CN118444204B

CN118444204B - Contact net grounding equipment, loop continuity monitoring device and method

Info

Publication number: CN118444204B
Application number: CN202410903173.8A
Authority: CN
Inventors: 黄珂; 王恕恒; 黎兴源; 杨元志; 高燕敏; 梅峰; 何云丰
Original assignee: Chengdu Zhonggong Electric Engineering Co ltd
Current assignee: Chengdu Zhonggong Electric Engineering Co ltd
Priority date: 2024-07-08
Filing date: 2024-07-08
Publication date: 2024-09-13
Anticipated expiration: 2044-07-08
Also published as: CN118444204A

Abstract

The application provides contact net grounding equipment, a loop continuity monitoring device and a loop continuity monitoring method, and relates to the technical field of contact net. In the application, the contact net grounding device comprises a contact net grounding device and a loop continuity monitoring device, wherein the contact net grounding device comprises a contact net line, a grounding disconnecting link and a return rail line, the contact net line comprises a first contact net line and a second contact net line, a first test loop is formed, and the return rail line comprises a first return rail line and a second return rail line, and a second test loop is formed. The loop continuity monitoring device comprises a first monitoring module and a second monitoring module, and is used for monitoring loop continuity of the first test loop and the second test loop. Based on the above, the problem of low reliability in monitoring the contact network grounding device in the prior art can be improved.

Description

Contact net grounding equipment, loop continuity monitoring device and method

Technical Field

The application relates to the technical field of overhead contact systems, in particular to overhead contact system grounding equipment, a loop continuity monitoring device and a method.

Background

In the related maintenance process of the overhead line system (such as a subway overhead line system and the like), a temporary ground wire is required to be installed in an operation area, and the traditional ground wire hanging mode is that before maintenance operation, a worker carries the ground wire and an electroscope to arrive at a site, the ground wire is manually tested, hung, and then the ground wire is dismounted after maintenance is completed. The traditional operation mode has the risk of hanging the grounding wire with electricity, has the hidden trouble of transmitting electricity with the grounding wire, completely depends on manpower, has heavy tasks, long time and low work efficiency, and extrudes normal overhaul operation time.

At present, the contact net grounding device is widely applied to the contact net (contact rail) of urban rail transit positive lines or vehicle sections, parking lots and the like, can reduce the operation time, improve the maintenance efficiency, ensure the personal safety of staff and achieve the purposes of safe, reliable and economical operation. The application of the contact net grounding device can prevent the situations of live ground wire hanging and power transmission of the contact net (rail) from happening, realize the safety protection with technology and equipment, make up the defect of the safety protection with a system in the prior art, greatly reduce the time occupation ratio of ground wire hanging/dismantling while ensuring the safety, release more actual maintenance time and improve the maintenance efficiency.

Based on this, in order to ensure that the contact net grounding device can be effectively grounded, it is necessary to monitor the contact net grounding device. However, the inventors have found that there is a problem in that the reliability of monitoring the contact network grounding device is relatively low.

Disclosure of Invention

In view of the above, the present application is directed to a contact net grounding device, a loop continuity monitoring device and a method thereof, so as to solve the problem that the reliability of monitoring the contact net grounding device is relatively low in the prior art.

In order to achieve the above purpose, the application adopts the following technical scheme:

The contact net grounding device comprises a contact net line, a grounding disconnecting link and a return rail line, wherein the contact net line, the grounding disconnecting link and the return rail line are connected in series between the contact net and the return rail and used for carrying out grounding management and control on the contact net and the return rail;

the overhead line system comprises a first overhead line system and a second overhead line system, and/or the reflux rail line comprises a first reflux rail line and a second reflux rail line;

When the overhead contact line comprises the first overhead contact line and the second overhead contact line, the first overhead contact line and the second overhead contact line are connected in parallel between the first end of the grounding switch and the overhead contact line, to form a first test loop comprising the first catenary line, the second catenary line, and the catenary;

When the return rail line comprises the first return rail line and the second return rail line, the first return rail line and the second return rail line are connected in parallel between the second end of the ground switch and the return rail to form a second test loop comprising the first return rail line, the second return rail line and the return rail;

The loop continuity monitoring device comprises a first monitoring module and/or a second monitoring module, wherein the first monitoring module is matched with the first test loop, and the first monitoring module is used for monitoring the loop continuity of the first test loop; the second monitoring module is matched with the second test loop, and the second monitoring module is used for monitoring loop continuity of the second test loop.

In a preferred option of the present application, in the above contact net grounding device, the loop continuity monitoring apparatus further includes a processor, and the first monitoring module includes a first excitation current transformer and a first monitoring current transformer, where the first excitation current transformer and the first monitoring current transformer are respectively disposed in the first test loop;

After controlling an external power supply to provide a first current to the first excitation current transformer, the processor determines that the first test loop is in a closed connection state if the first monitoring current transformer outputs a second current, and determines that the first test loop is not in the closed connection state if the first monitoring current transformer does not output the second current;

And, the first excitation current transformer generates a first induced current in the first test loop in a closed connection state in response to the first current, and the first monitoring current transformer outputs the second current in response to the first induced current.

In a preferred option of the present application, in the above contact net grounding device, the loop continuity monitoring apparatus further includes a processor, and the second monitoring module includes a second excitation current transformer and a second monitoring current transformer, where the second excitation current transformer and the second monitoring current transformer are respectively disposed in the second test loop;

After controlling an external power supply to provide a third current to the second excitation current transformer, the processor determines that the second test loop is in a closed connection state if the second monitoring current transformer outputs a fourth current, and determines that the second test loop is not in the closed connection state if the second monitoring current transformer does not output the fourth current;

And, the second excitation current transformer generates a second induced current in the second test loop in a closed connection state in response to the third current, the second monitoring current transformer outputting the fourth current in response to the second induced current.

