CN112531882A - Automatic switching system of alternating current ring network power supply and operation monitoring method thereof - Google Patents
Automatic switching system of alternating current ring network power supply and operation monitoring method thereof Download PDFInfo
- Publication number
- CN112531882A CN112531882A CN202011485995.7A CN202011485995A CN112531882A CN 112531882 A CN112531882 A CN 112531882A CN 202011485995 A CN202011485995 A CN 202011485995A CN 112531882 A CN112531882 A CN 112531882A
- Authority
- CN
- China
- Prior art keywords
- power supply
- alternating current
- ring network
- fault
- network power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000005259 measurement Methods 0.000 claims description 9
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 230000005389 magnetism Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
-
- 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
-
- 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
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
-
- 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
- Y04S20/12—Energy storage units, uninterruptible power supply [UPS] systems or standby or emergency generators, e.g. in the last power distribution stages
-
- 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
-
- 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
- Y04S20/248—UPS systems or standby or emergency generators
Abstract
The invention belongs to the technical field of power systems, and particularly relates to an automatic switching system of an alternating current ring network power supply and an operation monitoring method thereof. Two alternating current contactors and two voltage intermediate relays are additionally arranged on two sides of an alternating current looped network circuit respectively; an auxiliary switch is additionally arranged on the looped network power supply air switch in the terminal box, and an alternating current contactor is additionally arranged on the load side of the looped network power supply air switch; two auxiliary switches are additionally arranged on the looped network power supply air switch respectively, an alternating current contactor is additionally arranged on each of two sides of the looped network power supply air switch, when any alternating current looped network power supply loses voltage, a standby power supply can be automatically switched in, a corresponding looped network power supply fault signal is sent out through the monitoring background, when a certain section of looped network fails, a fault section can be automatically cut off, the standby power supply on the other side is switched in, the power supply modes on two sides are achieved, normal looped network power supply is recovered, and the alternating current looped network fault signal is sent out through the monitoring background.
Description
Technical Field
The invention belongs to the technical field of power systems, and particularly relates to an automatic switching system of an alternating current ring network power supply and an operation monitoring method thereof.
Background
At present, low-voltage alternating-current ring network power supplies of transformer substations are manually controlled by alternating-current air switches, and one of the two power supplies runs and the other runs in a standby mode without signal monitoring and power supply standby switching functions. In operation, a certain air switch is tripped due to various reasons, and due to the fact that an alternating current looped network power supply monitoring signal and a power supply backup switching device are not available, the air switch can only be used when an operator visits or equipment sends an abnormal signal (such as switch pressing overtime and the like), otherwise, whether the looped network power supply is good or not can not be judged, the switch cannot be pressed normally, and a heater is powered off in winter.
After the low-voltage alternating-current ring network power supply is lost, the energy storage power supply of the circuit breaker is lost, the circuit breaker cannot normally store energy, and heating and moisture removing devices such as a mechanism and a terminal box cannot normally work. The circuit breaker can not normally store energy, if a signal loop is abnormal, when the pressure is reduced to a locking value, a locking signal can not be correctly sent, when a system fault occurs, the circuit breaker can not automatically coincide when the circuit breaker is reclosed and locked, and the circuit breaker refuses to override when the circuit breaker is separated and locked. The heating power supply is lost, the temperature is low in winter, the elasticity of a sealing rubber ring of a hydraulic mechanism of the circuit breaker is reduced, oil leakage, pressure relief and other phenomena occur, and when the circuit breaker acts, the sealing rubber ring is easy to damage; the terminal box and the mechanism box terminal strip are easily affected with damp due to the loss of the damp-removing power supply, the insulation is reduced, even the insulation breakdown is caused, so that the direct current grounding or short circuit is caused, and the switch misoperation is easily caused if the direct current two-point grounding occurs; the disconnecting switch loses the operating power supply, so that the disconnecting switch cannot be remotely or locally electrically operated; the loss of the isolating switch operating power supply in the electric operation process can cause the arc discharge time to be overlong, and can cause equipment damage and power grid accidents;
disclosure of Invention
Aiming at the problems, the invention provides an automatic switching system of an alternating current ring network power supply and an operation monitoring method thereof in order to solve the defects in the prior art.
