CN203225700U - Mining explosion-proof and intrinsically-safety frequency conversion center - Google Patents
Mining explosion-proof and intrinsically-safety frequency conversion center Download PDFInfo
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- CN203225700U CN203225700U CN 201320185928 CN201320185928U CN203225700U CN 203225700 U CN203225700 U CN 203225700U CN 201320185928 CN201320185928 CN 201320185928 CN 201320185928 U CN201320185928 U CN 201320185928U CN 203225700 U CN203225700 U CN 203225700U
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Abstract
A mining explosion-proof and intrinsically-safety frequency conversion center comprises an explosion-proof housing and an input cable terminal, an output terminal, a vacuum distribution unit, a phase-shifting transformer unit, a multi-level power conversion unit, a water cooling system and a control unit which are arranged in the housing; wherein an input cable is connected with the vacuum distribution unit, the vacuum distribution unit is connected with the phase-shifting transformer unit and a control power transformer, the control power transformer supplies power to a control system and the water cooling system, the phase-shifting transformer is connected with the multi-level power conversion unit, the multi-level power conversion unit is connected with an output of the frequency conversion center and a motor under frequency conversion drag control through the output terminal, the phase-shifting transformer is a water-cooling phase-shifting transformer, and the control system controls the vacuum distribution unit, the multi-level power conversion unit, and the water cooling system. The mining explosion-proof and intrinsically-safety frequency conversion center of the utility model can be directly accessed to a 6000VAC or 10000VAC power supply system under a coal mine, and has an output voltage ranging from 0 VAC to 3465 VAC and an output frequency ranging from 0 Hz to 50 Hz, so as to directly perform frequency conversion drag control to the motor at the grade of 1000kW/3300V or below.
Description
Technical field
The utility model relates to the mining face under mine power supply of a kind of colliery and motor frequency conversion drags control appliance, especially can carry out the equipment that frequency conversion drags control to the heavy-duty motor of coal-face drag conveyor equipment.
Background technology
Just is exploiting towards highly efficient and productive, energy saving direction development in the colliery, is subjected to the down-hole spatial limitation, requires equipment to reduce volume as far as possible when satisfying application demand, reduces cost.In recent years, the colliery mining face under mine begins utilizing high power energy-saving and frequency-variable equipment.At present, the mode that the variable frequency control of mining face under mine drag conveyor equipment heavy-duty motor adopts mobile substation transformation, unit switch distribution, frequency converter to drag usually, whole system mainly contains two kinds of formation patterns: a kind of is that mobile substation, unit switch, frequency converter and motor constitute, and another kind is mobile substation, unit switch, frequency conversion one motor formation.The Modern coal mines down-hole is adopted the above voltage gradation power supply of 6000V usually, need at first utilize the mobile substation to be depressurized to 3300V or 1140V voltage at coal-face, afterwards by the unit switch distribution, be frequency converter or the power supply of frequency conversion one motor, existing variable frequency control tactic pattern causes working face equipment more, cost is higher, and it is bigger to take up room, and is unfavorable for the operation and maintenance of equipment.
Constitute complicated, drawbacks such as volume is big, use inconvenience in order to overcome present colliery mining face under mine powerful device motor frequency conversion dragging system, the utility model provides a kind of mine flameproof and intrinsic safety type frequency conversion center.
The utility model content
The mine flameproof and intrinsic safety type frequency conversion center that the utility model provides, integrate transformation, distribution, frequency conversion drag function, input can directly insert 6000V electric pressure or 10000V electric pressure electric power system under the coal mine, output can be carried out frequency conversion at 1200kW/3300V grade and following mining heavy-duty motor and drag control, make under the coal mine working face equipment especially the frequency conversion dragging system of drag conveyor motor realize simplification and integrated.
