CN103246303A - Control circuit of main transformer air-cooling system - Google Patents
Control circuit of main transformer air-cooling system Download PDFInfo
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- CN103246303A CN103246303A CN2013101237772A CN201310123777A CN103246303A CN 103246303 A CN103246303 A CN 103246303A CN 2013101237772 A CN2013101237772 A CN 2013101237772A CN 201310123777 A CN201310123777 A CN 201310123777A CN 103246303 A CN103246303 A CN 103246303A
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Abstract
The invention relates to a control circuit of a main transformer air-cooling system. The control circuit comprises a control switch, a fan start circuit is connected between a fan start node and an alternating-current power source, a fan control circuit is connected between a fan control node and the alternating-current power source, an automatic input control node is connected with an automatic start circuit which comprises a load-based start circuit and an oil-temperature-based start circuit, the automatic start circuit is connected with a direct-current power source, the control switch comprises three pairs of contacts, a pair of the contacts are connected onto the fan start circuit, the other two pairs of the contacts are respectively connected onto an input line and an output line between the automatic start circuit and the direct-current power source, the oil-temperature-based start circuit comprises a direct-current time relay, and the load-based current start circuit comprises a first direct-current intermediate relay. A direct-current control circuit stable in voltage is adopted, so that stability is improved; and the direct-current control circuit adopts direct-current devices, so that defects are easy to eliminate.
Description
Technical field
The present invention relates to a kind of control loop that is applicable to the air cooling system of the main-transformer in the electric system.
Background technology
Transformer is the very important electrical equipment of electric system, seriously influences in case the break down normal power supply that can give system and safe operation bring.The most of use of the main transformer of 110kV and following electric pressure is air-cooled, and the safe and stable operation of air cooling system is the important component part that guarantees power transformer normal output and power system safety and stability operation.
Current, air cooling system lacks relevant criterion, and device category is various, does not almost have standby redundancy, and the operational defect long-term existence disappears that it is very long to lack the cycle, and the normal operation of main transformer is had a negative impact.Ruuning situation from air cooling system, we find that the relay of these air cooling systems, contactor burn easily, air switch also usually damages, air cooling system can't the problem long-term existence that the air cooling system reliability is not high such as start according to the main transformer operating condition is reliable when adopting automatic Starting mode.
The control loop schematic diagram of example traditional air cooling system as shown in Figure 1, it adopts ac control system, and its method for designing is seen theoretically without any problem.It is analyzed as can be known:
When this air cooling system adopts the use manual mode, 3,4 contactings of control switch LK, contactor C, 1C action, fan electromotor starts.At this moment, contactor C, time relay 2SJ coil institute is with voltage is ac phase voltage.If main transformer high-pressure side load current is pressed the stating with load current ration greater than air cooling system, time relay 1SJ action, the 1SJ node that starts the loop is connected in time-delay, and the voltage on 1SJ, the ZJ coil is ac phase voltage.If main transformer oil temperature surpasses by the air-cooled temperature of oily temperature self-starting, the TJ2 closure, the ZJ action, the voltage on its coil is ac phase voltage.As seen, when this air cooling system was manually enabled, relay ZJ, the 1ZJ of control loop, 1SJ still can be because of the ruuning situation actions of transformer, and coil institute is with voltage to be ac phase voltage.
When air cooling system adopts the use automated manner, 3,4 contactings of control switch LK.If main transformer high-pressure side load current is pressed the stating with load current ration greater than air cooling system, time relay 1SJ action, the 1SJ node that starts the loop is connected in time-delay, the ZJ action, the voltage on 1SJ, the ZJ coil is ac phase voltage.The ZJ node is connected and is made contactor C, time relay 2SJ action, and fan electromotor starts, and sends out the main transformer fan simultaneously and drops into signal.If main transformer oil temperature surpasses by the air-cooled temperature of oily temperature self-starting, the TJ2 closure, the ZJ action starts air-cooled.As seen, when 1SJ burnt, air cooling system can't start by load current; C, when ZJ burns, air cooling system can't self-starting.Remote control starts when air-cooled, the closed self-sustaining of ZJ action node, simultaneously, contactor C action launching fan electromotor; When remote control stopped air cooling system, the 1ZJ action was returned ZJ, disconnects control loop.
From above analysis as can be known, no matter air cooling system adopts manual mode or automated manner, contactor 1C in the control loop, time relay 1SJ, intermediate relay ZJ, 1ZJ all can be according to main transformer operation conditions frequent movements, contactor C, time relay 2SJ are then charged for a long time when air cooling system moves, and this just makes reduce greatly the serviceable life of these A.C. contactors, AC relay.And not being the very stable ageing equipment that also makes, the ac panel power supply of transformer station do not speed up.
Summary of the invention
The purpose of this invention is to provide a kind of serviceable life of improving air cooling system, be convenient to the disappear control loop of scarce main transfer wind cooling system of air cooling system.
