exported
necessary
power transformer
IRI:
http://www.inf.ufrgs.br/ontologies/copi#Powertransformer
Generated on 2026-04-13
Natural Language Definition
EN
A power transformer is a transformer that bears an electrical power transformation function, realized by electromagnetic induction to transform alternating voltage and current systems to different levels at the same frequency for power transmission purposes.
PT-BR
Um transformador de potência é um transformador que possui uma função de transformação de energia elétrica, realizada por indução eletromagnética para transformar sistemas de tensão e corrente alternadas para diferentes níveis na mesma frequência para fins de transmissão de energia.
Formal Axioms
Semi-formal (Aristotelian)
Every power transformer is a transformer that has the function of transforming electrical power through electromagnetic induction, taking alternating current at one voltage level as input and producing alternating current at different voltage level(s) as output for power transmission.
First-Order Logic Theory
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▸ Stored override
∀x(PowerTransformer(x) ↔ (Transformer(x) ∧ ∃f(ElectricalPowerTransformationFunction(f) ∧ bearerOf(x,f)) ∧ ∃r(ElectricalPowerTransmissionRole(r) ∧ bearerOf(x,r))))
OWL 2 / Turtle
@prefix copi: <https://www.inf.ufrgs.br/ontologies/copi/> .
@prefix : <https://www.inf.ufrgs.br/ontologies/copi/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix bfo: <http://purl.obolibrary.org/obo/> .
@prefix iof-core: <https://spec.industrialontologies.org/ontology/construct/> .
@prefix iof-av: <https://spec.industrialontologies.org/ontology/annotation/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix qudt: <http://qudt.org/schema/qudt/> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix apv: <http://inf.ufrgs.br/ontologies/apv#> .
### COPI — Core Ontology for Petroleum Installations
### Class module: PowerTransformer
<https://www.inf.ufrgs.br/ontologies/copi>
rdf:type owl:Ontology ;
dcterms:title "Core Ontology for Petroleum Installations (COPI)"@en ;
dcterms:title "Ontologia Core para Instalações de Petróleo (COPI)"@pt-br ;
dcterms:description "BFO/IOF-Core conformant ontology of equipment classes for petroleum production plants, developed using the five-step RDL enrichment method."@en ;
skos:scopeNote "Material artifacts (bfo:material_entity) that (i) are part of a petroleum production plant, and (ii) bear at least one function whose realization involves the transport (e.g. production and injection), processing (separation and other processes), control, monitoring, measurement, containment or offloading of material or energy."@en ;
skos:scopeNote "Artefatos materiais (bfo:material_entity) que (i) fazem parte de uma planta de produção de petróleo, e (ii) possuem ao menos uma função cuja realização envolve o transporte (p. ex. produção e injeção), processamento (separação e outros processos), controle, monitoramento, medição, contenção ou escoamento de material ou energia."@pt-br ;
skos:scopeNote "COPI provides high-level equipment categories defined by function to demonstrate the defined-class mechanism. Equipment subtypes are annotated with references to CFIHOS and PCA RDL terms. COPI is not a reference data library; organizations should use CFIHOS, PCA RDL, or ISO 14224 for comprehensive equipment classification."@en ;
skos:scopeNote "COPI fornece categorias de alto nível de equipamentos definidas por função para demonstrar o mecanismo de classe definida. Os subtipos de equipamentos são anotados com referências aos termos do CFIHOS e do PCA RDL. COPI não é uma biblioteca de dados de referência; organizações devem utilizar o CFIHOS, o PCA RDL ou a ISO 14224 para classificação abrangente de equipamentos."@pt-br ;
owl:versionInfo "1.1.0" ;
owl:imports <https://spec.industrialontologies.org/ontology/core/Core/> ;
owl:imports <http://purl.obolibrary.org/obo/bfo/2020/bfo.owl> ;
dcterms:creator "Nicolau Oyhenard dos Santos"@en ;
dcterms:contributor "Cauã Antunes" ;
dcterms:contributor "Haroldo Rojas" ;
dcterms:contributor "Rafael Petry" ;
dcterms:contributor "Régis Romeu" ;
dcterms:contributor "Mara Abel" ;
dcterms:isPartOf <https://inf.ufrgs.br/projetos/OntoKG> ;
dcterms:publisher "Universidade Federal do Rio Grande do Sul (UFRGS)"@en ;
dcterms:license <https://creativecommons.org/licenses/by/4.0/> ;
dcterms:created "2026-04-08"^^xsd:date ;
dcterms:modified "2026-10-07"^^xsd:date ;
apv:GlobalMinLanguageCoverage "en pt-br" ;
apv:ClassURIFormationRule "https://www[.]inf[.]ufrgs[.]br/ontologies/copi/(COPI_[0-9]{7}|[A-Z][A-Za-z0-9]*)" ;
apv:ClassMinAnnotationCoverage "rdfs:label https://spec.industrialontologies.org/ontology/annotation/naturalLanguageDefinition" .
iof-av:naturalLanguageDefinition rdf:type owl:AnnotationProperty ;
apv:MinAnnotationLength 20 .
### Identity-giving function
:COPI_0000199 rdf:type owl:Class ; # ElectricalPowerTransformationFunction
rdfs:subClassOf iof-core:DesignedFunction ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:allValuesFrom :COPI_0000497 # ElectricalPowerTransformationProcess
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:someValuesFrom :COPI_0000497 # ElectricalPowerTransformationProcess
] ;
rdfs:label "electrical power transformation function"@en ;
rdfs:label "função de transformação de energia elétrica"@pt-br .
### Process type
:COPI_0000497 rdf:type owl:Class ; # ElectricalPowerTransformationProcess
rdfs:subClassOf iof-core:PlannedProcess ;
rdfs:label "electrical power transformation process"@en ;
rdfs:label "processo de transformação de energia elétrica"@pt-br .
### Equipment universal: PowerTransformer
:COPI_0000141 rdf:type owl:Class ; # PowerTransformer
rdfs:subClassOf :COPI_0000086 ; # Transformer
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasFunction ; # Object branch (MaterialArtifact/Assembly/Object/FiatObjectPart)
owl:someValuesFrom :COPI_0000199 # ElectricalPowerTransformationFunction
] ;
rdfs:label "power transformer"@en ;
rdfs:label "transformador de potência"@pt-br ;
iof-av:naturalLanguageDefinition "A power transformer is a transformer that bears an electrical power transformation function, realized by electromagnetic induction to transform alternating voltage and current systems to different levels at the same frequency for power transmission purposes."@en ;
skos:definition "A power transformer is a transformer that bears an electrical power transformation function, realized by electromagnetic induction to transform alternating voltage and current systems to different levels at the same frequency for power transmission purposes."@en ;
iof-av:naturalLanguageDefinition "Um transformador de potência é um transformador que possui uma função de transformação de energia elétrica, realizada por indução eletromagnética para transformar sistemas de tensão e corrente alternadas para diferentes níveis na mesma frequência para fins de transmissão de energia."@pt-br ;
iof-av:isPrimitive "true"^^xsd:boolean ;
rdfs:subClassOf [ rdf:type owl:Restriction ; owl:onProperty bfo:BFO_0000196 ; owl:someValuesFrom :COPI_0000058 ] ;
skos:definition "[ISO 15926-4] A <POWER TRANSFORMER> is an <ARTEFACT> and a <TRANSFORMER> and an <ELECTRIC POWER CONVERTER> that, by electromagnetic induction, transforms a system of alternating voltage and current into another system of voltage and current usually of different values and at the same frequency for the purpose of transmitting electrical power"@en ;
skos:definition "[POSC Caesar] A transformer that, by electromagnetic induction, transforms a system of alternating voltage and current into another system of voltage and current usually of different values and at the same frequency for the purpose of transmitting electrical power."@en .
Axiomatization Decision Log
1
Identity-Giving Function
Function class
ElectricalPowerTransformationFunction
⊑ DesignedFunction
Realized in
ElectricalPowerTransformationProcess
⊑ PlannedProcess
The identity-giving function is the electromagnetic transformation of alternating voltage and current systems to different values at the same frequency for power transmission. This is what makes a power transformer distinct from other electrical equipment like motors, generators, or measuring transformers.
2
Genus Determination
Transformer
From parent_candidates, 'TRANSFORMER' is the most specific superclass. Power transformer is a subtype of the broader transformer category. Transformers are Assemblies because they have multiple physically connected components (windings, core, housing, cooling systems) that work together as a causally unified object for maintenance and operation.
3
Necessary Parts
No necessary parts recorded (concept may be primitive at this level).
Power transformers require specialized windings rated for power transmission currents/voltages, plus standard transformer components for electromagnetic function and physical protection.
4
Process Participation Signature ⟨I, O, T⟩
Inputs (I)
—
Outputs (O)
—
Transformation (T)
electromagnetic voltage and current level transformation with power conservation
Power transformers transform AC electrical energy from one voltage/current level to another while maintaining power (minus losses) and frequency, specifically for power transmission applications.
5
Axiom Mode Decision
Necessary conditions only
— modelled as a primitive universal
(⊑, SubClassOf). Identity is grounded in designed
function and cannot be reduced to a property checklist.
Cross-Standard Observations
Both ISO 15926 and POSC Caesar provide nearly identical definitions, emphasizing electromagnetic induction, voltage/current transformation, and power transmission purpose. The consistency across standards indicates a well-established understanding of this equipment type.