Mine flameproof and intrinsic safety type frequency conversion center comprises explosion-proof casing and is installed in explosion-proof casing interior input cable termination, outlet terminal, vacuum power supply unit, phase shifting transformer unit, many level power converter unit, water-cooling system and control unit; Explosion-proof casing can be divided into the control system chamber of vacuum distribution equipment chamber, the phase shifting transformer chamber that phase shifting transformer is installed that the vacuum power supply unit is installed, many level power converter unit chamber that many level power converter unit is installed, the cooling system chamber that water-cooling heat radiating system is installed and installation control unit; In explosion-proof casing; the input cable termination connects the high-voltage suppling power of colliery mining face under mine; be the frequency conversion center feed; the input cable other end connects the vacuum power supply unit; the output of vacuum power supply unit connects phase shifting transformer unit and control power transformer; the control power transformer is control system; the water-cooling system power supply; the output of phase shifting transformer is connected with many level power converter unit; many level power converter unit connects outlet terminal; outlet terminal other end connection frequency conversion center output and frequency conversion drag the motor of control; wherein; phase shifting transformer is the water-cooled phase shifting transformer; be phase shifting transformer by water-cooling system; many level power converter unit cools off, and control system is to the vacuum power supply unit; many level power converter unit; water-cooling system is controlled, and whole system is carried out monitoring and protecting.
Two-phase limit operational mode is adopted at the frequency conversion center; optional tape speed sensor vector control or V/F control; possess overcurrent protection, overvoltage/under-voltage protection, open-phase protection, short-circuit protection, overload protection, motor overheating protection, ground protection, earth leakage search/lockout, overtemperature prote, water-cooling system failure protection function, adopt the inside and outside water circulation type of cooling.
Described input cable termination is used for connecting colliery mining face under mine high voltage supply cable, is the frequency conversion center feed.Simultaneously, standby terminals, the parallel operation circuit is used to miscellaneous equipment that high voltage source is provided.
Described vacuum power supply unit connects external power source and inner phase shifting transformer, realizes the management of input power supply disjunction and fault trip, and breaks away from electrical network during the implement device internal fault and protect, and limits the frequency converter initial stage charging current that powers on.By the manual operation handle isolating switch is separated with bus, realize the effect of high pressure isolation switch.
Described water-cooled phase shifting transformer connects power supply unit and many level power converter unit, is used for realizing to importing the step-down phase shift of power supply, for each power converter unit provides 715AC ± 2% low-tension supply.Wye connection is adopted on the former limit of phase shifting transformer, 9 winding outputs of secondary, whole phase shift, between the different secondary windings certain phase difference is arranged, can eliminate the harmonic current that produces because of back level power cell power electronic device work in the electrical network, the total harmonic distortion of input current (THD) adopts the deionized water water cooling method much smaller than the requirement of national standard 5%.
Described many level power converter unit adopts H bridge cascade connection multi-level mode, whenever adopts three grades of series connection mutually, and whole many level power converter unit three-phase is totally 9 power converter unit modules.Each power converter unit module adopts three phase full wave rectification, and the equivalence of whole many level power converter unit rectification side is 54 pulse wave rectifiers, can reduce the harmonic current that injects electrical network greatly, and power factor is greater than 0.95.0～3465VAC is adjustable for many level power converter unit output voltage, and level number is up to 13 level, sinusoidal degree height, and power supply distance is far away, and the direct power supply distance maximum of frequency conversion center output can reach 500m, needs when surpassing 500m at outlet side output filter to be installed.Rated output voltage 3300VAC, frequency 0～50Hz.
Described water-cooling system is that phase shifting transformer, many level power converter unit cool off, and adopts two water-cooled circulating pump controls, and a worker one is equipped with double pump, improves the job stability of water-cooling system.The inside and outside water of water-cooling system is isolated, and interior circulation heat eliminating medium is deionized water, and effectively the reinforced insulation isolation satisfies the conductivity requirement of 10kV insulation national Specification.Outer water can bear 3MPa pressure.The total heat-sinking capability of cooling system is 55kW, the maximum gross calorific power 35kW of system.Water-cooling control system is monitored in real time to conductivity, and conductivity is reported to the police and triggering system tripping operation outage after surpassing threshold value.
Described control system adopts Siemens S7-200PLC controller; vacuum power supply unit, many level power converter unit, water-cooling system are controlled; the monitoring and protecting that carries out to whole system; the defencive function that possesses mining frequency conversion equipment standard code: overcurrent protection, overvoltage/under-voltage protection, open-phase protection, short-circuit protection, overload protection, motor overheating protection, ground protection, earth leakage search/lockout, overtemperature prote, water-cooling system failure protection function, and possess multimachine power (torque) balance control function and remote control function.Control system shows equipment state and state of a control by seven cun touch-screens of the Kunlun on-state TCP7062KX.
