CN118169605A - Railway signal equipment grounding state detection method and annular ground network detection method - Google Patents

Abstract

The invention relates to the technical field of grounding systems, and provides a method for detecting the grounding state of railway signal equipment and a method for detecting a ring-shaped ground net, aiming at the problem that the detection method is too single. Measuring loop resistance of a circuit connected with the equipotential grounding terminal block and/or transition resistance between the equipotential grounding terminal block and other equipment; and determining the grounding state of the equipotential grounding terminal block according to the comparison result between the measured resistance value and the set resistance threshold value. The invention can detect the loop resistance between two grounding wires of the same equipotential grounding terminal row connected with the annular grounding grid and the loop resistance between the equipotential grounding terminal row and the annular grounding grid, and is respectively used for judging whether the equipotential grounding terminal row is in single-point redundant grounding or not and whether the equipotential grounding terminal row forms a closed loop or not, thereby ensuring the safety and the reliability of a railway signal equipment grounding system.

Description

Railway signal equipment grounding state detection method and annular ground network detection method

Technical Field

The invention relates to the technical field of grounding systems, in particular to a method for detecting the grounding state of railway signal equipment and a method for detecting a ring-shaped ground network.

Background

The grounding of railway signal equipment is an important component of a railway signal system, and the reliability of the grounding is related to the normal operation of each professional equipment of railway signals, so that the grounding system is firstly ensured to be installed in place before the equipment operates. In addition, in order to ensure the safe operation of each railway signal device, the grounding system of the railway signal device also needs to be detected after completion and subsequent maintenance.

Currently, in a grounding system of railway signal equipment, railway signal equipment (signal equipment for short hereinafter) is arranged in each room of a signal building, an equipotential grounding terminal block (the equipotential grounding terminal block refers to an equipotential connecting terminal box which is grounded) is arranged in each room, and the grounding terminal of each signal equipment is connected to the equipotential grounding terminal block, so that the purpose of grounding is achieved. In the checking and maintaining process of the grounding of the signal equipment, maintenance personnel usually test the grounding resistance of each equipotential grounding terminal strip, and when the grounding resistance meets the standard requirement, the equipment is judged to be qualified in grounding.

However, according to the characteristics of the grounding system of the railway signal equipment and the grounding technical requirements, the grounding equipment with different functions should be provided with respectively independent equipotential grounding terminal blocks, including cable lead-in equipotential grounding terminal blocks, transmission channel lightning protection equipotential grounding terminal blocks, power supply lead-in equipotential grounding terminal blocks, safety protection equipotential grounding terminal blocks and the like; in addition, the equipotential grounding terminal block is connected with the building grounding body in a single-point redundancy way, and a closed loop is not required to be formed. Current grounding systems do not meet this requirement. Meanwhile, the existing detection means is too single, whether signal equipment is grounded independently according to the function type and whether a loop is formed between equipotential grounding terminal rows is not detected effectively, and the grounding safety of railway signal equipment cannot be fully guaranteed.

In addition, in the related art, whether the annular ground net is corroded and broken is checked, and only the ground around the signal building can be excavated, so that the annular ground net is exposed to check whether the annular ground net is corroded and broken, which is very troublesome and uneconomical.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the related art to some extent.

An object of the present invention is to provide a method for detecting a ground state of railway signal equipment, which detects whether the ground of the railway signal equipment is effective and reliable.

Another object of the present invention is to provide a method for detecting a ring-shaped counterpoise, which detects whether the ring-shaped counterpoise is broken.

In order to achieve the above object, the present invention first provides a grounding system for railway signal equipment.

The grounding system for the railway signal detection equipment comprises an annular grounding grid which is arranged around a signal building and is enclosed into a closed loop shape, and a plurality of types of equipotential grounding terminal rows which are arranged among the equipment of the signal building;

Each signal device arranged in the device room is provided with a plurality of types of grounding terminals, and the grounding terminals are connected to equipotential grounding terminal blocks of corresponding types through equipotential connecting wires;

The equipotential ground terminal block is redundantly connected to the ring ground network through at least two ground lines.

Further, the equipotential ground terminal strip is divided according to functions, and at least comprises the following types:

the cable is led into an equipotential grounding terminal block which is arranged between the cables and is used for grounding connection of a metal shielding layer of the signal cable;

The transmission channel lightning protection equipotential grounding terminal block is arranged in the lightning protection junction room and used for grounding connection of the signal cable lightning protection device;

The power supply is introduced into the equipotential grounding terminal strip and is arranged in the power supply chamber and used for grounding connection of the signal power supply lightning protection equipment;

the safety protection equipotential grounding terminal strip is arranged in the power supply chamber, the signal computer chamber, the signal mechanical chamber and the lightning protection branching chamber and is used for grounding connection of the metal shell of the signal equipment.

Further, the device also comprises reserved equipotential grounding terminal blocks which are arranged among the devices and used for grounding when the devices are added later.

Further, the annular ground net is connected to the through ground wire in a redundant manner through two second ground wires.

On the basis, the invention provides a method for detecting the grounding state of railway signal equipment, which is used for detecting the grounding state of the grounding system. The method specifically comprises the following steps:

measuring loop resistance of a circuit to which the equipotential grounding terminal block is connected and/or transition resistance between the equipotential grounding terminal block and other equipment;

And determining the grounding state of the equipotential grounding terminal block according to the comparison result between the measured resistance value and the set resistance threshold value.

