Three-phase alternating current measurement
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Description
A ThreePhaseAcMeasurement entity represents a measurement from an electrical
system that uses three-phase alternating current. It has attributes for various
electrical measurements such as power, frequency, current and voltage. For some
attributes such as current and voltage the value is a structured value with
properties for the three different phases: L1, L2 and L3. For some measurements
such as the different power types (active, reactive and apparent power) there is
an attribute for the total from all phases e.g. totalActivePower
and an
attribute for values from each phase as a structured value e.g. activePower
.
There are also attributes for different energy types: active (delivered net
energy), reactive and apparent. They are cumulative values and the start time
for their measurement can be saved to the dateEnergyMeteringStarted
attribute.
For most of the attributes there are various ways they can be actually measured.
For this purpose the measurementType
metadata attribute can be used. It can
have the following values:
- instant: The value is from the specific instant of time
- average: The value is the average of a time period
- rms: The value is the root mean square of a time period
- maximum: The value is the maximum of a time period
- minimum: The value is the minimum of a time period
When using the average, rms, mininum or maximum values another metadata
attribute called measurementInterval
should be used to give the length of the
measurement period in seconds. Also the timestamp
metadata attribute should be
the end time of the measurement period.
Data Model
A JSON Schema corresponding to this data model can be found here.
-
id
: Entity's unique identifier. -
type
: It must be equal toThreePhaseAcMeasurement
. -
source
: A sequence of characters giving the source of the entity data.- Attribute type: Property. Text or URL
- Optional
-
dataProvider
: Specifies the URL to information about the provider of this information- Attribute type: Property. URL
- Optional
-
name
: Name given to the measurement location or target. -
description
: A longer description of the measurement.- Attribute type: Property. Text
- Normative References:
https://uri.etsi.org/ngsi-ld/description
equivalent to description - Optional
-
location
: location of the measurement target represented by a GeoJSON point.- Attribute type: Property.
geo:json
. - Normative References: https://tools.ietf.org/html/draft-ietf-geojson-03
- Optional
- Attribute type: Property.
-
address
: Civic address where the measurement target is located.- Attribute type: Property. Address
- Normative References: https://schema.org/address
- Optional
-
areaServed
: Higher level area to which the measurement target belongs to. It can be used to group per responsible, district, neighbourhood, etc.- Normative References: https://schema.org/areaServed
- Optional
-
refDevice
: Device(s) used to obtain the measurement.- Attribute type: Property. List of Reference to entity(ies) of type Device
- Optional
-
refTargetDevice
: Device(s) for which the measurement was taken.- Attribute type: Relationship. List of Reference to entity(ies) of type Device
- Optional
-
dateModified
: Last update timestamp of this entity.- Attribute type: Property. DateTime
- Read-Only. Automatically generated.
-
dateCreated
: Entity's creation timestamp.- Attribute type: Property. DateTime
- Read-Only. Automatically generated.
