Skip to content

Class: LoadMotor

_Aggregate induction motor load. This model is used to represent a fraction of an ordinary load as "induction motor load". It allows a load that is treated as an ordinary constant power in power flow analysis to be represented by an induction motor in dynamic simulation. This model is intended for representation of aggregations of many motors dispersed through a load represented at a high voltage bus but where there is no information on the characteristics of individual motors. _

_Either a "one-cage" or "two-cage" model of the induction machine can be modelled. Magnetic saturation is not modelled. _

_This model treats a fraction of the constant power part of a load as a motor. During initialisation, the initial power drawn by the motor is set equal to Pfrac times the constant P part of the static load. The remainder of the load is left as a static load. _

The reactive power demand of the motor is calculated during initialisation as a function of voltage at the load bus. This reactive power demand can be less than or greater than the constant Q component of the load. If the motor's reactive demand is greater than the constant Q component of the load, the model inserts a shunt capacitor at the terminal of the motor to bring its reactive demand down to equal the constant Q reactive load.

If an induction motor load model and a static load model are both present for a load, the motor Pfrac is assumed to be subtracted from the power flow constant P load before the static load model is applied. The remainder of the load, if any, is then represented by the static load model.

URI: cim:LoadMotor

 classDiagram
    class LoadMotor
      IdentifiedObject <|-- LoadMotor

      LoadMotor : alias_name

      LoadMotor : d

      LoadMotor : description

      LoadMotor : diagram_objects

          LoadMotor --> DiagramObject : diagram_objects

      LoadMotor : h

          LoadMotor --> Seconds : h

      LoadMotor : instance_set

          LoadMotor --> InstanceSet : instance_set

      LoadMotor : lfac

      LoadMotor : load_aggregate

          LoadMotor --> LoadAggregate : load_aggregate

      LoadMotor : lp

          LoadMotor --> PU : lp

      LoadMotor : lpp

          LoadMotor --> PU : lpp

      LoadMotor : ls

          LoadMotor --> PU : ls

      LoadMotor : m_rid

      LoadMotor : names

          LoadMotor --> Name : names

      LoadMotor : pfrac

      LoadMotor : properties_cimdata_object

          LoadMotor --> ChangeSetMember : properties_cimdata_object

      LoadMotor : ra

          LoadMotor --> PU : ra

      LoadMotor : targeting_cimdata_object

          LoadMotor --> ChangeSetMember : targeting_cimdata_object

      LoadMotor : tbkr

          LoadMotor --> Seconds : tbkr

      LoadMotor : tpo

          LoadMotor --> Seconds : tpo

      LoadMotor : tppo

          LoadMotor --> Seconds : tppo

      LoadMotor : tv

          LoadMotor --> Seconds : tv

      LoadMotor : vt

          LoadMotor --> PU : vt

Inheritance

Slots

Name Cardinality and Range Description Inheritance
d 0..1
Float		 Damping factor (D) direct
h 0..1
Seconds		 Inertia constant (H) (>= 0) direct
lfac 0..1
Float		 Loading factor (Lfac) direct
lp 0..1
PU		 Transient reactance (Lp) direct
lpp 0..1
PU		 Subtransient reactance (Lpp) direct
ls 0..1
PU		 Synchronous reactance (Ls) direct
pfrac 0..1
Float		 Fraction of constant-power load to be represented by this motor model (Pfr... direct
ra 0..1
PU		 Stator resistance (Ra) direct
tbkr 0..1
Seconds		 Circuit breaker operating time (Tbkr) (>= 0) direct
tpo 0..1
Seconds		 Transient rotor time constant (Tpo) (>= 0) direct
tppo 0..1
Seconds		 Subtransient rotor time constant (Tppo) (>= 0) direct
tv 0..1
Seconds		 Voltage trip pickup time (Tv) (>= 0) direct
vt 0..1
PU		 Voltage threshold for tripping (Vt) direct
load_aggregate 1..1
LoadAggregate		 Aggregate load to which this aggregate motor (dynamic) load belongs direct
alias_name 0..1
String		 The aliasName is free text human readable name of the object alternative to I... IdentifiedObject
description 0..1
String		 The description is a free human readable text describing or naming the object IdentifiedObject
m_rid 0..1
String		 Master resource identifier issued by a model authority IdentifiedObject
diagram_objects 0..*
DiagramObject		 The diagram objects that are associated with the domain object IdentifiedObject
instance_set 1..1
InstanceSet		 Dataset containing the data objects IdentifiedObject
names 0..*
Name		 All names of this identified object IdentifiedObject
properties_cimdata_object 0..1
ChangeSetMember		 The single CIM data object in the appropriate dataset context IdentifiedObject
targeting_cimdata_object 0..*
ChangeSetMember		 Data objects registered IdentifiedObject

