Partial discharge and temperature online sensing device based on intelligent ring main unit

Abstract

The utility model provides a partial discharge and temperature on-line sensing device based on an intelligent ring main unit, which comprises a detection host, a wireless passive temperature sensor, a fault current sensor and a high-voltage live sensor, a fixed plate is fixedly arranged on the end face of one side of the detection host, an OLED groove is arranged in the fixed plate, a liquid crystal screen is arranged in the OLED groove, and the liquid crystal screen is connected with the wireless passive temperature sensor. The end face of one side of the fixing plate is provided with three line interfaces, and the line interfaces are arranged in a matrix. The partial discharge and temperature on-line monitoring device integrates partial discharge and temperature on-line monitoring, high-voltage live-line indication and fault indication functions, can detect, analyze and continuously monitor partial discharge signals and cable head temperature rise in a cabinet, provides a criterion for evaluating the insulation level and the aging degree, can effectively monitor the insulation state of the switch cabinet, and improves the reliability of the switch cabinet. And meanwhile, the functions of a high-voltage live display and a panel type fault indicator are also considered. And the real-time monitoring data is uploaded to the DTU or the monitoring background.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent ring network cabinets, in particular to a local discharge and temperature online sensing device based on an intelligent ring network cabinet. Background Art

[0002] Switchgear is a direct device for supplying power to distribution networks and users, and is widely used in power systems. During operation, these devices are inevitably affected by various factors such as electricity, heat, machinery and environment. Their insulation medium continues to deteriorate, resulting in poor operating conditions and even various faults, causing local or even large-scale power outages, resulting in huge direct or indirect economic losses. Moreover, due to the small internal space, numerous parts, complex structure and small insulation distance of the switchgear, it is more prone to insulation defects than other power equipment.

[0003] Insulation defects are one of the main causes of switchgear failures. Partial discharge is the main manifestation of insulation defects and the main cause of further deterioration of insulation defects. Defects are manifested as external insulation to ground flashover breakdown, internal insulation to ground flashover breakdown, phase-to-phase insulation flashover breakdown, lightning overvoltage flashover breakdown, porcelain bottle bushing, capacitor bushing flashover, pollution flashover, breakdown, explosion, lifting rod flashover, CT flashover, breakdown, explosion, porcelain bottle breakage, etc. Among various switchgears, 10kV and above voltage level switchgears have the largest number of installations and the most failures, and the consequences are also very serious.

[0004] Partial discharge generally does not cause penetrating breakdown of the insulation inside the switch cabinet, but it can cause local damage to the insulating medium. If it exists for a long time, it will cause damage to the electrical strength of the insulating device under certain conditions, and eventually cause insulation breakdown inside the switch cabinet. Therefore, monitoring and detecting partial discharge of electrical equipment is an important means of evaluating the insulation condition of the equipment, and is also one of the effective measures to discover latent equipment faults, ultimately achieve fault warning, and avoid faults. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the utility model provides an online sensing device for partial discharge and temperature based on an intelligent ring main unit, which solves the problems raised in the above-mentioned background technology.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the utility model is implemented through the following technical solutions: based on the partial discharge and temperature online sensing device of the intelligent ring network cabinet, it includes a detection host, a wireless passive temperature sensor, a fault current sensor and a high-voltage live sensor. A fixing plate is fixedly provided on one end face of the detection host, and an OLED groove is provided in the fixing plate. The OLED groove is used to install a liquid crystal screen. Three line interfaces are provided on one end face of the fixing plate, and the line interfaces are arranged in a matrix. Four indicator lights are provided on one end face of the fixing plate and above the line interfaces. The indicator lights are arranged in a matrix. Four mounting grooves opening outward are provided at the four corners of the end face of one side of the detection host.

[0009] Preferably, a data storage slot is provided on one end surface of the fixing plate, and a signal interface is provided on one side of the data storage slot.

[0010] Preferably, the wireless passive temperature sensor comprises a working cavity opening outward, and a detachable mounting cover can be installed on the top of the wireless passive temperature sensor.

[0011] Preferably, the mounting cover and the wireless passive temperature sensor are mounted and connected via a mounting rod.

[0012] Preferably, an annular electricity-collecting alloy sheet is installed in the working chamber.

[0013] Preferably, a movably mounted silicone strap is provided in the working chamber.

[0014] Preferably, both sides of the wireless passive temperature sensor are provided with installation slots opening outward, the installation slots on both sides are symmetrically positioned, and two protection plates can be respectively sleeved into the installation slots to protect the wireless passive temperature sensor in a closed space.

