CN110853990B - Single-phase recloser and three-phase linkage device and method - Google Patents

Abstract

The invention discloses a single-phase recloser, a three-phase linkage device and a method, wherein the single-phase recloser comprises a current sensor, a power-taking voltage sensor, a measuring voltage sensor and a switch unit; one end of the switch unit is provided with a rotary pin shaft, and the switch unit can axially rotate along the pin shaft to enable the conductive contact and the isolation static contact seat to be in a conducting or disconnecting state; the incoming line end gets electric voltage sensor and supports the insulator and casts as an organic whole, and the outgoing line end measures the electric voltage sensor and supports the insulator and casts as an organic whole, and the power supply continuity is not influenced by switchgear deciliter state. A three-phase linkage assembly collection analysis module; the three-phase linkage method is that three single-phase reclosers are respectively connected in series in a three-phase line, a collection unit receives signals, an analysis module analyzes the signals, if the signals need to be acted when the faults are judged, and a communication module of the collection analysis module sends instructions to each single-phase recloser; and after receiving the command, each single-phase recloser acts according to the command.

Description

Single-phase recloser and three-phase linkage device and method

Technical Field

The invention belongs to the field of fault detection and isolation of power systems, and particularly relates to a single-phase recloser and three-phase linkage device and method.

Background

In a power distribution network system, a single-phase recloser is used as a device capable of quickly switching on and off a short-circuit fault for multiple times in a short time, and is widely applied to distribution network branch lines, so that a line protection function is realized, and power supply reliability is provided. Currently, the mainstream of the single-phase recloser in the world has two structural forms: a drop-out recloser and a strut-type recloser.

The drop-out single-phase recloser is most typical of a TripSaver II product of Schenxi, and when a short-circuit fault occurs, the drop-out recloser can reclose according to a preset action sequence. If the fault is a transient fault, the product can remove the fault through reclosing. And if the fault is a non-transient fault, the recloser falls off to form a visible fracture, and the fault is isolated. The recloser with the structure can be used for replacing a fuse and has the advantage of being reusable.

For a TripSaver II type drop-out recloser of Schenxi, CT is adopted for power taking, the current of a general line of a distribution network main line meets the power taking requirement, but for a user branch line, most lines and most time cannot meet the current requirement of CT power taking, and the application range of the single-phase recloser is greatly limited; moreover, a voltage transformer is not configured in the product, and the product cannot realize the metering function and the electricity stealing prevention function; meanwhile, the three-phase power supply does not have an electrical linkage function and cannot be used in a three-phase circuit.

The strut-type single-phase recloser is most typically represented by the GridShield type product of ABB, and adopts a permanent magnet mechanism and vacuum arc extinguishing. The arc extinguish chamber is poured in the support sleeve and is connected with the permanent magnet mechanism through the insulating pull rod. The post insulator is vertically installed on a mechanism box, and the mechanism box contains components such as a permanent magnet mechanism, a control unit and the like. The support column type single-phase recloser has the advantages of simple structure, convenience in installation and maintenance, long mechanical service life, more purchasing resources of matched parts and the like.

For the strut type recloser of the ABB, the power is obtained by adopting an external power supply instead of an automatic power obtaining structure. For some lines that cannot provide AC power, it will not be used; moreover, the structure has no visible fracture, and the safety of maintenance operation can be ensured only by additionally arranging an isolating switch.

Disclosure of Invention

The purpose of the invention is as follows: aiming at the problems, the invention provides a single-phase recloser and three-phase linkage device and method, which can realize visible fracture of a switch unit of the recloser and realize three-phase linkage.

The technical scheme is as follows: in order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows: a single-phase recloser comprises an incoming line terminal, a current transformer, a power-taking voltage transformer, a control box, a conductive rod, a conductive sheet, a pressure spring, a conductive contact, a vacuum arc-extinguishing chamber, an insulating pull rod, a contact spring, a permanent magnet mechanism, a conductive terminal, a rotary pressing plate, a rotary hook, an outgoing line terminal, a flexible connection, a conductive plate and a measuring voltage sensor;

the high-voltage wire is connected with the single-phase recloser through the incoming line terminal, the incoming line terminal is connected with the conducting rod, and the current transformer is arranged on the incoming line side and penetrates through the conducting rod; the conductive rod is connected with the conductive sheet in the isolation static contact seat through a bolt, the conductive contact of the switch unit is connected with the conductive sheet in the isolation static contact seat, and the pressure spring in the isolation static contact seat presses the conductive sheet to enable the conductive sheet to be in close contact with the conductive contact;