In a preferred option of the present application, in the above contact net grounding device, the loop continuity monitoring apparatus further includes a third monitoring module, where the third monitoring module is cooperatively disposed with the grounding switch, and is configured to monitor loop continuity of the grounding switch.

In a preferred option of the present application, in the above contact net grounding device, the loop continuity monitoring device further includes a processor, and the third monitoring module includes:

The first end of the first high voltage withstand unit is connected with the first end of the grounding disconnecting link;

A current limiting resistor, wherein a first end of the current limiting resistor is connected with a second end of the first high voltage withstand unit;

The first end of the test signal control unit is connected with the second end of the current limiting resistor, and the second end of the test signal control unit is connected with the processor;

The first end of the signal generator is connected with the third end of the test signal control unit, and the second end of the signal generator is connected with the processor;

the first end of the current measuring unit is connected with the third end of the signal generator, and the second end of the current measuring unit is connected with the processor;

the first end of the second high voltage withstand unit is connected with the second end of the grounding disconnecting link, and the second end of the second high voltage withstand unit is connected with the third end of the current measuring unit;

The first end of the voltage measuring unit is connected with the second end of the first high voltage withstand unit, the second end of the voltage measuring unit is connected with the second end of the second high voltage withstand unit, and the third end of the voltage measuring unit is connected with the processor.

In a preferred option of the present application, in the above contact net grounding device, the third monitoring module further includes:

An induced voltage prevention unit, wherein a first end of the induced voltage prevention unit is connected with a second end of the first high withstand voltage unit, the second end of the induced voltage prevention unit is connected with the second end of the second high voltage withstand unit, and the induced voltage prevention unit is used for performing high voltage protection on the third monitoring module.

The application also provides a loop continuity monitoring device which is used for monitoring the contact net grounding device, wherein the contact net grounding device comprises a contact net line, a grounding disconnecting link and a return rail line, the contact net line comprises a first contact net line and a second contact net line, and/or the return rail line comprises a first return rail line and a second return rail line;

when the overhead contact line comprises the first overhead contact line and the second overhead contact line, the first overhead contact line and the second overhead contact line are connected in parallel between the first end of the grounding disconnecting link and the overhead contact line, to form a first test loop comprising the first catenary line, the second catenary line, and the catenary;

when the return track line comprises the first return track line and the second return track line, the first return track line and the second return track line are connected in parallel between the second end of the grounding switch and the return track to form a second test loop comprising the first return track line, the second return track line and the return track;

The loop continuity monitoring device comprises a first monitoring module and/or a second monitoring module, wherein the first monitoring module is matched with the first test loop, and the first monitoring module is used for monitoring loop continuity of the first test loop; the second monitoring module is matched with the second test loop, and the second monitoring module is used for monitoring loop continuity of the second test loop.

The application also provides a loop continuity monitoring method which is applied to the loop continuity monitoring device to monitor the contact network grounding device;

The overhead contact line grounding device comprises overhead contact line lines, a grounding disconnecting link and a return rail line, wherein the overhead contact line lines comprise a first overhead contact line and a second overhead contact line, and/or the return rail line comprises a first return rail line and a second return rail line;

When the overhead contact line comprises the first overhead contact line and the second overhead contact line, the first overhead contact line and the second overhead contact line are connected in parallel between the first end of the grounding disconnecting link and the overhead contact line to form a first test loop comprising the first overhead contact line, the second overhead contact line and the overhead contact line, and when the return line comprises the first return line and the second return line, the first return line and the second return line are connected in parallel between the second end of the grounding disconnecting link and a return line to form a second test loop comprising the first return line, the second return line and the return line;

The loop continuity monitoring device comprises a first monitoring module and/or a second monitoring module, wherein the first monitoring module is matched with the first test loop, and the second monitoring module is matched with the second test loop;

the loop continuity monitoring method comprises the following steps:

the first monitoring module is used for monitoring the loop continuity of the first test loop to obtain a corresponding first test loop continuity monitoring result; and/or

And monitoring the loop continuity of the second test loop by using the second monitoring module to obtain a corresponding second test loop continuity monitoring result.

In a preferred option of the present application, in the above loop continuity monitoring method, the loop continuity monitoring device further includes a processor, and the first monitoring module includes a first excitation current transformer and a first monitoring current transformer, the first excitation current transformer and the first monitoring current transformer are respectively disposed in the first test loop, the first excitation current transformer generates a first induced current in the first test loop in a closed connection state in response to an input first current, and the first monitoring current transformer outputs a second current in response to the first induced current; the second monitoring module comprises a second excitation current transformer and a second monitoring current transformer, the second excitation current transformer and the second monitoring current transformer are respectively arranged in the second test loop, the second excitation current transformer responds to an input third current to generate a second induced current in the second test loop in a closed connection state, and the second monitoring current transformer responds to the second induced current to output a fourth current;

The step of monitoring the loop continuity of the first test loop by using the first monitoring module to obtain a corresponding monitoring result of the loop continuity of the first test loop includes:

The processor controls an external power supply to provide a first current to the first excitation current transformer and monitors whether the first monitoring current transformer outputs a second current or not;

When the processor monitors that the first monitoring current transformer outputs the second current, a first testing loop continuity monitoring result used for representing that the first testing loop is in a closed connection state is output, and when the processor monitors that the first monitoring current transformer does not output the second current, a first testing loop continuity monitoring result used for representing that the first testing loop is not in the closed connection state is output;

The step of monitoring the loop continuity of the second test loop by using the second monitoring module to obtain a corresponding second test loop continuity monitoring result includes:

The processor controls an external power supply to provide a third current for the second excitation current transformer and monitors whether the second monitoring current transformer outputs a fourth current or not;

And when the processor monitors that the second monitoring current transformer outputs the fourth current, outputting a second testing loop continuity monitoring result used for representing that the second testing loop is in a closed connection state, and when the processor monitors that the second monitoring current transformer does not output the fourth current, outputting a second testing loop continuity monitoring result used for representing that the second testing loop is not in the closed connection state.

