Rapid Spot-Test Methods for the Evaluation of Used Transformer Oil

1958 ◽  
Vol 77 (3) ◽  
pp. 893-894
Author(s):  
R. E. Reinhard ◽  
W. E. Elliott ◽  
E. P. Schram
Keyword(s):  
Test Methods ◽  
Spot Test ◽  
Transformer Oil

Research on Corrosive Sulfur and Temperature Effect in Transformer Oil

2011 ◽  
Vol 282-283 ◽  
pp. 492-496 ◽  
Author(s):  
Yi Hua Qian ◽  
Qi Tian Bao ◽  
Shun An Cao ◽  
Rui Liu
Keyword(s):  
High Temperature ◽  
Temperature Effect ◽  
Test Methods ◽  
Transformer Oil ◽  
Test Conditions ◽  
Typical Test

Failure in transformers could be caused by the corrosive sulfur in their oil. Preliminary studies on the test of corrosive sulfur in transformer oil and temperature are performed. The comparison among their results of their typical test methods for corrosive sulfur is discussed. It is illustrated that the corrosive-sulfur sensitivity is varied with the test conditions. Temperature is the important factor for the reaction of corrosive sulfur with copper. We have done experiments of specimen immersing and mercaptan content in oil, so we can confirm that high temperature enhances the reaction.

Chromatographic Analysis of Oil-Based Electrical Equipment Discharge Failure

2014 ◽  
Vol 602-605 ◽  
pp. 2953-2957
Author(s):  
Guo Bin Liu ◽  
Ning Wang ◽  
Qing Hao Wang ◽  
Tian Shu Hai ◽  
Chuan Zong Zhao ◽  
...  
Keyword(s):  
Chromatographic Analysis ◽  
Chromatographic Method ◽  
Electrical Equipment ◽  
Test Methods ◽  
Transformer Oil ◽  
Stable Operation ◽  
Safe Operation ◽  
Fault Type ◽  
Important Means ◽  
Extent Of Damage

Discharge of failure was the fault type are likely to occur in transformers, bushings, transformers, and the extent of damage to the equipment is a serious and direct impact on the stable operation of the system, first introduced the principle and gas chromatographic analysis its test methods, then gas chromatography equipment discharge failure is how to judge the conduct described. Through the analysis of transformer oil chromatographic method can be found as early as possible transformers and other equipment inside the existence of latent failures, thus chromatography is to oversee and guarantee the safe operation of an important means of transformer.

Identification of Curing Agents in Rubber Products. Ultraviolet Absorptiometric Analysis of Selective Solvent Extracts

1956 ◽  
Vol 29 (1) ◽  
pp. 319-332 ◽  
Author(s):  
K. E. Kress ◽  
F. G. Stevens Mees
Keyword(s):  
Quality Control ◽  
Aqueous Solutions ◽  
Organic Compounds ◽  
Ethyl Ether ◽  
Test Methods ◽  
Spot Test ◽  
Selective Solvent ◽  
Elapsed Time ◽  
Quantitative Results ◽  
Curing Agents

Abstract A method has been devised for identification of organic compounds that accelerate the vulcanization of rubber products. Identification of these active trace materials aids product improvement and quality control. Identification is made through ultraviolet spectrophotometric absorbance curves over the 220 to 380 mµ region on the aqueous alkali or acid extracts, or on liquid-liquid ethyl ether extracts of the aqueous solutions. Thiazole, thiuram, thiocarbamate, amine, and guanidine classes of commercial accelerators are regularly identified in 2 grams of uncured or cured rubber products, with less than 4 hours' elapsed time. Interference of common softeners and antioxidants is usually negligible. The method is more rapid than chromatographic procedures and more sensitive and specific than spot-test methods. Quantitative results may be obtained if calibration work is undertaken.

scholarly journals Evaluation of Market Samples of Lauha Bhasma using Namburi Phased Spot Test (NPST)

2021 ◽  
Vol 12 (3) ◽  
pp. 549-552
Author(s):  
Rakshitha D ◽  
Mandvi Sharma ◽  
Gazala Hussain ◽  
Vinay R Kadibagil
Keyword(s):  
Test Methods ◽  
Spot Test ◽  
Time Period ◽  
Standard Values

Introduction: Lauha bhasma is a herbo- metallic preparation in Ayurveda; it possesses ruksha- guru- lekhana guna, madhura vipaka, sheeta veerya which is indicated in kushta, kshaya, pandu, krimi, etc. disease conditions. Though bhasma are prepared by following the classical methods, in this commercialized world its purity and quality is a question. So in this study, classical bhasma pareeksha and Namburi Phased Spot Test (NPST) methods were employed on two market samples of Lauha bhasma to assess their purity and quality. Materials and Methods: Lauha bhasma of both market samples (sample 1 and sample 2) were subjected to classical bhasma pareeksha and NPST test methods. Observations and Results: Both samples were subjected to NPST and different test methods then parameters obtained were compared to standard values as per CCRAS guidelines. Discussion: Both samples of Lauha bhasma have passed the classical bhasma pareeksha suggestive of proper formation ofbhasma but differed in the time period of changes observed at different phases in NPST test. pH of both samples signifies the alkaline nature of bhasma. Conclusion: Both samples have tested for different parameters in which sample 1 showed changes as mentioned in NPST standards on-time compared to sample 2. 

