A water level monitoring and control system suitable for substation cable trench

Abstract

The present invention discloses a water level monitoring and control system suitable for a substation cable trench, including a water level monitoring device, a background control terminal and a gear control circuit; the water level monitoring device and the background control terminal are electrically connected to the gear control circuit respectively; the water level monitoring device is used to monitor the water level, the gear control circuit is used to monitor the gear and control the motor, and the background control terminal is used to display the gear status. The present invention realizes real-time monitoring of the water level of the substation cable trench, and displays it on the background monitoring terminal, avoiding personnel from opening the cable trench to check the water level; the water level monitoring device and the gear control circuit automatically start the motor to drain water according to the water level, and automatically shut down the motor when the water is drained, avoiding the situation where the cable is immersed in water for a long time; the motor can be manually started to pump water, and the operator can control the system through the background control terminal; when encountering extreme weather, the motor and the drainage ditch drain water together, reducing the possibility of the substation being flooded and causing the equipment to stop operating.

Description

Technical Field

[0001] The invention relates to the field of water level monitoring of a cable trench in a substation, and in particular to a water level monitoring and control system suitable for a cable trench in a substation. Background Art

[0002] The cables of the substation are laid on the angle steel frame on the side wall of the cable trench, at a certain height from the bottom of the cable trench, and covered with a cover plate on the top. At present, most substation cable trenches do not have water level monitoring devices installed, and are directly discharged outside the substation through the drainage ditch. In rainy seasons, if a large amount of rainwater enters the cable trench and is not discharged in time or the drainage is not smooth, it is easy to cause long-term water accumulation in the cable trench. The outer protective layer of the cable may be corroded and aged, causing the insulation of the DC system to decrease, affecting the safe operation of the equipment. At present, the water level of the cable trench cannot be monitored in the background. In this case, it is necessary to open the cover plate on site for inspection, and the pumping device cannot be started to drain the water. Instead, manual drainage or opening the cable trench cover plate to dry the water is used. Summary of the invention

[0003] The present invention solves the problem that the water level of a cable trench cannot be monitored and controlled in real time and provides a water level monitoring and control system suitable for a cable trench of a substation.

[0004] In order to achieve the above invention purpose, the technical solution adopted is:

[0005] A water level monitoring and control system suitable for a substation cable trench, characterized in that it includes a water level monitoring device, a background control terminal and a gear control circuit; wherein:

[0006] The water level monitoring device and the background control terminal are electrically connected to the gear control circuit respectively;

[0007] The water level monitoring device is used to monitor the water level, the gear control circuit is used to monitor the gear position and control the motor, and the background control terminal is used to display the gear position status.

[0008] In the above scheme, the water level monitoring device is used to detect the water level in real time. The water level information will be transmitted to the gear control circuit. The gear control circuit controls the pumping motor to drain water. The background control terminal displays the gear information and is used for direct operation and control by personnel.

[0009] The water level monitoring device comprises a float, a float column, a float beam, a spherical column, a spherical electrode, a gear electrode, a lead-out wire slot, a cylinder and a sealing cylinder cover; wherein:

[0010] The cylinder is arranged in the middle of the ring shape of the float, and the geometric center of the cylinder and the float are on a vertical line;

[0011] The sealing cylinder cover is arranged on the upper part of the cylinder; the number of the floating ring columns is 2, which are arranged vertically on the floating ring, and the two floating ring columns are arranged on both sides of the cylinder;

[0012] The upper parts of the two floating ring columns are fixedly connected by the floating ring cross beam;

[0013] A through hole is provided at the center of the sealing cylinder cover, and the ball column passes through the through hole, and the upper end of the ball column is fixed at the center of the floating ring beam;

[0014] The lower end of the ball column is fixedly connected to the spherical electrode; the lead-out wire groove is symmetrically arranged with respect to the center of the circle in the vertical direction of the inner wall of the cylinder;

[0015] The gear electrode is arranged on the lead-out wire slot;

[0016] The gear position control circuit is arranged on the inner wall of the cylinder, and the gear position electrode is electrically connected to the gear position control circuit.