In a preferred option of the present application, in the above loop continuity monitoring method, the loop continuity monitoring device further includes a processor and a third monitoring module;

The third monitoring module comprises a first high voltage withstand unit, a current limiting resistor, a test signal control unit, a signal generator, a current measuring unit, a second high voltage withstand unit and a voltage measuring unit, wherein the first end of the first high voltage withstand unit is connected with the first end of the grounding knife switch, the first end of the current limiting resistor is connected with the second end of the first high voltage withstand unit, the first end of the test signal control unit is connected with the second end of the current limiting resistor, the second end of the test signal control unit is connected with the processor, the first end of the signal generator is connected with the third end of the test signal control unit, the second end of the signal generator is connected with the processor, the first end of the current measuring unit is connected with the third end of the signal generator, the second end of the current measuring unit is connected with the processor, the first end of the second high voltage withstand unit is connected with the second end of the grounding knife switch, the second end of the second high voltage withstand unit is connected with the first end of the voltage measuring unit, and the first end of the voltage withstand unit is connected with the first end of the voltage withstand unit;

The loop continuity monitoring method further comprises the following steps:

After the grounding disconnecting link is closed, the first high voltage withstand unit is closed and the second high voltage withstand unit is closed, the processor controls the voltage measuring unit to measure the voltage between the second end of the first high voltage withstand unit and the second end of the second high voltage withstand unit to obtain a first voltage;

After the first voltage is obtained, the processor controls the signal generator to output test current through the test signal control unit and the current limiting resistor, controls the voltage measuring unit to measure the voltage between the second end of the first high voltage withstand unit and the second end of the second high voltage withstand unit to obtain second voltage, and controls the current measuring unit to measure the test current;

The processor determines the loop resistance of the grounding switch based on the first voltage, the second voltage and the test current, and determines a third loop continuity monitoring result corresponding to the grounding switch based on the loop resistance.

In the contact net grounding device, the loop continuity monitoring device and the method provided by the application, the loop continuity monitoring device is used for monitoring the contact net grounding device, the contact net grounding device comprises a contact net line, a grounding disconnecting link and a return rail line, the contact net line comprises a first contact net line and a second contact net line to form a first test loop, and the return rail line comprises a first return rail line and a second return rail line to form a second test loop. The loop continuity monitoring device comprises a first monitoring module and a second monitoring module, and is used for monitoring loop continuity of the first test loop and loop continuity of the second test loop respectively. Based on the above, since the first contact net line and the second contact net line included in the contact net line can form the first test loop with the contact net, the loop continuity monitoring can be performed on the first test loop alone, and likewise, since the first return rail line and the second return rail line included in the return rail line can form the second test loop with the return rail, the loop continuity monitoring can also be performed on the second test loop alone, thus, the loop continuity monitoring with smaller granularity can be realized, the reliability of the loop continuity monitoring is improved, the abnormal positioning is facilitated (the corresponding maintenance operation can be more efficient), and the problem that the reliability of monitoring the contact net grounding device in the prior art is relatively not high can be improved. In addition, the complexity of the loop continuity monitoring device can be reduced by directly utilizing the loop formed by the contact net grounding device, so that the volume can be reduced, and the installation space of the loop continuity monitoring device can not be limited when the loop continuity monitoring device is installed at a tunnel port well or the like, so that the application scene of the loop continuity monitoring device is not limited, thereby having higher practical value, because the overhead line system grounding device comprises the first overhead line system line, the second overhead line system line, the first return rail line and the second return rail line, the grounding reliability of the overhead line system grounding device can be improved, and therefore the overhead line system (rail) can be effectively grounded in the overhaul process of the overhead line system, and the problems of personal safety accidents and the like caused by invalid grounding are avoided.

Drawings

In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Fig. 1 is a schematic diagram of an application scenario of a contact net grounding device provided by an embodiment of the present application.

Fig. 2 is a circuit diagram of an application scenario of the contact net grounding device provided by the embodiment of the application.

Icon: the device comprises a JD-grounding disconnecting link, a CPU-processor, a CT 1-first excitation current transformer, a CT 2-first monitoring current transformer, a T1-first signal transformer, an R1-first current limiting resistor, an I1-first excitation current measuring unit, an I2-first monitoring current measuring unit, a K1-first electronic switch, a CT 3-second excitation current transformer, a CT 4-second monitoring current transformer, a T2-second signal transformer, an R2-second current limiting resistor, an I3-second excitation current measuring unit, an I4-second monitoring current measuring unit, a K2-second electronic switch, an H1-first high withstand voltage unit, an R3-third current limiting resistor, an M-test signal control unit, a DY-signal generator, an I5-current measuring unit, an H2-second high withstand voltage unit, a U-voltage measuring unit and a P1-induction voltage preventing unit.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

As shown in fig. 1, the embodiment of the application provides a contact net grounding device. Wherein, contact net grounding device can include contact net earthing device and return circuit continuity monitoring device, return circuit continuity monitoring device can be used for right contact net earthing device monitors.

In detail, the contact net grounding device may include a contact net line, a grounding switch, and a return rail line. That is to say, the contact line in the corresponding application scenario can be connected to the return line via the contact line, the earthing knife-switch and the return line.

In the first aspect, the overhead line may include a first overhead line and a second overhead line, and/or the return rail line may include a first return rail line and a second return rail line.

For example, in an alternative embodiment, the catenary line includes a first catenary line and a second catenary line, and the return rail line includes a first return rail line. For another example, in a second alternative embodiment, the catenary line includes a first catenary line, and the return rail line includes a first return rail line and a second return rail line. For another example, in a third alternative embodiment, the catenary line includes a first catenary line and a second catenary line, and the return rail line includes a first return rail line and a second return rail line.

