CN210835137U

CN210835137U - Ship insulation monitoring and fault positioning system

Info

Publication number: CN210835137U
Application number: CN201921583457.4U
Authority: CN
Inventors: 邵忠辉; 包涵; 郭武彬
Original assignee: Zhejiang Xinya Electric Co ltd
Current assignee: Zhejiang Xinya Electric Co ltd
Priority date: 2019-09-23
Filing date: 2019-09-23
Publication date: 2020-06-23
Anticipated expiration: 2029-09-23

Abstract

The utility model relates to a boats and ships insulation monitoring and fault location system, it includes: acquiring an insulation value according to the monitored leakage current value, and injecting a low-frequency alternating current signal between the power grid and the earth pole when the insulation value is lower than a set value; the branch positioning modules are connected with the load, are in communication connection with the insulation monitoring device, and are used for detecting low-frequency alternating-current signals injected by the insulation monitoring device, detecting faulted branches and sending the branches to the insulation detecting device; terminal, with insulating monitoring devices communication connection, carry out audible-visual alarm according to the insulation value who acquires, branch road orientation module is including the fault locator who is used for the fault location branch road and the annular current transformer who is used for detecting insulating monitoring devices injection signal, the utility model has the advantages of it is following: under the condition that the branch load is disconnected with the bus, the insulation value of the corresponding load loop can be monitored in real time; the structure is clear and simple, the installation and the use are rapid and convenient, and the operation is stable and reliable.

Description

Ship insulation monitoring and fault positioning system

Technical Field

The utility model belongs to the technical field of automated inspection, concretely relates to insulating monitoring of boats and ships and fault location system.

Background

The ship power system is an independent special system, and the ship specification strictly requires the reliability and continuity of the power supply of a ship power grid, so the IT grounding system is the most suitable grounding system for the ship.

Characteristics of the IT grounding system: the transformer secondary side neutral point is not grounded or grounded via a high impedance and the consumer enclosure is grounded as shown in fig. 1.

This grounding system is not grounded due to its power neutral point, and when the first point of the load end is in an insulation fault, the current does not form a loop through the transformer neutral point (no electrical loop is formed to the ground, as shown in fig. 2). When the device shell is contacted, the voltage cannot cause damage to a human body, the fault current is very small, and only a very small capacitive leakage current can be generated. On the premise of not endangering human bodies and equipment, the equipment allows a small leakage current to be grounded, the normal work of the equipment is not influenced, and the protection device does not act. Therefore, the IT grounding system can ensure the continuity of power supply well, and is mainly applied to places with high requirements on the continuity of power supply.

But when the fault occurs again, the phase-to-phase short circuit is caused and the protection device is triggered to act, so that the power supply continuity is damaged. Thus, the faulty circuit must be able to be detected and repaired before a second fault occurs. According to the specification, an IT system must be provided with an insulation monitoring and grounding fault alarm device to remind a maintenance worker of insulation fault occurrence and timely position a fault branch so as to find out problems in time, remove faults and prevent the power supply of the IT system from being cut off when the power supply is subjected to secondary out-of-phase grounding fault.

The ship sailing environment is complex, and the severe environment seriously damages the power equipment on the ship. The erosion of seawater, the deterioration of climate and the influence of air humidity on the erosion of the insulating layer of a power supply system on a ship are serious, and the failure rate of the insulating layer on a power grid branch is increased. How to quickly and accurately position the fault of the insulating layer of the marine power system relates to the safety of the whole navigation, so that the installation of a set of intelligent and high-instantaneity insulating monitoring and positioning device is particularly important for the safety of ships.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide an insulating monitoring of boats and ships and fault location system.

In order to achieve the above purpose, the utility model provides a following technical scheme: a vessel insulation monitoring and fault locating system, comprising:

the insulation monitoring device is used for acquiring an insulation value according to the monitored leakage current value and injecting a low-frequency alternating current signal between the power grid and the earth pole when the insulation value is lower than a set value;

the branch positioning modules are connected with the load, are in communication connection with the insulation monitoring device, and are used for detecting low-frequency alternating-current signals injected by the insulation monitoring device, detecting faulted branches and sending the branches to the insulation detecting device;

the terminal is in communication connection with the insulation monitoring device and performs sound-light alarm according to the obtained insulation value,

the branch positioning module comprises a fault positioner for positioning a fault branch and a ring current transformer for detecting an injection signal of the insulation monitoring device.

The insulation monitoring device is in communication connection with the acquisition server, and the acquisition server is in communication connection with the branch positioning module.

The branch circuit positioning modules are all provided with circuit breakers.

The terminal comprises a computer.

The computer is also provided with a touch screen.

The computer is provided with an alarm database for recording alarm information.