[0017] In the above scheme, the ball column is connected to the spherical electrode, and the ball column is connected to the float ring through the float ring beam and the float ring column. The water level will make the float ring float, and the float ring will rise with the rise of water level, but the cylinder will not rise, and the spherical electrode will rise accordingly to contact electrodes at different gears.

[0018] The number of the gear electrodes is set to 6, 2 in a group, and they are symmetrically arranged on the lead-out wire slot with the center of a plane circle. The three groups of gear electrodes are arranged at equal intervals from bottom to top as a first gear electrode, a second gear electrode, and a third gear electrode.

[0019] The gear control circuit includes an operating power supply KM, a first fuse 1RD, a second fuse 2RD, an upward gear control circuit, a downward gear control circuit, a jump control circuit and a motor control circuit; wherein: the positive electrode of the operating power supply KM is electrically connected to one end of the first fuse 1RD, the other end of the first fuse 1RD is electrically connected to the input ends of the upward gear control circuit, the downward gear control circuit, the jump control circuit and the motor control circuit respectively, the output ends of the upward gear control circuit, the downward gear control circuit, the jump control circuit and the motor control circuit are electrically connected to one end of the second fuse 2RD respectively, and the other end of the second fuse 2RD is electrically connected to the negative electrode of the operating power supply KM; the upward gear control circuit and the downward gear control circuit are electrically connected to the first gear electrode, the second gear electrode and the third gear electrode respectively.

[0020] In the above scheme, the up gear control circuit, the down gear control circuit, the jump control circuit and the motor control circuit are the main circuits of the gear control circuit. The up gear control circuit and the down gear control circuit control the on and off of the motor, the jump control circuit performs jump detection on the entire circuit, and the motor control circuit directly controls the motor.

[0021] The upshift gear control circuit includes an upshift 3 gear circuit, an upshift 2 gear circuit and an upshift 1 gear circuit; wherein:

[0022] The 3-speed up circuit includes a normally open contact S13, a coil S13, an electrode switch K3, a normally closed contact QH, and an indicator light HD3; the other end of the first fuse 1RD is electrically connected to the normally open contact S13 and one end of the electrode switch K3 respectively, the other end of the normally open contact S13 and the electrode switch K3 are electrically connected to one end of the coil S13 respectively, the other end of the coil S13 is electrically connected to one end of the normally closed contact QH, the other end of the normally closed contact QH is electrically connected to the input end of the indicator light HD3, and the output end of the indicator light HD3 is electrically connected to one end of the second fuse 2RD;

[0023] The up 2-gear circuit includes a normally open contact S12, a coil S12, an electrode switch K2, a normally closed contact QH, a normally closed contact S13 and an indicator light HD2; the other end of the first fuse 1RD is electrically connected to the normally open contact S12 and one end of the electrode switch K2 respectively, the other end of the normally open contact S12 and the electrode switch K2 are electrically connected to one end of the coil S12 respectively, the other end of the coil S12 is electrically connected to one end of the normally closed contact QH, the other end of the normally closed contact QH is electrically connected to one end of the normally closed contact S13, the other end of the normally closed contact S13 is electrically connected to the input end of the indicator light HD2, and the output end of the indicator light HD2 is electrically connected to one end of the second fuse 2RD;

[0024] The up gear 1 circuit includes a normally open contact S11, a coil S11, an electrode switch K1, a normally closed contact QH, a normally closed contact S12 and an indicator light HD1; the other end of the first fuse 1RD is electrically connected to the normally open contact S11 and one end of the electrode switch K1 respectively, the other end of the normally open contact S11 and the electrode switch K1 are electrically connected to one end of the coil S11 respectively, the other end of the coil S11 is electrically connected to one end of the normally closed contact QH, the other end of the normally closed contact QH is electrically connected to one end of the normally closed contact S12, the other end of the normally closed contact S12 is electrically connected to the input end of the indicator light HD1, and the output end of the indicator light HD1 is electrically connected to one end of the second fuse 2RD.

