Automatic grid-connected protection mechanism and control device

Abstract

The utility model belongs to the technical field of hydropower station grid-connected protection, and particularly relates to an automatic grid-connected protection mechanism and a control device, comprising an automatic grid-connected protection assembly, the automatic grid-connected protection assembly comprises a frequency relay, one side of the frequency relay is provided with a relay wiring port, and the other side of the frequency relay is provided with a power supply. A relay wiring port is formed in one side of the frequency relay, a power grid wire is electrically connected to the interior of the relay wiring port, an anti-falling plug is connected to the side of the power grid wire in a glued mode, a sealing fixing plug is connected to the outer portion of the anti-falling plug in a threaded mode, and a connecting wire is electrically connected to the other side of the frequency relay; according to the utility model, a power grid can be protected by using the relay, damage to the power grid caused by overlarge frequency or voltage can be prevented, and the anti-drop plug is arranged at the position where the electric wire is connected to the relay, so that connection between the electric wire and the relay can be reinforced, and the electric wire is prevented from falling off from the relay to affect the protection work of the relay.

Description

Technical Field

[0001] The utility model relates to the technical field of hydropower station grid connection protection, in particular to an automatic grid connection protection mechanism and a control device. Background Art

[0002] In the power system, the interface between the power station and the power grid is called the power station outlet or the power station bus. The power station can choose to connect the power station outlet to the power grid to achieve grid-connected operation of the power plant; it can also choose to isolate the power station outlet from the power grid to achieve isolated grid operation of the power plant. Isolated grid operation means that during the operation of the power plant, it is isolated from the power grid and builds a small grid by itself, using internal energy to absorb and adjust load fluctuations. Grid-connected operation means that the power plant connects the power station outlet to the power grid, and together with other power plants and loads, forms a power system to supply the electricity market together.

[0003] Existing automatic grid-connected devices usually install some relays in the power grid to prevent circuit short circuits or failures caused by frequency or voltage overloads in the power grid. However, when connecting the relays to the wires in the power grid, the ends of the wires are usually directly connected to the inside of the relays. There is a lack of fixing and protective structures. The wires in the power grid are exposed to the outside and are affected by strong winds and other weather conditions. A pulling force will be applied to the wires, which can easily cause the wires at the connection to fall off the relay, thereby affecting the protective effect of the relay on the power grid.

[0004] Therefore, an automatic grid-connected protection mechanism and a control device are proposed to address the above problems. Utility Model Content

[0005] In order to make up for the deficiencies of the prior art and solve the problem that the existing automatic grid-connected devices usually install some relays in the power grid to prevent circuit short circuits or failures caused by frequency or voltage overloads in the power grid, however, when connecting the relays to the wires in the power grid, the ends of the wires are usually directly connected to the inside of the relays, and there is a lack of fixing and protective structures. The wires in the power grid are exposed to the outside and are affected by strong winds and other weather conditions, which will exert a pulling force on the wires, easily causing the wires at the connection to fall off the relay, thereby affecting the protective effect of the relay on the power grid.

[0006] The technical solution adopted by the utility model to solve its technical problems is: the automatic grid-connected protection mechanism and control device described in the utility model include an automatic grid-connected protection component, the automatic grid-connected protection component includes a frequency relay, a relay wiring port is installed on one side of the frequency relay, and the inside of the relay wiring port is electrically connected to a grid wire, the side of the grid wire is glued and connected to an anti-detachment plug, and the external thread of the anti-detachment plug is connected to a sealing fixing plug, the other side of the frequency relay is electrically connected to a connecting wire, and the end of the connecting wire is electrically connected to a voltage relay.

[0007] Preferably, the sealing fixing plug and the power grid wire form a snap-fit ​​structure, and the sealing fixing plug and the anti-detachment plug form a threaded detachable structure.

[0008] Preferably, it also includes an automatic grid-connected protection component and a protective shell component installed on the outside of the automatic grid-connected protection component, the back of the protective shell component is installed with a protection and control device installation component, the protective shell component includes a control device protective shell shell, the side of the control device protective shell shell is fixedly connected with a hinge, and the other side of the hinge is fixedly connected with a sealing door panel, and the inner wall of the sealing door panel is fixedly connected with a sealing rubber ring, the back of the control device protective shell shell is welded with a heat conducting plate, and the outer wall of the heat conducting plate is fixedly connected with a heat sink.

[0009] Preferably, the cross-sectional shape of the heat sink is "S"-shaped, and the heat sink is arranged at equal intervals about the outer wall of the heat conductive plate, two heat conductive plates are symmetrically arranged about the vertical center axis of the protective housing shell of the control device, and the area of ​​the heat conductive plate is consistent with the area of ​​the back of the frequency relay, and the inner wall of the heat conductive plate is tightly fitted to the back of the frequency relay.

[0010] Preferably, the protection and control device installation assembly includes a first lifting pillar, a side threaded connection with a limiting bolt, and the first lifting pillar is internally slidably connected to a second lifting pillar, the top of the second lifting pillar is welded with an I-shaped block, and the side of the I-shaped block is clamped and connected to a first fixed block, one end of the first fixed block is penetrated by a fixing screw, and the other end of the first fixed block is rotatably connected to a first rotating shaft, the outside of the first rotating shaft is fixedly connected to a receiving block, and the side of the receiving block is fixedly connected to a second rotating shaft, and the end of the second rotating shaft is rotatably connected to a second fixed block.

[0011] Preferably, the first fixed block forms a rotating structure with the receiving block via a first rotating shaft, the second fixed block forms a rotating structure with the receiving block via a second rotating shaft, and the receiving block is fixedly connected to the protective housing shell of the control device.

[0012] Preferably, the end of the limiting bolt is tightly fitted to the outer wall of the second lifting support, and a sliding structure is formed between the second lifting support and the first lifting support.

[0013] The utility model is beneficial in that:

[0014] 1. The utility model is provided with an automatic grid-connected protection component, and the frequency and voltage of the power grid can be detected by using a frequency relay and a voltage relay. When the frequency or voltage exceeds a preset value, the power grid can be powered off, thereby facilitating the prevention of damage to the power grid caused by excessive frequency or voltage, and an anti-dropping plug and a sealing fixing plug are provided before the wire is connected to the relay. The anti-dropping plug is stuck inside the protective housing of the control device. When the external power grid wire is affected by strong winds and other weather conditions and is subjected to pulling force, the anti-dropping plug can limit the power grid wire to prevent the connection position between the power grid wire and the relay wiring port from becoming loose, thereby facilitating the prevention of poor contact between the wire and the relay, which affects the protection of the relay to the power grid;

[0015] 2. The utility model is provided with a protective shell assembly, and the protective shell of the control device is covered on the outside of the protective mechanism to protect it and cooperate with the sealing door panel and the sealing rubber ring to prevent rain or moisture from the outside from invading the inside of the device and corroding the electronic components inside it. The heat sink is tightly attached to the back of the relay through the heat conducting plate, so that the heat generated by the relay during operation can be dissipated, and the heat sink with an "S"-shaped cross-section can increase the contact area between the heat sink and the outside air, thereby enhancing the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model as a whole from the side;

[0018] Figure 2 It is a three-dimensional structural schematic diagram of the automatic grid-connected protection component part of the utility model;

[0019] Figure 3 It is a three-dimensional structural schematic diagram of the anti-dropping plug part of the utility model;

[0020] Figure 4 It is a three-dimensional structural schematic diagram of the protective housing component part of the present invention;

[0021] Figure 5 It is a three-dimensional structural schematic diagram of the heat dissipation plate part of the utility model;

[0022] Figure 6 It is a three-dimensional structural diagram of the installation component part of the protection and control device of the utility model;

[0023] Figure 7 It is a three-dimensional structural schematic diagram of the I-shaped card block part of the utility model.

