CN216413986U - Economical dual-power automatic switching control system - Google Patents
Economical dual-power automatic switching control system Download PDFInfo
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- CN216413986U CN216413986U CN202122503290.XU CN202122503290U CN216413986U CN 216413986 U CN216413986 U CN 216413986U CN 202122503290 U CN202122503290 U CN 202122503290U CN 216413986 U CN216413986 U CN 216413986U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The utility model relates to the technical field of power distribution and power utilization, in particular to an economical dual-power automatic switching control system, which comprises a main loop and a dual-power automatic switching control loop; the main loop is used for supplying power to the dual-power automatic switching control loop, and the dual-power automatic switching control loop is used for controlling the dual-power automatic switching. The dual power supplies in the system are mutually standby power supplies, when the first power supply loses power due to a certain reason, the second power supply automatically starts to work after 0.2-0.5 of time delay through a time relay KT1 or KT2, and the continuity of power utilization is guaranteed. That is, when the three phases are simultaneously lost, the standby power supply can be switched on when the voltage of the power-lost line is ensured to be free from voltage, and on the contrary, the switch is prohibited to be switched on in any way.
Description
Technical Field
The utility model relates to the technical field of power distribution and power utilization, in particular to an economical dual-power automatic switching control system.
Background
The dual power supply has high power supply reliability, stability and continuity. The power supply of a specific place must adopt dual power supply or automatic switching of a power supply II. The dual-power supply is mainly applied to special loads and first-class loads, namely electrodes are stopped, special and serious accidents and harassment occur in a short time, and the serious accidents run to the top of life and property safety of people or important equipment are seriously threatened. The double power supply switching is mainly realized by an automatic switch or an alternating current contactor when the load is not large, or by a device which can be manually switched when a certain safety distance exists through secondary wiring.
This application has the problem based on the switch board dual supply switching control circuit wiring that the application unit used: two 350A air switches are used for switching the double power supplies in a specific wiring loop, and when the power distribution cabinet is switched on and switched off, the two box transformer low-voltage side circuit breakers are tripped. Because one cable connector is ignited to cause phase failure, a non-electrician does not disconnect the first power switch during operation, and switches on the second power switch to cause short circuit between the first power switch L11 and the second power switch L3 and between the second power switch L22 and the second power switch L23, potential safety hazards are left on power supply and consumer equipment and electricity consumption of personnel.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model provides an economical dual-power automatic switching control system.
In order to achieve the purpose, the utility model provides the following technical scheme:
an economical dual-power automatic switching control system comprises a main loop and a dual-power automatic switching control loop; the main loop is used for supplying power to a dual-power automatic switching control loop, and the dual-power automatic switching control loop controls automatic switching of dual power;
the main circuit comprises a first power supply, a second power supply and a power supply main bus, live wires L11, L12 and L13 of the first power supply are connected with a breaker QF1 in series, the other end of the breaker QF1 is connected with a fuse FU1 in series, the fuse FU2 and the fuse FU3 are connected with an alternating current contactor KM1, the other end of the alternating current contactor KM1 is connected with a current transformer 1TAu, a current transformer 1TAv and a current transformer 1TAw in series and then connected with the power supply main bus L1, L2 and L3 to complete power supply; the live wires L21, L22 and L23 of the second power supply are connected with a breaker QF2 in series, the other end of the breaker QF2 is connected with an alternating current contactor KM2 through a fuse FU4, a fuse FU5 and a fuse FU6 in sequence, and the other end of the alternating current contactor KM2 is connected with a current transformer 2TAu, a current transformer 2TAv and a current transformer 2TAw in series and then connected with L1, L2 and L3 of a power supply main bus to complete power supply; and the zero lines LN1 and LN2 of the first power supply and the second power supply are respectively connected with a power supply main bus LN.
As an optimized technical scheme of the utility model, a relay K2 coil, a relay K3 coil and a relay K4 coil are respectively connected between a live wire and a zero line LN1 which are connected with the breaker QF 1; and a relay K1 coil is connected between live wires L11 and L12 connected with the circuit breaker QF 1.
As an optimized technical scheme of the utility model, a relay K7 coil, a relay K8 coil and a relay K9 coil are respectively connected between a live wire and a zero line LN1 which are connected with the breaker QF 2.