[0025] The third gear electrode of the water level monitoring device is electrically connected to the electrode switch K3 of the gear control circuit, the second gear electrode of the water level monitoring device is electrically connected to the electrode switch K2 of the gear control circuit, and the first gear electrode of the water level monitoring device is electrically connected to the electrode switch K1 of the gear control circuit.

[0026] The downshift control circuit includes a downshift 3-gear circuit, a downshift 2-gear circuit and a downshift 1-gear circuit; wherein:

[0027] The downshift 3-gear circuit includes a normally open contact J23, a coil J23, an electrode switch K3, a normally open contact QH, a normally closed contact J22, and an indicator light LD3; the other end of the first fuse 1RD is electrically connected to the normally open contact J23 and one end of the electrode switch K3 respectively, the other end of the normally open contact J23 and the electrode switch K3 are electrically connected to one end of the coil J23 respectively, the other end of the coil J23 is electrically connected to one end of the normally open contact QH, the other end of the normally open contact QH is electrically connected to one end of the normally closed contact J22, the other end of the normally closed contact J22 is electrically connected to the input end of the indicator light LD3, and the output end of the indicator light LD3 is electrically connected to one end of the second fuse 2RD;

[0028] The downshift 2-gear circuit includes a normally open contact J22, a coil J22, an electrode switch K2, a normally open contact QH, a normally closed contact J21, and an indicator light LD2; the other end of the first fuse 1RD is electrically connected to the normally open contact J22 and one end of the electrode switch K2, respectively; the normally open contact J22 and the other end of the electrode switch K2 are electrically connected to one end of the coil J22, respectively; the other end of the coil J22 is electrically connected to one end of the normally open contact QH, the other end of the normally open contact QH is electrically connected to one end of the normally closed contact J21, the other end of the normally closed contact J21 is electrically connected to the input end of the indicator light LD2, and the output end of the indicator light LD2 is electrically connected to one end of the second fuse 2RD;

[0029] The downshift 1 gear circuit includes a normally open contact J21, a coil J21, an electrode switch K1, a normally open contact QH and an indicator light LD2; the other end of the first fuse 1RD is electrically connected to the normally open contact J21 and one end of the electrode switch K1 respectively, the other end of the normally open contact J21 and the electrode switch K1 are electrically connected to one end of the coil J21 respectively, the other end of the coil J21 is electrically connected to one end of the normally open contact QH, the other end of the normally open contact QH is electrically connected to the input end of the indicator light LD1, and the output end of the indicator light LD1 is electrically connected to one end of the second fuse 2RD.

[0030] The third gear electrode of the water level monitoring device is electrically connected to the electrode switch K3 of the gear control circuit, the second gear electrode of the water level monitoring device is electrically connected to the electrode switch K2 of the gear control circuit, and the first gear electrode of the water level monitoring device is electrically connected to the electrode switch K1 of the gear control circuit.

[0031] The jump control loop includes a loop resistor R, an indicator light TWD, a coil QH, a normally closed contact J21, a normally closed contact SF and a motor DJ; wherein: the other end of the first fuse 1RD is electrically connected to one end of the loop resistor R, the other end of the loop resistor R is electrically connected to the input end of the indicator light TWD, the output end of the indicator light TWD is electrically connected to one end of the coil QH, the other end of the coil QH is electrically connected to one end of the normally closed contact J21, the other end of the normally closed contact J21 is electrically connected to one end of the normally closed contact SF, the other end of the normally closed contact SF is electrically connected to the input end of the motor DJ, and the output end of the motor DJ is electrically connected to one end of the second fuse 2RD.