Further, the measuring the loop resistance of the circuit connected to the equipotential grounding terminal strip includes measuring the loop resistance between two grounding wires connected to the annular ground network by the same equipotential grounding terminal strip as a first loop resistance;

the method comprises the steps of determining the grounding state of the equipotential grounding terminal block according to a comparison result between a measured resistance value and a set resistance threshold value, comparing the first loop resistance with the set first loop resistance threshold value, and judging that the equipotential grounding terminal block is not connected with the annular ground network redundantly when the first loop resistance is larger than the first loop resistance threshold value.

Further, the loop resistance between two grounding wires of the same equipotential grounding terminal strip connected with the annular ground network is measured and used as a first loop resistance, and the specific method is as follows:

And clamping one of the grounding wires by using a loop resistance tester, and measuring the first loop resistance.

Further, the measuring the loop resistance of the circuit connected to the equipotential grounding terminal block includes measuring the loop resistance between the equipotential grounding terminal block and the annular ground network as a second loop resistance;

The step of determining the grounding state of the equipotential grounding terminal strip according to the comparison result between the measured resistance value and the set resistance threshold value comprises the step of comparing the second loop resistance with the set second loop resistance threshold value, and determining that the equipotential grounding terminal strip forms a closed loop when the second loop resistance is smaller than the second loop resistance threshold value.

Further, the loop resistance between the equipotential grounding terminal strip and the annular ground network is measured and used as a second loop resistance, and the specific method is as follows:

and clamping the two grounding wires by using a loop resistance tester to measure the second loop resistance.

Further, the measuring the transition resistance between the potential grounding terminal block and other equipment comprises measuring the transition resistance between any two equipotential grounding terminal blocks as a first transition resistance;

the method comprises the steps of determining the grounding state of the equipotential grounding terminal rows according to a comparison result between a measured resistance value and a set resistance threshold, wherein the step of comparing the first transition resistance with the set first transition resistance threshold, and judging that at least one of the two equipotential grounding terminal rows to be tested is not connected with the annular ground network when the first transition resistance is larger than the set first transition resistance threshold.

Further, when the first transition resistance between any two equipotential grounding terminal rows is larger than a set first transition resistance threshold value, measuring the first transition resistance between one equipotential grounding terminal row and any other equipotential grounding terminal row, and when the first transition resistance is still larger than the set first transition resistance threshold value, judging that the equipotential grounding terminal row is not connected with the annular ground network; and the measurement and judgment are carried out on the other equipotential grounding terminal strip by adopting the same method.

Further, the transition resistance between the measurement potential grounding terminal strip and other equipment comprises a transition resistance between a grounding terminal on the measurement signal equipment and a corresponding equipotential grounding terminal strip, and the transition resistance is used as a second transition resistance;

and determining the grounding state of the equipotential grounding terminal block according to the comparison result between the measured resistance value and the set resistance threshold value, wherein the determining the grounding state of the equipotential grounding terminal block comprises the step of comparing the second transition resistance with the set second transition resistance threshold value, and judging that the tested signal equipment is not connected with the equipotential grounding terminal block when the second transition resistance is larger than the set second transition resistance threshold value.

The invention also provides a method for detecting the annular ground net in the railway signal equipment grounding system. The method comprises the following specific steps:

Measuring a transition resistance between any two equipotential grounding terminal rows to serve as a first transition resistance;

When the railway signal equipment grounding system is completed, confirming that the first transition resistance between two qualified adjacent equipotential grounding terminal rows is used as an initial value, and measuring the first transition resistance between the two adjacent equipotential grounding terminal rows as a maintenance value through subsequent maintenance;

and comparing the initial value with the maintenance value, and judging that the annular ground network has corrosion fracture when the difference value between the initial value and the maintenance value exceeds a defined difference value threshold value.

Further, all equipotential grounding terminal blocks are grouped according to positions connected with the annular ground network layout;

And determining initial values and maintenance values of the first transition resistances in and among the groups, and comparing the initial values and the maintenance values in and among the groups to judge the corrosion fracture position of the annular ground network.

In still another aspect, the present invention provides a detection apparatus for use in the above-mentioned grounding system of railway signal equipment, including: a grounding detector and a plurality of sensors;

the sensors are respectively arranged on the grounding wires between the equipotential grounding terminal blocks and the annular grounding grid;

The grounding detector comprises an operation unit and a first switch unit, and the sensor is connected to the first switch unit through a sensor connecting wire;

the first switch unit controls the sensor to work, the sensor measures loop resistance between two grounding wires and loop resistance between the equipotential grounding terminal strip and the annular grounding net and sends the loop resistance to the grounding detector, and the operation unit of the grounding detector judges whether the received loop resistance is abnormal according to a set threshold value.

Further, the loop resistance between the two grounding wires measured by the sensor is a first loop resistance;

And the operation unit of the grounding detector compares the first loop resistance with a set first loop resistance threshold value, and when the first loop resistance is larger than the first loop resistance threshold value, the equipotential grounding terminal strip is judged to be not in redundant connection with the annular grounding grid, and the grounding detector gives an alarm.

Further, the loop resistance between the equipotential grounding terminal strip and the annular ground network, which is measured by the sensor, is a second loop resistance;

And the operation unit of the grounding detector compares the second loop resistance with a set second loop resistance threshold value, and when the second loop resistance is larger than the second loop resistance threshold value, the equipotential grounding terminal strip is judged to be not in redundant connection with the annular grounding grid, and the grounding detector gives an alarm.

Further, the sensor comprises a first induction head and a second induction head which are nested, wherein the first induction head is sleeved on one grounding wire and is used for measuring loop resistance between the two grounding wires; the second induction sleeve is sleeved with two grounding wires and used for detecting loop resistance between the equipotential grounding terminal block and the annular grounding grid.

