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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)
57.3 - 72.5 kV (emergency)
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.
Refer to assessment method from IEC
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)
10.8 - 12.0 kV (emergency)
24 kV21.8 - 23.6 kV (normal)
21.6 - 24.0 kV (emergency)
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.
7/30/2019 Questionaires to MEA
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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.
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.
Refer to assessment method from IEC
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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