[0032] The motor control circuit includes a normally open contact S13, an indicator light HWD, a coil QH, a normally closed contact J21, a normally closed contact SF and a motor DJ; wherein: the other end of the first fuse 1RD is electrically connected to one end of the normally open contact S13, the other end of the normally open contact S13 is electrically connected to the input end of the indicator light HWD, the output end of the indicator light HWD is electrically connected to one end of the coil QH, the other end of the coil QH is electrically connected to one end of the normally closed contact J21, the other end of the normally closed contact J21 is electrically connected to one end of the normally closed contact SF, the other end of the normally closed contact SF is electrically connected to the input end of the motor DJ, and the output end of the motor DJ is electrically connected to one end of the second fuse 2RD.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The present invention provides a water level monitoring and control system suitable for a cable trench of a substation, which realizes real-time monitoring of the water level of the cable trench of the substation and displays it on a background monitoring terminal, thereby avoiding on-duty personnel from opening the cable trench to check the water level; the water level monitoring device and the gear control circuit can automatically start a motor to drain water according to the water level, and automatically stop the motor when the water in the cable trench is drained, thereby avoiding the situation where the cable is immersed in water for a long time and the protective layer is corroded; and the motor can be manually started to perform pumping operations, and the operator can control the system through the background control terminal; especially when encountering typhoons, rainstorms and extreme weather, the motor is automatically started to drain water together with the drainage ditch, which greatly reduces the possibility of equipment shutdown caused by substation site flooding. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A diagram of a device module of the invention;

[0036] Figure 2 It is a cross-sectional view of the water level monitoring device of the invention;

[0037] Figure 3 It is the upward gear control circuit diagram of the invention;

[0038] Figure 4 This is a downshift control circuit diagram of the invention;

[0039] Figure 5 It is the jump control loop diagram of the invention;

[0040] Figure 6 The motor control circuit diagram of the invention;

[0041] Figure 7 It is the manual closing circuit diagram of the invention;

[0042] Figure 8 It is the manual opening circuit diagram of the invention;

[0043] Fig. 9 This is a structural diagram of the water level monitoring device of the invention.

[0044] Description of Reference Numerals

[0045] 1. Water level monitoring device; 2. Backstage control terminal; 3. Shift control circuit; 11. Floating ring; 12. Floating ring column; 13. Floating ring beam; 14. Ball column; 15. Spherical electrode; 16. Shift electrode; 17. Lead-out wire trough; 18. Cylinder; 19. Sealing cylinder cover. DETAILED DESCRIPTION

[0046] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;

[0047] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0048] Example 1

[0049] like Figure 2 As shown, the water level monitoring device 1 includes a float 11, a float column 12, a float beam 13, a ball column 14, a spherical electrode 15, a gear electrode 16, a lead-out wire slot 17, a cylinder 18 and a sealing cylinder cover 19; wherein:

[0050] The cylinder 18 is arranged in the middle of the ring of the float 11, and the geometric center of the cylinder 18 and the float 11 are on a vertical line;

[0051] The sealing cylinder cover 19 is arranged on the upper part of the cylinder 18; the number of the floating ring columns 12 is 2, which are vertically arranged on the floating ring 11, and the two floating ring columns 12 are arranged on both sides of the cylinder 18;

[0052] The upper parts of the two floating ring columns 12 are fixedly connected by the floating ring cross beam 13;

[0053] A through hole is provided at the center of the sealing cylinder cover 19, and the ball column 14 passes through the through hole, and the upper end thereof is fixed at the center of the floating ring beam 13;

[0054] The lower end of the ball column 14 is fixedly connected to the spherical electrode 15; the lead-out wire groove 17 is symmetrically arranged on the inner wall of the cylinder 18 in the vertical direction and the center of the circle;

[0055] The gear electrode 16 is arranged on the lead-out wire slot 17;

[0056] The gear position control circuit 3 is disposed on the inner wall of the cylinder 18 , and the gear position electrode 16 is electrically connected to the gear position control circuit.

