CN103532075A - Realization method of capacity expansion operation of 220-500kV lines - Google Patents
Realization method of capacity expansion operation of 220-500kV lines Download PDFInfo
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- CN103532075A CN103532075A CN201310505686.5A CN201310505686A CN103532075A CN 103532075 A CN103532075 A CN 103532075A CN 201310505686 A CN201310505686 A CN 201310505686A CN 103532075 A CN103532075 A CN 103532075A
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Abstract
The invention relates to a realization method of capacity expansion operation of 220-500kV lines. The transmission capacity of the lines can be improved by allowing the maximum permissible operation temperature of a lead wire to achieve 80 DEG C under the condition that the existing power grid resource is fully used; in addition, the transmission capacity of the lines is controlled by monitoring conditions such as different ambient temperatures where the lines are located and the real-time operation temperature of the lead wire, so that operation scheduling personnel can grasp operation conditions of the lines in real time; the transmission capacity of each unit line is improved under lower investment increase; and the method has good reference significance in improving the transmission capacity of the built-up line, lowering the investment of the newly-built line, and solving the problems of line corridor shortage, electric power construction and local planning contradiction, as well as frequent heavy load and overload of a residual section when certain areas or a certain section has N-1 failures.
Description
Technical field
The present invention relates to power circuit capacity increasing technique field, particularly a kind of implementation method of 220～500kV circuit increase-volume operation.
Background technology
In the running of current electrical network, the highest permission operating temperature of overhead transmission line conductor is 70 ℃, due to power load rapid development, causes former old circuit many places to occur the phenomenon of " seizing by the throat ", to the national economic development, brings considerable influence.Simultaneously, in dispatching of power netwoks process, the transmission capacity of unit line mostly is definite value, when " N-1 " fault appears in electrical network, other section also cannot improve conveying capacity at short notice owing to being limited to the highest transmission capacity, and causes large-scale power cuts to limit consumption phenomenon.
Summary of the invention
The implementation method that the object of this invention is to provide a kind of 220～500kV circuit increase-volume operation, can be in the situation that making full use of existing power network resources, by improving the highest permission operating temperature to 80 of wire ℃, increase circuit transmission capacity, by the situations such as real time execution temperature of Monitoring Line varying environment temperature of living in, wire, carry out the transmission capacity of control circuit simultaneously, can make traffic control personnel grasp in real time circuit ruuning situation.
The present invention adopts following scheme to realize: a kind of implementation method of 220～500kV circuit increase-volume operation, it is characterized in that: on to the circuit of pre-increase-volume, circuit weather monitoring instrument and conductor temperature monitoring device are set, in order to gather meteorological data and conductor temperature data; And according to following formula, calculate the ampacity size of wire when different temperatures, can the distance that verification goes out line-to-ground and scissors crossing thing meet the safe distance that rules require:
The heat of conductor resistance loss and absorption solar heat sum should equal wire radiation heat radiation and cross-ventilation heat radiation sum, and the heat balance equation of its wire is:
Q
R+Q
S=Q
f+Q
d
Wherein: Q
rthe heating power of representation unit length conductor resistance
Q
sthe Endothermic power at representation unit length wire sunshine
Q
fthe heat loss through radiation power of representation unit length wire
Q
