CN205070432U

CN205070432U - Active filter of multiple protection

Info

Publication number: CN205070432U
Application number: CN201520849359.6U
Authority: CN
Inventors: 朱宇
Original assignee: Shaffnar (zhejiang) Electric Co Ltd
Current assignee: Shaffnar (zhejiang) Electric Co Ltd
Priority date: 2015-10-29
Filing date: 2015-10-29
Publication date: 2016-03-02
Anticipated expiration: 2025-10-29

Abstract

The utility model discloses an active filter of multiple protection, including three -phase four -wire power cord, main circuit, main drive circuit, electric current tracking control circuit, instruction arithmetic circuit, three -phase four -wire power cord, main circuit, main electromagnetic drive circuit, electric current tracking control circuit, instruction arithmetic circuit are established ties in proper order, three -phase four -wire power cord and main circuit between be coupled first electric switch then, first electric coil then is connected with leakage detection control circuit for control first electric switch motion then. The utility model discloses reliable earth leakage protection, job stabilization, the earth leakage protection action is rapidly.

Description

The active filter of multiple protective

Technical field

The utility model relates to a kind of active electric filter device, and more particularly, it relates to a kind of active filter of multiple protective.

Background technology

In practical application, eliminate electric power system harmonic wave and mainly take two kinds of filtering methods: passive LC filter and Active Power Filter-APF filtering.

Active Power Filter-APF (ActivePowerFilter, be called for short APF), namely utilize controlled power semiconductor to inject the electric current equal with harmonic source current amplitude, phase place is contrary to electrical network, make total harmonic current of power supply be zero, to reach the object of real-Time Compensation harmonic current.It has following characteristics compared with passive filter:

(1) can not only each harmonic be compensated, also can suppress flickering, compensating reactive power, have the feature of one-machine-multi-function, comparatively reasonable in cost performance;

(2) filtering characteristic is not by the impact of system impedance etc., can eliminate the danger with system impedance generation resonance;

(3) there is controling parameters self-adjusting function, can automatic tracking and compensating change harmonic wave, namely there is the feature such as high controllability and fast-response.

Before this; domestic also have a lot of research to active power filter: such as; coupling transformer type Series active power filter; the Shunt Active Power Filter also had; active filter be connected in electrical network for can exist in connection procedure or running electric leakage and electrocution conditions can not protect active filter reliably comprehensively; the fault of equipment and the reduction in useful life can be caused, and threaten the safety of maintenance personal, therefore safeguard protection aspect be had much room for improvement.

Utility model content

For the deficiency that prior art exists, the purpose of this utility model is to provide one to have reliable earth leakage protective, working stability, the active filter of the multiple protective that earth leakage protective is swift in motion.

For achieving the above object, the utility model provides following technical scheme: a kind of active filter of multiple protective, comprise the three-phase four-wire power line of connecting successively, main circuit, main drive circuit, current follow-up control circuit, ordering calculation circuit, it is characterized in that: between described three-phase four-wire power line and main circuit, be coupled with the first relay, the coil of the first relay is connected with electricity leakage detection control circuit, whether electricity leakage detection control circuit leaks electricity for detecting three-phase four-wire power line and exports control signal to the first relay, described first relay accepts control signal and controls the switch motion of the first relay, three-phase four-wire power line is disconnected.

Preferably, described three-phase four-wire power line is provided with current sensor, and described current sensor is for detecting the electric current of three-phase four-wire power line and output detection signal; Described current sensor is connected with circuit driven by electromagnetic means, and described circuit driven by electromagnetic means accepts detection signal and output drive signal; Described circuit driven by electromagnetic means is connected with electromagnetic lock, and described electromagnetic lock accepts drive singal and automatic locking.

Preferably, described electromagnetic lock is arranged on cabinet door, automatically closes cabinet door by closed for electromagnetic lock when electric leakage being detected.

Preferably, described circuit driven by electromagnetic means comprises comparator, photoelectric coupled circuit, and the inverting input input reference voltage of described comparator, in-phase input end is connected with current sensor, and output is connected with photoelectric coupled circuit, improves driving force by photoelectric coupled circuit.

