CN212849860U

CN212849860U - Arc and resonance elimination cabinet

Info

Publication number: CN212849860U
Application number: CN202021212592.0U
Authority: CN
Inventors: 胡江峰
Original assignee: Suzhou Yima Energy Technology Co ltd
Current assignee: Suzhou Yima Energy Technology Co ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2021-03-30
Anticipated expiration: 2030-06-28

Abstract

The utility model discloses an arc extinction harmonic elimination cabinet, including the cabinet body, its characterized in that: the utility model discloses a high-voltage current-limiting fuse, including cabinet body, ammeter, observation window bottom, electromagnetic lock one side, operating device top, auxiliary switch, the light is installed to cabinet body bottom, the internal portion of cabinet is equipped with the insulator, realizes having very high price/performance ratio to the on-line monitoring of high-voltage current-limiting fuse, can replace arc suppression coil and corollary equipment, voltage transformer cabinet and overvoltage protection device, practices thrift on-the-spot installation space.

Description

Arc and resonance elimination cabinet

Technical Field

The utility model relates to an arc extinction harmonic elimination technical field, in particular to arc extinction harmonic elimination cabinet.

Background

Many power system operation experiences show that in a 3-35 kV neutral point ungrounded system, the development process of a single-phase grounding fault is generally as follows: intermittent arc grounding, stable arc grounding and metal grounding. The overvoltage is the most serious when intermittent arc light is grounded, and the overvoltage of a non-fault phase can reach 3.15-3.5 times or even higher than that of a normal operation phase voltage. Such high overvoltage acts on the electric network for a long time, will cause the insulating accumulative damage of electrical equipment and system, form insulating weak point, and then to ground breakdown and finally lead to alternate short circuit accident, but also can cause the insulating breakdown of electrical equipment (especially the insulation breakdown of motor), the cable phenomenon of blasting, voltage transformer supersaturation excites ferromagnetic resonance easily, lead to PT to burn out, when overvoltage energy surpasses the energy that the arrester can bear, will cause the arrester to explode.

Therefore, it is necessary to provide an arc and resonance elimination cabinet to solve the above problems.

Disclosure of Invention

An object of the utility model is to provide an arc extinction harmonic elimination cabinet to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides an arc extinction harmonic elimination cabinet, includes the cabinet body, its characterized in that: the intelligent cabinet is characterized in that a live display is arranged at the top end of the cabinet body, an ammeter is mounted on one side of the live display, a voltmeter is arranged on one side of the ammeter, an arc and harmonic elimination controller is arranged at the bottom end of the ammeter, a voltage conversion switch is mounted on one side of the arc and harmonic elimination controller, a simulation board is mounted in the middle of the cabinet body, an observation window is arranged at the bottom end of the simulation board, an electromagnetic lock is arranged on one side of the observation window, a nameplate is arranged at the bottom end of the observation window, an operating mechanism is arranged on one side of the electromagnetic lock, an auxiliary switch is arranged at the top end of the operating mechanism, a lighting lamp is mounted at the bottom end of the cabinet body, an insulator is arranged inside the cabinet body, the insulator is in linear connection with a disconnecting link, a high-voltage current limiting fuse is mounted on, one side of the bottom end in the cabinet body is provided with a ground row hole, and the ground row hole is linearly connected with a voltage transformer.

Preferably, the voltage transformer is linearly connected with a PT small fuse.

Preferably, the voltage transformer is used for providing a voltage signal for the cabinet body.

Preferably, the vacuum contactor is used for completing a closing action immediately after receiving an action command of the arc and resonance extinction controller.

Preferably, the overvoltage protection device is used to limit various overvoltages to the ground and between phases to a level that is permitted by the insulation of the equipment.

The utility model discloses a technological effect and advantage:

the utility model discloses a be provided with electrified display, arc extinction harmonic elimination controller, ampere meter, voltmeter, voltage transfer switch, observation window, auxiliary switch, electromagnetic lock, operating device, data plate, analog board, light, insulator, switch, PT small fuse, voltage transformer, ground row's hole, striking mechanism, high-pressure current-limiting fuse, vacuum contactor and overvoltage protection ware, realize the on-line monitoring to high-pressure current-limiting fuse, have very high price/performance ratio, can replace arc suppression coil and corollary equipment, voltage transformer cabinet and overvoltage protection device, practice thrift on-the-spot installation space; the device has the advantages of fast action time, instant extinguishing of electric arc of a fault point after action, complete elimination of arc light grounding overvoltage, effective limitation of arc light grounding overvoltage within √ 3 times phase voltage, capability of allowing a system to continuously operate for more than 2 hours after the device acts, capability of processing a fault line after completing switching operation of load transfer by a user, capability of rapidly and accurately finding out a single-phase grounding fault line, important significance in preventing further expansion of accidents and lightening the workload of operation and maintenance personnel, and adoption of the most advanced 32-bit Microprocessor (MCU) in the core part of the device, and high integration level, strong anti-interference capability, fast operation speed, low power consumption and the like.