the switch unit comprises a conductive contact, a vacuum arc-extinguishing chamber, an insulating pull rod, a contact spring, a permanent magnet mechanism and a conductive terminal; the vacuum arc extinguish chamber, the insulating pull rod, the contact spring and the permanent magnet mechanism are positioned in the shell of the switch unit; the conductive contact is connected to the upper end of the vacuum arc-extinguishing chamber, and the lower end of the vacuum arc-extinguishing chamber is connected to the insulating pull rod; the contact spring is pressed on the insulating pull rod in a penetrating mode, and the insulating pull rod is connected with the permanent magnet mechanism; the conductive terminal extends out from the middle part of the switch unit shell, and the lower movable end of the vacuum arc extinguish chamber is connected to the conductive terminal through flexible connection;

the conductive terminal is connected with one end of the rotary pressure plate through a bolt, the other end of the rotary pressure plate is provided with a rotary pin shaft, the rotary pin shaft is connected to the rotary hook in a pressing mode, and the switch unit can axially rotate along the rotary pin shaft; the rotary hook is provided with a wire outlet terminal, the conductive terminal is connected with the wire outlet terminal through a flexible connection, and the conductive plate is connected with the wire outlet terminal through a bolt;

the primary side of the power-taking voltage transformer is connected with the conducting rod through a conducting wire, and the secondary side of the power-taking voltage transformer is connected with the control box; the primary side of the measuring voltage sensor is connected with the conducting plate through a conducting wire, and the secondary side of the measuring voltage transformer is connected with the control box.

Furthermore, the power-taking voltage transformer and the supporting insulator are cast into a whole, and the current transformer and the power-taking voltage transformer are integrally formed.

Further, an open pin shaft socket is arranged on the rotary hook, and the switch unit can be integrally separated from the equipment by separating the rotary pin shaft from the open pin shaft socket.

Further, the measuring voltage sensor is cast with the support insulator as a whole.

A three-phase linkage device based on a single-phase recloser comprises the single-phase recloser and a collection analysis module; the single-phase recloser comprises a control box, and the collection analysis module comprises a collection unit, an analysis module and a communication module; current and voltage signals collected by a current transformer and a measuring voltage transformer in the single-phase recloser are sent to a control box of the single-phase recloser and are transmitted to a collecting unit of a collecting and analyzing module through a communication module in the control box; the collecting unit receives the signals and sends the signals to the analysis module, and the analysis module analyzes the signals and judges whether the signals are in failure; if the fault needs to be judged to act, sending an instruction to each single-phase recloser through a communication module of the collection analysis module; and after receiving the command, each single-phase recloser acts according to the command.

A three-phase linkage method based on a single-phase recloser comprises the following steps:

(1) a current transformer and a measuring voltage transformer in the single-phase recloser collect current and voltage signals and send the current and voltage signals to a control box of the single-phase recloser, and the current and voltage signals are transmitted to a collecting unit of a collecting and analyzing module through a communication module in the control box;

(2) the collecting unit receives the signals and sends the signals to the analysis module, and the analysis module analyzes the signals and judges whether the signals are in failure;

(3) if the fault needs to be judged to act, sending an instruction to each single-phase recloser through a communication module of the collection analysis module; and after receiving the command, each single-phase recloser acts according to the command.

Has the advantages that: the inlet end of the single-phase recloser is provided with the power taking voltage sensor and the supporting insulator which are cast into a whole, the outlet end measuring voltage sensor and the supporting insulator are cast into a whole, the power supply continuity is not influenced by the on-off state of the switch device, and the single-phase recloser can be used as an isolation insulating support between the high potential and the low potential of the switch unit and the control unit.

One end of the switch unit of the single-phase recloser is provided with the rotary pin shaft, the switch unit can axially rotate along the pin shaft, the switch unit is enabled to rotate along the design direction, the conductive contact and the isolation static contact seat are enabled to be in a conducting or disconnecting state, the rotation angle of the switch unit is controlled, the specified distance can be achieved between the conductive contact and the isolation static contact seat of the switch unit, an isolation fracture of the switch is formed, the structure is simple, and the manufacturing cost is low. And the switch unit can be separated from the switch equipment by separating the rotating pin shaft from the open pin shaft nest, so that the switch unit is convenient to maintain.

The single-phase recloser can be applied to a three-phase line, and three single-phase reclosers are respectively connected in series in the three-phase line to realize three-phase linkage.

