CN202127172U - Transformer coil-out circuit of electric furnace - Google Patents
Transformer coil-out circuit of electric furnace Download PDFInfo
- Publication number
- CN202127172U CN202127172U CN2011201980649U CN201120198064U CN202127172U CN 202127172 U CN202127172 U CN 202127172U CN 2011201980649 U CN2011201980649 U CN 2011201980649U CN 201120198064 U CN201120198064 U CN 201120198064U CN 202127172 U CN202127172 U CN 202127172U
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- CN
- China
- Prior art keywords
- transformer
- inlet wire
- electric furnace
- breaker
- outgoing line
- 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.)
- Expired - Fee Related
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Abstract
The utility model relates to a transformer coil-out circuit of an electric furnace, which comprises a power supply inlet wire, an inlet wire disconnecting switch, a vacuum circuit breaker, a current transformer, a voltage transformer, an arrester, a resistance-capacitance absorber and a coil-out cable. The power supply inlet wire, the inlet wire disconnecting switch, the vacuum circuit breaker, the current transformer and the coil-out cable are sequentially connected. The voltage transformer is connected between the inlet wire disconnecting switch and the vacuum circuit breaker. The arrester and the resistance-capacitance absorber are respectively connected between the current transformer and the coil-out cable. The transformer coil-out circuit is simple and clear in wiring, flexible in operation mode, convenient to operate, capable of ensuring safety of operation equipment and the staff and flexible and reliable in opening and closing by using the disconnecting switch. In addition, electric appliance components of a major loop are arranged symmetrically and convenient to maintain and debug.
Description
Technical field
The utility model belongs to the furnace equipment field, especially a kind of change outgoing line circuit that is applied to electric furnace.
Background technology
Because China's electric furnace smelting is started late, small-sized electric furnace is in the majority, so the transformer capacity of protection electric furnace is also little, there is following problem in the switch cubicle of protection furnace transformer:
Before and after (1) 1900 year, smelt to become how the dress oil-minimum breakers are representative with SN10 series in the switch cubicle.Oil-minimum breaker once was used at home for a long time, was an important stage of switch cubicle development.Because scientific and technological progress, it can not adapt to the electric power development needs, withdraws from the market basically at present, is replaced by vacuum circuit-breaker.Oil-minimum breaker at first is interior dress transformer oil, and is inflammable and explosive, is not inconsistent environmental requirement, can not frequent operation, and the emergency stop valve trip several times must change oil and overhaul, and interruption duration will be grown, and maintenance load is big etc.
(2) last century the nineties so far, vacuum circuit-breaker has replaced oil-minimum breaker.The advantage front of vacuum circuit-breaker was stated, and volume is little, and is in light weight, and reliability is high, outside maintenance is simple, under normal circumstances, can frequently divide closing operation more than 10,000 times, and this is that oil-minimum breaker can't be compared.But oil-minimum breaker still uses the first generation and second generation product at present in a large number, and shortcoming is that vacuum interrupter directly contacts with air or directly exposes, and damaged by external force, is subject to moisture or contamination by dust, makes the flicker of arc control device outer surface or punctures; The operating mechanism specification is many, and different vacuum circuit breaker body is joined by different mechanisms, selects more complicated for use.
(3) switch cubicle still uses the relaying protection of conventional analogue formula, and electric component disperses, and the circuit complex connection can not satisfy safety, reliability service and centralized management requirement.
The utility model content
The purpose of the utility model is to overcome the shortcoming of above-mentioned prior art, provides a kind of electric furnace to become outgoing line circuit, and this circuit is not only simple in structure, working stability, and can guarantee electric furnace safety.
The purpose of the utility model solves through following technical scheme:
This kind electric furnace becomes outgoing line circuit, comprises electric power incoming line, inlet wire isolating switch, vacuum circuit-breaker, current transformer, voltage transformer, lightning arrester, rc absorber and outlet cable; Said electric power incoming line, inlet wire isolating switch, vacuum circuit-breaker, current transformer and outlet cable are connected successively; Said voltage transformer is connected between inlet wire isolating switch and the vacuum circuit-breaker; Said lightning arrester and rc absorber are connected between current transformer and the outlet cable.
Above-mentioned voltage mutual inductor serial has protective resistance.
Above-mentioned lightning arrester adopts zinc oxide arrester.
Above-mentioned rc absorber and lightning arrester are connected in parallel on the outlet side that electric furnace becomes outgoing line circuit simultaneously.
Above-mentioned outlet cable adopts power cable to be drawn out to electric furnace.