[0015] (III) Beneficial effects

[0016] The utility model provides a partial discharge and temperature online sensing device based on an intelligent ring main unit. It has the following beneficial effects:

[0017] 1. The partial discharge and temperature online monitoring device of this solution integrates partial discharge and temperature online monitoring, high voltage live indication and fault indication functions. The device can detect, analyze and continuously monitor the partial discharge signal and cable head temperature rise in the cabinet, provide a criterion for evaluating its insulation level and aging degree, and can effectively monitor the insulation status of the switch cabinet. At the same time, it also takes into account the functions of high voltage live display and panel type fault indicator. The real-time monitoring data will be uploaded to the DTU or monitoring background.

[0018] 2. This solution enables the protection plates on both sides to be installed on both sides of the wireless passive temperature sensor when the wireless passive temperature sensor is connected to a location with a poor environment, thereby protecting the power-taking alloy sheet and the wireless passive temperature sensor and improving the detection stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the appearance structure of the detection host of the utility model;

[0020] Figure 2 This is a schematic diagram of the main structure of the detection host of the utility model;

[0021] Figure 3 This is a front view structural diagram of the detection host of the utility model;

[0022] Figure 4 This is a schematic diagram of the appearance structure of the wireless passive temperature sensor of the utility model;

[0023] Figure 5 This is a front view of the appearance structure of the wireless passive temperature sensor of the utility model;

[0024] Figure 6 This is a schematic diagram of the working state of the wireless passive temperature sensor of the utility model;

[0025] Figure 7 This is a system architecture diagram of the utility model.

[0026] In the figure: 101, detection host; 102, OLED slot; 103, line interface; 104, fixing plate; 105, installation slot; 106, signal interface; 107, data storage slot; 108, indicator light; 109, installation cover; 111, installation slot; 112, wireless passive temperature sensor; 113, silicone strap; 114, power extraction alloy sheet; 115, installation rod; 116, protection plate; 117, working chamber. DETAILED DESCRIPTION

[0027] The utility model embodiment provides a partial discharge and temperature online sensing device based on an intelligent ring main unit, such as Figure 1-7 As shown, it includes a detection host 101, a wireless passive temperature sensor 112, a fault current sensor and a high-voltage live sensor. A fixing plate 104 is fixedly arranged on one end face of the detection host 101. An OLED groove 102 is arranged in the fixing plate 104. The OLED groove 102 is used to install a liquid crystal screen. Three line interfaces 103 are arranged on one end face of the fixing plate 104. The line interfaces 103 are arranged in a matrix. Four indicator lights 108 are arranged on one end face of the fixing plate 104 and above the line interfaces 103. The indicator lights 108 are arranged in a matrix. Four mounting grooves 105 with outward openings are arranged at four corners of one end face of the detection host 101.

[0028] It should be noted that a magnetic plate can be installed in the installation slot 105 to facilitate the magnetic installation and connection of the detection host 101, and the silicone strap 113 corresponds to the three single-phase branches A, B, and C of the high-voltage cable respectively.

[0029] It should be further explained that the detection host 101 can be connected to 3 high-voltage live sensors, 3 short-circuit current sensors, 1 ground current sensor, and 120 wireless passive temperature sensors 112. The high-voltage live sensor is connected to the detection host 101 through a 50-ohm coaxial cable; the wireless passive temperature sensor 112 is connected to the detection host 101 through wireless lora communication; the short-circuit ground current sensor is connected to the detection host 101 through an optical fiber; the 485 bus and Modbus-RTU protocol are used for remote communication, and multi-core cable wiring with integrated power supply and communication can be used on site.

[0030] like Figure 2 As shown, a data storage slot 107 is provided on one end surface of the fixing plate 104 , and a signal interface 106 is provided on one side of the data storage slot 107 .

[0031] It is worth noting that the detection host 101 adopts an aluminum alloy shell, has extremely strong electromagnetic compatibility and anti-interference capabilities, and uses pluggable terminals to facilitate on-site installation and wiring.

[0032] like Figure 4-Figure 6 As shown, the wireless passive temperature sensor 112 includes a working cavity 117 opening outward, and a detachable mounting cover 109 can be mounted on the top of the wireless passive temperature sensor 112 .

[0033] Furthermore, the mounting cover 109 and the wireless passive temperature sensor 112 are mounted and connected via a mounting rod 115 .

[0034] Furthermore, an annular power-taking alloy sheet 114 is installed in the working chamber 117 .

[0035] It should be further explained that the power-collecting alloy sheet 114 is used for inductive power collection.

[0036] Furthermore, a movably mounted silicone strap 113 is provided in the working cavity 117 .

[0037] It is worth noting that a sensor temperature probe is provided on the other end face of the wireless passive temperature sensor 112 , which is in close contact with the surface of the temperature-measured component when installed, and performs local temperature detection.

[0038] Furthermore, the wireless passive temperature sensor 112 is provided with outwardly opening mounting slots 111 on both sides, and the mounting slots 111 on both sides are symmetrically positioned. Two protection plates 116 can be respectively installed in the mounting slots 111 to protect the wireless passive temperature sensor 112 in a closed space.

[0039] When using this solution, first install the detection host 101 as a whole in an embedded manner at a suitable position on the switch cabinet secondary room panel. The installation principle is that the wiring distance from the monitoring host to the sensor should be as short as possible without affecting the normal operation of the switch cabinet equipment, the line length should be as uniform as possible, and it should be convenient to obtain power and maintain. The specific installation position can be appropriately adjusted according to the on-site installation, construction and wiring convenience.

[0040] The wireless passive temperature sensor 112 is then installed in a bundled manner on the A, B, and C single-phase branches of the high-voltage cable. Each sensor carries a label with a unique communication address when it leaves the factory and needs to be installed in sequence on site. The yellow, green, and red sensors need to be installed corresponding to the line phase sequence.

[0041] The three short-circuit current sensors are installed on the A, B, and C phases of the cable respectively. After the cable clamp is put on the cable, the two hanging nails of the sensor are inserted along the opening direction of the clamp. After the sensor and the clamp are connected, the fastening screw on the clamp is rotated to fix the sensor on the phase cable and fastened with a cable tie to prevent sliding or falling off.

[0042] At this time, the wireless passive temperature sensor 112 is in contact with the cable to condition and amplify the signal, and wireless communication with the detection host 101 is achieved through lora communication, and signal transmission is completed to achieve centralized processing.

[0043] Subsequently, the OLED display screen installed in the OLED slot 102 can be used to display partial discharge and temperature detection data (such as partial discharge probability intensity, average intensity, discharge frequency, cable head temperature, etc.), fault monitoring status, communication connection status, historical records, etc. in real time on site, and system parameter modification and configuration operations can also be performed.

[0044] When the binding environment of the wireless passive temperature sensor 112 is poor, the protection plates 116 on both sides are inserted and installed on both sides of the wireless passive temperature sensor 112, thereby protecting the power-taking alloy sheet 114 and the wireless passive temperature sensor 112 and improving the detection stability.

[0045] The PD and temperature four-in-one online monitoring device is suitable for real-time online monitoring and status indication of partial discharge and temperature charged status and line fault status of switchgear with voltage level of 10KV and above and its internal high-voltage equipment. The relevant monitoring data (PD data, temperature data, fault information, etc.) are displayed on the display screen of the monitoring host. When necessary, an alarm signal is given to timely discover the insulation defects of the switchgear, and provide a basis for evaluating its insulation level and aging degree, and provide a basis for the maintenance of the switchgear. Support RS485 and short-distance wireless communication methods; support local and flexible configuration of parameters such as PD alarm parameters, temperature alarm parameters, automatic reset time, device address number, baud rate, etc.; at the same time, it can also connect to the host computer debugging software through the maintenance interface to realize device software version upgrade, parameter download, monitoring data viewing and export, etc.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Based on the intelligent ring main unit partial discharge and temperature online sensing device, it is characterized by: The invention comprises a detection host (101), a wireless passive temperature sensor (112), a fault current sensor and a high-voltage live sensor. A fixing plate (104) is fixedly provided on one end face of the detection host (101), an OLED slot (102) is provided in the fixing plate (104), three line interfaces (103) are provided on one end face of the fixing plate (104), and the positions of the line interfaces (103) are arranged in a matrix. Four indicator lights (108) are provided on one end face of the fixing plate (104) and above the line interfaces (103), and the positions of the indicator lights (108) are arranged in a matrix. Four mounting slots (105) with outward openings are provided at four corners of one end face of the detection host (101).

2. According to the device for online partial discharge and temperature sensing based on intelligent ring main unit according to claim 1, it is characterized in that: A data storage slot (107) is provided on one end surface of the fixed plate (104), and a signal interface (106) is provided on one side of the data storage slot (107).

3. The online partial discharge and temperature sensing device based on the intelligent ring main unit according to claim 2 is characterized in that: The wireless passive temperature sensor (112) comprises a working chamber (117) opening outward, and a mounting cover (109) can be mounted on the top of the wireless passive temperature sensor (112).

4. The online partial discharge and temperature sensing device based on the intelligent ring main unit according to claim 3 is characterized in that: The mounting cover (109) and the wireless passive temperature sensor (112) are mounted and connected via a mounting rod (115).

5. The partial discharge and temperature online sensing device based on the intelligent ring main unit according to claim 4 is characterized in that: An electricity-collecting alloy sheet (114) is installed in the working chamber (117).

6. The online partial discharge and temperature sensing device based on the intelligent ring main unit according to claim 5 is characterized in that: A silicone watchband (113) is arranged in the working chamber (117).

7. The on-line sensing device for partial discharge and temperature based on intelligent ring main unit according to claim 6 is characterized in that: The wireless passive temperature sensor (112) is provided with outwardly opening mounting slots (111) on both sides, the mounting slots (111) on both sides are symmetrically positioned, and two protection plates (116) can be respectively sleeved into the mounting slots (111) to protect the wireless passive temperature sensor (112) in a closed space.

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