Drawings

FIG. 1 is a schematic diagram of a monophasic recloser configuration;

FIG. 2 is a schematic view of the switch unit rotating axially along the pivot pin;

FIG. 3 is a schematic diagram of a disconnected switching unit;

FIG. 4 is a schematic diagram of a primary circuit of a single-phase recloser;

fig. 5 is a schematic diagram of a three-phase linkage function.

Detailed Description

The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.

As shown in fig. 1, the single-phase recloser of the invention comprises an incoming line terminal 1, a current transformer 2, an incoming voltage transformer 3, a control box 4, a conducting strip 5, a pressure spring 6, a conducting contact 7, a vacuum arc-extinguishing chamber 8, an insulating pull rod 9, a contact spring 10, a permanent magnet mechanism 11, a conducting terminal 12, a rotary pressing plate 13, a rotary hook 14, an outgoing line terminal 15, a measuring voltage sensor 16, a conducting rod 17, a flexible connection 18 and a conducting plate 19.

The high-voltage wire is connected with the single-phase recloser through the incoming line terminal 1, the incoming line terminal 1 is connected with the conducting rod 17, and the current transformer 2 is arranged on the incoming line side and penetrates through the conducting rod 17; the conducting rod 17 is connected with the conducting strip 5 in the isolation static contact seat through a bolt, the conducting contact 7 of the switch unit is connected with the conducting strip 5 in the isolation static contact seat, and the pressure spring 6 in the isolation static contact seat presses the conducting strip 5, so that the conducting strip 5 is in close contact with the conducting contact 7.

The switch unit comprises a conductive contact 7, a vacuum arc-extinguishing chamber 8, an insulating pull rod 9, a contact spring 10, a permanent magnet mechanism 11 and a conductive terminal 12; the vacuum arc extinguish chamber 8, the insulating pull rod 9, the contact spring 10 and the permanent magnet mechanism 11 are positioned inside a shell of the switch unit; the conductive contact 7 is connected to the upper end of the vacuum arc-extinguishing chamber 8, and the lower end of the vacuum arc-extinguishing chamber 8 is connected to the insulating pull rod 9; the contact spring 10 penetrates through and is pressed on the insulating pull rod 9, and the insulating pull rod 9 is connected with the permanent magnet mechanism 11; the conductive terminal 12 extends from the middle of the switch unit shell, and the lower movable end of the vacuum arc-extinguishing chamber 8 is connected with the conductive terminal 12 through a flexible connection 18.

The conductive terminal 12 is connected with one end of the rotary pressure plate 13 through a bolt, the other end of the rotary pressure plate 13 is provided with a rotary pin shaft, the rotary pin shaft is connected on the rotary hook 14 in a pressing mode, and the switch unit can axially rotate along the rotary pin shaft, as shown in fig. 2; the rotary hook 14 is provided with an outlet terminal 15, the conductive terminal 12 is connected with the outlet terminal 15 through a flexible connection 18, and the conductive plate 19 is connected with the outlet terminal 15 through a bolt.

One end of the switch unit is designed as a rotary pin shaft, the other end of the switch unit is designed as a conductive contact and is connected with the equipment through the pin shaft, the switch unit can rotate along the axial direction of the pin shaft, the switch unit can rotate along the design direction, the contact at the other end and the isolation static contact seat are in a conducting or disconnecting state, the rotation angle of the switch unit is controlled, the specified distance can be realized between the conductive contact of the switch unit and the isolation static contact seat, and an isolation fracture of the switch is formed. The single-phase recloser has the advantages of small volume, light weight, simple and convenient installation, simple structure and low manufacturing cost.

The rotating hook 14 is provided with an open pin socket, and the switch unit can be separated from the whole equipment by separating the rotating pin from the open pin socket, as shown in fig. 3, so that the maintenance of the switch unit is convenient.

The primary side of the power-taking voltage transformer 3 is connected with the conducting rod 17 through a conducting wire, and the secondary side of the power-taking voltage transformer 3 is connected with the control box 4; the primary side of the measuring voltage sensor 16 is connected with the conductive plate 19 through a lead, and the secondary side of the measuring voltage transformer 16 is connected with the control box 4.

The power-taking voltage transformer 3 and the supporting insulator are cast into a whole, and the current transformer 2 and the power-taking voltage transformer 3 are integrally formed. The current sensor at the incoming line end of the equipment is a part which cannot be normally disassembled, so that the occurrence of malicious electricity stealing behaviors is structurally avoided. The current sensor and the voltage sensor are both in integrated structural design, and an isolation stationary contact seat of the equipment is further integrated, so that the equipment structure is further simplified, and the manufacturing cost is reduced.