Preferably, the inverting input of described comparison circuit is connected with slide rheostat, in order to regulate reference voltage.

Compared with prior art, the beneficial effects of the utility model are: by three-phase four-wire power line, main circuit, circuit driven by electromagnetic means, current follow-up control circuit, ordering calculation circuit is connected successively, form the circuit of efficient active filter, realize filter function, but there are some potential safety hazards in connection procedure, the first relay switch is coupled between three-phase four-wire power line and main circuit, first relay coil is connected with electricity leakage detection control circuit, for controlling the first relay switch action, the situation generation of three-phase four-wire power line with or without electric leakage is detected by electricity leakage detection control circuit, the first relay is controlled reliably by electricity leakage detection control circuit, make it possible to the connection cutting off three-phase four-wire power line and active filter, thus proterctive equipment.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the active filter of the utility model multiple protective;

Fig. 2 is the detailed schematic circuit diagram of Fig. 1;

Fig. 3 is the circuit diagram of electricity leakage detection control circuit;

Fig. 4 is the circuit diagram of circuit driven by electromagnetic means.

In figure 1, three-phase four-wire power line; 2, main circuit; 3, main drive circuit; 4, current follow-up control circuit; 5, ordering calculation circuit; 6, the first relay switch; 7, the first relay coil; 8, electricity leakage detection control circuit; 9, current sensor; 10, circuit driven by electromagnetic means; 11, electromagnetic lock; 12, comparator; 13, photoelectric coupled circuit; 14, benchmark voltage; 15, slide rheostat; 16, high-pass filtering circuit.

Embodiment

Referring to figs. 1 through Fig. 4, the active filter embodiment of the utility model multiple protective is described further.

As shown in Figure 1, a kind of active filter of multiple protective, comprise three-phase four-wire power line 1, main circuit 2, main drive circuit 3, current follow-up control circuit 4, ordering calculation circuit 5, described three-phase four-wire power line 1, main circuit 2, main drive circuit 3, current follow-up control circuit 4, ordering calculation circuit 5 is connected successively, this circuit is the circuit theory connection layout of existing techniques in realizing active power filtering function, as shown in Figure 2, circuit realiration filter function is mainly by electric current that the three phase full bridge inversion generation in main circuit 2 and mains by harmonics offset, thus reach the effect of filtering, existing technology is fully open, the filter function realizing main electrical network is common prior art, but, owing to having the potential safety hazard of electric leakage electric shock after terminals wiring, the first relay switch 6 is coupled with between described three-phase four-wire power line 1 and main circuit 2, first relay coil 7 is connected with electricity leakage detection control circuit 8, for controlling the first relay switch 6 action.

The first relay switch 6 is coupled between three-phase four-wire power line 1 and main circuit 2; first relay coil 7 is connected with electricity leakage detection control circuit 8; for controlling the first relay switch 6 action; the situation generation of three-phase four-wire power line 1 with or without electric leakage is detected by electricity leakage detection control circuit 8; the first relay is controlled reliably by electricity leakage detection control circuit 8; make it possible to the connection cutting off three-phase four-wire power line 1 and active filter, thus proterctive equipment.

As shown in Figure 3, first relay coil 7 is mainly through the control circui of Fig. 3, IC in figure adopts integrated circuit M54122L, formed earth leakage circuit-breaker, during to electric leakage and electrocution conditions, wire Le through three phase mains will be charged, thus electric leakage signal is passed to integrated circuit (IC), integrated circuit can produce high level from 7 pin and trigger controllable silicon SCR 1, second relay coil J2 conducting, thus the switch J2-1 of the second relay is disconnected, make, first relay J 1 disconnects with earth terminal, thus make the first relay coil J1 power-off, the switch J1-1 of the first relay disconnects, thus cut off the electricity supply, realize protection.It should be noted that the first relay J 1-1 is the relay of normally-closed contact, power-on switch closes, and the second relay J 2-1 is the relay of normally opened contact, energising, and switch disconnects.When not having drain conditions to occur, do not produce alternating voltage at wire Le.Be in the normal state, first relay J 1-1 keep original state close, the second relay J 2-1 because of controllable silicon SCR 1 cannot conducting and must not electricity, therefore three phase mains connect, circuit working is normal.Overvoltage protection is made up of RU1, RU2, D1.The overvoltage that piezo-resistance Ru1 causes for absorbing thunder and lightning or center line fault etc.

