CN107317390B - Main transformer air cooling control system secondary circuit principle wiring standard design - Google Patents
Main transformer air cooling control system secondary circuit principle wiring standard design Download PDFInfo
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- CN107317390B CN107317390B CN201710720313.8A CN201710720313A CN107317390B CN 107317390 B CN107317390 B CN 107317390B CN 201710720313 A CN201710720313 A CN 201710720313A CN 107317390 B CN107317390 B CN 107317390B
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- 238000001816 cooling Methods 0.000 title claims abstract description 69
- 238000013461 design Methods 0.000 title description 8
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 34
- 238000006243 chemical reaction Methods 0.000 claims abstract description 32
- 238000012544 monitoring process Methods 0.000 claims description 65
- 230000001012 protector Effects 0.000 claims description 25
- 230000001934 delay Effects 0.000 claims description 4
- 230000007774 longterm Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 12
- 230000011664 signaling Effects 0.000 description 8
- 238000012546 transfer Methods 0.000 description 5
- 230000009977 dual effect Effects 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000000819 phase cycle Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- 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
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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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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
The invention relates to a secondary loop control device of a main transformer air cooling system and an air cooling control system, wherein the secondary loop control device of the main transformer air cooling system comprises a conversion unit connected with a current power supply and a standby power supply; the system also comprises a first on-off control unit, a first delay control unit, a second on-off control unit, a second delay control unit and a bidirectional control unit; the invention aims at improving the reliability of double-power switching when the coil is broken due to long-term electrification of the relay coil and optimizing and perfecting the alarm signal. Based on the invention, in practical application, two paths of power supplies can be realized, one path is selected as a main power supply through the change-over switch, and the other path is used as a standby power supply. Meanwhile, after the main power supply is switched to the standby power supply in a fault manner, the main power supply is not automatically returned (automatic switching is not repeated) under the condition that the fault of the main power supply is not checked and processed, so that the repeated switching of the fault power supply is avoided.
Description
Technical Field
The invention relates to the field of main transformer air cooling control, in particular to a secondary circuit principle wiring standard design of a main transformer air cooling control system.
Background
The capacity of the main transformer is generally large and high reliability of operation is required. Although the failure rate of the main transformer is not high, significant losses are incurred upon failure. The light weight may cause equipment failure, and the heavy weight may cause fire, endangering normal transportation safety. The traditional technology mainly utilizes an air cooling system to reduce the temperature of the main transformer in the working state.
At present, the main transformer air cooling control system does not make relevant standards, the air cooling systems of all manufacturers are large in difference, most of the main transformer air cooling systems mainly take the realization functions as main functions, the safety and reliability of the operation of the air cooling system are not considered enough, and great hidden danger is brought to the reliable and stable operation of the main transformer. Most of secondary circuits of the traditional air-cooling control box cannot realize the automatic switching function of the dual power supply, and when the main power supply loses power or the control circuit fails, the air-cooling control box circuit cannot be automatically switched to a standby power supply mode. The secondary circuit of the traditional air-cooled control box, which can realize the automatic switching function of the dual power supply, has insufficient switching reliability and has the phenomena of false signaling and missed signaling.
Disclosure of Invention
Based on the above, it is necessary to provide a standard design of secondary circuit principle wiring of a primary transformer air cooling control system aiming at the problem of insufficient reliability when the secondary circuit of the traditional air cooling control box switches power sources.
In order to achieve the above objective, in one aspect, an embodiment of the present invention provides a secondary circuit control device of a main transformer air cooling system, including a conversion unit connected to a current power supply and a standby power supply; the system also comprises a first on-off control unit, a first delay control unit, a second on-off control unit, a second delay control unit and a bidirectional control unit;
the input ends of the first on-off control unit and the first delay control unit are connected with a current power supply through a conversion unit, and the output ends of the first on-off control unit and the first delay control unit are grounded through a bidirectional control unit; the input ends of the second on-off control unit and the second delay control unit are connected with a standby power supply through a conversion unit, and the output ends of the second on-off control unit and the second delay control unit are grounded through a bidirectional control unit;
when the current power supply fails, the bidirectional control unit conducts the paths of the second switching-on and switching-off unit and the second delay control unit; the standby power supply supplies power to the second delay control unit through the change-over switch, so that the second delay control unit controls the bidirectional control unit to conduct the main variable air-cooled power supply loop of the standby power supply. In a specific embodiment, when the current power supply and the standby power supply are both converted into normal power supply from a fault state, the standby power supply supplies power to the second delay control unit through the conversion unit, so that the second delay control unit delays the power supply of the standby power supply to lag behind the power supply of the current power supply within a preset delay time period;
when the current power supply and the standby power supply are both converted into normal power supply from fault states, the first on-off control unit is powered through the conversion unit, so that the first on-off control unit controls the bidirectional control unit to conduct the main power conversion air-cooled power supply loop of the current power supply, and disconnect the main power conversion air-cooled power supply loop of the standby power supply.