As an optimized technical scheme of the utility model, the output ends of L1, L2 and L3 of the power supply main bus are connected with a breaker QF4, a breaker QF5 and a breaker QF6 in parallel, the other ends of the breaker QF4, the breaker QF5 and the breaker QF6 are respectively connected with an alternating current contactor KM3, an alternating current contactor KM4 and an alternating current contactor KM5, and the other ends of the alternating current contactor KM3, the alternating current contactor KM4 and the alternating current contactor KM5 are respectively connected with a capacitor C1, a capacitor C2 and a capacitor C3; the common terminal of the three capacitors C1, C2, C3 is grounded.
As an optimized technical scheme of the utility model, the dual-power automatic switching control loop comprises a dual-power control loop and a self-switching loop connected in parallel with the dual-power control loop; the automatic switching circuit comprises a power supply one monitoring circuit, a power supply two monitoring circuit, a power supply one manual switching-off/closing circuit, a power supply one self-holding circuit, a KM1 automatic switching-on circuit, a KM1 switching-on indicating circuit, a power supply one spare power automatic switching-on starting circuit, a power supply two manual switching-off/closing circuit, a power supply two self-holding circuit, a KM2 automatic switching-on circuit, a KM2 switching-on indicating circuit, a power supply two spare power automatic switching-on starting circuit, a power supply one overcurrent quick-break protection circuit, a power supply two overcurrent quick-break protection circuit and a KM1 and KM2 total stop indicating circuit.
As an optimized technical scheme of the utility model, the power supply I monitoring loop is responsible for monitoring whether a power supply I has voltage or not, and when an SA transfer switch is switched to a5-6 contact, an SB2 is pressed to manually switch on an alternating current contactor KM1 of the power supply I; pressing SB1 to manually open the AC contactor KM1 of the first power supply;
the monitoring circuit of the second power supply is used for monitoring whether the second power supply has voltage or not, when the SA change-over switch is switched to a 7-8 contact, the AC contactor KM2 of the second power supply is manually switched on by pressing SB4, and the AC contactor KM2 of the second power supply is manually switched off by pressing SB 3;
when the first power supply is powered off and delayed for 0.2-0.5s by a time relay KT1 or KT2, the second power supply AC contactor KM2 is automatically switched on; when the load carried by the first power supply is overlarge, any one or three of the current transformer 1TAu, the current transformer 1TAv and the current transformer 1TAw connected in the loop of the first power supply act simultaneously to send a tripping command to the overcurrent relays 11KA, 12KA and 13KA so as to protect equipment;
when the first power supply works, the three-phase power supply loses power, and after 0.2-0.5s of time delay through a time relay KT1 or KT2, the second power supply AC contactor KM1 is automatically switched on; when the load carried by the power supply II is overlarge, any one or three of the current transformer 2TAu, the current transformer 2TAv and the current transformer 2TAw connected in the loop of the power supply II act simultaneously to send a tripping command to the overcurrent relays 21KA, 22KA and 23KA so as to protect equipment.
As an optimized technical scheme of the utility model, the dual-power control loop consists of a normally open contact of a relay K1, a live wire L13 of a first power supply, a live wire L23 of a second power supply, two circuit breakers QF3, a main stop switch JSB, an electrified indicator lamp HD and a zero line LN1 of the first power supply; the normally open contact of the relay K1 is connected between live wires L13 and L23 of a first power supply, the other end of the normally open contact of the relay K1 is connected with a circuit breaker QF3, the other end of the circuit breaker QF3 is connected with an electrified indicating lamp HD, the other end of the electrified indicating lamp HD is connected with a circuit breaker QF3, and the circuit breaker QF3 is connected with a zero line LN1 of the first power supply to form a dual-power-supply control loop.
Compared with the prior art, the utility model has the following beneficial effects:
the dual power supplies in the system are mutually standby power supplies, when the first power supply loses power due to a certain reason and is delayed by 0.2-0.5 through a time relay KT1 or KT2, the second power supply automatically starts to work, and the continuity of power utilization is guaranteed. That is, when the three phases of the first power supply and the second power supply are simultaneously powered off, the standby power supply can be switched on when the power-off line is ensured to have no voltage, and on the contrary, the switch is prohibited from being switched on in any way. The method specifically comprises the following steps:
(1) when any one or two phases of the power supply are cut off, the spare power automatic switching device does not act, and only when the three phases are completely cut off, the spare power automatic switching device acts. The reason is to prevent the short circuit accident caused by the non-synchronous parallel of the first power supply and the second power supply, although the double power supplies are strictly checked before supplying power, the double power supplies are not allowed to supply power to the load from safety regulation and operation regulation. But can send out one-phase or two-phase broken line alarm to remind the operator to pay attention.
