Questionaires to MEA

7/30/2019 Questionaires to MEA

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Questionnaires to MEA

1.1Distribution supply areaAREA 3,194.81 km

2

LOAD DEMAND 8,382.83 MW

LOAD DENSITY 2.40 MW/km2

Number of customer 3,158,131 Customers

1.2Distribution facilities ( for example transformer, optical fiber, system and so on )TRANSFORMERS

- TERMINAL STATION 230/69-115 kV ( 17 STATIONS) 18,205.88 MVA

- SUBSTATION 69-115/12-24 kV ( 149 STATIONS ) 18,405.00 MVA

- DISTRIBUTION 12-24 kV/230-380 V 14,148.68 MVA

TRANSMISSION LINES

- 230 kV ( 6 LINES ) 49.54 cct-km

- 115 kV ( 38 LINES ) 722.75 cct-km

- 69 kV ( 77 LINES ) 897.88 cct-km

DISTRIBUTION LINES

- 24 kV ( 1,156 LINES ) 12,829.52 cct-km

- 12 kV ( 464 LINES ) 4,279.18 cct-km

- Low voltage 27,211.83 cct-km

OPTICAL FIBER

- ADSS Structure Cable 10,000.00 cct-km

Update : 08/2012


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1.5 Quality of Power Supply (Restriction for Frequency fluctuation of power supply and voltage drop)

MEA Quality of Electricity Supply for 69, 115 and 230 kV System

Item Value Note

Frequency 50 0.5 Hz (normal operation) Data from EGAT

Voltage supply

230 kV218.0 - 237.0 kV (normal)

218.0 - 242.0 kV (emergency)

115 kV106.4 - 117.6 kV (normal)

96.0 - 123.0 kV (emergency)

69 kV63.6 - 70.4 kV (normal)


Harmonic

voltageTHDv less than 3.0 %

Refer to planning level in Engineering

Recommendation G5/4 table 4 and 5

which also include individual harmonic

Voltage

flicker

Pst less than 0.8 Refer to planning level in IEC 61000-3-

7Plt less than 0.6

Voltage

unbalanceLess than 1.4 %

Refer to planning level in IEC 61000-3-

13

Temp. powerfrequency

overvoltage

Less than 173.2 % of nominal voltage Refer to EN 50160

Note: The specified value of harmonics, flicker and unbalance are planning level. MEA try to control

these disturbances in power system which generated from the operation of customer load to be within

the planning level. But due to the diversification of customer load and some uncontrolled circumstance,

the levels of these disturbances maybe exceed the specified value above in some duration or some area.

So customers should design their equipment to operate in environment that disturbances can be up to

compatibility level which generally higher than planning level. Compatibility levels for harmonics, flicker

and unbalance are shown in above reference standards.


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MEA Connection Regulation for 69, 115 and 230 kV System

Item Condition or Limit Note

Load size

230 kV not available

Depend on specific area115 kV larger than 15 MVA

69 kV larger than 15 MVA

Maximum step

voltage change

Max. step voltage change at PCC due to

customer load variation must less than 3.0 %

of nominal voltage

Power factor Between 0.9 - 1.0 lagging

Harmonic

current

Limit individual harmonic current up to order

50th

. The limits depend on load size, systemcapacity and fault level at PCC.

Refer to planning level from

Engineering Recommendation G5/4

and assessment method from IEC

61000-3-6

Voltage

flicker

Limit Pst and Plt created by customer at PCC.

The limits depend on load size and system

capacity.

Refer to assessment method from IEC

61000-3-7

Unbalanced

current

Limit negative sequence current. The limit

depends on load size, system capacity and

fault level at PCC.


61000-3-13

Note: For traction load, the design criteria of the traction system shall be concern about EMC and safety

related to public vicinity by referring to the international standard.


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MEA Quality of Electricity Supply for 12 and 24 kV System

Item Value Note

Frequency 50 0.5 Hz (normal operation) Data from EGAT

Voltage supply

12 kV10.9 - 11.8 kV (normal)


24 kV21.8 - 23.6 kV (normal)


Harmonic

voltageTHDv less than 4.0 %

Refer to planning level in Engineering

Recommendation G5/4 table 3 which

also include individual harmonic

Voltage flicker Pst less than 0.9 Refer to planning level in IEC 61000-3-

7Plt less than 0.7

Voltage

unbalanceLess than 1.8 %

Refer to planning level in IEC 61000-3-

13

Temp. power

frequency

overvoltage

Less than 173.2 % of nominal voltage Refer to EN 50160

Note: The specified value of harmonics, flicker and unbalance are planning level. MEA try to controlthese disturbances in power system which generated from the operation of customer load to be within

the planning level. But due to the diversification of customer load and some uncontrolled circumstance,

the levels of these disturbances maybe exceed the specified value above in some duration or some area.

