CN201733129U - Multifunctional double-load double-power automatic switching control device - Google Patents
Multifunctional double-load double-power automatic switching control device Download PDFInfo
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- CN201733129U CN201733129U CN2010202411123U CN201020241112U CN201733129U CN 201733129 U CN201733129 U CN 201733129U CN 2010202411123 U CN2010202411123 U CN 2010202411123U CN 201020241112 U CN201020241112 U CN 201020241112U CN 201733129 U CN201733129 U CN 201733129U
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Abstract
The utility model relates to a multifunctional double-load double-power automatic switching control device, which is provided with a three-phase detection signal loop. A three-phase default phase detection signal loop is directly taken from a main loop of a three-phase power source and is respectively connected into an A-phase single phase loop and a B-phase single phase loop of power main loops U1, U2 through intermediate relays KA1, KA2, KA3, KA4, and normally open contacts of the KA1, KA2, KA3 and KA4 are serially connected into an input end of a control circuit of a C phase of the power main loop U1, U2 via an 'and' logic relationship. The multifunctional double-load double-power automatic switching control device not only has a default phase protection function, but also has short circuit and overload protection and voltage loss protection functions, can automatically realize default phase detection, can automatically switch to the other power source to continue supplying power for loads when one power source is in fault, sends acousto-optic alarming, can automatically realize reverse switching after the power sources recover normally, can respectively send two obviously different alarming and prompting sound effects when in fault and when recovering normally, and has the advantages of complete function, reliable property, simple circuit structure and low cost.
Description
Technical field:
The utility model relates to a kind of open-phase protection function that has, and can carry out the multifunctional dual-load dual-power automatic switchover control device that dual-load dual-power automaticallyes switch and controls.
Background technology:
The dual-load dual-power switching controls is mainly used in three-phase alternating current (380V/220V3N-50HZ) and controls automatically for distribution.The characteristics of this class power supply control switching circuit are: its input has duplex feeding power supply U1 and U2, and its output has two-way load W1 and W2.During operate as normal, power supply U1 only powers to load W2; As power supply U1 (or U2) when breaking down, control system can fast shut-off trouble power U1 (or U2), and the load W1 (or W2) that will be connected to fault loop simultaneously automatically switches to another normal power source U2 (or U1) and continues power supply, and shows with fault alarm.At this moment, two-way load W1 and W2 will be by one road normal power source U2 (or U1) power supplies separately.The problem of Cun Zaiing has thus: (1) no phase shortage defencive function.When other two-phase phase shortage of arbitrary phase takes place when; because control system does not have phase shortage to detect and protection switching measure; cause the trouble power of phase shortage not cut off; the normal power supply power supply can not in time drop into; there is not corresponding signal prompt again; can cause the long-time phase-deficient operation of load like this, cause serious consequence.(2) trouble power recovers just often, and system can not carry out anti-switching automatically, lean on the manual operation traditional method of indicating the pronunciation of a Chinese character to change to normal operating conditions.(3) break down and recover just often to use the prompting of same sound equipment, be not easily distinguishable.
Summary of the invention:
The purpose of this utility model is to overcome the deficiencies in the prior art and provides a kind of phase shortage that has the three phase supply power supply to detect and defencive function; after power up is normal, can carry out anti-switching automatically; when breaking down and recovering just often can send respectively two kinds of differences and significantly report to the police and Tip Sound; and it is with low cost; function is comparatively complete, multifunctional dual-load dual-power automatic switchover control device stable and reliable for performance.
