CN103346568A - Low voltage compensation method for construction in extra-long tunnel - Google Patents
Low voltage compensation method for construction in extra-long tunnel Download PDFInfo
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- CN103346568A CN103346568A CN2013102948983A CN201310294898A CN103346568A CN 103346568 A CN103346568 A CN 103346568A CN 2013102948983 A CN2013102948983 A CN 2013102948983A CN 201310294898 A CN201310294898 A CN 201310294898A CN 103346568 A CN103346568 A CN 103346568A
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Abstract
The invention discloses a low voltage compensation method for construction in an extra-long tunnel. High voltage electric is transformed into a 380V power source outside a tunnel to form a three-phase five-line power supply system. When a tunnel face is tunneled to a distance 900 meters away from a tunnel entrance, low voltage compensation equipment is mounted, when the tunnel face is tunneled to the distance 2000 meters away from the tunnel entrance, the low voltage compensation equipment is moved forwards, and when the tunnel face is tunneled to the distance 2800 meters away from the tunnel entrance, the low voltage compensation equipment is moved forwards again. The problem of tunnel lining jumping is effectively solved, safety guarantee is enhanced, and construction progress is accelerated. Compared with a traditional mode that high voltage electric is brought in the tunnel or the mode that the secondary voltage transformation is carried out, the low voltage compensation equipment is simple in structure, small in size, low in cost and extremely easy to operate, disadvantages that tunnel space is narrow, machines and vehicles inconveniently go through in single line tunnel construction are effectively avoided, and the low voltage compensation method for the construction in the extra-long tunnel has huge popularization and utilization value in the field of tunnel engineering construction.
Description
Technical field
The present invention relates to a kind of low-voltage power supply method, specifically is construction low-voltage compensation method of supplying power in the super long tunnel, belongs to the construction of railways field.
Background technology
In Extra Long Tunnel Construction, face mileage and hole are when 900m, employed air compressor machine, propeller fan, delivery pump, suction pump, concrete sprayer, electric welding machine, large power-consuming equipment power consumptions such as jet blower are very big, along with the tunnel excavation drilling depth increases, supply line lengthens, bigger voltage drop can appear in power supply, wretched insufficiency appears in tunnel inner working face supply power voltage, drilling depth is more big, pressure drop phenomena is more serious, because tunnel piercing is too fast, two linings do not satisfy safe red line requirement, must jump lining or stop driving and could satisfy the red line requirement, and the jumping lining must cause high-tension line to be attached on the preliminary bracing wall and pass through two lining chassis, thereby the potential safety hazard of bringing directly affects normally carrying out of engineering construction.According to relevant power supply standard and construction experience, 0.4kV the three-phase line radius of electricity supply should not surpass 0.8 km, the voltage drop of power line and 220V illuminating line end must not surpass 5%, when tunnel piercing 900m, terminal voltage has not reached the power consumption equipment rated voltage, cause large-scale electric equipment cisco unity malfunction such as delivery pump in the hole, normal electricity consumption is pressed 0.75 multiplying factor of power consumption equipment power and is considered, then electricity consumption is 825kW in the tunnel, if still use 800kVA transformer traditional outside the tunnel to carry power supply, can't satisfy the power supply for construction requirement at all.
The method that power supply for construction adopts in the super long tunnel is that high pressure is introduced the tunnel at present, perhaps in the tunnel, carry out the secondary transformation, but because the space is narrow and small in the construction single-track tunnel, vehicle pass-through is inconvenience extremely, adopt above-mentioned two kinds of construction methods can all bring the unfavorable factor of potential safety hazard and increase cost, especially for the construction method of jumping lining in the tunnel-liner, can't satisfy the safety utilization of electric power requirement at all, be difficult to guarantee the normal operation circulation construction in tunnel.Therefore in the face of construction in the super long tunnel, advanced design, rationally, electric power system in the tunnel of safety, economy, science, disposing corresponding power supply unit is the important leverage that realizes that super long tunnel is fast and safely constructed, and the long distance construction power supply has become the big core technical barrier that the control super long tunnel is built in the tunnel at present.
Summary of the invention
To the objective of the invention is the problems such as the line loss that power supply for construction exists in the super long tunnel is big, undertension in order solving, and to overcome the existing defective of conventional method of high pressure being introduced the tunnel, and disclose construction low-voltage compensation method of supplying power in a kind of super long tunnel.