[0024] In the figure: 1. Automatic grid-connected protection component; 2. Protection shell component; 3. Protection and control device installation component; 101. Frequency relay; 102. Relay wiring port; 103. Grid wire; 104. Anti-drop plug; 105. Sealing fixing plug; 106. Connecting wire; 107. Voltage relay; 201. Control device protection shell shell; 202. Hinge; 203. Sealing door panel; 204. Sealing rubber ring; 205. Heat conduction plate; 206. Heat sink; 301. First lifting pillar; 302. Limiting bolt; 303. Second lifting pillar; 304. I-shaped block; 305. First fixed block; 306. Fixing screw; 307. First rotating shaft; 308. Receiving block; 309. Second rotating shaft; 310. Second fixed block. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Embodiment 1

[0027] See also Figure 2 and Figure 3 As shown, the automatic grid-connected protection mechanism includes an automatic grid-connected protection component 1, and the automatic grid-connected protection component 1 includes a frequency relay 101. A relay connection port 102 is installed on one side of the frequency relay 101, and the inside of the relay connection port 102 is electrically connected to a grid wire 103, and the side of the grid wire 103 is glued to an anti-detachment plug 104, and the external thread of the anti-detachment plug 104 is connected to a sealing fixing plug 105, and the other side of the frequency relay 101 is electrically connected to a connecting wire 106, and the end of the connecting wire 106 is electrically connected to a voltage relay 107.

[0028] See also Figure 2 and Figure 3As shown, the automatic isolated grid protection mechanism, the sealing fixing plug 105 and the grid wire 103 form a snap-fit ​​structure, and the sealing fixing plug 105 and the anti-dropping plug 104 form a threaded detachable structure. The frequency relay 101 and the voltage relay 107 are used to detect the frequency and voltage of the grid. When the frequency or voltage exceeds the preset value, the grid can be powered off, thereby facilitating the prevention of damage to the grid caused by excessive frequency or voltage. In addition, the anti-dropping plug 104 and the sealing fixing plug 105 are provided at the position before the wire is connected to the relay. The anti-dropping plug 104 is stuck in the inside of the protective housing shell 201 of the control device. When the external grid wire 103 is affected by strong winds and other weather conditions and is subjected to pulling force, the anti-dropping plug 104 can limit the grid wire 103 to prevent the grid wire 103 from being loosened at the connection position with the relay wiring port 102, thereby facilitating the prevention of poor contact between the wire and the relay, which affects the protection of the relay to the grid.

[0029] Embodiment 2

[0030] See also Figure 1 As shown, the control device also includes an automatic grid-connected protection component 1 and a protective shell component 2 installed outside the automatic grid-connected protection component 1, and a protection and control device installation component 3 is installed on the back of the protective shell component 2.

[0031] See also Figure 4 and Figure 5As shown, the control device, the protective shell assembly 2 includes a control device protective shell shell 201, a hinge 202 is fixedly connected to the side of the control device protective shell shell 201, and a sealing door plate 203 is fixedly connected to the other side of the hinge 202, and a sealing rubber ring 204 is fixedly connected to the inner wall of the sealing door plate 203, a heat conducting plate 205 is welded to the back of the control device protective shell shell 201, and a heat dissipation plate 206 is fixedly connected to the outer wall of the heat conducting plate 205, the cross-sectional shape of the heat dissipation plate 206 is set in an "S" shape, and the heat dissipation plates 206 are arranged at equal intervals with respect to the outer wall of the heat conducting plate 205, and two heat conducting plates 205 are symmetrically arranged with respect to the vertical center axis of the control device protective shell shell 201, and the heat conducting plates 205 are arranged at equal intervals with respect to the vertical center axis of the control device protective shell shell 201. The area is consistent with the area of ​​the back of the frequency relay 101, and the inner wall of the heat conducting plate 205 is tightly fitted with the back of the frequency relay 101. The protective shell 201 of the control device covers the outside of the protective mechanism to protect it and cooperates with the sealing door panel 203 and the sealing rubber ring 204 to prevent external rain or moisture from invading the interior of the device and corroding the electronic components inside it. The heat sink 206 is tightly attached to the back of the relay through the heat conducting plate 205, so that the heat generated by the relay during operation can be dissipated. The heat sink 206 with an "S"-shaped cross-section can increase the contact area between the heat sink 206 and the outside air, thereby enhancing the heat dissipation effect.