(2) When any one or two phases of the power supply are cut off, the spare power automatic switching device does not act, and only when the three phases are completely cut off, the spare power automatic switching device acts. The reason is that when the power supply II works, the power supply I restores to the normal power supply, and the switch is automatically switched to the power supply I to work and pushes out the power supply II. The connection is used for distinguishing the first power supply from the second power supply, and the connection is simpler and accords with the principle of optimizing and improving equipment and saving investment.
(3) The key point of the application of K1 is that when the power supply is charged, K1 ensures that the control loop is charged by connecting with the power supply through its normally closed contact. When the power supply loses power, the K1 switches on the power supply by using a normally closed contact of the K1, so that the whole set of control loop is provided with reliable control power supply. This method is entirely feasible for use in other demanding control loops.
(4) When one phase or two phases are cut off, the spare power automatic switching device does not act and gives an alarm. The normally closed contacts of power supply relays K2, K3 and K4 are used as a signal starting circuit for sending out one-phase or two-phase power failure. The second power supply needs to use the normally closed contacts of the independent relay K7, the relay K8 and the relay K9 as a signal starting circuit for sending out one-phase or two-phase power failure.
(5) The total capacity of the capacitance compensation interval is 96Kvar, the capacity of the power supply total bus is 300KVA, and 1-12 outgoing lines can be designed.
Drawings
FIG. 1 is a circuit diagram of the main loop of the system of the present invention;
FIG. 2 is a circuit diagram of a dual power automatic switching control loop of the system of the present invention;
FIG. 3 is a supply bus voltage measurement loop of the system of the present invention;
FIG. 4 is a diagram of an in-tray layout of the system of the present invention;
fig. 5 is a diagram of an off-disk layout of the system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Example 1
Referring to fig. 1-5, an economical dual power automatic switching control system according to the present invention includes a main circuit and a dual power automatic switching control circuit; the main loop is used for supplying power to the dual-power automatic switching control loop, and the dual-power automatic switching control loop controls the dual-power automatic switching;
the main circuit comprises a power supply I, a power supply II and a power supply main bus, live wires L11, L12 and L13 of the power supply I are connected with a breaker QF1 in series, the other end of the breaker QF1 is connected with a fuse FU1 in series in sequence, the fuse FU2 and the fuse FU3 are connected with an alternating current contactor KM1, the other end of the alternating current contactor KM1 is connected with a current transformer 1TAu, a current transformer 1TAv and a current transformer 1TAw in series and then connected with the power supply main bus L1, L2 and L3 to complete power supply; the live wires L21, L22 and L23 of the power supply II are connected with a breaker QF2 in series, the other end of the breaker QF2 is connected with an alternating current contactor KM2 through a fuse FU4, a fuse FU5 and a fuse FU6 in sequence, and the other end of the alternating current contactor KM2 is connected with a current transformer 2TAu, a current transformer 2TAv and a current transformer 2TAw in series and then connected with L1, L2 and L3 of a power supply main bus to complete power supply; and neutral lines LN1 and LN2 of the first power supply and the second power supply are respectively connected with a power supply main bus LN.
Preferably, a relay K2 coil, a relay K3 coil and a relay K4 coil are respectively connected between a live wire and a zero line LN1 which are connected with the breaker QF 1; a relay K1 coil is connected between live wires L11 and L12 connected with the breaker QF 1.
Preferably, a relay K7 coil, a relay K8 coil and a relay K9 coil are respectively connected between a live wire and a neutral wire LN1 connected with the breaker QF 2.
Preferably, the output ends of L1, L2 and L3 of the power supply main bus are connected with a breaker QF4, a breaker QF5 and a breaker QF6 in parallel, the other ends of the breaker QF4, the breaker QF5 and the breaker QF6 are respectively connected with an alternating current contactor KM3, an alternating current contactor KM4 and an alternating current contactor KM5, and the other ends of the alternating current contactor KM3, the alternating current contactor KM4 and the alternating current contactor KM5 are respectively connected with a capacitor C1, a capacitor C2 and a capacitor C3; the common terminal of the three capacitors C1, C2, C3 is grounded.
