A temporary power supply device for low-voltage switch cabinet of nuclear power plant

Abstract

This utility model belongs to the field of low-voltage power distribution technology, specifically relating to a temporary power supply device for low-voltage switchgear in nuclear power plants. The device includes a power supply drawer, a distribution drawer, and a temporary power supply cable. The power supply drawer is located in the power supply switchgear, and the distribution drawer is located in the power outage switchgear. Both the power supply drawer and the distribution drawer are equipped with space plugs. The temporary power supply cable connects the space plugs of the power supply drawer and the distribution drawer, and the power supply drawer supplies power to the distribution drawer through the temporary power supply cable. This device has low operational risk, eliminating the need for maintenance personnel to disconnect or reconnect cables in the energized cable compartment of the switchgear, thus eliminating the risk of electric shock. Users only need to perform simple switchgear drawer operations and cable connector connections to achieve temporary power supply to the load.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage power distribution technology, specifically relating to a temporary power supply device for low-voltage switchgear in nuclear power plants. Background Technology

[0002] The low- and medium-voltage switchgear in nuclear power plants is withdrawable switchgear. During major overhauls of nuclear power units, the switchgear will be shut down for maintenance. Due to limitations imposed by the unit's operating conditions or on-site maintenance requirements, some loads on the switchgear cannot be de-energized for extended periods, thus requiring temporary power supply to these loads.

[0003] In existing technologies, temporary power supply is implemented by locating a suitable spare power supply drawer in the operating switchgear, laying a temporary cable between the spare power supply drawer and the load distribution drawer requiring power, removing the outgoing cable of the load requiring power from the switchgear cable compartment, terminating one end of the removed outgoing cable with the temporarily laid cable, and then connecting the other end of the temporary cable to the outgoing terminal of the spare power supply drawer. This method has a high implementation risk. During cable termination, workers need to enter the switchgear cable compartment, posing a risk of accidentally touching live parts. For temporary power supply of some high-power loads, the temporary cables are large, making cable disconnection and connection difficult. Furthermore, temporary power supply has limitations. Currently implemented temporary power supply only restores power to the power source; the control system cannot be implemented, and the power supply cannot be controlled. This means that restoring power to motor-type equipment can only be done by operators using test boxes on-site according to actual site requirements. Current temporary power supply methods require operators to disconnect and isolate the load before implementation, and also require disconnection and isolation when temporary power is restored, which will cause the temporary power supply load to lose power for a relatively long time. Utility Model Content

[0004] This utility model proposes a temporary power supply device for low-voltage switchgear in nuclear power plants, which solves the problems of high wiring risks, unusable control parts, and long power outage time in the temporary power supply of low-voltage switchgear in the prior art.

[0005] The technical solution of this utility model:

[0006] This utility model proposes a temporary power supply device for a low-voltage switchgear in a nuclear power plant. The device includes a power supply drawer, a distribution drawer, and a temporary power supply cable. The power supply drawer is installed in the power supply switchgear, and the distribution drawer is installed in the power outage switchgear. The power supply drawer and the distribution drawer are respectively equipped with aerospace plugs. The temporary power supply cable connects the aerospace plugs of the power supply drawer and the distribution drawer. The power supply drawer supplies power to the distribution drawer through the temporary power supply cable.

[0007] In some embodiments, the power supply drawer includes a power supply, a circuit breaker A, a secondary plug and an aviation plug A. The power supply is electrically connected to the circuit breaker, the secondary plug and the aviation plug in sequence. The aviation plug is located on the panel of the power supply drawer.

[0008] In some embodiments, the power supply comes from the vertical busbar of the power supply switch cabinet, and the power supply voltage is 380V.

[0009] In some embodiments, the power distribution drawer includes an aviation plug B and a circuit breaker B, which are electrically connected, and the aviation plug B is located on the panel of the power distribution drawer.

[0010] In some embodiments, the power supply drawer has an operating handle A on its panel, which controls circuit breaker A via a control circuit; the distribution drawer has an operating handle B on its panel, which controls circuit breaker B via a control circuit.

[0011] In some embodiments, circuit breaker B of the distribution drawer is connected to the load device.

[0012] In some embodiments, the temporary power supply cable includes a power cable and a DC control power cable. The power cable supplies power to the load equipment connected to the distribution drawer, and the DC control power cable supplies power to the control circuit of the operating handle B of the distribution drawer.

[0013] The beneficial effects of this utility model are:

[0014] 1. This utility model proposes a temporary power supply device for low-voltage switchgear in nuclear power plants. This device has low operational risk, eliminating the need for maintenance personnel to disconnect or reconnect cables in the energized cable compartment of the switchgear, thus eliminating the risk of electric shock. Users only need to perform simple switchgear drawer operations and cable connector connections to achieve temporary power supply to the load.

[0015] 2. This utility model proposes a temporary power supply device for low-voltage switchgear in nuclear power plants. This device has a short load power loss time. Using existing methods for temporary load power supply, from the start of operation to isolation, maintenance to temporary power supply, and then back to isolation, until the load is finally restored, it takes at least four hours. However, using this device for temporary load power supply only requires simple operation of the switchgear drawer by the operating personnel, and the temporary power supply to the load can be restored within ten minutes.

[0016] 3. This utility model proposes a temporary power supply device for low-voltage switchgear in nuclear power plants. The device uses a DC control power cable to supply power to the control circuit, retains the remote control logic of the original load, and can realize the automatic start and stop of the load. Attached Figure Description

[0017] Figure 1A schematic diagram of a temporary power supply device for a low-voltage switchgear in a nuclear power plant designed for this utility model;

[0018] Figure 2 A schematic diagram of a power supply drawer for a temporary power supply device for a low-voltage switchgear in a nuclear power plant, designed for this utility model.

[0019] Figure 3 This is a schematic diagram of the power distribution drawer of a temporary power supply device for a low-voltage switchgear in a nuclear power plant, according to the present invention.

[0020] Attached diagram descriptions: 1. Power supply; 2. Circuit breaker A; 3. Secondary connector; 4. Aviation connector A; 5. Aviation connector B; 7. Circuit breaker B; 8. Load device. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] like Figures 1 to 3 As shown, this utility model proposes a temporary power supply device for a low-voltage switchgear in a nuclear power plant. The device includes a power supply drawer, a distribution drawer, and a temporary power supply cable. The power supply drawer is installed in the power supply switchgear, which serves as a temporary power source 1 to supply power to the power outage switchgear. The distribution drawer is installed in the power outage switchgear, which is a switchgear for power outage maintenance.

[0023] The power supply drawer includes a power supply 1, a circuit breaker A2, a secondary connector 3, and an aviation connector A4. The power supply 1 is electrically connected to the circuit breaker, secondary connector 3, and aviation connector in sequence. The aviation connector is located on the panel of the power supply drawer. The power supply 1 for the drawer comes from the vertical busbar of the power supply switch cabinet, and the voltage of power supply 1 is 380V. An operating handle A is located on the panel of the power supply drawer, and the operating handle A controls the circuit breaker A2 via a control circuit.

[0024] The power distribution drawer includes an aviation plug B5 and a circuit breaker B7, which are electrically connected. The aviation plug B5 is located on the panel of the power distribution drawer, and the circuit breaker B7 is connected to the load device 8. The panel of the power distribution drawer is equipped with an operating handle B, which controls the circuit breaker B7 via a control circuit.

[0025] The temporary power supply cable includes a power cable and a DC control power cable. The power cable supplies power to the load device 8 connected to the distribution drawer, and the DC control power cable supplies power to the control circuit of the operating handle B of the distribution drawer.

[0026] This utility model proposes a temporary power supply device for low-voltage switchgear in nuclear power plants. The specific implementation of this device is as follows:

[0027] First, identify the drawer corresponding to the load requiring temporary power supply in the power outage switchgear, and the drawer for the power-receiving switchgear. Then, insert the power supply drawer into the drawer for the power-receiving switchgear, and insert the distribution drawer into the drawer corresponding to the load requiring temporary power supply in the power outage switchgear. Insert the power cable with aviation connector and the DC control power cable into the corresponding aviation connectors in these two drawers. Finally, operate the operating handle A on the power supply drawer panel to close circuit breaker A2, closing the power supply drawer. Operate the operating handle B on the distribution drawer panel to close circuit breaker B7, closing the distribution drawer. Figure 1 As shown, the temporary power supply to the load is now complete. At this point, the load can perform corresponding opening and closing operations according to external control commands. After the temporary power supply demand of the load ends, disconnect and pull out the power supply drawer and distribution drawer in sequence, disconnect the connecting cables between them, and restore the switch cabinet drawers to their initial state.

[0028] The embodiments of this utility model have been described in detail above. This utility model is not limited to the above examples. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model.

Claims

1. A temporary power supply device for a low-voltage switchgear in a nuclear power plant, characterized in that, The device includes a power supply drawer, a power distribution drawer, and a temporary power supply cable. The power supply drawer is installed in a power supply switch cabinet, and the power distribution drawer is installed in a power outage switch cabinet. The power supply drawer and the power distribution drawer are respectively equipped with aerospace plugs. The temporary power supply cable connects the aerospace plugs of the power supply drawer and the power distribution drawer. The power supply drawer supplies power to the power distribution drawer through the temporary power supply cable.

2. A temporary power supply device for a low-voltage switchgear in a nuclear power plant according to claim 1, characterized in that, The power supply drawer includes a power supply (1), a circuit breaker A (2), a secondary plug (3), and an aviation plug A (4). The power supply (1) is electrically connected to the circuit breaker A (2), the secondary plug (3), and the aviation plug A (4) in sequence. The aviation plug A (4) is located on the panel of the power supply drawer.

3. A temporary power supply device for a low-voltage switchgear in a nuclear power plant according to claim 2, characterized in that, The power supply (1) comes from the vertical busbar of the power supply switch cabinet, and the voltage of the power supply (1) is 380V.

4. A temporary power supply device for a low-voltage switchgear in a nuclear power plant according to claim 3, characterized in that, The power distribution drawer includes an aviation plug B (5) and a circuit breaker B (7), which are electrically connected. The aviation plug B (5) is located on the panel of the power distribution drawer.

5. A temporary power supply device for a low-voltage switchgear in a nuclear power plant according to claim 4, characterized in that, The power supply drawer has an operating handle A on its panel, which controls the circuit breaker A (2) via a control circuit. The distribution drawer has an operating handle B on its panel, which controls the circuit breaker B (7) via a control circuit.

6. A temporary power supply device for a low-voltage switchgear in a nuclear power plant according to claim 5, characterized in that, The circuit breaker B (7) of the power distribution drawer is connected to the load device (8).

7. A temporary power supply device for a low-voltage switchgear in a nuclear power plant according to claim 6, characterized in that, The temporary power supply cable includes a power cable and a DC control power cable. The power cable supplies power to the load equipment (8) connected to the distribution drawer, and the DC control power cable supplies power to the control circuit of the distribution drawer.

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