The power-taking voltage sensor is connected with the equipment wire inlet end in series and is cast with the equipment supporting insulator into a whole, the power supply continuity is not influenced by the on-off state of the equipment, and meanwhile, the power-taking voltage sensor can be used as an isolation insulating support between a high potential and a low potential of the switch unit and the control unit, and has simple structure and low manufacturing cost.

The device output end is supported by another supporting insulator, the measuring voltage sensor 16 and the supporting insulator are cast into a whole, namely, the measuring voltage sensor is integrated in the supporting insulator, the high-voltage end of the measuring voltage sensor is connected with the conducting plate 19, and the low-voltage end of the measuring voltage sensor is a measuring signal output end and provides signals for the distribution automation control terminal. The low potential end face of the integrated wire outlet end is provided with a signal output port and an end face sealing structure, and the sealing structure is formed by the sealing ring and the distribution control terminal box body, so that the environmental factor pairing is avoided while the signal transmission is ensured. The invention adopts the integrally designed electronic PT power taking, thereby greatly increasing the application scenes.

The single-phase recloser can be connected in series in a single-phase high-voltage line for use, and a primary loop is shown in figure 4 and has the function of bearing load current. When the single-phase recloser works under the condition of bearing load current, the single-phase recloser is in a switching-on position, rated working current not greater than 200A can be borne for a long time, and short-circuit current not greater than 6kA can be borne for a short time.

The single-phase recloser has a short-circuit fault cut-off function, when a short-circuit fault occurs, short-circuit current flows through the single-phase recloser, then a current transformer 2 transmits a short-circuit current signal to a terminal in a control box 4, the terminal processes information and activates a brake-separating control loop, so that a permanent magnet mechanism 11 performs brake-separating action, the permanent magnet mechanism 11 performs brake-separating to drive an insulating pull rod 9 to move towards a brake-separating position, the insulating pull rod 9 drives a vacuum arc-extinguishing chamber 8 to move towards the brake-separating position, electric arc extinguishing is completed at the same time, and the short-circuit fault is cut off.

As shown in fig. 5, the single-phase recloser can be applied to a three-phase line, and three single-phase reclosers are respectively connected in series in the three-phase line to realize three-phase linkage. The three-phase linkage device based on the single-phase recloser comprises the single-phase recloser and a collection analysis module; the collection analysis module comprises a collection unit, an analysis module and a communication module.

Under the support of a high-precision mutual inductor, each phase recloser can acquire the current and voltage waveforms of the line in real time. A current signal acquired by a current transformer in the single-phase recloser is transmitted to a control box; a measuring voltage transformer in the single-phase recloser collects a voltage signal and transmits the voltage signal to a control box; and is transmitted to a collecting unit of a collecting analysis module through a communication module in the control box. And each single-phase recloser control box is provided with a communication module based on an RF technology, and the three-phase communication delay is less than or equal to 100us under the support of a three-phase synchronous clock technology.

The three-phase synchronous clock technology is that each time interval passes, the collecting unit sends a time setting instruction to each single-phase recloser through the RF communication module, the wireless communication is electromagnetic wave transmission, the transmission speed is light speed, the time between the time when the collecting unit sends the instruction and the time when the single-phase recloser receives the instruction is negligible, and the three phases almost simultaneously receive the time setting instruction and set time.

Through calculation and experimental verification, when the time interval is set to be 5s, the three-phase communication delay can be stably realized to be less than or equal to 100us, and the power consumption of the product can be ensured to be within an acceptable range. For the single-phase recloser, the switching-on and switching-off time is generally 20 ms-60 ms, and compared with the communication delay, the communication delay can be ignored, so that the synchronous action of the three single-phase reclosers can be well realized by utilizing the three-phase synchronous clock technology.

When short-circuit fault occurs, the voltage and current sensors in the single-phase recloser can send voltage and current information in a line to the collecting unit through the RF wireless communication module. The collecting unit receives the signals and sends the signals to the analysis module, the analysis module analyzes the data, when the analysis result is judged to be a fault, an action needs to be made, and then the communication module of the collecting analysis module sends an instruction to each single-phase recloser. After each single-phase recloser receives the command, the single-phase reclosers act according to the command, and therefore three-phase linkage is achieved.