-
totalActiveEnergyImport
: Total energy imported i.e. consumed since metering started (sincedateEnergyMeteringStarted
). -
totalReactiveEnergyImport
: Total energy imported i.e. consumed (with regards to fundamental frequency reactive power) since the metering start date (dateEnergyMeteringStarted
). -
totalApparentEnergyImport
: Total energy imported i.e. consumed (with regards to apparent power) since the metering start date (dateEnergyMeteringStarted
). -
totalActiveEnergyExport
: Total energy exported since metering started (sincedateEnergyMeteringStarted
). -
totalReactiveEnergyExport
: Total fundamental frequency reactive energy exported since metering started (sincedateEnergyMeteringStarted
). -
totalApparentEnergyExport
: Total energy exported (with regards to apparent power) since the metering start date (dateEnergyMeteringStarted
). -
activeEnergyImport
: Active energy imported i.e. consumed per phase since the metering start date. The actual values will be conveyed by subproperties which names will be equal to the name of each of the alternating current phases: L1, L2, L3.- Attribute type: Property. StructuredValue
- Default unit: kilowatt hour (kWh)
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
- Optional
-
reactiveEnergyImport
: Fundamental frequency reactive energy imported i.e. consumed per phase since the metering start date. The actual values will be conveyed by subproperties which names will be equal to the name of each of the alternating current phases: L1, L2, L3.- Attribute type: Property. StructuredValue
- Default unit: kilovolt-ampere-reactive-hour (kVArh)
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
- Optional
-
apparentEnergyImport
: Apparent energy imported i.e. consumed per phase since the metering start date. The actual values will be conveyed by subproperties which names will be equal to the name of each of the alternating current phases: L1, L2, L3.- Attribute type: Property. StructuredValue
- Default unit: kilovolt-ampere-hour (kVAh)
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
- Optional
-
activeEnergyExport
: Active energy exported per phase since the metering start date. The actual values will be conveyed by subproperties which names will be equal to the name of each of the alternating current phases: L1, L2, L3.- Attribute type: Property. StructuredValue
- Default unit: kilowatt hour (kWh)
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
- Optional
-
reactiveEnergyExport
: Fundamental frequency reactive energy exported per phase since the metering start date. The actual values will be conveyed by subproperties which names will be equal to the name of each of the alternating current phases: L1, L2, L3.- Attribute type: Property. StructuredValue
- Default unit: kilovolt-ampere-reactive-hour (kVArh)
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
- Optional
-
apparentEnergyExport
: Apparent energy exported per phase since the metering start date. The actual values will be conveyed by subproperties which names will be equal to the name of each of the alternating current phases: L1, L2, L3.- Attribute type: Property. StructuredValue
- Default unit: kilovolt-ampere-hour (kVAh)
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
- Optional
-
dateEnergyMeteringStarted
: The starting date for metering energy.- Attribute type: Property. DateTime
- Optional
-
frequency
: The frequency of the circuit.- Attribute type: Property. Number
- Default unit: Hertz (Hz)
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
measurementType
: How the measurement was made. (see beginning of document for details)- type: Text
measurementInterval
: For certain measurement types the measurement period. (See beginning of document for details)- type: Number
- Optional
-
totalActivePower
: Active power consumed (counting all phases)- Attribute type: Property. Number
- Default unit: watt (W).
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
measurementType
: How the measurement was made. (see beginning of document for details)- type: Text
measurementInterval
: For certain measurement types the measurement period. (See beginning of document for details)- type: Number
- Optional
-
totalReactivePower
: Reactive power consumed (counting all phases).- Attribute type: Property. Number
- Default unit: volt-ampere-reactive (VAr).
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
measurementType
: How the measurement was made. (see beginning of document for details)- type: Text
measurementInterval
: For certain measurement types the measurement period. (See beginning of document for details)- type: Number
- Optional
-
totalApparentPower
: Apparent power consumed (counting all phases).- Attribute type: Property. Number
- Default unit: volt-ampere (VA).
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
measurementType
: How the measurement was made. (see beginning of document for details)- type: Text
measurementInterval
: For certain measurement types the measurement period. (See beginning of document for details)- type: Number
- Optional
-
activePower
: Active power consumed per phase. The actual values will be conveyed by subproperties which names will be equal to the name of each of the alternating current phases: L1, L2, L3.- Attribute type: Property. StructuredValue
- Default unit: watt (W)
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
measurementType
: How the measurement was made. (see beginning of document for details)- type: Text
measurementInterval
: For certain measurement types the measurement period. (See beginning of document for details)- type: Number
- Optional
-
apparentPower
: Apparent power consumed per phase. The actual values will be conveyed by subproperties which names will be equal to the name of each of the alternating current phases: L1, L2, L3.- Attribute type: Property. StructuredValue
- Default unit: volt-ampere (VA)
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
measurementType
: How the measurement was made. (see beginning of document for details)- type: Text
measurementInterval
: For certain measurement types the measurement period. (See beginning of document for details)- type: Number
- Optional
-
reactivePower
: Fundamental frequency reactive power. The actual values will be conveyed by subproperties whose names will be equal to the name of each of the alternating current phases: L1, L2, L3.- Attribute type: Property. StructuredValue
- Default unit: volts-ampere-reactive (VAr)
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
measurementType
: How the measurement was made. (see beginning of document for details)- type: Text
measurementInterval
: For certain measurement types the measurement period. (See beginning of document for details)- type: Number
- Optional
-
totalPowerFactor
: Power factor including all phases.- Attribute type: Property. Number
- Allowed values: A number between -1 and 1.
