Long Term Development Statement (LTDS) Table 2b Transformer Data - 3W

Introduction

The Long Term Development Statements (LTDS) report on a 0-5 year period, describing a forecast of load on the network and envisioned network developments. The LTDS is published at the end of May and November each year.

This is Table 2b from our current LTDS report (published 29 November 2024), showing the Transformer information for three winding (1x High Voltage, 2x Low Voltage) transformers associated to each Grid and Primary substation where applicable.

More information and full reports are available from the landing page below:
Long Term Development Statement and Network Development Plan Landing Page

Methodological Approach

Site Functional Locations (FLOCs) are used to associate the Substation which the transformer is located to Key characteristics of active Grid and Primary sites — UK Power Networks
ID field added to identify row number for reference purposes

Quality Control Statement

Quality Control Measures include:

Verification steps to match features only with confirmed functional locations.
Manual review and correction of data inconsistencies.
Use of additional verification steps to ensure accuracy in the methodology.

Assurance Statement

The Open Data Team and Network Insights Team worked together to ensure data accuracy and consistency.

Other

Download dataset information: Metadata (JSON)

Definitions of key terms related to this dataset can be found in the Open Data Portal Glossary: https://ukpowernetworks.opendatasoft.com/pages/glossary/

Attachments

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Data Triage - Long Term Development Statement.xlsx

Dataset schema

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ID

No description available for this field.

Name (identifier)	id
Type	integer
Sample

LicenceArea

This holds the Licence Area or DNO (Distribution Network Operator) name

No description available for this field.

Name (identifier)	licencearea
Type	text
Sample

GridSupplyPoint

This is the point of delivery from the transmission system to a distribution system

No description available for this field.

Name (identifier)	gridsupplypoint
Type	text
Sample

HV_Node

No description available for this field.

Name (identifier)	hv_node
Type	text
Sample

HV_Substation

The Name of the Site as per the UK Power Networks Control and Asset Management System

No description available for this field.

Name (identifier)	hv_substation
Type	text
Sample

Voltage_HV (kV)

Highest voltage on the site

No description available for this field.

Name (identifier)	voltage_hv
Type	text
Unit	kV
Sample

LV_Node_1

No description available for this field.

Name (identifier)	lv_node_1
Type	text
Sample

LV_Substation_1

The Name of the Site as per the UK Power Networks Control and Asset Management System

No description available for this field.

Name (identifier)	lv_substation_1
Type	text
Sample

Voltage_LV_1 (kV)

Highest voltage on the LV1 site

No description available for this field.

Name (identifier)	voltage_lv_1
Type	text
Unit	kV
Sample

SiteFunctionalLocation

No description available for this field.

Name (identifier)	sitefunctionallocation
Type	text
Sample

LV_Node_2

No description available for this field.

Name (identifier)	lv_node_2
Type	text
Sample

LV_Substation_2

The Name of the Site as per the UK Power Networks Control and Asset Management System

No description available for this field.

Name (identifier)	lv_substation_2
Type	text
Sample

Voltage_LV_2 (kV)

Highest voltage on the LV2 site

No description available for this field.

Name (identifier)	voltage_lv_2
Type	text
Unit	kV
Sample

Vector_Group_HV

Vector Group HV Side

No description available for this field.

Name (identifier)	vector_group_hv
Type	text
Sample

Vector_Group_LV1

Vector Group LV Side Winding 1

No description available for this field.

Name (identifier)	vector_group_lv1
Type	text
Sample

Vector_Group_LV2

Vector Group LV Side Winding 2

No description available for this field.

Name (identifier)	vector_group_lv2
Type	text
Sample

Positive_Sequence_Impedance_R_HV_LV1_Percent

Tx Positive Sequence Resistance HV to LV Winding 1

No description available for this field.

Name (identifier)	positive_sequence_impedance_r_hv_lv1_percent
Type	decimal
Unit	%
Sample

Positive_Sequence_Impedance_R_HV_LV2_Percent

Tx Positive Sequence Resistance HV to LV Winding 2

No description available for this field.

Name (identifier)	positive_sequence_impedance_r_hv_lv2_percent
Type	decimal
Unit	%
Sample

Positive_Sequence_Impedance_R_LV1_LV2_Percent

Tx Positive Sequence Resistance LV Winding 1 to LV Winding 2

No description available for this field.

Name (identifier)	positive_sequence_impedance_r_lv1_lv2_percent
Type	decimal
Unit	%
Sample

Positive_Sequence_Impedance_X_HV_LV1_Percent

No description available for this field.

Name (identifier)	positive_sequence_impedance_x_hv_lv1_percent
Type	decimal
Sample

Positive_Sequence_Impedance_X_LV1_LV2_Percent

No description available for this field.

Name (identifier)	positive_sequence_impedance_x_lv1_lv2_percent
Type	decimal
Sample

Positive_Sequence_Impedance_X_HV_LV2_Percent

No description available for this field.

Name (identifier)	positive_sequence_impedance_x_hv_lv2_percent
Type	decimal
Sample

Zero_Sequence_Impedance_X_HV_LV1_Percent

Tx Zero Sequence Reactance HV Winding to LV Winding 1

No description available for this field.

Name (identifier)	zero_sequence_impedance_x_hv_lv1_percent
Type	decimal
Unit	%
Sample

Zero_Sequence_Impedance_X_HV_LV2_Percent

Tx Zero Sequence Reactance HV Winding to LV Winding 2

No description available for this field.

Name (identifier)	zero_sequence_impedance_x_hv_lv2_percent
Type	decimal
Unit	%
Sample

Zero_Sequence_Impedance_X_LV1_LV2_Percent

Tx Zero Sequence Reactance LV Winding 1 to LV Winding 2

No description available for this field.

Name (identifier)	zero_sequence_impedance_x_lv1_lv2_percent
Type	decimal
Unit	%
Sample

Tap_Range_Min_Percent_HV

Minimum HV Tx Tap Range

No description available for this field.

Name (identifier)	tap_range_min_percent_hv
Type	integer
Unit	%
Sample

Tap_Range_Min_Percent_LV1

Minimum LV1 Tx Tap Range

No description available for this field.

Name (identifier)	tap_range_min_percent_lv1
Type	integer
Unit	%
Sample

Tap_Range_Min_Percent_LV2

Minimum LV2 Tx Tap Range

No description available for this field.

Name (identifier)	tap_range_min_percent_lv2
Type	integer
Unit	%
Sample

Tap_Range_Max_Percent_HV

Maximum HV Tx Tap Range

No description available for this field.

Name (identifier)	tap_range_max_percent_hv
Type	integer
Unit	%
Sample

Tap_Range_Max_Percent_LV1

Maximum LV1 Tx Tap Range

No description available for this field.

Name (identifier)	tap_range_max_percent_lv1
Type	integer
Unit	%
Sample

Tap_Range_Max_Percent_LV2

Maximum LV2 Tx Tap Range

No description available for this field.

Name (identifier)	tap_range_max_percent_lv2
Type	integer
Unit	%
Sample

Transformer_Rating_MVA_Summer_HV

Tx HV Rating Summer

No description available for this field.

Name (identifier)	transformer_rating_mva_summer_hv
Type	integer
Sample

Transformer_Rating_MVA_Winter_HV

Tx HV Rating Winter

No description available for this field.

Name (identifier)	transformer_rating_mva_winter_hv
Type	integer
Sample

Transformer_Rating_MVA_Summer_LV1

Tx LV1 Rating Summer

No description available for this field.

Name (identifier)	transformer_rating_mva_summer_lv1
Type	integer
Sample

Transformer_Rating_MVA_Winter_LV1

Tx LV1 Rating Winter

No description available for this field.

Name (identifier)	transformer_rating_mva_winter_lv1
Type	integer
Sample

Transformer_Rating_MVA_Summer_LV2

Tx LV2 Rating Summer

No description available for this field.

Name (identifier)	transformer_rating_mva_summer_lv2
Type	integer
Sample

Transformer_Rating_MVA_Winter_LV2

Tx LV2 Rating Winter

No description available for this field.

Name (identifier)	transformer_rating_mva_winter_lv2
Type	integer
Sample

Reverse_Power_Capability_Percent

Reverse Power Capability

No description available for this field.

Name (identifier)	reverse_power_capability_percent
Type	text
Sample

Method_of_Earthing_HV

Tx HV Side Earth Method

No description available for this field.

Name (identifier)	method_of_earthing_hv
Type	text
Sample

Method_of_Earthing_LV1

No description available for this field.

Name (identifier)	method_of_earthing_lv1
Type	text
Sample

Method_of_Earthing_LV2

Tx LV2 Side Earth Method

No description available for this field.

Name (identifier)	method_of_earthing_lv2
Type	text
Sample

JSON Schema

The following JSON object is a standardized description of your dataset's schema. More about JSON schema.