[0057] The number of the gear electrodes 16 is set to 6, 2 in a group, and they are symmetrically arranged on the lead-out wire groove 17 with the center of the plane circle. The three groups of gear electrodes 16 are arranged at equal intervals from bottom to top as the first gear electrode, the second gear electrode, and the third gear electrode.

[0058] Example 2

[0059] like Figure 3 As shown, when the water level in the cable trench is very low, the 1st gear electrode switch K1 is closed and turned on, the coil S11 is excited, and its normally open contact S11 is closed to form a self-holding circuit, that is, S11→coil S11→QH→S12→HD1 is turned on, and the red light HD1 is displayed on the background control panel. Before the water level rises from the 1st gear to the 2nd gear, the red light HD1 is always on. When the water level rises to the 2nd gear, the 2nd gear electrode switch K2 is closed and turned on, the coil S12 is excited, and its normally open contact S12 is closed to form a self-holding circuit, that is, S12→coil S12→QH→S13→HD2 is turned on, and the red light HD2 is on. At the same time, the normally closed contact S12 in S11→coil S11→QH→S12→HD1 is disconnected, the red light HD1 is extinguished, the coil S11 loses power, and its closed contact S11 returns to the normally open state. Before the water level rises from the 2nd gear to the 3rd gear, the red light HD2 is always on. When the water level rises to level 3, the level 3 electrode switch K3 is closed and turned on, coil S13 is energized, and its normally open contact S13 is closed to form a self-holding circuit, that is, S13→coil S13→QH→HD3 is turned on, and the red light HD3 is on. At the same time, the normally closed contact S13 in S12→coil S12→QH→S13→HD2 is disconnected, the red light HD2 is off, the coil S12 loses power, and its closed contact S12 returns to the normally open state.

[0060] Example 3

[0061] like Figure 4 As shown, K3 is in the closed state. Figure 3The normally open contact QH in the circuit is closed, the loop K3→coil J23→QH→J22→LD3 is turned on, the coil J23 is excited, and its normally open contact J23 is closed to form a self-holding loop J23→coil J23→QH→J22→LD3, and the green light is on. Before the water level drops from the 3rd gear to the 2nd gear, the green light LD3 is always on. When the water level drops to the 2nd gear, the 2nd gear electrode switch K2 is closed and turned on, the coil J22 is excited, and its normally open contact J22 is closed to form a self-holding loop J22→coil J22→QH→J21→LD2, and the green light LD2 is on. At the same time, the normally closed contact J22 in the J23→coil J23→QH→J22→LD3 loop is disconnected, the green light LD3 is extinguished, the coil J23 loses power, and its closed contact J23 returns to the normally open state. Before the water level drops from the 2nd gear to the 1st gear, the green light LD2 is always on. When the water level drops to the 1st gear, the 1st gear electrode switch K1 is closed and turned on, the coil J21 is energized, and its normally open contact J21 is closed to form a self-holding circuit J21→coil J21→QH→LD1, and the green light LD1 is on. At the same time, the normally closed contact J21 in the J22→coil J22→QH→J21→LD2 circuit is disconnected, the green light LD2 is off, the coil J22 loses power, and its closed contact J22 returns to the normally open state. The normally closed contact J21 of the pumping motor control circuit is disconnected, cutting off the circuit S13→HWD→QH→J21→SF→DJ, the pumping motor DJ stops pumping water, and the switching coil QH is demagnetized. Figure 3 All QH contacts in the water level rise position control circuit are returned to the normally open state, all water level rise position control circuits are disconnected, and the green light goes out. At this time, the 1st gear circuit S11→coil S11→QH→S12→HD1 in the water level rise position control circuit is turned on, the red light HD1 is on, and it returns to the initial state.

[0062] Example 4

[0063] like Figure 5 As shown, the loop resistor R→TWD→coil QH→J21→SF→DJ is the trip monitoring loop of the pumping motor DJ. The resistor R is very large, most of the voltage drops on the resistor R, the current in the loop is very small, QH is not enough for excitation, and the TWD light is on, indicating that the part of the pumping motor control loop QH→J21→SF→DJ is intact, and it also shows that the pumping motor DJ is in a trip state and does not start. When the part of the pumping motor control loop HWD→coil QH→J21→SF→DJ is connected to S13, SH contact, or SH switch at any point, the HWD light is on, indicating that the pumping motor is in the starting state. At this time, the loop resistor R→TWD is short-circuited, and the TWD light is off.

[0064] Example 5

[0065] like Figure 6As shown, the normally open contact S13 of the motor control circuit is closed, the circuit S13→HWD→QH→J21→SF→DJ is turned on, the pumping motor DJ starts to pump water, the closing position lamp HWD lights up, and the switching coil QH is excited. Figure 5 All the normally closed contacts QH in the system are disconnected, all the water level rising position control circuits are disconnected, and the red light goes out.

[0066] Example 6

[0067] like Figure 7 and Figure 8 As shown, switches SH and SF represent the manual closing button and the manual opening button respectively. When switch SH is pressed, the circuit of switch SH→coil SH→HWD→coil QH→J21→SF→DJ is turned on, coil SH is energized, and its normally open contact SH is closed to form a self-holding circuit, that is, the contact SH→coil SH→HWD→coil QH→J21→SF→DJ is turned on, and the pumping motor DJ is started. The manual closing switch SH is used to start pumping when the manual or automatic pumping start contact S13 fails. When switch SF is pressed, Figure 7 The middle switch SF→coil SF circuit is turned on and excited. Figure 6 The normally closed contact SF of the pumping motor control circuit is disconnected, cutting off the motor DJ circuit and stopping the motor DJ in an emergency. The manual opening switch SF is used to stop pumping when the manual or automatic pumping stop contact J21 fails.

[0068] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A water level monitoring and control system suitable for a substation cable trench, characterized in that: It comprises a water level monitoring device (1), a background control terminal (2) and a gear control circuit (3); wherein: The water level monitoring device (1) and the background control terminal (2) are electrically connected to the gear control circuit (3) respectively; The water level monitoring device (1) is used to monitor the water level, the gear control circuit (3) is used to monitor the gear position and control the motor, and the background control terminal (2) is used to display the gear position status; The water level monitoring device (1) comprises a float (11), a float column (12), a float beam (13), a spherical column (14), a spherical electrode (15), a gear electrode (16), a lead-out wire slot (17), a cylinder (18) and a sealing cylinder cover (19); wherein: The cylinder (18) is arranged in the middle of the annular portion of the float ring (11), and the geometric centers of the cylinder (18) and the float ring (11) are on a vertical line; The sealing cylinder cover (19) is arranged on the upper part of the cylinder (18); the number of the floating ring columns (12) is 2, which are arranged vertically on the floating ring (11), and the two floating ring columns (12) are arranged on both sides of the cylinder (18); The upper parts of the two floating ring columns (12) are fixedly connected via the floating ring cross beam (13); A through hole is provided at the center of the sealing cylinder cover (19), the ball column (14) passes through the through hole, and the upper end of the ball column (14) is fixed to the center of the floating ring beam (13); The lower end of the spherical column (14) is fixedly connected to the spherical electrode (15); the lead-out wire groove (17) is provided symmetrically with respect to the center of the cylinder (18) in the vertical direction of the inner wall of the cylinder (18); The gear electrode (16) is arranged on the lead-out wire slot (17); The gear position control circuit (3) is arranged on the inner wall of the cylinder (18), and the gear position electrode (16) is electrically connected to the gear position control circuit (3); The number of the gear electrodes (16) is set to 6, 2 in a group, and symmetrically arranged on the lead-out wire slot (17) with the plane circle center, and the three groups of gear electrodes (16) are arranged at equal intervals from bottom to top to form a first gear electrode, a second gear electrode, and a third gear electrode; The gear control circuit (3) comprises an operating power supply KM, a first fuse 1RD, a second fuse 2RD, an upward gear control circuit, a downward gear control circuit, a jump control circuit and a motor control circuit; wherein: the positive electrode of the operating power supply KM is electrically connected to one end of the first fuse 1RD, the other end of the first fuse 1RD is electrically connected to the input ends of the upward gear control circuit, the downward gear control circuit, the jump control circuit and the motor control circuit respectively, the output ends of the upward gear control circuit, the downward gear control circuit, the jump control circuit and the motor control circuit are electrically connected to one end of the second fuse 2RD respectively, and the other end of the second fuse 2RD is electrically connected to the negative electrode of the operating power supply KM; the upward gear control circuit and the downward gear control circuit are electrically connected to the first gear electrode, the second gear electrode and the third gear electrode respectively; The upshift gear control circuit includes an upshift 3 gear circuit, an upshift 2 gear circuit and an upshift 1 gear circuit; wherein: The 3-speed up circuit includes a normally open contact S13, a coil S13, an electrode switch K3, a normally closed contact QH and an indicator light HD3; the other end of the first fuse 1RD is electrically connected to the normally open contact S13 and one end of the electrode switch K3 respectively, the other end of the normally open contact S13 and the electrode switch K3 are electrically connected to one end of the coil S13 respectively, the other end of the coil S13 is electrically connected to one end of the normally closed contact QH, the other end of the normally closed contact QH is electrically connected to the input end of the indicator light HD3, and the output end of the indicator light HD3 is electrically connected to one end of the second fuse 2RD; The up 2-gear circuit includes a normally open contact S12, a coil S12, an electrode switch K2, a normally closed contact QH, a normally closed contact S13 and an indicator light HD2; the other end of the first fuse 1RD is electrically connected to the normally open contact S12 and one end of the electrode switch K2 respectively, the other end of the normally open contact S12 and the electrode switch K2 are electrically connected to one end of the coil S12 respectively, the other end of the coil S12 is electrically connected to one end of the normally closed contact QH, the other end of the normally closed contact QH is electrically connected to one end of the normally closed contact S13, the other end of the normally closed contact S13 is electrically connected to the input end of the indicator light HD2, and the output end of the indicator light HD2 is electrically connected to one end of the second fuse 2RD; The up-gear 1st gear circuit includes a normally open contact S11, a coil S11, an electrode switch K1, a normally closed contact QH, a normally closed contact S12 and an indicator light HD1; the other end of the first fuse 1RD is electrically connected to the normally open contact S11 and one end of the electrode switch K1 respectively, the other end of the normally open contact S11 and the electrode switch K1 are electrically connected to one end of the coil S11 respectively, the other end of the coil S11 is electrically connected to one end of the normally closed contact QH, the other end of the normally closed contact QH is electrically connected to one end of the normally closed contact S12, the other end of the normally closed contact S12 is electrically connected to the input end of the indicator light HD1, and the output end of the indicator light HD1 is electrically connected to one end of the second fuse 2RD; The third gear electrode of the water level monitoring device (1) is electrically connected to the electrode switch K3 of the gear control circuit (3), the second gear electrode of the water level monitoring device (1) is electrically connected to the electrode switch K2 of the gear control circuit (3), and the first gear electrode of the water level monitoring device (1) is electrically connected to the electrode switch K1 of the gear control circuit (3); The downshift control circuit includes a downshift 3-gear circuit, a downshift 2-gear circuit and a downshift 1-gear circuit; wherein: The downshift 3-gear circuit includes a normally open contact J23, a coil J23, an electrode switch K3, a normally open contact QH, a normally closed contact J22 and an indicator light LD3; the other end of the first fuse 1RD is electrically connected to the normally open contact J23 and one end of the electrode switch K3 respectively, the other end of the normally open contact J23 and the electrode switch K3 are electrically connected to one end of the coil J23 respectively, the other end of the coil J23 is electrically connected to one end of the normally open contact QH, the other end of the normally open contact QH is electrically connected to one end of the normally closed contact J22, the other end of the normally closed contact J22 is electrically connected to the input end of the indicator light LD3, and the output end of the indicator light LD3 is electrically connected to one end of the second fuse 2RD; The downshift 2-gear circuit includes a normally open contact J22, a coil J22, an electrode switch K2, a normally open contact QH, a normally closed contact J21 and an indicator light LD2; the other end of the first fuse 1RD is electrically connected to the normally open contact J22 and one end of the electrode switch K2, respectively; the other end of the normally open contact J22 and the electrode switch K2 are electrically connected to one end of the coil J22, respectively; the other end of the coil J22 is electrically connected to one end of the normally open contact QH, the other end of the normally open contact QH is electrically connected to one end of the normally closed contact J21, the other end of the normally closed contact J21 is electrically connected to the input end of the indicator light LD2, and the output end of the indicator light LD2 is electrically connected to one end of the second fuse 2RD; The downshift 1 gear circuit includes a normally open contact J21, a coil J21, an electrode switch K1, a normally open contact QH and an indicator light LD2; the other end of the first fuse 1RD is electrically connected to the normally open contact J21 and one end of the electrode switch K1 respectively, the other end of the normally open contact J21 and the electrode switch K1 are electrically connected to one end of the coil J21 respectively, the other end of the coil J21 is electrically connected to one end of the normally open contact QH, the other end of the normally open contact QH is electrically connected to the input end of the indicator light LD1, and the output end of the indicator light LD1 is electrically connected to one end of the second fuse 2RD.

