mmi {CNAIM} | R Documentation |
This function returns a combined factor using a maximum and
multiple increment (MMI) technique
(cf. CNAIM, 2017. page 50, section 6.7.2). The function can be used
to derive the health score factor for EHV and 132kV transformers.
For deriviation of the health score factor for all other assets see
health_score_excl_ehv_132kv_tf
.
To derive the health score factor for EHV and 132kV transformers one needs
to use mmi
() to derive the health score factor for
the main transformer and for the tapchanger respectively.
The constants factor_divider_1
, factor_divider_2
and max_no_combined_factors
are all available in the lookup
table 10 and 11 on page 53 and 54 in CNAIM (2017).
For an in deph desciption see also section 6.8 on page 53 in CNAIM (2017).
The mmi
() can also be used in the derivation of observed and measured
condition factors for all assets, using measured and observed
input factors.
The constants factor_divider_1
, factor_divider_2
and
max_no_combined_factors
can be found in table 13 on page 59
(observed condition factors) and in table 15 on page 63
(measured condition factors).
mmi(factors, factor_divider_1, factor_divider_2, max_no_combined_factors)
factors |
Numeric vector. Factors to me combined. |
factor_divider_1 |
Numeric. Constant that specifies the degree to which additional “good” or “bad” factors are able further drive the combined factor. |
factor_divider_2 |
Numeric. Constant that specifies the degree to which additional “good” or “bad” factors are able further drive the combined factor. |
max_no_combined_factors |
Numeric. Specifies how many factors are able to simultaneously affect the combined factor. |
Numeric. Combined factor.
DNO Common Network Asset Indices Methodology (CNAIM), Health & Criticality - Version 1.1, 2017: https://www.ofgem.gov.uk/system/files/docs/2017/05/dno_common_network_asset_indices_methodology_v1.1.pdf
mmi(factors = c(1, 1.5), factor_divider_1 = 1.5, factor_divider_2 = 1.5, max_no_combined_factors = 1)