dthe heat loss through convection power of representation unit length wire
1., wire radiation heat radiation
Q
f＝πDεν[(Tm+273)
4-(t
0+273)
4] (1)
In formula: Q
fthe heat loss through radiation amount (W/m) of-unit length wire
D-diameter of wire (m)
π-circumference ratio, π=3.14
The coefficient of blackness of ε-conductive line surfaces radiation, ε=0.5
ν-Si Difen mono-Boltzmann constant, ν=5.67 * 10
-8(W/m
2)
T
mthe heating temp during work of-wire (℃)
T
0-ambient temperature (℃)
2., cross-ventilation heat radiation
While being greater than 0.2m/s for outdoor wind speed, the condition of heat loss through convection is better, is called forced convection heat radiation; While being less than 0.2m/s for wind speed outside natural draft or room within doors, belong to Natural Heat Convection;
(1), for there being landscape condition lower conductor forced convection heat radiation to solve by formula below:
Q
d=πλ
f(T
m-t
0)[A+B(sinΦ)
n]·C(
)
P (2)
in formula: Q
dthe heat loss through convection amount (W/m) of-unit length wire
Φ-wind is attacked angle
N.A.B-constant, when Φ ∈ (0 °, 24 °),
A＝0.42, B＝0.68，n＝1.08;
When Φ ∈ [24 °, 90 °], A=0.24, B=0.58,
n＝0.9；
λ
fthe pyroconductivity of-conductive line surfaces air film (W/m. ℃)
Press λ
f=2.42 * 10
-2+ 7 * 10
-5[t
0+
(T
m-t
0)] calculate
V
fdynamic viscosity (the m of-conductive line surfaces air film
2/ s)
Press V
f=1.32 * 10
-5+ 9.6 * 10
-8[t
0+
(T
m-t
0)] calculate
V-wind speed (m/s), C.P-constant
=Re=Reynolds number
During calculating, establish Φ=90
0, A=0.42, B=0.58, n=0.9, gets C=0.57, and therefore P=0.485 has:
Q
d＝0.57πλ
f(T
m-t
0)(
)
0.485 (2A)
(2), for calm situation lower conductor Natural Heat Convection, can solve by formula below:
Q
d=1.5πD(T
m-t
0)
1.35 (2B)
3. the heat that, wire absorbs during sunshine
The heat that during sunshine, wire absorbs is:
Qs＝a
s·D·q
s (3)
In formula: the Qs-heat (W/m) that during sunshine, wire absorbs
A
s-conductive line surfaces heat absorption coefficient, general value equates with radiation coefficient, a
s=0.5
Q
s-intensity of sunshine, the power at sunshine of China is got q
s=1000w/m
2
4., the AC resistance of wire
R＝(1＋k)R
20[1+α
20(Tm-20)] (4)
In formula: k-skin effect coefficient, conductor cross-section≤400mm
2, K=0.0025; Conductor cross-section>400mm
2, k=0.01
R-wire is at T
mtime AC resistance (Ω/m)
D-wire diameter (m)
The long-term ampacity allowing of wire during I-different temperatures
R
20the D.C. resistance of-wire in the time of 20 ℃
α
20the temperature coefficient of resistance of-wire in the time of 20 ℃, α
20=0.0042 (℃
-1)
5., wire allows ampacity
Arrange above-mentioned equation group, have
Q
f＝D×8.9×10
－8[(Tm+273)
4-(t
0+273)
4]
Q
d=1.79 (
)
0.485(Tm-t
0)
or
Q
d=1.5πD(Tm-t
0)
1.35
Q
s＝500·D
R＝(1＋k)R
20[1+0.0042(Tm-20)]
According to the equilibrium equation of heat: I
2r+Q
s=Q
f+ Q
d:
I=
(5) take no account of the impact at sunshine
I=
(6) take into account the impact at sunshine
6., conducting wire sag
F=KL
1L
2 (7)
In formula: the conducting wire sag in F-span
L
1the horizontal range of-scissors crossing point and small size hitch point
L
2the horizontal range of-scissors crossing point and large size hitch point
The locating template K value of K-wire
Wherein: K=
(8)
Carrying from anharmonic ratio of g-wire
The stress of σ-wire
7., the state equation of wire
σ
m－
=σ-
-αE(Tm-t) (9)
In formula: g
m, the wire under the known and condition to be pleaded of g-carries (Vm=V is got in this calculating) from anharmonic ratio
σ
m,the stress of conductor under σ-known and condition to be pleaded
T
m, the conductor temperature under the known and condition to be pleaded of t-
The temperature coefficient of elongation of α-wire
The modulus of elasticity of E-wire
The present invention can, so that regulation and control personnel can grasp the operation conditions of circuit in real time, accomplish to accomplish orderly scheduling in the situation that meeting line security operation.Can effectively reduce because of not enough " power cuts to limit consumption " phenomenon causing of circuit transmission capacity, guarantee shaping up of national economy.Newly-built link tester is crossed and is improved the comprehensive method of investment that can reduce circuit after wire transmission capacity.
