Grounding continuity testing device of underwater equipment

Abstract

The utility model discloses a grounding continuity testing device for underwater equipment, comprising an overwater power supply part which comprises a switching power supply, a relay group, a coupling instrument and an insulation tester; the underwater equipment part comprises at least three underwater equipment cabins which are sequentially connected in series, and the underwater equipment cabins are configured to be capable of loading a plurality of electric equipment; the cathode of the switching power supply is connected to the protective grounding wire end of the underwater equipment cabin, and the anode is connected to the protective grounding wire end of the underwater equipment cabin through the relay group; the first relay is configured to close the contact after the switching power supply is powered on, so that the contact of the second relay is closed, and the contact is disconnected while the contact of the second relay is closed; a first port of the insulation tester is connected to a phase line end of the underwater equipment cabin closest to the overwater power supply part through the coupler, and a second port of the insulation tester is connected to a protection grounding wire end of the underwater equipment cabin closest to the overwater power supply part. According to the invention, the grounding continuity of the underwater equipment can be detected in real time.

Description

Technical Field

[0001] The utility model relates to the technical field of marine instrument equipment testing, in particular to a grounding continuity testing device for underwater equipment. Background Art

[0002] In the current technical solution, LIM1 (insulation tester) is connected to the phase line via VOC1 (coupler) to detect the insulation resistance value between the phase line and the ground. When insulation breakdown and grounding occur at point A, the insulation detector can discover and alarm. However, in the underwater operation environment, the situation is complex and changeable. For example, if the PE ground wire is disconnected at point B due to various unpredictable reasons, and insulation breakdown occurs at point A at this time, the detection circuit of LIM1 (insulation tester) will be interrupted. At this time, the insulation value displayed by the insulation tester will become infinite, and no alarm signal can be generated.

[0003] In the research and practice of the prior art, the inventors of the present application found that currently, underwater equipment generally adopts high-voltage circuits, and the existing technology only conducts grounding continuity detection before the equipment leaves the factory. After the equipment leaves the factory and during underwater operation, detection is basically no longer carried out. However, the working conditions faced by underwater operations are extremely complex, and it is entirely possible for the PE ground wire to be disconnected. This technical means of only detecting before leaving the factory obviously cannot meet the actual needs, has serious potential safety hazards, and is difficult to ensure the safety of underwater equipment during operation. For example, in some complex underwater construction projects, the equipment is in a harsh environmental condition for a long time, and factors such as mechanical vibration and seawater corrosion may cause circuit failures. However, the existing technology cannot detect these potential dangers in a timely and effective manner. Once insulation problems occur and are not detected, serious electrical accidents may be triggered, posing a huge threat to the equipment and personnel. Summary of the Utility Model

[0004] The technical problem to be solved by the present application is to overcome the deficiencies of the prior art and provide a grounding continuity testing device for underwater equipment to solve the above problems of the prior art and realize real-time detection of the grounding continuity of underwater equipment.

[0005] The present application provides a grounding continuity testing device for underwater equipment, including:

[0006] An on-water power supply part, including a switching power supply, a relay group, a coupler, and an insulation tester;

[0007] The underwater equipment part, including at least three underwater equipment cabins arranged in series in sequence, and the underwater equipment cabins are configured to be able to load a number of electrical equipment;

[0008] The negative pole of the switching power supply is connected to the protective grounding wire terminal of the underwater equipment cabin closest to the water-based power supply part, and the positive pole of the switching power supply is connected to the protective grounding wire terminal of the underwater equipment cabin farthest from the water-based power supply part through the relay group; wherein, the relay group includes a first relay and a second relay, and the first relay is configured to close the contact after the switching power supply is powered on, thereby prompting the contact of the second relay to close, and disconnecting the contact while the contact of the second relay is closed;

[0009] The first port of the insulation tester is connected to the phase wire terminal of the underwater equipment cabin closest to the water-based power supply part through the coupler, and the second port of the insulation tester is connected to the protective grounding wire terminal of the underwater equipment cabin closest to the water-based power supply part.

