CN220066889U - Adjustable intrinsic safety type voltage sag prevention device - Google Patents
Adjustable intrinsic safety type voltage sag prevention device Download PDFInfo
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- CN220066889U CN220066889U CN202320681741.5U CN202320681741U CN220066889U CN 220066889 U CN220066889 U CN 220066889U CN 202320681741 U CN202320681741 U CN 202320681741U CN 220066889 U CN220066889 U CN 220066889U
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- 230000002265 prevention Effects 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 57
- 230000003068 static effect Effects 0.000 claims abstract description 25
- 238000012423 maintenance Methods 0.000 claims description 9
- 238000002955 isolation Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
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- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000003860 storage Methods 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 4
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- 230000009897 systematic effect Effects 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
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Abstract
The utility model discloses an adjustable intrinsic safety type voltage sag prevention device, which comprises a rectifier connected with a main power supply and a switch QF2 connected with a standby power supply, wherein the output end of the rectifier is sequentially connected with an inverter and a switch QF4, the switch QF2 is connected with a switch QF5, the switch QF4 and the switch QF5 are both connected with the input end of a static change-over switch, the output end of the static change-over switch is connected with a low-voltage detection unit through an overhaul switch QF7, the low-voltage detection unit is connected with one end of a contactor KM, the other end of the contactor KM is connected with a zero line, the output end of the static change-over switch is connected with a parallel switch group through a load main switch QF8, and the parallel switch group is connected with a load through a plurality of load switches; by changing the action of the contactor, the service life of the contactor is prolonged, the reliability and stability of the device are greatly improved, various unplanned parking accidents caused by voltage sag and electricity interference of an electrical system are reduced, the production continuity of enterprises is improved, and higher economic benefits are brought to the enterprises.
Description
Technical Field
The utility model belongs to the technical field of voltage sag prevention devices in electrical low-voltage systems, and particularly relates to an adjustable intrinsic safety type voltage sag prevention device.
Background
The voltage sag can cause an unplanned shutdown accident of a production system, meanwhile, equipment is damaged, the quality of products is unqualified, safety accidents can be caused in high-risk industries, the safety of people and equipment is endangered, the problem that the voltage sag can not be systematically solved by products on the market at present is solved, and under the background, an intrinsic safety type systematic voltage sag prevention device which can well solve the systematic voltage sag and can not cause the faults because of the problems of the intrinsic safety type systematic voltage sag prevention device is very urgent for large enterprises.
Voltage sag is a phenomenon that the occurrence probability is very high, any point failure of an electrical system can cause system voltage fluctuation, each failure is irregular and circulated, great challenges are brought to management and response of the failures, critical equipment in an enterprise production system, particularly heavy-duty equipment, are particularly sensitive to voltage, when the voltage is temporarily reduced to 80%, 50% and 20%, loads can be theoretically maintained for 2 seconds, 1 second and 0.5 seconds, and the failures generally last for about 0-3 seconds, so that the voltage sag brings great potential safety hazards to chemical enterprises for continuous production.
Disclosure of Invention
The utility model aims to provide an adjustable intrinsic safety type voltage sag prevention device, which solves the problem of unplanned tripping and stopping accidents caused by voltage sag or electricity interference of core equipment.
The technical scheme adopted by the utility model is as follows: the utility model provides an adjustable intrinsically safe voltage sag prevention device, including the rectifier of connecting three-phase 380V main power supply and the switch QF2 of connecting three-phase 380V stand-by power supply, the rectifier output connects gradually the dc-to-ac converter, switch QF4, switch QF2 connect switch QF5, switch QF4, switch QF5 all connect static change-over switch input, the low pressure detecting element is connected through maintenance switch QF7 to static change-over switch output, contactor KM one end is connected to the low pressure detecting element, contactor KM other end is connected to the zero line, the parallel switch group is connected through load master switch QF8 to static change-over switch output, the load is connected through a plurality of load switch to the parallel switch group.