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
measurementType
: How the measurement was made. (see beginning of document for details)- type: Text
measurementInterval
: For certain measurement types the measurement period. (See beginning of document for details)- type: Number
onlyPositive
: Is the value always greater than zero or can it also be negative. If not present this is assumed to be false.- Type: Boolean
- Optional
-
powerFactor
: Power factor for each phase. The actual values will be conveyed by one subproperty per alternating current phase: L1, L2 and L3- Attribute type: Property. StructuredValue
- Allowed values: A number between -1 and 1.
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
measurementType
: How the measurement was made. (see beginning of document for details)- type: Text
measurementInterval
: For certain measurement types the measurement period. (See beginning of document for details)- type: Number
onlyPositive
: Is the value always greater than zero or can it also be negative. If not present this is assumed to be false.- Type: Boolean
- Optional
-
totalDisplacementPowerFactor
: Displacement power factor including all phases. The quantity is based on the fundamental frequency of the system- Attribute type: Property. Number
- Allowed values: A number between -1 and 1.
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
measurementType
: How the measurement was made. (see beginning of document for details)- type: Text
measurementInterval
: For certain measurement types the measurement period. (See beginning of document for details)- type: Number
onlyPositive
: Is the value always greater than zero or can it also be negative. If not present this is assumed to be false.- Type: Boolean
- Optional
-
displacementPowerFactor
: Displacement power factor for each phase. The quantity is based on the fundamental frequency of the system. The actual values will be conveyed by one subproperty per alternating current phase: L1, L2 and L3- Attribute type: Property. StructuredValue
- Allowed values: A number between -1 and 1.
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
measurementType
: How the measurement was made. (see beginning of document for details)- type: Text
measurementInterval
: For certain measurement types the measurement period. (See beginning of document for details)- type: Number
onlyPositive
: Is the value always greater than zero or can it also be negative. If not present this is assumed to be false.- Type: Boolean
- Optional
-
current
: Electrical current. The actual values will be conveyed by one subproperty per alternating current phase and the neutral wire: L1, L2, L3 and N.- Attribute type: Property. StructuredValue
- Default unit: Ampers (A)
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
measurementType
: How the measurement was made. (see beginning of document for details)- type: Text
measurementInterval
: For certain measurement types the measurement period. (See beginning of document for details)- type: Number
- Optional
-
phaseVoltage
: The voltage between each phase and neutral conductor. The actual values will be conveyed by one subproperty per alternating current phase: L1, L2 and L3- Attribute type: Property. StructuredValue
- Default unit: Volts (V)
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
measurementType
: How the measurement was made. (see beginning of document for details)- type: Text
measurementInterval
: For certain measurement types the measurement period. (See beginning of document for details)- type: Number
- Optional
-
phaseToPhaseVoltage
: Voltage between phases. A value for each phase pair: phases 1 and 2 (L12), phases 2 and 3 (L32), phases 3 and 1 (L31).- Attribute type: Property. StructuredValue
- Default unit: Volts (V)
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
measurementType
: How the measurement was made. (see beginning of document for details)- type: Text
measurementInterval
: For certain measurement types the measurement period. (See beginning of document for details)- type: Number
- Optional
-
thdVoltage
: Total harmonic distortion of voltage for each phase. The actual values will be conveyed by one subproperty per alternating current phase: L1, L2 and L3- Attribute type: Property. StructuredValue
- Allowed values: A number between 0 and 1.