The utility model discloses a technological effect and advantage:

Drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is a left side view of the present invention.

Fig. 3 is a schematic view of the current loop of the present invention.

Fig. 4 is a schematic diagram of the voltage circuit of the present invention.

Fig. 5 is a schematic diagram of the control power supply of the present invention.

Fig. 6 is a schematic view of the ac small bus of the present invention.

Fig. 7 is a schematic diagram of the switching value of the present invention.

Fig. 8 is a schematic diagram of a signal circuit according to the present invention.

Fig. 9 is a schematic diagram of the present invention.

In the figure: the device comprises a live display 1, an arc extinction and resonance elimination controller 2, an ammeter 3, a voltmeter 4, a voltage change-over switch 6, an observation window 7, an auxiliary switch 8, an electromagnetic lock 9, an operating mechanism 10, a nameplate 11, a simulation plate 12, an illuminating lamp 13, an insulator 14, a knife switch 15, a small fuse wire 16PT, a voltage transformer 17, a ground hole 18, an impact mechanism 19, a high-voltage current-limiting fuse 20, a vacuum contactor 21 and an overvoltage protector 22.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides an arc extinction harmonic elimination cabinet as shown in the figure, including the cabinet body, its characterized in that: the intelligent cabinet is characterized in that an electrified display 1 is arranged at the top end of the cabinet body, an ammeter 3 is installed on one side of the electrified display 1, a voltmeter 4 is arranged on one side of the ammeter 3, an arc extinction and resonance elimination controller 2 is arranged at the bottom end of the ammeter 3, a voltage conversion switch 6 is installed on one side of the arc extinction and resonance elimination controller 2, a simulation board 12 is installed in the middle of the cabinet body, an observation window 7 is arranged at the bottom end of the simulation board 12, an electromagnetic lock 9 is arranged on one side of the observation window 7, a nameplate 11 is arranged at the bottom end of the observation window 7, an operating mechanism 10 is arranged on one side of the electromagnetic lock 9, an auxiliary switch 8 is arranged at the top end of the operating mechanism 10, a lighting lamp 13 is installed at the bottom end of the cabinet body, an insulator 14 is arranged inside the cabinet body, the insulator 14 is linearly connected with, the utility model discloses a cabinet, including cabinet 1, high-voltage current-limiting fuse 20, vacuum contactor 21, overvoltage protector 22, cabinet internal portion bottom one side is equipped with ground hole 18, ground hole 18 linear connection voltage transformer 17, arc extinction harmonic elimination controller 2 judges according to the signal that voltage transformer 17 provided the fault classification and the looks of cabinet 1 send fault signal to the host computer, when taking place arc light ground connection, immediately to vacuum contactor 21 sends the action command, cuts off vacuum contactor 21.

Further, in the above technical solution, the voltage transformer 17 is linearly connected with the PT small fuse 16;

further, in the above technical solution, the voltage transformer 17 is configured to provide a voltage signal for the cabinet 1;

further, in the above technical solution, the vacuum contactor 21 is configured to complete a closing operation immediately after receiving an operation command of the arc and resonance extinction controller 2;

further, in the above technical solution, the overvoltage protector 22 is used to limit various overvoltages between the phase and the phase to the level allowed by the equipment insulation.