The technical scheme of the invention is as follows:
an automatic switching system of an alternating current looped network power supply is characterized in that two sides of an alternating current looped network loop are respectively and additionally provided with two alternating current contactors C1 and C2 and two voltage intermediate relays ZJ1 and ZJ 2; an auxiliary switch is additionally arranged on the looped network power supply air switches K1 and K6 in the terminal box, and an alternating current contactor C2-1 and an alternating current contactor C5-2 are additionally arranged on the load sides of the looped network power supply air switches K1 and K6 respectively; two auxiliary switches are additionally arranged on ring network power supply air switches K2, K3, K4 and K5 respectively, and an alternating current contactor C1-2, C3-1, C2-2, C4-1, C3-2, C5-1, C4-2 and C6-1 are additionally arranged on two sides of the ring network power supply air switches K2, K3, K4 and K5 respectively, so that power monitoring of an alternating current ring network loop and functions of cutting off a fault section alternating current ring network and power backup switching are realized, and corresponding signals of 'alternating current ring network power supply I fault', 'alternating current ring network power supply II fault' and 'alternating current fault' are sent out at a monitoring background by switching on a measurement and control device through normally closed contacts of a voltage intermediate relay ZJ1 and a ZJ2 and normally open contacts of an alternating current contactor C1 and a C2;
when the alternating current ring network power supply loses voltage or a certain section of the ring network power supply is abnormal, the corresponding air switch on the power supply side trips to start the standby power supply switching device, the ring network on the fault section is automatically cut off, the standby power supply on the other side is switched on, meanwhile, a corresponding fault signal is sent out to remind monitoring personnel, and operation and maintenance personnel are informed to check and process in time.
Two voltage intermediate relays ZJ1 and ZJ2 for power supply monitoring, two AC contactors C1 and C2 for automatic switching of two ring network power supplies are additionally arranged in loops at two sides of an AC ring network, a fault occurs at a certain section of the ring network, an auxiliary switch is additionally arranged on ring network power supply air switches K1 and K6 in a standby power supply starting loop-terminal box, an AC contactor C2-1 and C5-2 are additionally arranged at load sides of ring network power supply air switches K1 and K6 respectively, two auxiliary switches are additionally arranged on switches K2, K3, K4 and K5 respectively, and an AC contactor C1-2, C3-1, C2-2, C4-1, C3-2, C5-1, C4-2 and C6-1 are additionally arranged at two sides of ring network power supply air switches K2, K3, K4 and K5 respectively, so that the fault-free ring network power supply can be recovered quickly;
when the voltage of the ring network power supply is lost due to failure, the voltage intermediate relays ZJ1 and ZJ2 are demagnetized, the normally closed contact is closed, the coil loop of the fault-free AC contactor C1 or C2 is connected, and the AC contactor is excited to be used as the standby ring network power supply.
When a certain section of the alternating current looped network is in fault, an air switch K1 or K2 or K3 or K4 or K5 or K6 on the looped network power supply side of the section trips, an auxiliary normally closed contact of the section trips, a coil loop C1-2 or C3-1 or C2-2 or C4-1 or C3-2 or C5-1 or C4-2 or C6-1 of a standby power supply side alternating current contactor of the fault section is switched on, an alternating current contactor of the section is excited, a main normally closed contact opens and cuts off the alternating current looped network of the fault section, a normally open auxiliary contact is switched on, a coil starting loop C1 or C2 of the standby power supply side alternating current contactor is switched on, and a standby power supply side alternating current contactor C1 or C2 of the fault-free looped network.
When any AC looped network power supply loses voltage, the voltage intermediate relays ZJ1 and ZJ2 with power supply monitoring lose magnetism, the normally closed contact is connected with the measurement and control device, and the monitoring background sends out a corresponding AC looped network power supply fault signal.
When a certain section of ring network has a fault, after the fault section of ring network is cut off, the standby ring network power supply AC contactor C1 or C2 is automatically switched on, the AC contactor C1 or C2 on two sides is opened for closing an auxiliary contact, a measurement and control device is switched on, and a monitoring background sends an AC ring network fault signal.
The main advantages of the invention are:
1. when any alternating current ring network power supply loses voltage, the standby power supply can be automatically switched on, and a fault signal of the corresponding ring network power supply is sent out through the monitoring background.