Further, the first inductive head and the second inductive head work by adopting signals with different frequencies respectively.

Further, the grounding detector also comprises a second switch unit, each equipotential grounding terminal block is connected to the grounding detector through an auxiliary connecting wire, and the on-off of the equipotential grounding terminal blocks is controlled by the second switch unit;

the second switch unit controls the two equipotential grounding terminal rows to be connected, and measures the transition resistance between the two connected equipotential grounding terminal rows as a first transition resistance;

The operation unit of the grounding detector compares the first transition resistance with a set first transition resistance threshold value, and when the first transition resistance is larger than the set first transition resistance threshold value, the situation that at least one of the two equipotential grounding terminal rows to be tested is not connected with the annular grounding grid is judged, and the grounding detector gives an alarm.

Further, when the first transition resistance between the two equipotential grounding terminal rows is larger than a set first transition resistance threshold value, the second switch unit controls one equipotential grounding terminal row to be connected with any one equipotential grounding terminal row of the other equipotential grounding terminal rows, and measures the first transition resistance, and when the first transition resistance is still larger than the set first transition resistance threshold value, the operation unit of the grounding detector judges that the equipotential grounding terminal row is not connected with the annular grounding grid; and an arithmetic unit of the grounding detector adopts the same method to measure and judge the other equipotential grounding terminal block.

Further, the grounding detector is also provided with a storage unit, and when a railway signal equipment grounding system is completed, the first transition resistance between two adjacent equipotential grounding terminal rows which are confirmed to be qualified is used as an initial value and is stored in the storage unit;

The grounding detector measures a first transition resistance between the same two adjacent equipotential grounding terminal blocks as a maintenance value;

The operation unit of the grounding detector compares the initial value with the maintenance value, when the difference value between the initial value and the maintenance value exceeds a limited difference value threshold value, the ring-shaped ground network is judged to have corrosion fracture, and the grounding detector gives an alarm.

Further, the equipotential grounding terminal blocks are grouped according to the positions connected with the annular grounding network layout;

Initial values of the first transition resistances in the group and the assembly are stored in the storage unit, and the grounding detector respectively measures maintenance values of the first transition resistances between the two equipotential grounding terminal rows in the group and between the groups;

And comparing initial values and maintenance values in and among groups by an operation unit of the grounding detector, and judging the corrosion fracture position of the annular ground network.

The railway signal equipment grounding system at least comprises an annular ground net which is arranged around a signal building and is enclosed into a closed loop shape and a plurality of types of equipotential grounding terminal rows which are arranged in equipment of the signal building, and each signal equipment arranged in the equipment is connected with different equipotential grounding terminal rows according to different functions, so that the railway signal equipment is ensured to be independently grounded according to the function types; and each equipotential grounding terminal block is connected to the annular ground net in a redundant manner by at least two grounding wires, so that the grounding reliability of the railway signal system is ensured.

The method for detecting the grounding state of the railway signal equipment, provided by the invention, can detect the grounding combination of all the signal equipment, can detect the loop resistance between two grounding wires of the annular grounding network connected with the same equipotential grounding terminal row, and the loop resistance between the equipotential grounding terminal row and the annular grounding network, and is respectively used for judging whether the equipotential grounding terminal row is subjected to single-point redundant grounding or not and whether the equipotential grounding terminal row forms a closed loop or not, so that the safety and the reliability of a railway signal equipment grounding system are ensured.

According to the annular ground net detection method, the earthwork at the position of the annular ground net is not required to be excavated, and whether the annular ground net is broken or not can be effectively judged by comparing the initial value and the measured value of the first transition resistor, so that the detection efficiency is greatly improved, and the detection cost is reduced.

Drawings

In order to more clearly illustrate the invention or the technical solutions of the prior art, the following brief description will be given of the drawings used in the embodiments or the description of the prior art, it being obvious that the drawings in the following description are some embodiments of the invention and that other drawings can be obtained from them without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a railway signal equipment grounding system arrangement of the present invention;

FIG. 2 is a schematic diagram of a railway signaling equipment system of the present invention with a ring network disconnected;

FIG. 3 is a schematic diagram of the arrangement of the detection apparatus of the railway signal equipment grounding system of the present invention;

fig. 4 is a schematic structural diagram of a sensor in the detection device provided by the invention.

In the figure, a 1-annular grounding network, a 2-grounding wire, a 3-equipotential grounding terminal strip, a 31-cable lead-in equipotential grounding terminal strip, a 32-transmission channel lightning protection equipotential grounding terminal strip, a 33-power supply lead-in equipotential grounding terminal strip, a 34-safety protection equipotential grounding terminal strip, a 35-reserved equipotential grounding terminal strip, a 4-equipotential connecting wire, a 5-signal cable, a 6-signal device, a 7-sensor, an 8-grounding detector, an 81-operation unit, an 82-second switch unit, an 83-first switch unit, a 91-sensor connecting wire and a 92-auxiliary connecting wire.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions thereof will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments, which should not be construed as limiting the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. In the description of the present invention, it is to be understood that the terminology used is for the purpose of description only and is not to be interpreted as indicating or implying relative importance.

The railway signal equipment grounding system, the grounding state detection method, the annular ground network detection method and the detection device corresponding to the railway signal equipment grounding system are described below with reference to fig. 1-4.

Is provided.

Railway signal equipment grounding system

Fig. 1 is a schematic layout view of a railway signal equipment grounding system provided by the invention.