[0032] See also Figure 6 and Figure 7 As shown, the control device, protection and control device installation assembly 3 includes a first lifting support 301, a side of the first lifting support 301 is threadedly connected with a limit bolt 302, and the first lifting support 301 is internally slidably connected with a second lifting support 303, a top of the second lifting support 303 is welded with an I-shaped block 304, and the side of the I-shaped block 304 is clamped and connected with a first fixed block 305, one end of the first fixed block 305 is penetrated by a fixing screw 306, and the other end of the first fixed block 305 is rotatably connected with a first rotating shaft 307, and the outside of the first rotating shaft 307 is fixedly connected with a receiving block 308 , and the side of the receiving block 308 is fixedly connected with a second rotating shaft 309, and the end of the second rotating shaft 309 is rotatably connected with a second fixed block 310, the first fixed block 305 and the receiving block 308 form a rotating structure through the first rotating shaft 307, the second fixed block 310 and the receiving block 308 form a rotating structure through the second rotating shaft 309, and the receiving block 308 and the control device protective shell 201 are fixedly connected, the end of the limiting bolt 302 is tightly fitted with the outer wall of the second lifting pillar 303, and a sliding structure is formed between the second lifting pillar 303 and the first lifting pillar 301.

[0033] Working principle: This device is installed and connected in the power grid of the hydropower station to protect and control it. When the device is connected to the power grid route, if there is a support such as a telephone pole at the connection position, the first fixed block 305 and the second fixed block 310 can be rotated to open, clamp it on the support, and screw on the fixing screws 306 and nuts to install and fix it. If there is no support nearby, it can be supported by the lifting rod, and the first fixed block 305 and the second fixed block 310 are clamped on the I-shaped block 304, and the fixing screws 306 and nuts are screwed on to fix it. Then, according to the height of the wire, the second lifting support 303 is slidably adjusted to make the position of the side inlet hole of the control device protective shell 201 almost reach the height of the power grid wire 103, and then the limiting bolt 302 is rotated and tightened to make the end of the limiting bolt 302 tightly against the second lifting support 303, and it can be fixed in a limited position, and then the bottom end of the first lifting support 301 is fixed to the ground;

[0034] Insert the grid wire 103 through the wire hole on the side of the control device protective housing shell 201 and connect it to the relay wiring port 102. Then, clamp the anti-dropping plug 104 on the side of the grid wire 103 inside the control device protective housing shell 201 and use glue to connect and fix them together. At the same time, clamp the sealing fixing plug 105 on the position of the grid wire 103 outside the control device protective housing shell 201 and screw it on the anti-dropping plug 104 to fix it. Then, use the same method to connect another grid wire 103 to the side of the voltage relay 107.

[0035] Finally, the sealing door plate 203 is rotated and closed, so that the sealing rubber ring 204 on the inner wall of the sealing door plate 203 is close to the protective shell 201 of the control device, and the sealing door plate 203 and the protective shell 201 of the control device are fixed together by the locking structure. During the transmission process, the current in the grid wire 103 will first pass through the frequency relay 101, and be transmitted to the voltage relay 107 through the connecting wire 106, and finally flow out of the entire protection mechanism and control. During the flow process, if its frequency or voltage exceeds the limit value of the frequency relay 101 and the voltage relay 107, the frequency relay 101 and the voltage relay 107 will cut off the power to the entire circuit, thereby preventing the frequency or voltage from being too large to cause damage to the grid. The heat generated by the frequency relay 101 and the voltage relay 107 during operation will be transmitted to the heat sink 206 through the heat conduction plate 205 on the back, and then dissipated to the outside air through the heat sink 206.