New records of lichens from the State of Azad Jammu and Kashmir, Pakistan corroborated by ITS sequences

Nova Hedwigia ◽  
2019 ◽  
Vol 109 (3) ◽  
pp. 457-473
Author(s):  
Kamran Habib ◽  
Abdul Nasir Khalid
Keyword(s):  
New Records ◽  
Phylogenetic Analyses ◽  
Test Methods ◽  
Spot Test ◽  
The State ◽  
Its Sequences ◽  
Jammu And Kashmir ◽  
Punctelia Rudecta

During a survey of the lichens in the state of Azad Jammu and Kashmir, many specimens were collected from Peer Chinasi, district Muzaffarabad and characterized using morpho-anatomical, molecular and spot test methods. This yielded two new records for Pakistan, namely Acarospora badiofusca, and Peltigera didactyla, while Punctelia ruderata is taxonomically corrected as it was previously misidentified from Pakistan as Punctelia rudecta. Brief descriptions and phylogenetic analyses of the taxa are given.

A specific spot test for iron

1960 ◽  
Vol 23 ◽  
pp. 225-226 ◽  
Author(s):  
K LALMALLIK ◽  
B SEN
Keyword(s):  
Spot Test

Laboratory proficiency in susceptibility testing of Helicobacter pylori using agar dilution and E test methods

2001 ◽  
Vol 120 (5) ◽  
pp. A586-A587
Author(s):  
L BEST ◽  
S JO ◽  
V VANZANTEN ◽  
D HALDANE ◽  
V LOO ◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
Susceptibility Testing ◽  
Test Methods ◽  
Agar Dilution

Scientific and Standardization Committee Communications Comparison of Test Methods for the Lupus Anticoagulant: International Survey on Lupus Anticoagulants-I (ISLA-1)

1990 ◽  
Vol 64 (03) ◽  
pp. 478-484 ◽  
Author(s):  
Thomas Exner ◽  
Douglas A Triplett ◽  
David A Taberner ◽  
Margaret A Howard ◽  
E Nigel Harris
Keyword(s):  
Lupus Anticoagulant ◽  
Test Methods ◽  
Positive Sample ◽  
Direct Proportion ◽  
Clotting Time ◽  
Preliminary Screening ◽  
Activated Platelets ◽  
Tissue Thromboplastin ◽  
Kaolin Clotting Time ◽  
Induced Defects

SummarySix lyophilized plasma samples were sent to 20 “expert” laboratories for assessment of lupus anticoagulant (LA). Four samples contained pooled LA of graded potency mixed with aged normal plasma. One contained LA plus cephalin phospholipid and one contained a nonspecific venom anticoagulant. Sixteen methods were used overall with some participants using up to 8 methods. Results were scored in regard to the known potencies of LA in the samples and other known induced defects.Activated partial thromboplastin time (APTT) tests used by most participants for preliminary screening were relatively sensitive, but non-specific. Platelet or phospholipid neutralization procedures (PNP) appeared to be sensitive and specific but showed a non-linear response to increased LA content. Kaolin clotting time (KCT) tests showed the most sensitive response to increased LA content but the weaker LA were not scored as abnormal by most laboratories as the samples may have contained platelet fragments. Other commonly used tests such as the tissue thromboplastin inhibition (TTI) test and the dilute Russell’s viper venom test (DRVVT) were carried out somewhat inconsistently. The variability in performance of tests in different laboratories indicates that standardization of methodology is urgently required.Generally it seemed that most clotting tests were “bypassed” by the addition of phospholipid to a known LA-positive sample in apparently direct proportion to their sensitivity. Sample preparation, especially prevention of contamination with activated platelets is a vital preliminary part in the assay of LA.

A method for measuring the in-plane compressive strength and the compression behavior of coating layers

TAPPI Journal ◽  
2011 ◽  
Vol 10 (7) ◽  
pp. 29-34
Author(s):  
TEEMU PUHAKKA ◽  
ISKO KAJANTO ◽  
NINA PYKÄLÄINEN
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Calcium Carbonate ◽  
Coating Layer ◽  
Test Methods ◽  
Coating Films ◽  
Precipitated Calcium Carbonate ◽  
Coating Color ◽  
Mineral Coatings ◽  
Styrene Butadiene

Cracking at the fold is a quality defect sometimes observed in coated paper and board. Although tensile and compressive stresses occur during folding, test methods to measure the compressive strength of a coating have not been available. Our objective was to develop a method to measure the compressive strength of a coating layer and to investigate how different mineral coatings behave under compression. We used the short-span compressive strength test (SCT) to measure the in-plane compressive strength of a free coating layer. Unsupported free coating films were prepared for the measurements. Results indicate that the SCT method was suitable for measuring the in-plane compressive strength of a coating layer. Coating color formulations containing different kaolin and calcium carbonate minerals were used to study the effect of pigment particles’ shape on the compressive and tensile strengths of coatings. Latices having two different glass transition temperatures were used. Results showed that pigment particle shape influenced the strength of a coating layer. Platy clay gave better strength than spherical or needle-shaped carbonate pigments. Compressive and tensile strength decreased as a function of the amount of calcium carbonate in the coating color, particularly with precipitated calcium carbonate. We also assessed the influence of styrene-butadiene binder on the compressive strength of the coating layer, which increased with the binder level. The compressive strength of the coating layer was about three times the tensile strength.

Sign in / Sign up

Export Citation Format

Share Document