The utility model is integrated working face high pressure mobile substation, unit switch, frequency converter functions of the equipments, can replace coal mine downhole crossheading mobile substation, unit switch, frequency converter equipment, reduce working face equipment quantity and volume, reduce cost, realize falling this energy-conservation effect of putting forward.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the front view at mine flameproof and intrinsic safety type frequency conversion center.
Fig. 2 is the front right side view at mine flameproof and intrinsic safety type frequency conversion center.
Fig. 3 is the back side left side view at mine flameproof and intrinsic safety type frequency conversion center.
Fig. 4 is the electrical systematic drawing at 1000kVA/6000V/3300V mine flameproof and intrinsic safety type frequency conversion center.
Fig. 5 is the electrical systematic drawing at 1200kVA/10000V/3300V mine flameproof and intrinsic safety type frequency conversion center.
Fig. 6 is the schematic diagram at mine flameproof and intrinsic safety type frequency conversion center.
Fig. 7 is mine flameproof and intrinsic safety type frequency conversion center power cell electric diagram.
Among the figure, 1 is vacuum power supply unit chamber, and 2,3 is the door in many level power converter unit chamber, and 4 is chamber, water-cooled phase shifting transformer unit, and 5 is the cooling system chamber, and 6 is the control unit chamber, and 7 is outlet terminal, and 8 is input terminal, and 9 is many level power converter unit chamber.
Embodiment
The structure at frequency conversion center, as shown in Figure 2, mine flameproof and intrinsic safety type frequency conversion of the present utility model center, explosion-proof casing can be divided into vacuum power supply unit chamber (1), chamber, water-cooled phase shifting transformer unit (4), cooling system chamber (5), control unit chamber (6) and many level power converter unit chamber (9).Frequency conversion center input terminal (8) connects external power source and frequency conversion center, is the frequency conversion center feed.The inner vacuum power supply unit of installing in vacuum distribution equipment chamber (1) is used for carrying out distribution and monitoring and protecting, and the output of vacuum power supply unit is connected to chamber, water-cooled phase shifting transformer unit (4), links to each other with the input of water-cooled phase shifting transformer, is the phase shifting transformer power supply.Phase shifting transformer output links to each other with many level power converter unit cavity (9), is each power conversion module power supply of many level power converter unit.Wherein, in order to reduce the space of opening the door, adapt to the narrow and small condition in space under the coal mine, many level power converter unit cavity (9) is provided with two doors (2,3), makes things convenient for operation and maintenance.The output of many level power converter unit connects external cable by outlet terminal (7), is the motor device power supply.Control unit is installed in the control unit chamber (6), the work of control frequency conversion center vacuum power supply unit, power converter unit, phase shifting transformer, water-cooling system.Water pump and inside and outside water circulation heat radiation device are installed in the cooling system chamber (5).
Fig. 4 is the electrical schematic diagram at 1000kVA/6000V/3300V mine flameproof and intrinsic safety type frequency conversion center, its input voltage is 6000VAC ± 10%, input supply frequency 50 ± 3Hz, output voltage 0～3465VAC, rated output voltage 3465VAC (being 3300V), output-current rating 175A, output frequency 0～50Hz, frequency resolution 0.01Hz, rated power 1000kVA.The input terminal at frequency conversion center connects outside 6000Vac power supply, is whole frequency conversion center feed.After external power source enters the frequency conversion center, at first enter the vacuum power supply unit, carry out corresponding distribution and protection monitoring.Vacuum power supply unit output two-way, the one road supplies with 10kVA/6kV/380V control transformer T1, is used to control unit, water-cooling system and cooling system power supply; Another road connection-water-cooled phase shifting transformer T2.Water-cooled phase shifting transformer total capacity 1130kVA, adopt Y/ extend-triangle/yn mode of connection, the secondary winding has 9 tunnel outputs, every road output 715Vac, 9 power cell conversion modules that connect many level power converter unit respectively, adopt whole phase shift system, every winding 125kVA, each module connects one road power converter unit.