Technical scheme of the present invention is:
A. transformation outside the tunnel
The 35kV high-tension electricity is connect transformer become the 380V power supply in the tunnel face, by power distribution cabinet output, form electric power system outside the tunnel then;
B. line in tunnel is laid
The tunnel low-voltage circuit is laid whole fixed supports that adopt be erected on the two chemise walls, select the GB cable for use, reduce unnecessary transition joint, adopt swagelok in all joints, circuit is blocked, adopt the mode of welding again behind the line ball to guarantee that circuit forms integral body, reduce current loss;
C. super apart from low-voltage compensation
In the tunnel, carry out the secondary transformation, set up low-voltage compensation apparatus in tunnel piercing later on to 900m, in the time of can't starting because voltage reduces for powerful device, adopt the compensation delay table to adjust, thereby powerful device moment is compensated, reaches normal startup and work.
The invention has the beneficial effects as follows: adopt low-voltage compensation apparatus, prevented owing to adopt the high phase mutual interference between the potential safety hazard brought in the tunnel and constructing tunnel process each operation of compressing into, at any time can follow up according to the extension of supply line, effectively solve the tunnel and jumped a lining difficult problem, strengthen safety guarantee, accelerated construction schedule; Compress into the tunnel with traditional height or carry out the secondary transformation and compare, the low-voltage compensation device structure is simple, volume is little, cost is low, very easily operation, in the single-track tunnel construction, effectively avoid unfavorable conditions narrow because of tunnel space, the current inconvenience of motor vehicles and machines, had great popularizing value in the tunnel construction field.
Description of drawings
Accompanying drawing is the circuit diagram of low-voltage compensation apparatus of the present invention.
Description of reference numerals is as follows:
Phase line L1, phase line L2, phase line L3, capacitor compensation cabinet G, current transformer TA, residual current circuit breaker RCD, capacitor C, zero line N, earth connection PE.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is done and to be described in further detail:
A. transformation outside the tunnel
The 35kV high-tension electricity is become the 380V power supply at tunnel external transformer secondary output, and the transformer output adopts 3 * 240+1 * 120mm
2Aluminium core armoured cable together by power distribution cabinet output, forms three-phase five-wire mode electric power system outside the tunnel with the transformer grounding line;
B. line in tunnel is laid
The tunnel low-voltage circuit is laid whole fixed supports that adopt be erected on the two chemise walls, press three-phase five-wire mode and lay, adopt 3 * 240+1 * 120+1 * 120mm
2Aluminum core line is selected the GB cable for use, and circuit is laid need be straight, reduces unnecessary transition joint, adopts swagelok in all joints, and circuit is blocked, and adopts the mode of welding again behind the line ball to guarantee that circuit forms integral body, reduces current loss;
C. super apart from low-voltage compensation
When face tunnels apart from 900 meters of tunnel faces, low-voltage compensation equipment is installed at back 800 meters refuge chamber places at two linings, low-voltage line adopts common 240mm2 aluminium core rubber sheathed wire, the job site need for electricity is satisfied in check, when the face mileage tunnels apart from 2000 meters of tunnel faces, the low-voltage compensation equipment at 800 meters is moved to the back 1900 meters refuge chamber places of two linings, when the face mileage tunnels apart from 2800 meters of tunnel faces, the low-voltage compensation equipment at 1900 meters is moved to the back 2700 meters refuge chamber places of two linings, in that voltage drop is excessive can't satisfy construction requirement the time, at original circuit front end one section cable in parallel, the job site need for electricity is satisfied in check.
The mode of connection of low-voltage compensation apparatus is, one end of three 240mm2 aluminium core rubber sheathed wires and (BVR) 2.5mm2 line is connected to phase line (L1), phase line (L2), on phase line (L3) and the zero line (N), main equipment connects earth connection (PE) in the tunnel, phase line (L1), phase line (L2), another termination of phase line (L3) is inserted on the interior battery main switch of capacitor compensation cabinet (G), the other end of residual current circuit breaker (BVR) 2.5mm2 lead inserts on capacitor compensation cabinet (G) the panel board binding post, again with capacitor compensation cabinet (G) wherein a phase line (L1) cut off, then current transformer (TA) is inserted in a termination of cutting off phase line (L1), two broken ends to cutting off phase line (L1) again reconnect, at last current transformer (TA) binding post is inserted capacitor compensation cabinet (G) binding post respectively, seven self-healing low-voltage shunt capacitors (C) are housed in the capacitor compensation cabinet (G), model BSMJ0.4-30-3, each capacitor (C) rated capacity 30kvar, rated capacitance 596.8uf.
Claims (3)
1. construction low-voltage compensation method of supplying power in the super long tunnel is characterized in that: be to finish by the following technical programs:
A. transformation outside the tunnel
The 35kV high-tension electricity is connect transformer become the 380V power supply in the tunnel face, by power distribution cabinet output, form electric power system outside the tunnel then;
B. line in tunnel is laid
The tunnel low-voltage circuit is laid whole fixed supports that adopt be erected on the two chemise walls, select the GB cable for use, reduce unnecessary transition joint, adopt swagelok in all joints, circuit is blocked, adopt the mode of welding again behind the line ball to guarantee that circuit forms integral body, reduce current loss;
C. super apart from low-voltage compensation
In the tunnel, carry out the secondary transformation, set up low-voltage compensation apparatus in tunnel piercing later on to 900m, in the time of can't starting because voltage reduces for powerful device, adopt the compensation delay table to adjust, thereby powerful device moment is compensated, reaches normal startup and work.