[0010] In a possible implementation manner, the output end of the switching power supply is connected to both ends of the coil of the first relay, a wire is led out from the normally open contact of the first relay and connected to one end of the coil of the second relay, and at the same time the other end of the coil of the second relay is connected to the output end of the switching power supply, and then the normally open contact of the second relay is connected to the underwater equipment part.

[0011] In a possible implementation manner, the underwater equipment part includes a first underwater equipment cabin, a second underwater equipment cabin, and a third underwater equipment cabin that are exactly the same and are configured in series, and the protective grounding wire terminals of the first underwater equipment cabin and the second underwater equipment cabin are connected and grounded.

[0012] In a possible implementation manner, the 24V voltage output from the positive pole of the switching power supply sequentially passes through the second relay, the third underwater equipment cabin, the second underwater equipment cabin, and the first underwater equipment cabin, and finally returns to the negative pole of the switching power supply, thereby forming an electrical circuit.

[0013] In a possible implementation manner, the insulation tester is a POD insulation tester, and the test range is from 0.01 MΩ to 2000 MΩ.

[0014] In a possible implementation manner, the coupler is a coupler with an adjustable voltage transformation ratio, and the voltage transformation ratio is from 100:1 to 1000:1.

[0015] In a possible implementation manner, the switching power supply is any one of LS25-24B24, S8FS-C2024, or NDR-240-24.

[0016] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0017] A grounding continuity testing device for an underwater device of the present application connects the positive pole of the switching power supply of the above-water power supply part to the protective grounding wire terminal of the underwater device cabin through a relay group. The relay group includes a first relay and a second relay. The first relay is configured to close the contact after the switching power supply is powered on, thereby prompting the contact of the second relay to close, and disconnecting the contact while the contact of the second relay is closed. The first port of the insulation tester is connected to the phase wire terminal of the underwater device cabin closest to the above-water power supply part through a coupler, and the second port of the insulation tester is connected to the protective grounding wire terminal of the underwater device cabin closest to the above-water power supply part. Based on this, the present application can realize real-time detection of the grounding continuity of the underwater device.

[0018] These features and advantages of the present application will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0020] Figure 1 Schematic diagram of the circuit principle of the grounding continuity testing device for an underwater device in the prior art;

[0021] Figure 2 Schematic diagram of the circuit principle of the grounding continuity testing device for an underwater device in the prior art;

[0022] Figure 3 Schematic diagram of the principle of the grounding continuity testing device for an underwater device provided by an embodiment of the present application;

[0023] Figure 4 Schematic diagram of forming an electrical loop provided by an embodiment of the present application;

[0024] Figure 5 Schematic diagram of a problem with grounding continuity provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] In the prior art, as Figure 1 shown, the LIM1 (insulation tester) is connected to the phase line through the VOC1 (coupler). When insulation breakdown and grounding occur at point A, the insulation detector can detect a decrease in the insulation resistance value between the phase line and the ground, thereby triggering an alarm. As Figure 2 shown, if the PE ground wire is disconnected at point B for various reasons and insulation breakdown occurs at point A, the detection circuit of the LIM1 (insulation tester) will be disconnected. At this time, the insulation value measured by the insulation tester will be infinite, so no alarm signal will be generated. Underwater equipment uses high-voltage circuits. Once insulation problems occur and cannot be detected, it will pose a danger.

[0027] The following specifically describes a grounding continuity test device for an underwater equipment provided by the present application in conjunction with the accompanying drawings.

[0028] A grounding continuity test device for an underwater equipment, comprising: a water supply power part, including a switching power supply, a relay group, a coupler and an insulation tester; the underwater equipment part, including at least three underwater equipment cabins arranged in series in sequence, and the underwater equipment cabins are configured to be able to load a number of electrical equipment; the negative pole of the switching power supply is connected to the protective grounding wire end of the underwater equipment cabin closest to the water supply power part, and the positive pole of the switching power supply is connected to the protective grounding wire end of the underwater equipment cabin farthest from the water supply power part through the relay group; wherein, the relay group includes a first relay and a second relay, and the first relay is configured to close the contact after the switching power supply is powered on, so as to prompt the contact of the second relay to close, and disconnect the contact while the contact of the second relay is closed; the first port of the insulation tester is connected to the phase line end of the underwater equipment cabin closest to the water supply power part through the coupler, and the second port of the insulation tester is connected to the protective grounding wire end of the underwater equipment cabin closest to the water supply power part.