When the overhead contact line comprises the first overhead contact line and the second overhead contact line, the first overhead contact line and the second overhead contact line are connected in parallel between the first end (such as the positive electrode of the grounding disconnecting link) of the grounding disconnecting link and the overhead contact line. Based on this, the first contact line, the second contact line and the first test loop of the contact line (which may be used for performing corresponding continuity detection, such as detecting the connection reliability between the contact line and the ground switch, and detecting the connection reliability between the contact line and the contact line) may be further configured while the contact line is connected to the ground switch. When the return track line includes the first return track line and the second return track line, the first return track line and the second return track line are connected in parallel between the second end of the ground knife switch (such as a negative electrode of the ground knife switch) and the return track, based on which, while the return track is connected to the ground knife switch, a second test loop including the first return track line, the second return track line and the return track may be further configured (may be used to perform corresponding continuity detection, such as detecting connection reliability between the return track line and the ground knife switch, and detecting connection reliability between the return track line and the return track).

Based on this, by providing a double catenary line and/or a double return rail line, the continuity of the line may be made more reliable, e.g. when one catenary line or return rail line connection is discontinuous, the other catenary line or return rail line may also provide an effective loop connection.

In a second aspect, the loop continuity monitoring device may include a first monitoring module and/or a second monitoring module. That is, the loop continuity monitoring device may include at least one monitoring module, for example, the loop continuity monitoring device may include only the first monitoring module, or the loop continuity monitoring device may include only the second monitoring module, or the loop continuity monitoring device may include both the first monitoring module and the second monitoring module.

The first monitoring module is matched with the first test loop, and can be used for monitoring loop continuity of the first test loop, for example, when monitoring results reflect that the first test loop is discontinuous, results of unreliable connection between a contact network line and a grounding disconnecting link and unreliable connection between the contact network line and the contact network can be obtained. The second monitoring module is cooperatively arranged with the second test loop, and can be used for monitoring loop continuity of the second test loop, for example, when monitoring results reflect that the second test loop is discontinuous, results of unreliable connection between the return rail line and the grounding knife switch and unreliable connection between the return rail line and the return rail can be obtained.

In addition, the specific construction of the loop continuity monitoring device can be referred to the following related description.

With reference to fig. 2, the embodiment of the application further provides a loop continuity monitoring device applicable to the above contact net grounding device. The loop continuity monitoring device can be used for monitoring a contact net grounding device included in the contact net grounding equipment.

As previously described in relation thereto, the catenary grounding device may include catenary lines, grounding switch JD and return rail lines, the catenary circuit may include a first catenary circuit and a second catenary circuit, and/or the return rail circuit may include a first return rail circuit and a second return rail circuit. When the overhead contact line comprises the first overhead contact line and the second overhead contact line, the first overhead contact line and the second overhead contact line can be connected in parallel between the first end of the grounding switch JD and the overhead contact line, to form a first test loop (test loop i as shown in fig. 2) comprising the first catenary line, the second catenary line, and the catenary. When the return track line includes the first return track line and the second return track line, the first return track line and the second return track line may be connected in parallel between the second end of the ground blade JD and the return track to form a second test loop (a test loop ii shown in fig. 2) including the first return track line, the second return track line, and the return track.

As previously described in relation thereto, the loop continuity monitoring device may include a first monitoring module and/or a second monitoring module, such as at least one of the first monitoring module and the second monitoring module. The first monitoring module is matched with the first test loop and can be used for monitoring loop continuity of the first test loop. The second monitoring module is matched with the second test loop and can be used for monitoring loop continuity of the second test loop.

Based on the above, since the first contact net line and the second contact net line included in the contact net line can form the first test loop with the contact net, the loop continuity monitoring can be performed on the first test loop alone, and likewise, since the first return rail line and the second return rail line included in the return rail line can form the second test loop with the return rail, the loop continuity monitoring can also be performed on the second test loop alone, thus, the loop continuity monitoring with smaller granularity can be realized, the reliability of the loop continuity monitoring is improved, the abnormal positioning is facilitated (the corresponding maintenance operation can be more efficient), and the problem that the reliability of monitoring the contact net grounding device in the prior art is relatively not high can be improved. In addition, the overhead line system grounding device comprises a first overhead line system circuit, a second overhead line system circuit, a first return rail circuit and a second return rail circuit, the overhead line system grounding device is arranged on the first return rail circuit, the first return rail circuit is connected with the second return rail circuit, the second return rail circuit is connected with the first return rail circuit, the second return rail circuit is connected with the second return rail circuit, and the second return rail circuit is connected with the second return rail circuit.

Illustratively, in an alternative embodiment, the loop continuity monitoring device may further comprise a processor CPU. Moreover, the first monitoring module may include a first excitation current transformer CT1 and a first monitoring current transformer CT2, where the first excitation current transformer CT1 and the first monitoring current transformer CT2 may be respectively disposed in the first test loop, and a specific setting position may not be limited, for example, the first excitation current transformer CT1 may be disposed in the first catenary line, and the first monitoring current transformer CT2 may be disposed in the second catenary line, or in other embodiments, may also be interchanged.

Based on this, the processor CPU may control the external power supply to provide the first excitation current transformer CT1 with the first current, if the first monitoring current transformer CT2 outputs the second current, it is determined that the first test loop is in the closed connection state, and if the first monitoring current transformer CT2 does not output the second current, it is determined that the first test loop is not in the closed connection state (for example, connection between the catenary line and the catenary is unreliable, for example, connection between the contact points A1 and B1 is unreliable, connection between the catenary line and the grounding switch JD is unreliable, for example, connection between the catenary line and the grounding switch JD is unreliable).