In a specific embodiment, the power supply further comprises a first power supply protector and a second power supply protector;
the first power supply protector is connected between the conversion unit and the current power supply; the second power protector is connected between the conversion unit and the standby power supply.
In a specific embodiment, the switching unit is a switch.
In a specific embodiment, the transfer switch includes a first path, a second path, a third path, and a fourth path;
the first ends of the first passage and the second passage are connected with a current power supply through a first power supply protector, the second end of the first passage is connected with the input end of the first on-off control unit, and the second end of the second passage is connected with the input end of the first delay control unit;
the first ends of the third passage and the fourth passage are connected with a standby power supply through a second power supply protector, the second end of the third passage is connected with the input end of the second on-off control unit, and the second end of the fourth passage is connected with the input end of the second delay control unit.
In a specific embodiment, the first on-off control unit is a first power supply monitoring relay; the second on-off control unit is a second power supply monitoring relay;
the fixed contact of the first power supply monitoring relay is connected with the second end of the first passage, and the movable contact is connected with the bidirectional control unit; a first end of a coil of the first power supply monitoring relay is connected with a first end of the second path, and a second end of the coil of the first power supply monitoring relay is grounded;
the fixed contact of the second power supply monitoring relay is connected with the second end of the third passage, and the movable contact is connected with the bidirectional control unit; the first end of the coil of the second power supply monitoring relay is connected with the first end of the fourth path, and the second end is grounded.
In a specific embodiment, the bidirectional control unit comprises a first main power relay, a second main power relay;
the first end of the coil of the first main power supply relay is respectively connected with the movable contact of the first power supply monitoring relay and the first delay control unit, and the second end of the coil of the first main power supply relay is connected with the stationary contact of the second main power supply relay; the movable contact of the first main power supply relay is grounded;
the first end of the coil of the second main power supply relay is respectively connected with the movable contact of the second power supply monitoring relay and the second delay control unit, and the second end of the coil of the second main power supply relay is connected with the stationary contact of the first main power supply relay; the movable contact of the second main power relay is grounded.
In a specific embodiment, the first delay control unit is a first time relay; the second delay control unit is a second time relay;
the fixed contact of the first time relay is respectively connected with the second end of the second passage and the first end of the coil of the first time relay, and the movable contact is connected with the movable contact of the first power supply monitoring relay; the second end of the coil of the first time relay is connected with the second end of the coil of the first main power supply relay;
the fixed contact of the second time relay is respectively connected with the second end of the fourth passage and the first end of the coil of the second time relay, and the movable contact is connected with the movable contact of the second power supply monitoring relay; the second end of the coil of the second time relay is connected to the second end of the coil of the second main power relay.
In a specific embodiment, any one of the first on-off control unit, the second on-off control unit and the bidirectional control unit sends out a corresponding alarm signal for switching the power supply when the first on-off control unit, the second on-off control unit and the bidirectional control unit fail.
On the other hand, the embodiment of the invention also provides an air cooling control system,
the secondary loop control device of the main transformer air cooling system is included; the system also comprises a plurality of fan units;
the fan group is connected with the output end of the secondary circuit control device of the main variable air cooling system through a time relay.
The invention has the following advantages and beneficial effects:
the secondary circuit principle wiring standard design of the main transformer air-cooling control system can improve the reliability of double-power switching when the coil is broken due to long-term electrification of the relay coil and optimize and perfect alarm signals. Based on the invention, in practical application, the air-cooling control system can realize that two power supplies can select any one power supply as a main power supply and the other power supply as a standby power supply through the change-over switch. Meanwhile, after the main power supply is switched to the standby power supply in a fault manner, the main power supply is not automatically returned (automatic switching is not repeated) under the condition that the fault of the main power supply is not checked and processed, so that the repeated switching of the fault power supply is avoided.
Drawings
FIG. 1 is a block diagram of a secondary circuit control device of a main transformer air cooling system;
FIG. 2 is a schematic circuit diagram of a secondary circuit control device of the primary air-cooled system according to the present invention;
FIG. 3 is a block diagram of a protector mechanism of the secondary circuit control device of the primary air-cooled system of the present invention;
FIG. 4 is a schematic diagram of a signal loop of a secondary loop control device of a primary air-cooled system according to the present invention;
fig. 5 is a schematic diagram of a fan circuit of the air-cooled control system of the present invention.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to and integrated with the other element or intervening elements may also be present. The terms "mounted," "one end," "the other end," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The invention relates to a specific application scene of a secondary circuit principle wiring standard design of a main transformer air cooling control system, which comprises the following steps:
transformers are very important electrical devices in power systems, which upon failure can have serious consequences for the normal power supply and safe operation of the system. At present, most of main transformers use air cooling, and the safe operation of an air cooling system is an important component for ensuring the normal output of a power transformer and the safe and stable operation of a power system.