Further, on the outgoing cable of above-mentioned outlet cable, be provided with zero sequence current mutual inductor.
The utility model has following beneficial effect than prior art:
The circuit connection of the utility model is simple, and is clear, and operational mode is flexible, easy to operate, can guarantee operational outfit safety and personal security, and major loop electric elements symmetrical arrangement is convenient to safeguard debugging; Use isolating switch deciliter flexibility and reliability.
Description of drawings
Fig. 1 is the electrical block diagram of the utility model.
Wherein: 1, electric power incoming line; 2, inlet wire isolating switch; 3, vacuum circuit-breaker; 4, current transformer; 5, voltage transformer; 6, lightning arrester; 7, rc absorber; 8, outlet cable.
Embodiment
Below in conjunction with accompanying drawing the utility model is done and to be described in further detail: referring to Fig. 1,
The electric furnace of the utility model becomes outgoing line circuit, comprises electric power incoming line 1, inlet wire isolating switch 2, vacuum circuit-breaker 3, current transformer 4, voltage transformer 5, lightning arrester 6, rc absorber 7 and outlet cable 8.Electric power incoming line 1, inlet wire isolating switch 2, vacuum circuit-breaker 3, current transformer 4 and outlet cable 8 are connected successively; And the A of electric power incoming line 1, inlet wire isolating switch 2, vacuum circuit-breaker 3, current transformer 4 and outlet 8 mutually, B phase, C must connect by the order of left, center, right mutually, constitutes major loop.
Said lightning arrester 6 and rc absorber 7 are connected between current transformer 4 and the outlet cable 8.And necessary mutually summation current transformer 4 of the A phase of lightning arrester 6, rc absorber 7, B phase, C or the parallel connection of vacuum circuit-breaker 3 leading-out terminals; Because zinc oxide arrester 6, rc absorber 7 mainly are protection vacuum circuit-breakers 3, vacuum circuit-breaker 3 is to smelt to become the most crucial element of switch cubicle.
In order to protect voltage transformer 5, be in series with a protective resistance at the front end of voltage transformer 5.Said outlet cable 8 adopts power cables to be drawn out to electric furnace, on outgoing cable 8, uses zero sequence current mutual inductor, if when in the circuit earth fault taking place, cuts off the electricity supply with relaying protection.
For the electric power incoming line 1 of this furnace transformer outgoing line circuit, according to customer requirements or field condition, adopt busbar to connect, its ampacity is gone back other loads of considered and its parallel connection except that main load furnace transformer.
Rc absorber 7 at the utility model is connected in parallel on the outlet side that electric furnace becomes outgoing line circuit simultaneously with lightning arrester 6.Lightning arrester 6 becomes in the outgoing line circuit at electric furnace, adopts zinc oxide arrester to eliminate the primary heat transport system overvoltage that in deciliter process, produces owing to vacuum circuit-breaker, because have good non-linear voltage-current characteristic with zinc oxide; When normal working voltage; Resistance is very big, and the electric current that flows through is minimum, when overvoltage; Resistance sharply descends, and gets so that the overvoltage that produces is released.So zinc oxide arrester is gapless.
Below each critical piece of the present invention is elaborated:
Inlet wire isolating switch 2
Described inlet wire isolating switch 2 rated current should be greater than or not less than the ampacity of electric power incoming line lead.2 of inlet wire isolating switches could divide closing operation having under the uncharge situation of voltage, except that connecting major loop, after the major loop circuit breaker trips for some reason, rise and isolate a main circuit power and be beneficial to electric furnace is become the maintenance of outlet cabinet.
Circuit breaker 3
Said circuit breaker 3 can divide closing operation having under the load condition; Exist under accident or the overload situation at primary system, but through the relaying protection system automatic trip, the protection person and device security also have some other automatic protection functions, like the automatic reclosing protection of the protection of transformer weight, of short duration accident etc.In electric furnace becomes outgoing line circuit, adopt vacuum circuit-breaker more, because it is the vacuum circuit-breaker volume is little, in light weight, reliability is high, maintenance is simple.But when deciliter load, be prone to produce overvoltage.
