CN206650433U - High-speed switch extinguishing arc and protecting human body system - Google Patents

Abstract

The utility model relates to a fast switch arc suppression and human body protection system. Its characteristics are: including the line selection arc suppression device in the station, the line selection arc suppression device in the station is respectively connected with the arc suppression device outside the station, the line selection device of the first substation and the line selection device of the second substation through the communication center module; The line selection arc suppression device includes a first controller, which is connected to the busbar through a voltage acquisition module to collect the three-phase voltage of the busbar and the zero-sequence voltage of the busbar, and the first controller is also connected to each outgoing line of the substation through the current acquisition module Connect to collect the zero-sequence current of each outgoing line, and also include the first split-phase fast switch. The utility model grounds the first and last ends of the faulty grounding point through a phase-splitting fast switch and transfers the faulty grounding current within 10ms, and limits the voltage of the faulty grounding to below 36V, thereby effectively eliminating arcs and protecting the human body effect.

Description

Quick switch arc suppression and human body protection system

technical field

The utility model relates to a fast switch arc suppression and human body protection system.

Background technique

The selection of the neutral point grounding method of the distribution network is closely related to the reliability, enthusiasm and life safety of the power system. There are three ways of grounding the neutral point of my country's distribution network: non-grounding, grounding through arc suppression coils and resistive grounding. According to the relevant opinions of the national standard "GB 50613-2010" and the enterprise standard "QGDW 1738-2012" of the State Grid Corporation of China, the neutral point grounding method is mainly based on factors such as voltage level, single-phase grounding capacitance current, and type of distribution line. choose. Among them, the arc suppressing coil grounding method is generally adopted in the distribution network at the present stage.

The arc suppressing coil connected to the neutral point can compensate the current of single-phase grounding, the arc is easy to extinguish and is not suitable for re-ignition, shortens the duration of intermittent arc overvoltage, and suppresses the generation of arc grounding overvoltage. However, there are deficiencies in the grounding method of the arc suppression coil: 1) The arc suppression coil generally works in an overcompensated state. When the system capacitive current is too large, the residual fault point does not meet the requirements for safe operation of the system; the arc suppression coil can only compensate for power frequency component, when the system is grounded through the arc suppression coil, the current flowing through the fault point has a high-frequency oscillation component in addition to the power frequency component. When the power frequency current crosses zero, the high-frequency oscillation current still has a large amplitude, which cannot be completely 2) After the arc suppression coil is compensated, the fault current characteristics become smaller, resulting in a decrease in the accuracy of fault line selection, which brings certain difficulties for operation and maintenance personnel to troubleshoot; 3) Cable line faults are usually permanent faults. In the distribution network with many cable lines, the repeated arc extinguishing of the arc suppression coil compensation method will expand the scope of the accident, resulting in complete damage to the cable insulation; 4) The arc suppression coil compensation method is to compensate the capacitive current of the system through inductive current, which cannot In the case of electric shock to the human body, real current transfer cannot be effectively protected for personal safety.

At present, from the perspective of single-phase ground fault processing technology and human body protection technology at home and abroad, there is no device that can effectively protect the safety of personal electric shock on 10kV or 35kV lines.

Utility model content

The purpose of this utility model is to provide a fast switch arc suppression and human body protection system, which can play the role of arc suppression and human body protection, so as to effectively protect the safety of personal electric shock on 10kV or 35kV lines.

A fast switch arc suppression and human body protection system, which is special in that it includes an arc suppression device for line selection in the station, and the arc suppression device for line selection in the station communicates with the arc suppression device outside the station and the line selection for the first-level substation respectively through the communication center module. The device is connected to the line selection device of the secondary substation; the line selection arc suppression device in the station includes a first controller, which is connected to the bus through a voltage acquisition module to collect the three-phase voltage of the bus and the zero-sequence voltage of the bus. A controller is also connected to each outgoing line of the substation through the current acquisition module to collect the zero-sequence current of each outgoing line, and also includes a first split-phase fast switch, the input end of the first split-phase fast switch is connected to the three-phase bus and the The output end of the first split-phase fast switch is grounded through the protection module, and the control end of the first split-phase fast switch is connected to the aforementioned first controller; wherein the arc suppression device outside the station includes a second controller, and the second control The device is connected with the aforementioned first controller, and also includes a second phase-splitting fast switch, the input end of the second phase-splitting fast switch is connected to the power distribution line in three phases, and the output end of the second phase-splitting fast switch passes through the protection module grounded, and the control end of the second phase-splitting fast switch is connected to the aforementioned second controller.