Accompanying drawing explanation
Fig. 1 is meteorological data of the present invention, temperature acquisition hardware structure schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
The present embodiment provides a kind of implementation method of 220～500kV circuit increase-volume operation, and the method is theoretical according to ampacity, and the experimental technique of verifying the actual ampacity of wire, temperature, sag triadic relation has been invented in research.On the basis of Morgan equation, research draws the computational methods of wire short-time overload electric current.Specific implementation is as follows:
First, suppose when stable state, the heat of conductor resistance loss and absorption solar heat sum should equal wire radiation heat radiation and cross-ventilation heat radiation sum, and the heat balance equation of its wire is:
Q
R+Q
S=Q
f+Q
d
Wherein: Q
rthe heating power of representation unit length conductor resistance
Q
sthe Endothermic power at representation unit length wire sunshine
Q
fthe heat loss through radiation power of representation unit length wire
Q
dthe heat loss through convection power of representation unit length wire
1., heat loss through radiation
Q
f＝πDεν[(Tm+273)
4-(t
0+273)
4] ----------------------------(1)
In formula: Q
fthe heat loss through radiation amount (W/m) of-unit length wire
D-diameter of wire (m)
π-circumference ratio, π=3.14
The coefficient of blackness of ε-conductive line surfaces radiation, ε=0.5
ν-Si Difen mono-Boltzmann constant, ν=5.67 * 10
-8(W/m
2)
T
mthe heating temp during work of-wire (℃)
T
0-ambient temperature (℃)
2., heat loss through convection
The process of heat being taken away by gas each several part generation relative displacement is called convection current.According to the difference of concurrent condition, be divided into two kinds of situations of free convection and forced convection.While being greater than 0.2m/s for outdoor wind speed, the condition of heat loss through convection is better, is called forced convection heat radiation; While being less than 0.2m/s for wind speed outside natural draft or room within doors, belong to Natural Heat Convection.
(1), for there being landscape condition lower conductor forced convection heat radiation to solve by formula below:
Q
d=πλ
f(T
m-t
0)[A+B(sinΦ)
n]·C(
)
P -----------------------(2)
in formula: Q
dthe heat loss through convection amount (W/m) of-unit length wire
Φ-wind is attacked angle
N.A.B-constant, when Φ ∈ (0 °, 24 °),
A＝0.42, B＝0.68，n＝1.08;
When Φ ∈ [24 °, 90 °], A=0.24, B=0.58,
n＝0.9；
λ
fthe pyroconductivity of-conductive line surfaces air film (W/m. ℃)
Press λ
f=2.42 * 10
-2+ 7 * 10
-5[t
0+
(T
m-t
0)] calculate
V
fdynamic viscosity (the m of-conductive line surfaces air film
2/ s)
Press V
f=1.32 * 10
-5+ 9.6 * 10
-8[t
0+
(T
m-t
0)] calculate
V-wind speed (m/s), C.P-constant
=Re=Reynolds number
During calculating, establish Φ=90
0, A=0.42, B=0.58, n=0.9, gets C=0.57, and therefore P=0.485 has:
Q
d＝0.57πλ
f(T
m-t
0)(
)
0.485 -----------------------(2A)
(2), for calm situation lower conductor Natural Heat Convection, can solve by formula below:
Q
d=1.5πD(T
m-t
0)
1.35 -----------------------(2B)
3. the heat that, wire absorbs during sunshine
The heat that during sunshine, wire absorbs is:
Qs＝a
s·D·q
s -------------------------(3)
In formula: the Qs-heat (W/m) that during sunshine, wire absorbs
A
s-conductive line surfaces heat absorption coefficient, general value equates with radiation coefficient, a
s=0.5
Q
s-intensity of sunshine, the power at sunshine of China is got q
s=1000w/m
2
4., the AC resistance of wire
R＝(1＋k)R
20[1+α
20(Tm-20)] ------------------ (4)
In formula: k-skin effect coefficient, conductor cross-section≤400mm
2, K=0.0025; Conductor cross-section>400mm
2, k=0.01
R-wire is at T
mtime AC resistance (Ω/m)
D-wire diameter (m)
The long-term ampacity allowing of wire during I-different temperatures
R
20the D.C. resistance of-wire in the time of 20 ℃
α
20the temperature coefficient of resistance of-wire in the time of 20 ℃, α
20=0.0042 (℃
-1)