For achieving the above object, the technical solution used in the present invention is:
A kind of control loop of main transfer wind cooling system, be used for the main transfer wind cooling system that control comprises fan electromotor, the control loop of described main transfer wind cooling system comprise control switch, starting fan node, automatically drop into the control node, by load current start node, by oily startup temperature node, fan control node, be connected with the starting fan loop between described starting fan node and the AC power, be connected with the fan control loop between described fan control node and the AC power; Described starting fan loop comprises the contactor that is connected with described starting fan node; Described automatic input control node is connected with automatic startup loop, described automatic startup loop comprise be in parallel with described by load current start that node is connected by the stating with load loop with described by oily startup temperature node be connected by oily startup temperature loop, described automatic startup loop is connected with direct supply; Described control switch comprises the contact of three pairs of corresponding settings, a pair of described contact is connected on the described starting fan loop, and in addition the two pairs of described contacts are connected to and form described automatic input on input line between described automatic startup loop and the described direct supply and the output line and control node; Be connected and be parallel to the direct current time relay at a pair of described contact two ends described starting fan loop on by oily startup temperature node described comprising with described by oily startup temperature loop; Describedly start the loop by load current and comprise with described and be connected and be parallel to the first direct current auxiliary reclay at the two ends, a pair of described contact on the described starting fan loop by oily startup temperature node.
The control loop of described main transfer wind cooling system comprises that also remote control starts node, and described automatic startup loop comprises that also the remote control that is connected with described direct supply and described remote control startup node starts the loop; Described remote control starts the loop and comprises and described remote control startup node and the described second direct current auxiliary reclay that is connected by oily startup temperature loop.
Described starting fan is connected with first fuse on the loop.
Be respectively arranged with second fuse and the 3rd fuse on input line between described automatic startup loop and the described direct supply and the output line.
Therefore the control loop of above-mentioned main transfer wind cooling system has been considered the existence of prior art defective, considers and designs from the following aspects:
1, consider the AC system voltage instability, contained harmonic component and impact component are bigger than straight-flow system, and relay is professional inadequately aspect rectification and filtering, and operating condition is bad; Simultaneously, the straight-flow system of transformer station is carried out rectification by the rectifying installation of specialty, and dc voltage stability is conducive to the safe and stable operation of relay, the suitable DC control circuit that adopts of newly-designed air-cooled control loop.
2, consider that the air cooling system ac control circuit adopts contactor, exchange time relay, AC intermediate relay, these relays only are used for air cooling system, and standby redundancy is uneven, buy difficulty, usually buy Related product from producer again after defective occurring, having prolonged disappears lacks the time.And in recent years; because circuit, tranformer protection will progressively transform Microcomputer Protection as, stock's electromagnetic type, transistor-type relay also have a lot, and such DC relay is bought and is easier to; like product is also a lot, adopts this type of relay will be conducive to reducing the inventories and effectively shorten to disappear to lack the time.
3, from ruuning situation, the serviceable life of DC relay, obviously than the long service life that exchanges device, can reach 15 years even longer the working time of DC relay, should use DC relay as far as possible.
Based on above 3 considerations, the present invention compared with prior art has following advantage: the present invention adopts the stable DC control circuit of voltage, has improved the stability of its operation; And DC control circuit adopts direct current device, and not only operation life is longer, and it is scarce to be easier to disappear.
Description of drawings
Accompanying drawing 1 is the control loop schematic diagram of traditional air cooling system.
Accompanying drawing 2 is the control loop schematic diagram of main transfer wind cooling system of the present invention.
Embodiment
Be further described below in conjunction with the present invention of embodiment shown in the drawings.
Embodiment one: shown in accompanying drawing 2.A kind of control loop of main transfer wind cooling system is used for the main transfer wind cooling system that control comprises fan electromotor.The control loop of main transfer wind cooling system comprises control switch LK, starting fan node, input is controlled node, started node, starts node, fan control node by oily startup temperature node, remote control by load current automatically.Wherein control switch LK is air switch.
Be connected with the starting fan loop between starting fan node and the AC power, the starting fan loop comprises contactor C and the first fuse RD that is connected with the starting fan node.Be connected with the fan control loop between fan control node and the AC power.
Automatically drop into the control node and be connected with automatic startup loop, start automatically the loop comprise be in parallel with start by load current that node is connected by the stating with load loop, be connected by oily startup temperature node by oily startup temperature loop, the remote control startup loop that is connected with direct supply and remote control startup node.