Wherein the first-level substation line selection device includes a first data processing module, and the first data processing module is respectively connected with the first power supply module, the first display module, the first line selection module and the first communication module, wherein the first line selection module The module is connected to the zero-sequence current loop of each feeder in the ring network cabinet of the primary substation, wherein the first communication module is connected to the first controller through an optical fiber; the line selection device of the secondary substation includes a second data processing module, the first The second data processing module is respectively connected with the second power supply module, the second display module, the second line selection module and the second communication module, wherein the second line selection module is connected with the zero-sequence current loop of each feeder in the ring network cabinet of the secondary substation connection, wherein the second communication module is connected to the first controller through an optical fiber.

The protection module adopts lightning arrester.

The fault phase short-term grounding arc suppression and human body protection system described in the utility model mainly uses the line selection arc suppression device in the station to quickly judge the single-phase ground fault phase and the fault line, and through the phase-splitting fast switch in the station line selection device The faulty phase is grounded for a short time, and the faulty phase and faulty line selection are transmitted to the arc suppression device outside the station through optical fiber. After the arc suppression device outside the station receives the signal, it quickly grounds the faulty phase through the phase-separated fast switch. Limiting the voltage of limiting fault grounding to below 36V plays an effective role in arc suppression and human body protection.

Description of drawings

Fig. 1 is the principle diagram of the line selection arc suppression device in the station of the utility model;

Fig. 2 is a schematic diagram of the arc suppression device outside the station in the utility model;

Fig. 3 is a schematic diagram of the utility model.

detailed description

As shown in Figures 1, 2 and 3, the utility model provides a fast switch arc suppression and human body protection system, including a line selection arc suppression device in the station. The arc device, the first-level substation line selection device and the second-level substation line selection device are connected;

Among them, the line selection arc suppression device in the station includes a first controller, which is connected to the busbar through a voltage acquisition module to collect the three-phase voltage of the busbar and the zero-sequence voltage of the busbar, and the first controller is also connected to each substation through the current acquisition module connected to each outgoing line so as to collect the zero-sequence current of each outgoing line, and also includes a first split-phase fast switch, the input end of the first split-phase fast switch is connected to the bus in three phases and the output end of the first split-phase fast switch is protected by The module is grounded, and the control end of the first phase-splitting fast switch is connected to the aforementioned first controller;

The arc suppression device outside the station includes a second controller, which is connected to the aforementioned first controller, and also includes a second split-phase fast switch, whose input end is connected to the power distribution line three The output terminal of the second phase-splitting fast switch is connected to the ground through the protection module, and the control terminal of the second phase-splitting fast switch is connected to the aforementioned second controller.

The first-level substation line selection device is composed of the first power supply module, the first display module, the first line selection module, the first data processing module and the first communication module, and the first power supply module provides various voltages required by the device circuit At the same time, the module board is integrated with a relay for alarm output; the first display module is used to collect the zero-sequence voltage of the opening, display, data storage and data remote transmission; the first line selection module is responsible for each in the first ring network cabinet. Sampling of the feeder zero-sequence current loop; the first data processing module is responsible for distinguishing the faulty feeder; the first communication module is responsible for transmitting the identified faulty feeder information to the first controller through optical fiber.

The line selection device of the secondary substation is composed of a second power supply module, a second display module, a second line selection module, a second data processing module and a second communication module, and the second power supply module provides various voltages required by the device circuit At the same time, the module board is integrated with a relay for alarm output; the second display module is used to collect the zero-sequence voltage of the opening, display, data storage and data remote transmission; the second line selection module is responsible for each Sampling of the feeder zero-sequence current loop; the second data processing module is responsible for distinguishing the faulty feeder; the second communication module is responsible for transmitting the identified faulty feeder information to the first controller through the optical fiber.

Among them, the protection module uses lightning arresters to protect the arc suppression device for line selection in the station from overvoltage.

Below in conjunction with accompanying drawing and specific implementation method, the utility model patent is described in further detail:

As shown in Figure 1, the line selection arc suppression device in the station is installed on the busbar of the substation, and mainly includes the first controller; the first phase split quick switch; and the protection module. Wherein the first controller receives external current and voltage signals and performs fault phase identification and fault line judgment. The external current and voltage signals include bus three-phase voltage Ua, Ub, Uc and bus zero-sequence voltage U0, and zero-sequence current I01~I0n of each outgoing line of the substation. Where n is the number of feeders. After the first controller distinguishes the faulty phase, it sends a corresponding command to the first split-phase fast switch to ground the faulty phase through the fast switch to transfer the fault current to eliminate the arc overvoltage.

The first split-phase fast switch uses an electromagnetic repulsion mechanism as the operating mechanism to increase the speed of action. The time for the first controller to identify the faulty phase and control the first phase-splitting fast switch to be switched on is less than 10 ms. The protection module mainly performs overvoltage and short circuit protection for the line selection arc suppression device in the station.