Referring to fig. 1, the grounding system of railway signal equipment provided by the invention comprises a ring-shaped ground net 1, a grounding wire 2, an equipotential grounding terminal block 3 and an equipotential connecting wire 4.

The annular ground net 1 is laid around the signal building to form a closed loop, and each equipotential ground terminal row 3 is connected to the annular ground net 1 in a redundant mode through two ground wires 2.

It should be noted that, in some embodiments of the present invention, the equipotential ground terminal strip 3 may be connected to the ring ground network 1 through more ground lines 2 in a redundant manner.

The medium potential grounding terminal block 3 includes, according to functions:

the cable is led into the equipotential grounding terminal strip 31, and the cable is led into the equipotential grounding terminal strip 31 to be arranged between the cables for grounding connection of the metal shielding layer of the signal cable 5;

the transmission channel lightning protection equipotential grounding terminal block 32 is arranged in the lightning protection junction room and used for grounding connection of the signal cable 5 lightning protection device;

The power supply is led into the equipotential grounding terminal strip 33, and the equipotential grounding terminal strip 33 is arranged in the power supply chamber and used for grounding connection of the signal power supply lightning protection equipment;

The safety protection equipotential grounding terminal strip 34 is arranged in equipment rooms such as a power supply room, a signal computer room, a signal mechanical room, a lightning protection branching room and the like, and is used for grounding connection of a metal shell of signal equipment;

the reserved equipotential grounding terminal blocks 35 can be arranged in each equipment room and used for grounding when equipment is added subsequently.

Each signal device 6 is arranged in each room, and various types of grounding terminals are usually arranged on the signal devices and are connected to equipotential grounding terminal blocks with corresponding functions through equipotential connecting wires 4. The ring ground net is connected to the through ground wires through two ground wires 2 in a redundant manner.

The grounding system of the railway signal equipment is an important component of the railway signal system, the grounding state of the signal equipment influences the normal operation of each professional equipment of the railway signal, the grounding state of the signal equipment generally comprises whether the grounding of different functions is respectively and independently grounded, whether each professional equipotential grounding terminal strip is in single-point redundancy connection with a building grounding body or not, and whether each professional grounding forms a closed loop or not. It is therefore desirable to provide a specific detection method and detection device for detecting the grounding system of the railway signal equipment.

Method for detecting grounding state of railway signal equipment

For the above reasons, the present embodiment provides a method for detecting a grounding state of a railway signal device, which is applied to detecting a grounding state of a grounding system of the railway signal device, including a plurality of detection strategies, but it should be noted that the following strategies can be applied singly or in combination, so as to form a plurality of embodiments. Which detection strategy or combination thereof is specifically applied depends on the situation.

A. measuring loop resistance between two grounding wires 2 of the equipotential grounding terminal strip 3 connected with the annular ground network 1 as first loop resistance, and judging whether the equipotential grounding terminal strip 3 is connected with the annular ground network 1 in a redundant mode according to the first loop resistance;

And measuring a first loop resistance between two grounding wires 2 of the equipotential grounding terminal block 3 connected with the annular grounding network 1 by using an annular resistance tester, and clamping one grounding wire by using the annular resistance tester for testing. When the first loop resistance is smaller than 0.05 ohm, the equipotential grounding terminal block 3 and the annular ground network 1 can be judged to be in redundant connection, and the connection is reliable; when the first loop resistance is between 0.05 ohm and 0.2 ohm, the redundant connection is still acceptable; when the first loop resistance value is greater than 0.2 ohm, the equipotential grounding terminal block 3 and the annular ground network 1 are judged not to be in redundant connection.

B. the transition resistance is measured between any two equipotential grounding terminal blocks 3 to be a first transition resistance, and whether the equipotential grounding terminal blocks 3 are reliably connected with the annular ground net 1 is judged according to the first transition resistance value;

The first transition resistance between any two equipotential ground terminal blocks 3 is measured with an equipotential tester. When the first transition resistance is smaller than 0.1 ohm, the connection between the equipotential grounding terminal block 3 and the annular ground network 1 can be judged to be reliable; when the first transition resistance is between 0.1 ohm and 0.2 ohm, the connection is still acceptable; when the transition resistance is larger than 0.2 ohm, the situation that the two equipotential grounding terminal blocks 3 to be tested are not connected with the annular ground net 1 is judged, at the moment, the first transition resistance between one equipotential grounding terminal block 3 and any other equipotential grounding terminal block 3 can be measured, when the first transition resistance is smaller than 0.1 ohm, the connection between the equipotential grounding terminal block 3 and the annular ground net 1 can be judged to be reliable, when the transition resistance value is between 0.1 ohm and 0.2 ohm, the connection is still possible, and when the first transition resistance value is larger than 0.2 ohm, the equipotential grounding terminal block 3 is judged to be not connected with the annular ground net 1. The measurement determination is performed by the same method for the other equipotential ground terminal block 3.

C. Measuring loop resistance between the equipotential grounding terminal blocks 3 and the annular ground network 1 on two grounding wires 2 which are in redundant connection to be a second loop resistance, and judging whether the equipotential grounding terminal blocks 3 are independently grounded or not and whether a closed loop is formed or not according to the second loop resistance;

And measuring a second loop resistance between the equipotential grounding terminal strip 3 and the annular grounding net 1 on the two grounding wires 2 which are in redundant connection, and clamping the two grounding wires by a loop resistance tester for testing. When the second loop resistance is smaller than 0.1 ohm, the measured equipotential grounding terminal block 3 can be judged to form a closed loop; when the second loop resistance is between 0.1 ohm and 0.2 ohm, checking whether the insulation of the signal cable of the related signal equipment is bad or not; when the second loop resistance is greater than 0.2 ohm, it is determined that the equipotential ground terminal block 3 does not form a closed loop.

