CN219611426U - Electromagnetic intelligent feeder terminal - Google Patents

Abstract

The utility model relates to an electromagnetic intelligent feeder terminal, a digital main board is respectively and electrically connected with an analog board, a line loss module, a residual voltage detection board, a traveling wave fault detection module and a DTU board, the line loss module is connected with the analog board through a wire, and the wire connected between the line loss module and the analog board passes through a sensing unit on the traveling wave fault detection module. The beneficial effects are as follows: the line loss module is connected with external input current, then the line loss module flows into the simulation board through the wire, the traveling wave fault detection module is added on the wire connected between the line loss module and the simulation board so as to collect traveling wave signals generated by the line in real time, after the distribution network line breaks down, accurate research and judgment of the fault point position can be realized, line operation and maintenance personnel are assisted in troubleshooting the fault point, quick recovery of power supply is facilitated, fine operation and maintenance of the distribution network fault is realized, compared with the traditional feeder terminal, the fault point cannot be accurately positioned, the technical situation of manual inspection is relied on, the automation degree is greatly improved, and manpower and material resources required for line inspection are saved.

Description

Electromagnetic intelligent feeder terminal

Technical Field

The utility model relates to the field of electric power, in particular to an electromagnetic intelligent feeder terminal.

Background

At present, different intelligent power grid development targets are formulated for the energy sources and the current situation of the power grid of the home country in various countries in the world, the power distribution network is used as a power source main body directly connected with users, and the development of the degree of automation of the power distribution network is also focused by electric power people in China. The distribution network lines are distributed along with users, the erection area is extremely wide, the lines are characterized by long connection and multiple branches, the distribution network lines are affected by factors such as erection environment, construction process and the like, fault tripping can be inevitably caused by the distribution network lines, and certain negative effects can be brought to people and economy after the line tripping loses power.

After a distribution network line fails, the fault point is quickly isolated, the accurate position of the fault point is accurately judged to be an extremely important ring in line operation and maintenance work, the traditional distribution network fault isolation solution adopts a manual line drawing method to determine a fault line, and after the line fails, branch lines on a bus are sequentially separated to determine the fault branch lines; in recent years, with the rapid development of intelligent power grids, the automation construction degree of the distribution network is increased year by year, at present, a feeder terminal of the distribution network is installed by selecting proper installation points of a distribution network line, the feeder terminal detects steady state and transient signals of the line in real time, and once the line breaks down, the feeder terminal automatically breaks down a fault section after a certain judgment is carried out, so that the fault fine isolation function is realized, but with the construction of a novel power distribution network, a large amount of new energy is accessed, so that the traditional feeder automation terminal gradually fails to meet the requirements of engineering application due to factors such as a research and judgment principle, and on the other hand, the signal source measurement precision of the traditional feeder automation terminal gradually fails to meet the telemetry precision requirement.

The following problems of the traditional feeder automation terminal are to be solved at present:

1) The problem that the accuracy of the research and judgment of partial faults by a steady-state method and a transient-state method is not high: the feeder automation terminals of the traditional distribution network adopt a steady state method or a transient state method to study and judge faults, but along with the access of a novel distribution network only large-area distributed power supply, the distribution network structure is directly changed from a single source to multiple sources, so that the trend of the traditional distribution network is not single any more, and the steady state method or the transient state method can not judge the faults of the novel distribution network under the access of the high distributed power supply step by step; on the other hand, the traditional feeder automation terminal basically solves the problem of metallic ground fault, but the research and judgment of high-resistance fault is still in a blank state, and the high-resistance fault cannot be accurately perceived;

2) The traditional feeder automation terminal can not realize the accurate positioning function of faults: after the distribution network line breaks down, the processing steps are fault detection, fault section isolation and manual line inspection, the function of judging the accurate position of a fault point cannot be realized based on a feeder line automation terminal, operation and maintenance personnel still need to inspect the line in a large area in the isolated section, and the current situation causes large line inspection workload after the fault and is particularly obvious in rural area.

Disclosure of Invention

The utility model aims to solve the technical problem of providing an electromagnetic intelligent feeder terminal so as to overcome the defects in the prior art.

