1,000 ppm 15 minutes (for the first measurement after power is turned on, the waiting time of 30 minutes is required) Atmospheric Air CPU,DI/O PWB x1pc A/I PWB x 1PC 32-bit CPU for control/data processing LCD touch panel Printer (Option) :Graphic thermal printer One RS-232C port for printer and one USB port for personal computer 100 analysis results - 3-

6 3. Configuration Fig 3.1 shows the piping diagram of Portable DGA. And Fig 3.2 shows the appearance of this apparatus. C o l u m n 4Sensors Sample loop Stirring magnet Sample vessel Heater Sample oil Magnetic stirrer AP Flow controller CPU board Filter AP LCD touch panel Printer Personal Computer Fig.3.1 Block diagram Fig 3.2 Appearance of PGA

7 4. Standard Accessories and Recommended Spare parts Details of standard accessories and spare parts, recommended spare parts, optional parts and maintenance tools are shown in Tables 4.1, 4.2, 4.3 and 4.4 respectively. Table4.1 Standard accessories and spare parts No. Nomenclature Description Quantity 1 Data Management Program For Windows based Personal Computer (Personal Computer is not included.) 1 piece 2 Serial communication cable USB cable 1 piece 3 Oil trap filter For inline of tubing 1 piece 4 Inlet oil filter For gas inlet of gas extraction probe 1 piece 5 O-ring For gas extraction probe 1 piece 6 Sample oil vessel For gas extraction 1 piece Table 4.2 Recommended spare parts No. Nomenclature Description 1 Air filer For carrier air filer 2 Oil trap filter For inline of tubing 3 Inlet oil filter For gas inlet of gas extraction probe 4 O-ring For gas extraction probe 5 Sample oil vessel For gas extraction Table 4.3 Optional parts No. Nomenclature Description 1 Printer Graphic thermal printer with serial communication cable 2 Printer paper For printer Table 4.4 Recommended maintenance tools No. Nomenclature Description Gas cylinder contained gases mentioned bellow O 2 : 21% +/-10% C 2 H 2 : 50ppm +/-20% 1 Standard gas mixture CO: 300ppm +/-20% C 2 H 4 : 300ppm +/-20% H 2 : 200ppm +/-20% C 2 H 6 : 300ppm +/-20% CH 4 : 200ppm +/-20% N 2 : Main component 2 Pressure regulator For cylinder of standard gas mixture Necessary for adjusting output pressure of 10kpa - 5-