As shown in Figure 2, the arc suppression device outside the station is installed on the 10kV or 35kV distribution network line, and mainly includes the second controller; the second phase split quick switch; and the protection module. When a single-phase ground fault occurs on the line, the second controller receives the control signal of the line selection arc suppression device in the station, and controls the corresponding phase-specific actions of the second phase split quick switch. The second controller accepts the command of the line selection arc suppression device in the station and controls the second split-phase fast switch to be switched on for less than 10ms. The second split-phase fast switch uses an electromagnetic repulsion mechanism as the operating mechanism to increase the speed of action. The protection module mainly performs overvoltage and short circuit protection for the line selection arc suppression device in the station.

As shown in Figure 3, the fault phase short-time grounding arc suppression and human body protection system structure diagram mainly includes the arc suppression device for line selection in the station; the arc suppression device outside the station; the line selection device for the first-level substation; the line selection device for the second-level substation ; Communication center module.

The line selection arc suppression device in the station is mainly used to distinguish the fault phase and the fault line when a single-phase ground fault occurs, and control the split-phase fast switch to be put into operation. The external arc suppression device mainly accepts the control commands of the line selection arc suppression device in the station , to control the split-phase fast switch input, the line selection device of the first substation and the line selection device of the second substation cooperate with the line selection arc suppression device in the station to distinguish the fault phase and the fault line. The information exchange between the line selection arc suppression device inside the station, the arc suppression device outside the station, the line selection device of the first-level substation, and the line selection device of the second-level substation is carried out through the communication center module, and the optical fiber communication is adopted.

Using method and working principle of the present utility model are:

When an electric shock accident occurs in a phase of the fault ground point as shown in Figure 3, the current of the fault feeder will change. The first controller grounds the faulty phase of the first split-phase fast switch; the line selection device of the first-level substation will also detect the current change and judge the faulty line, and transmit the fault information to the line selection arc suppression device in the station; The substation line selection device will detect changes in the currents of all feeder lines and judge the upper level line fault, and transmit the fault information to the line selection arc suppression device in the station. After summarizing the first-level substation line selection device and the second-level substation line selection device, the line selection arc suppression device in the station determines the fault feeder, and at the same time sends the information to the arc suppression device outside the station, and the arc suppression device outside the station passes through the second controller Ground the faulty phase of the second split-phase fast switch.

At this time, after the phases of the faulty grounding point are grounded through the first split-phase fast switch and the second phase-split fast switch, the voltage on the faulty phase is basically reduced to zero, which can protect personal safety.

The content not described in detail in this specification belongs to the prior art known to those skilled in the art.

Claims (3)

1. A fast switch arc suppression and human body protection system, characterized in that it includes an arc suppression device for line selection in the station, and the arc suppression device for line selection in the station communicates with the arc suppression device outside the station and the line selection of the first-level substation respectively through the communication center module The device is connected to the line selection device of the secondary substation; Among them, the line selection arc suppression device in the station includes a first controller, which is connected to the busbar through a voltage acquisition module to collect the three-phase voltage of the busbar and the zero-sequence voltage of the busbar, and the first controller is also connected to each substation through the current acquisition module connected to each outgoing line so as to collect the zero-sequence current of each outgoing line, and also includes a first split-phase fast switch, the input end of the first split-phase fast switch is connected to the bus in three phases and the output end of the first split-phase fast switch is protected by The module is grounded, and the control end of the first phase-splitting fast switch is connected to the aforementioned first controller; The arc suppression device outside the station includes a second controller, which is connected to the aforementioned first controller, and also includes a second split-phase fast switch, whose input end is connected to the power distribution line three The output terminal of the second phase-splitting fast switch is connected to the ground through the protection module, and the control terminal of the second phase-splitting fast switch is connected to the aforementioned second controller. 2. The fast switch arc suppression and human body protection system according to claim 1, wherein the line selection device of the first-level substation includes a first data processing module, and the first data processing module is connected with the first power supply module, The first display module, the first line selection module are connected to the first communication module, wherein the first line selection module is connected to the zero-sequence current loop of each feeder in the ring network cabinet of the first-level substation, and the first communication module is connected to the first communication module through an optical fiber. a controller connection; Wherein the secondary substation line selection device includes a second data processing module, which is respectively connected with the second power supply module, the second display module, the second line selection module and the second communication module, wherein the second line selection module The module is connected to the zero-sequence current loop of each feeder in the ring network cabinet of the secondary substation, and the second communication module is connected to the first controller through an optical fiber. 3. The fast switch arc suppression and human body protection system according to claim 1, wherein the protection module adopts a lightning arrester.