2. A water level monitoring and control system suitable for a substation cable trench according to claim 1, characterized in that: The third gear electrode of the water level monitoring device (1) is electrically connected to the electrode switch K3 of the gear control circuit (3), the second gear electrode of the water level monitoring device (1) is electrically connected to the electrode switch K2 of the gear control circuit (3), and the first gear electrode of the water level monitoring device (1) is electrically connected to the electrode switch K1 of the gear control circuit (3).

3. A water level monitoring and control system suitable for a substation cable trench according to claim 1, characterized in that: The jump control loop includes a loop resistor R, an indicator light TWD, a coil QH, a normally closed contact J21, a normally closed contact SF and a motor DJ; wherein: the other end of the first fuse 1RD is electrically connected to one end of the loop resistor R, the other end of the loop resistor R is electrically connected to the input end of the indicator light TWD, the output end of the indicator light TWD is electrically connected to one end of the coil QH, the other end of the coil QH is electrically connected to one end of the normally closed contact J21, the other end of the normally closed contact J21 is electrically connected to one end of the normally closed contact SF, the other end of the normally closed contact SF is electrically connected to the input end of the motor DJ, and the output end of the motor DJ is electrically connected to one end of the second fuse 2RD.

4. A water level monitoring and control system suitable for a substation cable trench according to claim 1, characterized in that: The motor control circuit includes a normally open contact S13, an indicator light HWD, a coil QH, a normally closed contact J21, a normally closed contact SF and a motor DJ; wherein: the other end of the first fuse 1RD is electrically connected to one end of the normally open contact S13, the other end of the normally open contact S13 is electrically connected to the input end of the indicator light HWD, the output end of the indicator light HWD is electrically connected to one end of the coil QH, the other end of the coil QH is electrically connected to one end of the normally closed contact J21, the other end of the normally closed contact J21 is electrically connected to one end of the normally closed contact SF, the other end of the normally closed contact SF is electrically connected to the input end of the motor DJ, and the output end of the motor DJ is electrically connected to one end of the second fuse 2RD.

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