CN201829904U - Direct current ice thawing device with special rectifier transformer - Google Patents
Direct current ice thawing device with special rectifier transformer Download PDFInfo
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- CN201829904U CN201829904U CN2010201510117U CN201020151011U CN201829904U CN 201829904 U CN201829904 U CN 201829904U CN 2010201510117 U CN2010201510117 U CN 2010201510117U CN 201020151011 U CN201020151011 U CN 201020151011U CN 201829904 U CN201829904 U CN 201829904U
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- 238000010257 thawing Methods 0.000 title abstract 5
- 238000002955 isolation Methods 0.000 claims abstract description 10
- 230000004224 protection Effects 0.000 claims description 85
- 238000002844 melting Methods 0.000 claims description 32
- 230000008018 melting Effects 0.000 claims description 15
- 238000005259 measurement Methods 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 abstract description 6
- 230000010349 pulsation Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000009499 grossing Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 230000008014 freezing Effects 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 241000006966 Areva Species 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The utility model discloses a direct current ice thawing device with a special rectifier transformer, which comprises an alternating current side power supply circuit breaker QF, an isolation switch K, the rectifier transformer, valve side current transformers Ivya, Ivyb, Ivyc, Ivda, Ivdb and Ivdc, a current converter, direct current side voltage transformers Udp and Udn, direct current side current transformers Idp, Idn and Idgnd and direct current side isolators S1, S2, S3 and S4. The direct current ice thawing device has a reasonable design, less investment and a low cost and ensures to meet the requirement for each line to safely and quickly thaw ice; and the investment of the direct current ice thawing device is reduced. The direct current ice thawing device with the special rectifier transformer has the advantages of ingenious design, excellent performance, low investment and complete protecting functions and is convenient and practical.
Description
Technical field
The utility model is a kind of DC de-icing device with special rectifier transformer, belongs to the innovative technology of the DC de-icing device of being with special rectifier transformer.
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, DC filter and 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, and cost is low, guarantees to satisfy the DC de-icing device of band special rectifier transformer of the demand of the quick ice-melt of each line security.
The technical solution of the utility model is: the DC de-icing device of the utility model band special rectifier transformer, include AC side power supply circuit breaker Q F, isolation switch K, rectifier transformer, current on valve side instrument transformer Ivya, Ivyb, Ivyc, Ivda, Ivdb and Ivdc, converter, dc voltage instrument transformer Udp and Udn, DC side current transformer Idp, Idn and Idgnd, DC side disconnecting link S1, S2, S3 and S4, current on valve side instrument transformer Ivya wherein, Ivyb, Ivyc, Ivda, the end of Ivdb and Ivdc is connected with power supply by isolation switch K and AC side power supply circuit breaker Q F, current on valve side instrument transformer Ivya, Ivyb, Ivyc, Ivda, the other end of Ivdb and Ivdc 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, and converter is by DC side current transformer Idgnd ground connection, 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, rectification change net side three-phase current, rectifier transformer star side three-phase current, rectifier transformer angle side three-phase current, DC side earth current, DC side electric current, dc voltage DC side electric current.
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; The guard method of the DC de-icing device of the utility model band special rectifier transformer 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, the DC de-icing device and the guard method thereof of convenient and practical band special rectifier transformer.
Description of drawings
Fig. 1 is DC de-icing device main electrical scheme and the measurement point configuration schematic diagram thereof that the utility model proposes the band special rectifier transformer.
Fig. 2 is a DC de-icing device ice-melt loop schematic diagram.
Fig. 3 is that the only mountain of 500kV becomes 115MW DC de-icing device main electrical scheme schematic diagram among the embodiment.
Fig. 4 is that 500kV Guilin becomes 225MW DC de-icing device main electrical scheme schematic diagram among the embodiment.
Embodiment:
The DC de-icing device measurement point that the utility model proposes the band special rectifier transformer is arranged as shown in Figure 1, include AC side power supply circuit breaker Q F, isolation switch K, rectifier transformer, current on valve side instrument transformer Ivya, Ivyb, Ivyc, Ivda, Ivdb and Ivdc, converter, dc voltage instrument transformer Udp and Udn, DC side current transformer Idp, Idn and Idgnd, DC side disconnecting link S1, S2, S3 and S4, current on valve side instrument transformer Ivya wherein, Ivyb, Ivyc, Ivda, the end of Ivdb and Ivdc is connected with power supply by isolation switch K and AC side power supply circuit breaker Q F, current on valve side instrument transformer Ivya, Ivyb, Ivyc, Ivda, the other end of Ivdb and Ivdc 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, and converter is by DC side current transformer Idgnd ground connection, 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, rectification change net side three-phase current, rectifier transformer star side three-phase current, rectifier transformer angle side three-phase current, DC side earth current, DC side electric current, dc voltage DC side electric current.
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 power supply of DC de-icing device can directly be taken from generator (or generator car), but more is to take from AC network.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.Ice melting current (surpassing 3000A) and capacity (surpassing 50MW) that typical case 500kV circuit needs are bigger, and ac-side current also surpasses 2500A.Though the effective ice-melt distance of 500kV main transformer 35kV during directly as voltage on valve side can satisfy the ice-melt demand of various Typical Route, converter directly should not be connected on 500kV main transformer 35kV side, needs to insert by professional rectifier transformer.To capacity near or surpass 500kV main transformer 35kV side capacity DC de-icing device and need adopt special rectifier transformer to insert 500kV main transformer 220kV side.The main electrical scheme of band special rectifier transformer as shown in Figure 1, adopt 12 pulsation rectifications, and earth point is set up in two 6 fluctuation bridge junctions, inserts 500kV main transformer 35kV or 220kV side by a three-phase three winding rectifier transformers or two three-phase double winding rectifier transformers.Consider the short-time characteristic of the less and ice-melt of idle and harmonic wave that 12 pulsation produce, bank of filters be can not dispose and reactive power compensation and harmonic wave inhibition carried out, 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.
The main effect of smoothing reactor is to prevent discontinuous current, restriction current pulsation and short circuit current in the commutating circuit.The 500kV line reactance is bigger more than 10 times than D.C. resistance, time constant T=L/R＞4/314=31.8ms, the pulsation period Ts=20/6=3.3ms of 6 pulsation full-wave bridge rectifiers, the time constant in the pulsation period Ts=20/12=1.67ms ice-melt loop of 12 pulsation full-wave bridge rectifiers is much larger than the current pulsation cycle, electric current not only can be not interrupted, and it has been constant electric current (the load circuit time constant is much larger than 6 times of pulsation periods), so more do not need to be provided with special smoothing reactor.
Rectifier transformer provides suitable voltage on valve side, can provide the ice melting current and the direct voltage that need at dissimilar and circuit length, is beneficial to the selection of converter working point, and adaptability is better; And rectifier transformer provides the isolation of ac/dc, and its short-circuit impedance satisfies the requirement of restriction thyristor valve short circuit current under the failure condition, does not need to be provided with specially commutating reactance.
The DC de-icing device operation that the utility model proposes the band special rectifier transformer time can be adopted the ice-melt mode 1 of Fig. 2, i.e. DC side S1, S3 closure among Fig. 2, and S2, S4 disconnect; AC side isolation switch K, switch QF closure also can adopt ice-melt mode 2 shown in Figure 2, i.e. DC side S1, S2, S3 closure among Fig. 2, and S4 disconnects; AC side isolation switch K, switch QF closure.
The DC de-icing device protection zone that the utility model proposes the band special rectifier transformer is divided into the 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 15 kinds of protections; wherein the 1-14 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, and whether whether the resistance value of alternating current circuit that inspection is melted correct or complete to confirm the alternating current circuit with the alternating current circuit impedance difference of actual set.
The guard method of the DC de-icing device of the utility model band special rectifier transformer, when ice-melt, whether whether the resistance value of alternating current circuit that inspection is melted correct or complete to confirm the alternating current circuit with the alternating current circuit impedance difference of actual set, and protection divides two sections:
1)Max(|Udp-Udn|/Idp，|Udp-Udn|/Idn)-Rset＞K1*Rset；
2)Max(|Udp-Udn|/Idp，|Udp-Udn|/Idn)-Rset＞K2*Rset
In the formula: Udp DC side cathode voltage, Udn DC side cathode voltage, the anodal electric current of Idp DC side, Idn DC side cathodal current, Rset DC ice-melting rated value of resistance, K1 are I section (section of reporting to the police) definite value, and K2 is II section (tripping operation section) definite value.
The guard method of the DC de-icing device of the utility model band special rectifier transformer, its protection sequence of movement is as follows:
1) satisfy Max (| Udp-Udn|/Idp, | Udp-Udn|/Idn)-Rset＞start the I section during K1*Rset formula to report to the police;
2) satisfy Max (| Udp-Udn|/Idp, | Udp-Udn |/Idn)-Rset＞start II section action phase shift locking during the K2*Rset formula, jump AC circuit breaker, the locking AC circuit breaker.
Above-mentioned K1 gets 0.1-0.2, time-delay 300-800ms, and K2 gets 0.2-0.5, time-delay 100-300ms.
The characteristics of this DC de-icing device main electrical scheme are:
1) adopts 12 pulsation rectifications, reduce the harmonic wave of injected system and the idle demand of system;
2) earth point is set up in two 6 fluctuation bridge junctions, reduces the DC side insulating requirements, and provides measuring point for the ground connection overcurrent protection function.
3) insert 500kV main transformer 35kV or 220kV side by three-phase three winding rectifier transformers or two three-phase double winding rectifier transformers.
4) do not need to be provided with specially commutating reactance.
5) do not need to be provided with specially smoothing reactor.
6) do not need configuring direct current filter (trap).
7) can be used for 500kV and 220kV 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 determines that according to DC de-icing device operating mode and the comprehensive back of reactive power compensation needs alternating current filter is connected on the 35kV bus.
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 the DC de-icing device of table 3 band special rectifier transformer
| 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 ground connection overcurrent protection | The converter unit protection district |
| 8? | The thyristor junction temperature monitors | The converter unit protection district |
| 9? | The false triggering protection | The converter unit protection district |
| 10? | DC over-voltage protection | The DC ice-melting protection zone |
| 11? | The direct current under-voltage protection | The DC ice-melting protection zone |
| 12? | Direct current 50Hz protection | The DC ice-melting protection zone |
| 13? | Direct current 100Hz protection | The DC ice-melting protection zone |
| 14? | The open circuit test protection | The DC ice-melting protection zone |
| 15? | The DC ice-melting impedance protection | The DC ice-melting protection zone |
Guizhou electrical network Fuquan transformer station in 1-2 month ice damage in 2008 all 500kV outlets all owing to icing seriously damages.In this transformer station one cover 60MW band special rectifier transformer DC de-icing device was installed in 2008 DC ice melting has been carried out in all 500kV outlets.From table 3 (500kV of Fuquan transformer station outlet 1-1 ice-melt mode major parameter) and table 4 (500kV of Fuquan transformer station outlet 1-2 ice-melt mode major parameter) as can be seen this DC de-icing device can satisfy the demand of all 500kV 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 6.
The DC de-icing device main electrical scheme of the band special rectifier transformer that the utility model proposes in addition, and measurement point collocation method thereof also are applied in Guizhou 500kV and put out transformer stations such as peak change, the change of 500kV Anshun, 500kV only mountain change and Guangxi 500kV Guilin change.
In January, 2009, sleety weather appears in middle part, Guizhou Province, east, northern territory, some circuit icing, and thickness reaches 5～10mm.On January 8th, 2,009 500 kilovolts of good fortune are executed II loop line road.Icing on this circuit is glaze, is solid ice cube shape, and thickness reaches 8mm respectively.Switching on, the icing on the lead all comes off at once after 10 minutes.This is the DC de-icing device that first in the world cover is successfully applied to the actual ice-melt in 500kV transmission line of alternation current
The table 4:500kV Fuquan 500kV of transformer station outlet 1-1 ice-melt mode major parameter calculates
The table 5:500kV Fuquan 500kV of transformer station outlet 1-2 ice-melt mode major parameter calculates
The table 6 Fuquan 60MW of transformer station band special rectifier becomes the DC de-icing device important technological parameters
Claims (4)
1. DC de-icing device with special rectifier transformer, it is characterized in that including AC side power supply circuit breaker Q F, isolation switch K, rectifier transformer, current on valve side instrument transformer Ivya, Ivyb, Ivyc, Ivda, Ivdb and Ivdc, converter, dc voltage instrument transformer Udp and Udn, DC side current transformer Idp, Idn and Idgnd, DC side disconnecting link S1, S2, S3 and S4, current on valve side instrument transformer Ivya wherein, Ivyb, Ivyc, Ivda, the end of Ivdb and Ivdc is connected with power supply by isolation switch K and AC side power supply circuit breaker Q F, current on valve side instrument transformer Ivya, Ivyb, Ivyc, Ivda, the other end of Ivdb and Ivdc 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, and converter is by DC side current transformer Idgnd ground connection, 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. the DC de-icing device of band special rectifier transformer according to claim 1 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, rectification change net side three-phase current, rectifier transformer star side three-phase current, rectifier transformer angle side three-phase current, DC side earth current, DC side electric current, dc voltage DC side electric current.
3. the DC de-icing device of band special rectifier transformer according to claim 1 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. the DC de-icing device of band special rectifier transformer according to claim 1 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.
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| CN2010201510117U CN201829904U (en) | 2010-03-30 | 2010-03-30 | Direct current ice thawing device with special rectifier transformer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101877470A (en) * | 2010-03-30 | 2010-11-03 | 南方电网技术研究中心 | Direct current thawing apparatus with special rectiformer and protection method thereof |
| CN104810801A (en) * | 2015-04-28 | 2015-07-29 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Tubular bus current differential protection method applicable to direct-current ice melting system rectifying device |
| CN107204607A (en) * | 2016-03-18 | 2017-09-26 | 全球能源互联网研究院 | A kind of guard method of SSSC |
| CN108414874A (en) * | 2018-03-09 | 2018-08-17 | 中铁十局集团电务工程有限公司 | Differential protection circuit method of calibration, device and equipment |
-
2010
- 2010-03-30 CN CN2010201510117U patent/CN201829904U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101877470A (en) * | 2010-03-30 | 2010-11-03 | 南方电网技术研究中心 | Direct current thawing apparatus with special rectiformer and protection method thereof |
| CN101877470B (en) * | 2010-03-30 | 2012-09-26 | 南方电网科学研究院有限责任公司 | Direct-current ice melting device with special rectifier transformer and protection method thereof |
| CN104810801A (en) * | 2015-04-28 | 2015-07-29 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Tubular bus current differential protection method applicable to direct-current ice melting system rectifying device |
| CN104810801B (en) * | 2015-04-28 | 2017-07-11 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Suitable for the pipe bus current differential protecting method of direct current ice melting system fairing |
| CN107204607A (en) * | 2016-03-18 | 2017-09-26 | 全球能源互联网研究院 | A kind of guard method of SSSC |
| CN107204607B (en) * | 2016-03-18 | 2019-08-27 | 全球能源互联网研究院 | A Protection Method for Static Synchronous Series Compensator |
| CN108414874A (en) * | 2018-03-09 | 2018-08-17 | 中铁十局集团电务工程有限公司 | Differential protection circuit method of calibration, device and equipment |
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