[0036] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. Automatic grid-connected protection mechanism, characterized by: The invention comprises an automatic grid-connected protection component (1), wherein the automatic grid-connected protection component (1) comprises a frequency relay (101), a relay connection port (102) is installed on one side of the frequency relay (101), and the inside of the relay connection port (102) is electrically connected to a grid wire (103), an anti-dropping plug (104) is glued to the side of the grid wire (103), and the external thread of the anti-dropping plug (104) is connected to a sealing fixing plug (105), and the other side of the frequency relay (101) is electrically connected to a connecting wire (106), and the end of the connecting wire (106) is electrically connected to a voltage relay (107).

2. The automatic grid-connected protection mechanism according to claim 1 is characterized in that: The sealing fixing plug (105) and the power grid wire (103) form a snap-fit ​​structure, and the sealing fixing plug (105) and the anti-detachment plug (104) form a threaded detachable structure.

3. A control device, comprising an automatic grid-connected protection mechanism according to any one of claims 1 to 2, characterized in that: It also includes an automatic grid-connected protection component (1) and a protective housing component (2) installed outside the automatic grid-connected protection component (1), wherein a protection and control device installation component (3) is installed on the back of the protective housing component (2); The protective housing assembly (2) comprises a control device protective housing shell (201), a hinge (202) being fixedly connected to the side of the control device protective housing shell (201), a sealing door plate (203) being fixedly connected to the other side of the hinge (202), a sealing rubber ring (204) being fixedly connected to the inner wall of the sealing door plate (203), a heat conducting plate (205) being welded to the back of the control device protective housing shell (201), and a heat dissipation plate (206) being fixedly connected to the outer wall of the heat conducting plate (205).

4. The control device according to claim 3, characterized in that: The cross-sectional shape of the heat sink (206) is set in an "S" shape, and the heat sink (206) is arranged at equal intervals with respect to the outer wall of the heat conducting plate (205), two heat conducting plates (205) are symmetrically arranged with respect to the vertical center axis of the control device protective housing shell (201), and the area of ​​the heat conducting plate (205) is consistent with the area of ​​the back of the frequency relay (101), and the inner wall of the heat conducting plate (205) and the back of the frequency relay (101) are set to be tightly fitted.

5. The control device according to claim 3, characterized in that: The protection and control device installation assembly (3) comprises a first lifting support (301), the side of the first lifting support (301) is threadedly connected to a limit bolt (302), and the first lifting support (301) is slidably connected to a second lifting support (303) inside, the top of the second lifting support (303) is welded to an I-shaped block (304), and the side of the I-shaped block (304) is snap-connected to a first fixed block (305), one end of the first fixed block (305) is penetrated by a fixing screw (306), and the other end of the first fixed block (305) is rotatably connected to a first rotating shaft (307), the outside of the first rotating shaft (307) is fixedly connected to a receiving block (308), and the side of the receiving block (308) is fixedly connected to a second rotating shaft (309), and the end of the second rotating shaft (309) is rotatably connected to a second fixed block (310).

6. The control device according to claim 5, characterized in that: The first fixed block (305) forms a rotating structure with a receiving block (308) via a first rotating shaft (307), the second fixed block (310) forms a rotating structure with a receiving block (308) via a second rotating shaft (309), and the receiving block (308) is fixedly connected to the protective housing shell (201) of the control device.

7. The control device according to claim 5, characterized in that: The end of the limiting bolt (302) is tightly fitted to the outer wall of the second lifting support (303), and a sliding structure is formed between the second lifting support (303) and the first lifting support (301).

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