Usages

used by used in type used
LoadAggregate load_motor range LoadMotor

Identifier and Mapping Information

Schema Source

  • from schema: https://cim.ucaiug.io/ns#TC57CIM

Mappings

Mapping Type Mapped Value
self cim:LoadMotor
native cim:LoadMotor

LinkML Source

Direct

name: LoadMotor
description: "Aggregate induction motor load. This model is used to represent a fraction\
  \ of an ordinary load as \"induction motor load\".  It allows a load that is treated\
  \ as an ordinary constant power in power flow analysis to be represented by an induction\
  \ motor in dynamic simulation. This model is intended for representation of aggregations\
  \ of many motors dispersed through a load represented at a high voltage bus but\
  \ where there is no information on the characteristics of individual motors.\r\n\
  Either a \"one-cage\" or \"two-cage\" model of the induction machine can be modelled.\
  \ Magnetic saturation is not modelled.\r\nThis model treats a fraction of the constant\
  \ power part of a load as a motor. During initialisation, the initial power drawn\
  \ by the motor is set equal to <i>Pfrac</i> times the constant <i>P</i> part of\
  \ the static load.  The remainder of the load is left as a static load.\r\nThe reactive\
  \ power demand of the motor is calculated during initialisation as a function of\
  \ voltage at the load bus. This reactive power demand can be less than or greater\
  \ than the constant <i>Q</i> component of the load.  If the motor's reactive demand\
  \ is greater than the constant <i>Q</i> component of the load, the model inserts\
  \ a shunt capacitor at the terminal of the motor to bring its reactive demand down\
  \ to equal the constant <i>Q</i> reactive load.  \r\nIf an induction motor load\
  \ model and a static load model are both present for a load, the motor <i>Pfrac</i>\
  \ is assumed to be subtracted from the power flow constant <i>P</i> load before\
  \ the static load model is applied.  The remainder of the load, if any, is then\
  \ represented by the static load model."
from_schema: https://cim.ucaiug.io/ns#TC57CIM
rank: 1000
is_a: IdentifiedObject
attributes:
  d:
    name: d
    description: Damping factor (<i>D</i>).  Unit = delta <i>P</i>/delta speed.  Typical
      value = 2.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    slot_uri: cim:LoadMotor.d
    multivalued: false
    domain_of:
    - GovHydroPID2
    - GovHydroWPID
    - MechLoad1
    - LoadMotor
    range: float
    required: false
  h:
    name: h
    description: Inertia constant (<i>H</i>) (&gt;= 0).  Typical value = 0,4.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    slot_uri: cim:LoadMotor.h
    multivalued: false
    domain_of:
    - GovHydro3
    - GovHydroFrancis
    - GovHydroPelton
    - GovHydroR
    - LoadComposite
    - LoadMotor
    range: Seconds
    required: false
  lfac:
    name: lfac
    description: Loading factor (<i>Lfac</i>). The ratio of initial <i>P</i> to motor
      MVA base.  Typical value = 0,8.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    slot_uri: cim:LoadMotor.lfac
    multivalued: false
    domain_of:
    - LoadComposite
    - LoadMotor
    range: float
    required: false
  lp:
    name: lp
    description: Transient reactance (<i>Lp</i>).  Typical value = 0,15.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    rank: 1000