Optimally, the dual-power automatic switching control loop comprises a dual-power control loop and a self-switching loop connected with the dual-power control loop in parallel; the automatic switching loop comprises a power supply one monitoring loop, a power supply two monitoring loop, a power supply one manual switching-off/switching-on loop, a power supply one self-holding loop, a KM1 automatic switching-on loop, a KM1 switching-on indicating loop, a power supply one standby automatic switching-on starting loop, a power supply two manual switching-off/switching-on loop, a power supply two self-holding loop, a KM2 automatic switching-on loop, a KM2 switching-on indicating loop, a power supply two standby automatic switching-on starting loop, a power supply one overcurrent quick-break protection loop, a power supply two overcurrent quick-break protection loop, and a KM1 and KM2 total stop indicating loop.
Preferably, the power supply I monitoring loop is used for monitoring the voltage of the power supply I, and when the SA change-over switch is switched to a5-6 contact, the SB2 is pressed to manually switch on the alternating current contactor KM1 of the power supply I; pressing SB1 to manually open the AC contactor KM1 of the first power supply; the monitoring circuit of the second power supply is used for monitoring whether the second power supply has voltage or not, when the SA change-over switch is switched to a 7-8 contact, the AC contactor KM2 of the second power supply is manually switched on by pressing SB4, and the AC contactor KM2 of the second power supply is manually switched off by pressing SB 3; when the first power supply is powered off and delayed for 0.2-0.5s by a time relay KT1 or KT2, the second power supply AC contactor KM2 is automatically switched on; when the load carried by the first power supply is overlarge, any one or three of the current transformer 1TAu, the current transformer 1TAv and the current transformer 1TAw connected in the loop of the first power supply act simultaneously to send a tripping command to the overcurrent relays 11KA, 12KA and 13KA so as to protect equipment; when the first power supply works, the three-phase power supply loses power, and after 0.2-0.5s of time delay through a time relay KT1 or KT2, the second power supply AC contactor KM1 is automatically switched on; when the load carried by the power supply II is overlarge, any one or three of the current transformer 2TAu, the current transformer 2TAv and the current transformer 2TAw connected in the loop of the power supply II act simultaneously to send a tripping command to the overcurrent relays 21KA, 22KA and 23KA so as to protect equipment.
The optimized dual-power control loop consists of a normally open contact of a relay K1, a live wire L13 of a first power supply, a live wire L23 of a second power supply, two circuit breakers QF3, a main stop switch JSB, an electrified indicator lamp HD and a zero line LN1 of the first power supply; the normally open contact of the relay K1 is connected between live wires L13 and L23 of the first power supply, the other end of the normally open contact of the relay K1 is connected with a circuit breaker QF3, the other end of the circuit breaker QF3 is connected with an electrified indicating lamp HD, the other end of the electrified indicating lamp HD is connected with a circuit breaker QF3, and the circuit breaker QF3 is connected with a zero line LN1 of the first power supply to form a dual-power-supply control loop.
Example 2
Based on embodiment 1, as shown in the attached fig. 1-5, the working principle of the system is as follows:
(1) the first power supply works, and the second power supply automatically realizes the automatic switching of the spare power:
If the external fault of the power supply I is eliminated, the equipment is switched to the power supply I from the power supply II to work once an external circuit is switched on. The reason is that when the power supply I is cut off, the normally open contacts of the K2, the K3 and the relay K4 in the power supply I act to cut off the power supply of the KA1 coil, and the normally open contacts of the KA1 connected to the front ends of the SA1-2 and the SA 9-10 are cut off to cut off a closing loop of the power supply I. Meanwhile, the normally closed contacts of the relays K2, K3 and K4 are operated to switch on the power supply of the KA2 coil, and the normally open contact of the KA2 connected to the front ends of the SA3-4 and SA 11-12 is closed to prepare for the second starting of the power supply.
In addition, the KA4 intermediate relay connected in the loop of the second power supply aims to utilize a pair of normally open contacts of the second power supply to be connected with the KT2 in parallel, so that the reliability of the KT2 is improved by realizing self-holding after the second power supply is switched on, and the failure of starting of the spare power automatic switching device caused by poor dislocation contact of the KT2 contacts is prevented. The purpose of the KA3 intermediate relay connected in a power supply loop is the same as that of the intermediate relay, and the description is not repeated.
K1 is connected to the purpose of the power supply I; when the power supply I is electrified through the coil of the QF1 and the K1, the K1 normally-open contact is connected with the live wire L13 of the power supply I, so that the whole loop is electrified. When the first power supply is powered off, the coil of the K1 is powered off, the normally open contact of the K1 disconnects the live wire L13 of the first power supply and connects the live wire L23 of the second power supply, and the whole control loop is electrified. The connection method greatly improves the reliability of the dual-power supply user for controlling the opening/closing of the circuit breaker by adopting the alternating-current power supply for the loop.