Three-phase four-wire power line 1 is provided with current sensor 9, and current sensor 9 detects three-phase four-wire power line 1 leakage current, and current sensor 9 is connected with circuit driven by electromagnetic means 10, and described circuit driven by electromagnetic means 10 is connected with electromagnetic lock 11.

There is the output of leakage current by checkout equipment, if produce leakage current, then drive electromagnetic lock 11 to close by circuit driven by electromagnetic means 10.Electromagnetic lock 11 is arranged on the cabinet door of the active filter of multiple protective, automatically closes cabinet door by closed for electromagnetic lock 11 when detecting electric leakage.Like this, when there being leakage current, can prevent staff from opening cabinet door; prevent the generation of getting an electric shock, after can preventing three phase mains from closing simultaneously, the existence of residual voltage; the cabinet door of what staff was too early open equipment, so arranges, can play the safety of protection staff.

As shown in Figure 4, circuit driven by electromagnetic means 10 comprises a comparison circuit, optocoupler circuit driven by electromagnetic means 10, the inverting input input benchmark voltage 14 of described comparison circuit.Comparator 12 by the size between benchmark voltage 14 and current sensor 9, thus controls the conducting of triode T, controls turning on and off of electromagnetic lock 11 by photoelectric coupled circuit 13.Optocoupler plays the effect of isolation load and current sensor 9.

Preferably, the inverting input of described comparison circuit is connected with slide rheostat 15, in order to regulate reference voltage.By regulating the resistance of slide rheostat 15 thus changing the comparative voltage of comparator 12, the sensitivity of electromagnetic lock 11 and the current class of electromagnetic lock 11 action can be regulated.Such as when detecting power source change, can suitably regulate slide rheostat 15, proper circuit still can use.

The above is only preferred implementation of the present utility model, protection range of the present utility model be not only confined to above-described embodiment, and all technical schemes belonged under the utility model thinking all belong to protection range of the present utility model.It should be pointed out that for those skilled in the art, do not departing from the some improvements and modifications under the utility model principle prerequisite, these improvements and modifications also should be considered as protection range of the present utility model.

Claims

1. the active filter of a multiple protective, comprise the three-phase four-wire power line of connecting successively, main circuit, main drive circuit, current follow-up control circuit, ordering calculation circuit, it is characterized in that: between described three-phase four-wire power line and main circuit, be coupled with the first relay, the coil of the first relay is connected with electricity leakage detection control circuit, whether electricity leakage detection control circuit leaks electricity for detecting three-phase four-wire power line and exports control signal to the first relay, described first relay accepts control signal and controls the switch motion of the first relay, three-phase four-wire power line is disconnected.

2. the active filter of multiple protective according to claim 1, is characterized in that: described three-phase four-wire power line is provided with current sensor, and described current sensor is for detecting the electric current of three-phase four-wire power line and output detection signal; Described current sensor is connected with circuit driven by electromagnetic means, and described circuit driven by electromagnetic means accepts detection signal and output drive signal; Described circuit driven by electromagnetic means is connected with electromagnetic lock, and described electromagnetic lock accepts drive singal and automatic locking.

3. the active filter of multiple protective according to claim 2, is characterized in that: described electromagnetic lock is arranged on cabinet door, automatically closes cabinet door by closed for electromagnetic lock when electric leakage being detected.

4. the active filter of multiple protective according to claim 3; it is characterized in that: described circuit driven by electromagnetic means comprises comparator, photoelectric coupled circuit; the inverting input input reference voltage of described comparator; in-phase input end is connected with current sensor; output is connected with photoelectric coupled circuit, and described photoelectric coupled circuit is in order to improve the driving force of electromagnetic lock.

5. the active filter of multiple protective according to claim 3, is characterized in that: the inverting input of described comparison circuit is connected with slide rheostat, in order to regulate reference voltage.