5., wire allows ampacity
Arrange above-mentioned equation group, have
Q
f＝D×8.9×10
－8[(Tm+273)
4-(t
0+273)
4]
Q
d=1.79 (
)
0.485(Tm-t
0)
or
Q
d=1.5πD(Tm-t
0)
1.35
Q
s＝500·D
R＝(1＋k)R
20[1+0.0042(Tm-20)]
According to the equilibrium equation of heat: I
2r+Q
s=Q
f+ Q
d:
I=
------------------------impact at sunshine is taken no account of in------(5)
I=
---------------------impact at sunshine is taken into account in-----(6)
6., conducting wire sag
F=KL
1L
2 ------------------------------(7)
In formula: the conducting wire sag in F-span
L
1the horizontal range of-scissors crossing point and small size hitch point
L
2the horizontal range of-scissors crossing point and large size hitch point
The locating template K value of K-wire
Wherein: K=
------------------------------(8)
Carrying from anharmonic ratio of g-wire
The stress of σ-wire
7., the state equation of wire
σ
m－
=σ-
-αE(Tm-t)----------------------------(9)
In formula: g
m, the wire under the known and condition to be pleaded of g-carries (Vm=V is got in this calculating) from anharmonic ratio
σ
m,the stress of conductor under σ-known and condition to be pleaded
T
m, the conductor temperature under the known and condition to be pleaded of t-
The temperature coefficient of elongation of α-wire
The modulus of elasticity of E-wire
the ruling span of-wire place strain section.
Comprehensive all computing formula above, just can calculate the ampacity size of wire when different temperatures, and can the distance that verification goes out line-to-ground and scissors crossing thing meet the safe distance that rules require.
Refer to Fig. 1, the present invention is arranged on conductor temperature monitoring device and the small-sized weather station of different location by collection, the mean temperature of wireless real-time measurement monitoring point wire, wire ambient temperature, weather environment data, ambient temperature, wind speed, wind direction, rainfall, solar radiation etc., information data all sends to main website end trunking communication machine by telecommunications GMS/GPRS network, then by above-mentioned account form, by system, obtained a result, the present invention can be in the situation that making full use of existing power network resources, by improving the highest permission operating temperature to 80 of wire ℃, increase circuit transmission capacity, simultaneously by Monitoring Line varying environment temperature of living in, the situations such as the real time execution temperature of wire are carried out the transmission capacity of control circuit, can make traffic control personnel grasp in real time circuit ruuning situation.In the situation that increase investment is lower, improve the conveying capacity of constituent parts circuit, for increasing built circuit transmission capacity and reducing newly-built track investment, solve and when N-1 fault appears in the contradiction of the nervous situation in circuit corridor, power construction and local plan and some regional or some sections, remain the problem that heavy duty, overload often appear in section and there is good reference significance.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (2)
1. an implementation method for 220～500kV circuit increase-volume operation, is characterized in that: on to the circuit of pre-increase-volume, circuit weather monitoring instrument and conductor temperature monitoring device are set, in order to gather meteorological data and conductor temperature data; And according to following formula, calculate the ampacity size of wire when different temperatures, can the distance that verification goes out line-to-ground and scissors crossing thing meet the safe distance that rules require:
The heat of conductor resistance loss and absorption solar heat sum should equal wire radiation heat radiation and cross-ventilation heat radiation sum, and the heat balance equation of its wire is:
Q
R+Q
S=Q
f+Q
d
Wherein: Q
rthe heating power of representation unit length conductor resistance
Q
sthe Endothermic power at representation unit length wire sunshine