2. When a certain section of ring network has a fault, the fault section can be automatically cut off, a standby power supply at the other side is put into use, a power supply mode at two sides is realized, the power supply of a normal ring network is recovered, and an alternating current ring network fault signal is sent out through a monitoring background.
Drawings
Fig. 1 is a schematic diagram of a low-voltage ac ring network power supply monitoring backup power switching device according to the present invention.
Fig. 2 is a circuit diagram of monitoring and standby signal of the low-voltage ac looped network power supply of the present invention.
Detailed Description
The present invention is described in detail below by way of examples.
Example 1
Two sides of an alternating current looped network circuit are respectively provided with two alternating current contactors C1 and C2 and two voltage intermediate relays ZJ1 and ZJ 2; an auxiliary switch is additionally arranged on the looped network power supply air switches K1 and K6 in the terminal box, and an alternating current contactor C2-1 and an alternating current contactor C5-2 are additionally arranged on the load sides of the looped network power supply air switches K1 and K6 respectively; two auxiliary switches are additionally arranged on ring network power supply air switches K2, K3, K4 and K5 respectively, and an alternating current contactor C1-2, C3-1, C2-2, C4-1, C3-2, C5-1, C4-2 and C6-1 are additionally arranged on two sides of the ring network power supply air switches K2, K3, K4 and K5 respectively, so that power monitoring of an alternating current ring network loop and functions of cutting off a fault section alternating current ring network and power backup switching are realized, and corresponding signals of 'alternating current ring network power supply I fault', 'alternating current ring network power supply II fault' and 'alternating current fault' are sent out at a monitoring background by switching on a measurement and control device through normally closed contacts of a voltage intermediate relay ZJ1 and a ZJ2 and normally open contacts of an alternating current contactor C1 and a C2;
when the alternating current ring network power supply loses voltage or a certain section of the ring network power supply is abnormal, the corresponding air switch on the power supply side trips to start the standby power supply switching device, the ring network on the fault section is automatically cut off, the standby power supply on the other side is switched on, meanwhile, a corresponding fault signal is sent out to remind monitoring personnel, and operation and maintenance personnel are informed to check and process in time.
Two voltage intermediate relays ZJ1 and ZJ2 for power supply monitoring, two AC contactors C1 and C2 for automatic switching of two ring network power supplies are additionally arranged in loops at two sides of an AC ring network, a fault occurs at a certain section of the ring network, an auxiliary switch is additionally arranged on ring network power supply air switches K1 and K6 in a standby power supply starting loop-terminal box, an AC contactor C2-1 and C5-2 are additionally arranged at load sides of ring network power supply air switches K1 and K6 respectively, two auxiliary switches are additionally arranged on switches K2, K3, K4 and K5 respectively, and an AC contactor C1-2, C3-1, C2-2, C4-1, C3-2, C5-1, C4-2 and C6-1 are additionally arranged at two sides of ring network power supply air switches K2, K3, K4 and K5 respectively, so that the fault-free ring network power supply can be recovered quickly;
when the voltage of the ring network power supply is lost due to failure, the voltage intermediate relays ZJ1 and ZJ2 are demagnetized, the normally closed contact is closed, the coil loop of the fault-free AC contactor C1 or C2 is connected, and the AC contactor is excited to be used as the standby ring network power supply.
When a certain section of the alternating current looped network is in fault, an air switch K1 or K2 or K3 or K4 or K5 or K6 on the looped network power supply side of the section trips, an auxiliary normally closed contact of the section trips, a coil loop C1-2 or C3-1 or C2-2 or C4-1 or C3-2 or C5-1 or C4-2 or C6-1 of a standby power supply side alternating current contactor of the fault section is switched on, an alternating current contactor of the section is excited, a main normally closed contact opens and cuts off the alternating current looped network of the fault section, a normally open auxiliary contact is switched on, a coil starting loop C1 or C2 of the standby power supply side alternating current contactor is switched on, and a standby power supply side alternating current contactor C1 or C2 of the fault-free looped network.
When any AC looped network power supply loses voltage, the voltage intermediate relays ZJ1 and ZJ2 with power supply monitoring lose magnetism, the normally closed contact is connected with the measurement and control device, and the monitoring background sends out a corresponding AC looped network power supply fault signal.
When a certain section of ring network has a fault, after the fault section of ring network is cut off, the standby ring network power supply AC contactor C1 or C2 is automatically switched on, the AC contactor C1 or C2 on two sides is opened for closing an auxiliary contact, a measurement and control device is switched on, and a monitoring background sends an AC ring network fault signal.
The working principle is as follows:
one, AC power supply one supplies power, AC power supply two is spare
And an AC power supply air switch KK1 and a looped network power supply air switch K1 are switched on.
Alternating current power supply-B phase power supply-alternating current power supply air switch KK 1-voltage intermediate relay ZJ1 starting coil-alternating current power supply-C phase power supply (voltage intermediate relay ZJ1 excitation); the normally open contact of the voltage intermediate relay ZJ1 is closed, and the normally closed contact is opened;
the power supply comprises an alternating current power supply, a C-phase power supply, an alternating current power supply air switch KK1, a looped network power supply air switch K1 normally open contact, an alternating current contactor C1 coil, a voltage intermediate relay ZJ1 normally open contact (at the moment, the voltage intermediate relay ZJ1 is excited, the voltage intermediate relay ZJ1 normally open contact is closed), a voltage intermediate relay ZJ2 normally closed contact, and an alternating current power supply N (the alternating current contactor C1 is excited); the ac contactor C1 has a normally open contact closed and a normally closed contact open.
An alternating current power supply, namely a C-phase power supply, an alternating current power supply air switch KK1, an alternating current contactor C1 coil, a voltage intermediate relay ZJ1 normally-open contact, an alternating current contactor C1 normally-closed contact, and an alternating current power supply N (the alternating current contactor C1 realizes self-holding);
an alternating current power supply I-an alternating current power supply air switch KK 1-an alternating current contactor C1 normally open contact-an air switch K1-an air switch K2 (the air switches K2, K3, K4, K5 and K6 and the alternating current power supply air switch KK2 are sequentially closed);
after an air switch KK2 of the alternating current power supply is closed, a two-phase B power supply of the alternating current power supply is started by a coil of a voltage intermediate relay ZJ2, and a two-phase C power supply of the alternating current power supply is excited by a voltage intermediate relay ZJ 2; and a normally open contact of the voltage intermediate relay ZJ2 is closed, and the automatic switching of the alternating current power supply II is waited.
The second, AC power supply supplies power, the first AC power supply is spare
The principle of switching on the air switch KK2 of the alternating current power supply and the air switch K6 of the ring network power supply is the same as that of supplying power by the first alternating current power supply and supplying power by the second alternating current power supply, but the switching-on sequence of the air switch of the ring network power supply is opposite to that of supplying power by the first alternating current power supply and supplying power by the second alternating current power supply.
Second, ring network power supply K1, K2 short circuit fault between air switches (AC power supply one power supply, AC power supply two spare)
When short-circuit faults occur between ring network power supplies K1 and K2, the ring network power supply K1 air switch trips, an alternating current power supply I-an alternating current power supply air switch KK 1-an alternating current contactor C1 normally-open contact C phase-an ring network power supply air switch K1 normally-closed contact-an alternating current contactor C1-2 coil-an alternating current power supply N, an alternating current contactor C1-2 is excited, and the normally-open contact is closed; the self-holding type AC contactor comprises an AC power supply II, an AC power supply air on-off KK2, a looped network power supply air switch K6 normally open contact, an AC contactor C2 coil, a voltage intermediate relay ZJ2 normally open contact, an AC contactor C1-2 normally open contact, an AC power supply N, an AC contactor C2 normally open contact and an AC power supply two-way automatic switching, and an AC contactor C2 normally open auxiliary contact and an AC contactor C2 self-holding function.
The tripping principle of the air switch of the looped network power supply K2-K5 is the same as that of the air switch.
Three, ring network power K1, K2 short circuit fault between air switch (AC power supply two power supply, AC power supply one standby)
When short-circuit faults occur between ring network power supplies K1 and K2, the ring network power supply K2 air switch trips, an alternating current power supply II, an alternating current power supply air switch KK2, an alternating current contactor C2 normally-open contact C phase, a ring network power supply air switch K2 normally-closed contact, an alternating current contactor C2-1 coil, an alternating current power supply N and an alternating current contactor C2-1 are excited, and the normally-open contact is closed; the self-holding type AC contactor comprises an AC power supply I, an AC power supply air on-off KK1, a looped network power supply air switch K1 normally open contact, an AC contactor C1 coil, a voltage intermediate relay ZJ1 normally open contact, an AC contactor C2-1 normally open contact, an AC power supply N, an AC contactor C1 normally open contact and an AC power supply all the way, wherein the AC contactor C1 normally open auxiliary contact is closed, and the AC contactor C1 is self-held.
The tripping principle of the air switch of the looped network power supply K2-K5 is the same as that of the air switch.
Has the advantages that:
the low-voltage alternating-current ring network loop power supply monitoring and backup switching device is suitable for the technical conditions of the low-voltage alternating-current ring network of the existing transformer substation, and the improvement process is relatively simple.
The low-voltage alternating current looped network loop is additionally provided with the low-voltage alternating current looped network power supply monitoring and standby switching device, so that the cost is low and the expense is low.
The hidden danger is checked and the problem is found early, and the operation guarantee degree of the equipment is optimized.
The inspection amount is relatively reduced, and the management efficiency is enhanced.
The real-time monitoring of the low-voltage alternating-current looped network loop is realized, and the safe and reliable operation coefficient of the equipment and the working efficiency of personnel are improved.
Claims (3)
1. The utility model provides an exchange looped netowrk power automatic switching system which characterized in that:
two sides of an alternating current looped network circuit are respectively provided with two alternating current contactors C1 and C2 and two voltage intermediate relays ZJ1 and ZJ 2; an auxiliary switch is additionally arranged on the looped network power supply air switches K1 and K6 in the terminal box, and an alternating current contactor C2-1 and an alternating current contactor C5-2 are additionally arranged on the load sides of the looped network power supply air switches K1 and K6 respectively; two auxiliary switches are additionally arranged on ring network power supply air switches K2, K3, K4 and K5 respectively, and an alternating current contactor C1-2, C3-1, C2-2, C4-1, C3-2, C5-1, C4-2 and C6-1 are additionally arranged on two sides of the ring network power supply air switches K2, K3, K4 and K5 respectively, so that power monitoring of an alternating current ring network loop and functions of cutting off a fault section alternating current ring network and power backup switching are realized, and corresponding signals of 'alternating current ring network power supply I fault', 'alternating current ring network power supply II fault' and 'alternating current fault' are sent out at a monitoring background by switching on a measurement and control device through normally closed contacts of a voltage intermediate relay ZJ1 and a ZJ2 and normally open contacts of an alternating current contactor C1 and a C2;
when the alternating current ring network power supply loses voltage or a certain section of the ring network power supply is abnormal, the corresponding air switch on the power supply side trips to start the standby power supply switching device, the ring network on the fault section is automatically cut off, the standby power supply on the other side is switched on, meanwhile, a corresponding fault signal is sent out to remind monitoring personnel, and operation and maintenance personnel are informed to check and process in time.
2. The ac ring network power supply automatic switching system according to claim 1, characterized in that:
two voltage intermediate relays ZJ1 and ZJ2 for power supply monitoring, two AC contactors C1 and C2 for automatic switching of two ring network power supplies are additionally arranged in loops at two sides of an AC ring network, a fault occurs at a certain section of the ring network, an auxiliary switch is additionally arranged on ring network power supply air switches K1 and K6 in a standby power supply starting loop-terminal box, an AC contactor C2-1 and C5-2 are additionally arranged at load sides of ring network power supply air switches K1 and K6 respectively, two auxiliary switches are additionally arranged on switches K2, K3, K4 and K5 respectively, and an AC contactor C1-2, C3-1, C2-2, C4-1, C3-2, C5-1, C4-2 and C6-1 are additionally arranged at two sides of ring network power supply air switches K2, K3, K4 and K5 respectively, so that the fault-free ring network power supply can be recovered quickly;
when the voltage of the ring network power supply is lost due to failure, the voltage intermediate relays ZJ1 and ZJ2 are demagnetized, the normally closed contact is closed, the coil loop of the fault-free AC contactor C1 or C2 is connected, and the AC contactor is excited to be used as the standby ring network power supply.
When a certain section of the alternating current looped network is in fault, an air switch K1 or K2 or K3 or K4 or K5 or K6 on the looped network power supply side of the section trips, an auxiliary normally closed contact of the section trips, a coil loop C1-2 or C3-1 or C2-2 or C4-1 or C3-2 or C5-1 or C4-2 or C6-1 of a standby power supply side alternating current contactor of the fault section is switched on, an alternating current contactor of the section is excited, a main normally closed contact opens and cuts off the alternating current looped network of the fault section, a normally open auxiliary contact is switched on, a coil starting loop C1 or C2 of the standby power supply side alternating current contactor is switched on, and a standby power supply side alternating current contactor C1 or C2 of the fault-free looped network.
3. The operation monitoring method of the automatic switching system of the alternating current ring network power supply according to claim 1, characterized in that:
when any AC looped network power supply loses voltage, the voltage intermediate relays ZJ1 and ZJ2 with power supply monitoring lose magnetism, the normally closed contact is connected with the measurement and control device, and the monitoring background sends out a corresponding AC looped network power supply fault signal.
When a certain section of ring network has a fault, after the fault section of ring network is cut off, the standby ring network power supply AC contactor C1 or C2 is automatically switched on, the AC contactor C1 or C2 on two sides is opened for closing an auxiliary contact, a measurement and control device is switched on, and a monitoring background sends an AC ring network fault signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011485995.7A CN112531882A (en) | 2020-12-16 | 2020-12-16 | Automatic switching system of alternating current ring network power supply and operation monitoring method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011485995.7A CN112531882A (en) | 2020-12-16 | 2020-12-16 | Automatic switching system of alternating current ring network power supply and operation monitoring method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112531882A true CN112531882A (en) | 2021-03-19 |
Family
ID=75000678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011485995.7A Pending CN112531882A (en) | 2020-12-16 | 2020-12-16 | Automatic switching system of alternating current ring network power supply and operation monitoring method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112531882A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114217241A (en) * | 2021-11-22 | 2022-03-22 | 国网山西省电力公司晋中供电公司 | Method, system and device for detecting power leakage fault and storage medium |
-
2020
- 2020-12-16 CN CN202011485995.7A patent/CN112531882A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114217241A (en) * | 2021-11-22 | 2022-03-22 | 国网山西省电力公司晋中供电公司 | Method, system and device for detecting power leakage fault and storage medium |
| CN114217241B (en) * | 2021-11-22 | 2023-08-22 | 国网山西省电力公司晋中供电公司 | Method, system, device and storage medium for detecting power-on fault |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112531882A (en) | Automatic switching system of alternating current ring network power supply and operation monitoring method thereof | |
| CN114188971A (en) | Photovoltaic box-type substation | |
| CN214626487U (en) | Automatic switching system for alternating current ring network power supply | |
| CN112509850A (en) | Ground knife electric locking device and circuit interval with same | |
| CN202260420U (en) | Protection circuit for opening and closing coils | |
| CN109193583B (en) | Control circuit for self-adaptive switching of inner bridge connection short lead protection | |
| CN110021486B (en) | Automatic reclosing device for voltage-loss tripping | |
| CN218472836U (en) | Electric system of concentrated cooling station | |
| CN208241399U (en) | Intelligent high-low-voltage complete set of equipments with the alternative control system of self-powered DC control | |
| CN212409148U (en) | Safety protection circuit of mine cooling system | |
| CN211579581U (en) | Power-off protection system for motor of compressor of refrigerating unit | |
| CN112878413A (en) | Start-stop control system of electric hydraulic excavator | |
| CN115332014B (en) | Railway traction power supply circuit and transformer control device | |
| CN201298751Y (en) | Modified electricity no-voltage backup power switchover unit used in transformer station | |
| CN220440372U (en) | Control circuit capable of automatically breaking breaker after external power supply is powered off | |
| CN211701092U (en) | Fan power supply circuit | |
| CN215897139U (en) | Multifunctional power distribution control drawer | |
| TWI812416B (en) | An automatic sequence tripping and reclosing device | |
| CN214314569U (en) | High-voltage circuit breaker control device | |
| CN111536727B (en) | Safety protection circuit of mine cooling system and control method | |
| CN216721270U (en) | Photovoltaic box-type substation | |
| CN216751305U (en) | Control circuit of oil pump and control power supply of high-pressure cooling machine of data center | |
| TWI837814B (en) | An automatic reclosing improve device | |
| CN218102642U (en) | Locomotive emergency power supply partition device | |
| CN208189439U (en) | Automatic citrcuit bearker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |