CN101640424B - On-off system of 1000kV AC ultrahigh-voltage transmission line - Google Patents

Abstract

The invention specifically discloses an on-off system of a 1000kV AC ultrahigh-voltage (UHV) transmission line. The system comprises a feed side system UHV transformer, a feed side system UHV breaker, an ultrahigh-voltage line, a receiving side UHV breaker and a receiving side system UHV transformer. One end of the feed side system UHV breaker is connected with a high-voltage side bus of the feed side system UHV transformer, and the other end thereof is connected with one end of the receiving side UHV breaker by the ultrahigh-voltage line. The other end of the receiving side UHV breaker is connected with a high-voltage side bus of the receiving side system UHV transformer. The system can satisfy the requirement of the 1000kV AC ultrahigh-voltage transmission system.

Description

A 1000kV AC UHV Transmission Line Opening and Closing System

technical field

The invention relates to the field of ultra-high voltage transmission, in particular to a switching system for 1000kV AC ultra-high voltage transmission lines.

Background technique

Since nearly 2/3 of my country's exploitable hydropower resources are in the west, and 2/3 of coal resources are in Shanxi, Shaanxi and Inner Mongolia; however, 2/3 of my country's electricity load is distributed in the eastern coastal areas and economic areas east of the Beijing-Guangzhou Railway. developed areas. In this way, it is necessary to transmit the power generated by the energy base to the central and eastern regions where the power demand is large.

In order to reduce transmission loss and improve transmission quality, my country is currently developing UHV transmission technology. UHV AC transmission refers to AC transmission projects and related technologies with a voltage level of 1000kV and above. UHV transmission technology has the characteristics of long distance, large capacity, low loss and economy.

In the UHV power system, when the transmission line circuit breaker performs closing and opening operations, various operating overvoltages will be generated. For the 1000kV AC UHV transmission system in my country, since the reactive power of the UHV line itself is very large, the reactive power of each 100km line can reach about 530Mvar. In addition, most of my country's UHV transmission lines have the characteristics of long-distance and large-capacity transmission of electric energy, which makes my country's UHV transmission line opening and closing operation overvoltage and other overvoltages that endanger system safety more prominent.

The overvoltage of the closing and opening operation will have a great impact on the safety of line equipment and systems. At the same time, considering the factors of electrical equipment manufacturing and high altitude in some areas, it has put forward very high requirements for the overvoltage limit of my country's UHV AC system. . Other countries in the world have built 1000kV AC UHV power transmission and transformation projects, but at present, my country is the first to adopt 1000kV UHV AC power transmission technology, and because my country's national conditions are different from other countries, it is impossible to copy the existing technology and experience of other countries , It is necessary to independently innovate the key technologies in the 1000kV AC UHV power transmission and transformation project.

Therefore, the design and development of the opening and closing system for 1000kV AC UHV transmission lines to limit the overvoltage problem that endangers equipment safety and system operation reliability to a reasonable level at a reasonable cost is a technology that technicians in the UHV transmission field urgently need to solve. question.

Contents of the invention

The technical problem to be solved by the present invention is to provide a 1000kV AC UHV transmission line opening and closing system, which can meet the requirements of the 1000kV AC UHV transmission system.

In order to solve the above technical problems, the present invention provides a 1000kV AC UHV transmission line opening and closing system, the system includes: feeder side system UHV transformer, feeder side UHV circuit breaker, UHV transmission line, power receiving side UHV circuit breakers, and UHV transformers for receiving side systems;

One end of the UHV circuit breaker on the feeder side is connected to the high-voltage side bus bar of the UHV transformer of the feeder-side system, and the other end receives one end of the UHV circuit breaker on the power-side through the UHV transmission line; the UHV circuit breaker on the power-receiving side The other end of the device is connected to the high-voltage side bus bar of the UHV transformer of the receiving side system;

Wherein, the UHV circuit breaker on the feeding side is used to realize the opening and closing operation between the UHV power transmission line and the UHV transformer on the feeding side; the UHV circuit breaker on the receiving side is used to realize the UHV power transmission Opening and closing operations between the line and the UHV transformer of the receiving side system;

Both the UHV transformer of the feeding side system and the UHV transformer of the receiving side system are UHV step-up transformers, which are used to realize the conversion between 500kV ultra-high voltage alternating current, 1000kV ultra-high voltage alternating current and 110kV high-voltage alternating current, wherein the voltage side inputs 500kV ultra-high voltage Alternating current, its high-voltage side outputs 1000kV UHV AC, and its low-voltage side outputs 110kV high-voltage AC

Both the UHV circuit breaker on the feeding side and the UHV circuit breaker on the receiving side are equipped with a closing resistor, but not an opening resistor.

Preferably, the feeder-side UHV circuit breaker includes: a feeder-side main switch, a feeder-side resistance switch, and a feeder-side closing resistor;

One end of the feeding-side switching resistor and one end of the feeding-side main switch are connected to the high-voltage side of the feeding-side system UHV transformer; the other end of the feeding-side switching resistor is connected to the feeding One end of the side resistance switch is connected; the other end of the feed-side resistance switch and the other end of the feed-side main switch are jointly connected to the UHV transmission line;

Wherein, the feeding-side closing resistor is connected in series with the feeding-side resistive switch, which is used to limit the overvoltage of the closing operation of the UHV transmission line.

Preferably, the switching resistance of the feeder side has a value of 400-600 ohms, and its connection time is 8-11 ms.

Preferably, the UHV circuit breaker on the receiving side includes: a main switch on the receiving side, a resistance switch on the receiving side, and a closing resistor on the receiving side;

One end of the receiving-side closing resistor and one end of the receiving-side main switch are connected to the high-voltage side of the receiving-side system UHV transformer; the other end of the receiving-side closing resistor is connected to the receiving-side main switch. One end of the resistance switch on the power receiving side is connected; the other end of the resistance switch on the receiving side and the other end of the main switch on the receiving side are jointly connected to the UHV transmission line;

Wherein, the receiving-side closing resistor is connected in series with the receiving-side resistive switch, and is used to limit the overvoltage of the closing operation of the UHV transmission line.

Preferably, the closing resistance of the power receiving side has a value of 400-600 ohms, and its connection time is 8-11 ms.

Compared with the prior art, the present invention has the following advantages:

The opening and closing system of the 1000kV AC UHV transmission line of the present invention includes a UHV transformer of the feeding side system, a UHV circuit breaker of the feeding side, an UHV transmission line, a UHV circuit breaker of the receiving side, and a UHV transformer of the receiving side system; One end of the UHV circuit breaker on the feeder side is connected to the high-voltage side bus bar of the UHV transformer of the feeder-side system, and the other end receives one end of the UHV circuit breaker on the power-side through the UHV transmission line; the UHV circuit breaker on the power-receiving side The other end of the transformer is connected to the high-voltage side busbar of the UHV transformer of the receiving side system.

Based on the electromagnetic transient simulation research results of the typical UHV AC transmission system closing and opening operation overvoltage and the transient recovery voltage of the circuit breaker, the opening and closing system of the present invention is designed to ensure that the 1000kV line is closed and opened. The gate operation overvoltage and the transient recovery of the circuit breaker are limited within the allowable range. In addition to the installation of a 1000kV line high-resistance and a surge arrester with a rated voltage of 828kV, a closing resistor should be installed on the UHV circuit breaker. The opening and closing system of the invention reduces the engineering cost, improves the reliability of the equipment and the operation reliability of the whole UHV system.

Description of drawings

Fig. 1 is the structural diagram of the opening and closing system of the 1000kV AC UHV transmission line of the present invention;

Figure 2 is the equivalent circuit diagram of the UHV transmission line under the condition of closing and no load.

Detailed ways

The technical problem to be solved by the present invention is to provide a 1000kV AC UHV transmission line opening and closing system, which can limit the overvoltage problem that endangers equipment safety and system operation reliability to a reasonable level at a reasonable cost, and meets the requirements of 1000kV AC UHV transmission system requirements.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to FIG. 1 , it is a structural diagram of the opening and closing system of the 1000kV AC UHV transmission line according to the present invention.

The opening and closing system includes: UHV transformer 10 of the feeding side system, UHV circuit breaker 20 of the feeding side, UHV transmission line 30 , UHV circuit breaker 40 of the receiving side, and UHV transformer 50 of the receiving side system.

The UHV transformer 10 of the feeding side system and the UHV transformer 50 of the receiving side system are both UHV (Ultra High Voltage, Ultra High Voltage) step-up transformers, which are used to realize the connection between 500kV ultra-high voltage alternating current and 1000kV ultra high voltage alternating current and 110kV high voltage alternating current. Transformation, where the high-voltage side inputs 500kV ultra-high voltage alternating current, its high-voltage side outputs 1000kV ultra-high-voltage alternating current, and its low-voltage side outputs 110kV high-voltage alternating current.

One end of the feeder-side UHV circuit breaker 20 is connected to the high-voltage side busbar of the feeder-side system UHV transformer 10, and the other end receives one end of the power-side UHV circuit breaker 40 through the UHV transmission line 30; The other end of the power-side UHV circuit breaker 40 is connected to the high-voltage-side bus bar of the power-receiving-side system UHV transformer 50 .

Wherein, the UHV circuit breaker 20 on the feeder side is used to realize the opening and closing operation between the UHV transmission line 30 and the UHV transformer 10 of the feeder side system; the UHV circuit breaker 40 on the receiving side is used to The opening and closing operation between the UHV transmission line 30 and the UHV transformer 50 of the receiving side system is realized.

The UHV transmission line 30 is used to transmit 1000kV UHV AC power, and UHV equipment such as high voltage reactors can be installed on the line according to the needs of reactive power compensation.

As shown in FIG. 1 , the feeder-side UHV circuit breaker 20 includes: a feeder-side main switch K11 , a feeder-side resistance switch K12 , and a feeder-side closing resistor R _H1 .

One end of the feeding-side switching resistor R _H1 and one end of the feeding-side main switch K11 are connected to the high-voltage side of the feeding-side system UHV transformer 10; the other end of the feeding-side switching resistor R _H1 One end is connected to one end of the feed-side resistance switch K12; the other end of the feed-side resistance switch K12 is connected to the UHV transmission line 30 together with the other end of the feed-side main switch K11.

Wherein, the feeding-side switching resistor R _H1 is connected in series with the feeding-side resistance switch K12 to limit the overvoltage of the switching-on operation of the UHV transmission line.

As shown in FIG. 1 , the receiving-side UHV circuit breaker 40 includes: a receiving-side main switch K21 , a receiving-side resistance switch K22 , and a receiving-side closing resistor R _H2 .

One end of the receiving-side closing resistor R _H2 and one end of the receiving-side main switch K21 are connected to the high-voltage side of the receiving-side system UHV transformer 50; the other end of the receiving-side closing resistor R _H2 One end is connected to one end of the receiving-side resistive switch K22; the other end of the receiving-side resistive switch K22 is connected to the UHV transmission line 30 together with the other end of the receiving-side main switch K21.

Wherein, the closing resistor R _H2 on the receiving side is connected in series with the resistive switch K22 on the receiving side, and is used to limit the overvoltage of the closing operation of the UHV transmission line.

The operating overvoltage occurs during the transition process caused by the change of the working state of the L-C circuit. Considering the impact of overvoltage problems on equipment cost and system safety, the relative statistical operating overvoltage level limit target for UHV systems recommended abroad is 1.6~1.8p.u. In my country, considering the long transmission distance of a single UHV line and the influence of altitude in some areas, the recommended operating overvoltage limit target is: for substations and switchyard equipment at both ends of the line, it should be limited to 1.6p.u; for long lines The middle section is limited to under 1.7p.u.

Relevant research results show that for a 1000kV UHV transmission line, if only the MOA (lightning arrester) on both sides of the transmission line is used to limit the closing operation overvoltage, when the line length exceeds 200km, the statistical operation overvoltage in the middle part of the line will exceed 1.8pu; when the line length increases to 400-600km, the relative statistical operating overvoltage of the middle part of the line increases to 1.95-2.10pu, and the phase-to-phase statistical overvoltage increases to 3.5-3.5pu. Therefore, it is not enough to rely on MOA to limit the closing overvoltage for most UHV lines. In the opening and closing system of 1000kV AC UHV transmission lines proposed by the present invention, the UHV circuit breaker 20 on the feeding side is provided with a feeding side The closing resistor R _H1 and the receiving-side closing resistor R _H2 provided for the receiving-side UHV circuit breaker 40 are used to suppress the overvoltage generated during the line closing operation.

The specific operation process can be illustrated by the equivalent circuit diagram of the UHV transmission line in the case of closing and no load shown in Figure 2.

Wherein, as shown in FIG. 2 , in the case of closing and no load, it can be considered that one side of the UHV transmission line 30 is connected to the UHV transformer 10 of the feeding side system through the UHV circuit breaker 20 on the feeding side, and the other end is connected to the UHV transformer 10 of the feeding side system. The UHV circuit breaker 40 on the receiving side is disconnected, and the terminal is suspended in the air. At this time, for the sake of simplicity, the UHV transmission line is equivalently replaced by an equivalent resistance R, an equivalent inductance L, and an equivalent capacitance C.

The closing process of the UHV transmission line is divided into two stages: the first stage is that the feeder side resistance switch K12 is first closed, and the feeder side closing resistor R _H1 is connected to the circuit; the second stage is that the feeder side main The switch K11 is closed, and the closing resistor R _H1 of the feeding side is short-circuited; the whole closing process ends.

Regardless of the feeder side or the power receiving side, during the closing process, the closing circuit plays a damping role on the free component, reducing the overvoltage amplitude of the closing operation. From the point of view of limiting the overvoltage of closing operation, it is hoped that the closing resistance is larger when the resistance switch K2 is closed; and that the closing resistance is smaller when the main switch K1 is closed. Therefore, it is necessary to make a reasonable selection of the resistance value of the closing resistor R _H in combination with the actual engineering situation. The value of the closing resistor R _H in the embodiment of the present invention may be 400-600 ohms, and the switching time may be 8-11 ms.

That is, in practical applications, the values of the switching resistor R _H1 on the feeder side and the switching resistor R _H2 on the receiving side need to be specifically set according to actual engineering conditions. However, in the embodiment of the present invention, the value of the switching resistor R _H1 on the feeder side can be 400-600 ohms, and the connection time can be 8-11 ms; the value of the switching resistor R _H2 on the receiving side can be It can also be 400-600 ohms, and the access time can be 8-11 ms.

The traditional point of view is that for the circuit breaker of the UHV transmission line opening and closing system, it is necessary to add an opening resistor to suppress the opening overvoltage. However, the technicians of the present invention have found through research that: for the UHV AC line closing and opening system, only the closing resistor needs to be installed, and the corresponding overvoltage requirements can be met without installing the opening resistor, and at the same time, the installation of the opening resistor can be avoided. Some problems caused by resistance.

Its specific research includes the following aspects:

(1) Based on the electromagnetic transient simulation research results of the overvoltage of the opening operation of the AC UHV test demonstration project, the 1000kV circuit breaker is only equipped with a closing resistor but not an opening resistor. The limiting effect of the overvoltage proves that it is feasible and effective to use other limiting measures instead of installing the opening resistor of the circuit breaker.

The electromagnetic transient simulation test is carried out for the overvoltage of the opening operation of the UHV AC transmission line. The test results show that in most cases, only the MOA with a rated voltage of 828kV and the high reactance of conventional lines can limit the overvoltage of substations and switching stations to less than 1.6p.u; It is limited below 1.7p.u; in addition, the multi-point grounding method of good conductor ground wire can also limit the overvoltage of single-phase ground fault load shedding operation; Line lengths are limited to meet overvoltage level requirements. For the overvoltage of the fault clearing transfer operation, only the MOA with a rated voltage of 828kV at both ends of the line can limit the overvoltage of the UHV transmission line to clear the single-phase ground fault transfer operation within the allowable range; Voltage, because it will not endanger the safety of substation equipment (it is still below 1.6p.u at both ends of the line), it only affects the insulation of the line tower, and the insulation is self-restoring insulation, and its occurrence probability is extremely low, so there is no need to take measures More measures. If it must be considered, the method of installing a group of MOA in the middle of the line can limit the overvoltage within the allowable range. Compared with installing the opening resistor, this measure is more economical and more reliable.

(2) Combined with domestic and foreign power grid operation experience, the probability of occurrence of severe overvoltage conditions and the probability of failure of the opening and closing resistors are analyzed, and the economical problems of installing opening and closing resistors are pointed out.

According to the statistical situation of the operation of 500kV power grid in my country, as of 2002, only one three-phase short-circuit fault was counted. For UHV transmission lines, the possibility of two-phase and three-phase short-circuit faults is estimated to be lower. For the circuit breaker of the UHV transmission line opening system, if the opening resistor is installed, the probability of failure of the opening resistor itself is much higher than that of serious short-circuit faults such as two-phase or three-phase short circuit; overvoltage and opening overvoltage, the damage rate is even higher; thus, it is uneconomical and unreasonable to use a component with a relatively high damage rate to protect a fault with a much lower probability of occurrence .

(3) For the circuit breaker of the UHV AC test demonstration project, the TRV simulations of the out-of-step fault and various short-circuit faults were carried out under the two conditions of installing the opening resistor and not installing the opening resistor. According to the results of the simulation study, it is proposed that the opening resistor may not be installed.

According to the requirements of circuit breaker assessment conditions stipulated in my country and IEC high-voltage AC circuit breaker standards, considering the current and long-term system conditions of the UHV test demonstration project, serious out-of-step disconnection failures and three-phase short circuits at the end of the circuit breaker should be considered. The TRV situation in severe short-circuit faults is simulated and studied. The relevant research results of the present invention show that the maximum peak value and rising rate of the circuit breaker TRV in the three UHV stations in Jindongnan, Nanyang and Jingmen can meet the 1100kV circuit breaker power in my country listed in Table 1 without using the opening resistor. TRV test parameter requirements specified in industry standards and IEC circuit breaker standard extensions.

After the UHV circuit breaker is installed with a 600 ohm opening resistor, it only has a certain effect on reducing the peak value and rising rate of the main fracture TRV of the circuit breaker under the condition of small short-circuit current, while the main fracture under the condition of rated short-circuit breaking current (50kA) The limiting effect of TRV is not obvious; when the out-of-synchronization fault occurs, although the TRV level of the main fracture has a certain decrease, the TRV peak value of the auxiliary fracture is significantly increased compared with the case of no opening resistance, and even exceeds the relevant standards. The specified test parameter requirements, but the current equipment manufacturing capabilities and test assessment conditions of many manufacturers cannot meet the above requirements, and also increase the equipment cost.

Therefore, from the perspective of limiting the TRV of the UHV circuit breaker, it is not necessary to install a tripping resistor.

Table 1 1100kV circuit breaker recovery voltage test parameter requirements

(4) Based on the research and analysis results of the zero drift problem mechanism and influencing factors when the circuit breaker of the AC UHV test demonstration project breaks the short-circuit current, it is proposed that the occurrence probability of the zero drift of the UHV short-circuit current is extremely low, and the installation of the opening resistor is corrected. Misjudgment of zero drift can be eliminated.

According to the traditional theory, installing an opening resistor on the circuit breaker can eliminate the problem of zero point drift when the circuit breaker breaks the short-circuit current. However, according to the relevant research results of the present invention on the zero point drift problem, the generation of the zero point drift phenomenon is mainly related to two factors: one is the moment of failure; the other is the ratio of the AC component of the short circuit current to the load current and the nature of the load current. Drift mainly occurs in small short-circuit current systems. It can be seen that the installation of the opening resistor of the circuit breaker has nothing to do with the zero point drift, and the problem of zero point drift when the circuit breaker breaks the short-circuit current cannot be eliminated.

(5) Research on the thermal capacity of 1000kV circuit breaker when the opening resistor is installed, analyze the thermal capacity requirements when using the opening and closing resistor, and propose that it is not feasible to use the opening resistor for 1000kV circuit breaker in actual engineering.

Since the opening and closing generally share a resistor, the energy problem is the biggest problem when using the opening resistor. The decisive role of the opening and closing resistance energy is not to limit the energy consumption in the process of operating overvoltage, but other opening and closing requirements of the circuit breaker. This requirement is also reflected in the circuit breaker test requirements. According to the test conditions stipulated in the relevant standards, specifications and technical conditions of the circuit breaker, the heat capacity of the closing/opening resistance of the UHV circuit breaker is calculated, and the possible occurrence of the Jindongnan-Nanyang-Jingmen UHV transmission system under the current and long-term system conditions The energy consumption absorbed by the closing/opening resistor under the fault and operation is simulated and studied. Based on the calculation results of these two aspects, the following suggestions are put forward for the energy consumption of the closing/opening resistance of the circuit breaker: (1) The circuit breaker is required to be able to withstand BTF opening + single out-of-step closing and opening operation, and the circuit breaker is equipped with 400~600Ω When using the gate resistance (common resistance for closing and opening), the absorbing energy consumption capacity of the closing and opening resistors should not be less than 165~247MJ, as shown in Table 2; (2) If the circuit breaker is allowed to close twice under the condition of out of step Open (CO-t-CO), then for a circuit breaker with a 600Ω closing/opening resistance (common resistance for closing and opening), the energy consumption of the closing/opening resistance is 247.3MJ (regardless of the resistance in the two operation time intervals heat dissipation). At present, there are very few circuit breaker manufacturers that can achieve the above-mentioned manufacturing capacity, and its cost is also quite expensive. At the same time, it also increases the probability of equipment damage, so it is not feasible to apply it to actual projects.

Table 2 Suggested value of thermal capacity of closing/opening resistor of circuit breaker

Circuit breaker opening and closing resistor type Resistance energy (MJ) 400Ω closing resistance 45

500Ω closing resistance 36 600Ω closing resistance 30 400Ω closing/opening resistance 247 500Ω closing/opening resistance 198 600Ω closing/opening resistance 165

(6) According to the relevant research results of the present invention, when the circuit breaker is equipped with opening/closing resistance, the resistance value required to limit the operating overvoltage is difficult to be consistent. Research shows that when the opening and closing resistance is large, the limit operation overvoltage will be reduced. If the opening and closing resistance is 700Ω, it cannot meet the overvoltage limit requirements of the UHV test demonstration project; and when the resistance of the opening and closing resistance is reduced, the required energy consumption requirements will increase greatly. Based on the above considerations, it is proposed not to use the opening resistor, and the closing resistor of 400-600Ω can be used according to the situation, and the energy consumption requirement is 45-30MJ.

Based on the above-mentioned research results, the present invention proposes a UHV AC line closing and opening system, that is, a 1000kV line circuit breaker needs to be equipped with a closing resistor instead of an opening resistor. The resistance value of the closing resistor is generally 400-600 ohms and can be selected according to different projects. The connection time is 8-11ms, and the energy consumption requirement is 45-30MJ.

The 1000kV AC UHV transmission line opening and closing system of the present invention includes: UHV transformer, UHV circuit breaker, UHV transmission line, and UHV equipment side; one end of the UHV circuit breaker is connected to the high voltage side of the UHV transformer , and the other end receives the power-side UHV system through the UHV transmission line, and is used to realize the opening and closing operation between the UHV transmission line and the UHV transformer; and the UHV circuit breaker is equipped with a closing resistor but No opening resistor is installed.

Based on the electromagnetic transient simulation research results of the typical UHV AC transmission system closing operation overvoltage, the opening and closing system of the present invention, in order to ensure that the 1000kV line closing operation overvoltage is limited within the allowable range, in addition to including In addition to installing lightning rods with high impedance of the line and a rated voltage of 828kV, a closing resistor is installed on the UHV circuit breaker. The resistance value of the closing resistor is generally 400-600 ohms, and the resistance value can be selected according to different projects. The connection time is 8-11 ms, and the energy consumption requirement is 45-30 MJ. The opening and closing system of the invention reduces the engineering cost, improves the reliability of the equipment and the operation reliability of the whole UHV system.

Further, the present invention also corrects the one-sided or one-sided view that the installation of the opening resistor can solve the zero drift phenomenon that may occur in the UHV system, and can effectively reduce the transient recovery voltage level when breaking serious faults. Wrong assertion. At the same time, using the circuit breaker to install the opening resistor, which has a relatively high damage rate, to protect the multi-phase fault opening operation overvoltage that has a much lower probability of occurrence and does not cause too much damage to the electrical equipment of the substation and switch station. Uneconomical and unreasonable. And the installation of the opening resistor has certain defects in the heat capacity problem and the convenience of energy consumption.

Therefore, the circuit breaker of the opening and closing system of the present invention is only equipped with a closing resistor and not an opening resistor, which can limit the overvoltage problem that endangers the safety of equipment and the reliability of system operation to a reasonable level at a reasonable cost. Meet the requirements of 1000kV AC UHV transmission lines.

Above, a kind of 1000kV AC UHV transmission line opening and closing system provided by the present invention has been introduced in detail. In this paper, specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for To help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, the content of this specification It should not be construed as a limitation of the invention.

Claims (5)

1. 1000kV AC extra high voltage transmission line divide-shut brake system, it is characterized in that described system comprises: the UHV of supply side system transformer, supply side UHV circuit breaker, UHV transmission line, be subjected to electric side UHV circuit breaker and be subjected to electric side system UHV transformer;

The high-voltage side bus of described supply side UHV circuit breaker one end and the described supply side UHV of system transformer links, and the other end is accepted an end of electric side UHV circuit breaker through described UHV transmission line; The described described high-voltage side bus that is subjected to electric side system UHV transformer of another termination that is subjected to electric side UHV circuit breaker;

Wherein, described supply side UHV circuit breaker is used to realize the breaking-closing operating between described UHV transmission line and the described supply side UHV of the system transformer; Describedly be subjected to electric side UHV circuit breaker to be used to realize described UHV transmission line and the described breaking-closing operating that is subjected between the electric side system UHV transformer;

The described supply side UHV of system transformer and be subjected to electric side system UHV transformer to be the UHV step-up transformer, be used to realize the conversion between 500kV superhigh pressure alternating current and 1000kV extra-high-voltage alternating current electricity and the 110kV High Level AC Voltage, its medium voltage side input 500kV superhigh pressure alternating current, its high-pressure side output 1000kV extra-high-voltage alternating current electricity, its low-pressure side output 110kV High Level AC Voltage;

Described supply side UHV circuit breaker and describedly be subjected to electric side UHV circuit breaker all to install switching-on resistance, and do not install sub-gate resistance.

2. 1000kV AC extra high voltage transmission line divide-shut brake according to claim 1 system is characterized in that described supply side UHV circuit breaker comprises: supply side main switch, supply side resistance switch and supply side switching-on resistance;

One end of described supply side switching-on resistance and an end of described supply side main switch connect the high-pressure side of the described supply side UHV of system transformer jointly; One end of the other end of described supply side switching-on resistance and described supply side resistance switch links; The other end of the other end of described supply side resistance switch and described supply side main switch connects described UHV transmission line jointly;

Wherein, described supply side switching-on resistance is connected with described supply side resistance switch, is used to limit the closing operation overvoltage of UHV transmission line.

3. 1000kV AC extra high voltage transmission line divide-shut brake according to claim 2 system is characterized in that the value of described supply side UHV breaker closing resistance is 400～600 Europe, and be 8～11ms its turn-on time.

4. 1000kV AC extra high voltage transmission line divide-shut brake according to claim 1 system is characterized in that, describedly comprised by electric side UHV circuit breaker: be subjected to electric side main switch, be subjected to electric side resistance switch and be subjected to electric side switching-on resistance;

A described end of electric side switching-on resistance and the described end of electric side main switch that is subjected to of being subjected to connects the described high-pressure side that is subjected to electric side system UHV transformer jointly; The described other end of electric side switching-on resistance and the described end of electric side resistance switch that is subjected to of being subjected to links; The described other end of electric side resistance switch and the described other end of electric side main switch that is subjected to of being subjected to connects described UHV transmission line jointly;

Wherein, describedly be subjected to electric side switching-on resistance connected by electric side resistance switch, be used to limit the closing operation overvoltage of UHV transmission line with described.

5. 1000kV AC extra high voltage transmission line divide-shut brake according to claim 4 system is characterized in that, described to be subjected to the value of electric side UHV breaker closing resistance be 400～600 Europe, and be 8～11ms its turn-on time.

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