Wherein, the first excitation current transformer CT1 is responsive to the first current to generate a first induced current in the first test loop in a closed connection state, and thus the first monitoring current transformer CT2 is responsive to the first induced current to output the second current. That is, it is determined that the first test loop is in a closed connection state as long as the processor CPU can monitor that the first monitoring current transformer CT2 has output of the second current. Conversely, when the first test loop is not in the closed connection state (e.g., the connection point of the line is opened), the first exciting current transformer CT1 cannot generate the first induced current in the first test loop that is not in the closed connection state in response to the first current, so the first monitoring current transformer CT2 cannot output the second current, and the processor CPU can determine that the first test loop is not in the closed state when it is detected that the first monitoring current transformer CT2 does not output the second current.

For example, after passing through the first signal transformer T1 (with a transformation ratio of T), the AC240V voltage source (with a frequency of 50 Hz) may obtain a current with a frequency of 50Hz (which may be monitored by the first exciting current measuring unit I1 and transmitted to the processor CPU) through the first current limiting resistor R1, and the current is transmitted as an input signal to the first exciting current transformer CT1 (with a transformation ratio of n 1), where an AC induction current I ₀₁ with the same frequency is induced in a primary closed loop (such as the first test loop), and when and only when the primary closed loop is in a closed connection state, the first monitoring current transformer CT2 (with a transformation ratio of n 2) can induce the current I ₀₁ and output the current (which may be monitored by the first monitoring current measuring unit I2 and transmitted to the processor CPU), and if the primary closed loop is disconnected, the current I ₀₁ cannot be induced in the primary closed loop, and the first monitoring current transformer CT2 does not output the current.

In addition, in some alternative embodiments, a first electronic switch K1 may be further connected between the first current limiting resistor R1 and the first excitation current transformer CT1, so that the processor CPU may control whether the AC240V voltage source provides current to the first excitation current transformer CT1 through the first electronic switch K1.

Illustratively, in an alternative embodiment, the loop continuity monitoring device may further comprise a processor CPU. Moreover, the second monitoring module may include a second excitation current transformer CT3 and a second monitoring current transformer CT4, where the second excitation current transformer CT3 and the second monitoring current transformer CT4 may be respectively disposed in the second test circuit, and a specific disposition location may not be limited, for example, the second excitation current transformer CT3 may be disposed in the first return rail line, and the second monitoring current transformer CT4 may be disposed in the second return rail line, or in other embodiments, may also be interchanged.

Based on this, the processor CPU may control the external power supply to supply the third current to the second excitation current transformer CT3, if the second monitoring current transformer CT4 outputs the fourth current, it is determined that the second test loop is in the closed connection state, and if the second monitoring current transformer CT4 does not output the fourth current, it is determined that the second test loop is not in the closed connection state (for example, the connection between the return rail line and the return rail is unreliable, for example, the connection between the contact points A2 and B2 is unreliable, and the connection between the return rail line and the ground knife gate JD is unreliable, for example, the connection between the contact point C2 is unreliable).

Wherein the second excitation current transformer CT3 is responsive to the third current for generating a second induced current in the second test loop in a closed connection state, and the second monitoring current transformer CT4 is responsive to the second induced current for outputting the fourth current. That is, as long as the processor CPU can monitor that the second monitoring current transformer CT4 has output of the fourth current, it can be determined that the second test loop is in a closed connection state. Conversely, when the second test loop is not in the closed connection state (e.g., the connection point of the line is opened), the second excitation current transformer CT3 cannot generate the second induced current in the second test loop that is not in the closed connection state in response to the third current, so the second monitoring current transformer CT4 cannot output the fourth current, and the processor CPU can determine that the second test loop is not in the closed state when it is detected that the second monitoring current transformer CT4 does not output the fourth current.

For example, after passing through the second signal transformer T2 (with a transformation ratio of T), the AC240V voltage source (with a frequency of 50 Hz) may obtain a current with a frequency of 50Hz (which may be monitored by the second exciting current measuring unit I3 and transmitted to the processor CPU) through the second current limiting resistor R2, and the current is transmitted as an input signal to the second exciting current transformer CT3 (with a transformation ratio of n 1), where an AC induction current I ₀₂ with the same frequency is induced in the primary closed loop (such as the second test loop), and if and only if the primary closed loop is in the closed connection state, the second monitoring current transformer CT4 (with a transformation ratio of n 2) can induce the current I ₀₂ and output the current (which may be monitored by the second monitoring current measuring unit I4 and transmitted to the processor CPU), and if the primary closed loop is disconnected, the current I ₀₂ cannot be induced in the primary closed loop, and the second monitoring current transformer CT4 cannot output the current.

In addition, in some alternative embodiments, a second electronic switch K2 may be further connected between the second current limiting resistor R2 and the second excitation current transformer CT3, so that the processor CPU may control whether the AC240V voltage source provides current to the second excitation current transformer CT3 through the second electronic switch K2.

For example, in an alternative embodiment, the loop continuity monitoring device may further comprise a third monitoring module. The third monitoring module is matched with the grounding switch JD, and can be used for monitoring the continuity of a loop of the grounding switch JD, such as monitoring the closing condition (state) of the grounding switch JD.

For example, in an alternative embodiment, the third monitoring module may include a first high withstand voltage unit H1, a third current limiting resistor R3, a test signal control unit M, a signal generator DY, a current measuring unit I5, a second high withstand voltage unit H2, and a voltage measuring unit U.

In detail, a first end of the first high voltage tolerant unit H1 is connected to a first end of the ground knife switch JD. The first end of the third current limiting resistor R3 is connected with the second end of the first high voltage withstand unit H1. The first end of the test signal control unit M is connected with the second end of the third current limiting resistor R3, and the second end of the test signal control unit M is connected with the processor CPU. The first end of the signal generator DY is connected with the third end of the test signal control unit M, and the second end of the signal generator DY is connected with the processor CPU. The first end of the current measuring unit I5 is connected with the third end of the signal generator DY, and the second end of the current measuring unit I5 is connected with the processor CPU. The first end of the second high voltage-resistant unit H2 is connected to the second end of the grounding switch JD, and the second end of the second high voltage-resistant unit H2 is connected to the third end of the current measurement unit I5 (in this way, a test loop iii as shown in fig. 2 may be formed). The first end of the voltage measurement unit U is connected with the second end of the first high voltage withstand unit H1, the second end of the voltage measurement unit U is connected with the second end of the second high voltage withstand unit H2, and the third end of the voltage measurement unit U is connected with the processor CPU.