D. Measuring a second transition resistance of a transition resistance bit between a grounding terminal on the signal equipment 6 and a corresponding equipotential grounding terminal strip 3, and judging the connection condition of the signal equipment and the equipotential grounding terminal strip according to the second transition resistance value;

The second transition resistance between the ground terminal on the signal device 6 and the corresponding equipotential ground terminal bank 3 is measured with an equipotential tester. When the second transition resistance is smaller than 0.05 ohm, the connection between the tested signal equipment 6 and the equipotential grounding terminal block 3 can be judged to be reliable; when the second transition resistance value is between 0.05 ohm and 0.2 ohm, the tested signal equipment 6 can be connected with the equipotential grounding terminal block 3; when the transition resistance value is larger than 0.2 ohm, the tested signal equipment 6 is judged to be not connected with the equipotential grounding terminal block 3.

According to the railway signal equipment grounding system detection method, the grounding resistance of the equipotential grounding terminal strip is not required to be measured by arranging the grounding electrode outdoors, and whether the grounding condition of the signal equipment meets the standard requirement is judged according to the first loop resistance, the second loop resistance, the first transition resistance and the second transition resistance. The method is simple and easy to operate, and has high accuracy in measurement and judgment, so that a very effective method is provided for grounding completion acceptance and maintenance detection of signal equipment, and efficiency of completion acceptance and daily maintenance is improved.

Annular ground screen detection method

The embodiment provides a detection method of a ring-shaped ground net, wherein the ring-shaped ground net is used as one of important components of a railway signal equipment grounding system, and corrosion fracture can occur along with time, so that the ring-shaped ground net can have a great influence on the railway signal equipment grounding system. The conventional ground resistance detection method cannot judge the fracture condition, and only the ground can be excavated to expose the ground net to detect whether the corrosion fracture condition exists or not, so that the method has great influence on the surrounding environment, and has the advantages of low efficiency, high cost and inconvenient operation.

Therefore, the embodiment utilizes the measurement parameters which are the same as the partial detection means of the method for detecting the grounding state of the railway signal equipment to detect and judge the fracture condition of the annular ground network.

The detection method is formed by deformation and expansion according to the detection strategy B of the above embodiment.

The method comprises the following steps:

Firstly, measuring a transition resistance between any two equipotential grounding terminal rows 3 as a first transition resistance, and judging whether the equipotential grounding terminal rows 3 are reliably connected with the annular ground net 1 according to a first transition resistance value;

then, taking the first transition resistance between two adjacent equipotential grounding terminal rows 3 confirmed to be qualified in completion of acceptance as an initial value, and taking the first transition resistance between the two adjacent equipotential grounding terminal rows 3 measured in follow-up maintenance as a maintenance value; and comparing the initial value with the maintenance value to determine whether the annular ground net 1 is corroded and broken.

For implementation, reference is made to fig. 2. The safety protection equipotential ground terminal strip 34 of the power supply room is adjacent to the power supply introduction equipotential ground terminal strip 33 in the present room, and also adjacent to the reserved equipotential ground terminal strip 35 of the signal computer room, and is determined as the initial value of the first transition resistance when the annular ground network 1 is qualified at the time of completion and acceptance, and at this time, the first transition resistance between the two should be less than 0.05 ohm. The ring-shaped ground network is operated for a period of time and then needs to be maintained, and during maintenance, the safety protection equipotential grounding terminal strip 34 of the power supply chamber, the power supply introduction equipotential grounding terminal strip 33 in the power supply chamber and the reserved equipotential grounding terminal strip 35 of the signal computer chamber are tested, wherein the first transition resistance between the two is a maintenance value; when the ring-shaped ground screen is broken and split at the ring-shaped ground screen 1, the maintenance value of the first transition resistance is changed greatly from the initial value. If the ring-shaped ground net is only corroded and broken at the point A, the maintenance value and the initial value of the safety protection equipotential ground terminal strip 34 of the power supply chamber and the maintenance value of the power supply introduction equipotential ground terminal strip 33 in the power supply chamber should not change greatly, but the maintenance value of the first transition resistance of the reserved equipotential ground terminal strip 35 of the signal computer chamber exceeds 0.1 ohm, even exceeds 0.2 ohm, and is far greater than the initial value, so that the ring-shaped ground net between the safety protection equipotential ground terminal strip 34 and the power supply introduction equipotential ground terminal strip can be judged to have a breaking condition.

Whether the annular ground net 1 is corroded and broken or not can be judged according to the following rule, and when the change of the initial value and the maintenance value of the first transition resistance is more than 50%, and the maintenance value of the first transition resistance is more than 0.1 ohm, the annular ground net can be judged to be corroded and broken; when the maintenance value of the first transition resistance is larger than 0.2 ohm, the annular ground network can be judged to have corrosion fracture.

The method for detecting the corrosion fracture condition of the annular ground screen is adopted to detect whether the annular ground screen 1 is corroded and broken or not, only the ground around the signal building can be excavated, the annular ground screen is exposed to check whether the corrosion fracture condition is present or not, the method is very troublesome and uneconomical, the ground is not required to be excavated by moving soil, the detection efficiency is improved, and the cost is reduced.

In order to increase the accuracy of the judgment and judge the specific fracture position of the annular ground network, the above embodiment of the present invention may be further improved, and the specific steps are as follows:

The equipotential grounding terminal strips 3 are grouped according to the positions which are distributed and connected with the annular ground network 1, the initial values and maintenance values of the first transition resistances in the groups and among the groups are determined, and the comparison between the groups is carried out to judge whether the annular ground network 1 has corrosion fracture conditions or not.

