IEEE Std C37.122.7:2021 pdf download.IEEE Guide for Field Testing of Gas-Insulated Substations Rated Above 52 kV.
This guide provides guidance and recommendations for required and optional field tests of newly installed gas-insulated substations above 52 kV.
1.2 Word usage
The word shall indicates mandatory requirements strictly to be tollowed in order to contOrm to the standard and from which no deviation is permitted (shall equals is required to).
The word should indicates that among several possibilities one is recommended as particularly suitable, without mentioning or excluding others: or that a certain course of action is preferred but not necessarily required (should equals is recoin mended that).
The word may is used to indicate a course of action permissible within the limits of the standard (may equals i.c permitted to).
The word can is used for statements of possibility and capability, whether material, physical. or causal (can equals is able to).
2. Normative references
The following referenced documents are indispensable for the application of this document (i.e., they must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
IEC 62271-203, High-voltage switchgear and controlgear—Part 203: Gas-insulated metal-enclosed switchgear for rated voltages above 52 kV.
IEEE Std 8OTNI, IEEE Guide for Safety in AC Substation Grounding.
IEEE Std C37. 100.1-201 8TM, IEEE Standard for Common Requirements fbr High-Voltage Power Switchgcar Rated Above 1000 V.
3.2 Acronyms and abbreviations
GIS gas-insulated substation
liv high voltage
LCC local-control cabinet
OEM original equipment manufacturer
PD partial discharge
4. Field testing in accordance with IEEE Std C37.122TM
4.1 Introduction
In most cases, field tests performed on newly installed gas-insulated substation (GIS) are not repeats of the factory tests, but rather tests required to confirm that both the GIS has been assembled properly at site, and that there is no damage caused by shipping or installation.
This guide will describe the tests required on the newly installed GIS systems, why these field tests are performed, and why certain tests are repeated in the field when they were already completed in the factory. Following the discussion of the individual tests, certain best practices will be described that will assist the testing effort in dealing with unique situations or typical questions commonly encountered during field testing ofGIS.
Please refer to the field-testing clause, in IEEE Std C37. 122.1 TM for additional information)’
4.2 Mechanical tests: Leakage
4.2.1 Introduction
This test is performed to demonstrate that there are no gas leaks at the field assembled joints of the GIS. Leaks
may occur during field assembly as a result of the following:
Sealing surface damage
Improper placement. damage or omission of seals
Improper application of lubricants and sealants.IEEE Std C37.122.7 pdf download.