2. construction low-voltage compensation method of supplying power in the super long tunnel according to claim 1 is characterized in that:
A. the transformer output adopts 3 * 240+1 * 120mm outside the tunnel
2Aluminium core armoured cable together by power distribution cabinet output, forms three-phase five-wire mode electric power system outside the tunnel with the transformer grounding line;
B. line in tunnel is pressed three-phase five-wire mode and is laid employing 3 * 240+1 * 120+1 * 120mm
2Aluminum core line;
C. super apart from low-voltage compensation, when face tunnels apart from 900 meters of tunnel faces, low-voltage compensation equipment is installed at back 800 meters refuge chamber places at two linings, low-voltage line adopts common 240mm2 aluminium core rubber sheathed wire, the job site need for electricity is satisfied in check, when the face mileage tunnels apart from 2000 meters of tunnel faces, the low-voltage compensation equipment at 800 meters is moved to the back 1900 meters refuge chamber places of two linings, when the face mileage tunnels apart from 2800 meters of tunnel faces, the low-voltage compensation equipment at 1900 meters is moved to the back 2700 meters refuge chamber places of two linings, in that voltage drop is excessive can't satisfy construction requirement the time, at original circuit front end one section cable in parallel, the job site need for electricity is satisfied in check.
3. construction low-voltage compensation method of supplying power in the super long tunnel according to claim 1, the mode of connection that it is characterized in that low-voltage compensation apparatus is, one end of three 240mm2 aluminium core rubber sheathed wires and (BVR) 2.5mm2 line is connected to phase line (L1), phase line (L2), on phase line (L3) and the zero line (N), main equipment connects earth connection (PE) in the tunnel, phase line (L1), phase line (L2), another termination of phase line (L3) is inserted on the interior battery main switch of capacitor compensation cabinet (G), the other end of residual current circuit breaker (BVR) 2.5mm2 lead inserts on capacitor compensation cabinet (G) the panel board binding post, again with capacitor compensation cabinet (G) wherein a phase line (L1) cut off, then current transformer (TA) is inserted in a termination of cutting off phase line (L1), two broken ends to cutting off phase line (L1) again reconnect, at last current transformer (TA) binding post is inserted capacitor compensation cabinet (G) binding post respectively, seven self-healing low-voltage shunt capacitors (C) are housed in the capacitor compensation cabinet (G), model BSMJ0.4-30-3, each capacitor (C) rated capacity 30kvar, rated capacitance 596.8uf.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2013102948983A CN103346568A (en) | 2013-07-15 | 2013-07-15 | Low voltage compensation method for construction in extra-long tunnel |
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| CN2013102948983A CN103346568A (en) | 2013-07-15 | 2013-07-15 | Low voltage compensation method for construction in extra-long tunnel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109936108A (en) * | 2019-01-04 | 2019-06-25 | 淮北工科检测检验有限公司 | A kind of downhole anti-explosion WSN communication locating device system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101882788A (en) * | 2009-09-14 | 2010-11-10 | 株洲变流技术国家工程研究中心有限公司 | Method and device for improving supply voltage at tail end of long supply arm of heavy haul railway |
| CN102222916A (en) * | 2011-06-29 | 2011-10-19 | 株洲变流技术国家工程研究中心有限公司 | Device and method for boosting network voltage at tail end of electrified railway power supply arm |
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- 2013-07-15 CN CN2013102948983A patent/CN103346568A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101882788A (en) * | 2009-09-14 | 2010-11-10 | 株洲变流技术国家工程研究中心有限公司 | Method and device for improving supply voltage at tail end of long supply arm of heavy haul railway |
| CN102222916A (en) * | 2011-06-29 | 2011-10-19 | 株洲变流技术国家工程研究中心有限公司 | Device and method for boosting network voltage at tail end of electrified railway power supply arm |
Non-Patent Citations (3)
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| 吕斌: "雪峰山特长隧道供电系统设计", 《公路工程》 * |
| 夏叶萍: "丁庄隧道的无功电力自动补偿", 《铁道标准设计通讯》 * |
| 聂永岗: "OB型交流电压补偿器在云中山特长隧道的应用", 《山西建筑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109936108A (en) * | 2019-01-04 | 2019-06-25 | 淮北工科检测检验有限公司 | A kind of downhole anti-explosion WSN communication locating device system |
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Application publication date: 20131009 |