At present, an air cooling control system lacks relevant standards, has various equipment types, almost has spare parts for standby, has long running defects, has long defect eliminating period and has adverse effect on the normal running of a main transformer. From the operation condition of the air cooling control systems, the relays, contactors and air switches of the air cooling control systems are found to be easy to burn out, the air cooling control systems cannot be reliably started according to the operation conditions of the main transformer when an automatic starting mode is adopted, and the problem that the reliability of the air cooling control systems is low exists for a long time. And the secondary circuit of the traditional air-cooling control box mostly cannot realize the automatic switching function of the dual power supply, and when the main power supply is in power failure or the control circuit fails, the air-cooling control box circuit cannot be automatically switched to the standby power supply mode. The secondary circuit of the traditional air-cooled control box, which can realize the automatic switching function of the dual power supply, has insufficient switching reliability and has the phenomena of false signaling and missed signaling.
The secondary circuit principle wiring standard design of the main transformer air-cooling control system can improve the reliability of double-power switching when the coil is broken due to long-term electrification of the relay coil and optimize and perfect alarm signals. Based on the invention, in practical application, two paths of power supplies can be realized, one path is selected as a main power supply through the change-over switch, and the other path is used as a standby power supply. Meanwhile, after the main power supply is switched to the standby power supply in a fault manner, the main power supply is not automatically returned (automatic switching is not repeated) under the condition that the fault of the main power supply is not checked and processed, so that the repeated switching of the fault power supply is avoided.
In order to solve the problem of insufficient reliability when the secondary circuit of the traditional air cooling control box switches power sources, the invention provides a concrete embodiment 1 of a secondary circuit control device of a main transformer air cooling system, as shown in fig. 1, which is a structural block diagram of the secondary circuit control device of the main transformer air cooling system, as shown in fig. 1, the invention provides a secondary circuit control device of the main transformer air cooling system, which comprises a conversion unit 160 connected with a current power supply and a standby power supply; the system further comprises a first on-off control unit 110, a first delay control unit 120, a second on-off control unit 140, a second delay control unit 150 and a bidirectional control unit 130;
the input ends of the first on-off control unit 110 and the first delay control unit 120 are connected with the current power supply through a conversion unit, and the output ends are grounded through a bidirectional control unit 130; the input ends of the second switching control unit 140 and the second delay control unit 150 are connected with a standby power supply through a conversion unit 160, and the output ends are grounded through a bidirectional control unit 130;
the bidirectional control unit 130 conducts the paths of the second switching unit and the second delay control unit 150 when the current power supply fails; the standby power supply supplies power to the second delay control unit 150 through the change-over switch 160, so that the second delay control unit 150 controls the bidirectional control unit 130 to conduct the main variable air-cooled power supply loop of the standby power supply.
The first on-off control unit and the second on-off control unit respectively control the on-off of the conversion unit and the bidirectional control unit; the first delay control unit and the second delay control unit have a delay starting function; the bidirectional control unit can respectively control the on-off of a main variable air-cooled power supply loop of the current power supply and a main variable air-cooled power supply loop of the standby power supply; the conversion unit can change the primary and standby relation between the current power supply and the standby power supply, and the secondary circuit control device of the primary variable air cooling system is according to the primary and standby relation.
Specifically, fig. 2 is a schematic circuit diagram of a secondary circuit control device of a main variable air cooling system, as shown in fig. 2, a switching unit is a change-over switch SA1, a first on-off control unit is a power supply monitoring relay KA1, a first delay control unit is a time relay SJ1, a bidirectional control unit comprises a main power supply relay KM1 and a main power supply relay KM2, a second on-off control unit is a power supply monitoring relay KA2, the first delay control unit is the time relay SJ2, delay time set by the time relay SJ1 and the time relay SJ2 is 10S, a current power supply failure can comprise a broken line of a coil of the main power supply relay KM1, a broken line of the power supply monitoring relay KA1 or a current power supply failure per se, and a standby power supply failure can comprise a broken line of a coil of the main power supply relay KM2, a broken line of the power supply monitoring relay KA2 or a failure of the standby power supply per se.