Claims (6)

1. A single-phase recloser is characterized by comprising a wire inlet terminal (1), a current transformer (2), a current taking voltage transformer (3), a control box (4), a conductive rod (17), a conductive plate (5), a pressure spring (6), a conductive contact (7), a vacuum arc-extinguishing chamber (8), an insulating pull rod (9), a contact spring (10), a permanent magnet mechanism (11), a conductive terminal (12), a rotary pressure plate (13), a rotary hook (14), a wire outlet terminal (15), a flexible connection (18), a conductive plate (19) and a measuring voltage sensor (16);

the high-voltage wire is connected with the single-phase recloser through the incoming line terminal (1), the incoming line terminal (1) is connected with the conducting rod (17), and the current transformer (2) is arranged on the incoming line side and penetrates through the conducting rod (17); the conducting rod (17) is connected with the conducting strip (5) in the isolation static contact seat through a bolt, the conducting contact (7) of the switch unit is connected with the conducting strip (5) in the isolation static contact seat, and the pressure spring (6) in the isolation static contact seat presses the conducting strip (5) to enable the conducting strip (5) to be in close contact with the conducting contact (7);

the switch unit comprises a conductive contact (7), a vacuum arc-extinguishing chamber (8), an insulating pull rod (9), a contact spring (10), a permanent magnet mechanism (11) and a conductive terminal (12); the vacuum arc extinguish chamber (8), the insulating pull rod (9), the contact spring (10) and the permanent magnet mechanism (11) are positioned inside a shell of the switch unit; the conductive contact (7) is connected to the upper end of the vacuum arc-extinguishing chamber (8), and the lower end of the vacuum arc-extinguishing chamber (8) is connected to the insulating pull rod (9); the contact spring (10) penetrates through and is pressed on the insulating pull rod (9), and the insulating pull rod (9) is connected with the permanent magnet mechanism (11); the conductive terminal (12) extends out from the middle part of the switch unit shell, and the movable end at the lower end of the vacuum arc-extinguishing chamber (8) is connected to the conductive terminal (12) through a flexible connection (18);

the conductive terminal (12) is connected with one end of a rotary pressure plate (13) through a bolt, the other end of the rotary pressure plate (13) is provided with a rotary pin shaft, the rotary pin shaft is connected to a rotary hook (14) in a pressing mode, and the switch unit can axially rotate along the rotary pin shaft; an outlet terminal (15) is arranged on the rotary hook (14), the conductive terminal (12) is connected with the outlet terminal (15) through a flexible connection (18), and the conductive plate (19) is connected with the outlet terminal (15) through a bolt;

the primary side of the power-taking voltage transformer (3) is connected with the conducting rod (17) through a conducting wire, and the secondary side of the power-taking voltage transformer (3) is connected with the control box (4); the primary side of the measuring voltage sensor (16) is connected with the conductive plate (19) through a lead, and the secondary side of the measuring voltage sensor (16) is connected with the control box (4).

2. The single-phase recloser according to claim 1, wherein the current-taking voltage transformer (3) is cast in one piece with the support insulator, the current transformer (2) being formed in one piece with the current-taking voltage transformer (3).

3. The single-phase recloser according to claim 1, wherein the swing hook (14) is provided with an open pin recess, and the switch unit is integrally separable from the apparatus by separating the swing pin from the open pin recess.

4. Single-phase recloser according to claim 1, characterized in that the measuring voltage sensor (16) is cast in one piece with the support insulator.

5. A three-phase linkage device based on the single-phase recloser of any one of claims 1-4, characterized by comprising the single-phase recloser and a collection analysis module; the single-phase recloser comprises a control box, and the collection analysis module comprises a collection unit, an analysis module and a communication module;

current and voltage signals collected by a current transformer and a measuring voltage sensor in the single-phase recloser are sent to a control box of the single-phase recloser and are transmitted to a collecting unit of a collecting and analyzing module through a communication module in the control box;

the collecting unit receives the signals and sends the signals to the analysis module, and the analysis module analyzes the signals and judges whether the signals are in failure; if the fault needs to be judged to act, sending an instruction to each single-phase recloser through a communication module of the collection analysis module; and after receiving the command, each single-phase recloser acts according to the command.

6. A three-phase linkage method based on the single-phase recloser of any of claims 1-4, characterized by comprising the steps of:

(1) a current transformer and a measuring voltage sensor in the single-phase recloser collect current and voltage signals and send the current and voltage signals to a control box of the single-phase recloser, and the current and voltage signals are transmitted to a collecting unit of a collecting and analyzing module through a communication module in the control box;

(2) the collecting unit receives the signals and sends the signals to the analysis module, and the analysis module analyzes the signals and judges whether the signals are in failure;

(3) if the fault needs to be judged to act, sending an instruction to each single-phase recloser through a communication module of the collection analysis module; and after receiving the command, each single-phase recloser acts according to the command.

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