The purpose of this utility model is achieved in that a kind of multifunctional dual-load dual-power automatic switchover control device, comprise dual-load dual-power automatic switchover major loop and control circuit, it is characterized in that: in dual-load dual-power automatic switchover major loop, the input of major loop has two-way power supply U1 and U2, and its output has two-way load W1 and W2; The input of power supply U1 major loop links with its load W1 by the main contacts closure of automatic switch QF1 and A.C. contactor KM1, and the input of power supply U2 major loop links with its load W2 by the main contacts closure of automatic switch QF2 and A.C. contactor KM2; A.C. contactor KM3 is set between two-way power supply U1 and U2, when the arbitrary power supply among two-way power supply U1 and the U2 breaks down, its A.C. contactor elder generation dead electricity disconnects, make its load break away from the trouble power loop, by the closed conducting contact of the main contacts loop of A.C. contactor KM3, the load automatic switch that is connected to fault loop is continued power supply to another normal power source;
In the dual-load dual-power automatic switching control circuit, phase shortage is set detects the loop, its phase shortage detection signal directly is taken from the major loop of three phase mains, A1 for three phase mains U1 detects with B1 phase shortage mutually mutually, each adopts an auxiliary relay KA1 and KA2, the A1 that is connected to power supply U1 major loop respectively mutually and B1 mutually and with the single-phase loop of zero line N formation in, form A1, the phase shortage of B1 two-phase detects the loop, the phase shortage of A1 and B1 two-phase detects the normally opened contact of auxiliary relay KA1 and KA2, with " with " logical relation seal in the path that is connected to C1 control circuit mutually and go into end, the required AC220V single-phase voltage of control circuit self is directly taken from the C1 phase in the U1 three phase mains loop, the phase shortage that has constituted three phase mains U1 detects the loop, in like manner, A2 for three phase mains U2 detects with B2 phase shortage mutually mutually, each adopts an auxiliary relay KA3 and KA4, the A2 that is connected to power supply U2 major loop respectively mutually and B2 mutually and with the single-phase loop of zero line N formation in, form A2, the phase shortage of B2 two-phase detects the loop, A2, the phase shortage of B2 two-phase detects the normally opened contact of auxiliary relay KA3 and KA4, with " with " logical relation seals in the path that is connected to C2 control circuit mutually and go into end, because self required AC220V single-phase voltage of control circuit is directly taken from the C2 phase in the U2 three phase mains loop, so just constituted phase shortage detection loop to three phase mains U2; In the control loop A.C. contactor KM1 and KM2 coil power failure state, directly reflect the phase shortage situation that two-way three phase mains U1 and U2 are total separately respectively, when phase shortage takes place in arbitrary road three phase mains U1 or U2, KM1 or KM2 be dead electricity immediately, its normally-closed contact closure makes A.C. contactor KM3 control coil get electric adhesive, the closed conducting contact of main contacts loop by KM3, the load W1 or the W2 that are connected to fault loop are automatically switched to another normal power source U2 or U1 continuation power supply, thereby realize the automatic switchover of open-phase protection; In the middle of being connected to the control circuit of C phase, two auxiliary relay KA01 and KA02 are set, wherein the control coil of the KA01 phase shortage that is connected to A1, B1 two-phase detect auxiliary relay KA1 and KA2 normally opened contact " with " logical condition under, KA01 is as total detection of the three-phase phase shortage of power supply U1; The phase shortage that the control coil of KA02 is connected to A2, B2 two-phase detect auxiliary relay KA3 and KA4 normally opened contact " with " logical condition under, KA02 is as total detection of the three-phase phase shortage of power supply U2.
Control circuit employing electric whistle HAO or buzzer are equipped with red eye simultaneously as alarm sound, send two kinds of electric bell HA that distinguish significantly warning and Tip Sound effect as Tip Sound and recover just often to adopt to control respectively.
The utlity model has following good effect:
The dual-load dual-power that the utlity model has open-phase protection automaticallyes switch and controls; the technical scheme of mainly taking is: be provided with the three-phase detection signal circuit; this three-phase phase shortage detection signal loop directly is taken from the major loop of three phase mains; promptly the A that is connected to power supply major loop U1 and U2 respectively with auxiliary relay KA1, KA2 and KA3, KA4 mutually with the mutually single-phase loop of B in, KA1, KA2 and KA3, KA4 normally opened contact with " with " logical relation seal in the input of the C control circuit mutually that is connected to power supply major loop U1 and U2.
Two loads with open-phase protection---duplicate supply automaticallyes switch and controls, not only has open-phase protection, also have short circuit and overload protection simultaneously, functions such as o-volt protection can be carried out phase shortage automatically and be detected, three-phase current shows, a certain road power supply can automatically switch to another road power supply when breaking down continues electric, and sends sound and light alarm; After power up is normal, can carry out anti-switching automatically, break down and recovering just often can send respectively two kinds of differences and significantly report to the police and the Tip Sound effect.It has overcome existing low and middle-grade duplicate supply handover control systems does not have open-phase protection, can not carry out anti-switching automatically, and Failure And Recovery just often uses single defectives such as sound equipment prompting.