Based on this, in the actual test process, after the grounding switch JD is closed, the first high voltage-withstanding unit H1 is closed, and the second high voltage-withstanding unit H2 is closed, the processor CPU measures a body potential (e.g., U1) through the voltage measurement unit U, and then, may control the test signal control unit M to be closed (on) so that the signal generator DY outputs the test signal (the signal generator DY may be a power supply device), so that the processor CPU measures a test potential (e.g., U2) through the voltage measurement unit U, and measures a test current (e.g., I ₀₃ shown in fig. 2) through the current measurement unit I5, so that a corresponding loop resistance, e.g., (U2-U1)/I ₀₃, may be calculated, where by excluding the body potential U1, the interference thereof may be reduced to some extent, so that the reliability of the obtained loop resistance may be higher. In other embodiments, the body potential may not be tested, i.e., the loop resistance is U2/I ₀₃, in order to improve monitoring efficiency. In addition, after the loop resistance is obtained, the loop resistance may be compared with a reference resistance value (may be a specific resistance value or a resistance value interval), and then a closing reliability monitoring result of the grounding switch JD is obtained, for example, when the obtained loop resistance is greater than the reference resistance value, it is indicated that the closing reliability of the grounding switch JD is not high (such as a situation that the closing of the grounding switch JD is loose during a long-term use). Therefore, the loop resistance not only can represent whether a switch-on exists, but also can represent a specific switch-on condition.

In an alternative embodiment, the first high voltage-resistant unit H1 is closed and the second high voltage-resistant unit H2 is able to withstand a 10kV/1min withstand voltage when opened.

For example, in an alternative embodiment, long-term studies by the inventor of the present application have found that, when the voltage of the contact net is too high, the first high voltage resistant unit H1 and the second high voltage resistant unit H2 may be broken down, which may cause the following devices (such as the voltage measuring unit U and the current measuring unit I5) to be damaged by the high voltage, and based on this, the third monitoring module may further include an induced voltage preventing unit P1 (a switching device), wherein a first end of the induced voltage preventing unit P1 is connected to a second end of the first high voltage resistant unit H1, and a second end of the induced voltage preventing unit P1 is connected to a second end of the second high voltage resistant unit H2, for high voltage protection of the third monitoring module. Based on this, the induced voltage prevention unit P1 may be turned off during measurement, and the induced voltage prevention unit P1 may be turned on during non-measurement, so that the following devices are shorted to achieve high voltage protection of the following devices.

For example, in an alternative embodiment, the third monitoring module may further include a catenary residual voltage isolation diode (specifically connected as G1 and G2 shown in fig. 2). Therefore, in the measuring process, if the overhead contact system has residual voltage, the overhead contact system residual voltage isolation diode has the characteristic of unidirectional conduction, the reverse withstand voltage of the overhead contact system residual voltage isolation diode can reach more than 2kV, the effect of residual voltage isolation can be achieved, high-voltage isolation is realized, and the method is safer and more reliable.

The embodiment of the application also provides a loop continuity monitoring method which can be applied to the loop continuity monitoring device and can be used for monitoring the contact network grounding device.

The overhead contact system grounding device comprises overhead contact system lines, a grounding disconnecting link JD and a return rail line. The overhead line includes a first overhead line and a second overhead line, and/or the return line includes a first return line and a second return line. When the overhead contact line comprises the first overhead contact line and the second overhead contact line, the first overhead contact line and the second overhead contact line are connected in parallel between the first end of the grounding switch JD and the overhead contact line so as to form a first test loop comprising the first overhead contact line, the second overhead contact line and the overhead contact line. When the return track line comprises the first return track line and the second return track line, the first return track line and the second return track line are connected in parallel between the second end of the grounding switch JD and the return track to form a second test loop comprising the first return track line, the second return track line and the return track. In addition, the loop continuity monitoring device comprises a first monitoring module and/or a second monitoring module, wherein the first monitoring module is matched with the first test loop, and the second monitoring module is matched with the second test loop.

The specific contents of the contact net grounding device and the loop continuity monitoring device are as described in the foregoing related description, and based on this, the loop continuity monitoring method may include the following steps:

The first monitoring module may be used to monitor the loop continuity of the first test loop to obtain a corresponding first test loop continuity monitoring result, where the first test loop continuity monitoring result may be used to reflect the loop continuity of the first test loop, and if the first test loop is in a connection closed state or is not in a connection closed state; and/or

And monitoring the loop continuity of the second test loop by using the second monitoring module to obtain a corresponding second test loop continuity monitoring result, wherein the second test loop continuity monitoring result can be used for reflecting the loop continuity of the second test loop, and if the second test loop is in a connection closed state or is not in a connection closed state.

Illustratively, in an alternative embodiment, the loop continuity monitoring device further includes a processor CPU, and the first monitoring module includes a first excitation current transformer CT1 and a first monitoring current transformer CT2, where the first excitation current transformer CT1 and the first monitoring current transformer CT2 are respectively disposed in the first test loop, the first excitation current transformer CT1 generates a first induced current in the first test loop in a closed connection state in response to an input first current, and the first monitoring current transformer CT2 outputs a second current in response to the first induced current. Based on this, the step of monitoring the loop continuity of the first test loop by using the first monitoring module to obtain a corresponding first test loop continuity monitoring result may further include the following:

The processor CPU controls an external power supply to provide a first current for the first excitation current transformer CT1, and monitors whether the first monitoring current transformer CT2 outputs a second current or not;

when the processor CPU monitors that the first monitoring current transformer CT2 outputs the second current, a first testing loop continuity monitoring result used for representing that the first testing loop is in a closed connection state is output, and when the processor CPU monitors that the first monitoring current transformer CT2 does not output the second current, a first testing loop continuity monitoring result used for representing that the first testing loop is not in the closed connection state is output.

Illustratively, in an alternative embodiment, the processor CPU may close the first electronic switch K1 after receiving a measurement command (e.g., from a control device such as a ground device controller (PLC)), enable the ground continuity monitoring function, open the first electronic switch K1 after continuously measuring the current of the first test loop for 2 seconds (a specific time period may be set), and exit the continuity monitoring function.

Illustratively, in an alternative embodiment, the loop continuity monitoring device further includes a processor CPU, and the second monitoring module includes a second excitation current transformer CT3 and a second monitoring current transformer CT4, where the second excitation current transformer CT3 and the second monitoring current transformer CT4 are respectively disposed in the second test loop, the second excitation current transformer CT3 generates a second induced current in the second test loop in a closed connection state in response to an input third current, and the second monitoring current transformer CT4 outputs a fourth current in response to the second induced current. Based on this, the step of monitoring the loop continuity of the second test loop by using the second monitoring module to obtain a corresponding second test loop continuity monitoring result may further include the following steps:

The processor CPU controls an external power supply to provide a third current for the second excitation current transformer CT3 and monitors whether the second monitoring current transformer CT4 outputs a fourth current or not;

When the processor CPU monitors that the second monitoring current transformer CT4 outputs the fourth current, a second testing loop continuity monitoring result used for representing that the second testing loop is in a closed connection state is output, and when the processor CPU monitors that the second monitoring current transformer CT4 does not output the fourth current, a second testing loop continuity monitoring result used for representing that the second testing loop is not in the closed connection state is output.

Illustratively, in an alternative embodiment, the processor CPU may close the second electronic switch K2 after receiving a measurement command (e.g., from a control device such as a ground device controller (PLC)), activate the ground continuity monitoring function, continue to measure the current of the second test loop for 2 seconds (a specific time period may be set), open the second electronic switch K2, and exit the continuity monitoring function.

Illustratively, in an alternative embodiment, the loop continuity monitoring device may further include a processor CPU and a third monitoring module. The third monitoring module comprises a first high voltage-resistant unit H1, a third current-limiting resistor R3, a test signal control unit M, a signal generator DY, a current measuring unit I5, a second high voltage-resistant unit H2 and a voltage measuring unit U. The first end of the first high voltage withstand unit H1 is connected with the first end of the grounding switch JD, the first end of the third current limiting resistor R3 is connected with the second end of the first high voltage withstand unit H1, the first end of the test signal control unit M is connected with the second end of the third current limiting resistor R3, the second end of the test signal control unit M is connected with the processor CPU, the first end of the signal generator DY is connected with the third end of the test signal control unit M, the second end of the signal generator DY is connected with the processor CPU, the first end of the current measuring unit I5 is connected with the third end of the signal generator DY, the second end of the current measuring unit I5 is connected with the processor CPU, the first end of the second high voltage withstand unit JD 2 is connected with the second end of the grounding switch R3, the second end of the second high voltage withstand unit H2 is connected with the third end of the current measuring unit I5, the second end of the current measuring unit U is connected with the second end of the first high voltage withstand unit H2, and the second end of the high voltage withstand unit H is connected with the processor CPU. Based on this, the loop continuity monitoring method may further include the steps of:

after the grounding disconnecting link JD is closed, the first high voltage withstand unit H1 is closed, and the second high voltage withstand unit H2 is closed, the processor CPU controls the voltage measurement unit U to measure the voltage between the second end of the first high voltage withstand unit H1 and the second end of the second high voltage withstand unit H2, so as to obtain a first voltage;

After the first voltage is obtained, the processor CPU controls the signal generator DY to output a test current through the test signal control unit M and the third current limiting resistor R3, and controls the voltage measurement unit U to measure a voltage between the second end of the first high voltage withstand unit H1 and the second end of the second high voltage withstand unit H2 to obtain a second voltage, and controls the current measurement unit I5 to measure the test current;

the processor CPU determines a loop resistance of the earthing knife-switch JD (e.g., first calculating a voltage difference between the second voltage and the first voltage, and then calculating a ratio between the voltage difference and the test current) based on the first voltage, the second voltage and the test current, and determines a third loop continuity monitoring result corresponding to the earthing knife-switch JD based on the loop resistance.

Based on the above, in the first aspect, the connection mode of the upper and lower cables (lines) is adopted, so that the reliability of the contact net grounding device can be enhanced from the physical aspect, and meanwhile, the continuity of the cable of the contact net grounding device can be monitored conveniently. In the second aspect, the loop continuity monitoring device has small volume, and the influence on the appearance volume of the contact network grounding device is small after the loop continuity monitoring device is additionally arranged, so that the field installation requirement can be met. In the third aspect, the loop continuity monitoring device is not in direct contact with a high-voltage part in the traction power supply circuit, and when the traction power supply system operates normally, even if the loop continuity monitoring device is damaged, the normal operation of the power supply system is not affected. In a fourth aspect, the loop continuity monitoring device is flexible in functional configuration, and whether to enable the ground continuity monitoring function can be configured through the background. In the fifth aspect, the test signal can be injected within 2 seconds before and after the switch is closed (the time can be set, and the total test time is not more than 5 seconds), the test signal can be automatically withdrawn after the test is completed, and the frequency of the test signal can be customized according to the requirements of a user, so that the normal operation of a subway signal system can not be influenced. In the sixth aspect, when the measurement condition is satisfied, the single loop continuity monitoring device can satisfy the measurement function, and the measurement is not required to be performed in cooperation with external equipment, so that the reliability is high. In a seventh aspect, the continuity test of the grounding switch and the continuity test of the wiring cable can be performed independently, the starting of the test loop can be configured by software, and the test is performed in different modes before the grounding switch is closed (the continuity of the wiring cable is tested) and after the grounding switch is closed (the continuity of the grounding switch is tested), so that the test is more reliable. In an eighth aspect, specific failure points can be located: the upper wiring continuity faults (A1 and B1 shown in fig. 2), the lower wiring continuity faults (A2 and B2 shown in fig. 2) and the disconnecting link continuity faults can be conveniently overhauled.

