Power supply device and system

Abstract

The utility model discloses a power supply device and system, and relates to the field of power systems and automation thereof, the device is provided with a first circuit breaker, an electric isolation knife switch, a line grounding knife switch, a first isolation cabinet and a second circuit breaker, the electric isolation knife switch and the line grounding knife switch are controlled by a controller to be correspondingly closed and closed, and the first isolation cabinet is connected with the second circuit breaker. And when the electric isolation knife switch is closed, the line grounding knife switch is closed, otherwise, when the electric isolation knife switch is closed, the line grounding knife switch is closed, and when the electric isolation knife switch is closed, the LF furnace is electrified to work, according to the scheme, only the electric isolation knife switch and the line grounding knife switch need to be controlled in the actual maintenance process; the circuit breaker handcart corresponding to the first circuit breaker and the second circuit breaker does not need to be used, so that the transmission part of the circuit breaker handcart cannot be abraded, subsequent maintenance and operation are facilitated, and the influence on steelmaking process production is reduced.

Description

Technical Field

[0001] The utility model relates to the field of power systems and automation thereof, in particular to a power supply device and system. Background Art

[0002] With the advancement of technology, the steelmaking industry now generally adopts LF (Ladle Furnace, refining) furnaces. LF furnaces are used in the converter process to produce specialty steels. This eliminates the previous practice of distinguishing steel quality based on steelmaking methods and establishes the concept of "primary refining (electric furnace or converter) + LF refining + continuous casting" to produce a wide variety of high-quality steels. Due to its simple structure, diverse metallurgical functions, operational flexibility, significant refining effects, and high economic benefits, LF furnaces have become a key piece of equipment in the steel production process.

[0003] In the prior art, the power supply system of the LF furnace is as follows: Figure 1 As shown by Figure 1 It can be seen that, due to the needs of on-site production and maintenance, the current LF furnace power supply system has the first circuit breaker allocated from the 110kV steelmaking substation and the second circuit breaker allocated from the 35kV refining substation both installed in the corresponding isolation cabinet, and the status of the two circuit breakers needs to be changed frequently (5 to 8 times a day). In addition, because the first circuit breaker and the second circuit breaker are both installed on the circuit breaker trolley in the corresponding isolation cabinet, each maintenance needs to push the circuit breaker trolley out of the isolation cabinet and shake the rocker on the circuit breaker trolley to change the status of the two circuit breakers to the cold standby state. Because the circuit breaker trolley needs to enter and exit the isolation cabinet through its own transmission parts, and the entry and exit process is relatively difficult, so doing so can easily cause serious wear and tear on the transmission parts of the circuit breaker trolley, causing great difficulties in operation and maintenance, thereby affecting the smooth progress of the steelmaking process. Utility Model Content

[0004] The purpose of the utility model is to provide a power supply device and system. In the actual maintenance process, this solution only needs to control the electric isolation switch and the line grounding switch, and there is no need to use the circuit breaker trolleys corresponding to the first circuit breaker and the second circuit breaker. Therefore, the transmission parts of the circuit breaker trolley will not be worn, which facilitates subsequent maintenance and operation and reduces the impact on steelmaking process production.

[0005] In order to solve the above technical problems, the utility model provides a power supply device, comprising: a first circuit breaker, an electric isolation switch, a line grounding switch, a first isolation cabinet, and a second circuit breaker;

[0006] The first end of the first circuit breaker is connected to the output end of the first substation, and the second end is connected to the normally open contact of the electric isolation switch;

[0007] The normally closed contact of the electric isolation switch is connected to the first end of the first isolation cabinet;

[0008] The normally open contact of the line grounding switch is connected to the first end of the first isolation cabinet, and the normally closed contact is connected to the ground; under the control of the controller, when the electric isolation switch is closed, the line grounding switch is turned off, and when the electric isolation switch is turned off, the line grounding switch is closed;

[0009] The second end of the first isolation cabinet is connected to the input end of the second substation, so that the second substation performs a voltage reduction operation upon receiving the first voltage transmitted by the first substation to generate a corresponding second voltage;

[0010] A first end of the second circuit breaker is connected to an output end of the second transformer substation, and a second end of the second circuit breaker is connected to a preset transformer, and the preset transformer is connected to the LF furnace.

[0011] Optionally, also include:

[0012] A second isolation cabinet, wherein a first end of the second isolation cabinet is connected to the output end of the first substation, and a second end is connected to the first end of the first circuit breaker, and is used to isolate the first substation and the second substation.

[0013] Optionally, also include:

[0014] A PT cabinet, wherein the first end of the PT cabinet is respectively connected to the normally open contact of the line grounding switch and the normally closed contact of the electric isolation switch, and the second end is connected to the first end of the first isolation cabinet, and is used to detect the voltage between the first substation and the second substation.

[0015] Optionally, the PT cabinet includes: a voltage transformer, a first isolating switch, a fuse and a first lightning arrester;

[0016] The first end of the voltage transformer is respectively connected to the normally open contact of the line grounding switch and the normally closed contact of the electric isolating switch, and the second end is respectively connected to the first end of the fuse, the first end of the first lightning arrester and the first end of the first isolating switch, for detecting the voltage between the first substation and the second substation;

[0017] The second end of the first isolation switch is connected to the ground;

[0018] The second end of the first lightning arrester is connected to the ground;

[0019] The second end of the fuse is connected to the first end of the first isolation cabinet.

[0020] Optionally, it also includes: a second lightning arrester and a second isolation switch;

[0021] The first end of the second lightning arrester is connected to the second end of the first circuit breaker, and the second end is connected to the ground;

[0022] The first end of the second isolating switch is connected to the second end of the first circuit breaker, and the second end is connected to the ground.

[0023] Optionally, also include:

[0024] A filter module, wherein a first end of the filter module is connected to the second end of the first circuit breaker, and a second end of the filter module is connected to the ground.

[0025] Optionally, also include:

[0026] A protection device, wherein the first end of the protection device is respectively connected to the normally open contact of the line grounding switch and the normally closed contact of the electric isolation switch, and the second end is connected to the first end of the first isolation cabinet, and is used to disconnect when an overcurrent or overvoltage occurs in the circuit between the first substation and the second substation.

[0027] Optionally, also include:

[0028] a rectifier, wherein a first end of the rectifier is respectively connected to the normally open contact of the line grounding switch and the normally closed contact of the electric isolation switch, and a second end is connected to the first end of the alarm module, and is used to convert the first voltage into a corresponding DC voltage to power the alarm module;

[0029] An alarm module, the second end of which is connected to the first end of the first isolation cabinet, is used to issue a first alarm when the alarm module is powered on, and to issue a second alarm when the electric isolation switch is disconnected and the line grounding switch is closed.

[0030] Optionally, the normally closed contacts of the electric isolation switch are respectively connected to the first end of the first isolation cabinet, the normally open contact of the line grounding switch and the normally closed contact of the line grounding switch, and the control end of the electric isolation switch is connected to the controller, and is used to close when receiving a closing instruction transmitted by the controller, and drive the line grounding switch to open, and to open when receiving a disconnection instruction transmitted by the controller, and drive the line grounding switch to close;

[0031] The normally closed contact of the line isolation switch is connected to the ground.

[0032] To solve the above technical problems, the present invention also provides a power supply system, including: a first substation, a second substation, a preset transformer and the power supply device as described above, wherein the power supply device is respectively connected to the first substation, the second substation and the preset transformer.

[0033] The utility model provides a power supply device and system, wherein a first circuit breaker, an electric isolating knife switch, a line grounding knife switch, a first isolating cabinet, and a second circuit breaker are provided in the device, wherein the electric isolating knife switch and the line grounding knife switch are controlled by a controller to be closed and turned off accordingly, and when the electric isolating knife switch is closed, the line grounding knife switch is turned off, and conversely, when the electric isolating knife switch is turned off, the line grounding knife switch is closed, and when the electric isolating knife switch is closed, the LF furnace is powered on and works. In actual maintenance, this solution only needs to control the electric isolating knife switch and the line grounding knife switch, and does not need to use circuit breaker trolleys corresponding to the first circuit breaker and the second circuit breaker, so that the transmission parts of the circuit breaker trolley will not be worn, which is convenient for subsequent maintenance and operation, and reduces the impact on steelmaking process production. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0035] Figure 1 A schematic diagram of the structure of a power supply system in the prior art provided by the utility model;

[0036] Figure 2 A schematic structural diagram of a power supply device provided by the utility model;

[0037] Figure 3 A schematic structural diagram of an improved power supply system provided by the utility model;

[0038] Figure 4 A schematic diagram of a secondary circuit of a circuit breaker provided by the utility model;

[0039] Figure 5 This is another schematic diagram of the secondary circuit of a circuit breaker provided by the utility model. DETAILED DESCRIPTION

[0040] The core of the utility model is to provide a power supply device and system. During the actual maintenance process, this solution only needs to control the electric isolation switch and the line grounding switch. There is no need to use the circuit breaker trolleys corresponding to the first circuit breaker and the second circuit breaker, so there will be no wear problems on the transmission parts of the circuit breaker trolley, which facilitates subsequent maintenance and operation and reduces the impact on steelmaking process production.

[0041] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of a power supply device provided by the present invention. The power supply device includes: a first circuit breaker 1, an electric isolation switch 2, a line grounding switch 3, a first isolation cabinet 4, and a second circuit breaker 5;

[0043] The first end of the first circuit breaker 1 is connected to the output end of the first substation, and the second end is connected to the normally open contact of the electric isolation switch 2;

[0044] The normally closed contact of the electric isolation switch 2 is connected to the first end of the first isolation cabinet 4;

[0045] The normally open contact of the line grounding switch 3 is connected to the first end of the first isolation cabinet 4, and the normally closed contact is connected to the ground; under the control of the controller, when the electric isolation switch 2 is closed, the line grounding switch 3 is turned off, and when the electric isolation switch 2 is turned off, the line grounding switch 3 is closed;

[0046] The second end of the first isolation cabinet 4 is connected to the input end of the second substation, so that the second substation performs a voltage reduction operation upon receiving the first voltage transmitted by the first substation to generate a corresponding second voltage;

[0047] A first end of the second circuit breaker 5 is connected to the output end of the second transformer substation, and a second end thereof is connected to a preset transformer, which is connected to the LF furnace.

[0048] In the present utility model, a first circuit breaker 1, an electric isolating switch 2, a line grounding switch 3, a first isolating cabinet 4, and a second circuit breaker 5 are provided in the power supply device, wherein the electric isolating switch 2 and the line grounding switch 3 are controlled by a controller. In actual use, when the electric isolating switch 2 is closed, the line grounding switch 3 is turned off, and when the electric isolating switch 2 is turned off, the line grounding switch 3 is closed. That is, when the power supply device needs to be repaired, there is no need to use the circuit breaker trolleys corresponding to the first circuit breaker 1 and the second circuit breaker 5. The electric isolating switch 2 can be disconnected and the line grounding switch 3 can be closed directly through remote control of the controller, so that the power supply circuit between the first substation and the second substation is disconnected and grounded, thereby improving the safety of the repair process. In addition, because the present solution does not require the use of the circuit breaker trolleys corresponding to the first circuit breaker 1 and the second circuit breaker 5, there will be no wear problems on the transmission parts of the circuit breaker trolley, which is convenient for subsequent repair and operation and reduces the impact on steelmaking process production.

[0049] It should be noted that in actual applications, the controller can be connected to and control the electric isolation switch 2 and the line grounding switch 3 respectively, or the controller can only control the electric isolation switch 2, and the electric isolation switch 2 is linked with the line isolation switch, for example: when the controller controls the electric isolation switch 2 to close, the electric isolation switch 2 drives the line grounding switch 3 to disconnect, and when the controller controls the electric isolation switch 2 to disconnect, the electric isolation switch 2 drives the line grounding switch 3 to close; or the controller can only control the line isolation switch, and the electric isolation switch 2 is linked with the line isolation switch, for example: when the controller controls the line isolation switch to close, the line grounding switch 3 drives the electric isolation switch 2 to disconnect, and when the controller controls the line isolation switch to disconnect, the line grounding switch 3 drives the electric isolation switch 2 to close.

[0050] It should also be noted that when the power supply device of the present application is applied to the LF furnace power supply system, the first substation is generally a 110kV steelmaking substation, and the second substation is generally a 35kV refining substation. In order to reduce the impact of mechanical jamming failures caused by frequent operation of the circuit breaker trolley on the steelmaking process, the present application changes the existing operating mode, and adds an electric isolation switch 2 between the first circuit breaker 1 allocated by the 110kV steelmaking substation and the first isolation cabinet 4 in front of the 35kV refining substation, and adds a line grounding switch 3. After the upper and lower circuit breakers are opened, there is no need to shake the upper and lower circuit breakers to the cold standby state. The electric isolation switch 2 can be used to achieve opening and closing in the background, which reduces the impact of frequent operations on the life of the circuit breaker trolley and reduces the labor intensity of personnel. When repairing the 110kV steelmaking substation, the 35kV refining substation and the LF furnace transformer, the line grounding switch 3 of the electric isolation switch 2 is grounded to ensure on-site maintenance safety. The modified LF furnace power supply system is as follows Figure 3 shown.

[0051] It should also be noted that, for safety reasons, an electrical interlock is set between the electric isolating knife switch 2 and the secondary circuit of the first circuit breaker 1 allocated from the 110kV steelmaking substation, and the normally closed auxiliary points of the electric isolating knife switch 2 and the line grounding knife switch 3 are connected to the closing circuit of the LF furnace circuit breaker to avoid the accident of closing with the grounding knife; if only the secondary circuit of the electric isolating knife switch 2 is set, Figure 4 As shown, the secondary circuit after adding the line isolation switch is as follows Figure 5 In addition, the line grounding switch 3 is connected to the normally closed auxiliary point of the electric isolation switch 2, so that when the first circuit breaker 1 and the second circuit breaker 5 are in the closed position, the electric isolation switch 2 can not be opened or closed with load to avoid misoperation. Figure 4 and Figure 5 In the figure, psl691 is the protection device, QF1 and QF are the first circuit breaker 1 and the second circuit breaker 5 respectively, and HQ is the coil in the secondary circuit. Figure 3 There is no corresponding device representation.

[0052] This embodiment provides a power supply device, which is provided with a first circuit breaker 1, an electric isolating switch 2, a line grounding switch 3, a first isolation cabinet 4, and a second circuit breaker 5. The electric isolating switch 2 and the line grounding switch 3 are controlled by a controller to be closed and turned off accordingly, and when the electric isolating switch 2 is closed, the line grounding switch 3 is turned off. Conversely, when the electric isolating switch 2 is turned off, the line grounding switch 3 is closed. When the electric isolating switch 2 is closed, the LF furnace is powered on and works. During the actual maintenance process, this solution only needs to control the electric isolating switch 2 and the line grounding switch 3. There is no need to use the circuit breaker trolleys corresponding to the first circuit breaker 1 and the second circuit breaker 5, so there will be no wear problems on the transmission parts of the circuit breaker trolley, which is convenient for subsequent maintenance and operation and reduces the impact on the steelmaking process production.

[0053] Based on the above embodiment:

[0054] As an optional embodiment, the method further includes:

[0055] The second isolation cabinet has a first end connected to the output end of the first substation, and a second end connected to the first end of the first circuit breaker 1, and is used to isolate the first substation and the second substation.

[0056] In the present utility model, a second isolation cabinet is further provided in the power supply device, and the function of the second isolation cabinet is to isolate the first substation and the second substation, and ensure that there is an obvious disconnection point between the first substation and the second substation, providing a visible endpoint for the operating personnel to facilitate maintenance and repair operations, to ensure personal safety, and to improve the safety of the solution.

[0057] As an optional embodiment, the method further includes:

[0058] PT cabinet, the first end of the PT cabinet is respectively connected to the normally open contact of the line grounding switch 3 and the normally closed contact of the electric isolation switch 2, and the second end is connected to the first end of the first isolation cabinet 4, for detecting the voltage between the first substation and the second substation.

[0059] In the present invention, a PT cabinet is further provided in the power supply device, and the function of the PT cabinet is to detect the voltage between the first substation and the second substation and meet the needs of relay protection in the power supply system, such as busbar insulation, overvoltage, undervoltage and other conditions, so that the operating personnel can check the voltage in the power supply circuit in time to determine the status of the power supply circuit.

[0060] As an optional embodiment, the PT cabinet includes: a voltage transformer, a first isolating switch, a fuse and a first lightning arrester;

[0061] The first end of the voltage transformer is respectively connected to the normally open contact of the line grounding switch 3 and the normally closed contact of the electric isolation switch 2, and the second end is respectively connected to the first end of the fuse, the first end of the first lightning arrester and the first end of the first isolation switch, for detecting the voltage between the first substation and the second substation;

[0062] The second end of the first isolation switch is connected to the ground;

[0063] The second end of the first lightning arrester is connected to the ground;

[0064] The second end of the fuse is connected to the first end of the first isolation cabinet 4 .

[0065] In the utility model, a voltage transformer, a first isolating switch, a fuse and a first lightning arrester are provided in the PT cabinet. Among them, the voltage transformer is provided between the first substation and the second substation, and is used to detect the voltage between the first substation and the second substation. When the first isolating switch is closed, the entire circuit can be grounded for easy maintenance. The first lightning arrester plays a role in preventing damage from lightning strikes, preventing insulation breakdown of electrical equipment, protecting personal safety, maintaining the normal operation of power equipment and communication equipment, and reducing maintenance costs. The fuse is blown in time when overvoltage occurs in the power supply circuit to protect the safety of the power supply device and personal safety.

[0066] As an optional embodiment, it further includes: a second lightning arrester and a second isolation switch;

[0067] A first end of the second lightning arrester is connected to the second end of the first circuit breaker 1, and a second end is connected to the ground;

[0068] The first end of the second isolating switch is connected to the second end of the first circuit breaker 1 , and the second end is connected to the ground.

[0069] In the utility model, a second lightning arrester and a second isolating knife are also provided in the power supply device. The second lightning arrester can prevent damage from lightning strikes, prevent insulation breakdown of electrical equipment, protect personal safety, maintain the normal operation of power equipment and communication equipment, and reduce maintenance costs. When the second isolating knife is closed, the entire circuit can be grounded for easy maintenance.

[0070] As an optional embodiment, the method further includes:

[0071] A filter module, wherein a first end of the filter module is connected to the second end of the first circuit breaker 1 , and a second end of the filter module is connected to the ground.

[0072] In the present invention, a filtering module is also provided in the power supply device, which is arranged between the first substation and the second substation. After receiving the first voltage transmitted by the first substation, the filtering module can perform corresponding filtering on it and transmit the filtered first voltage to the second substation to improve the efficiency and accuracy of the entire power transformation process.

[0073] It should be noted that, in practical applications, the filtering module may be a capacitor, or an inductor, or an RC (Resistance Capacitor) filtering circuit, an RL (Resistance Inductor) filtering circuit, or an LC (Inductor Capacitor) filtering circuit, or other filtering devices.

[0074] As an optional embodiment, the method further includes:

[0075] A protection device, wherein the first end of the protection device is respectively connected to the normally open contact of the line grounding switch 3 and the normally closed contact of the electric isolation switch 2, and the second end is connected to the first end of the first isolation cabinet 4, and is used to disconnect when an overcurrent or overvoltage occurs in the circuit between the first substation and the second substation.

[0076] In the present invention, a protection device is also provided in the power supply device. The protection device is arranged between the first substation and the second substation. When an overcurrent or overvoltage occurs in the circuit between the first substation and the second substation, the protection device can be disconnected in time to protect the safety of the power supply device and personal safety.

[0077] As an optional embodiment, the method further includes:

[0078] A rectifier, wherein a first end of the rectifier is respectively connected to the normally open contact of the line grounding switch 3 and the normally closed contact of the electric isolation switch 2, and a second end is connected to the first end of the alarm module, and is used to convert the first voltage into a corresponding DC voltage to power the alarm module;

[0079] The alarm module, the second end of the alarm module is connected to the first end of the first isolation cabinet 4, and is used to issue a first alarm when it is powered on, and issue a second alarm when the electric isolation switch 2 is disconnected and the line grounding switch 3 is closed.

[0080] In the present invention, a rectifier and an alarm module are also provided in the power supply device. Since the power supply energy of the alarm module should be DC power, a rectifier is required to convert the first voltage transmitted by the first substation into a corresponding DC voltage and power the alarm module. The alarm module will issue a corresponding alarm after power-on. For example, when maintenance is required, the controller remotely controls the electric isolation switch 2 to disconnect and controls the line grounding switch 3 to close. At this time, the alarm module is not powered and issues a second alarm. On the contrary, when maintenance is not required, the controller remotely controls the electric isolation switch 2 to close and controls the line grounding switch 3 to disconnect. At this time, the alarm module is powered and issues a first alarm. At this time, the first alarm can be a corresponding sound alarm or a corresponding display prompt. On the contrary, the second alarm can be no corresponding sound alarm or no corresponding display prompt.

[0081] As an optional embodiment, the normally closed contact of the electric isolation switch 2 is respectively connected to the first end of the first isolation cabinet 4, the normally open contact of the line grounding switch 3, and the normally closed contact of the line grounding switch 3. The control end of the electric isolation switch 2 is connected to the controller, and is used to close when receiving a closing instruction transmitted by the controller, and drive the line grounding switch 3 to open, and to open when receiving an opening instruction transmitted by the controller, and drive the line grounding switch 3 to close;

[0082] The normally closed contact of the line isolation switch is connected to the ground.

[0083] In the present invention, the normally closed contacts of the electric isolation knife switch 2 and the normally closed contacts of the line isolation knife switch can be controlled in linkage, and the control end of the electric isolation knife switch 2 is connected to the controller, that is, the controller only needs to control the electric isolation knife switch 2 to close to realize the disconnection of the line isolation knife switch, conversely, the controller only needs to control the electric isolation knife switch 2 to disconnect to realize the closing of the line isolation knife switch. When this scheme adopts this connection method, the controller only needs to send corresponding control signals to the electric isolation knife switch 2, which effectively reduces the number of control signals sent by the controller, improves the control efficiency, and reduces the workload of the controller.

[0084] The present invention also provides a corresponding embodiment of a power supply system, comprising: a first substation, a second substation, a preset transformer and the power supply device as described above, wherein the power supply device is respectively connected to the first substation, the second substation and the preset transformer.

[0085] The power supply system provided in this embodiment corresponds to the above-mentioned power supply device, and therefore has the same beneficial effects as the above-mentioned power supply device. Therefore, for the embodiments of the power supply system part, please refer to the description of the embodiments of the power supply device part, which will not be repeated here.

[0086] It should be noted that, in this specification, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0087] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power supply device, characterized in that: include: The first circuit breaker, electric isolating switch, line grounding switch, the first isolation cabinet, and the second circuit breaker; The first end of the first circuit breaker is connected to the output end of the first substation, and the second end is connected to the normally open contact of the electric isolation switch; The normally closed contact of the electric isolation switch is connected to the first end of the first isolation cabinet; The normally open contact of the line grounding switch is connected to the first end of the first isolation cabinet, and the normally closed contact is connected to the ground; Under the control of the controller, when the electric isolation switch is closed, the line grounding switch is turned off; when the electric isolation switch is turned off, the line grounding switch is closed; The second end of the first isolation cabinet is connected to the input end of the second substation, so that the second substation performs a voltage reduction operation upon receiving the first voltage transmitted by the first substation to generate a corresponding second voltage; A first end of the second circuit breaker is connected to an output end of the second transformer substation, and a second end of the second circuit breaker is connected to a preset transformer, and the preset transformer is connected to the LF furnace.

2. The power supply device according to claim 1, wherein: Also includes: A second isolation cabinet, wherein a first end of the second isolation cabinet is connected to the output end of the first substation, and a second end is connected to the first end of the first circuit breaker, and is used to isolate the first substation and the second substation.

3. The power supply device according to claim 1, wherein: Also includes: A PT cabinet, wherein the first end of the PT cabinet is respectively connected to the normally open contact of the line grounding switch and the normally closed contact of the electric isolation switch, and the second end is connected to the first end of the first isolation cabinet, and is used to detect the voltage between the first substation and the second substation.

4. The power supply device according to claim 3, wherein: The PT cabinet includes: a voltage transformer, a first isolating switch, a fuse and a first lightning arrester; The first end of the voltage transformer is respectively connected to the normally open contact of the line grounding switch and the normally closed contact of the electric isolating switch, and the second end is respectively connected to the first end of the fuse, the first end of the first lightning arrester and the first end of the first isolating switch, for detecting the voltage between the first substation and the second substation; The second end of the first isolation switch is connected to the ground; The second end of the first lightning arrester is connected to the ground; The second end of the fuse is connected to the first end of the first isolation cabinet.

5. The power supply device according to claim 1, wherein: Also includes: The second lightning arrester and the second isolating switch; The first end of the second lightning arrester is connected to the second end of the first circuit breaker, and the second end is connected to the ground; The first end of the second isolating switch is connected to the second end of the first circuit breaker, and the second end is connected to the ground.

6. The power supply device according to claim 1, wherein: Also includes: A filter module, wherein a first end of the filter module is connected to the second end of the first circuit breaker, and a second end of the filter module is connected to the ground.

7. The power supply device according to claim 1, wherein: Also includes: A protection device, wherein the first end of the protection device is respectively connected to the normally open contact of the line grounding switch and the normally closed contact of the electric isolation switch, and the second end is connected to the first end of the first isolation cabinet, and is used to disconnect when an overcurrent or overvoltage occurs in the circuit between the first substation and the second substation.

8. The power supply device according to claim 1, wherein: Also includes: a rectifier, wherein a first end of the rectifier is respectively connected to the normally open contact of the line grounding switch and the normally closed contact of the electric isolation switch, and a second end is connected to the first end of the alarm module, and is used to convert the first voltage into a corresponding DC voltage to power the alarm module; An alarm module, the second end of which is connected to the first end of the first isolation cabinet, is used to issue a first alarm when the alarm module is powered on, and to issue a second alarm when the electric isolation switch is disconnected and the line grounding switch is closed.

9. The power supply device according to any one of claims 1 to 8, characterized in that: The normally closed contacts of the electric isolation switch are respectively connected to the first end of the first isolation cabinet, the normally open contact of the line grounding switch and the normally closed contact of the line grounding switch. The control end of the electric isolation switch is connected to the controller, and is used to close when receiving a closing instruction transmitted by the controller, and drive the line grounding switch to open; and to open when receiving an opening instruction transmitted by the controller, and drive the line grounding switch to close; The normally closed contact of the line isolation switch is connected to the ground.

10. A power supply system, characterized in that: include: A first substation, a second substation, a preset transformer, and a power supply device according to any one of claims 1 to 9, wherein the power supply device is connected to the first substation, the second substation, and the preset transformer, respectively.

Images