CN201838970U - Direct-current ice melter not provided with special rectifier transformer - Google Patents
Direct-current ice melter not provided with special rectifier transformer Download PDFInfo
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- CN201838970U CN201838970U CN2010201510210U CN201020151021U CN201838970U CN 201838970 U CN201838970 U CN 201838970U CN 2010201510210 U CN2010201510210 U CN 2010201510210U CN 201020151021 U CN201020151021 U CN 201020151021U CN 201838970 U CN201838970 U CN 201838970U
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Abstract
The utility model relates to a direct-current ice melter not provided with a special rectifier transformer, which comprises an alternating current side power supply circuit breaker QF, an isolation disconnecting link K, valve side current transformers Iva, Ivb and Ivc, a current converter, direct current side voltage transformers Udp and Udn, direct current side current transformers Idp and Idn, and direct current side disconnecting links S1-S4, wherein one ends of the valve side current transformers Iva, Ivb and Ivc are connected with a power supply by the isolation disconnecting link K and the alternating current side power supply circuit breaker QF, and the other ends are connected with the current converter; one side of the current converter is connected with the direct current side voltage transformer Udp and connected with one ends of the direct current side disconnecting links S1 and S2 by the direct current side current transformer Idp; the other end of the direct current side disconnecting link S1 is connected with an A-phase ice melting lead by a direct current ice melting bus; and the other ends of the direct current side disconnecting links S2 and S3 are connected with a B-phase ice melting lead by the direct current ice melting bus. The direct-current ice melter not provided with the special rectifier transformer has reasonable design, less investment and low cost and can ensure the requirement for safe and fast ice melting of circuits.
Description
Technical field
The utility model is a kind of not with the DC de-icing device of special rectifier transformer, belongs to the innovative technology that the power transmission network power line DC ice-melting is used.
Background technology
Electrical network is important foundation facility and the public utilities that concern national energy security and lifelines of the national economy, and bearing to socio-economic development and national economy provides the important energy guarantee, promotes the weighty responsibility of the sustainable development of socio-economy.Along with improving constantly of modernization level, the whole society is more and more higher to the degree of dependence of electric power, and the quality of supply of electric power has also been proposed requirements at the higher level.
The powerline ice-covering that low temperature sleet freezing weather causes is one of serious threat of being faced of system of numerous State Grid, and serious icing can cause the electrical network broken string, fall tower, causes large area blackout, also makes fast quick-recovery send the electricity very difficulty that becomes.Since the forties in 20th century, the threat of ice damage is the big technical barrier that the electric power system industrial quarters does one's utmost to tackle always.North America storm in 1998 has powered up guipure to U.S.A and has seriously influenced, and has caused the wide power breakdown of scope.2005, low temperature sleet freezing weather caused serious disaster once for China Central China, North China electrical network.The 1-2 month in 2008, low temperature sleet freezing weather attacks China south, Central China, East China once more, cause Guizhou, Hunan, Guangdong, Yunnan, Guangxi and Jiangxi etc. to economize transmission line large tracts of land, the long-time stoppage in transit, bring about great losses for national economy and people's lives.
In order to prevent the appearance once more of this situation, it is a kind of good method that transmission line is carried out ice-melt.With to exchange ice-melting method different, under certain environmental condition, the needed power supply capacity of DC ice melting need only to be decided by the D.C. resistance and the conductor length of DC ice-melting.With the operational mode of existing high voltage direct current transmission and power current inverter following two main difference points are arranged:
(1) owing to will be applicable to many line ice-meltings, DC de-icing device has a plurality of nominal operating conditions.
(2) it is considerably less that DC de-icing device runs on time of ice-melt operating mode every year, and year utilance is less than 5%.
After the ice storm disaster of North America in 1998, Hydro-Quebec and AREVA company have developed one cooperatively and have overlapped DC de-icing device, and this device is installed in the L é vis transformer station of Quebec, finish field adjustable in 2008.But up to the present, also be not used in the ice-melt of actual track.AREVA company scheme must configure dedicated be put transformer, alternating current filter, smoothing reactor and DC filter (trap), equipment and wiring complexity in order; It is simple not possess this programme wiring, very little to the harmonic effects of system, can dispose advantages such as bank of filters.
The utility model content
The purpose of this utility model is to consider the problems referred to above and provides a kind of reasonable in design, small investment, cost is low, guarantee to satisfy the quick ice-melt of each line security demand not with the DC de-icing device of special rectifier transformer.
The technical solution of the utility model is: the utility model is not with the DC de-icing device of special rectifier transformer, include AC side power supply circuit breaker Q F, isolation switch K, current on valve side instrument transformer Iva, Ivb and Ivc, converter, dc voltage instrument transformer Udp and Udn, DC side current transformer Idp and Idn, DC side disconnecting link S1, S2, S3 and S4, current on valve side instrument transformer Iva wherein, the end of Ivb and Ivc is connected with power supply by isolation switch K and AC side power supply circuit breaker Q F, current on valve side instrument transformer Iva, the other end of Ivb and Ivc is connected with converter, one side of converter is connected with dc voltage instrument transformer Udp to reach passes through DC side current transformer Idp and DC side disconnecting link S1, the end of S2 connects, the other end of DC side disconnecting link S1 is by DC ice melting bus and A ice-melt lead connection mutually, the opposite side of converter is connected with dc voltage instrument transformer Udn and by DC side current transformer Idn and DC side disconnecting link S3, the end of S4 connects, the other end of DC side disconnecting link S4 is by DC ice melting bus and C ice-melt lead connection mutually, DC side disconnecting link S2, the other end of S3 is by DC ice melting bus and B ice-melt lead connection mutually.
The measurement point of above-mentioned DC de-icing device is arranged and is comprised the measurement point of measuring interchange valve side three-phase voltage, three-phase current, DC side electric current, dc voltage.
The protection zone of above-mentioned DC de-icing device is divided into interchange protection zone, three parts in converter unit protection district and DC line protection district.
The protection of above-mentioned DC de-icing device is configured to AC overvoltage protection, interchange under-voltage protection, interchange overcurrent protection, valve short circuit protection, bridge differential protection, direct current overcurrent protection, ground connection overcurrent protection, the supervision of thyristor junction temperature, false triggering protection, DC over-voltage protection, direct current under-voltage protection, direct current 50Hz protection, direct current 100Hz protection, open circuit test protection and DC ice-melting impedance protection.
The utility model DC de-icing device is reasonable in design, small investment, and cost is low, guarantees that DC de-icing device satisfies the demand of the quick ice-melt of each line security, and reduces the investment of DC de-icing device.The utility model is that a kind of design is ingenious, and function admirable is invested lowly, and defencive function is complete, and is convenient and practical not with the DC de-icing device and the guard method thereof of special rectifier transformer.
Description of drawings
Fig. 1 the utility model proposes the DC de-icing device master who is not with special rectifier transformer to connect
Line and measurement point configuration schematic diagram thereof.
Fig. 2 is the schematic diagram of DC de-icing device ice-melting mode 1.
Fig. 3 is the schematic diagram of DC de-icing device ice-melting mode 2.
Embodiment
Embodiment:
The power supply of the utility model DC de-icing device can directly be taken from generator (or generator car), but more be to take from AC network, vehicular power generation car rated output voltage commonly used is 0.4kV, and the DC ice melting supply voltage that can be used as that AC network provides mainly comprises 35kV, 10kV, 6kV and 0.4kV.All types of lead ice-melt length by the decision of converter voltage on valve side are as shown in table 1, and are as shown in table 2 by all types of lead ice-melt length of DC de-icing device capacity decision.Effective ice-melt distance can satisfy the ice-melt demand of various Typical Route when 35kV and 10kV were directly as voltage on valve side as can be seen from Table 1, also can satisfy the ice-melt demand of various Typical Route from the typical transformer 35kV of table 2 and 10kV side capacity.Typical case's 500kV main transformer, 220kV main transformer and 110kV main transformer low-pressure side short circuit current also are the commutating reactance that typical 500kV main transformer, 220kV main transformer and 110kV main transformer all can provide converter commutation needs less than triode thyristor conducting state commonly used (non-repetition) electric current of surging.
For the DC de-icing device that inserts 220kV or 110kV main transformer 10kV side, the commutating reactance that 220kV main transformer or 110kV main transformer can provide converter to need, converter directly is connected on 220kV main transformer or 110kV main transformer 10kV side, this not as shown in Figure 1 with the main electrical scheme of special rectifier transformer, adopt 6 pulsation rectifications, and DC side is not established earth point.This DC de-icing device can move between each transformer station comparatively easily owing to there is not rectifier transformer.Idle and the harmonic wave that DC de-icing device when operation produces can compensate and suppresses by dispose corresponding bank of filters in the 10kV side.Consider the short-time characteristic of ice-melt, under certain condition,, then also can not dispose bank of filters and carry out reactive power compensation and harmonic wave inhibition if a 220kV main transformer or 110kV main transformer 10kV side can be soared with the input power supply as converter.Filter can determine whether dispose as the case may be, if dispose then DC de-icing device not can be exchanged into static passive compensation device (SVC) operation as the ice-melt time spent.
The main effect of smoothing reactor is to prevent discontinuous current, restriction current pulsation and short circuit current in the commutating circuit.As previously mentioned, the 220kV main transformer can limiting short-circuit current.The 220kV line reactance is bigger more than 4 times than D.C. resistance, time constant T=L/R＞4/314=12.7ms, the pulsation period Ts=20/6=3.3ms of 6 pulsation full-wave bridge rectifiers, the time constant in ice-melt loop is greater than the current pulsation cycle, electric current can be not interrupted, so do not need to be provided with special smoothing reactor.In like manner, commutating reactance and limiting short-circuit current that the 220kV main transformer can provide converter to need be not so need to be provided with specially commutating reactance.
Only adopt ice-melt mode shown in Figure 2 when the utility model proposes the DC de-icing device operation of not being with special rectifier transformer, do not adopt ice-melt mode shown in Figure 3.
The utility model is not with the DC de-icing device of special rectifier transformer as shown in Figure 1, include AC side power supply circuit breaker Q F, isolation switch K, current on valve side instrument transformer Iva, Ivb and Ivc, converter, dc voltage instrument transformer Udp and Udn, DC side current transformer Idp and Idn, DC side disconnecting link S1, S2, S3 and S4, current on valve side instrument transformer Iva wherein, the end of Ivb and Ivc is connected with power supply by isolation switch K and AC side power supply circuit breaker Q F, current on valve side instrument transformer Iva, the other end of Ivb and Ivc is connected with converter, one side of converter is connected with dc voltage instrument transformer Udp to reach passes through DC side current transformer Idp and DC side disconnecting link S1, the end of S2 connects, the other end of DC side disconnecting link S1 is by DC ice melting bus and A ice-melt lead connection mutually, the opposite side of converter is connected with dc voltage instrument transformer Udn and by DC side current transformer Idn and DC side disconnecting link S3, the end of S4 connects, the other end of DC side disconnecting link S4 is by DC ice melting bus and C ice-melt lead connection mutually, DC side disconnecting link S2, the other end of S3 is by DC ice melting bus and B ice-melt lead connection mutually.
The utility model is not arranged with the DC de-icing device measurement point of special rectifier transformer and is comprised the measurement point of measuring interchange valve side three-phase voltage, three-phase current, DC side electric current, dc voltage.The protection zone is divided into interchange protection zone, three parts in converter unit protection district and DC line protection district; the defencive function configuration is as shown in table 3; totally 14 kinds of protections; wherein the 1-13 principle of adjusting can be determined with reference to the corresponding protection of high voltage direct current transmission; the differential protection of DC ice-melting direct voltage is the protection that the utility model proposes first; protection range and purpose are when ice-melt, check whether DC side both positive and negative polarity direct voltage equates, judges whether occur earth fault on the circuit with this.The principle of adjusting is: if when DC side both positive and negative polarity direct voltage exceeds certain definite value, then judge and break down.With the DC line protection method of the DC de-icing device of special rectifier transformer, it is not the differential protection of DC ice-melting direct voltage to the utility model, when ice-melt, detects institute and melts alternating current circuit both positive and negative polarity voltage sum and whether surpass set point, and protection divides two sections:
1)|Udp+Udn|＞ΔUset1
2)|Udp+Udn|＞ΔUset2
In the formula: Udp DC side cathode voltage, Udn DC side negative electricity, Δ Uset1 are I section (section of reporting to the police) definite value, and Δ Uset2 is II section (tripping operation section) definite value.
With the DC line protection method of the DC de-icing device of special rectifier transformer, its protection sequence of movement is not as follows for the utility model:
1) satisfying | the I section is reported to the police during Udp+Udn|＞Δ Uset1 formula;
2) satisfy | II section action phase shift locking during Udp+Udn|＞Δ Uset2 formula, jump AC circuit breaker, the locking AC circuit breaker.
Above-mentioned Δ Uset1 gets 0.05-0.1pu, and 1000ms-5000ms is got in time-delay; Δ Uset2 gets 0.15-0.3pu, and 100ms-300ms is got in time-delay.
Ice melting current (surpassing 3000A) and capacity (surpassing 50MW) that typical case 500kV circuit needs are bigger, ac-side current also surpasses 2500A, in view of the importance of 500kV main transformer,, recommend to adopt the band special rectifier transformer to insert to obtain the DC de-icing device of power supply from 500kV main transformer 35kV side.Therefore, be not with rectification to become DC de-icing device and should not be connected on 500kV main transformer 35kV side, only be adapted at connecing 220kV or 110kV main transformer 10kV side.
The characteristics of this DC de-icing device main electrical scheme are:
1) do not need special rectifier transformer, directly be connected on 220kV main transformer or 110kV main transformer 10kV side.
2) do not need to be provided with specially commutating reactance.
3) do not need to be provided with specially smoothing reactor.
4) do not need configuring direct current filter (trap).
5) DC side is not provided with earth point.
6) do not adopt the 1-2 mode to carry out ice-melt.
7) can be used for most of 220kV and 110kV line ice-melting, require converter to have the big electric current serviceability of long-term wide-angle.
8) can dispose alternating current filter as required, if dispose then DC de-icing device not can be exchanged into static passive compensation device (SVC) operation as the ice-melt time spent, the capacity of filter is determined according to DC de-icing device operating mode and the comprehensive back of reactive power compensation needs.
9) can conveniently between each transformer station, move.
Table 1 is by the DC ice-melting length of voltage on valve side decision
1. minimum ice melting current calculates according to test both at home and abroad, empirical equation, and design conditions are: temperature-5 ℃, wind speed 5
Annotate:
Meter per second, ice covering thickness 10mm;
2. 20 ℃ of values are got in too conservative calculating, power line DC resistance.
Table 2 is by the DC ice-melting length of DC de-icing device capacity decision
1. minimum ice melting current calculates according to test both at home and abroad, empirical equation, and condition is: temperature-5 ℃, wind speed
Annotate:
5 meter per seconds, ice covering thickness 10mm;
2. 20 ℃ of values are got in too conservative calculating, power line DC resistance.
The protection configuration of table 3 DC de-icing device
| Sequence number | The protection title | Affiliated area |
| 1? | The AC overvoltage protection | Exchange the |
| 2? | Exchange under-voltage protection | Exchange the |
| 3? | Exchange overcurrent protection | Exchange the |
| 4? | Valve short circuit protection | The converter unit protection district |
| 5? | The bridge differential protection | The converter unit protection district |
| 6? | The direct current overcurrent protection | The converter unit protection district |
| 7? | The thyristor junction temperature monitors | The converter unit protection district |
| 8? | The false triggering protection | The converter unit protection district |
| 9? | DC over-voltage protection | The DC ice-melting protection zone |
| 10? | The direct current under-voltage protection | The DC ice-melting protection zone |
| 11? | Direct current 50Hz protection | The DC ice-melting protection zone |
| 12? | Direct current 100Hz protection | The DC ice-melting protection zone |
| 13? | The open circuit test protection | The DC ice-melting protection zone |
| 14? | The differential protection of DC ice-melting direct voltage | The DC ice-melting protection zone |
Guizhou electrical network Fuquan transformer station in 1-2 month ice damage in 2008 most of 220kV outlet all owing to icing seriously damages.In this transformer station one cover 25MW DC de-icing device was installed in 2008 DC ice melting has been carried out in all 220kV outlets.From table 4 (220kV of Fuquan transformer station outlet 1-1 ice-melt mode major parameter) as can be seen this DC de-icing device can satisfy the demand of all 220kV outlet ice-melts of Fuquan transformer station.Its main wiring diagram and measuring point dispose as shown in Figure 1, and important technological parameters is as shown in table 5, and the defencive function of configuration is as shown in table 4.
In addition, the direct current that the utility model proposes also is not applied in Guizhou with the DC de-icing device main electrical scheme of special rectifier transformer and measurement point collocation method thereof and builds a transformer station surplus east, Guangxi Nan Tang, the logical Ji in Guangdong etc. 10.
In January, 2009, sleety weather appears in middle part, Guizhou Province, east, northern territory, some circuit icing, and thickness reaches 5～10mm.12 days historical record of Duyun City " complete black " is created in one of worst-hit areas during the ice damage at the beginning of all sparing the area and be 2008.January 7,8 days to this regional 110kV good fortune ox line, old line of 220kV good fortune.Icing on these 3 circuits is glaze, is solid ice cube shape, and thickness reaches 4mm, 5mm and 8mm respectively.Six dish water areas are higher areas of height above sea level in the Guizhou Province, and all have the circuit icing every year, adopts the mode of artificial deicing more.January 9 was carried out ice-melt to this regional 110kV water tree plum line.The circuit icing was the snow rime at that time, and thickness has reached 100mm, and span middle part lead sag is bigger.Switch on after 10 minutes, the lead that passes to electric current begins snowy rime and comes off, and lead pops up very soon subsequently, and the icing on the lead all comes off at once.
7-10 day in January, 2009, being subjected to influences than strong cold air, cooling weather appears continuing on a large scale in the whole nation, obvious icing phenomenon appears in the high height above sea level track section of level ground, Shaoguan stone area portion, Guangdong Power Grid powerline ice-covering on-line monitoring and early warning system show that circuit maximum icing in part monitoring point, Shaoguan reaches 3-7mm, and artificial observation 110kV leads to plum line (high height above sea level Da Mei line segment) the about 8mm of maximum icing.The logical plum line of the decision emergency start 110kV on 10 morning of January of Shaoguan power supply administration (the logical Ji of 220kV station-110kV bridge station-110kV plum blossom station) DC ice melting program, provide DC ice melting current by the logical Ji of the 220kV stream deicing device of standing erectly to circuit, along with growing steadily of DC de-icing device output current, 110kV logical plum line conductor temperature in Shaoguan, Guangdong begins progressively to rise, when rising to 8 ℃ to 10 ℃ to conductor temperature, the icing on the total length 66km kilometer circuit drops one after another.
The table 4 Fuquan 220kV of transformer station outlet 1-1 ice-melting mode major parameter calculates
1. minimum ice melting current calculates according to test both at home and abroad, empirical equation, and design conditions are: temperature-5 ℃,
Annotate:
Wind speed 5 meter per seconds, ice covering thickness 10mm;
2. 20 ℃ of values are got in too conservative calculating, power line DC resistance.