Q
fthe heat loss through radiation power of representation unit length wire
Q
dthe heat loss through convection power of representation unit length wire
1., wire radiation heat radiation
Q
f＝πDεν[(Tm+273)
4-(t
0+273)
4] (1)
In formula: Q
fthe heat loss through radiation amount (W/m) of-unit length wire
D-diameter of wire (m)
π-circumference ratio, π=3.14
The coefficient of blackness of ε-conductive line surfaces radiation, ε=0.5
ν-Si Difen mono-Boltzmann constant, ν=5.67 * 10
-8(W/m
2)
T
mthe heating temp during work of-wire (℃)
T
0-ambient temperature (℃)
2., cross-ventilation heat radiation
While being greater than 0.2m/s for outdoor wind speed, the condition of heat loss through convection is better, is called forced convection heat radiation; While being less than 0.2m/s for wind speed outside natural draft or room within doors, belong to Natural Heat Convection;
(1), for there being landscape condition lower conductor forced convection heat radiation to solve by formula below:
Q
d=πλ
f(T
m-t
0)[A+B(sinΦ)
n]·C(
)
P (2)
in formula: Q
dthe heat loss through convection amount (W/m) of-unit length wire
Φ-wind is attacked angle
N.A.B-constant, when Φ ∈ (0 °, 24 °),
A＝0.42, B＝0.68，n＝1.08;
When Φ ∈ [24 °, 90 °], A=0.24, B=0.58,
n＝0.9；
λ
fthe pyroconductivity of-conductive line surfaces air film (W/m. ℃)
Press λ
f=2.42 * 10
-2+ 7 * 10
-5[t
0+
(T
m-t
0)] calculate
V
fdynamic viscosity (the m of-conductive line surfaces air film
2/ s)
Press V
f=1.32 * 10
-5+ 9.6 * 10
-8[t
0+
(T
m-t
0)] calculate
V-wind speed (m/s), C.P-constant
=Re=Reynolds number
During calculating, establish Φ=90
0, A=0.42, B=0.58, n=0.9, gets C=0.57, and therefore P=0.485 has:
Q
d＝0.57πλ
f(T
m-t
0)(
)
0.485 (2A)
(2), for calm situation lower conductor Natural Heat Convection, can solve by formula below:
Q
d=1.5πD(T
m-t
0)
1.35 (2B)
3. the heat that, wire absorbs during sunshine
The heat that during sunshine, wire absorbs is:
Qs＝a
s·D·q
s (3)
In formula: the Qs-heat (W/m) that during sunshine, wire absorbs
A
s-conductive line surfaces heat absorption coefficient, general value equates with radiation coefficient, a
s=0.5
Q
s-intensity of sunshine, the power at sunshine of China is got q
s=1000w/m
2
4., the AC resistance of wire
R＝(1＋k)R
20[1+α
20(Tm-20)] (4)
In formula: k-skin effect coefficient, conductor cross-section≤400mm
2, K=0.0025; Conductor cross-section>400mm
2, k=0.01
R-wire is at T
mtime AC resistance (Ω/m)
D-wire diameter (m)
The long-term ampacity allowing of wire during I-different temperatures
R
20the D.C. resistance of-wire in the time of 20 ℃
α
20the temperature coefficient of resistance of-wire in the time of 20 ℃, α
20=0.0042 (℃
-1)
5., wire allows ampacity
Arrange above-mentioned equation group, have
Q
f＝D×8.9×10
－8[(Tm+273)
4-(t
0+273)
4]
Q
d=1.79 (
)
0.485(Tm-t
0)
or
Q
d=1.5πD(Tm-t
0)
1.35
Q
s＝500·D
R＝(1＋k)R
20[1+0.0042(Tm-20)]
According to the equilibrium equation of heat: I
2r+Q
s=Q
f+ Q
d:
I=
(5) take no account of the impact at sunshine
I=
(6) take into account the impact at sunshine
6., conducting wire sag
F=KL
1L
2 (7)
In formula: the conducting wire sag in F-span
L
1the horizontal range of-scissors crossing point and small size hitch point
L
2the horizontal range of-scissors crossing point and large size hitch point
The locating template K value of K-wire
Wherein: K=
(8)
Carrying from anharmonic ratio of g-wire
The stress of σ-wire
7., the state equation of wire
σ
m－
=σ-
-αE(Tm-t) (9)
In formula: g
m, the wire under the known and condition to be pleaded of g-carries (Vm=V is got in this calculating) from anharmonic ratio
σ
m,the stress of conductor under σ-known and condition to be pleaded
T
m, the conductor temperature under the known and condition to be pleaded of t-
The temperature coefficient of elongation of α-wire
The modulus of elasticity of E-wire
2. the implementation method of 220～500kV circuit increase-volume operation according to claim 1, is characterized in that: described circuit weather monitoring instrument and conductor temperature monitoring device transmit the employing wireless transmission of data.
