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GB/T 7598: Historical versions
| Std ID | Version | USD | Buy | Deliver [PDF] in | Title (Description) |
| GB/T 7598-2008 | English | 259 |
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Determination of water-soluble acid in transformer oils in service
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| GB/T 7598-1987 | English | 199 |
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Determination of water-soluble acid in transformer and turbine oils in service by colormetric method
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Basic data
| Standard ID | GB/T 7598-2008 (GB/T7598-2008) |
| Description (Translated English) | Determination of water-soluble acid in transformer oils in service |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | E38 |
| Classification of International Standard | 75.100 |
| Word Count Estimation | 11,162 |
| Date of Issue | 2008-09-24 |
| Date of Implementation | 2009-08-01 |
| Older Standard (superseded by this standard) | GB/T 7598-1987 |
| Quoted Standard | GB/T 601 |
| Regulation (derived from) | National Standard Approval Announcement 2008 No.16 (Total No.129) |
| Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China |
| Summary | This standard specifies the method for the determination of transformer oil in the water-soluble acid. This method is suitable for the operation of transformer oil, other mineral oils measured water soluble acids may refer to. |
GB/T 7598-2008: Determination of water-soluble acid in transformer oils in service
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Determination of water-soluble acid in transformer oils in service
ICS 75.100
E38
National Standards of People's Republic of China
Replacing GB/T 7598-1987
In transformer oils in water-soluble acid assay
Posted 2008-09-24
2009-08-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Preface Ⅰ
1 Scope 1
2 Normative references 1
3 Summary of Method 1
4 Reagents and materials 1
5 Preparation 2
6 Test Step 3
Precision 3 7
Appendix A (informative) Determination of water-soluble acid (pH meter method) 4
Annex B (informative) Determination of water-soluble acid (Highly odd colorimeter method) 6
Foreword
This standard replaces GB/T 7598-1987 "in transformer oil, turbine oil water-soluble acid assay (colorimetry)."
This standard GB/T 7598-1987 and the main technical differences are as follows.
--- The name of the revision of this standard as "water-soluble acid in transformer oils Determination."
--- Modify the scope of this standard.
--- The original standard pH standard buffer solution, pH standard colorimetric solution and increase the effective use of indicators.
--- The original standard indicator was revised.
--- Original standard increased the pH standard colorimetric solution preparation step.
--- The original standard colorimetric steps do revision.
--- Of colorimetric accuracy has been revised.
--- The original contents of the appropriate standard of rescheduling.
--- Increased precision pH meter method and the method in the appendix.
The Standard Appendix A, Appendix B is an informative annex.
This standard is proposed and managed by the China Electricity Council.
This standard was drafted. Xi'an Thermal Power Research Institute Co., Ltd.
The main drafters of this standard. Feng Liping, Xiaoxiu Yuan, Meng Yuchan.
This standard supersedes the previous editions are.
--- GB/T 7598-1987.
In transformer oils in water-soluble acid assay
1 Scope
This standard specifies the determination method in transformer oils in a water-soluble acid.
This method is suitable for the operation of transformer oil, other mineral oils Determination of water-soluble acid may be implemented by reference.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
Preparation of GB/T 601 chemical reagent standard titration solution
3 Method Summary
Under test conditions, test oil samples mixed with an equal volume of distilled water, whichever is the liquid part of the water out through colorimetric determination of water-soluble oil
acid. Results are expressed as pH. Similarly, the method can be used pH meter, refer to Appendix A; Haili Qi colorimetric, see Appendix B.
4 Reagents and materials
4.1 double distilled water or demineralized water, after boiling, pH 6.0 to 7.0, a conductivity of less than 3μs/cm (25 ℃).
Potassium hydrogen phthalate 4.2. reference reagents.
4.3 potassium dihydrogen phosphate. reference reagents.
4.4 Sodium hydroxide. AR.
4.5 hydrochloric acid. AR, relative density of 1.19.
4.6 sodium phosphate dibasic anhydrous. pure class distinctions.
4.7 pH indicator. bromocresol green, bromocresol purple. Its preparation method and the color range are shown in Table 1.
Table 1 formulated indicator
Name indicator color range method of preparation
Bromocresol Green
3.8 to 5.4
Yellow - Blue
0.1g of bromocresol green and 7.5mL0.02mol/L sodium hydroxide together research absorbed, diluted with demineralized water to
250mL, then 0.1mol/L sodium hydroxide or hydrochloric acid to a pH of 4.5 to 5.4
Bromocresol purple
5.2 to 6.8
Yellow - purple
0.1g of bromocresol purple was dissolved 9.25mL0.02mol/L sodium hydroxide, diluted with demineralized water to
250mL. Then 0.1mol/L sodium hydroxide or hydrochloric acid to a pH of 6.0
Than 4.8 Color tube. a plug, a diameter of 15mm, capacity 10mL.
4.9 conical flask. 250mL.
4.10 separatory funnel. 250mL.
4.11 cylinders. 50mL.
4.12 thermometer. 0 ℃ ~ 100 ℃.
4.13 water bath.
Color box than 4.14. see Figure 1.
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