Table 5 Fuquan transformer station is not with special rectifier to become the DC de-icing device important technological parameters
Claims (4)
1. one kind with the DC de-icing device of special rectifier transformer, it is characterized in that including AC side power supply circuit breaker Q F, isolation switch K, current on valve side instrument transformer Iva, Ivb and Ivc, converter, dc voltage instrument transformer Udp and Udn, DC side current transformer Idp and Idn, DC side disconnecting link S1, S2, S3 and S4, current on valve side instrument transformer Iva wherein, the end of Ivb and Ivc is connected with power supply by isolation switch K and AC side power supply circuit breaker Q F, current on valve side instrument transformer Iva, the other end of Ivb and Ivc is connected with converter, one side of converter is connected with dc voltage instrument transformer Udp to reach passes through DC side current transformer Idp and DC side disconnecting link S1, the end of S2 connects, the other end of DC side disconnecting link S1 is by DC ice melting bus and A ice-melt lead connection mutually, the opposite side of converter is connected with dc voltage instrument transformer Udn and by DC side current transformer Idn and DC side disconnecting link S3, the end of S4 connects, the other end of DC side disconnecting link S4 is by DC ice melting bus and C ice-melt lead connection mutually, DC side disconnecting link S2, the other end of S3 is by DC ice melting bus and B ice-melt lead connection mutually.
2. according to claim 1 not with the DC de-icing device of special rectifier transformer, it is characterized in that the measurement point of above-mentioned DC de-icing device is arranged the measurement point that comprises measurement interchange valve side three-phase voltage, three-phase current, DC side electric current, dc voltage.
3. according to claim 1 not with the DC de-icing device of special rectifier transformer, it is characterized in that the protection zone of above-mentioned DC de-icing device is divided into interchange protection zone, three parts in converter unit protection district and DC line protection district.
4. according to claim 1 not with the DC de-icing device of special rectifier transformer, it is characterized in that the protection of above-mentioned DC de-icing device is configured to AC overvoltage protection, interchange under-voltage protection, interchange overcurrent protection, valve short circuit protection, bridge differential protection, direct current overcurrent protection, ground connection overcurrent protection, the supervision of thyristor junction temperature, false triggering protection, DC over-voltage protection, direct current under-voltage protection, direct current 50Hz protection, direct current 100Hz protection, open circuit test protection and DC ice-melting impedance protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201510210U CN201838970U (en) | 2010-03-30 | 2010-03-30 | Direct-current ice melter not provided with special rectifier transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201510210U CN201838970U (en) | 2010-03-30 | 2010-03-30 | Direct-current ice melter not provided with special rectifier transformer |
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| CN201838970U true CN201838970U (en) | 2011-05-18 |
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|---|---|---|---|
| CN2010201510210U Expired - Lifetime CN201838970U (en) | 2010-03-30 | 2010-03-30 | Direct-current ice melter not provided with special rectifier transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101882774A (en) * | 2010-03-30 | 2010-11-10 | 南方电网技术研究中心 | DC de-icing device without special rectifier transformer and protection method thereof |
-
2010
- 2010-03-30 CN CN2010201510210U patent/CN201838970U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101882774A (en) * | 2010-03-30 | 2010-11-10 | 南方电网技术研究中心 | DC de-icing device without special rectifier transformer and protection method thereof |
| CN101882774B (en) * | 2010-03-30 | 2012-09-26 | 南方电网科学研究院有限责任公司 | DC de-icing device without special rectifier transformer and protection method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CSG ELECTRIC POWER RESEARCH INSTITUTE CO., LTD. Free format text: FORMER OWNER: SOUTHERN POWER GRID TECHNOLOGY RESEARCH CENTER Effective date: 20111026 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 510623 GUANGZHOU, GUANGDONG PROVINCE TO: 510050 GUANGZHOU, GUANGDONG PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20111026 Address after: 510050, Guangdong, Guangzhou, Yuexiu District Dongfeng East Road, Qi Gang, No. 6, No. 8, West Tower, 13-20 floor Patentee after: Research Institute of Southern Power Grid Co., Ltd. Address before: 510623 Guangdong city of Guangzhou province Tianhe District Pearl River Metro Chinese Sui Road No. 6 Patentee before: Southern Power Grid Technology Research Center |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110518 |