Therefore the utlity model has complete function, dependable performance, characteristics such as circuit structure is simple, and is cheap for manufacturing cost.
Description of drawings:
Fig. 1 is a dual-load dual-power automatic switchover main loop circuit connection diagram of the present utility model.
Fig. 2 is a dual-load dual-power automatic switching control circuit connection diagram of the present utility model.
Embodiment:
As shown in Figure 1, 2, the utility model comprises dual-load dual-power automatic switchover major loop and control circuit, it is characterized in that: in dual-load dual-power automatic switchover major loop, the input of major loop has two-way power supply U1 and U2, and its output has two-way load W1 and W2; The input of power supply U1 major loop links with its load W1 by the main contacts closure of automatic switch QF1 and A.C. contactor KM1, and the input of power supply U2 major loop links with its load W2 by the main contacts closure of automatic switch QF2 and A.C. contactor KM2; A.C. contactor KM3 is set between two-way power supply U1 and U2, when the arbitrary power supply among two-way power supply U1 and the U2 breaks down, its A.C. contactor elder generation dead electricity disconnects, make its load break away from the trouble power loop, by the closed conducting contact of the main contacts loop of A.C. contactor KM3, the load automatic switch that is connected to fault loop is continued power supply to another normal power source;
In the dual-load dual-power automatic switching control circuit, phase shortage is set detects the loop, its phase shortage detection signal directly is taken from the major loop of three phase mains, A1 for three phase mains U1 detects with B1 phase shortage mutually mutually, each adopts an auxiliary relay KA1 and KA2, the A1 that is connected to power supply U1 major loop respectively mutually and B1 mutually and with the single-phase loop of zero line N formation in, form A1, the phase shortage of B1 two-phase detects the loop, the phase shortage of A1 and B1 two-phase detects the normally opened contact of auxiliary relay KA1 and KA2, with " with " logical relation seal in the path that is connected to C1 control circuit mutually and go into end, the required AC220V single-phase voltage of control circuit self is directly taken from the C1 phase in the U1 three phase mains loop, the phase shortage that has constituted three phase mains U1 detects the loop, in like manner, A2 for three phase mains U2 detects with B2 phase shortage mutually mutually, each adopts an auxiliary relay KA3 and KA4, the A2 that is connected to power supply U2 major loop respectively mutually and B2 mutually and with the single-phase loop of zero line N formation in, form A2, the phase shortage of B2 two-phase detects the loop, A2, the phase shortage of B2 two-phase detects the normally opened contact of auxiliary relay KA3 and KA4, with " with " logical relation seals in the path that is connected to C2 control circuit mutually and go into end, because self required AC220V single-phase voltage of control circuit is directly taken from the C2 phase in the U2 three phase mains loop, so just constituted phase shortage detection loop to three phase mains U2; In the control loop A.C. contactor KM1 and KM2 coil power failure state, directly reflect the phase shortage situation that two-way three phase mains U1 and U2 are total separately respectively, when phase shortage takes place in arbitrary road three phase mains U1 or U2, KM1 or KM2 be dead electricity immediately, its normally-closed contact closure makes A.C. contactor KM3 control coil get electric adhesive, the closed conducting contact of main contacts loop by KM3, the load W1 or the W2 that are connected to fault loop are automatically switched to another normal power source U2 or U1 continuation power supply, thereby realize the automatic switchover of open-phase protection; In the middle of being connected to the control circuit of C phase, two auxiliary relay KA01 and KA02 are set, wherein the control coil of the KA01 phase shortage that is connected to A1, B1 two-phase detect auxiliary relay KA1 and KA2 normally opened contact " with " logical condition under, KA01 is as total detection of the three-phase phase shortage of power supply U1; The phase shortage that the control coil of KA02 is connected to A2, B2 two-phase detect auxiliary relay KA3 and KA4 normally opened contact " with " logical condition under, KA02 is as total detection of the three-phase phase shortage of power supply U2.
Control circuit employing electric whistle HAO or buzzer are equipped with red eye simultaneously as alarm sound, send two kinds of electric bell HA that distinguish significantly warning and Tip Sound effect as Tip Sound and recover just often to adopt to control respectively.The phase shortage that has the three phase supply power supply detects and defencive function; after power up is normal, can carry out anti-switching automatically, when breaking down and recover just often can send respectively two kinds of differences and significantly report to the police and Tip Sound, and with low cost; function is comparatively complete, and is stable and reliable for performance.
