Rapid switching system for connecting power supply to electric power distribution network

Abstract

The utility model discloses a quick switching system for connecting a power supply to an electric power distribution network, and relates to the technical field of electric power equipment, and the quick switching system comprises a first power supply branch, a second power supply branch, a first branch switch, a second branch switch, a first incoming line bus, a second incoming line bus, a bus tie switch and a quick power supply switching device. The first branch switch is arranged on the first power supply branch, the second branch switch is arranged on the second power supply branch, the first power supply branch is connected with the first incoming bus, the second power supply branch is connected with the second incoming bus, and two ends of the bus tie switch are respectively connected with the first incoming bus and the second incoming bus. The power supply rapid switching device is respectively connected with the first power supply branch, the second power supply branch, the first incoming bus, the second incoming bus, the first branch switch, the second branch switch and the bus tie switch. According to the invention, the bidirectional switching function of the three switches can be realized only through one power supply rapid switching device, and the power supply branch switching of two sections of buses is completed.

Description

Technical Field

[0001] The present application relates to the technical field of power equipment, and in particular to a fast switching system for accessing a power supply to a power distribution network. Background Art

[0002] As the power supply requirements of steel, petrochemical and other enterprises are getting higher and higher, the application of power supply fast switching devices in these occasions is becoming more and more extensive. At the same time, higher requirements are put forward for power supply fast switching devices, and it is necessary to realize the two-way switching of three switches. At present, ordinary power supply fast switching devices need to be configured with two power supply switching devices.

[0003] According to the functions of common power rapid switching devices, for single-bus segmentation applications, two power switching devices are required to ensure that the two bus sections serve as backup for each other, which is costly and complicated in wiring. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a fast switching system for power supply access to a power distribution network, which can realize the bidirectional switching function of three switches and complete the power supply branch switching of two bus sections by only one power supply fast switching device.

[0005] The present application provides a fast switching system for power supply access to a power distribution network, comprising: a first power supply branch, a second power supply branch, a first branch switch, a second branch switch, a first incoming bus, a second incoming bus, a bus tie switch and a power supply fast switching device;

[0006] The first branch switch is arranged on the first power supply branch, the second branch switch is arranged on the second power supply branch, the first power supply branch is connected to one end of the first incoming bus, the second power supply branch is connected to one end of the second incoming bus, one end of the bus tie switch is connected to the other end of the first incoming bus, the other end of the bus tie switch is connected to the other end of the second incoming bus, and the power fast switching device is respectively connected to the first power supply branch, the second power supply branch, the first incoming bus, the second incoming bus, the first branch switch, the second branch switch, and the bus tie switch;

[0007] The power supply fast switching device is used to determine whether to control the first branch switch or the second branch switch to be in the open position and whether to control the bus tie switch to be in the closed position according to the first electrical signal sent by the first power supply branch, the first circuit abnormality signal sent by the first branch switch, the second electrical signal sent by the second power supply branch, or the second circuit abnormality signal sent by the second branch switch when the bus tie switch is in the open position; the power supply fast switching device is also used to determine whether to control the first branch switch or the second branch switch to be in the open position according to the first electrical signal sent by the first power supply branch, or the second circuit abnormality signal sent by the second branch switch when the bus tie switch is in the closed position.

[0008] According to the fast switching system for accessing the power distribution network of the embodiment of the present application, there are at least the following beneficial effects: the power fast switching device is used to determine whether to control the first branch switch or the second branch switch to be in the open position and whether to control the bus tie switch to be in the closed position according to the first electrical signal sent by the first power supply branch, or the first circuit abnormality signal sent by the first branch switch, or the second electrical signal sent by the second power supply branch, or the second circuit abnormality signal sent by the second branch switch when the bus tie switch is in the open position; the power fast switching device is also used to determine whether to control the first branch switch or the second branch switch to be in the open position according to the first electrical signal sent by the first power supply branch, or the second circuit abnormality signal sent by the second branch switch when the bus tie switch is in the closed position. Through this setting, the present application can realize the bidirectional switching function of three switches and complete the power supply branch switching of two sections of the bus only through one power fast switching device.

[0009] According to some embodiments of the present application, the fast switching system for accessing the power supply to the power distribution network also includes a first connecting line and a second connecting line, the first electrical signal includes a first circuit voltage signal and a first circuit current signal, both ends of the first connecting line and the second connecting line are respectively connected to the first power supply branch and the power supply fast switching device, the first connecting line is used to send the first circuit voltage signal sent by the first power supply branch to the power supply fast switching device, and the second connecting line is used to send the first circuit current signal sent by the first power supply branch to the power supply fast switching device.

[0010] According to some embodiments of the present application, the fast switching system for accessing the power supply to the power distribution network also includes a third connecting line and a fourth connecting line, the second electrical signal includes a second circuit voltage signal and a second circuit current signal, and both ends of the third connecting line and the fourth connecting line are respectively connected to the second power supply branch and the power supply fast switching device, the third connecting line is used to send the second circuit voltage signal sent by the second power supply branch to the power supply fast switching device, and the fourth connecting line is used to send the second circuit current signal sent by the second power supply branch to the power supply fast switching device.

[0011] According to some embodiments of the present application, the fast switching system for accessing the power supply to the power distribution network also includes a fifth connecting line, wherein both ends of the fifth connecting line are respectively connected to the first branch switch and the power supply fast switching device, and the fifth connecting line is used to send the first circuit abnormality signal sent by the first branch switch to the power supply fast switching device, and the fifth connecting line is also used to send the signal sent by the power supply fast switching device to control whether the first branch switch is in a split position to the first branch switch.

[0012] According to some embodiments of the present application, the fast switching system for accessing the power supply to the power distribution network also includes a sixth connecting line, wherein both ends of the sixth connecting line are respectively connected to the second branch switch and the power supply fast switching device, and the sixth connecting line is used to send the second circuit abnormality signal sent by the second branch switch to the power supply fast switching device, and the sixth connecting line is also used to send the signal sent by the power supply fast switching device to control whether the second branch switch is in a split position to the second branch switch.

[0013] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0015] Figure 1 A schematic diagram of the structure of a fast switching system for connecting a power source to a power distribution network when a bus tie switch is in an open position provided in an embodiment of the present application;

[0016] Figure 2 A schematic structural diagram of a fast switching system for accessing a power source to an electric power distribution network when a bus tie switch is in a closed position provided in an embodiment of the present application.

[0017] Reference numerals:

[0018] A first power supply branch 110, a first branch switch 111, a first incoming bus 112, a first connecting line 113, a second connecting line 114, and a fifth connecting line 115;

[0019] A second power supply branch 120, a second branch switch 121, a second incoming bus 122, a third connecting line 123, a fourth connecting line 124, and a sixth connecting line 125;

[0020] Power source fast switching device 130 and bus tie switch 131. DETAILED DESCRIPTION

[0021] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0022] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0023] In the description of this application, if there is a description of first or second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0024] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0025] As the power supply requirements of steel, petrochemical and other enterprises are getting higher and higher, the application of power supply fast switching devices in these occasions is becoming more and more extensive. At the same time, higher requirements are put forward for power supply fast switching devices, and it is necessary to realize the two-way switching of three switches. At present, ordinary power supply fast switching devices need to be configured with two power supply switching devices.

[0026] According to the functions of common power rapid switching devices, for single-bus segmentation applications, two power switching devices are required to ensure that the two bus sections serve as backup for each other, which is costly and complicated in wiring.

[0027] In order to solve the above-mentioned problems, the present application proposes a fast switching system for accessing a power source to an electric power distribution network. The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0028] Reference Figure 1 to Figure 2 The present application provides a fast switching system for accessing a power distribution network, comprising: a first power supply branch 110, a second power supply branch 120, a first branch switch 111, a second branch switch 121, a first incoming bus 112, a second incoming bus 122, a bus tie switch 131 and a power fast switching device 130; the first branch switch 111 is arranged on the first power supply branch 110, the second branch switch 121 is arranged on the second power supply branch 120, the first power supply branch 110 is connected to one end of the first incoming bus 112, the second power supply branch 120 is connected to one end of the second incoming bus 122, one end of the bus tie switch 131 is connected to the other end of the first incoming bus 112, the other end of the bus tie switch 131 is connected to the other end of the second incoming bus 122, and the power fast switching device 130 is respectively connected to the first power supply branch 110, the second power supply branch 120, the first incoming bus The first branch switch 111, the second branch switch 121, and the bus tie switch 131 are connected; the power supply fast switching device 130 is used to determine whether to control the first branch switch 111 or the second branch switch 121 to be in the open position and whether to control the bus tie switch 131 to be in the closed position according to the first electrical signal sent by the first power supply branch 110, the first circuit abnormality signal sent by the first branch switch 111, the second electrical signal sent by the second power supply branch 120, or the second circuit abnormality signal sent by the second branch switch 121 when the bus tie switch 131 is in the open position; the power supply fast switching device 130 is also used to determine whether to control the first branch switch 111 or the second branch switch 121 to be in the open position according to the first electrical signal sent by the first power supply branch 110, or the second circuit abnormality signal sent by the second branch switch 121 when the bus tie switch 131 is in the closed position.

[0029] It should be noted that Figure 1It is a fast switching system of a sectionalized switch, that is, the first incoming bus 112 and the second incoming bus 122 are powered by their own power supply branches, the first branch switch 111 and the second branch switch 121 are both closed, and the bus tie switch 131 is in an open state. When any of the first power supply branch 110 and the second power supply branch 120 fails, the power supply fast switching device 130 trips the first branch switch 111 (or the second branch switch 121) and closes the bus tie switch 131 according to the fault situation, and the first incoming bus 112 and the second incoming bus 122 are powered by the fault-free second power supply branch 120 (or the first power supply branch 110), ensuring that the first incoming bus 112 and the second incoming bus 122 do not lose power, and the first branch switch 111 (or the second branch switch 121) and the bus tie switch 131 can also be manually controlled to switch the power supply branches.

[0030] Figure 2 It is a fast switching of the incoming line switch, that is, the bus tie switch 131 is always in the closed position, and the switching is performed bidirectionally between the first branch switch 111 and the second branch switch 121. When the first power supply branch 110 (or the second power supply branch 120) fails, the power supply fast switching device 130 will trip the first branch switch 111 (or the second branch switch 121) according to the fault situation, and close the standby second power supply branch 120 (or the first power supply branch 110), so that the first incoming line bus 112 and the second incoming line bus 122 are both powered by the fault-free power supply branch, ensuring that the two sections of the bus do not lose power. The first branch switch 111 and the second branch switch 121 can also be manually controlled to switch the power supply branch.

[0031] It should be noted that the fast switching condition is: after the start-up switching, the frequency difference between the voltage of the first incoming bus 112 and the target branch voltage is less than the "fast switching frequency difference" setting, and the phase difference is less than the "fast switching phase difference" setting. The forward phase angle switching condition is: the phase difference between the voltage of the first incoming bus 112 and the target branch voltage is equal to the "same capture forward phase angle" setting, and the frequency difference between the voltage of the first incoming bus 112 and the target branch voltage is less than the "same capture allowable frequency difference" setting. The forward phase angle switching condition is satisfied.

[0032] The Echizen time switching condition is: based on the frequency difference and phase difference between the current voltage of the first incoming bus 112 and the target branch voltage, the phase difference between the voltage of the first incoming bus 112 and the target branch voltage after the delay set by the "**switch Echizen time" constant is calculated in real time. The Echizen time switching condition is met when the phase difference is zero and the frequency difference between the voltage of the first incoming bus 112 and the target branch voltage is less than the "same capture allowable frequency difference" constant.

[0033] The residual voltage switching condition is: when the voltage amplitude of the first incoming bus 112 is lower than the "residual voltage switching amplitude" set value, the residual voltage switching condition is met.

[0034] The long delay switching condition is: within the delay set by the "long delay time" setting value, if the above four switching conditions are not met, the long delay switching condition will be met after the delay ends. The switching mode and judgment conditions are shown in the following table:

[0035]

[0036] 1) Series switching

[0037] The protection outlet reflecting the fault of the first power supply branch 110 is started, and a command to trip the first branch switch 111 is issued. When the first branch switch 111 is tripped and the switching conditions are met, the bus tie switch 131 is closed. The switching conditions include: fast switching, Echizen phase angle switching, Echizen time switching, residual voltage switching, and long delay switching. If the fast switching fails, it will automatically switch to Echizen phase angle switching, Echizen time switching, residual voltage switching, and long delay switching.

[0038] 2) Switch simultaneously

[0039] The protection outlet reflecting the fault of the first power supply branch 110 is started, and a command to trip the first branch switch 111 is issued. After the setting value of "simultaneous switching closing delay", no matter whether the first branch switch 111 is tripped or not, a command to close the bus tie switch 131 is issued when the switching conditions are met. The switching conditions include: fast switching, Echizen phase angle switching, Echizen time switching, residual voltage switching, and long delay switching. If the fast switching fails, it will automatically switch to Echizen phase angle switching, Echizen time switching, residual voltage switching, and long delay switching.

[0040] In the present application, the power supply fast switching device 130 is used to determine whether to control the first branch switch 111 or the second branch switch 121 to be in the open position and whether to control the bus tie switch 131 to be in the closed position according to the first electrical signal sent by the first power supply branch 110, or the first circuit abnormality signal sent by the first branch switch 111, or the second electrical signal sent by the second power supply branch 120, or the second circuit abnormality signal sent by the second branch switch 121 when the bus tie switch 131 is in the open position; the power supply fast switching device 130 is also used to determine whether to control the first branch switch 111 or the second branch switch 121 to be in the open position according to the first electrical signal sent by the first power supply branch 110, or the second circuit abnormality signal sent by the second branch switch 121 when the bus tie switch 131 is in the closed position. Through this setting, the present application can realize the bidirectional switching function of three switches and complete the power supply branch switching of two sections of the bus only through one power supply fast switching device 130.

[0041] Reference Figure 1 to Figure 2 It can be understood that the fast switching system for connecting the power supply to the power distribution network also includes a first connecting line 113 and a second connecting line 114, the first electrical signal includes a first circuit voltage signal and a first circuit current signal, both ends of the first connecting line 113 and the second connecting line 114 are respectively connected to the first power supply branch 110 and the power supply fast switching device 130, the first connecting line 113 is used to send the first circuit voltage signal sent by the first power supply branch 110 to the power supply fast switching device 130, and the second connecting line 114 is used to send the first circuit current signal sent by the first power supply branch 110 to the power supply fast switching device 130.

[0042] It should be noted that Figure 1 In the process, when the first power supply branch 110 fails, there is an abnormality in the first circuit voltage signal and / or the first circuit current signal sent by the first power supply branch 110 to the power supply fast switching device 130. The power supply fast switching device 130 opens the first branch switch 111 and closes the bus tie switch 131 according to the abnormality of the first circuit voltage signal and / or the first circuit current signal. The first incoming bus 112 and the second incoming bus 122 are both powered by the fault-free second power supply branch 120. Figure 2 In the process, when the first power supply branch 110 fails, there is an abnormality in the first circuit voltage signal and / or the first circuit current signal sent by the first power supply branch 110 to the power supply fast switching device 130. The power supply fast switching device 130 opens the first branch switch 111 and closes the standby second power supply branch 120 according to the abnormality of the first circuit voltage signal and / or the first circuit current signal, so that the first incoming bus 112 and the second incoming bus 122 are both powered by the fault-free power supply branch.

[0043] Reference Figure 1 to Figure 2 It can be understood that the fast switching system for connecting the power supply to the power distribution network also includes a third connecting line 123 and a fourth connecting line 124, the second electrical signal includes a second circuit voltage signal and a second circuit current signal, and both ends of the third connecting line 123 and the fourth connecting line 124 are respectively connected to the second power supply branch 120 and the power supply fast switching device 130, the third connecting line 123 is used to send the second circuit voltage signal sent by the second power supply branch 120 to the power supply fast switching device 130, and the fourth connecting line 124 is used to send the second circuit current signal sent by the second power supply branch 120 to the power supply fast switching device 130.

[0044] It should be noted that Figure 1In the process, when the second power supply branch 120 fails, there is an abnormality in the second circuit voltage signal and / or the second circuit current signal sent by the second power supply branch 120 to the power supply fast switching device 130. The power supply fast switching device 130 opens the second branch switch 121 and closes the bus tie switch 131 according to the abnormality of the second circuit voltage signal and / or the second circuit current signal. The first incoming bus 112 and the second incoming bus 122 are both powered by the first power supply branch 110 without fault. Figure 2 In the process, when the second power supply branch 120 fails, there is an abnormality in the second circuit voltage signal and / or the second circuit current signal sent by the second power supply branch 120 to the power supply fast switching device 130. The power supply fast switching device 130 opens the second branch switch 121 and closes the standby first power supply branch 110 according to the abnormality of the second circuit voltage signal and / or the second circuit current signal, so that the first incoming bus 112 and the second incoming bus 122 are both powered by the fault-free power supply branch.

[0045] Reference Figure 1 to Figure 2 It can be understood that the fast switching system for accessing the power distribution network to the power supply also includes a fifth connecting line 115, and the two ends of the fifth connecting line 115 are respectively connected to the first branch switch 111 and the power fast switching device 130. The fifth connecting line 115 is used to send the first circuit abnormality signal sent by the first branch switch 111 to the power fast switching device 130. The fifth connecting line 115 is also used to send the signal sent by the power fast switching device 130 to control whether the first branch switch 111 is in the open position to the first branch switch 111.

[0046] Reference Figure 1 to Figure 2 It can be understood that the fast switching system for accessing the power distribution network to the power supply also includes a sixth connecting line 125, and the two ends of the sixth connecting line 125 are respectively connected to the second branch switch 121 and the power fast switching device 130. The sixth connecting line 125 is used to send the second circuit abnormality signal sent by the second branch switch 121 to the power fast switching device 130. The sixth connecting line 125 is also used to send the signal sent by the power fast switching device 130 to control whether the second branch switch 121 is in the open position to the second branch switch 121.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0048] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

[0049] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A fast switching system for connecting a power source to a power distribution network, characterized in that: include: A first power supply branch, a second power supply branch, a first branch switch, a second branch switch, a first incoming bus, a second incoming bus, a bus tie switch and a power supply fast switching device; The first branch switch is arranged on the first power supply branch, the second branch switch is arranged on the second power supply branch, the first power supply branch is connected to one end of the first incoming bus, the second power supply branch is connected to one end of the second incoming bus, one end of the bus tie switch is connected to the other end of the first incoming bus, the other end of the bus tie switch is connected to the other end of the second incoming bus, and the power fast switching device is respectively connected to the first power supply branch, the second power supply branch, the first incoming bus, the second incoming bus, the first branch switch, the second branch switch, and the bus tie switch; The power supply fast switching device is used to determine whether to control the first branch switch or the second branch switch to be in the open position and whether to control the bus tie switch to be in the closed position according to the first electrical signal sent by the first power supply branch, the first circuit abnormality signal sent by the first branch switch, the second electrical signal sent by the second power supply branch, or the second circuit abnormality signal sent by the second branch switch when the bus tie switch is in the open position; the power supply fast switching device is also used to determine whether to control the first branch switch or the second branch switch to be in the open position according to the first electrical signal sent by the first power supply branch, or the second circuit abnormality signal sent by the second branch switch when the bus tie switch is in the closed position.

2. The fast switching system for accessing a power distribution network to a power source according to claim 1, characterized in that: The fast switching system for accessing the power supply to the power distribution network also includes a first connecting line and a second connecting line. The first electrical signal includes a first circuit voltage signal and a first circuit current signal. Both ends of the first connecting line and the second connecting line are respectively connected to the first power supply branch and the power supply fast switching device. The first connecting line is used to send the first circuit voltage signal sent by the first power supply branch to the power supply fast switching device, and the second connecting line is used to send the first circuit current signal sent by the first power supply branch to the power supply fast switching device.

3. The fast switching system for accessing a power distribution network to a power source according to claim 1, characterized in that: The fast switching system for accessing the power supply to the power distribution network also includes a third connecting line and a fourth connecting line. The second electrical signal includes a second circuit voltage signal and a second circuit current signal. Both ends of the third connecting line and the fourth connecting line are respectively connected to the second power supply branch and the power supply fast switching device. The third connecting line is used to send the second circuit voltage signal sent by the second power supply branch to the power supply fast switching device, and the fourth connecting line is used to send the second circuit current signal sent by the second power supply branch to the power supply fast switching device.

4. The fast switching system for accessing a power distribution network to a power source according to claim 1, characterized in that: The fast switching system for accessing the power supply to the power distribution network also includes a fifth connecting line, the two ends of which are respectively connected to the first branch switch and the power supply fast switching device, the fifth connecting line is used to send the first circuit abnormality signal sent by the first branch switch to the power supply fast switching device, and the fifth connecting line is also used to send the signal sent by the power supply fast switching device to control whether the first branch switch is in the open position to the first branch switch.

5. The fast switching system for accessing a power distribution network to a power source according to claim 1, characterized in that: The fast switching system for accessing the power supply to the power distribution network also includes a sixth connecting line, the two ends of which are respectively connected to the second branch switch and the power supply fast switching device, the sixth connecting line is used to send the second circuit abnormality signal sent by the second branch switch to the power supply fast switching device, and the sixth connecting line is also used to send the signal sent by the power supply fast switching device to control whether the second branch switch is in the open position to the second branch switch.

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