The adjacent equipotential ground terminal strips 3 are typically connected to the ring counterpoise 1 in a group. Such as: the equipotential grounding terminal rows in the same room are adjacent to the grounding position on the annular ground net and can be divided into one group. As shown in fig. 2, the power supply introduction equipotential ground terminal block 33 and the safety protection equipotential ground terminal block 34 of the power supply room are grouped, and the safety protection equipotential ground terminal block 34 and the reserve equipotential ground terminal block 35 of the signal computer room are grouped. In this way, the equipotential ground terminal blocks may be divided into a plurality of groups, and of course, three or more equipotential ground terminal blocks may be included in one group, and the number of equipotential ground terminal blocks may be unequal to those of the other groups.

When the completion test is finished, measuring and determining the initial value of a first transition resistance between two equipotential grounding terminal rows in the same group, such as the initial value of the first transition resistance between the equipotential grounding terminal row 33 and the safety protection equipotential grounding terminal row 34 when the power supply of the power supply room is introduced; the first transition resistance between the safety protection equipotential ground terminal block 34 and the reserved equipotential ground terminal block 35 of the signal computer room is initially value. Measuring and determining a first transition resistance initial value between one equipotential ground terminal block in one group and any equipotential ground terminal block in the other group when completion acceptance is performed; if the measurement determines that the power supply of the power supply room is introduced into the first transition resistance initial value between the equipotential grounding terminal block 33 and the reserved equipotential grounding terminal block 35 of the signal computer room, and the first transition resistance initial value between the signal computer room and the safety protection equipotential grounding terminal block 34; the first transition resistance initial value between the safety protection equipotential ground terminal block 34 of the power supply room and the reserved equipotential ground terminal block 35 of the signal computer room and the first transition resistance initial value between the safety protection equipotential ground terminal block 34 of the signal computer room are measured and determined.

During subsequent maintenance detection, measuring and determining a first transition resistance maintenance value between two equipotential grounding terminal rows in the same group, such as a first transition resistance maintenance value between a power-supply-introduced equipotential grounding terminal row 33 and a safety protection equipotential grounding terminal row 34 of a power supply room; the first transition resistance maintenance value between the safety protection equipotential ground terminal block 34 and the reserved equipotential ground terminal block 35 of the signal computer room. Measuring and determining a first transition resistance maintenance value between one equipotential ground terminal block in one group and any equipotential ground terminal block in the other group during maintenance; a first transition resistance maintenance value between the power supply lead-in equipotential ground terminal block 33 of the power supply room and the reserved equipotential ground terminal block 35 of the signal computer room, and a first transition resistance maintenance value between the power supply lead-in equipotential ground terminal block 34 of the signal computer room; the first transition resistance maintenance value between the safety protection equipotential ground terminal block 34 of the power supply room and the reserved equipotential ground terminal block 35 of the signal computer room, and the first transition resistance maintenance value between the safety protection equipotential ground terminal block 34 of the signal computer room are measured and determined.

The initial value is compared with the maintenance value to determine whether the ring-shaped net 1 is broken, and the location of the break. The comparison may be performed in the same group, for example, the initial value and the maintenance value of the first transition resistance between the power-supply-induced equipotential ground terminal row 33 and the safety protection equipotential ground terminal row 34 of the power supply chamber are compared; the initial value and maintenance value of the first transition resistance between the safety protection equipotential ground terminal block 34 and the reserved equipotential ground terminal block 35 of the signal computer room are compared. Then, the two groups are compared, and the initial value and the maintenance value between any equipotential grounding terminal rows between the two groups are compared. And judging whether the annular ground net is corroded and broken according to the change conditions of the initial value and the maintenance value.

Grounding detection device

In order to detect the ground state of the above-described railway signal equipment ground system, the present embodiment provides a ground detection device, as shown in fig. 3, including a ground detector 8 and a sensor 7.

The ground fault detector 8 includes an arithmetic unit 81, a first switching unit 83, and a second switching unit 82.

The sensor is arranged on the grounding wire 2 between the equipotential grounding terminal block 3 and the annular grounding net 1 and is used for measuring a first loop resistance and a second loop resistance. The sensor 7 is connected to the first switch unit 83 of the ground detector via a sensor connection line 91, the equipotential ground terminal strip is connected to the ground detector 8 via an auxiliary connection line 92, and the two equipotential ground terminal strips 3 are connected via the second switch unit 82.

The sensor 7, as shown in fig. 4, includes a first inductive head 71 and a second inductive head 72 which are nested, and integrally detects a first loop resistance and a second loop resistance respectively. Two grounding wires 2 are connected between the equipotential grounding terminal block 3 and the annular grounding net 1 in a redundant way, wherein the first induction head 71 is sleeved on one grounding wire only and is used for detecting a loop resistance; the second inductive head 72 is sleeved with two grounding wires for detecting a second loop resistance.

The two grounding wires 2 are connected with the annular ground net 1 through the equipotential grounding terminal blocks 3 to form a closed loop, and the first inductive head 71 judges whether the connection is reliable or not by detecting the first loop resistance of the closed loop. The second inductive head 72 is sleeved on two ground wires, which together with the equipotential connection lines 4 connecting the signal devices 6 do not form a closed loop, and therefore the second loop resistance is detected for determining whether a closed loop is formed.

The closed loop current generated by the first inductive head during working is opposite in direction and same in size on the two grounding wires, and the current counteracts each other, so that the working of the second inductive head is not influenced.

When the second inductive head works, if the equipotential grounding terminal block does not form a closed loop, no closed loop current is generated, and the work of the first inductive head is not influenced; when the equipotential grounding terminal is arranged to form a closed loop, induced current is generated on the first induction head and the second induction head, and the connection relation of the grounding wires can obtain that the induced current of the second induction head is twice that of the first induction head, at the moment, the operation unit 81 is used for analyzing and processing, the induced current of the first induction head is subtracted by 1/2 of the induced current of the second induction head, and then the first loop resistance is calculated.

In addition, the first inductive head 71 and the second inductive head 72 can operate by using signals of different frequencies, respectively, and mutual interference can be prevented.

By the detection device of the embodiment, the detection method can be realized, the first loop resistance and the second loop resistance of each equipotential grounding terminal strip and the first transition resistance among any equipotential grounding terminal strip are detected one by one, and alarm prompt is carried out according to the set threshold value.

Specifically, the sensors 7 are installed on the grounding wire 2 between the equipotential grounding terminal block 3 and the annular grounding net 1 among the power supply room, the signal computer room, the signal mechanical room, the lightning protection junction room and the cable, the sensors 7 are sleeved on the grounding wire 2, the operation unit 81 of the grounding detector 8 sequentially controls the first switch unit 83 to be connected with the sensors 7 one by one, and the first loop resistance and the second loop resistance are measured.

All the equipotential ground terminal blocks 3 between the power supply room, the signal computer room, the signal machine room, the lightning distribution room and the cable are connected to the ground detector 8 through auxiliary connection lines 92. During the test, the operation unit 81 of the ground detector 8 controls the second switch unit 82 to connect two equipotential ground terminal rows one by one, and measures the first transition resistance. After the test of the first transition resistance between all the equipotential grounding terminal blocks is completed, the operation unit 81 controls the second switch unit 82 to be in the closed state, so that a closed loop cannot be formed between the equipotential grounding terminal blocks 3.

The grounding state of the signal equipment generally comprises whether the grounding of different functions is respectively and independently grounded, whether each professional equipotential grounding terminal block is in single-point redundancy connection with a building grounding body, and whether each professional grounding forms a closed loop.

Based on the grounding state requirements, an alarm threshold module is arranged in the operation unit 81, and corresponding alarm information of the grounding state of the signal equipment is given according to the threshold. The alarm threshold value of the first loop resistance is divided into 0.05 ohm and 0.2 ohm, and when the first loop resistance is smaller than 0.05 ohm, the equipotential grounding terminal strip 3 and the annular ground network 1 are in redundant connection and reliable; when the first loop resistance is between 0.05 ohm and 0.2 ohm, the redundant connection is indicated to be acceptable; when the first loop resistance value is greater than 0.2 ohm, the equipotential grounding terminal block 3 is not in redundant connection with the annular ground network 1. The alarm threshold value of the first transition resistance is divided into 0.1 ohm and 0.2 ohm, and when the first transition resistance is smaller than 0.1 ohm, the connection between the equipotential grounding terminal strip 3 and the annular ground net 1 is reliable; when the first transition resistance is between 0.1 ohm and 0.2 ohm, the connection is still acceptable; when the transition resistance is greater than 0.2 ohm, the situation that the two equipotential grounding terminal blocks 3 to be tested are not connected with the annular ground net 1 is indicated. The threshold value of the second loop resistance is divided into 0.1 ohm and 0.2 ohm, and when the second loop resistance is smaller than 0.1 ohm, the measured equipotential grounding terminal strip 3 forms a closed loop; when the second loop resistance is between 0.1 ohm and 0.2 ohm, the insulation of the signal cable of the related signal equipment can be poor; when the second loop resistance is greater than 0.2 ohm, it means that the equipotential ground terminal bank 3 does not form a closed loop. Of course, the above threshold may be modified based on empirical data to obtain more accurate alert information.

Annular ground screen detection device

In this embodiment, for the problem of breakage of the ring-shaped ground network that may exist in the grounding system of the railway signal equipment, a ring-shaped ground network detection device capable of detecting breakage of the ring-shaped ground network is correspondingly provided.

The overall structure and arrangement of the annular ground net detection device are the same as those of the ground detection device, and the annular ground net detection device and the ground net detection device can be regarded as a whole, and corresponding data can be acquired according to the needs, so that the detection purpose is achieved.

The same parts as the grounding detection apparatus are not described in detail, and the difference is that a storage unit is also provided in the grounding detection apparatus.

The arithmetic unit 81 of the ground detector 8 controls the second switch unit 82 to connect the two equipotential ground terminal blocks one by one, and measures the first transition resistance.

And taking the first transition resistance between two adjacent equipotential grounding terminal rows 3 which are confirmed to be qualified during completion and acceptance as an initial value, and taking the first transition resistance between the two adjacent equipotential grounding terminal rows 3 which are measured by subsequent maintenance as a maintenance value. Both are stored in a memory unit. The operation unit compares and judges the difference value between the initial value and the maintenance value of the first transition resistance to give out the relevant information of whether the annular ground network has corrosion fracture.