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
measurementType
: How the measurement was made. (see beginning of document for details)- type: Text
measurementInterval
: For certain measurement types the measurement period. (See beginning of document for details)- type: Number
- Optional
-
thdCurrent
: Total harmonic distortion of electrical current. The actual values will be conveyed by one subproperty per alternating current phase: L1, L2 and L3- Attribute type: Property. StructuredValue
- Allowed values: A number between 0 and 1.
- Attribute metadata:
timestamp
: Timestamp when the last update of the attribute happened.- Type: DateTime
measurementType
: How the measurement was made. (see beginning of document for details)- type: Text
measurementInterval
: For certain measurement types the measurement period. (See beginning of document for details)- type: Number
- Optional
Note: JSON Schemas are intended to capture the data type and associated constraints of the different Attributes, regardless their final representation format in NGSI(v2, LD).
Examples
Normalized Example
Normalized NGSI response
{
"id": "ThreePhaseAcMeasurement:LV3_Ventilation",
"type": "ThreePhaseAcMeasurement",
"dateEnergyMeteringStarted": {
"type": "DateTime",
"value": "2018-07-07T15:05:59.408Z"
},
"refDevice": {
"type": "Relationship",
"value": ["Device:eQL-EDF3GL-2006201705"]
},
"name": {
"value": "HKAPK0200"
},
"description": {
"value": "measurement corresponding to the ventilation machine rooms"
},
"totalActiveEnergyImport": {
"metadata": {
"timestamp": {
"type": "DateTime",
"value": "2019-01-24T22:00:00.173Z"
}
},
"value": 150781.96448
},
"totalReactiveEnergyImport": {
"metadata": {
"timestamp": {
"type": "DateTime",
"value": "2019-01-24T22:00:00.173Z"
}
},
"value": 20490.3392
},
"totalActiveEnergyExport": {
"metadata": {
"timestamp": {
"type": "DateTime",
"value": "2019-01-24T22:00:00.173Z"
}
},
"value": 1059.80176
},
"totalReactiveEnergyExport": {
"metadata": {
"timestamp": {
"type": "DateTime",
"value": "2019-01-24T22:00:00.173Z"
}
},
"value": 93275.02176
},
"totalActivePower": {
"metadata": {
"timestamp": {
"type": "DateTime",
"value": "2019-01-24T22:00:00.173Z"
},
"measurementType": {
"value": "average"
},
"measurementInterval": {
"value": 1
}
},
"value": 31700.269531
},
"activePower": {
"metadata": {
"timestamp": {
"type": "DateTime",
"value": "2019-01-24T22:00:00.173Z"
},
"measurementType": {
"value": "average"
},
"measurementInterval": {
"value": 1
}
},
"type": "StructuredValue",
"value": {
"L1": 11996.416016,
"L2": 9461.501953,
"L3": 10242.351562
}
},
"totalReactivePower": {
"metadata": {
"timestamp": {
"type": "DateTime",
"value": "2019-01-24T22:00:00.173Z"
},
"measurementType": {
"value": "average"
},
"measurementInterval": {
"value": 1
}
},
"value": -7830.332031
},
"reactivePower": {
"metadata": {
"timestamp": {
"type": "DateTime",
"value": "2019-01-24T22:00:00.173Z"
},
"measurementType": {
"value": "average"
},
"measurementInterval": {
"value": 1
}
},
"type": "StructuredValue",