As shown in Figure 5,12000kVA/10000V/3300V mine flameproof and intrinsic safety type frequency conversion center, input voltage is 6000VAC ± 10%, input supply frequency 50 ± 3Hz, output voltage 0～3465VAC, rated output voltage 3465VAC (being 3300V), output-current rating 210A, output frequency 0～50Hz, frequency resolution 0.01Hz, rated power 1200kVA.The input terminal at frequency conversion center connects outside 10000Vac power supply, is whole frequency conversion center feed.After external power source enters the frequency conversion center, at first enter the vacuum power supply unit, carry out corresponding distribution and protection monitoring.Vacuum power supply unit output two-way, the one road supplies with 10kVA/6kV/380V control transformer T1, is used to control unit, water-cooling system and cooling system power supply; Another road connection-water-cooled phase shifting transformer T2.Water-cooled phase shifting transformer total capacity 1355kVA, adopt Y/ extend-triangle/yn mode of connection, the secondary winding has 9 tunnel outputs, every road output 715Vac, 9 power cell conversion modules that connect many level power converter unit respectively, adopt whole phase shift system, every winding 150kVA, each module connects one road power converter unit.
Many level power converter unit adopts H bridge cascade connection multi-level mapped structure, and 3 power cell conversion module series connection of every phase are shown in Fig. 6 electrical schematic diagram.3 of many level power converter unit is exported mutually by frequency conversion center outlet terminal, connects external motor equipment.Many level power converter unit adopts the deionized water water-cooling pattern to carry out cooling heat dissipation.
Each power converter unit module main loop circuit as shown in Figure 7.Power converter unit input termination Circuit Fault on Secondary Transformer winding low-voltage output behind the three phase full wave rectification bridge, forms direct voltage, behind capacitor filtering, supplies with the H bridge inverter circuit of being made up of the IGBT power model.Inverter circuit IGBT is by receiving the optical fiber triggering signal, through PWM control technology control output.Whenever, have the series connection of 3 power converter unit modules mutually, be output as the stack of the SPWM ripple of 3 power converter unit module outputs, the output-voltage levels number is up to 13 level, output waveform sine degree is higher, and dv/dt is less, also can keep good waveform under low speed, insulation to cable and motor does not have specific (special) requirements, be applicable to conventional cable and motor, and frequency conversion center direct power supply distance up 500m, can output filter be installed at outlet side when surpassing 500m.This device adopts phase shifting transformer, can eliminate the harmonic current that produces because of power electronic device work in the power cell in the electrical network, the total harmonic distortion of input current (THD) is much smaller than the requirement of national standard 5%, and can keep the input power factor near 1, can effectively improve the quality of net side electric energy.Output can be selected speed sensor vector control or V/F control for use, and the rotating speed control precision is 0.04%.
Claims (9)
1. mine flameproof and intrinsic safety type frequency conversion center comprises explosion-proof casing and is installed in explosion-proof casing interior input cable termination, outlet terminal, vacuum power supply unit, phase shifting transformer unit, many level power converter unit, water-cooling system and control unit; Explosion-proof casing can be divided into the control system chamber of vacuum distribution equipment chamber, the phase shifting transformer chamber that phase shifting transformer is installed that the vacuum power supply unit is installed, many level power converter unit chamber that many level power converter unit is installed, the cooling system chamber that water-cooling heat radiating system is installed and installation control unit; In explosion-proof casing; input cable termination one end connects the high-voltage suppling power of colliery mining face under mine; the other end connects the vacuum power supply unit; the output of vacuum power supply unit connects phase shifting transformer unit and control power transformer; the control power transformer is control system; the water-cooling system power supply; the output of phase shifting transformer is connected with many level power converter unit; many level power converter unit connects outlet terminal; outlet terminal other end connection frequency conversion center output and frequency conversion drag the motor of control; it is characterized in that; described phase shifting transformer is the water-cooled phase shifting transformer; be phase shifting transformer by water-cooling system; many level power converter unit cools off; control system is to the vacuum power supply unit; many level power converter unit; water-cooling system is controlled, and whole system is carried out monitoring and protecting.