The technical scheme for solving the technical problems is as follows: an electromagnetic intelligent feeder terminal, comprising: the digital main board is respectively and electrically connected with the analog board, the line loss module, the residual voltage detection board, the traveling wave fault detection module and the DTU board, the line loss module is connected with the analog board through a wire, and a wire connected between the line loss module and the analog board passes through a sensing unit on the traveling wave fault detection module.

The beneficial effects of the utility model are as follows: the electromagnetic intelligent feeder terminal is matched with the electromagnetic type on-column switch, the line loss module is connected with external input current, then the current flows into the simulation board through the lead, the traveling wave fault detection module is added on the lead connected between the line loss module and the simulation board to collect traveling wave signals generated by the line in real time, after the distribution network line breaks down, accurate research and judgment of the fault point position can be realized, line operation and maintenance personnel can be assisted in troubleshooting the fault point, quick power recovery is facilitated, refined operation and maintenance of the distribution network fault is realized, compared with the traditional feeder terminal, the fault point cannot be accurately positioned, the automation degree is greatly improved depending on the technical state of manual inspection, the manpower and material resources required for line inspection are saved, and the potential safety hazard caused by line inspection under partial severe conditions is avoided;

in addition, the method is compatible with the fault protection of the traditional steady-state method and the transient-state method, the traveling wave protection function is newly added, the fault type applicable to the feeder line terminal can be greatly widened, the lower limit is reduced on the basis of reliable detection of the traditional metallic fault, and the reliable perception and the research of the high-resistance fault and the single-phase grounding fault type are compatible, so that the action of the circuit breaker is more sensitive, and the reliability of detecting the distribution network fault can be improved.

On the basis of the technical scheme, the utility model can be improved as follows.

Further, a rogowski coil is adopted as a sensing unit in the traveling wave fault detection module.

Further, the intelligent control system further comprises a current interface, wherein the current interface is connected with the line loss module through a wire, and the simulation board is connected with the current interface through a wire.

Further, the method further comprises the following steps: and the power module is electrically connected with the digital main board.

The adoption of the method has the further beneficial effects that: the power is supplied to the whole terminal so as to ensure the normal operation of the terminal.

Further, the power module includes: the power supply management device comprises a power supply management module, a power supply switching board, a main board power board, a main power supply and a standby power supply, wherein the power supply management module, the power supply switching board, the main board power board and the digital main board are sequentially electrically connected, the main power supply is electrically connected with the power supply switching board, and the standby power supply is electrically connected with the power supply management module.

The adoption of the method has the further beneficial effects that: the power management module has a standby power management function, a remote activation starting and activation exiting function, and a battery low-voltage alarming and undervoltage cutting protection function;

the main board power panel is used for adjusting and optimizing the battery power supply signal so as to meet the power supply requirement of the digital main board;

the power supply switching board selects a power supply according to the detected power supply voltage signal, and if the current power supply voltage of the feeder terminal is lower than a set value, the power supply switching board automatically switches another group of power supplies so as to ensure the normal energy supply of the terminal, and in addition, the power supply mode can be monitored and regulated in real time.

Further, the power module further includes: and the operation indicator lamp is electrically connected with the main board power supply board.

The adoption of the method has the further beneficial effects that: when the terminal is powered by alternating current or standby power, and the terminal is in normal operation, the operation indicator lamp is lightened so as to intuitively acquire the operation condition.

Further, the main power supply is a lithium battery, and the standby power supply is a lithium iron phosphate storage battery; the power module further includes: the power/voltage interface and the backup power interface are respectively electrically connected with the main power supply and the backup power supply.

Further, the method further comprises the following steps: the system comprises an Ethernet communication interface, a control signal interface, a fault indicator and a display panel, wherein the Ethernet communication interface, the control signal interface and the display panel are respectively and electrically connected with a digital main board, and the fault indicator is electrically connected with a traveling wave fault detection module.

Further, the method further comprises the following steps: the shell is hollow and is provided with an opening at the bottom, and the bottom cover is fixed at the bottom of the shell and seals the opening at the bottom of the shell; the digital main board, the analog board, the line loss module, the residual voltage detection board, the traveling wave fault detection module, the DTU board, the power management module, the power switching board, the main board power board and the main power supply are respectively arranged in the shell; the standby power supply is fixed outside the shell.