"value": {
"L1": -2612.606934,
"L2": -2209.906006,
"L3": -3007.81958
}
},
"totalApparentPower": {
"metadata": {
"timestamp": {
"type": "DateTime",
"value": "2019-01-24T22:00:00.173Z"
},
"measurementType": {
"value": "average"
},
"measurementInterval": {
"value": 1
}
},
"value": 36019.089844
},
"apparentPower": {
"metadata": {
"timestamp": {
"type": "DateTime",
"value": "2019-01-24T22:00:00.173Z"
},
"measurementType": {
"value": "average"
},
"measurementInterval": {
"value": 1
}
},
"type": "StructuredValue",
"value": {
"L1": 13201.412109,
"L2": 10755.304688,
"L3": 11941.094727
}
},
"powerFactor": {
"metadata": {
"timestamp": {
"type": "DateTime",
"value": "2019-01-24T22:00:00.173Z"
},
"measurementType": {
"value": "average"
},
"measurementInterval": {
"value": 1
},
"onlyPositive": {
"value": true
}
},
"type": "StructuredValue",
"value": {
"L1": 0.908817,
"L2": 0.879906,
"L3": 0.859293
}
},
"displacementPowerFactor": {
"metadata": {
"timestamp": {
"type": "DateTime",
"value": "2019-01-24T22:00:00.173Z"
},
"measurementType": {
"value": "average"
},
"measurementInterval": {
"value": 1
},
"onlyPositive": {
"value": true
}
},
"type": "StructuredValue",
"value": {
"L1": 0.978013,
"L2": 0.973317,
"L3": 0.960382
}
},
"frequency": {
"metadata": {
"timestamp": {
"type": "DateTime",
"value": "2019-01-24T22:00:00.173Z"
},
"measurementType": {
"value": "average"
},
"measurementInterval": {
"value": 1
}
},
"value": 50.020672
},
"current": {
"metadata": {
"timestamp": {
"type": "DateTime",
"value": "2019-01-24T22:00:00.173Z"
},
"measurementType": {
"value": "rms"
},
"measurementInterval": {
"value": 1
}
},
"type": "StructuredValue",
"value": {
"L1": 56.126038,
"L2": 45.894356,
"L3": 50.872452,
"N": 0.0
}
},
"phaseVoltage": {
"metadata": {
"timestamp": {
"type": "DateTime",
"value": "2019-01-24T22:00:00.173Z"
},
"measurementType": {
"value": "rms"
},
"measurementInterval": {
"value": 1
}
},
"type": "StructuredValue",
"value": {
"L1": 234.961304,
"L2": 234.563477,
"L3": 235.354034
}
},
"phaseToPhaseVoltage": {
"metadata": {
"timestamp": {
"type": "DateTime",
"value": "2019-01-24T22:00:00.173Z"
},
"measurementType": {
"value": "rms"
},
"measurementInterval": {
"value": 1
}
},
"type": "StructuredValue",
"value": {
"L12": 406.769196,
"L23": 407.081238,
"L31": 407.734558
}
},
"thdVoltage": {
"metadata": {
"timestamp": {
"type": "DateTime",
"value": "2019-01-24T22:00:00.173Z"
},
"measurementType": {
"value": "average"
},
"measurementInterval": {
"value": 1
}
},
"type": "StructuredValue",
"value": {
"L1": 0.01471114,
"L2": 0.01600046,
"L3": 0.01541459
}
},
"thdCurrent": {
"metadata": {
"timestamp": {
"type": "DateTime",
"value": "2019-01-24T22:00:00.173Z"
},
"measurementType": {
"value": "average"
},
"measurementInterval": {
"value": 1
}
},
"type": "StructuredValue",
"value": {
"L1": 0.38497337,
"L2": 0.45807529,
"L3": 0.4938652
}
}
}
key-value pairs Example
Sample uses simplified representation for data consumers ?options=keyValues
{
"id": "ThreePhaseAcMeasurement:LV3_Ventilation",
"type": "ThreePhaseAcMeasurement",
"dateEnergyMeteringStarted": "2018-07-07T15:05:59.408Z",
"refDevice": ["Device:eQL-EDF3GL-2006201705"],
"name": "HKAPK0200",
"description": "measurement corresponding to the ventilation machine rooms",
"totalActiveEnergyImport": 150781.96448,
"totalReactiveEnergyImport": 20490.3392,
"totalActiveEnergyExport": 1059.80176,
"totalReactiveEnergyExport": 93275.02176,
"totalActivePower": 31700.269531,
"activePower": {
"L1": 11996.416016,
"L2": 9461.501953,
"L3": 10242.351562
},
"totalReactivePower": -7830.332031,
"reactivePower": {
"L1": -2612.606934,
"L2": -2209.906006,
"L3": -3007.81958
},
"totalApparentPower": 36019.089844,
"apparentPower": {
"L1": 13201.412109,
"L2": 10755.304688,
"L3": 11941.094727
},
"powerFactor": {
"L1": 0.908817,
"L2": 0.879906,
"L3": 0.859293
},
"displacementPowerFactor": {
"L1": 0.978013,
"L2": 0.973317,
"L3": 0.960382
},
"frequency": 50.020672,
"current": {
"L1": 56.126038,
"L2": 45.894356,
"L3": 50.872452,
"N": 0.0
},
"phaseVoltage": {
"L1": 234.961304,
"L2": 234.563477,
"L3": 235.354034
},
"phaseToPhaseVoltage": {
"L12": 406.769196,
"L23": 407.081238,
"L31": 407.734558
},
"thdVoltage": {
"L1": 0.01471114,
"L2": 0.01600046,
"L3": 0.01541459
},
"thdCurrent": {
"L1": 0.38497337,
"L2": 0.45807529,
"L3": 0.4938652
}
}
LD Example
Sample uses the NGSI-LD representation
{
"id": "urn:ngsi-ld:ThreePhaseAcMeasurement:ThreePhaseAcMeasurement:LV3_Ventilation",
"type": "ThreePhaseAcMeasurement",
"dateEnergyMeteringStarted": {
"type": "Property",
"value": {
"@type": "DateTime",
"@value": "2018-07-07T15:05:59.408Z"
}
},
"refDevice": {
"type": "Relationship",
"object": ["urn:ngsi-ld:Device:Device:eQL-EDF3GL-2006201705"]
},
"name": {
"type": "Property",
"value": "HKAPK0200"
},
"description": {
"type": "Property",
"value": "measurement corresponding to the ventilation machine rooms"
},
"totalActiveEnergyImport": {
"type": "Property",
"value": 150781.96448,
"observedAt": "2019-01-24T22:00:00.173Z"
},
"totalReactiveEnergyImport": {
"type": "Property",
"value": 20490.3392,
"observedAt": "2019-01-24T22:00:00.173Z"
},
"totalActiveEnergyExport": {
"type": "Property",
"value": 1059.80176,
"observedAt": "2019-01-24T22:00:00.173Z"
},
"totalReactiveEnergyExport": {
"type": "Property",
"value": 93275.02176,
"observedAt": "2019-01-24T22:00:00.173Z"
},
"totalActivePower": {
"type": "Property",
"value": 31700.269531,
"observedAt": "2019-01-24T22:00:00.173Z",
"measurementType": {
"type": "Property",
"value": "average"
},
"measurementInterval": {
"type": "Property",
"value": 1
}
},
"activePower": {
"type": "Property",
"value": {
"L1": 11996.416016,
"L2": 9461.501953,
"L3": 10242.351562
},
"observedAt": "2019-01-24T22:00:00.173Z",
"measurementType": {
"type": "Property",
"value": "average"
},
"measurementInterval": {
"type": "Property",
"value": 1
}
},
"totalReactivePower": {
"type": "Property",
"value": -7830.332031,
"observedAt": "2019-01-24T22:00:00.173Z",
"measurementType": {
"type": "Property",
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