When the current power supply is set as the main power supply and the backup power supply is set as the backup power supply, the changeover switch SA1 changes over to SA1:1-2 and SA1: the 5-6 nodes are conducted, SA1:3-4 and SA1: the 7-8 node is disconnected. When the coil of the main power supply relay KM1 is damaged due to long-term energization, the main power supply relay KM1:1-2, KM1:3-4 and KM1: the 5-6 nodes are disconnected, and the main power supply relay KM1: the 15-16 nodes are closed again because of the transfer switch SA1: the 5-6 node is conducted, the coil of the time relay SJ2 is electrified, and the time relay SJ2: the 15-18 nodes are delayed to be closed by 10S, then the coil of the main power supply relay KM2 is electrified, and the main power supply relay KM2:1-2, KM2:3-4 and KM2: and 5-6 nodes are closed, and a main power supply relay KM2: the 15-16 nodes are disconnected, and the main transformer air-cooled power supply loop of the standby power supply is connected.
After the current power supply is switched to the standby power supply, the main power supply is not automatically returned under the condition that the fault of the main power supply is not checked and processed, so that the repeated switching of the fault power supply is avoided.
In another embodiment, fig. 2 is a schematic circuit diagram of a secondary circuit control device of a main transformer air-cooling system according to the present invention, and when the current power supply is set as the main power supply and the standby power supply is set as the standby power supply, as shown in fig. 2, the switch SA1 is switched to SA1:1-2 and SA1: the 5-6 nodes are conducted, SA1:3-4 and SA1: the 7-8 node is disconnected. When the coil of the power supply monitor relay KA1 is damaged by long-term energization, the power supply monitor relay KA1: the 67-68 nodes are disconnected, the coil of the main power supply relay KM1 is powered off, and the main power supply relay KM1: the 15-16 nodes are closed because the switch SA1: the 5-6 node is conducted, the coil of the time relay SJ2 is electrified, and the time relay SJ2: the 15-18 nodes are delayed to be closed by 10S, then the coil of the main power supply relay KM2 is electrified, and the main power supply relay KM2:1-2, KM2:3-4 and KM2: and 5-6 nodes are closed, and a main power supply relay KM2: the 15-16 nodes are disconnected, and the main transformer air-cooled power supply loop of the standby power supply is connected.
The secondary circuit principle wiring standard design of the main transformer air-cooling control system can improve the reliability of double-power switching when the coil is broken due to long-term electrification of the relay coil and optimize and perfect alarm signals. Based on the invention, in practical application, two paths of power supplies can be realized, one path is selected as a main power supply through the change-over switch, and the other path is used as a standby power supply. Meanwhile, after the main power supply is switched to the standby power supply in a fault manner, the main power supply is not automatically returned (automatic switching is not repeated) under the condition that the fault of the main power supply is not checked and processed, so that the repeated switching of the fault power supply is avoided.
In a specific embodiment, when the current power supply and the standby power supply are both converted into normal power supply from a fault state, the standby power supply supplies power to the second delay control unit through the conversion unit, so that the second delay control unit delays the power supply of the standby power supply to lag behind the power supply of the current power supply within a preset delay time period;
when the current power supply and the standby power supply are both converted into normal power supply from fault states, the first on-off control unit is powered through the conversion unit, so that the first on-off control unit controls the bidirectional control unit to conduct the main power conversion air-cooled power supply loop of the current power supply, and disconnect the main power conversion air-cooled power supply loop of the standby power supply.
Specifically, fig. 2 is a schematic circuit diagram of the secondary circuit control device of the main variable air cooling system according to the present invention, and when the current power supply is set as the main power supply and the standby power supply is set as the standby power supply, as shown in fig. 2, the changeover switch SA1 is switched to SA1:1-2 and SA1: the 5-6 nodes are conducted, SA1:3-4 and SA1: the 7-8 node is disconnected. When the current power supply and the standby power supply are simultaneously changed from a fault state to normal power supply, the current power supply and the standby power supply are simultaneously changed from faults, and the main power supply relay KM1:15-16 nodes and main power supply relay KM2: the 15-16 nodes are in a closed state. Due to the change-over switch SA1:5-6 node conduction and main power supply relay KM1: the 15-16 nodes are closed, the coil of the time relay SJ2 is electrified, and the time relay SJ2: the 15-18 nodes are delayed to be closed by 10S, so that the standby power supply lags behind the current power supply to supply power, and the time relay SJ2: during the 15-18 node delay 10S closing period, the coil of the power supply monitoring relay KA1 is electrified, and the power supply monitoring relay KA1: the 67-68 nodes are closed, and the main power supply relay KM2:15-16 nodes are closed, a coil of the main power supply relay KM1 is electrified, and the main power supply relay KM1:1-2, KM2:3-4 and KM2: and 5-6 nodes are closed, and a main power supply relay KM1: the 15-16 nodes are disconnected, the main transformer air-cooled power supply loop of the current power supply is conducted, and the main transformer air-cooled power supply loop of the standby power supply is disconnected.