The low frequency ac signal is 2.5 Hz.

The utility model has the advantages that:

1. displaying the local insulation resistance value;

2. displaying the leakage current value of the detected power grid;

3. recording an alarm with a time mark, and inquiring an alarm record;

4. fault branch positioning;

5. under the condition that the branch load is disconnected with the bus, the insulation value of the corresponding load loop can be monitored in real time;

6. the system adopts a 485 bus and a standard Modbus protocol to exchange data among devices, so that the communication and integration with other systems are facilitated;

7. the structure is clear and simple, the installation and the use are rapid and convenient, and the operation is stable and reliable.

Drawings

FIG. 1 is a schematic diagram of an IT system.

Fig. 2 is a schematic diagram of a primary fault of the IT grounding system.

Fig. 3 is a schematic diagram of the system of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a boats and ships insulation monitoring and fault location system, it includes:

the branch positioning modules 4 are connected with the load 5, are in communication connection with the insulation monitoring device, and are used for detecting low-frequency alternating-current signals injected by the insulation monitoring device, detecting faulted branches and sending the faulted branches to the insulation detecting device;

the terminal 1 is in communication connection with the insulation monitoring device and performs sound-light alarm according to the obtained insulation value,

Each branch road is connected with three-phase transformer 6 respectively, and sets up the circuit breaker between the total way of three-phase transformer and each branch road, and insulation monitoring device is connected with this total way, and each branch road is connected with the load respectively, and the front end of load sets up branch road orientation module, and the front end of branch road orientation module sets up the circuit breaker.

And injecting a low-frequency alternating current signal between the power grid and the earth pole, and measuring the low-frequency leakage current in the insulation monitoring device through the insulation transformer so as to calculate the insulation value. When the insulation value is lower than the set value, the system gives an audible and visual alarm signal.

For grids with multiple loops, the insulation monitoring device may cooperate with a locator to identify the faulty loop. The fault locator judges which loop the fault current flows through by detecting the 2.5Hz signal injected by the insulation monitoring device. These fault locators can be connected as a fixed device with a ring transformer that measures the injected current, can monitor multiple loops or a single loop.

When the system works, when the insulation monitoring device monitors that the insulation resistance value of a bus is lower than a set value, a signal generator of the insulation monitoring device injects alternating current low-frequency current signals into a power distribution loop for 10-25 seconds, meanwhile, a branch positioning module arranged on each branch monitors the change condition of low-frequency leakage current through a high-sensitivity annular current transformer to judge which loop fault current flows through, when the leakage current exceeds the preset value of the system, corresponding position equipment generates alarm signals, and finally, a terminal reminds workers of insulation fault occurrence at corresponding positions in a low-voltage system through sound-light alarm and records fault information to an alarm database.

The insulation monitoring device 3 is in communication connection with the acquisition server 2, and the acquisition server is in communication connection with the branch positioning module. The communication adopts 485 bus and standard Modbus protocol to exchange data among devices, and is convenient for communication integration with other systems.

The branch circuit positioning modules are all provided with circuit breakers.

The terminal comprises a computer 11, and man-machine interaction software of the current system is installed in the computer. The computer is also provided with a touch screen 12, so that the operation is convenient.

The examples should not be construed as limiting the present invention, but any modifications made based on the spirit of the present invention should be within the scope of the present invention.

Claims

1. The utility model provides a boats and ships insulation monitoring and fault location system which characterized in that: it includes:

the insulation monitoring device is used for injecting a low-frequency alternating current signal between a power grid and a ground pole and acquiring an insulation value according to a monitored leakage current value;

the system comprises a plurality of branch positioning modules, an insulation monitoring device and a leakage current detection device, wherein the branch positioning modules are connected with a load, are in communication connection with the insulation monitoring device and are used for detecting low-frequency alternating current signals injected by the insulation monitoring device and sending detected leakage current values to the insulation detection device;

2. The marine vessel insulation monitoring and fault locating system of claim 1, wherein: the insulation monitoring device is in communication connection with the acquisition server, and the acquisition server is in communication connection with the branch positioning module.

3. The marine vessel insulation monitoring and fault locating system of claim 1, wherein: the branch circuit positioning modules are all provided with circuit breakers.

4. The marine vessel insulation monitoring and fault locating system of claim 1, wherein: the terminal comprises a computer.

5. The marine vessel insulation monitoring and fault locating system of claim 4, wherein: the computer is also provided with a touch screen.

6. The marine vessel insulation monitoring and fault locating system of claim 4, wherein: the computer is provided with an alarm database for recording alarm information.

7. The marine vessel insulation monitoring and fault locating system of claim 1, wherein: the low frequency ac signal is 2.5 Hz.