    slot_uri: cim:LoadMotor.lp
    multivalued: false
    domain_of:
    - LoadMotor
    range: PU
    required: false
  lpp:
    name: lpp
    description: Subtransient reactance (<i>Lpp</i>).  Typical value = 0,15.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    rank: 1000
    slot_uri: cim:LoadMotor.lpp
    multivalued: false
    domain_of:
    - LoadMotor
    range: PU
    required: false
  ls:
    name: ls
    description: Synchronous reactance (<i>Ls</i>).  Typical value = 3,2.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    slot_uri: cim:LoadMotor.ls
    multivalued: false
    domain_of:
    - LoadGenericNonLinear
    - LoadMotor
    range: PU
    required: false
  pfrac:
    name: pfrac
    description: Fraction of constant-power load to be represented by this motor model
      (<i>Pfrac</i>) (&gt;= 0,0 and &lt;= 1,0).  Typical value = 0,3.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    slot_uri: cim:LoadMotor.pfrac
    multivalued: false
    domain_of:
    - LoadComposite
    - LoadMotor
    range: float
    required: false
  ra:
    name: ra
    description: Stator resistance (<i>Ra</i>).  Typical value = 0.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    rank: 1000
    slot_uri: cim:LoadMotor.ra
    multivalued: false
    domain_of:
    - LoadMotor
    range: PU
    required: false
  tbkr:
    name: tbkr
    description: Circuit breaker operating time (<i>Tbkr</i>) (&gt;= 0).  Typical
      value = 0,08.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    rank: 1000
    slot_uri: cim:LoadMotor.tbkr
    multivalued: false
    domain_of:
    - LoadMotor
    range: Seconds
    required: false
  tpo:
    name: tpo
    description: Transient rotor time constant (<i>Tpo</i>) (&gt;= 0).  Typical value
      = 1.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    slot_uri: cim:LoadMotor.tpo
    multivalued: false
    domain_of:
    - AsynchronousMachine
    - AsynchronousMachineTimeConstantReactance
    - LoadMotor
    range: Seconds
    required: false
  tppo:
    name: tppo
    description: Subtransient rotor time constant (<i>Tppo</i>) (&gt;= 0).  Typical
      value = 0,02.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    slot_uri: cim:LoadMotor.tppo
    multivalued: false
    domain_of:
    - AsynchronousMachine
    - AsynchronousMachineTimeConstantReactance
    - LoadMotor
    range: Seconds
    required: false
  tv:
    name: tv
    description: Voltage trip pickup time (<i>Tv</i>) (&gt;= 0).  Typical value =
      0,1.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    slot_uri: cim:LoadMotor.tv
    multivalued: false
    domain_of:
    - GovHydroPelton
    - GovSteamFV4
    - LoadMotor
    range: Seconds
    required: false
  vt:
    name: vt
    description: Voltage threshold for tripping (<i>Vt</i>).  Typical value = 0,7.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    rank: 1000
    slot_uri: cim:LoadMotor.vt
    multivalued: false
    domain_of:
    - LoadMotor
    range: PU
    required: false
  load_aggregate:
    name: load_aggregate
    description: Aggregate load to which this aggregate motor (dynamic) load belongs.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    slot_uri: cim:LoadMotor.LoadAggregate
    multivalued: false
    domain_of:
    - LoadStatic
    - LoadMotor
    range: LoadAggregate
    required: true
class_uri: cim:LoadMotor

