Single-core cable shielding grounding over-current early warning device for power transformation and distribution station

Abstract

The utility model discloses a single-core cable shielding grounding overcurrent early warning device for a power transformation and distribution station, which comprises three phases of single-core 35kv-110kv cable terminal shielding grounding wires, and a current transformer is correspondingly arranged on each phase of cable terminal shielding grounding wire. A current signal conversion isolation module is electrically connected to detection current output by each current transformer, and the current signal conversion isolation module is electrically connected with a controller for receiving current signals converted by the current signal conversion isolation module. The controller is used for recording the detected current in real time and uploading the detected current to the industrial personal computer, and the controller is electrically connected with an alarm device. According to the utility model, a plurality of structures of the single-core 35kv-110kv cable terminal shielding grounding wire, the current transformer, the current signal conversion isolation module, the controller and the like are combined, so that shielding grounding faults and problems can be found in time, an alarm can be given in time, and accidents and loss caused by the fact that the problems are not found can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of overcurrent warning devices, in particular to a grounding overcurrent warning device for a single-core 35kv-110kv cable shield at a T-junction of a transformer substation or a tower cable. Background Art

[0002] When the high-voltage cable shielding of the high-voltage power distribution system is damaged or the grounding is abnormal, the shielding layer current changes and can reach the working current of the cable core. Excessive shielding current is extremely harmful to the operation of the cable. High temperature may cause the cable to catch fire, leading to a power outage in the high-voltage electrical system, causing great losses.

[0003] In order to solve the above technical problems, it is urgently necessary to provide a grounding single-core 35kv--110kv cable shield grounding overcurrent warning device at the T-junction of the substation and tower cable. Utility Model Content

[0004] In order to solve the above technical problems, the technical solution provided by the utility model is: a single-core cable shielded grounding overcurrent warning device for a substation, including a single-core 35kv-110V cable terminal shielded grounding wire, and a current transformer is installed corresponding to each phase of the 35kv-110kv cable terminal shielded grounding wire. The detection current output by each current transformer is electrically connected to a current signal conversion isolation module, and the current signal conversion isolation module is electrically connected to a controller for receiving the current signal converted by the current signal conversion isolation module. The controller is used to record the detected current in real time and upload it to an industrial computer, and the controller is electrically connected to an audio and sound and light alarm device.

[0005] Furthermore, the controller model is Siemens S71500 controller, which contains a 485 communication module and a power supply module.

[0006] Furthermore, the alarm device is an electric horn, and an intermediate relay is provided between the controller and the electric horn.

[0007] The advantages of utility models compared to existing technologies are:

[0008] The utility model adopts a combination of multiple structures such as a single-core 35kv--110kv cable terminal shielded grounding wire, a current transformer, a current signal conversion isolation module and a controller, which can timely detect shielded grounding faults and problems, can timely alarm, and can avoid accidents and losses caused by failure to detect problems.

[0009] This utility model utilizes a Siemens S71500 controller, an industrial computer, and an operational data display module. When an abnormal grounding or fault occurs on the shielded grounding line of a 35kV-110kV cable terminal, the controller detects the abnormality and uploads it to the industrial computer, which then controls the alarm device to sound an alarm. Based on the alarm logs from the backend industrial computer, staff can quickly identify the specific alarm circuit, the cable phase that experienced the fault, and any changes in the fault, and notify the relevant system dispatchers and responsible personnel to take appropriate action. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The utility model is a structural schematic diagram of a single-core cable shield grounding overcurrent early warning device in a transformer substation.

[0011] Among them, 1. Single-core 35kv--110kv cable terminal shielded grounding wire, 2. Current transformer, 3. Current signal conversion isolation module, 4. Controller, 5. Industrial computer, 6. Electric horn, 7. Intermediate relay, 8. Operation data display module. DETAILED DESCRIPTION

[0012] The present invention will be described in further detail below with reference to the accompanying drawings.

[0013] The present invention will be described in detail with reference to the accompanying drawings.

[0014] In its specific implementation, the utility model provides a single-core cable shield grounding overcurrent warning device for a transformer substation, comprising a single-core 35kv-110V cable terminal shield grounding wire 1, a current transformer 2 being correspondingly installed on each phase of the 35kv-110kv cable terminal shield grounding wire 1, a current signal conversion isolation module 3 being electrically connected to the detection current output by each current transformer, a controller 4 being electrically connected to the current signal conversion isolation module 3 for receiving the current signal converted by the current signal conversion isolation module 3, the controller 4 being used to record the detected current in real time and upload it to an industrial computer 5, and an audio and audio-visual alarm device being electrically connected to the controller 4. Example

[0015] When the utility model is in use, a current transformer 2 is installed on each shielded grounding wire 1 of a three-phase single-core 35kv--110kv cable terminal. The current is selected according to the size of the cable operating load current and the shielded grounding current. The detected current is connected to the current signal conversion isolation module 3. The converted current signal is connected to the Siemens S71500 controller 4 including a 485 communication module and a power supply module. The controller 4 performs real-time detection and recording according to the detected current signal.

[0016] When abnormal grounding or fault occurs on the shielded grounding wire of the three-phase single-core 35kv--110kv cable terminal, the controller 4 detects the abnormal situation and uploads it to the monitoring background host industrial computer 5 to issue an alarm. The equipment operation personnel can quickly find out the specific alarm circuit and which phase of the cable has the fault and the fault change based on the background host alarm record, and notify the relevant system dispatcher, person in charge, etc. to deal with it.

[0017] The utility model fills the blank of the detection and early warning device for high-voltage cable shield grounding fault. When manufacturing the early warning device, a stainless steel shell can be used, which is easy to install and can be windproof indoors and outdoors.

[0018] The utility model can be expanded according to the number of high-voltage cables.

[0019] The device detects accurate data, and uploads and alarms reliable information, which can prevent accidents in advance and avoid major losses caused by power outages caused by accidents.

[0020] In order to facilitate the detection and recording of the current signal, the controller 4 is a Siemens S71500 controller, which contains a 485 communication module and a power supply module.

[0021] In order to facilitate the issuance of alarm information, the alarm device is an electric horn 6 , and an intermediate relay 7 is provided between the controller 4 and the electric horn 6 .

[0022] In order to facilitate the display of the detection data, the industrial computer 5 is electrically connected to an operation data display module 8. The operation data display module 8 is a display screen.

[0023] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. A single-core cable shield grounding overcurrent warning device for a transformer substation, comprising a single-core 35kV-110V cable terminal shield grounding wire (1), characterized in that: A current transformer (2) is correspondingly installed on each phase of the 35kv-110kv cable terminal shielded grounding wire (1), and the detection current output by each current transformer is electrically connected to a current signal conversion isolation module (3). The current signal conversion isolation module (3) is electrically connected to a controller (4) for receiving the current signal converted by the current signal conversion isolation module (3). The controller (4) is used to record the detected current in real time and upload it to an industrial control computer (5). The controller (4) is electrically connected to an audio and sound and light alarm device.

2. The single-core cable shield grounding overcurrent warning device of a transformer substation according to claim 1, characterized in that: The controller (4) is a Siemens S71500 controller, which contains a 485 communication module and a power supply module.

3. The single-core cable shield grounding overcurrent warning device of a transformer substation according to claim 1, characterized in that: The alarm device is an electric horn (6), and an intermediate relay (7) is provided between the controller (4) and the electric horn (6).

4. The single-core cable shield grounding overcurrent warning device of a transformer substation according to claim 1, characterized in that: The industrial control computer (5) is electrically connected to an operation data display module (8).

5. The single-core cable shield grounding overcurrent warning device of a transformer substation according to claim 4, characterized in that: The operation data display module (8) is a display screen.

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