2. mine flameproof and intrinsic safety type frequency conversion as claimed in claim 1 center, it is characterized in that, described many level power converter unit adopts H bridge cascade connection multi-level mode, whenever, adopt three grades of series connection mutually, connect three power converter unit modules, each power converter unit module adopts three phase full wave rectification, and whole many level power converter unit output-voltage levels number is 13 level, the input equivalence is 54 pulse wave rectifiers, and power factor is greater than 0.95.
3. mine flameproof and intrinsic safety type frequency conversion as claimed in claim 2 center is characterized in that, wye connection is adopted on the former limit of described phase shifting transformer, and 9 windings outputs of secondary are whole phase shift.
4. as claim 1 or 2 or 3 described mine flameproof and intrinsic safety type frequency conversion centers, it is characterized in that, described phase shifting transformer and many level power converter unit adopt the deionized water water-cooled type of cooling, the inside and outside water of water-cooling system is isolated, interior circulation heat eliminating medium is deionized water, water-cooling system adopts two water-cooled circulating pump controls, and a worker one is equipped with double pump.
5. as claim 1 or 2 or 3 described mine flameproof and intrinsic safety type frequency conversion centers, it is characterized in that described control system adopts Siemens S7-200PLC controller, control system shows equipment state and state of a control by touch-screen.
6. mine flameproof and intrinsic safety type frequency conversion as claimed in claim 4 center, it is characterized in that, described frequency conversion center input voltage 6000VAC ± 10% input supply frequency, 50 ± 3Hz, rated output voltage 0～3465VAC, rated current 175A, output frequency 0～50Hz, frequency resolution 0.01Hz, rated power 1000kVA, adopt two-phase limit operational mode, the control of tape speed sensor vector, the frequency conversion center is exported direct power supply distance and is 500m to the maximum, needs when surpassing 500m at outlet side output filter to be installed.
7. mine flameproof and intrinsic safety type frequency conversion as claimed in claim 4 center is characterized in that described frequency conversion center input voltage 6000VAC ± 10%, input supply frequency 50 ± 3Hz, rated output voltage 0～3465VAC, rated current 175A, output frequency 0～50Hz, frequency resolution 0.01Hz, rated power 1000kVA adopts two-phase limit operational mode, V/F control, the frequency conversion center is exported direct power supply distance and is 500m to the maximum, needs when surpassing 500m at outlet side output filter to be installed.
8. mine flameproof and intrinsic safety type frequency conversion as claimed in claim 4 center, it is characterized in that, described frequency conversion center input voltage 10000VAC ± 10% input supply frequency, 50 ± 3Hz, rated output voltage 0～3465VAC, rated current 210A, output frequency 0～50Hz, frequency resolution 0.01Hz, rated power 1200kVA, adopt two-phase limit operational mode, the control of tape speed sensor vector, the frequency conversion center is exported direct power supply distance and is 500m to the maximum, needs when surpassing 500m at outlet side output filter to be installed.
9. mine flameproof and intrinsic safety type frequency conversion as claimed in claim 4 center is characterized in that described frequency conversion center input voltage 10000VAC ± 10%, input supply frequency 50 ± 3Hz, rated output voltage 0～3465VAC, rated current 210A, output frequency 0～50Hz, frequency resolution 0.01Hz, rated power 1200kVA adopts two-phase limit operational mode, V/F control, the frequency conversion center is exported direct power supply distance and is 500m to the maximum, needs when surpassing 500m at outlet side output filter to be installed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320185928 CN203225700U (en) | 2013-04-15 | 2013-04-15 | Mining explosion-proof and intrinsically-safety frequency conversion center |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320185928 CN203225700U (en) | 2013-04-15 | 2013-04-15 | Mining explosion-proof and intrinsically-safety frequency conversion center |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953797A (en) * | 2015-07-08 | 2015-09-30 | 西安交通大学 | Novel 6kV anti-explosion frequency converter structure for mining |
-
2013
- 2013-04-15 CN CN 201320185928 patent/CN203225700U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953797A (en) * | 2015-07-08 | 2015-09-30 | 西安交通大学 | Novel 6kV anti-explosion frequency converter structure for mining |
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