The double-power supply switching circuit automatically switches to the standby power supply to supply power when the main power supply is out of voltage and broken (phase-failure) or the main power supply relay coil in the main power supply circuit breaks to disconnect the main power supply, and simultaneously sends an alarm signal.
In a specific embodiment, fig. 3 is a block diagram of a protector mechanism of a secondary circuit control device of a main transformer air-cooling system according to the present invention, and as shown in fig. 3, the secondary circuit control device of the main transformer air-cooling system according to the present invention further includes a first power protector and a second power protector;
the first power supply protector is connected between the conversion unit and the current power supply; the second power protector is connected between the conversion unit and the standby power supply.
Specifically, as shown in fig. 2, the first power supply protector is a power supply protector KV1, and the second power supply protector is a power supply protector KV2. When the current power supply is disconnected or the phase sequence is reversed, the power supply protector KV1: the 15-18 nodes are disconnected; when the standby power supply is disconnected or the phase sequence is reversed, the power supply protector KV2: the 15-18 nodes are broken. When the power supply of the air cooling control system is switched to the fault-free standby power supply for supplying power, the nodes 67-68 of the power supply monitoring relay KA1 or the nodes 67-68 of the power supply monitoring relay KA2 send out alarm signals.
The power supply protector ensures the safety of the air cooling control system when the power supply fails. The alarm signal avoids the problems of damage to the fan motor or incapability of ventilation and heat dissipation due to the occurrence of problems of the power supply.
In a specific embodiment, the secondary circuit control device of the main transformer air cooling system is characterized in that the conversion unit is a conversion switch, and the conversion switch comprises a first passage, a second passage, a third passage and a fourth passage;
the first ends of the first passage and the second passage are connected with a current power supply through a first power supply protector, the second end of the first passage is connected with the input end of the first on-off control unit, and the second end of the second passage is connected with the input end of the first delay control unit;
the first ends of the third passage and the fourth passage are connected with a standby power supply through a second power supply protector, the second end of the third passage is connected with the input end of the second on-off control unit, and the second end of the fourth passage is connected with the input end of the second delay control unit.
As shown in fig. 2, the first path is a transfer switch SA1: node 1-2, second path is change-over switch SA1:3-4 nodes, and the third path is a transfer switch SA1:7-8 nodes, the first path is change-over switch SA1:5-6 nodes. The first end and the second end of the first passage are respectively SA1:1 and SA1:2, the first end and the second end of the second passage are respectively SA1:3 and SA1:4, the first end and the second end of the third passage are respectively SA1:7 and SA1:8, and the first end and the second end of the fourth passage are respectively SA1:5 and SA1:6.
Specifically, the changeover switch SA1:1-2 nodes and SA1: SA1 in 3-4 nodes: 1 and SA1:3 connect power protector KV1:15-18, SA1:2 are connected with KA1:67 of the nodes KA1:67-68 of the power supply monitoring relay, and SA1:3, connecting SJ1:15 of a time relay SJ1:15-18 node;
transfer switch SA1:7-8 nodes and SA1: SA1 in 5-6 node: 7 and SA1: and 5, connecting a power supply protector KV2:15-18, SA1:8 is connected with KA1:67 of a power monitoring relay KA2:67-68 node, and SA1: and 6, connecting SJ2 of 15-18 nodes of the time relay SJ2 to 15.
Based on the invention, in practical application, two paths of power supplies can be realized, one path is selected as a main power supply through the change-over switch, and the other path is used as a standby power supply. Meanwhile, after the main power supply is switched to the standby power supply in a fault manner, the main power supply is not automatically returned (automatic switching is not repeated) under the condition that the fault of the main power supply is not checked and processed, so that the repeated switching of the fault power supply is avoided.
In a specific embodiment, the secondary circuit control device of the main transformer air cooling system is characterized in that the first on-off control unit is a first power supply monitoring relay; the second on-off control unit is a second power supply monitoring relay;
the fixed contact of the first power supply monitoring relay is connected with the second end of the first passage, and the movable contact is connected with the bidirectional control unit; a first end of a coil of the first power supply monitoring relay is connected with a first end of the second path, and a second end of the coil of the first power supply monitoring relay is grounded;
the fixed contact of the second power supply monitoring relay is connected with the second end of the third passage, and the movable contact is connected with the bidirectional control unit; the first end of the coil of the second power supply monitoring relay is connected with the first end of the fourth path, and the second end is grounded.