Induced

name: LoadMotor
description: "Aggregate induction motor load. This model is used to represent a fraction\
  \ of an ordinary load as \"induction motor load\".  It allows a load that is treated\
  \ as an ordinary constant power in power flow analysis to be represented by an induction\
  \ motor in dynamic simulation. This model is intended for representation of aggregations\
  \ of many motors dispersed through a load represented at a high voltage bus but\
  \ where there is no information on the characteristics of individual motors.\r\n\
  Either a \"one-cage\" or \"two-cage\" model of the induction machine can be modelled.\
  \ Magnetic saturation is not modelled.\r\nThis model treats a fraction of the constant\
  \ power part of a load as a motor. During initialisation, the initial power drawn\
  \ by the motor is set equal to <i>Pfrac</i> times the constant <i>P</i> part of\
  \ the static load.  The remainder of the load is left as a static load.\r\nThe reactive\
  \ power demand of the motor is calculated during initialisation as a function of\
  \ voltage at the load bus. This reactive power demand can be less than or greater\
  \ than the constant <i>Q</i> component of the load.  If the motor's reactive demand\
  \ is greater than the constant <i>Q</i> component of the load, the model inserts\
  \ a shunt capacitor at the terminal of the motor to bring its reactive demand down\
  \ to equal the constant <i>Q</i> reactive load.  \r\nIf an induction motor load\
  \ model and a static load model are both present for a load, the motor <i>Pfrac</i>\
  \ is assumed to be subtracted from the power flow constant <i>P</i> load before\
  \ the static load model is applied.  The remainder of the load, if any, is then\
  \ represented by the static load model."
from_schema: https://cim.ucaiug.io/ns#TC57CIM
rank: 1000
is_a: IdentifiedObject
attributes:
  d:
    name: d
    description: Damping factor (<i>D</i>).  Unit = delta <i>P</i>/delta speed.  Typical
      value = 2.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    slot_uri: cim:LoadMotor.d
    multivalued: false
    alias: d
    owner: LoadMotor
    domain_of:
    - GovHydroPID2
    - GovHydroWPID
    - MechLoad1
    - LoadMotor
    range: float
    required: false
  h:
    name: h
    description: Inertia constant (<i>H</i>) (&gt;= 0).  Typical value = 0,4.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    slot_uri: cim:LoadMotor.h
    multivalued: false
    alias: h
    owner: LoadMotor
    domain_of:
    - GovHydro3
    - GovHydroFrancis
    - GovHydroPelton
    - GovHydroR
    - LoadComposite
    - LoadMotor
    range: Seconds
    required: false
  lfac:
    name: lfac
    description: Loading factor (<i>Lfac</i>). The ratio of initial <i>P</i> to motor
      MVA base.  Typical value = 0,8.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    slot_uri: cim:LoadMotor.lfac
    multivalued: false
    alias: lfac
    owner: LoadMotor
    domain_of:
    - LoadComposite
    - LoadMotor
    range: float
    required: false
  lp:
    name: lp
    description: Transient reactance (<i>Lp</i>).  Typical value = 0,15.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    rank: 1000
    slot_uri: cim:LoadMotor.lp
    multivalued: false
    alias: lp
    owner: LoadMotor
    domain_of:
    - LoadMotor
    range: PU
    required: false
  lpp:
    name: lpp
    description: Subtransient reactance (<i>Lpp</i>).  Typical value = 0,15.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    rank: 1000
    slot_uri: cim:LoadMotor.lpp
    multivalued: false
    alias: lpp
    owner: LoadMotor
    domain_of:
    - LoadMotor
    range: PU
    required: false
  ls:
    name: ls
    description: Synchronous reactance (<i>Ls</i>).  Typical value = 3,2.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    slot_uri: cim:LoadMotor.ls
    multivalued: false
    alias: ls
    owner: LoadMotor
    domain_of:
    - LoadGenericNonLinear
    - LoadMotor
    range: PU
    required: false
  pfrac:
    name: pfrac
    description: Fraction of constant-power load to be represented by this motor model
      (<i>Pfrac</i>) (&gt;= 0,0 and &lt;= 1,0).  Typical value = 0,3.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    slot_uri: cim:LoadMotor.pfrac
    multivalued: false
    alias: pfrac
    owner: LoadMotor
    domain_of:
    - LoadComposite
    - LoadMotor
    range: float
    required: false
  ra:
    name: ra
    description: Stator resistance (<i>Ra</i>).  Typical value = 0.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    rank: 1000
    slot_uri: cim:LoadMotor.ra
    multivalued: false
    alias: ra
    owner: LoadMotor
    domain_of:
    - LoadMotor
    range: PU
    required: false
  tbkr:
    name: tbkr
    description: Circuit breaker operating time (<i>Tbkr</i>) (&gt;= 0).  Typical
      value = 0,08.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    rank: 1000
    slot_uri: cim:LoadMotor.tbkr
    multivalued: false
    alias: tbkr
    owner: LoadMotor
    domain_of:
    - LoadMotor
    range: Seconds
    required: false
  tpo:
    name: tpo
    description: Transient rotor time constant (<i>Tpo</i>) (&gt;= 0).  Typical value
      = 1.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    slot_uri: cim:LoadMotor.tpo
    multivalued: false
    alias: tpo
    owner: LoadMotor
    domain_of:
    - AsynchronousMachine
    - AsynchronousMachineTimeConstantReactance
    - LoadMotor
    range: Seconds