The utility model is also characterized in that:
the node of the switch QF2, which is connected with the switch QF5, is connected with one end of the maintenance switch QF6, and the other end of the maintenance switch QF6 is connected with the output end of the static change-over switch.
The output end of the inverter is connected with one end of an overhaul switch QF3, and the other end of the overhaul switch QF3 is connected with the output end of the static change-over switch.
The power supply further comprises a storage battery, the storage battery is connected with the anode of the isolation diode, and the cathode of the isolation diode is connected with the output end of the rectifier.
The low-voltage detection unit comprises four low-voltage detection modules, wherein the first low-voltage detection module is connected with the third low-voltage detection module in parallel and then is connected with the second low-voltage detection module in series, the second low-voltage detection module is connected with the fourth low-voltage detection module in parallel, and the connection node of the second low-voltage detection module and the fourth low-voltage detection module is connected with the coil of the contactor KM.
The low-voltage detection module is a low-voltage line comprehensive protection device.
The load total switch QF8 is an air switch.
The parallel switch group comprises four normally closed switches connected in parallel.
The adjustable intrinsic safety type voltage sag prevention device has the beneficial effects that:
1) The power supply of the device is optimized, and the problem of misoperation caused by tripping and power failure of the power supply of the device is solved;
2) The detection module is optimized, so that instability caused by the fault of the detection module is avoided;
3) The method changes the action mode of the contactor, prolongs the service life of the contactor, greatly improves the reliability and stability of the device, effectively reduces various unplanned parking accidents caused by voltage sag and power fluctuation of an electrical system, improves the production continuity of enterprises, and brings higher economic benefit to the enterprises.
Drawings
FIG. 1 is a flow chart of an adjustable intrinsic safety type voltage sag prevention device of the utility model.
Detailed Description
The utility model will be described in detail below with reference to the drawings and the detailed description.
The utility model discloses an adjustable intrinsic safety type voltage sag prevention device, which reduces the failure rate of various components of the device and remarkably improves the stability of the device, and as shown in figure 1, the adjustable intrinsic safety type voltage sag prevention device comprises a rectifier connected with a three-phase 380V main power supply and a switch QF2 connected with a three-phase 380V standby power supply, wherein the output end of the rectifier is sequentially connected with an inverter and a switch QF4, the switch QF2 is connected with a switch QF5, the switch QF4 and the switch QF5 are both connected with the input end of a static change-over switch, the output end of the static change-over switch is connected with a low-voltage detection unit through an overhaul switch QF7, the low-voltage detection unit is connected with one end of a contactor KM, the other end of the contactor KM is connected with a zero line, the output end of the static change-over switch is connected with a parallel switch group through a load main switch QF8, and the parallel switch group is connected with a load through a plurality of load switches; in the voltage sag device, the traditional protection mode is changed in an electric control loop, the fact that the contactor KM is not electrified and normally closed contacts of the contactor KM are used for supplying power to equipment is mainly studied, when a system fails at low voltage, the low voltage protection failure contactor KM controls the electrified contactor of the loop to attract the anti-dazzle device to disconnect a power supply, the power supply output of the anti-shake device is not influenced when the low voltage protection device and the contactor KM fail is innovated, accidents caused by the low voltage protection device and the contactor KM are avoided, and particularly, the power supply guarantee is provided for stable operation of continuous production enterprises.
According to the adjustable intrinsic safety type voltage sag prevention device, the tripping time of the low-voltage equipment power contactor KM in voltage sag is prolonged, so that the voltage sag and the power fluctuation are avoided, and the purpose of keeping continuous production of enterprises is achieved.
The node of the switch QF2, which is connected with the switch QF5, is connected with one end of the maintenance switch QF6, and the other end of the maintenance switch QF6 is connected with the output end of the static change-over switch.
The output end of the inverter is connected with one end of an overhaul switch QF3, and the other end of the overhaul switch QF3 is connected with the output end of the static change-over switch.
Meanwhile, in order to supply power in time after the static change-over switch fails, the device is additionally provided with the maintenance switch QF3 and the maintenance switch QF6, and when the static change-over switch fails, any one of the two maintenance switches QF3 and QF6 can be manually closed, so that the power supply can be continuously maintained.
