Power plant unit emergency security power supply system

Abstract

The utility model discloses a power plant unit emergency security power supply system, comprising a first 9F unit which adopts a 9F unit black-start diesel generator as an emergency security power supply, and is provided with a dry-type transformer which is transformed into 380V and is connected to a security section of the 9F unit; the second 9F unit is provided with an emergency diesel generating set and provides an alternating current power supply necessary for safe shutdown of the 9F unit under the accident condition; for the first 9F unit, a security power supply scheme of a black start diesel engine and a special dry-type transformer is utilized, a special line is special, the operation and maintenance workload is small, and the protection logic is simple and clear; a black-start diesel generator is used as an emergency diesel generator set of a first 9F unit for a long time, an alternating-current power supply necessary for safe shutdown of the unit under the accident condition is provided, and the black-start diesel generator set is only used for black start of the unit when the black-start diesel generator set is needed under the power grid fault emergency condition; and a diesel generator of the second 9F unit provides an alternating current power supply necessary for safe shutdown of the unit under the accident condition.

Description

Technical Field

[0001] The utility model relates to the technical field of emergency safety power supply, in particular to an emergency safety power supply system for power plant units. Background Art

[0002] As we all know, the security power supply is the power supply for the safe shutdown of the unit, the rapid startup of the unit after a fault, and the load that must be maintained in operation to prevent damage to important main and auxiliary equipment when a power outage occurs in the entire plant. After the normal power supply of the power plant unit security load is lost, it will directly endanger the safety of the unit, and even cause permanent damage, resulting in huge economic losses. In order to avoid such accidents, it is usually centrally powered by a specially set security section. However, when the existing units are in use, the operation and maintenance workload is large, and the protection logic is not simple and clear enough. Therefore, we propose an emergency security power supply system for power plant units to solve the above-mentioned problems. Utility Model Content

[0003] The utility model aims to provide an emergency safety power supply system for power plant units to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] An emergency safety power supply system for a power plant unit, comprising:

[0006] The first 9F unit uses a black start diesel generator as the emergency safety power supply, and a 1250kVA dry-type transformer is installed to transform the voltage to 380V and connect to the safety section of the 9F unit;

[0007] The second 9F unit is equipped with an emergency diesel generator set to provide the AC power necessary for the safe shutdown of the 9F unit in the event of an accident.

[0008] As a further solution of the utility model: the black-start diesel generator serves as the emergency diesel generator set of the first 9F unit for a long time, providing the AC power supply necessary for the safe shutdown of the unit in the event of an accident, and is used as the black-start of the 9F unit only when a black-start generator set is needed in an emergency situation of a power grid failure.

[0009] As a further solution of the utility model: the first 9F unit and the second 9F unit are both provided with a quick-start diesel engine.

[0010] As a further solution of the utility model: a circuit breaker switch cabinet is additionally arranged on the quick-start diesel engine busbar, which is connected to the dry-type transformer in the power distribution room of the first 9F unit safety section through a cable.

[0011] As a further solution of the utility model: both the first 9F unit and the second 9F unit are provided with a section of AC emergency busbar.

[0012] As a further solution of the utility model: each section of the AC emergency busbar has a total of 3 power inlets, 2 of which come from the low-voltage working power center and the other comes from the diesel generator set.

[0013] As a further solution of the utility model: the emergency diesel generator set of the second 9F unit is 1000kW.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] For the emergency security power supply system of the power plant unit, for the first 9F unit, the security power supply scheme of using the black start diesel engine + special dry-type transformer is adopted, with dedicated lines for dedicated use, small operation and maintenance workload, and simple and clear protection logic; the black start diesel generator is used as the emergency diesel generator set of the first 9F unit for a long time to provide the AC power necessary for the safe shutdown of the unit in case of accidents, and it is only used as the black start of the 9F unit when the black start generator set is needed in case of an emergency power grid failure; the second 9F unit is provided with a 1000kW emergency diesel generator set to provide the AC power necessary for the safe shutdown of the unit in case of accidents. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the emergency security power supply system of the power plant unit in the utility model. Detailed Embodiment

[0017] In one embodiment, as Figure 1 shown, an emergency security power supply system for a power plant unit includes:

[0018] The first 9F unit, which uses a black start diesel generator as the emergency security power supply, and is provided with a 1250kVA dry-type transformer to step down 380V and connect it to the security section of the 9F unit;

[0019] The second 9F unit is equipped with an emergency diesel generator set to provide the AC power necessary for the safe shutdown of the 9F unit in case of an accident; the emergency diesel generator set of the second 9F unit is 1000kW, 380V, and is used for power supply to the accident security section; the black start diesel generator has long served as the emergency diesel generator set of the first 9F unit to provide the AC power necessary for the safe shutdown of the unit in case of an accident, and is only used as the black start of the 9F unit when a black start generator set is needed in case of an emergency power grid failure; both the first 9F unit and the second 9F unit are equipped with a fast start diesel engine; a circuit breaker switchgear is additionally installed on the busbar of the fast start diesel engine of the first 9F unit and is connected to the dry-type transformer in the security section distribution room of the first 9F unit through a cable.

[0020] Specifically, the black start diesel engine of the 9F unit is used as the emergency diesel generator set of the first 9F unit to provide the AC power necessary for the safe shutdown of the unit in case of an accident, and is only used as the black start of the 9F unit when a black start generator set is needed in case of an emergency power grid failure; for the first 9F unit, the security power supply scheme of using a black start diesel engine + a dedicated dry-type transformer is dedicated for a specific line, with less operation and maintenance workload and simple and clear protection logic; the black start diesel generator is used as the emergency diesel generator set of the first 9F unit for a long time to provide the AC power necessary for the safe shutdown of the unit in case of an accident, and is only used as the black start of the 9F unit when a black start generator set is needed in case of an emergency power grid failure; the second 9F unit is equipped with a 1000kW emergency diesel generator set to provide the AC power necessary for the safe shutdown of the unit in case of an accident.

[0021] In one embodiment, as Figure 1 shown, both the first 9F unit and the second 9F unit are equipped with an AC security busbar section; each section of the AC security busbar section has a total of 3 power inlets, 2 from the low-voltage working power center, and the other from the diesel generator set; the AC security busbar section is normally powered by the unit working power center. After the normal power supply is lost, the emergency diesel generator set is automatically started after a time delay confirmation. When the speed and voltage of the diesel generator set reach the rated value, the outlet switch of the diesel generator set automatically closes and the AC security busbar section is energized. The security loads are sequentially connected to ensure that the frequency and voltage of the diesel generator set are maintained within the allowable range.

[0022] The above embodiments disclose an emergency security power supply system for a power plant unit. For the first 9F unit, a security power supply scheme of using a black start diesel engine + a dedicated dry-type transformer is adopted, which is dedicated for a special line, with less operation and maintenance workload and simple and clear protection logic. The black start diesel generator is used as the emergency diesel generator set for the first 9F unit for a long time to provide the AC power necessary for the unit to safely shut down in case of an accident, and it is only used as the black start for the 9F unit when a black start generator set is needed in case of an emergency power grid failure. A 1000kW emergency diesel generator set is set for the second 9F unit to provide the AC power necessary for the unit to safely shut down in case of an accident. The AC security bus section is normally powered by the unit working power center. After the normal power supply is lost, the emergency diesel generator set is automatically started after a delay confirmation. When the speed and voltage of the diesel generator set reach the rated value, the outlet switch of the diesel generator set automatically closes, and the AC security bus section is energized. The security loads are sequentially put into operation to ensure that the frequency and voltage of the diesel generator set are kept within the allowable range.

[0023] The above is only the preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. An emergency security power supply system for a power plant unit, characterized in that, Including: The first 9F unit, which uses the black start diesel generator of the 9F unit as the emergency security power supply, and sets a 1250 kVA dry-type transformer to step down the voltage to 380V and connect it to the security section of the 9F unit; The second 9F unit, which sets an emergency diesel generator set to provide the AC power necessary for the safe shutdown of the 9F unit in case of an accident; The black start diesel generator serves as the emergency diesel generator set of the first 9F unit for a long time, providing the AC power necessary for the safe shutdown of the unit in case of an accident, and is only used as the black start of the 9F unit when a black start generator set is needed in case of an emergency power grid failure; Both the first 9F unit and the second 9F unit are provided with a fast-start diesel engine; A circuit breaker switch cabinet is additionally installed on the busbar of the fast-start diesel engine and is connected to the dry-type transformer in the distribution room of the security section of the first 9F unit through a cable; Both the first 9F unit and the second 9F unit are provided with an AC security bus section; Each section of the AC security bus section has a total of 3 power inlets, 2 from the low-voltage working power center, and the other from the diesel generator set; The emergency diesel generator set of the second 9F unit is 1000 kW.

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