The adoption of the method has the further beneficial effects that: and the sealing structure is adopted to protect the parts inside the device from being damaged by external factors.

Further, the Ethernet communication interface, the control signal interface, the current interface, the fault indicator lamp, the operation indicator lamp and the display panel are respectively embedded on the bottom cover.

Drawings

FIG. 1 is an external block diagram of an electromagnetic intelligent feeder terminal according to the present utility model;

FIG. 2 is a layout diagram of an electromagnetic intelligent feeder terminal of the present utility model on a bottom cover;

FIG. 3 is a first internal structure diagram of the electromagnetic intelligent feeder terminal according to the present utility model;

FIG. 4 is a second internal structure diagram of the electromagnetic intelligent feeder terminal according to the present utility model;

fig. 5 is a schematic diagram of an internal structure of the electromagnetic intelligent feeder terminal according to the present utility model.

In the drawings, the list of components represented by the various numbers is as follows:

1. the system comprises a digital main board, 2, an analog board, 3, a line loss module, 4, a residual voltage detection board, 5, a traveling wave fault detection module, 6, a DTU board, 7, a current interface, 8, a power module, 810, a power management module, 820, a power switching board, 830, a main board power board, 840, a main power supply, 850, a standby power supply, 860, an operation indicator lamp, 870, a power/voltage interface, 880, a backup power interface, 9, an Ethernet communication interface, 10, a control signal interface, 11, a bottom cover, 12, a fault indicator lamp, 13, a display panel, 14 and a shell.

Detailed Description

The principles and features of the present utility model are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the utility model and are not to be construed as limiting the scope of the utility model.

Example 1

As shown in fig. 1 to 5, an electromagnetic intelligent feeder terminal includes: the system comprises a digital main board 1, an analog board 2, a line loss module 3, a residual voltage detection board 4, a traveling wave fault detection module 5 and a DTU board 6; the digital main board 1 is electrically connected with the analog board 2, the digital main board 1 is electrically connected with the line loss module 3, the digital main board 1 is electrically connected with the residual voltage detection board 4, the digital main board 1 is electrically connected with the traveling wave fault detection module 5, and the digital main board 1 is electrically connected with the DTU board 6;

the line loss module 3 is connected with the simulation board 2 through a wire, the wire connected between the line loss module 3 and the simulation board 2 passes through a sensing unit on the traveling wave fault detection module 5, the traveling wave fault detection module 5 senses traveling wave signals generated by current flowing to the simulation board 2 from the line loss module 3, and the traveling wave signals are analyzed to realize accurate positioning and traveling wave protection functions of faults when the line is in fault;

the line loss module 3 is used for measuring and collecting the electric energy loss on the distribution network line;

the analog board 2 is used for collecting and processing signals of the front-end sensor, and comprises a filtering and amplifying conditioning circuit, so that the signals collected by the front end are processed for subsequent automatic analysis;

the residual voltage detection plate 4 has a residual voltage pulse detection function, can detect residual voltage pulses (the residual voltage value is 30% -100% of rated voltage, the lower limit value of pulse time is less than or equal to 40 ms) under the condition of terminal shutdown or normal operation, and is closed, and simultaneously, when time-limited power loss occurs in the power-obtaining side delayed (settable) closing process, the power-obtaining side is closed, and the power-obtaining side is not closed and is closed reversely;

the digital main board 1 is used for converting the analog signals processed by the analog board 2 into digital signals so that the DTU board 6 can be sent back to the background server for processing;

the DTU board 6 is configured to wirelessly send the acquired data back to the background server after the digitizing process, where the background server performs centralized processing on the data transmitted by the plurality of feeder terminals, and gives a more reliable research and judgment result.

Example 2

As shown in fig. 3 and 5, this embodiment is a further improvement on the basis of embodiment 1, and is specifically as follows:

the sensing unit in the traveling wave fault detection module 5 adopts a rogowski coil, a traveling wave signal is induced by the rogowski coil, and then the accurate positioning and traveling wave protection functions of faults are realized by the induced traveling wave signal.