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    "licencearea":
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    "type":"string",
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    ,
    "gridsupplypoint":
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    "description":"Tx Positive Sequence Resistance HV to LV Winding 1",
    "unit":"%"
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    "title":"Positive_Sequence_Impedance_R_HV_LV2_Percent",
    "description":"Tx Positive Sequence Resistance HV to LV Winding 2",
    "unit":"%"
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    "description":"Tx Positive Sequence Resistance LV Winding 1 to LV Winding 2",
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    ,
    "positive_sequence_impedance_x_hv_lv1_percent":
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    "title":"Positive_Sequence_Impedance_X_HV_LV1_Percent",
    "description":""
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    ,
    "positive_sequence_impedance_x_lv1_lv2_percent":
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    "description":""
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    ,
    "positive_sequence_impedance_x_hv_lv2_percent":
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    "type":"number",
    "title":"Positive_Sequence_Impedance_X_HV_LV2_Percent",
    "description":""
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    ,
    "zero_sequence_impedance_x_hv_lv1_percent":
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    "type":"number",
    "title":"Zero_Sequence_Impedance_X_HV_LV1_Percent",
    "description":"Tx Zero Sequence Reactance HV Winding to LV Winding 1",
    "unit":"%"
    }
    ,
    "zero_sequence_impedance_x_hv_lv2_percent":
    {
    "type":"number",
    "title":"Zero_Sequence_Impedance_X_HV_LV2_Percent",
    "description":"Tx Zero Sequence Reactance HV Winding to LV Winding 2",
    "unit":"%"
    }
    ,
    "zero_sequence_impedance_x_lv1_lv2_percent":
    {
    "type":"number",
    "title":"Zero_Sequence_Impedance_X_LV1_LV2_Percent",
    "description":"Tx Zero Sequence Reactance LV Winding 1 to LV Winding 2",
    "unit":"%"
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    ,
    "tap_range_min_percent_hv":
    {
    "type":"integer",
    "title":"Tap_Range_Min_Percent_HV",
    "description":"Minimum HV Tx Tap Range",
    "unit":"%"
    }
    ,
    "tap_range_min_percent_lv1":
    {
    "type":"integer",
    "title":"Tap_Range_Min_Percent_LV1",
    "description":"Minimum LV1 Tx Tap Range",
    "unit":"%"
    }
    ,
    "tap_range_min_percent_lv2":
    {
    "type":"integer",
    "title":"Tap_Range_Min_Percent_LV2",
    "description":"Minimum LV2 Tx Tap Range",
    "unit":"%"
    }
    ,
    "tap_range_max_percent_hv":
    {
    "type":"integer",
    "title":"Tap_Range_Max_Percent_HV",
    "description":"Maximum HV Tx Tap Range",
    "unit":"%"
    }
    ,
    "tap_range_max_percent_lv1":
    {
    "type":"integer",
    "title":"Tap_Range_Max_Percent_LV1",
    "description":"Maximum LV1 Tx Tap Range",
    "unit":"%"
    }
    ,
    "tap_range_max_percent_lv2":
    {
    "type":"integer",
    "title":"Tap_Range_Max_Percent_LV2",
    "description":"Maximum LV2 Tx Tap Range",
    "unit":"%"
    }
    ,
    "transformer_rating_mva_summer_hv":
    {
    "type":"integer",
    "title":"Transformer_Rating_MVA_Summer_HV",
    "description":"Tx HV Rating Summer"
    }
    ,
    "transformer_rating_mva_winter_hv":
    {
    "type":"integer",
    "title":"Transformer_Rating_MVA_Winter_HV",
    "description":"Tx HV Rating Winter"
    }
    ,
    "transformer_rating_mva_summer_lv1":
    {
    "type":"integer",
    "title":"Transformer_Rating_MVA_Summer_LV1",
    "description":"Tx LV1 Rating Summer"
    }
    ,
    "transformer_rating_mva_winter_lv1":
    {
    "type":"integer",
    "title":"Transformer_Rating_MVA_Winter_LV1",
    "description":"Tx LV1 Rating Winter"
    }
    ,
    "transformer_rating_mva_summer_lv2":
    {
    "type":"integer",
    "title":"Transformer_Rating_MVA_Summer_LV2",
    "description":"Tx LV2 Rating Summer"
    }
    ,
    "transformer_rating_mva_winter_lv2":
    {
    "type":"integer",
    "title":"Transformer_Rating_MVA_Winter_LV2",
    "description":"Tx LV2 Rating Winter"
    }
    ,
    "reverse_power_capability_percent":
    {
    "type":"string",
    "title":"Reverse_Power_Capability_Percent",
    "description":"Reverse Power Capability"
    }
    ,
    "method_of_earthing_hv":
    {
    "type":"string",
    "title":"Method_of_Earthing_HV",
    "description":"Tx HV Side Earth Method"
    }
    ,
    "method_of_earthing_lv1":
    {
    "type":"string",
    "title":"Method_of_Earthing_LV1",
    "description":""
    }
    ,
    "method_of_earthing_lv2":
    {
    "type":"string",
    "title":"Method_of_Earthing_LV2",
    "description":"Tx LV2 Side Earth Method"
    }
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