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|---|---|---|---|
| CN201310505686.5A CN103532075A (en) | 2013-10-24 | 2013-10-24 | Realization method of capacity expansion operation of 220-500kV lines |
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|---|---|---|---|
| CN201310505686.5A CN103532075A (en) | 2013-10-24 | 2013-10-24 | Realization method of capacity expansion operation of 220-500kV lines |
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ID=49933876
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926484A (en) * | 2014-03-14 | 2014-07-16 | 广东电网公司电力科学研究院 | Electric transmission line dynamic capacity increasing method based on circuit sag real-time measurement |
| CN105138740A (en) * | 2015-07-29 | 2015-12-09 | 广东电网有限责任公司电力科学研究院 | Current capacity solving method of transmission wire inflection point based on temperature field and layered stress |
| CN105552859A (en) * | 2015-12-23 | 2016-05-04 | 国网辽宁省电力有限公司经济技术研究院 | Cross-sectional power transmission capability improvement method considering short-term circuit overload |
| CN106682832A (en) * | 2016-12-27 | 2017-05-17 | 贵州电网有限责任公司贵阳供电局 | Method of increasing capacity of transmission line considering safety check and economic analysis |
| CN109084687A (en) * | 2018-08-29 | 2018-12-25 | 广东电网有限责任公司 | Sag computing method and device thereof based on unmanned plane lidar measurement technology |
| CN109494622A (en) * | 2018-12-30 | 2019-03-19 | 国网北京市电力公司 | Remodeling method, device, storage medium and the processor of overhead distribution |
| CN111398736A (en) * | 2020-03-31 | 2020-07-10 | 国电南瑞科技股份有限公司 | Dynamic evaluation method for current-carrying capacity boundary of power transmission line |
| CN111901439A (en) * | 2020-08-06 | 2020-11-06 | 中国电力工程顾问集团华北电力设计院有限公司 | System and method for dynamically improving transmission capacity of power transmission line based on Internet of things technology |
| CN112380698A (en) * | 2020-11-13 | 2021-02-19 | 广东电网有限责任公司电力科学研究院 | Method and device for detecting steady-state temperature of overhead conductor |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103926484A (en) * | 2014-03-14 | 2014-07-16 | 广东电网公司电力科学研究院 | Electric transmission line dynamic capacity increasing method based on circuit sag real-time measurement |
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| CN105138740A (en) * | 2015-07-29 | 2015-12-09 | 广东电网有限责任公司电力科学研究院 | Current capacity solving method of transmission wire inflection point based on temperature field and layered stress |
| CN105138740B (en) * | 2015-07-29 | 2018-11-20 | 广东电网有限责任公司电力科学研究院 | Transmission pressure inflection point current-carrying capacity method for solving based on temperature field and delamination stress |
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| CN109494622A (en) * | 2018-12-30 | 2019-03-19 | 国网北京市电力公司 | Remodeling method, device, storage medium and the processor of overhead distribution |
| CN111398736A (en) * | 2020-03-31 | 2020-07-10 | 国电南瑞科技股份有限公司 | Dynamic evaluation method for current-carrying capacity boundary of power transmission line |
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