The control loop of this main transfer wind cooling system adopts DC control system, that is: start the loop automatically and be connected with direct supply.Control switch LK comprises the contact (being respectively 1 and 2,3 and 4,5 and 6) of three pairs of corresponding settings, pair of contact 1 and 2 is connected on the starting fan loop, and in addition the two pairs of contacts 3 and 4,5 and 6 are connected to form on input line between automatic startup loop and the direct supply and the output line and drop into the control node automatically.Comprise and be connected by oily startup temperature node and be parallel to pair of contact 1 on the starting fan loop and the direct current time relay 1SJ at 2 two ends by oily startup temperature loop.Starting the loop by load current comprises and is connected by oily startup temperature node and is parallel to pair of contact 1 on the starting fan loop and the first direct current auxiliary reclay 1ZJ at 2 two ends.Remote control starts the loop and comprises the second direct current auxiliary reclay 2ZJ that starts node and be connected by oily startup temperature loop with remote control.Automatically be respectively arranged with the second fuse 1RD and the 3rd fuse 2RD on the input line between startup loop and the direct supply and the output line.
Just press the stating with load loop, start loop itself by oily startup temperature loop, remote control, its circuit structure and traditional circuit structure are similar, but owing to adopted DC control system in the control loop of this main transfer wind cooling system, need in above-mentioned each loop, to adopt DC relay.
When the control loop of this main transfer wind cooling system adopts manual mode, 1,2 contactings of control switch LK, contactor C action launching fan electromotor.At this moment, all disconnect 3,4 contacts and 5,6 contacts of control switch LK, and the operating condition of main transformer does not influence the control loop of this air cooling system, and each DC relay of control loop is not charged.
When the control loop of this main transfer wind cooling system adopts automated manner, 3,4 contacts of control switch LK and 5,6 contactings, when if main transformer high-pressure side load current is pressed the stating with load current ration greater than air cooling system, the 1SJ node in the closed starting fan of direct current time relay 1SJ action delay loop, make contactor C action, start fan electromotor.If temperature of oil in transformer surpasses air cooling system by prescribing a time limit on the oily startup temperature, WJ2 moves closed, and first direct current auxiliary reclay 1ZJ action makes contactor C action, starts fan electromotor.
When remote control started air cooling system, first direct current auxiliary reclay 1ZJ action made contactor C action launching fan electromotor; When remote control stopped air cooling system, second direct current auxiliary reclay 2ZJ action was returned the first direct current auxiliary reclay 1ZJ, disconnects control loop.
The control loop of above-mentioned main transfer wind cooling system is compared with the control loop of traditional air cooling system, has following difference:
1. aspect material, traditional air cooling system control scheme adopts four AC relay, two time relays (1SJ, 2SJ), two auxiliary reclays (ZJ, 1ZJ); Newly-designed air cooling system control scheme adopts three DC relay, i.e. direct current time relay 1SJ and two auxiliary reclays (being respectively the first direct current auxiliary reclay 1ZJ and the second direct current auxiliary reclay 2ZJ), and the utilization factor of relay is higher.
2. aspect design proposal basic, newly-designed air cooling system control scheme adopts DC control system, and voltage is more stable, and the operating condition of relay is better.Traditional air cooling system control scheme adopts ac control system, the alternating voltage instability, and the operating condition of relay is not good, causes relay to burn easily.
3. aspect control loop, when manually dropping into air cooling system, traditional air cooling system control scheme is deenergization not, and when the operating condition of transformer was not good, each relay of control loop still can be charged, burns easily; Newly-designed air cooling system control scheme does not then have such problem, and control switch LK will disconnect the control power supply, has effectively utilized the node of LK, has protected the relay of control loop.
4. aspect safeguarding, new control scheme adopts DC relay, moves more reliably, safeguards more convenient.
5. the contact of thermometer is the link that DC earthing possible take place in new departure loop, and is outdoor because the thermometer of transformer is installed in, and operating condition is not good, has the possibility that the dc system grounding accident takes place.By the investigation to the sealing situation of 110kV and following transforming plant main transformer thermometer, find its favorable sealing property.From logout, do not find to produce because of thermometer node defective insulation the problem of ground connection.Therefore, the insulation situation of thermometer possesses the condition of implementing new air cooling system design proposal.If in new design proposal, when dc system grounding appears in control loop, only need switch is got to manual position, just the DC control circuit of air cooling system and the straight-flow system of transformer station can be disconnected fully, do not influence the stable operation of transformer station direct current system; At this moment, because the loop is not charged, can detect the earth point of straight-flow system safely.Therefore, it is very convenient newly to design maintenance, the inspection work of air cooling system.
In sum, the control loop of newly-designed main transfer wind cooling system is raised the chief of straight-flow system, keeps away the shortage of AC system.Newly-designed air cooler control system adopts DC relay, has effectively utilized current circuit, the remaining stock's relay of main transformer protection microcomputerization, has saved maintenance cost, and effectively shortening disappears lacks the time.From the operation practice, new air cooler control system operation conditions is more stable, and reliability is higher, safeguards more convenient.Newly-designed air cooling system is more excellent than traditional design scheme.