Example 3

As shown in fig. 2 and 5, this embodiment is a further improvement on the basis of embodiment 1 or 2, and is specifically as follows:

the electromagnetic intelligent feeder terminal further comprises a current interface 7, the current interface 7 is connected with the line loss module 3 through a wire, the analog board 2 is connected with the current interface 7 through a wire, and external current signals flow to: the current interface 7 (incoming line) -line loss module 3-analog board 2-current interface 7 (outgoing line), the current interface 7 adopts six-core open-circuit-proof aviation interface for current signal access.

Example 4

As shown in fig. 5, this embodiment is a further improvement on the basis of embodiment 3, and is specifically as follows:

electromagnetic intelligent feeder terminal still includes: the power module 8, the power module 8 is connected with the digital main board 1 electricity, and the power module 8 is used for supplying power for the whole terminal to guarantee the normal operating of terminal.

Example 5

As shown in fig. 5, this embodiment is a further improvement on the basis of embodiment 4, and is specifically as follows:

the power supply module 8 includes: a power management module 810, a power switching board 820, a main board power board 830, a main power 840 and a standby power 850;

the power management module 810, the power switching board 820, the main board power board 830 and the digital main board 1 are electrically connected in sequence; the main power 840 is electrically connected to the power switching board 820, and the standby power 850 is electrically connected to the power management module 810;

the power management module 810 has a standby power 850 management function, a remote activation start and activation exit function, and a battery low-voltage alarm and undervoltage removal protection function;

the motherboard power board 830 is configured to adjust and optimize the battery power supply signal to meet the power supply requirement of the digital motherboard 1; the power switching board 820 selects a power source according to the detected power voltage signal, and if the current power voltage of the feeder terminal is lower than a set value, the power switching board automatically switches another group of power sources to ensure the normal power supply of the terminal, and in addition, the power supply mode can be monitored and regulated in real time.

The main power 840 is a power supply that can provide a stable voltage;

the backup power supply 850 provides power to the terminal as a whole while storing excess energy.

Example 6

As shown in fig. 2 and 5, this embodiment is a further improvement on the basis of embodiment 5, and is specifically as follows:

the power supply module 8 further includes: the running indicator lamp 860, the running indicator lamp 860 is electrically connected with the main board power board 830, and when the terminal ac power or the standby power 850 supplies power, and the terminal normally operates, the running indicator lamp 860 is turned on.

Example 7

As shown in fig. 3 and 5, this embodiment is a further improvement on the basis of embodiment 5 or 6, and is specifically as follows:

the main power supply 840 is a lithium battery, and the standby power supply 850 is a lithium iron phosphate storage battery; the power supply module 8 further includes: a power/voltage interface 870 and a backup power interface 880,

the power/voltage interface 870 is electrically connected with the main power supply 840, and the power/voltage interface 870 adopts six-core aviation plug for power/voltage signal access;

the backup power interface 880 is electrically connected with the backup power 850, and adopts five-core aviation plug for connecting the anode and the cathode of the backup power 850; the main power supply 840 is externally connected to a voltage transformer or ac mains through a power/voltage interface 870, and the backup power supply 850 is externally connected to a voltage transformer or ac mains through a backup power interface 880.

Example 8

As shown in fig. 2 and 5, this embodiment is a further improvement on the basis of embodiment 7, and is specifically as follows:

electromagnetic intelligent feeder terminal still includes: the Ethernet communication interface 9, the control signal interface 10, the hand-in and hand-out knob 11, the fault indicator 12 and the display panel 13;

the Ethernet communication interface 9, the control signal interface 10 and the display panel 13 are respectively and electrically connected with the digital main board 1;

the Ethernet communication interface 9 adopts Ethernet aviation plug for Ethernet communication and communication power interface;

the control signal interface 10 adopts fourteen-core aviation plug for controlling, signal and zero sequence voltage transformer interfaces;

the display panel 13 is divided into a liquid crystal panel and a non-liquid crystal panel for realizing data display;

the fault indicator 12 is electrically connected to the traveling wave fault detection module 5, and when a line fails, the fault indicator 12 flashes.