[0029] In a possible implementation manner, the output end of the switching power supply is connected to both ends of the coil of the first relay, a wire is led out from the normally open contact of the first relay and connected to one end of the coil of the second relay, and at the same time the other end of the coil of the second relay is connected to the output end of the switching power supply, and then the normally open contact of the second relay is connected to the underwater equipment part.

[0030] For example, for the first relay (Relay1) and the second relay (Relay2), a simple wiring schematic diagram of the relay group is as follows:

[0031] Switching power supply --- [+] Coil of the first relay (Relay1) [-] --- Ground;

[0032] Normally open contact (NO) of the first relay (Relay1) ---[+] Coil of the second relay (Relay2) [-] --- Ground;

[0033] Normally open contact (NO) of the second relay (Relay2) ---[+] Load [-] --- Ground;

[0034] When the switched-mode power supply is powered on, current flows through the coil of Relay1 to close its contacts, thereby energizing the coil of Relay2, closing its contacts as well, and the load starts to work. Meanwhile, the contacts of Relay1 open.

[0035] In a possible implementation, the underwater equipment part includes a first underwater equipment compartment, a second underwater equipment compartment, and a third underwater equipment compartment that are exactly the same and in series configuration. The protective ground wire end of the first underwater equipment compartment is connected to the protective ground wire end of the second underwater equipment compartment and grounded.

[0036] For example, the overall shape of the underwater equipment compartment can be cylindrical, cuboid, spherical, or other unique geometric shapes. For instance, the underwater equipment compartment adopts a cylindrical design with hemispherical heads at both ends to reduce water flow resistance; the compartment body is made of titanium alloy, having excellent corrosion resistance and compressive strength, and can maintain structural integrity in the deep-sea environment; a sealing method combining multiple sealing rings and sealants is adopted to form a reliable waterproof barrier at the hatch and interfaces; a special equipment mounting rack is provided inside, with anti-vibration fixing devices to ensure the stability of the equipment during underwater operation; the wiring is neat and orderly, separated from the equipment through isolation grooves to avoid interference. Meanwhile, the heat dissipation channels are reasonably designed to utilize the flow of seawater for natural cooling; multiple watertight interfaces are equipped outside the compartment body, including power interfaces, data transmission interfaces, and sensor interfaces, all using standard underwater connectors to ensure the reliability and stability of the connections.

[0037] In a possible implementation, the 24V voltage output from the positive pole of the switched-mode power supply sequentially passes through the second relay, the third underwater equipment compartment, the second underwater equipment compartment, the first underwater equipment compartment, and finally returns to the negative pole of the switched-mode power supply, thus forming an electrical circuit.

[0038] Such as Figure 3-4As shown, PSU1 is a 24V switching power supply, LIM1 is an insulation detector, VOC1 is a coupler (used to convert the high voltage of the bus into a low voltage), K423 and K453 are the first relay and the second relay respectively; PSU1 - 3 are underwater equipment cabins (used to install electrical equipment underwater). After the PSU1 switching power supply is powered on, make the K423 relay close. The +24V power supply of the PSU1 switching power supply sequentially passes through the coil of K453 --> PDU3 --> PDU2 --> PDU1 --> the negative pole of PSU1 along the arrow direction, forming an electrical circuit. When there is no break in the entire circuit, the coil of the K453 relay closes, and the contacts of K453 close, making the contacts of K423 open. At this time, since K453 has formed a self - locking circuit, K453 remains closed. When the system receives the closing signal of K453, it indicates that its grounding connectivity is good.