    required: false
  tppo:
    name: tppo
    description: Subtransient rotor time constant (<i>Tppo</i>) (&gt;= 0).  Typical
      value = 0,02.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    slot_uri: cim:LoadMotor.tppo
    multivalued: false
    alias: tppo
    owner: LoadMotor
    domain_of:
    - AsynchronousMachine
    - AsynchronousMachineTimeConstantReactance
    - LoadMotor
    range: Seconds
    required: false
  tv:
    name: tv
    description: Voltage trip pickup time (<i>Tv</i>) (&gt;= 0).  Typical value =
      0,1.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    slot_uri: cim:LoadMotor.tv
    multivalued: false
    alias: tv
    owner: LoadMotor
    domain_of:
    - GovHydroPelton
    - GovSteamFV4
    - LoadMotor
    range: Seconds
    required: false
  vt:
    name: vt
    description: Voltage threshold for tripping (<i>Vt</i>).  Typical value = 0,7.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    rank: 1000
    slot_uri: cim:LoadMotor.vt
    multivalued: false
    alias: vt
    owner: LoadMotor
    domain_of:
    - LoadMotor
    range: PU
    required: false
  load_aggregate:
    name: load_aggregate
    description: Aggregate load to which this aggregate motor (dynamic) load belongs.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    slot_uri: cim:LoadMotor.LoadAggregate
    multivalued: false
    alias: load_aggregate
    owner: LoadMotor
    domain_of:
    - LoadStatic
    - LoadMotor
    range: LoadAggregate
    required: true
  alias_name:
    name: alias_name
    description: "The aliasName is free text human readable name of the object alternative\
      \ to IdentifiedObject.name. It may be non unique and may not correlate to a\
      \ naming hierarchy.\r\nThe attribute aliasName is retained because of backwards\
      \ compatibility between CIM relases. It is however recommended to replace aliasName\
      \ with the Name class as aliasName is planned for retirement at a future time.\r\
      \n\r\n"
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    rank: 1000
    slot_uri: cim:IdentifiedObject.aliasName
    multivalued: false
    alias: alias_name
    owner: LoadMotor
    domain_of:
    - IdentifiedObject
    range: string
    required: false
  description:
    name: description
    description: The description is a free human readable text describing or naming
      the object. It may be non unique and may not correlate to a naming hierarchy.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    rank: 1000
    slot_uri: cim:IdentifiedObject.description
    multivalued: false
    alias: description
    owner: LoadMotor
    domain_of:
    - IdentifiedObject
    - NameType
    - NameTypeAuthority
    - DataSet
    - SwitchingStepGroup
    - AreaReserveSpec
    range: string
    required: false
  m_rid:
    name: m_rid
    description: "Master resource identifier issued by a model authority. The mRID\
      \ is unique within an exchange context. Global uniqueness is easily achieved\
      \ by using a UUID, as specified in RFC 4122, for the mRID. The use of UUID is\
      \ strongly recommended.\r\nFor CIMXML data files in RDF syntax conforming to\
      \ IEC 61970-552, the mRID is mapped to rdf:ID or rdf:about attributes that identify\
      \ CIM object elements."
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    rank: 1000
    slot_uri: cim:IdentifiedObject.mRID
    multivalued: false
    alias: m_rid
    owner: LoadMotor
    domain_of:
    - IdentifiedObject
    - DataSet
    range: string
    required: false
  diagram_objects:
    name: diagram_objects
    description: The diagram objects that are associated with the domain object.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    rank: 1000
    slot_uri: cim:IdentifiedObject.DiagramObjects
    multivalued: true
    alias: diagram_objects
    owner: LoadMotor
    domain_of:
    - IdentifiedObject
    range: DiagramObject
    required: false
  instance_set:
    name: instance_set
    description: Dataset containing the data objects.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    rank: 1000
    slot_uri: cim:IdentifiedObject.InstanceSet
    multivalued: false
    alias: instance_set
    owner: LoadMotor
    domain_of:
    - IdentifiedObject
    range: InstanceSet
    required: true
  names:
    name: names
    description: All names of this identified object.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    rank: 1000
    slot_uri: cim:IdentifiedObject.Names
    multivalued: true
    alias: names
    owner: LoadMotor
    domain_of:
    - IdentifiedObject
    - NameType
    range: Name
    required: false
  properties_cimdata_object:
    name: properties_cimdata_object
    description: The single CIM data object in the appropriate dataset context.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    rank: 1000
    slot_uri: cim:IdentifiedObject.PropertiesCIMDataObject
    multivalued: false
    alias: properties_cimdata_object
    owner: LoadMotor
    domain_of:
    - IdentifiedObject
    range: ChangeSetMember
    required: false
  targeting_cimdata_object:
    name: targeting_cimdata_object
    description: Data objects registered.
    from_schema: https://cim.ucaiug.io/ns#TC57CIM
    rank: 1000
    slot_uri: cim:IdentifiedObject.TargetingCIMDataObject
    multivalued: true
    alias: targeting_cimdata_object
    owner: LoadMotor
    domain_of:
    - IdentifiedObject
    range: ChangeSetMember
    required: false
class_uri: cim:LoadMotor