(2) Power supply one hand switch
And SA is switched to a manual position SA5-6 to be connected with a power supply control loop, the current passes through an SB1 stop button, the SB2 current is pressed to be attracted in an electrified way through a KM2 normally closed contact KM1 coil, a KM1 normally open contact connected below SB2 is closed to realize self-holding, and a power supply closing indicator lamp HD3 is lightened to finish closing. And a KM1 normally closed contact connected with the front end of KM2 is opened to realize the interlocking of the two switches. The SB1 is simply pressed to stop the power supply. The manual power supply switching-on is completely consistent with the manual power supply switching-on, and repeated introduction can be omitted only by changing the corresponding equipment number.
(3) When the load of the first power supply is overlarge, any one or three of the current transformer 1TAu, the current transformer 1TAv and the current transformer 1TAw connected in the self-generating loop act simultaneously to give a tripping command to the overcurrent relays 11KA, 12KA and 13KA, and a K5 contact connected in a closing loop of the alternating current contactor KM1 opens the protection equipment. When the load carried by the power supply II is overlarge, any one or three of the current transformer 2TAu, the current transformer 2TAv and the current transformer 2TAw connected in the loop of the power supply II act simultaneously to send a tripping command to the overcurrent relays 21KA22KA and 23KA, and a K6 contact connected in a closing loop of the AC contactor KM2 opens the protection equipment.
(4) The first power supply monitoring circuit is used for monitoring whether a first power supply has voltage or not, and when the SA change-over switch is switched to a5-6 contact, the SB2 is pressed to manually switch on the alternating current contactor KM1 of the first power supply; pressing SB1 is to manually open ac contactor KM1 of power one.
(5) And the monitoring circuit of the second power supply is used for monitoring the voltage of the second power supply, when the SA change-over switch is switched to a 7-8 contact, the AC contactor KM2 of the second power supply is manually switched on by pressing the SB4, and the AC contactor KM2 of the second power supply is manually switched off by pressing the SB 3.
(6) When the first power supply is powered off and delayed for 0.2-0.5s by a time relay KT1 or KT2, the second power supply AC contactor KM2 is automatically switched on; when the load carried by the first power supply is overlarge, any one or three of the current transformer 1TAu, the current transformer 1TAv and the current transformer 1TAw connected in the loop of the first power supply act simultaneously to give a tripping command to the overcurrent relays 11KA, 12KA and 13KA so as to protect equipment.
(7) When the first power supply works, the three-phase power supply loses power, and after 0.2-0.5s of time delay through a time relay KT1 or KT2, the second power supply AC contactor KM1 is automatically switched on; when the load carried by the power supply II is overlarge, any one or three of the current transformer 2TAu, the current transformer 2TAv and the current transformer 2TAw connected in the loop of the power supply II act simultaneously to send a tripping command to the overcurrent relays 21KA, 22KA and 23KA so as to protect equipment.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides an economic dual supply automatic switching control system which characterized in that: the system comprises a main loop and a dual-power automatic switching control loop; the main loop is used for supplying power to a dual-power automatic switching control loop, and the dual-power automatic switching control loop controls automatic switching of dual power;
the main circuit comprises a first power supply, a second power supply and a power supply main bus, live wires L11, L12 and L13 of the first power supply are connected with a breaker QF1 in series, the other end of the breaker QF1 is connected with a fuse FU1 in series, the fuse FU2 and the fuse FU3 are connected with an alternating current contactor KM1, the other end of the alternating current contactor KM1 is connected with a current transformer 1TAu, a current transformer 1TAv and a current transformer 1TAw in series and then connected with the power supply main bus L1, L2 and L3 to complete power supply; the live wires L21, L22 and L23 of the second power supply are connected with a breaker QF2 in series, the other end of the breaker QF2 is connected with an alternating current contactor KM2 through a fuse FU4, a fuse FU5 and a fuse FU6 in sequence, and the other end of the alternating current contactor KM2 is connected with a current transformer 2TAu, a current transformer 2TAv and a current transformer 2TAw in series and then connected with L1, L2 and L3 of a power supply main bus to complete power supply; and the zero lines LN1 and LN2 of the first power supply and the second power supply are respectively connected with a power supply main bus LN.