Whether the annular ground net 1 is corroded and broken or not can be judged according to the following rule, and when the change of the initial value and the maintenance value of the first transition resistance is more than 50%, and the maintenance value of the first transition resistance is more than 0.1 ohm, the annular ground net can be judged to be corroded and broken; when the maintenance value of the first transition resistance is larger than 0.2 ohm, the annular ground network can be judged to have corrosion fracture.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The method for detecting the grounding state of the railway signal equipment is used for detecting the grounding state of a grounding system of the railway signal equipment and is characterized in that the grounding system of the railway signal equipment comprises an annular grounding net which is arranged around a signal building and is enclosed into a closed loop shape, and a plurality of types of equipotential grounding terminal rows which are arranged among the equipment of the signal building; the equipotential grounding terminal block is connected to the annular ground net through two grounding wires in a redundant mode;

The detection method comprises the following steps:

measuring loop resistance of a circuit to which the equipotential grounding terminal block is connected and/or transition resistance between the equipotential grounding terminal block and other equipment;

And determining the grounding state of the equipotential grounding terminal block according to the comparison result between the measured resistance value and the set resistance threshold value.

2. The method for detecting the ground state of railway signal equipment according to claim 1, wherein the measuring the loop resistance of the circuit to which the equipotential ground terminal block is connected includes measuring the loop resistance between two ground lines of the same equipotential ground terminal block connected to the ring ground network as the first loop resistance;

the method comprises the steps of determining the grounding state of the equipotential grounding terminal block according to a comparison result between a measured resistance value and a set resistance threshold value, comparing the first loop resistance with the set first loop resistance threshold value, and judging that the equipotential grounding terminal block is not connected with the annular ground network redundantly when the first loop resistance is larger than the first loop resistance threshold value.

3. The method for detecting the ground state of railway signal equipment according to claim 2, wherein the loop resistance between two ground wires of the same equipotential ground terminal block connected to the ring ground network is measured as the first loop resistance, specifically comprising:

And clamping one of the grounding wires by using a loop resistance tester, and measuring the first loop resistance.

4. The method for detecting the ground state of railway signal equipment according to claim 1, wherein measuring the loop resistance of the circuit to which the equipotential ground terminal block is connected includes measuring the loop resistance between the equipotential ground terminal block and the ring-shaped ground network as the second loop resistance;

The step of determining the grounding state of the equipotential grounding terminal strip according to the comparison result between the measured resistance value and the set resistance threshold value comprises the step of comparing the second loop resistance with the set second loop resistance threshold value, and determining that the equipotential grounding terminal strip forms a closed loop when the second loop resistance is smaller than the second loop resistance threshold value.

5. The method for detecting the ground state of railway signal equipment according to claim 4, wherein the loop resistance between the equipotential ground terminal strip and the ring ground network is measured as the second loop resistance, specifically comprising:

and clamping the two grounding wires by using a loop resistance tester to measure the second loop resistance.

6. The method for detecting the ground state of railway signal equipment according to claim 1, wherein the measuring the transition resistance between the potential ground terminal block and other equipment includes measuring the transition resistance between any two equipotential ground terminal blocks as a first transition resistance;

the method comprises the steps of determining the grounding state of the equipotential grounding terminal rows according to a comparison result between a measured resistance value and a set resistance threshold, wherein the step of comparing the first transition resistance with the set first transition resistance threshold, and judging that at least one of the two equipotential grounding terminal rows to be tested is not connected with the annular ground network when the first transition resistance is larger than the set first transition resistance threshold.

7. The method for detecting the ground state of railway signal equipment according to claim 6, wherein when the first transition resistance between any two equipotential ground terminal rows is greater than a set first transition resistance threshold value, the first transition resistance between one equipotential ground terminal row and any one of the other equipotential ground terminal rows is measured, and when the first transition resistance is still greater than the set first transition resistance threshold value, it is determined that the equipotential ground terminal row is not connected to the ring ground network; and the measurement and judgment are carried out on the other equipotential grounding terminal strip by adopting the same method.

8. The method for detecting the ground state of railway signal equipment according to claim 1, wherein the measuring the transition resistance between the potential ground terminal block and other equipment includes measuring the transition resistance between the ground terminal on the signal equipment and the corresponding equipotential ground terminal block as the second transition resistance;

and determining the grounding state of the equipotential grounding terminal block according to the comparison result between the measured resistance value and the set resistance threshold value, wherein the determining the grounding state of the equipotential grounding terminal block comprises the step of comparing the second transition resistance with the set second transition resistance threshold value, and judging that the tested signal equipment is not connected with the equipotential grounding terminal block when the second transition resistance is larger than the set second transition resistance threshold value.

9. The annular ground net detection method is used for detecting the condition of the annular ground net in the railway signal equipment grounding system; the railway signal equipment grounding system is characterized by comprising a ring-shaped grounding grid which is distributed around a signal building and is enclosed into a closed ring shape, and a plurality of types of equipotential grounding terminal blocks which are arranged in equipment of the signal building; the equipotential grounding terminal block is connected to the annular ground net through two grounding wires in a redundant mode;

The annular ground screen detection method comprises the following steps: measuring a transition resistance between any two equipotential grounding terminal rows to serve as a first transition resistance;

When the railway signal equipment grounding system is completed, confirming that the first transition resistance between two qualified adjacent equipotential grounding terminal rows is used as an initial value, and measuring the first transition resistance between the two adjacent equipotential grounding terminal rows as a maintenance value through subsequent maintenance;

and comparing the initial value with the maintenance value, and judging that the annular ground network has corrosion fracture when the difference value between the initial value and the maintenance value exceeds a defined difference value threshold value.

10. The ring-shaped ground screen detection method according to claim 9, wherein all the equipotential ground terminal blocks are grouped according to positions connected to the ring-shaped ground screen layout;

And determining initial values and maintenance values of the first transition resistances in and among the groups, and comparing the initial values and the maintenance values in and among the groups to judge the corrosion fracture position of the annular ground network.