Above-described embodiment only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalences that spirit essence is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (4)
1. the control loop of a main transfer wind cooling system, be used for the main transfer wind cooling system that control comprises fan electromotor, the control loop of described main transfer wind cooling system comprise control switch, starting fan node, automatically drop into the control node, by load current start node, by oily startup temperature node, fan control node, be connected with the starting fan loop between described starting fan node and the AC power, be connected with the fan control loop between described fan control node and the AC power; Described starting fan loop comprises the contactor that is connected with described starting fan node; Described automatic input control node is connected with automatic startup loop, described automatic startup loop comprise be in parallel with described by load current start that node is connected by the stating with load loop with described by oily startup temperature node be connected by oily startup temperature loop, it is characterized in that: described automatic startup loop is connected with direct supply; Described control switch comprises the contact of three pairs of corresponding settings, a pair of described contact is connected on the described starting fan loop, and in addition the two pairs of described contacts are connected to and form described automatic input on input line between described automatic startup loop and the described direct supply and the output line and control node; Be connected and be parallel to the direct current time relay at a pair of described contact two ends described starting fan loop on by oily startup temperature node described comprising with described by oily startup temperature loop; Describedly start the loop by load current and comprise with described and be connected and be parallel to the first direct current auxiliary reclay at the two ends, a pair of described contact on the described starting fan loop by oily startup temperature node.
2. the control loop of main transfer wind cooling system according to claim 1, it is characterized in that: the control loop of described main transfer wind cooling system comprises that also remote control starts node, and described automatic startup loop comprises that also the remote control that is connected with described direct supply and described remote control startup node starts the loop; Described remote control starts the loop and comprises and described remote control startup node and the described second direct current auxiliary reclay that is connected by oily startup temperature loop.
3. the control loop of main transfer wind cooling system according to claim 1 and 2, it is characterized in that: described starting fan is connected with first fuse on the loop.
4. the control loop of main transfer wind cooling system according to claim 1 and 2 is characterized in that: be respectively arranged with second fuse and the 3rd fuse on the input line between described automatic startup loop and the described direct supply and the output line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101237772A CN103246303A (en) | 2013-04-11 | 2013-04-11 | Control circuit of main transformer air-cooling system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101237772A CN103246303A (en) | 2013-04-11 | 2013-04-11 | Control circuit of main transformer air-cooling system |
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| CN103246303A true CN103246303A (en) | 2013-08-14 |
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| CN2013101237772A Pending CN103246303A (en) | 2013-04-11 | 2013-04-11 | Control circuit of main transformer air-cooling system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107317390A (en) * | 2017-08-21 | 2017-11-03 | 广州供电局有限公司 | Active air-cooled control system secondary circuit principle wiring standard is designed |
| CN108063491A (en) * | 2018-01-01 | 2018-05-22 | 国网宁夏电力有限公司吴忠供电公司 | Forced oil-circulated air-cooled transformer cooling control system |
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| CN2938530Y (en) * | 2006-08-15 | 2007-08-22 | 沈阳东电电力设备开发公司 | Air-cooled control cabinet of converting station |
| CN101908728A (en) * | 2010-07-05 | 2010-12-08 | 山东泰开变压器有限公司 | Air-cooled automatic remote control device of transformer |
| CN203164810U (en) * | 2013-04-11 | 2013-08-28 | 江苏省电力公司张家港市供电公司 | Control loop of air cooling system of main transformer |
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2013
- 2013-04-11 CN CN2013101237772A patent/CN103246303A/en active Pending
Patent Citations (4)
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| CN2854667Y (en) * | 2005-12-11 | 2007-01-03 | 吴彤旭 | Control device for cooling fan of transformer |
| CN2938530Y (en) * | 2006-08-15 | 2007-08-22 | 沈阳东电电力设备开发公司 | Air-cooled control cabinet of converting station |
| CN101908728A (en) * | 2010-07-05 | 2010-12-08 | 山东泰开变压器有限公司 | Air-cooled automatic remote control device of transformer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107317390A (en) * | 2017-08-21 | 2017-11-03 | 广州供电局有限公司 | Active air-cooled control system secondary circuit principle wiring standard is designed |
| CN107317390B (en) * | 2017-08-21 | 2024-03-26 | 广东电网有限责任公司广州供电局 | Main transformer air cooling control system secondary circuit principle wiring standard design |
| CN108063491A (en) * | 2018-01-01 | 2018-05-22 | 国网宁夏电力有限公司吴忠供电公司 | Forced oil-circulated air-cooled transformer cooling control system |
| CN108063491B (en) * | 2018-01-01 | 2024-01-23 | 国网宁夏电力有限公司吴忠供电公司 | Cooling control system of forced oil circulation air-cooled transformer |
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Application publication date: 20130814 |