2. The economical dual-power automatic switching control system according to claim 1, characterized in that: a relay K2 coil, a relay K3 coil and a relay K4 coil are connected between a live wire and a zero line LN1 which are connected with the breaker QF1 respectively; and a relay K1 coil is connected between live wires L11 and L12 connected with the circuit breaker QF 1.
3. The economical dual-power automatic switching control system according to claim 1, characterized in that: and a relay K7 coil, a relay K8 coil and a relay K9 coil are respectively connected between the live wire connected with the breaker QF2 and the zero line LN 1.
4. The economical dual-power automatic switching control system according to claim 1, characterized in that: the output ends of L1, L2 and L3 of the power supply main bus are connected with a breaker QF4, a breaker QF5 and a breaker QF6 in parallel; the other ends of the breaker QF4, the breaker QF5 and the breaker QF6 are respectively connected with an alternating current contactor KM3, an alternating current contactor KM4 and an alternating current contactor KM5, and the other ends of the alternating current contactor KM3, the alternating current contactor KM4 and the alternating current contactor KM5 are respectively connected with a capacitor C1, a capacitor C2 and a capacitor C3; the common terminal of the three capacitors C1, C2, C3 is grounded.
5. The economical dual-power automatic switching control system according to claim 1, characterized in that: the dual-power automatic switching control loop comprises a dual-power control loop and a self-switching loop connected with the dual-power control loop in parallel; the automatic switching circuit comprises a power supply one monitoring circuit, a power supply two monitoring circuit, a power supply one manual switching-off/closing circuit, a power supply one self-holding circuit, a KM1 automatic switching-on circuit, a KM1 switching-on indicating circuit, a power supply one spare power automatic switching-on starting circuit, a power supply two manual switching-off/closing circuit, a power supply two self-holding circuit, a KM2 automatic switching-on circuit, a KM2 switching-on indicating circuit, a power supply two spare power automatic switching-on starting circuit, a power supply one overcurrent quick-break protection circuit, a power supply two overcurrent quick-break protection circuit and a KM1 and KM2 total stop indicating circuit.
6. The economical dual-power automatic switching control system according to claim 5, characterized in that: the first power supply monitoring loop is used for monitoring whether a first power supply has voltage or not, and when the SA change-over switch is switched to a5-6 contact, the SB2 is pressed to manually switch on the alternating current contactor KM1 of the first power supply; pressing SB1 to manually open the AC contactor KM1 of the first power supply;
the monitoring circuit of the second power supply is used for monitoring whether the second power supply has voltage or not, when the SA change-over switch is switched to a 7-8 contact, the AC contactor KM2 of the second power supply is manually switched on by pressing SB4, and the AC contactor KM2 of the second power supply is manually switched off by pressing SB 3;
when the first power supply is powered off and delayed for 0.2-0.5s by a time relay KT1 or KT2, the second power supply AC contactor KM2 is automatically switched on; when the load carried by the first power supply is overlarge, any one or three of the current transformer 1TAu, the current transformer 1TAv and the current transformer 1TAw connected in the loop of the first power supply act simultaneously to send a tripping command to the overcurrent relays 11KA, 12KA and 13KA so as to protect equipment;
when the first power supply works, the three-phase power supply loses power, and after 0.2-0.5s of time delay through a time relay KT1 or KT2, the second power supply AC contactor KM1 is automatically switched on; when the load of the power supply II is overlarge, any one or three of the current transformer 2TAu, the current transformer 2TAv and the current transformer 2TAw connected in the loop of the power supply II act simultaneously to send a tripping command to the overcurrent relays 21KA, 22KA and 23 KA.
7. The economical dual-power automatic switching control system according to claim 5, characterized in that: the dual-power-supply control loop consists of a normally-open contact of a relay K1, a live wire L13 of a first power supply, a live wire L23 of a second power supply, two circuit breakers QF3, a main stop switch JSB, an electrified indicator lamp HD and a zero line LN1 of the first power supply; the normally open contact of the relay K1 is connected between live wires L13 and L23 of a first power supply, the other end of the normally open contact of the relay K1 is connected with a circuit breaker QF3, the other end of the circuit breaker QF3 is connected with an electrified indicating lamp HD, the other end of the electrified indicating lamp HD is connected with a circuit breaker QF3, and the circuit breaker QF3 is connected with a zero line LN1 of the first power supply to form a dual-power-supply control loop.
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