In summary, in the contact net grounding device, the loop continuity monitoring device and the method provided by the application, the loop continuity monitoring device is used for monitoring the contact net grounding device, the contact net grounding device comprises a contact net line, a grounding disconnecting link and a return rail line, the contact net line comprises a first contact net line and a second contact net line to form a first test loop, and the return rail line comprises a first return rail line and a second return rail line to form a second test loop. The loop continuity monitoring device comprises a first monitoring module and a second monitoring module, and is used for monitoring loop continuity of the first test loop and loop continuity of the second test loop respectively. Based on the above, since the first contact net line and the second contact net line included in the contact net line can form the first test loop with the contact net, the loop continuity monitoring can be performed on the first test loop alone, and likewise, since the first return rail line and the second return rail line included in the return rail line can form the second test loop with the return rail, the loop continuity monitoring can also be performed on the second test loop alone, thus, the loop continuity monitoring with smaller granularity can be realized, the reliability of the loop continuity monitoring is improved, the abnormal positioning is facilitated (the corresponding maintenance operation can be more efficient), and the problem that the reliability of monitoring the contact net grounding device in the prior art is relatively not high can be improved. In addition, the overhead line system grounding device comprises a first overhead line system circuit, a second overhead line system circuit, a first return rail circuit and a second return rail circuit, the overhead line system grounding device is arranged on the first return rail circuit, the first return rail circuit is connected with the second return rail circuit, the second return rail circuit is connected with the first return rail circuit, the second return rail circuit is connected with the second return rail circuit, and the second return rail circuit is connected with the second return rail circuit.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. The loop continuity monitoring device is characterized by being used for monitoring a contact net grounding device, wherein the contact net grounding device comprises a contact net line, a grounding disconnecting link and a return rail line, the contact net line comprises a first contact net line and a second contact net line, and/or the return rail line comprises a first return rail line and a second return rail line;

The loop continuity monitoring device comprises a first monitoring module and/or a second monitoring module, wherein the first monitoring module is matched with the first test loop, and the first monitoring module is used for monitoring loop continuity of the first test loop; the second monitoring module is matched with the second test loop and is used for monitoring loop continuity of the second test loop;

The loop continuity monitoring device further comprises a processor, and the first monitoring module comprises a first excitation current transformer and a first monitoring current transformer, wherein the first excitation current transformer and the first monitoring current transformer are respectively arranged in the first test loop;

2. The contact net grounding device is characterized by comprising a contact net grounding device and a loop continuity monitoring device, wherein the contact net grounding device comprises a contact net line, a grounding disconnecting link and a return rail line, and the contact net line, the grounding disconnecting link and the return rail line are connected in series between the contact net and the return rail and used for performing grounding management and control on the contact net and the return rail;

The loop continuity monitoring device comprises a first monitoring module and/or a second monitoring module, wherein the first monitoring module is matched with the first test loop, and the first monitoring module is used for monitoring the loop continuity of the first test loop; the second monitoring module is matched with the second test loop and is used for monitoring loop continuity of the second test loop;

3. The catenary grounding apparatus of claim 2, wherein the loop continuity monitoring device further comprises a processor, and the second monitoring module comprises a second excitation current transformer and a second monitoring current transformer, the second excitation current transformer and the second monitoring current transformer being respectively disposed in the second test loop;

4. A catenary grounding apparatus according to any one of claims 2 to 3, wherein the loop continuity monitoring device further comprises a third monitoring module, wherein the third monitoring module is cooperatively arranged with the grounding switch and is configured to monitor the loop continuity of the grounding switch.

5. The catenary grounding apparatus of claim 4, wherein the loop continuity monitoring device further comprises a processor, and wherein the third monitoring module comprises:

6. The catenary grounding device of claim 5, wherein the third monitoring module further comprises:

7. The loop continuity monitoring method is characterized by being applied to a loop continuity monitoring device to monitor a contact network grounding device;

the loop continuity monitoring method comprises the following steps:

The second monitoring module is used for monitoring the loop continuity of the second test loop to obtain a corresponding second test loop continuity monitoring result;

The circuit continuity monitoring device further comprises a processor, the first monitoring module comprises a first excitation current transformer and a first monitoring current transformer, the first excitation current transformer and the first monitoring current transformer are respectively arranged in the first test circuit, the first excitation current transformer responds to input first current to generate first induction current in the first test circuit in a closed connection state, the first monitoring current transformer responds to the first induction current to output second current, and the circuit continuity of the first test circuit is monitored by the first monitoring module to obtain corresponding first test circuit continuity monitoring results, and the circuit continuity monitoring method comprises the following steps:

when the processor monitors that the first monitoring current transformer outputs the second current, a first testing loop continuity monitoring result used for representing that the first testing loop is in a closed connection state is output, and when the processor monitors that the first monitoring current transformer does not output the second current, a first testing loop continuity monitoring result used for representing that the first testing loop is not in the closed connection state is output.

8. The loop continuity monitoring method of claim 7, wherein the second monitoring module comprises a second excitation current transformer and a second monitoring current transformer, the second excitation current transformer and the second monitoring current transformer being respectively disposed in the second test loop, the second excitation current transformer generating a second induced current in the second test loop in a closed connection state in response to an input third current, the second monitoring current transformer outputting a fourth current in response to the second induced current;

9. The loop continuity monitoring method of claim 7, wherein the loop continuity monitoring device further comprises a processor and a third monitoring module;

The loop continuity monitoring method further comprises the following steps: