Transmission and Distribution Line

And Substation Infrastructures

SETBACKS & WAYLEAVE CORRIDORS SETBACKS & WAYLEAVE CORRIDORS - EXISTING & FUTURE INSTALLATION

CONCEPTS

SABAH ELECTRICITY SDN BHD

Sabah Power Grid Network System

Concepts of Electrical Grid System

GENERATION

TRANSMISSIONTRANSMISSION

DISTRIBUTION

CONSUMERS

Regulatory Requirements & Prudent Utility Practices

1. Meet Regulatory Requirements & Prudent Utility Practices

i. Electricity Supply Act 1990

ii. Electricity Regulation 1994

iii. EC Malaysia Way-leave Guidelines

iv. SESB Electricity Supply Application Handbook (2008)

v. SESB Safety Rules and Design Specifications

2. Design & develop electrical system infrastructures in an

economical way considering safety, security, efficiency

and reliability of power supply.

Requirement Under The Act/Regulations

Ensure safety of person and security of the supply lines, theElectricity Supply Act 1990 and the Electricity Regulations 1994stipulate the following provisions:

1. No person shall without lawful authority of the supply authority of thelicensee, undertake any work or engage in any activity in the vicinity ofany electrical installation or part of thereof in a manner likely to interfereany electrical installation or part of thereof in a manner likely to interferewith any electrical installation or to cause danger to any person orproperty.

2. The minimum clearances from ground for supply lines shall be asshown in following tables.

3. The minimum clearance of any building or structures from high voltagesupply lines, apart from a substation building, must not be less than 4.57metres.

Minimum Ground Clearance for Transmission Lines

Operating Voltage

of the Lines

Clearance from Ground

(As provided for in the Electricity Regulations 1994)

Over roads

(metres)

Other than over roads

(metres)

In positions inaccessible

to vehicular traffic

(metres)

66kV 6.1 6.1 5.18

132kV 6.7 6.7 5.79132kV 6.7 6.7 5.79

275kV 7.0 7.0 7.0

500kV 7.3 7.3 7.3

* Ensure that trees or plants grown under or in the vicinity of the high voltage electricity

supply lines are less than 2.4 metres in height

Minimum clearance of any building or structures from high voltage supply lines,

apart from a substation building, must not be less than 4.57 metres.

Minimum Ground Clearance for Distribution Line –Up to 33kV

Operating Voltage

of the Lines

Clearance from Ground

(As provided for in the Electricity Regulations 1994)

Over roads

(metres)

Other than over roads

(metres)

In positions inaccessible

to vehicular traffic

(metres)(metres)

415V

11kV

33kV

5.49

5.79

5.18

5.49

4.57

4.88

* Ensure that trees or plants grown under or in the vicinity of the high voltage electricity

supply lines are less than 2.4 metres in height

Minimum clearance of any building or structures from high voltage supply lines,

apart from a substation building, must not be less than 4.57 metres.

REASONS FOR SETBACKS/BUFFER ZONES

a) Reduce the potential for future incompatible

land use conflicts

b) Restrict the future development of sensitive land

uses in close proximity to existing or proposed

distribution & transmission infrastructures

c) Meet Regulatory Requirements

FUTURE KOTA KINABALU ELECTRICAL TRANSMISSION SYSTEM

Typical Transmission Overhead Line Structures

Typical Right of Way For Overhead Line Structures

20m 20m

Pole Structure for Transmission Line

Close-up of the Base of an

Angle Structure

Typical Future Transmission Overhead Steel

/ Concrete Pole Structure

Typical Right of Way For

Overhead Steel / Concrete Pole Structure

20m 20m

Tower or Pole

Red Zone – measured 12m either

side of transmission line +

distance around structure and

Future Typical Right of Way For Transmission Overhead Line Structures

distance around structure and

conductor swing

Orange Zone – measured 20m

either of the red zone

Green Zone – beyond the

orange zone

Typical Transmission Underground Cable System Infrastructure

Wayleave Corridors for Transmission

Underground Cable SystemCorridor for

underground Cable

Road Shoulder / Perimeter Drain

ARoad

No Voltage System Corridor for Underground

Cable from Road Shoulder / Cable from Road Shoulder / Perimeter Drain (A)

1 275 kV System 5 m

2 132/66 kV System 3 m

SESB Cable Gas/Water/Telco. pipe

2m

3m

Ground Surface

Typical GIS Building

Indoor Gas Insulated

Switchgear Building

Future Underground GIS substation

Use of gas-insulated switchgear allowed the 132-kV transformer substation in the center of Kota Kinabalu to be constructed underground and a park built over

it which harmonizes with the surroundings. The sound of the waterfall, which acts as a heat-exchanger, hides the noise made by the fans.

Wayleave Requirement for SESB

Distribution Overhead Line

A BRoad Shoulder /

Perimeter DrainBuilding Structure /

Plants

No Type of conductor Wayleave

Distance A

Wayleave

Distance B

1 Aerial Bundled Cable (ABC) – 33 kV 2 m 5 m

2 Aerial Bundled Cable (ABC) – 11 kV 2 m 2 m

3 Overhead Line (Bare) – 33 kV 3 m 6 m

4 Overhead Line (Bare) – 11 kV 3 m 3 m

5 Overhead Line (Lattice Tower) – 33 kV 8 m 8 m

Wayleave Corridors for Distribution

Underground Cable SystemCorridor for

underground Cable

Road Shoulder / Perimeter Drain

ARoad

No Voltage System Corridor for Underground

Cable from Road Shoulder / Cable from Road Shoulder / Perimeter Drain (A)

1 33 kV System 2 m

2 11 kV System 1.5 m

SESB Cable Gas/Water/Telco. pipe

1.2m

2m

Ground Surface

Distance

@

Building / Structure PPU/PE SESB

Building / Sewerage Sewerage Pond Garbage Waste

Wayleave Requirement for Distribution Substation

Building / Structure

SeweragePump House

Sewerage Pond Garbage Collection

Center

Waste Disposal Center

PPU 50m 250m 50m 500m

PE 30m 100m 50m 100m

Building / Structure

Slope Upward (withretaining wall)

Slope Downward (withretaining wall)

River Ocean

PPU 10m 30m 50m 250m

PE 10m 30m 50m 100m

Typical Setback for Distribution Substation

Typical Substation Land and Building Sizes Requirements

Substation Category

Type Land Size (Building Size)

Building Design

PencawangMasuk Utama

(PMU)

Gas Insulated Switchgear (GIS) without outdoor switchyard

a) 132/33/11kVb) 275/132/33kV

1.5 acres2 acres

Customized design subject to SESB approval

Conventional Outdoor AISa) 132/33/11kVb) 275/132/33kV

8 acres20 acres

PencawangPenurun Utama

Indoor Type 45 m x 45 m(23 m x 29 m)

Customized design subject to SESB approval

Penurun Utama(PPU)

– 33/11kV

(23 m x 29 m)

Outdoor Switchyard Subject to SESB approval

Main SwitchingSubstation (SSU)

– 33kV & 11kV

(a) Conventional (33kV) 33 mx 22 m(21 m x 10 m)

Customized design subject to SESB approval (with inclusion of meter room)

(b) Conventional (11kV) 20 m x 14 m(8 m x 6 m)

DistributionSubstation (PE) – 11/0.400kV

(a) Single transformer substation 14 m x 18 m(8 m x 6 m)

According to SESB design

(b) Double transformer substation 17 m x 18 m(11 m x 6 m)

(c) Compact Substation Subject to SESB approval

For special case application

(d) Outdoor Substation 6 m x 6 m Limited to those located in the rural areas.

Future Challenges & Moving Forward

A long-term planning, strategic line route and line corridor

selection and setbacks :

� With a changed and more focused approach

� With clearer governmental strategy/plan for SESB Projects� With clearer governmental strategy/plan for SESB Projects

The issue of incompatible land uses between high voltage

transmission and distribution lines, substations and sensitive land

uses could be addressed by creating buffer zones that apply to

future development areas to be implemented in the next update

of the Kota Kinabalu Local Plan 2020 and Structural Plan 2030

and Land Use Bylaw review.

THANK YOU FOR YOUR ATTENTION