The storage battery is connected with the anode of the isolation diode, and the cathode of the isolation diode is connected with the output end of the rectifier; the power supply part of the device adopts three power supplies of a rectifying direct-current energy storage inversion, a static change-over switch and a standby line, and under normal conditions, the main power supply (the bus power supply of the section) supplies power to the control loop of the low-voltage key and the core equipment through the static change-over switch after rectifying and inversion, when the bus voltage of the section is subjected to sag and power-dazzling, the storage battery inverts alternating current and supplies power, if the storage battery fails, the static change-over switch is switched to the standby power supply for supplying power, and the three power supply modes effectively ensure the stability of the low-voltage key of the section and the control loop of the core equipment when the bus voltage is subjected to sag.
The low-voltage detection unit comprises four low-voltage detection modules, wherein the first low-voltage detection module is connected with the third low-voltage detection module in parallel and then is connected with the second low-voltage detection module in series, the second low-voltage detection module is connected with the fourth low-voltage detection module in parallel, the connection node of the second low-voltage detection module and the fourth low-voltage detection module is connected with the coil of the contactor KM, the action value and the action time of the first low-voltage detection module, the second low-voltage detection module, the third low-voltage detection module and the fourth low-voltage detection module can be adjusted according to the self condition of an enterprise, the voltage value can be adjusted according to the voltage sag value of a power grid, the action time can be adjusted according to the operation characteristics and the process requirements of enterprise equipment, the low-voltage protection action value is 70% of rated voltage under the general condition, and the action time is less than 2 seconds.
The matrix detection delay adjustment part of the device is connected in series through an overhaul switch QF7, then is connected with a low-voltage monitoring unit consisting of four low-voltage monitoring modules, wherein the low-voltage monitoring units are connected in parallel and in series, and then is connected with a contactor KM coil. The matrix detection delay adjusting part formed by the low-voltage detection units in the device can well solve the problems of the rejection and misoperation of the modules, the phenomenon of misoperation or rejection of the device cannot be influenced after any low-voltage detection module of the device is in fault, and meanwhile, the voltage sag time can be adjusted according to actual conditions.
The low-voltage detection module is a low-voltage line comprehensive protection device, can use the control software of the relay protection and power distribution terminal of the Zhuhai Wanlida electric automation limited company, and has the model: MLPR-220V 266003L-1S-1000.
The load total switch QF8 is an air switch.
The parallel switch group comprises four parallel normally closed switches, such as KM1, KM2, KM3 and KM4 in fig. 1, and the parallel switch groups KM1 to KM4 are auxiliary normally closed electric shock of the contactor KM.
The execution part of the device is connected in series with a total load power switch, then is connected with a 4-weight redundant execution element formed by 4 normally-closed contacts of a contactor KM, and then is connected in series with a load switch to supply power for a control loop of the low-voltage key and core equipment. Meanwhile, in order to ensure the reliability of the executive component, four normally closed contacts of the contactor are used in parallel, when the bus voltage of the section is normal, the contactor is in a release state, and only when the bus voltage is in dip and power-shaking, the contactor is in suction operation, so that the coil burning failure rate caused by long-term operation of the contactor is reduced, and the reliability of power supply is ensured.
The utility model discloses an adjustable intrinsic safety type voltage sag prevention device which comprises a power supply part, a matrix low-voltage detection debugging part and an execution part.
1. And the power supply part adopts three power supplies of rectification direct current energy storage inversion, a static change-over switch and a standby line to supply power, so that the power supply can supply power stably when the voltage is reduced.
2. Matrix detection delay adjustment part: the device consists of four low-voltage detection modules, wherein the four low-voltage detection modules are connected in parallel and in series, so that the problems of the rejection and misoperation of the modules can be well solved, the misoperation or rejection phenomenon of the device can not be influenced after any low-voltage detection module of the device fails, and meanwhile, the voltage sag time can be adjusted according to actual conditions.
3. The execution part: the device consists of a total load power switch, an executing element and a load switch, and meanwhile, in order to ensure the reliability of the executing element, four normally closed contacts of the contactor are used in parallel, so that the coil burning failure rate caused by long-term operation of the contactor is reduced, and the reliability of power supply is ensured.
According to the adjustable intrinsic safety type voltage sag prevention device, under the condition that a low-voltage bus power supply supplies power normally, a three-wire 380V alternating current power supply supplies power to a control loop of low-voltage key and core equipment of an enterprise through a rectifier, an inverter and a static change-over switch, and the load switch QF9, the load switch QF10, the load switch QF11 and the load switch QF12 supply power to the control loop; when the low voltage monitoring module monitors that the bus power supply voltage of the section is in a sag or in a power-off state, the first low voltage detection module, the second low voltage detection module, the third low voltage detection module and the fourth low voltage detection module are in low voltage protection and act after reaching a set action value and action time, the normally open points of the first low voltage detection module, the second low voltage detection module, the third low voltage detection module and the fourth low voltage detection module are closed, and after the contactor KM coil is in power-on attraction, normally closed points KM1, KM2, KM3 and KM4 of the contactor are opened to cut off a load switching power supply, so that the voltage sag and the power-off process of the primary system are completed.
Claims (8)
1. The utility model provides an adjustable intrinsically safe voltage sag prevention device which characterized in that, including the rectifier of connecting three-phase 380V main power supply and the switch QF2 of connecting three-phase 380V stand-by power supply, the rectifier output connects gradually dc-to-ac converter, switch QF4, switch QF2 connects switch QF5, switch QF4, switch QF5 all connect static change-over switch input, static change-over switch output passes through maintenance switch QF7 and connects low pressure detecting element, contactor KM one end is connected to low pressure detecting element, contactor KM other end is connected to the zero line, the parallel switch group is connected through load master switch QF8 to static change-over switch output, the load is connected through a plurality of load switches to the parallel switch group.
2. The adjustable intrinsically safe voltage sag prevention device according to claim 1, wherein the node of the switch QF2 connected with the switch QF5 is connected with one end of an overhaul switch QF6, and the other end of the overhaul switch QF6 is connected with the output end of a static change-over switch.
3. The adjustable intrinsically safe voltage sag prevention device of claim 1, wherein the inverter output is connected to one end of an overhaul switch QF3, and the other end of the overhaul switch QF3 is connected to the static change-over switch output.
4. The adjustable intrinsically safe voltage sag prevention device of claim 1, further comprising a battery, wherein the battery is coupled to the anode of the isolation diode, and wherein the cathode of the isolation diode is coupled to the rectifier output.
5. The adjustable intrinsically safe voltage sag prevention device according to claim 1, wherein the low voltage detection unit comprises four low voltage detection modules, the first low voltage detection module is connected in parallel with the third low voltage detection module and then is connected in series with the second low voltage detection module, the second low voltage detection module is connected in parallel with the fourth low voltage detection module, and a connection node of the second low voltage detection module and the fourth low voltage detection module is connected with a coil of the contactor KM.
6. The adjustable intrinsically safe voltage sag prevention device of claim 5, wherein the low voltage detection module is a low voltage line protection device.
7. The adjustable intrinsically safe voltage dip-prevention device of claim 1 wherein the main load switch QF8 is an air switch.
8. The adjustable intrinsically-safe voltage-dip device of claim 1 wherein the set of parallel switches includes four normally-closed switches connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320681741.5U CN220066889U (en) | 2023-03-31 | 2023-03-31 | Adjustable intrinsic safety type voltage sag prevention device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320681741.5U CN220066889U (en) | 2023-03-31 | 2023-03-31 | Adjustable intrinsic safety type voltage sag prevention device |
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| Publication Number | Publication Date |
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| CN220066889U true CN220066889U (en) | 2023-11-21 |
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| CN202320681741.5U Active CN220066889U (en) | 2023-03-31 | 2023-03-31 | Adjustable intrinsic safety type voltage sag prevention device |
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