Voltage transformer 5
Rc absorber 7
Rc absorber 7 is a kind of high-tech products of researching and developing in recent years, and it is connected in parallel in vacuum circuit-breaker outlet side with zinc oxide arrester simultaneously, and the overvoltage that vacuum circuit-breaker is produced can absorb and reduce too.That is to say that this is the second cover protection to vacuum circuit-breaker, because furnace transformer is a kind of visual plant, its fail safe, reliability service must have reliable electric wiring to guarantee.Experimental data proves that the overvoltage that vacuum circuit-breaker produces is a high frequency, and rc absorber also can reduce superpotential frequency; Capacitor in the rc absorber is different fully with ordinary capacitor, is called as capacitor for voltage protection, is characterized in that insulation level is high; System can normally move during temporary overvoltage; When the fluctuation of system working voltage is big (for example 2 times of normal voltages), also can keeps and can not glimmer during 124 hours or cross and wear, leave certain observation processing time to the operations staff; Capacitor is a dry type, forms with the flame retardant epoxy pouring, and fire resistance is good.Resistor in the rc absorber is metal net shaped, and heat dispersion might as well.
Claims (6)
1. an electric furnace becomes outgoing line circuit; It is characterized in that said furnace transformer outgoing line circuit comprises electric power incoming line (1), inlet wire isolating switch (2), vacuum circuit-breaker (3), current transformer (4), voltage transformer (5), lightning arrester (6), rc absorber (7) and outlet cable (8); Said electric power incoming line (1), inlet wire isolating switch (2), vacuum circuit-breaker (3), current transformer (4) and outlet cable (8) are connected successively; Said voltage transformer (5) is connected between inlet wire isolating switch (2) and the vacuum circuit-breaker (3); Said lightning arrester (6) and rc absorber (7) are connected between current transformer (4) and the outlet cable (8).
2. electric furnace according to claim 1 becomes outgoing line circuit, it is characterized in that said voltage transformer (5) is in series with protective resistance.
3. electric furnace according to claim 1 becomes outgoing line circuit, it is characterized in that, said lightning arrester (6) adopts zinc oxide arrester.
4. become outgoing line circuit according to claim 1 or 3 described electric furnaces, it is characterized in that said rc absorber (7) and lightning arrester (6) are connected in parallel on the outlet side that electric furnace becomes outgoing line circuit simultaneously.
5. electric furnace according to claim 1 becomes outgoing line circuit, it is characterized in that, said outlet cable (8) adopts power cable to be drawn out to electric furnace.
6. become outgoing line circuit according to claim 1 or 5 described electric furnaces, it is characterized in that, on the outgoing cable of said outlet cable (8), be provided with zero sequence current mutual inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201980649U CN202127172U (en) | 2011-06-13 | 2011-06-13 | Transformer coil-out circuit of electric furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201980649U CN202127172U (en) | 2011-06-13 | 2011-06-13 | Transformer coil-out circuit of electric furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202127172U true CN202127172U (en) | 2012-01-25 |
Family
ID=45490234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201980649U Expired - Fee Related CN202127172U (en) | 2011-06-13 | 2011-06-13 | Transformer coil-out circuit of electric furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202127172U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606889B (en) * | 2013-11-26 | 2016-01-20 | 四川西南不锈钢有限责任公司 | A kind of secondary side overcurrent protection circuit of electric arc furnace transformer |
| CN106444919A (en) * | 2016-11-10 | 2017-02-22 | 长春工业大学 | A carbonyl iron thermal decomposition furnace temperature control cabinet and a control method thereof |
| CN108987173A (en) * | 2018-10-17 | 2018-12-11 | 宁夏晟晏实业集团能源循环经济有限公司 | A kind of Anti-breakdown device for 35KV high-pressure vacuum switch |
| CN113012978A (en) * | 2021-03-01 | 2021-06-22 | 云南电网有限责任公司电力科学研究院 | Modular AC vacuum circuit breaker assembly |
-
2011
- 2011-06-13 CN CN2011201980649U patent/CN202127172U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606889B (en) * | 2013-11-26 | 2016-01-20 | 四川西南不锈钢有限责任公司 | A kind of secondary side overcurrent protection circuit of electric arc furnace transformer |
| CN106444919A (en) * | 2016-11-10 | 2017-02-22 | 长春工业大学 | A carbonyl iron thermal decomposition furnace temperature control cabinet and a control method thereof |
| CN108987173A (en) * | 2018-10-17 | 2018-12-11 | 宁夏晟晏实业集团能源循环经济有限公司 | A kind of Anti-breakdown device for 35KV high-pressure vacuum switch |
| CN113012978A (en) * | 2021-03-01 | 2021-06-22 | 云南电网有限责任公司电力科学研究院 | Modular AC vacuum circuit breaker assembly |
| CN113012978B (en) * | 2021-03-01 | 2023-05-23 | 云南电网有限责任公司电力科学研究院 | Modularized alternating current vacuum circuit breaker assembly |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120125 Termination date: 20120613 |