CN2063308U

CN2063308U - Three-phase auto-protector for interruption

Info

Publication number: CN2063308U
Application number: CN 90210087
Authority: CN
Inventors: 孔继武
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-01-20
Filing date: 1990-01-20
Publication date: 1990-10-03

Abstract

The utility model discloses a three-phase auto-protector for interruption. The designing structure of the existing three-phase protectors for interruption is unreasonable, which causes that the performance is unreliable, the phenomenon of phase interruption without power off arises frequently, and the usage is inconvenient. The utility model utilizes three relays which are respectively loaded into three-phase power cords to control the control power sources of electric devices to cause the utility model to accurately cut off the control power sources of electric devices when each phase breaks, and thus the electric devices are protected. The utility model can be used for three-phase networks, the power distribution systems of factories and mines or single electric equipment.

Description

Three-phase auto-protector for interruption

The utility model relates to a kind of three-phase automatic protector that opens circuit, and it is fit to be used in three phase network and factories and miness distribution system or the separate unit power consumption equipment, prevents because the equipment burnout that phase-deficient operation caused.

Domestic existing like product is because project organization is very unreasonable at present; can only use with separate unit motor coupling, and still will by the watt level of motor in addition fine tuning adjust, the back of adjusting is low excessively as electric current; then may cause the protector overcurrent to thread off, stop because of the electric motor starting electric current increases.If instead setting current is high slightly; then can be and protector is not threaded off owing to electrical network or plant area's distribution system phase failure; cause equipment burnout; What is more is that existing three-phase breaker protector all is that safeguard measure is taked in two-phase; and when another opens circuit mutually; protector is inoperative, so existing three-phase breaker protector not only uses extremely inconvenience, and serviceability is extremely unreliable.

The purpose of this utility model is to provide a kind of three-phase broken circuit protecting equipment of new structure, and it can overcome existing deficiency in the prior art, and it is simple in structure, dependable performance, easy to use.

The purpose of this utility model is achieved in that each inserts transformer mutually respectively in proper order in three-phase power line; rectification circuit; filter circuit and dry-reed relay; three transformer iterative earthings; two contacts in three contacts of three dry-reed relays are cascaded; then with another contact access control power supply suitable for reading together, when being used for open phase protection, the transmission of action signal.

The utility model so no matter which opens circuit mutually in the three phase mains, all can make the control dump of power utilization network immediately owing to adopted said structure by relay contact, make equipment avoid phase-deficient operation and burn.Therefore the utility model sensitivity is higher, performance is very reliable.It can be used in electrical network and the distribution system, also can be used in the separate unit electric equipment, need not to consider the power of electric equipment, and the platform number does not need to adjust again before use, so the utility model is easy to use yet.

Below in conjunction with drawings and Examples the utility model is elaborated.

Fig. 1 is the profile front view of a kind of specific embodiment of the utility model.1 is housing among the figure, and shift knob QA, TA are installed on the front plate of housing 1, and the open circuit wiring board of automatic protector of fuse tube, socket, three-phase power input end, control power output terminal and earth terminal, three-phase is installed in the housing 1.

Fig. 2 is the electrical schematic diagram of a kind of instantiation of the utility model.Be connected to transformer B respectively in the three-phase 380V power line ₁, B ₂And B ₃, three transformer iterative earthings after the secondary side of transformer is connected to rectification and filter circuit, are parallel with dry-reed relay KJ ₁～KJ ₃KJ ₂And KJ ₃The series connection of two contacts, with KJ ₁The contact together insert the suitable for reading of power utilization network control power supply Kz.

In order to reduce the temperature rise of transformer, improve useful life, thereby reliability of the present utility model is improved more, can respectively the number of ampere turns of three transformer first and second windings be brought up to the conventional design index 2.5～3.0 times, increased D.C. resistance like this, reduce copper loss, thereby obtain the cold operation of transformer, simultaneously can reduce frequency fluctuation, make the utility model responsive, safe and reliable more.

During work, at first press QA, to the JC energising, its normally opened contact closure, three phase mains is connected, and through transformer transformation and rectification, adjusting after the filtering is that 12～24V direct current is supplied with dry-reed relay KJ ₁～KJ ₃Work makes its normally opened contact closure, as seen from Figure 2 when A mutually or B when opening circuit mutually, the terminal 1 of control power supply Kz cuts off the power supply.When C opens circuit mutually, terminal 2 outages of control power supply Kz.So no matter in the three phase mains which opened circuit mutually, all can in time inerrably cut off control power supply Kz, and power consumption equipment or supply network are protected.

Claims

1, a kind of three-phase automatic protector that opens circuit; it comprises housing and is installed on the interior wiring board of housing; it is characterized in that: the line construction that is adopted is to insert transformer in the three-phase power line respectively in proper order; rectification circuit; filter circuit and dry-reed relay; three transformer iterative earthings, two series connection in the contact of three dry-reed relays are with another contact access control power supply suitable for reading together.

2, according to the said three-phase of claim 1 automatic protector that opens circuit, it is characterized in that: first and second winding number of ampere turns of transformer is brought up to 2.5～3.0 times of conventional design number of ampere turns respectively.