[0039] As Figure 5 shown, when there is a problem with the grounding continuity between PDU1 and PDU2, such as a break at point B, when K423 is made to close, the +24V of PSU1 is disconnected at point B and no path can be formed, and K453 cannot close. Therefore, the system receives the open state of K453 and issues an alarm signal. This circuit can be detected in real - time whether the bus is charged or not.

[0040] It can be understood that L1, L2, and L3 usually represent the three live wires in a three - phase power supply, also known as phase wires. Three - phase electricity is generally used in industry and high - power equipment. There is a phase difference between the three phases, and the voltage and current change periodically, which can provide a more stable and powerful power supply. PE represents the protective grounding wire, which is used to connect the conductive parts such as the metal shell of the equipment to the ground to prevent electric shock to personnel when the equipment leaks electricity.

[0041] In a possible implementation manner, the insulation tester is a POD insulation tester, and the test range is from 0.01MΩ to 2000MΩ.

[0042] For example, the POD insulation detector is a device used to detect the insulation performance of an electrical system. It can monitor the AC and DC voltages, insulation status, grounding circuit, etc. of the system in real - time and issue an alarm when an abnormality occurs.

[0043] In this embodiment, the POD insulation detector has the following functions:

[0044] Real - time monitoring: It can monitor the voltage of the system bus to the ground in real - time, including system voltage, positive - to - ground voltage, negative - to - ground voltage, and AC cross - leakage voltage, etc.;

[0045] Insulation monitoring: It monitors the impedance of the system bus to the ground in real - time and issues an alarm when the imbalance between the positive and negative voltages to the ground exceeds a preset value;

[0046] Grounding Detection: Intelligently analyze the grounding status through pattern matching technology, accurately judge the grounding loop, and calculate the grounding impedance;

[0047] Current Diagnosis: Collect loop current signals to help operation and maintenance personnel understand the DC system status and troubleshoot faults;

[0048] Insulation Early Warning: Detect the impedance to ground of ungrounded loops, judge their long-term change trends, and provide early warning information for loop grounding;

[0049] Historical Records: Automatically save the AC current leakage and grounding records of the system, including information such as date and time, grounding impedance, current leakage voltage, grounding loop, etc.;

[0050] Voltage Balance Function: When the ratio of the voltages of the positive and negative busbars of the DC system to ground exceeds a certain range, restore the voltage of the DC system to ground to a balanced state;

[0051] Input / Output Interface: Usually has multiple groups of LED system status displays, communication status displays, built-in buzzer alarms, multiple YX digital output interfaces, and communication interfaces such as RS485.

[0052] Taking the PM2J insulation monitoring unit as an example, its partial parameters:

[0053] Power Supply Voltage: 80Vdc - 320Vdc;

[0054] Voltage Measurement Accuracy: 0.5%;

[0055] Resistance Measurement Accuracy: 5%;

[0056] Number of Measured Branch Circuits: 60;

[0057] Communication Port: Isolated RS485 communication;

[0058] Can provide 30-way shunt insulation resistance detection function, measuring the positive and negative resistances to ground of the measured branch output;

[0059] Detect the voltages of the busbars (combined busbar, control busbar) to ground;

[0060] The number of monitored combined busbar circuits can be set (5-way, 10-way, 15-way optional);

[0061] The grounding resistance alarm value is set by the main monitor through RS485;

[0062] Transmit the detected information to the main monitor through the RS485 serial interface, as the basis for the main monitor to manage the power system and handle fault alarms;

[0063] Installation Dimensions: 140mm × 82mm, fixed with M3 screws.

[0064] In a possible implementation manner, the coupler is a coupler with an adjustable voltage transformation ratio, and the voltage transformation ratio is from 100:1 to 1000:1.

[0065] In this embodiment, the coupler can be any one of Siemens 8DJH series couplers, ABB VSC series couplers, and Schneider RM6 series couplers.

[0066] In a possible implementation manner, the switching power supply is any one of LS25-24B24, S8FS-C2024, or NDR-240-24.