So customers should design their equipment to operate in environment that disturbances can be up to

compatibility level which generally higher than planning level. Compatibility levels for harmonics, flicker

and unbalance are shown in above reference standards.


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MEA Connection Regulation for 12 and 24 kV System

Item Condition or Limit Note

Load sizeLarger than 300 kVA

but smaller than 15 MVADepend on specific area

Power factor Between 0.9 - 1.0 lagging

Maximum step

voltage change

Max. step voltage change at PCC due to

customer load variation must less than 3.0 %

of nominal voltage

Harmonic

current

Limit individual harmonic current up to order

50th. The limits depend on load size, system

capacity and fault level at PCC.

Refer to planning level from

Engineering Recommendation G5/4

and assessment method from IEC

61000-3-6

Voltage flicker

Limit Pst and Plt created by customer at PCC.

The limits depend on load size and system

capacity.


61000-3-7

Unbalanced

current

Limit negative sequence current. The limit

depends on load size, system capacity and

fault level at PCC.


61000-3-13

Note: For traction load, the design criteria of the traction system shall be concern about EMC and safety

related to public vicinity by referring to the international standard.


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2.3 Current situation for Adder

FuelAdder

(Bath/kWh)

Years

effective

(Years)

1. Biomass

- Installation Capacity 1 MW 0.50 7

- Installation Capacity 1 > MW 0.30 7

2. Biogas

- Installation Capacity 1 MW 0.50 7

- Installation Capacity 1 > MW 0.30 7

3. Waste (Waste from communityor Waste from industry which is not both

dangeroussubstances and organic matters.)

- Fermentation or Landfill system 2.50 7

- Heat Energy 3.50 7

4. Wind Energy

- Installation Capacity 50 kW 4.50 10

- Installation Capacity 50 > kW 3.50 10

5. Very Small Hydropower

- 50 kW Installation Capacity 200kW 0.80 7

- Installation Capacity < 50kW 1.50 7

6. Solar Energy 8.00 or6.50 10


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4.1 Overview of the Very Small Power Producer

VSPP or Very Small Power Producer is a power generator of a private sector , state agency , state

owned enterprise or individual who generate and sell electrical power less than 10 MW to MEA or PEA.

Fuels which are used in a power generation process are solar energy , biogas and biomass energy ,

hydropower , natural gas and etc. The objectives for purchasing electrical power from VSPP are to support

an efficient use of resources and reduce pollution effect to the environment.

4.2 The number of VSPP

VSPP in MEA Area Fuel

Number Power(kW)

(project)Installation

Offer for

sale

(1) Projects that have been turned on the power

to MEA system. 43 11,677.58 8,419.58

Solar Energy 39 237.58 219.58

Waste 1 1,040.00 1,000.00

Very Small

Hydropower 2 800.00 800.00

Natural gas 1 9,600.00 6,400.00

(2)Projects that have already been signed but are

been setting the date of COD. 3 1,644.00 832.00

Solar Energy 2 44.00 32.00

Waste 1 1,600.00 800.00

(3) Projects that have already been admitted but

have not been signed yet. 2 10,200.00 10,200.00

Solar Energy 1 3,000.00 3,000.00

Natural gas 1 7,200.00 7,200.00

(4) Projects that are been considering. 2 7,000.00 4,200.00

Solar Energy 1 3,000.00 3,000.00

Natural gas 1 4,000.00 1,200.00

TOTAL 50 30,521.58 23,651.58

Update : 29/11/2012


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4.3 Condition or regulations to be authorized as VSPP

- Power Generation Using Renewable Energy ( attached 1 )

- Power Generation Using Cogeneration Energy ( attached 2 )

4.4 The procedure to be authorized as VSPP

According to regulations 2006 for the purchase of electrical power from VSPPs who sell electrical

power into MEA distribution grid less than 10 MW, there are 4 main issues required to consider ;

1. Procedures and criteria for consideration of power purchase from VSPPs.

2. Conditions for purchasing electrical power from VSPPs.

3. Power purchasing point and connection point.

4. Costs incurred for VSPPs.

4.5 Example of VSPP business

No. Company /

Person

Type of

fuel

Linking

voltage

Installation

capacity

( kW )

Offer

for sale

( kW )

Started

date

Adder

Rate

(Bath/kWh)

Duration

1Charoensompong

Ltd.Waste 24 kV 1,040.00 1,000.00 08/2007 2.50 08/07 07/14

2PTT Public

Co.,Ltd.

Solar

Energy400/230 V 43.73 43.73 10/2007 8.00 10/07 09/17

3Lard prao Water

Work

Very Small

Hydropower69 kV 480.00 480.00 12/2008 Not apply -

4

Combined Heat

& Power

Producing Ltd.

Natural gas 24 kV 9,600.00 6,400.00 11/2010 - -

5 Mr. Pirom JamsaiSolar

Energy400/230 V 2.50 2.50 08/2012 6.50 08/12 07/22

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Questionaires to MEA