Example 9

As shown in fig. 1 and 2, this embodiment is a further improvement on the basis of embodiment 8, and is specifically as follows:

electromagnetic intelligent feeder terminal still includes: the shell 14 and the bottom cover 11, the shell 14 is hollow and has an opening at the bottom, the bottom cover 11 is fixed at the bottom of the shell 14, the bottom cover 11 seals the opening at the bottom of the shell 14, and the shell 14 is made of glass fiber reinforced plastic in general; the digital main board 1, the analog board 2, the line loss module 3, the residual voltage detection board 4, the traveling wave fault detection module 5, the DTU board 6, the power management module 810, the power switching board 820, the main board power board 830 and the main power 840 are respectively arranged in the shell 14, and the internal parts of the device are protected from being damaged by external factors by adopting a sealed structure; the backup power supply 850 is secured to the exterior of the housing 14.

Example 10

As shown in fig. 2 and 5, this embodiment is a further improvement on the basis of embodiment 9, and is specifically as follows:

the ethernet communication interface 9, the control signal interface 10, the current interface 7, the fault indicator 12, the operation indicator 860 and the display panel 13 are respectively embedded in the bottom cover 11.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (10)

1. An electromagnetic intelligent feeder terminal, comprising: digital mainboard (1), analog board (2), line loss module (3), residual voltage pick-up plate (4), travelling wave fault detection module (5) and DTU board (6), digital mainboard (1) respectively with analog board (2), line loss module (3), residual voltage pick-up plate (4), travelling wave fault detection module (5) and DTU board (6) electricity are connected, line loss module (3) are through wire connection analog board (2), line loss module (3) with the wire that is connected between analog board (2) passes the sensing unit on travelling wave fault detection module (5).

2. An electromagnetic intelligent feeder terminal according to claim 1, characterized in that the sensing unit in the travelling wave fault detection module (5) employs rogowski coils.

3. An electromagnetic intelligent feeder terminal according to claim 1, further comprising a current interface (7), the current interface (7) being connected to the line loss module (3) by a wire, the analog board (2) being connected to the current interface (7) by a wire.

4. An electromagnetic intelligent feeder terminal according to claim 2, further comprising: the power module (8), the power module (8) with digital motherboard (1) electricity is connected.

5. An electromagnetic intelligent feeder terminal according to claim 4, characterized in that said power supply module (8) comprises: the power management system comprises a power management module (810), a power switching board (820), a main board power board (830), a main power source (840) and a standby power source (850), wherein the power management module (810), the power switching board (820), the main board power board (830) and the digital main board (1) are sequentially electrically connected, the main power source (840) is electrically connected with the power switching board (820), and the standby power source (850) is electrically connected with the power management module (810).

6. An electromagnetic intelligent feeder terminal according to claim 5, characterized in that said power supply module (8) further comprises: and the running indicator lamp (860) is electrically connected with the main board power panel (830).

7. The electromagnetic intelligent feeder terminal of claim 6, wherein the primary power source (840) is a lithium battery and the backup power source (850) is a lithium iron phosphate battery; the power supply module (8) further comprises: a power/voltage interface (870) and a backup power interface (880), the power/voltage interface (870) and backup power interface (880) being electrically connected to the primary power source (840) and backup power source (850), respectively.

8. The electromagnetic intelligent feeder terminal of claim 7, further comprising: the system comprises an Ethernet communication interface (9), a control signal interface (10), a fault indicator lamp (12) and a display panel (13), wherein the Ethernet communication interface (9), the control signal interface (10) and the display panel (13) are respectively and electrically connected with a digital main board (1), and the fault indicator lamp (12) is electrically connected with a traveling wave fault detection module (5).

9. The electromagnetic intelligent feeder terminal of claim 8, further comprising: a shell (14) and a bottom cover (11), wherein the shell (14) is hollow and is provided with an opening at the bottom, and the bottom cover (11) is fixed at the bottom of the shell (14) and seals the opening at the bottom of the shell (14); the digital main board (1), the analog board (2), the line loss module (3), the residual voltage detection board (4), the traveling wave fault detection module (5), the DTU board (6), the power management module (810), the power switching board (820), the main board power board (830) and the main power supply (840) are respectively arranged in the shell (14); the backup power supply (850) is secured to the exterior of the housing (14).

10. An electromagnetic intelligent feeder terminal according to claim 9, wherein the ethernet communication interface (9), the control signal interface (10), the current interface (7), the fault indicator lamp (12), the running indicator lamp (860) and the display panel (13) are respectively embedded in the bottom cover (11).