阅读说明：本技术 一种核电厂应急供电装置 (Emergency power supply device for nuclear power plant ) 是由 姜昊成 吴苏敏 朱文江 余银辉 于 2019-07-17 设计创作，主要内容包括：本发明提供一种核电厂应急供电装置,其包括多个配电盘以及多根带有接头的电缆；其中,每一配电盘的输入端均接入一个柴油发电机组,每一配电盘的内部母线上设置有一个用于连接电缆的螺栓孔,所述多个配电盘中每两个配电盘之间敷设有一根所述电缆,且所述电缆的接头与所述配电盘的内部母线上的螺栓孔的位置相对应。本发明提高了供电可靠性的同时,还降低了设计成本,控制了操作难度。(The invention provides an emergency power supply device for a nuclear power plant, which comprises a plurality of switchboards and a plurality of cables with joints; the power distribution board comprises a plurality of power distribution boards, wherein the input end of each power distribution board is connected with a diesel generator set, a bolt hole for connecting a cable is formed in an internal bus of each power distribution board, one cable is laid between every two power distribution boards in the plurality of power distribution boards, and the joint of each cable corresponds to the position of the bolt hole in the internal bus of each power distribution board. The invention improves the reliability of power supply, reduces the design cost and controls the operation difficulty.)

1. An emergency power supply device for a nuclear power plant is characterized by comprising a plurality of switchboards and a plurality of cables with joints; the power distribution board comprises a plurality of power distribution boards, wherein the input end of each power distribution board is connected with a diesel generator set, a bolt hole for connecting a cable is formed in an internal bus of each power distribution board, one cable is laid between every two power distribution boards in the plurality of power distribution boards, and the joint of each cable corresponds to the position of the bolt hole in the internal bus of each power distribution board.

2. The emergency power supply unit of a nuclear power plant as claimed in claim 1, further comprising a plurality of cable-containing boxes, wherein a portion of the bus bar led out from the inside of each distribution board is contained in the corresponding containing box.

3. The emergency power supply unit of claim 2, wherein the plurality of switchboards are arranged in parallel, and one accommodating box is disposed beside each switchboard, and a part of the bus bar led out from the inside of each switchboard is accommodated in the accommodating box corresponding to the switchboard.

4. The emergency power supply unit of nuclear power plant as claimed in claim 1, wherein said cable is one of a single copper core cable and a single aluminum core cable.

5. The emergency power supply unit of nuclear power plant according to claim 4, characterized in that the area of the cross section of the middle copper core of the single-core copper-core cable is 400-500 mm²The area range of the aluminum core cross section of the single-core aluminum core cable is 600-650 mm²。

6. The emergency power supply unit of a nuclear power plant according to claim 1, characterized in that when the diesel-electric generator set connected to the switchboard is available, the internal bus of the switchboard is disconnected from its corresponding cable connector; when the diesel generator connected to the switchboard is not available, the internal bus of the switchboard is connected to its corresponding cable connector, and the other connector of the cable is also connected to the internal bus of the switchboard.

Technical Field

The invention relates to the technical field of nuclear power, in particular to an emergency power supply device for a nuclear power plant.

Background

In the nuclear power field, a generator set comprises two diesel generator sets, wherein one diesel generator set is used as a working unit, and the other diesel generator set is used as a standby unit. Each diesel generating set is connected with a switchboard, one diesel generating set works normally, and the other adjacent diesel generating set is used as a standby power supply. The corresponding specific execution flow is as follows: when a diesel generator set corresponding to one of two adjacent distribution boards fails to supply power, the power-off distribution board cabinet needs to be opened by taking a key from a long-term key cabinet, a movable switch in the power-off distribution board cabinet is pushed in, a safety baffle of a trolley switch of the power-off distribution board is opened by the key, the power-off distribution board is connected, the standby distribution board is subjected to load reduction operation on the standby unit, the standby unit is transited to a safety backup state, a power feed switch contactor is pulled out, a wire inlet breaker is pulled out from a power supply trolley switch and is inserted into a wire inlet trolley switch of the power-off distribution board, the power-off distribution board is electrified again, the power-off distribution board is reconnected according to the rule load cut-off of the fault unit, and finally the power supply of the non-adjacent unit is successful.

However, in the above scheme, it is necessary to ensure that the diesel generator set, the switchboard and the related auxiliary devices of the adjacent unit to be selected are all available. However, because the geographical positions of adjacent units are relatively close, the design, elevation and equipment configuration of the plant are the same under common conditions, and when the extreme conditions of the sporadic ultra-large-scale earthquake superposition tsunami, such as nuclear accidents of the nuclear power station in fukushima, are met, the adjacent units cannot be used, so that certain limitations exist.

Disclosure of Invention

In order to solve the technical problems, the invention provides the emergency power supply device for the nuclear power plant, which improves the reliability of power supply, reduces the design cost and controls the operation difficulty.

The invention provides an emergency power supply device for a nuclear power plant, which comprises a plurality of switchboards and a plurality of cables with connectors, wherein the switchboards are arranged on the same side of a power supply box; the power distribution board comprises a plurality of power distribution boards, wherein the input end of each power distribution board is connected with a diesel generator set, a bolt hole for connecting a cable is formed in an internal bus of each power distribution board, one cable is laid between every two power distribution boards in the plurality of power distribution boards, and the joint of each cable corresponds to the position of the bolt hole in the internal bus of each power distribution board.

Preferably, the distribution board further comprises a plurality of cable containing boxes, and the bus bar led out from the interior of each distribution board is partially contained in the corresponding containing box.

Preferably, the plurality of switchboards are arranged in parallel, one accommodating box is arranged beside each switchboard, and a part of the bus led out from the inside of each switchboard is accommodated in the accommodating box corresponding to the switchboard.

Preferably, the cable is one of a single-core copper-core cable and a single-core aluminum-core cable.

Preferably, the area range of the cross section of the middle copper core of the single-core copper core cable is 400-500 mm²The area range of the aluminum core cross section of the single-core aluminum core cable is 600-650 mm²。

Preferably, when the diesel generator set connected to the switchboard is available, then the internal bus-bar of the switchboard is disconnected from its corresponding cable connector; when the diesel generator connected to the switchboard is not available, the internal bus of the switchboard is connected to its corresponding cable connector, and the other connector of the cable is also connected to the internal bus of the switchboard.

The implementation of the invention has the following beneficial effects: the invention can realize the power supply switching between the switchboards of two adjacent or nonadjacent diesel generator sets only by adding a plurality of cables, can avoid the situation that the two adjacent diesel generator sets can not supply power due to extreme natural disasters, improves the reliability of the emergency power supply device, can realize the power supply switching only by connecting the cables between the switchboards of the two diesel generator sets, does not need to additionally add more complex key locking logic, reduces the design cost and controls the operation difficulty.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.

Fig. 1 is a schematic diagram of an emergency power supply device for a nuclear power plant provided by the invention.

Detailed Description

The invention provides an emergency power supply device for a nuclear power plant, which comprises a plurality of distribution boards and a plurality of cables with joints, wherein the distribution boards are arranged on the distribution boards; the input end of each switchboard is connected with a diesel generator set, a bolt hole for connecting cables is arranged on an internal bus of each switchboard, a cable is laid between every two switchboards in the switchboards, and the joint of the cable corresponds to the position of the bolt hole on the internal bus of the switchboard.

The nuclear power plant emergency power supply device further comprises a plurality of cable containing boxes, and a part of bus led out from the interior of each switchboard is contained in the corresponding containing box.

A plurality of switchboards are arranged in parallel, a containing box corresponds to one side of each switchboard, and a part of a bus led out from the inside of each switchboard is contained in the containing box corresponding to the switchboard.

The cable is one of a single-core copper core cable and a single-core aluminum core cable.

The area range of the middle copper core cross section of the single-core copper core cable is 400-500 mm²The area range of the aluminum core cross section of the single-core aluminum core cable is 600-650 mm²。

When the diesel generator set connected with the switchboard is available, the internal bus of the switchboard is disconnected with the corresponding cable joint; when the diesel generator connected to the switchboard is not available, the internal bus of the switchboard is connected to its corresponding cable connector, and the other connector of the cable is also connected to the internal bus of the switchboard.

The power supply mode of the diesel generator set between non-adjacent sets is illustrated by taking a Ling-Auao second-stage diesel generator set to replace a Dayawan diesel generator set as an example. Normally, all systems and equipment remain in the existing state and operating mode. When the emergency diesel generator set of the Bay unit in the great Asia is unavailable, LG is unavailable and the fifth diesel engine is unavailable, the back doors of a D9LHT003AR switchboard cabinet and an L8LHT003AR switchboard cabinet are respectively opened, cable joints between the two switchboard cabinets are respectively connected to the busbar, then a breaker of a D9LHT003AR switchboard is pushed into the first interval, a breaker of an L8LHT003AR switchboard is pushed into the second interval, the breaker between the D9LHT003AR and the D1LHA and the breaker between the L8LHT003AR and the L3LHA are closed, the condition that the D1LHP is replaced by the L3LHQ is provided, the L3LHQ diesel engine is started, and the 002 breaker JA between the L3LHB is closed according to a program, so that the emergency diesel generator set of the non-adjacent unit can replace the emergency diesel generator set of the fault unit.

The cable type can be selected according to the current-carrying capacity of the cable in operation. Taking the data in the second stage of the ridge and Australia with the most severe operating condition as an example for model selection calculation:

the rated apparent power is 69660 kVA, the rated voltage is 6.6kV, the rated current is 609A, and the maximum value of 1.1 times of overload current is as follows:

the correction coefficient of the current-carrying capacity of a single-layer parallel cable arranged on a cable bridge without a gap is calculated by taking a conservative value of 0.7, so that the current-carrying capacity of the cable is required to be as follows:

according to the requirements related to cable type selection, the selectable range of the K3 safety-class cable with the current-carrying capacity of more than 957A and 6.6kV is 400mm of two single cores²Copper core, 500mm²Copper core, 630mm²An aluminum core. The voltage drop after two parallels is 0.11V/A.km, 0.08V/A.km and 0.09V/A.km respectively. The maximum distance of the cable is a ridge and Australian second-stage outgoing line, and the distance is about 2.9 km. Under the action of 1.1 times of overload current, the voltage drop is respectively as follows:

two single cores 400mm2 copper cores: Δ U is 0.11 × 2.9 × 670 is 213.73V;

two single cores 500mm2 copper cores: Δ U is 0.08 × 2.9 × 670 is 155.44V;

two single core 630mm2 aluminum cores: Δ U is 0.09 × 2.9 × 670 is 174.87V;

the voltage of the emergency switchboard behind the cables with three specifications is 6716.27V, 6774.56V and 6755.13V respectively if the outlet voltage of the generator is 1.05UN, namely 6.93kV, and the voltage deviation meets the requirement that the voltage is within the range of +/-7% of the rated voltage. Considering the importance and the economy of the loop, two single cores of 400mm are selected for each phase of each loop²Copper core cable.

The emergency power supply device provided by the invention can realize reliable emergency power supply of a nuclear power plant under the interference of an ultra-large-scale natural disaster, and simultaneously avoids the influence on the state and the operation mode of the existing equipment.

The invention takes the distribution board as a hub, and is matched with a key locking and line interconnection mode, thereby improving the power supply reliability and the capability of the nuclear power plant for coping with external extreme natural disasters, ensuring the power supply of related safety facilities, realizing the removal of reactor core waste heat and realizing the cold shutdown of the reactor, further improving the safety of the nuclear power plant unit, not increasing a diesel engine, and reducing the design cost.

The invention executes power supply switching on the basis of the original key locking logic of mutual replacement of adjacent units, so that mutual replacement of adjacent diesel generator sets is not realized, more complex key locking logic is not introduced, and the operation difficulty of the system is controlled.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all should be considered as belonging to the protection scope of the invention.