The input of its major loop has two-way power supply U1 and U2, and its output has two-way load W1 and W2.Power supply U1 major loop links with its load W1 by the main contacts closure of A.C. contactor KM1; Power supply U2 major loop links with its load W2 by the main contacts closure of A.C. contactor KM2; Under the control of control circuit, when a certain power supply breaks down, its A.C. contactor elder generation dead electricity disconnects, make its load break away from the trouble power loop, by the closed conducting contact of the main contacts loop of A.C. contactor KM3, the load automatic switch that is connected to fault loop is continued power supply to another normal power source.Power supply U1 and U2 major loop are gone into the automatic switch QF1 of end and the main effect of QF2 is overload protection and short-circuit protection; Each all has ammeter to indicate the situation of each phase current mutually in the major loop of two-way three phase mains, detects with the phase shortage that cooperates control circuit.
Phase shortage is set in its control circuit detects the loop, its phase shortage detection signal directly is taken from the major loop of three phase mains, A1 for three phase mains U1 detects with B1 phase shortage mutually mutually, each adopts an auxiliary relay KA1 and KA2, the A1 that is connected to power supply U1 major loop respectively mutually and B1 mutually and in the single-phase loop that constitutes with zero line N, the phase shortage detection loop of formation A1, B1 two-phase.The phase shortage of A1 and B1 two-phase detects the normally opened contact of auxiliary relay KA1 and KA2, with " with " logical relation seal in the path that is connected to C1 control circuit mutually and go into end.Because the required AC220V single-phase voltage of control circuit self is directly taken from the C1 phase (being that the phase shortage that control circuit self has comprised the C1 phase detects) in the U1 three phase mains loop, the phase shortage that has so just constituted three phase mains U1 detects the loop.In like manner, A2 for three phase mains U2 detects with B2 phase shortage mutually mutually, each adopts an auxiliary relay KA3 and KA4, the A2 that is connected to power supply U2 major loop respectively mutually and B2 mutually and with the single-phase loop of zero line N formation in, the phase shortage that forms A2, B2 two-phase detects the loop, the phase shortage of A2, B2 two-phase detects the normally opened contact of auxiliary relay KA3 and KA4, with " with " logical relation seals in the path that is connected to C2 control circuit mutually and go into end.Because self required AC220V single-phase voltage of control circuit is directly taken from the C2 phase (being that the phase shortage that control circuit self has comprised the C2 phase detects) in the U2 three phase mains loop, has so just constituted the phase shortage detection loop to three phase mains U2.In the control loop A.C. contactor KM1 and KM2 coil power failure state; directly reflect the phase shortage situation that two-way three phase mains U1 and U2 are total separately respectively; when being arbitrary road three phase mains U1 (or U2) generation phase shortage; KM1 (or KM2) is dead electricity immediately; its normally-closed contact closure makes A.C. contactor KM3 control coil get electric adhesive; the closed conducting contact of main contacts loop by KM3; the load W1 (or W2) that is connected to fault loop is automatically switched to another normal power source U2 (or U1) continue power supply, thereby realize the automatic switchover of open-phase protection.
In the middle of being connected to the control circuit of C phase, two auxiliary relay KA01 and KA02 are set.Wherein the control coil of the KA01 phase shortage that is connected to A1, B1 two-phase detect auxiliary relay KA1 and KA2 normally opened contact " with " logical condition under, promptly KA01 is as total detection of the three-phase phase shortage of power supply U1; The phase shortage that the control coil of KA02 is connected to A2, B2 two-phase detect auxiliary relay KA3 and KA4 normally opened contact " with " logical condition under, promptly KA02 is as total detection of the three-phase phase shortage of power supply U2; The main effect of auxiliary relay KA01 and KA02 is: after fault is got rid of, when three phase mains U1 (or U2) recovers normal power supply, KA01 (or KA02), its normally-closed contact action, cut off KM3 earlier, then make KM1 (or KM2) regain electricity, thereby anti-switching telegram in reply source U1 is to load W1, the power supply U2 state to the normal power supply of load W2 automatically.
Control circuit adopts electric whistle HAO (or buzzer) as alarm sound (being equipped with red eye simultaneously), and recovers just often to adopt electric bell HA as Tip Sound.Can control respectively and send two kinds of differences significantly warning and Tip Sound effect.
Two loads with open-phase protection---duplicate supply automatic switching control system has 4 kinds of controls (work) state: (1) normal operating conditions.(2) automatic switchover during fault.(3) the automatic anti-switching after the recovery.(4) manual-operated emergent switching state.
Claims (2)
1. multifunctional dual-load dual-power automatic switchover control device, comprise dual-load dual-power automatic switchover major loop and control circuit, it is characterized in that: in dual-load dual-power automatic switchover major loop, the input of major loop has two-way power supply U1 and U2, and its output has two-way load W1 and W2; The input of power supply U1 major loop links with its load W1 by the main contacts closure of automatic switch QF1 and A.C. contactor KM1, and the input of power supply U2 major loop links with its load W2 by the main contacts closure of automatic switch QF2 and A.C. contactor KM2; A.C. contactor KM3 is set between two-way power supply U1 and U2, when the arbitrary power supply among two-way power supply U1 and the U2 breaks down, its A.C. contactor elder generation dead electricity disconnects, make its load break away from the trouble power loop, by the closed conducting contact of the main contacts loop of A.C. contactor KM3, the load automatic switch that is connected to fault loop is continued power supply to another normal power source;
In the dual-load dual-power automatic switching control circuit, phase shortage is set detects the loop, its phase shortage detection signal directly is taken from the major loop of three phase mains, A1 for three phase mains U1 detects with B1 phase shortage mutually mutually, each adopts an auxiliary relay KA1 and KA2, the A1 that is connected to power supply U1 major loop respectively mutually and B1 mutually and with the single-phase loop of zero line N formation in, form A1, the phase shortage of B1 two-phase detects the loop, the phase shortage of A1 and B1 two-phase detects the normally opened contact of auxiliary relay KA1 and KA2, with " with " logical relation seal in the path that is connected to C1 control circuit mutually and go into end, the required AC220V single-phase voltage of control circuit self is directly taken from the C1 phase in the U1 three phase mains loop, the phase shortage that has constituted three phase mains U1 detects the loop, in like manner, A2 for three phase mains U2 detects with B2 phase shortage mutually mutually, each adopts an auxiliary relay KA3 and KA4, the A2 that is connected to power supply U2 major loop respectively mutually and B2 mutually and with the single-phase loop of zero line N formation in, form A2, the phase shortage of B2 two-phase detects the loop, A2, the phase shortage of B2 two-phase detects the normally opened contact of auxiliary relay KA3 and KA4, with " with " logical relation seals in the path that is connected to C2 control circuit mutually and go into end, because self required AC220V single-phase voltage of control circuit is directly taken from the C2 phase in the U2 three phase mains loop, so just constituted phase shortage detection loop to three phase mains U2; In the control loop A.C. contactor KM1 and KM2 coil power failure state, directly reflect the phase shortage situation that two-way three phase mains U1 and U2 are total separately respectively, when phase shortage takes place in arbitrary road three phase mains U1 or U2, KM1 or KM2 be dead electricity immediately, its normally-closed contact closure makes A.C. contactor KM3 control coil get electric adhesive, the closed conducting contact of main contacts loop by KM3, the load W1 or the W2 that are connected to fault loop are automatically switched to another normal power source U2 or U1 continuation power supply, thereby realize the automatic switchover of open-phase protection; In the middle of being connected to the control circuit of C phase, two auxiliary relay KA01 and KA02 are set, wherein the control coil of the KA01 phase shortage that is connected to A1, B1 two-phase detect auxiliary relay KA1 and KA2 normally opened contact " with " logical condition under, KA01 is as total detection of the three-phase phase shortage of power supply U1; The phase shortage that the control coil of KA02 is connected to A2, B2 two-phase detect auxiliary relay KA3 and KA4 normally opened contact " with " logical condition under, KA02 is as total detection of the three-phase phase shortage of power supply U2.
2. multifunctional dual-load dual-power automatic switchover control device according to claim 1, it is characterized in that: control circuit adopts electric whistle HAO or buzzer as alarm sound, be equipped with red eye simultaneously, send two kinds of electric bell HA that distinguish significantly warning and Tip Sound effect as Tip Sound and recover just often to adopt to control respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010202411123U CN201733129U (en) | 2010-06-29 | 2010-06-29 | Multifunctional double-load double-power automatic switching control device |
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| CN2010202411123U CN201733129U (en) | 2010-06-29 | 2010-06-29 | Multifunctional double-load double-power automatic switching control device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101908778A (en) * | 2010-06-29 | 2010-12-08 | 河南省电力公司许昌供电公司 | Multifunctional dual-load dual-power automatic switchover control device |
| CN102957199A (en) * | 2011-08-18 | 2013-03-06 | 王丕忠 | Dual-power safety switching circuit |
| CN104221249A (en) * | 2012-01-18 | 2014-12-17 | 康明斯发电Ip公司 | Transfer switch |
| CN104993577A (en) * | 2015-07-22 | 2015-10-21 | 上海高桥捷派克石化工程建设有限公司 | Power supply control system |
| CN106300647A (en) * | 2016-10-18 | 2017-01-04 | 广西电网有限责任公司电力科学研究院 | A kind of adaptive switched method of supplying power to of outdoor test instrument |
| CN106655466A (en) * | 2016-11-10 | 2017-05-10 | 国网浙江省电力公司金华供电公司 | Power supply loop for communication power supply |
| CN110398894A (en) * | 2018-04-24 | 2019-11-01 | 四川东方电气自动控制工程有限公司 | Digital electro-hydraulic control device solenoid valve DC power supply switching system and method |
| CN113314361A (en) * | 2021-06-11 | 2021-08-27 | 中煤科工集团信息技术有限公司 | Cable rapid alternate power supply replacing device and method suitable for multi-equipment group |
| WO2022042109A1 (en) * | 2020-08-24 | 2022-03-03 | 安徽动力源科技有限公司 | Dual input circuit |
| CN114830489A (en) * | 2020-10-28 | 2022-07-29 | 华为数字能源技术有限公司 | Power supply system and control method |
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- 2010-06-29 CN CN2010202411123U patent/CN201733129U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101908778A (en) * | 2010-06-29 | 2010-12-08 | 河南省电力公司许昌供电公司 | Multifunctional dual-load dual-power automatic switchover control device |
| CN102957199A (en) * | 2011-08-18 | 2013-03-06 | 王丕忠 | Dual-power safety switching circuit |
| CN104221249B (en) * | 2012-01-18 | 2017-05-24 | 康明斯发电Ip公司 | Transfer switch |
| CN104221249A (en) * | 2012-01-18 | 2014-12-17 | 康明斯发电Ip公司 | Transfer switch |
| CN104993577A (en) * | 2015-07-22 | 2015-10-21 | 上海高桥捷派克石化工程建设有限公司 | Power supply control system |
| CN106300647A (en) * | 2016-10-18 | 2017-01-04 | 广西电网有限责任公司电力科学研究院 | A kind of adaptive switched method of supplying power to of outdoor test instrument |
| CN106300647B (en) * | 2016-10-18 | 2023-06-16 | 广西电网有限责任公司电力科学研究院 | Self-switching power supply method for outdoor tester |
| CN106655466A (en) * | 2016-11-10 | 2017-05-10 | 国网浙江省电力公司金华供电公司 | Power supply loop for communication power supply |
| CN110398894A (en) * | 2018-04-24 | 2019-11-01 | 四川东方电气自动控制工程有限公司 | Digital electro-hydraulic control device solenoid valve DC power supply switching system and method |
| WO2022042109A1 (en) * | 2020-08-24 | 2022-03-03 | 安徽动力源科技有限公司 | Dual input circuit |
| CN114830489A (en) * | 2020-10-28 | 2022-07-29 | 华为数字能源技术有限公司 | Power supply system and control method |
| CN114830489B (en) * | 2020-10-28 | 2024-03-26 | 华为数字能源技术有限公司 | Power supply system and control method |
| CN113314361A (en) * | 2021-06-11 | 2021-08-27 | 中煤科工集团信息技术有限公司 | Cable rapid alternate power supply replacing device and method suitable for multi-equipment group |
| CN113314361B (en) * | 2021-06-11 | 2023-07-25 | 中煤科工集团信息技术有限公司 | Cable rapid alternating power supply replacement device and method suitable for multiple equipment groups |
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