It should be noted that: when a system normally operates, a voltage transformer (connected with system voltage in real time) detects that voltage three phases are in a balanced state and are in a normal operation voltage of 57.7V, when a certain phase voltage is abnormal, an abnormal voltage amplitude value is detected through the voltage transformer, an arc extinction controller CPU judges that the phenomenon is a fault such as arc grounding, metal grounding or ferromagnetic resonance, a controller gives a fault display alarm to remind maintenance personnel to remove the fault according to the fault display, and when the system normally operates, the device normally operates, and at the moment, the device displays the normal voltage of the system. Whether the system has a fault or not is judged by collecting the open-circuit voltage and the three-phase voltage of the system by the device. When the U delta changes from a low potential to a high potential, the system is indicated to be in fault. At the moment, the microcomputer controller ZK is started immediately, and meanwhile, the fault type and the phase difference are judged according to the change of the PT secondary output signal Ua.Ub.Uc. If the A phase generates arc grounding, the A phase vacuum contactor is commanded to be switched on to the ground, the arc grounding is converted into metallic grounding, and the A phase arc is eliminated; B. and C, analogizing. If the system is single-phase PT line fault, the panel of the device displays the fault phase, fault property (PT disconnection) and system voltage in fault, and outputs passive contact signal. If the system is PT resonance fault, the panel of the device displays resonance frequency and opening voltage amplitude and outputs passive contact signals. If the system is a single-phase metal earth fault, the device panel displays the fault phase, the fault nature (metal earth) and the system voltage during the fault. And the vacuum contactor can be automatically opened after the device is operated according to the requirements of users, and the time can be set to be automatically reset once according to the requirements of the users. If the current is an instantaneous ground fault, the system is recovered to be normal; if the fault is a permanent ground fault, the vacuum contactor is not opened after the device acts again; when the basic functions of the device normally run, the device bears the functions of a PT cabinet; when the system has a single-phase arc ground fault, the device converts the arc ground to metallic ground within two cycles and reduces the arc current to zero, thereby extinguishing the arc. At this time, the microcomputer controller panel displays fault type, phase, action time, earth capacitance current and the like, simultaneously outputs passive contact signals, and limits overvoltage in the system within √ 3 times of phase voltage, thereby effectively avoiding accidents such as interphase short circuit, lightning arrester explosion, cable blasting and the like caused by the fault, and preventing the development of intermittent arc grounding fault as much as possible. When metallic grounding occurs, the microcomputer controller gives an alarm, and at the moment, a microcomputer controller (ZK) display screen displays a metal grounding fault, a three-phase voltage value, an open voltage value and a device non-action (the function can set the action according to the requirement of a user) and provides grounding alarm output. When the PT single-phase wire break occurs, the display screen of the microcomputer controller can display the PT wire break fault, the three-phase voltage value and the opening voltage value and provide an alarm signal at the same time. When the voltage transformer generates ferromagnetic resonance, the display screen of the microcomputer controller can display the resonance frequency, the harmonic amplitude value and the alarm time of the system and provide an alarm signal. Meanwhile, the microcomputer controller starts a full-frequency microcomputer harmonic elimination function to protect the voltage transformer. Meanwhile, the device also has the fault processing functions of system low-voltage fault alarm, system overvoltage fault alarm, system resonance fault action and the like, and the accident analysis and information recording functions of time, fault property, fault phase, three-phase voltage, open circuit voltage, ground capacitance current recording and the like during action. The microcomputer controller of the device can be connected with an electrical monitoring system by using CANBUS and RS485 communication interfaces to realize remote signaling, remote measurement, remote control and remote setting functions, and a national standard communication protocol is adopted to ensure that the device is compatible with the whole monitoring system;

1-4ZK is miniature circuit breaker, model: DZ 471P C106A;

5ZK is miniature circuit breaker, model: NB1Z-2P C1016A;

6ZK is miniature circuit breaker, model: DZ 472P C106A

Ka, Kb and Kc are travel switches, and the types are as follows: LX19K-5A 220 VDC;

ja, Jb, Jc are high voltage vacuum contactors, model: JCZJ 1-12/D630-6.3T;

ZK is arc extinction harmonic elimination controller, the model: YM-M210;

GF is isolation sword auxiliary switch, the model: f1-10;

DS is electromagnetic lock, model: DSN-BMZ;

CM is light, model: CM-1

LH is a zero sequence current transformer, and the model is as follows: LMZJ 1-0.5;

PT is voltage transformer, model: JDZJ-10.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims

1. The utility model provides an arc extinction harmonic elimination cabinet, includes the cabinet body, its characterized in that: the intelligent cabinet is characterized in that a live display is arranged at the top end of the cabinet body, an ammeter is mounted on one side of the live display, a voltmeter is arranged on one side of the ammeter, an arc and harmonic elimination controller is arranged at the bottom end of the ammeter, a voltage conversion switch is mounted on one side of the arc and harmonic elimination controller, a simulation board is mounted in the middle of the cabinet body, an observation window is arranged at the bottom end of the simulation board, an electromagnetic lock is arranged on one side of the observation window, a nameplate is arranged at the bottom end of the observation window, an operating mechanism is arranged on one side of the electromagnetic lock, an auxiliary switch is arranged at the top end of the operating mechanism, a lighting lamp is mounted at the bottom end of the cabinet body, an insulator is arranged inside the cabinet body, the insulator is in linear connection with a disconnecting link, a high-voltage current limiting fuse is mounted on, one side of the bottom end in the cabinet body is provided with a ground row hole, and the ground row hole is linearly connected with a voltage transformer.

2. An arc and resonance extinction cabinet according to claim 1, characterized in that: and the voltage transformer is linearly connected with the PT small fuse.

3. An arc and resonance extinction cabinet according to claim 1, characterized in that: the voltage transformer is used for providing voltage signals for the cabinet body.

4. An arc and resonance extinction cabinet according to claim 1, characterized in that: the overvoltage protection device is used for limiting overvoltage between a relative ground and a phase to a level allowed by equipment insulation.