As shown in fig. 2, the first power monitoring relay is a power monitoring relay KA1, the second power monitoring relay is a power monitoring relay KA2, and the stationary contact and the movable contact of the first power monitoring relay are KA1:67 and KA1:68, the stationary contact and the movable contact of the second power monitoring relay are KA2:67 and KA2:68.
Specifically, as shown in fig. 2, the power supply monitoring relay KA1: KA1 of 67-68 nodes: 67 connect switched SA1: SA1 of 1-2 node: 2, KA1:68 connect the A1 end of main power supply relay KM 1's coil, and the coil A1 end connection KV1 of power monitoring relay KA1: 15-18, wherein the A2 end is grounded;
power supply monitoring relay KA2: KA2 of 67-68 nodes: 67 connect switched SA1: SA1 of 7-8 nodes: 8, KA2:68 connect the A1 end of main power supply relay KM 2's coil, and the coil A1 end of power monitoring relay KA2 connects KV2:15-18, A2 is grounded.
Based on the invention, in practical application, two paths of power supplies can be realized, one path is selected as a main power supply through the change-over switch, and the other path is used as a standby power supply. Meanwhile, after the main power supply is switched to the standby power supply by failure, the main power supply is not automatically returned (automatic switching is not repeated) under the condition that the failure of the main power supply is not checked and processed, so that the situation that the failure power supply is switched again is avoided, and the switching is repeated
In a specific embodiment, the secondary loop control device of the main transformer air cooling system comprises a bidirectional control unit, a first power supply relay and a second power supply relay;
the first end of the coil of the first main power supply relay is respectively connected with the movable contact of the first power supply monitoring relay and the first delay control unit, and the second end of the coil of the first main power supply relay is connected with the stationary contact of the second main power supply relay; the movable contact of the first main power supply relay is grounded;
the first end of the coil of the second main power supply relay is respectively connected with the movable contact of the second power supply monitoring relay and the second delay control unit, and the second end of the coil of the second main power supply relay is connected with the stationary contact of the first main power supply relay; the movable contact of the second main power relay is grounded.
It should be noted that, as shown in fig. 2, the first main power supply relay is a main power supply relay KM1, the second main power supply relay is a main power supply relay KM1, and the stationary contact and the movable contact of the first main power supply relay are respectively the main power supply relay KM1:15 and KM1:16, the stationary contact and the movable contact of the second main power supply relay are respectively a main power supply relay KM1:15 and KM1:16.
specifically, the coil A1 end of the main power supply relay KM1 is respectively connected with KA1 of a power supply monitoring relay KA1:67-68 node: 68. time relay SJ1: SJ1 at 15-18 nodes: 18 The A2 end is connected with a main power supply relay KM2: KM2 for 15-16 nodes: 15, main power supply relay KM2: KM2 for 15-16 nodes: 16 is grounded;
the coil A1 end of the main power supply relay KM2 is respectively connected with KA2 of a power supply monitoring relay KA2:67-68 node: 68. time relay SJ2: SJ1 at 15-18 nodes: 18 The A2 end is connected with a main power supply relay KM1: KM1 for 15-16 nodes: 15, main power supply relay KM1: KM2 for 15-16 nodes: 16 to ground.
Based on the invention, in practical application, two paths of power supplies can be realized, one path is selected as a main power supply through the change-over switch, and the other path is used as a standby power supply. Meanwhile, after the main power supply is switched to the standby power supply in a fault manner, the main power supply is not automatically returned (automatic switching is not repeated) under the condition that the fault of the main power supply is not checked and processed, so that the repeated switching of the fault power supply is avoided.
In a specific embodiment, the secondary circuit control device of the main transformer air cooling system is characterized in that the first delay control unit is a first time relay; the second delay control unit is a second time relay;
the fixed contact of the first time relay is respectively connected with the second end of the second passage and the first end of the coil of the first time relay, and the movable contact is connected with the movable contact of the first power supply monitoring relay; the second end of the coil of the first time relay is connected with the second end of the coil of the first main power supply relay;
the fixed contact of the second time relay is respectively connected with the second end of the fourth passage and the first end of the coil of the second time relay, and the movable contact is connected with the movable contact of the second power supply monitoring relay; the second end of the coil of the second time relay is connected to the second end of the coil of the second main power relay.
It should be noted that, as shown in fig. 2, the first time relay is a time relay SJ1, the second time relay is a time relay SJ2, and the moving contact and the stationary contact of the first power supply monitoring relay are respectively a time relay SJ1:18 and SJ1:15, the movable contact and the stationary contact of the second power supply monitoring relay are respectively a time relay SJ1:18 and SJ1:15.
specifically, as shown in fig. 2, the time relay SJ1: SJ1 at 15-18 nodes: 15 are respectively connected with a change-over switch SA1: SA1 of 3-4 nodes: 4. the A1 end of the coil of the time relay SJ1, SJ1:18 connect power monitor relay KA1: KA1 of 67-68 nodes: 68, the A2 end of the coil of the time relay SJ1 is connected with a main power supply relay KM2: KM2 for 15-16 nodes: 15;
time relay SJ2: SJ2 at 15-18 nodes: 15 are respectively connected with a change-over switch SA1: SA1 of 5-6 nodes: 6. the A1 end of the coil of the time relay SJ2, SJ2:18 connect power monitor relay KA2: KA2 of 67-68 nodes: 68, the A2 end of the coil of the time relay SJ2 is connected with the main power supply relay KM1: KM1 for 15-16 nodes: 15.
based on the time relay in the circuit, when the main power supply is powered off and is switched to the standby power supply without delay, the fan motor coil generates higher reverse induction potential during power off, so that the starting current is overlarge, and the air switch of the power supply is tripped. Based on the time relay in the circuit, the time relay delays the conduction of the power supply circuit, so that the back-up power supply is put into after the reverse induction potential of the fan motor coil is attenuated, and the problem of tripping of the power supply air switch caused by overlarge starting current is avoided.
In a specific embodiment, the secondary circuit control device of the main transformer air cooling system,
when any one of the first on-off control unit, the second on-off control unit and the two-way control unit fails, a corresponding warning signal for switching the power supply is sent.
Specifically, fig. 4 is a schematic diagram of a signal loop of the secondary loop control device of the primary variable air cooling system, as shown in fig. 4, a constraint condition of signaling of an air cooling total stop signal is increased, contacts of two groups of fan starting relays KA3, KA4 and KA5 are increased, and the signal of air cooling total stop is ensured to be sent only when the fan is required to be started under an operation working condition and is not started.
The opening joint of the time relay SJ2 and the closing joint of the power supply monitoring relay KA1 are connected in parallel to form an alarm signal of 'current power supply', and the opening joint of the time relay SJ1 and the closing joint of the power supply monitoring relay KA2 are connected in parallel to form an alarm signal of 'standby power supply'.
Based on the monitoring relay of the two paths of power supplies in the loop, the monitoring relay is automatically switched to the standby power supply to supply power and simultaneously sends an alarm signal under the condition that the power supply is out of voltage or the coil of the relay is broken. Or under the condition that the coil of the main power supply monitoring relay is disconnected, the main power supply monitoring relay is automatically switched to the standby power supply to supply power, and meanwhile, an alarm signal is sent. When the two paths of power supplies are simultaneously powered off and then power is restored, the power supply according to the original set main power supply is ensured, and all alarm signals are automatically restored;
the method improves the signaling of the 'air cooling complete stop' signal, increases the constraint condition of signaling, ensures that the 'air cooling complete stop' alarm signal is sent only when the fan is started and not started under the operation condition, and does not send the signal when the transformer stops operating or is in light load operation, thereby reducing the interference of unnecessary signaling to operators.
In the embodiment 1 of the air cooling control system provided by the invention, fig. 5 is a schematic diagram of a fan circuit of the air cooling control system, as shown in fig. 5, the air cooling control system of the invention comprises a secondary circuit control device of a main transformer air cooling system; the system also comprises a plurality of fan units;
the fan group is connected with the output end of the secondary circuit control device of the main variable air cooling system through a time relay.
Specifically, the power output end of the main transformer air-cooled power supply switching device supplies power to all fan sets, all the fan sets are connected in parallel and connected between two ends of the power output end, and for staggered starting of all the fan sets, except for a preset first starting fan set, all the other fan sets are controlled by a time relay to delay starting.
The invention improves the reliability of double power supply switching, when the air cooling control system is automatically switched from the power supply of the main power supply to the power supply of the standby power supply, the first group of fans is started by 10S delay, the second group of fans is started by 10S delay, the condition that the power supply is free to switch and trip when the standby power supply is put into is avoided due to the existence of reverse induced potential generated when a fan motor is in power failure and the simultaneous starting of the two groups of fans, and the starting current is overlarge is generated, and the terminal flat cable distributes the installation unit according to the using function, and simultaneously, the circuit and the terminal flat cable are regulated according to the current technical specification requirements.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (5)
1. A secondary circuit control device of a main transformer air cooling system is characterized in that,
the power supply system comprises a conversion unit connected with a current power supply and a standby power supply; the system also comprises a first on-off control unit, a first delay control unit, a second on-off control unit, a second delay control unit and a bidirectional control unit;
the input ends of the first on-off control unit and the first delay control unit are connected with the current power supply through the conversion unit, and the output ends of the first on-off control unit and the first delay control unit are grounded through the bidirectional control unit; the input ends of the second on-off control unit and the second delay control unit are connected with the standby power supply through the conversion unit, and the output ends of the second on-off control unit and the second delay control unit are grounded through the bidirectional control unit;
when the current power supply fails, the bidirectional control unit conducts a passage between the bidirectional control unit and the second switching control unit and a passage between the bidirectional control unit and the second delay control unit; the standby power supply supplies power to the second delay control unit through the conversion unit, so that the second delay control unit controls the bidirectional control unit to conduct a main variable air-cooled power supply loop of the standby power supply;
when the current power supply and the standby power supply are both converted into normal power supply from fault states, the standby power supply supplies power to the second delay control unit through the conversion unit, so that the second delay control unit delays the power supply of the standby power supply to lag behind the power supply of the current power supply in a preset delay time period;
when the current power supply and the standby power supply are both converted into normal power supply from fault states, the first on-off control unit is powered through the conversion unit, so that the first on-off control unit controls the bidirectional control unit to conduct a main-change air-cooled power supply loop of the current power supply, and disconnect the main-change air-cooled power supply loop of the standby power supply;
the conversion unit is a conversion switch;
the change-over switch comprises a first passage, a second passage, a third passage and a fourth passage;
the first end of the first passage is connected with the current power supply through a first power supply protector, the second end of the first passage is connected with the input end of the first on-off control unit, and the second end of the second passage is connected with the input end of the first delay control unit;
the first ends of the third passage and the fourth passage are connected with the standby power supply through a second power supply protector, the second end of the third passage is connected with the input end of the second on-off control unit, and the second end of the fourth passage is connected with the input end of the second delay control unit;
and any one of the first on-off control unit, the second on-off control unit and the two-way control unit sends out a corresponding power supply switching alarm signal when the first on-off control unit, the second on-off control unit and the two-way control unit fail.
2. The secondary circuit control device of a main variable air cooling system according to claim 1, wherein the first on-off control unit is a first power supply monitoring relay; the second on-off control unit is a second power supply monitoring relay;
a fixed contact of the first power supply monitoring relay is connected with the second end of the first passage, and a movable contact of the first power supply monitoring relay is connected with the bidirectional control unit; a first end of a coil of the first power supply monitoring relay is connected with a first end of the second path, and a second end of the coil of the first power supply monitoring relay is grounded;
a fixed contact of the second power supply monitoring relay is connected with the second end of the third passage, and a movable contact is connected with the bidirectional control unit; the first end of the coil of the second power supply monitoring relay is connected with the first end of the fourth path, and the second end of the coil of the second power supply monitoring relay is grounded.
3. The primary air-cooled system secondary loop control device of claim 2, wherein the bi-directional control unit includes a first primary power relay, a second primary power relay;
a first end of a coil of the first main power supply relay is respectively connected with a movable contact of the first power supply monitoring relay and the first delay control unit, and a second end of the coil of the first main power supply relay is connected with a stationary contact of the second main power supply relay; the movable contact of the first main power supply relay is grounded;
the first end of the coil of the second main power supply relay is respectively connected with the movable contact of the second power supply monitoring relay and the second delay control unit, and the second end of the coil of the second main power supply relay is connected with the stationary contact of the first main power supply relay; and the movable contact of the second main power supply relay is grounded.
4. The secondary circuit control device of the main variable air cooling system according to claim 3, wherein the first delay control unit is a first time relay; the second delay control unit is a second time relay;
the fixed contact of the first time relay is respectively connected with the second end of the second path and the first end of the coil of the first time relay, and the movable contact is connected with the movable contact of the first power supply monitoring relay; the second end of the coil of the first time relay is connected with the second end of the coil of the first main power supply relay;
the fixed contact of the second time relay is respectively connected with the second end of the fourth passage and the first end of the coil of the second time relay, and the movable contact is connected with the movable contact of the second power supply monitoring relay; and the second end of the coil of the second time relay is connected with the second end of the coil of the second main power supply relay.
5. An air cooling control system, characterized by comprising the primary air cooling system secondary circuit control device according to any one of claims 1 to 4; the system also comprises a plurality of fan units;
the fan set is connected with the output end of the secondary circuit control device of the main transformer air cooling system through a time relay.
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Effective date of registration: 20200925 Address after: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Applicant after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Address before: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Applicant before: GUANGZHOU POWER SUPPLY Co.,Ltd. |
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