[0067] For example, the selection of the specific model of the switching power supply also needs to be determined according to the specific requirements of the test equipment, such as factors like power, accuracy, and size. At the same time, the switching power supply for underwater equipment also needs to have good waterproof and moisture-proof performance and comply with relevant safety standards. Among them, a 24-volt switching power supply suitable for the ground continuity test of underwater equipment, for example:

[0068] Jin Shengyang LS25-24B24: It has high efficiency, high reliability, and good electromagnetic compatibility.

[0069] Omron S8FS-C2024: It can work stably within a relatively wide temperature range.

[0070] Mean Well NDR-240-24: The output is stable and it has a perfect overload protection function.

[0071] From the above technical solutions, it can be seen that the embodiments of the present application have the following advantages:

[0072] For a ground continuity test device of an underwater equipment in the present application, the positive pole of the switching power supply in the water supply part is connected to the protective ground wire end of the underwater equipment cabin through a relay group. The relay group includes a first relay and a second relay. The first relay is configured to close the contact after the switching power supply is powered on, thereby prompting the contact of the second relay to close, and disconnect the contact while the contact of the second relay is closed. The first port of the insulation tester is connected to the phase wire end of the underwater equipment cabin closest to the water supply part through a coupler, and the second port of the insulation tester is connected to the protective ground wire end of the underwater equipment cabin closest to the water supply part. Based on this, the present application can realize real-time detection of the ground continuity of the underwater equipment.

[0073] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A ground continuity test device for underwater equipment, characterized in that: include: The water power supply part includes the switching power supply, relay group, coupling instrument and insulation tester; The underwater equipment part includes at least three underwater equipment compartments arranged in series, and the underwater equipment compartments are configured to carry a number of electrical equipment; The negative pole of the switching power supply is connected to the protective grounding terminal of the underwater equipment compartment closest to the above-water power supply part, and the positive pole of the switching power supply is connected to the protective grounding terminal of the underwater equipment compartment farthest from the above-water power supply part through the relay group; wherein the relay group includes a first relay and a second relay, and the first relay is configured to close the contact after the switching power supply is powered on, thereby prompting the contact of the second relay to close, and disconnect the contact while the contact of the second relay is closed; The first port of the insulation tester is connected to the phase line terminal of the underwater equipment compartment closest to the above-water power supply part through the coupler, and the second port of the insulation tester is connected to the protective grounding line terminal of the underwater equipment compartment closest to the above-water power supply part.

2. The ground continuity test device for underwater equipment according to claim 1, characterized in that: The output end of the switching power supply is connected to both ends of the coil of the first relay, a wire is led out from the normally open contact of the first relay and connected to one end of the coil of the second relay, and the other end of the coil of the second relay is connected to the output end of the switching power supply, and then the normally open contact of the second relay is connected to the underwater equipment part.

3. The ground continuity test device for underwater equipment according to claim 1, characterized in that: The underwater equipment part includes a first underwater equipment compartment, a second underwater equipment compartment and a third underwater equipment compartment which are completely identical and arranged in series, and a protective ground wire terminal of the first underwater equipment compartment and a protective ground wire terminal of the second underwater equipment compartment are connected and grounded.

4. The ground continuity test device for underwater equipment according to claim 3, characterized in that: The 24V voltage outputted from the positive pole of the switching power supply passes through the second relay, the third underwater equipment compartment, the second underwater equipment compartment, and the first underwater equipment compartment in sequence, and finally flows back to the negative pole of the switching power supply, thereby forming an electrical circuit.

5. The ground continuity test device for underwater equipment according to claim 1, characterized in that: The insulation tester is a POD insulation tester with a test range of 0.01MΩ to 2000MΩ.

6. The ground continuity test device for underwater equipment according to claim 1, characterized in that: The coupling instrument is a coupling instrument with an adjustable voltage ratio, and the voltage ratio is 100:1 to 1000:

1.

7. The ground continuity test device for underwater equipment according to claim 1, characterized in that: The switching power supply is any one of LS25-24B24, S8FS-C2024 or NDR-240-24.

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