CN2437038Y

CN2437038Y - Electromagnetic relay

Info

Publication number: CN2437038Y
Application number: CN 00238625
Authority: CN
Inventors: 李润秋
Original assignee: XIQING POWER SUPPLY BRANCH TIANJIN POWER CO
Current assignee: XIQING POWER SUPPLY BRANCH TIANJIN POWER CO
Priority date: 2000-06-23
Filing date: 2000-06-23
Publication date: 2001-06-27
Anticipated expiration: 2010-06-23

Abstract

The utility model discloses a novel electromagnetic relay with an indication loop, which causes a high power resistor and a low-power luminous indicator to be connected in series; one end of the electromagnetic relay with an indication loop is connected with the input end of the relay in parallel, and the other end is connected with the positive pole of a protecting dc power supply. Accordingly, the high power resistor, the luminous indicator, and the coil are caused to be connected in series, and the indication loop is formed. When the relay does not receive operation signals, the indication loop is provided with low current; the luminous indicator can be bright; the coil is indicated to not to have wire break, and the protecting dc power supply is also normal. If the indicator is extinguished, timely maintenance is required. The utility model can visually monitor whether the coil of the relay has the wire break, and reliability of the relay is increased.

Description

The electromagnet relay

The utility model relates to a kind of basic electrical component, specifically is to have the electromagnetic relay of indicating the loop.

Relaying protection is meant when the force device (as generator, circuit etc.) in the system fault has taken place jeopardizes its safe operation, need in time send warning signal, perhaps directly to a kind of automation measure of the circuit breaker generation trip signal of being controlled.With the electric power system is example, and in a single day nature or human failure take place large-scale power system can not in time get rid of the time, will lose stable operation, causes large-area power-cuts.The explanation of many examples, protective relaying device in a single day can not correct operations, often again can the expansion accident, cause serious consequence.Therefore, relay is indispensable important electric component in relaying protection.

The relay functional division can be divided into measuring relay and auxiliary relay; By its textural classification, can be divided into electromagnetic type, induction type, rectification type.The utility model relates generally to electromagnetic relay.

Electromagnetic relay is generally by formations such as electromagnet, mobile armature, coil, contact (normally opened contact, normally-closed contact), antagonistic spring, stops.Its operation principle is: after receiving actuating signal, the magnetic flux that coil is produced during by electric current constitutes the closed-loop path through iron core, air-gap and armature.Armature is magnetized under the effect of electromagnetic field, thereby produces electromagnetic torque, and electromagnetic torque is during greater than antagonistic spring moment and mechanical friction power, and then armature is attracted to electromagnet pole, thereby makes the closing of contact of relay or open.

The coil of relay is in not electriferous state for a long time generally speaking, in case require the actuating of relay, just necessarily requires circuit unimpeded, so reliability is the performance requirement the most basic to relay.But because the line of coil footpath is less, occur broken string sometimes, when actuating signal (curtage) when coming, tripping will appear in relay, often leads to major break down like this.Method to the relay coil check is now, take the 2-3 annual periodicity to measure the method for resistance value, thereby online detection difficulty is very big, so how to find in time whether relay coil is intact, become the difficult problem in the relaying protection work.The purpose of this utility model just provides the electromagnet relay whether a kind of coil of supervisory relay intuitively breaks.

The purpose of this utility model reaches like this:

High power resistance, small-power luminous indication are in series, and one end and relay coil input are in parallel, and the other end links to each other with the positive pole of protection DC power supply, thereby high power resistance, luminous indication, coil are in series, and form the indication loop.When relay is not received actuating signal; be that the normally opened contact of the external various protection components of coil input end is and opens shape, there is voltage at indication two ends, loop, though the faint luminous indication that can make of electric current is bright; show that coil does not well break, the protection DC power supply is also normal.Because electric current is very weak, so the coil both end voltage is very little, deficiency is so that the relay misoperation work.If indicator light has not worked, coil breakage is described or other faults is arranged that the patrolman is once finding and can in time overhauling.

When actuating signal needs relay work; the normally opened contact closure of the various protection components that coil input end is external; direct voltage signal adds the coil two ends, and big electromagnetic torque that electric current produces makes armature movement, thereby the contact of relay is opened or closure.At this moment relay has just entered work loop operate as normal.

The utility model has been owing to adopted such scheme, therefore both intuitively the supervisory relay coil whether break, can also the monitor protection DC power supply whether normal, improved relay reliability, be simple in structure and convenient in use simultaneously.

Below in conjunction with drawings and Examples, further specify the utility model.

Fig. 1 is the utility model indication loop schematic diagram;

Fig. 2 is embodiment 1 an internal terminal wiring schematic diagram;

Fig. 3 is embodiment 2 internal terminal wiring schematic diagrams.

Wherein: the 1st, high power resistance, the 2nd, small-power indicating device, the 3rd, relay coil, the 4th, external normally opened contact, the 5th, positive supply.

Embodiment 1:

Present embodiment is the voltage starting type auxiliary relay, is used for the various protections and the automatic control circuit of dc operation, uses as auxiliary relay, to increase number of contacts and contact capacity.Its structure comprises mobile armature, antagonistic spring contact, stop, and make contact 3 pairs, transfer contact 3 pairs, voltage starting coil (3) etc., the internal terminal winding diagram is as shown in Figure 2.

Choose high power resistance, resistance is 150k Ω, adopt 5 30k Ω high-power resistor series connection in the enforcement, adopt and isolate the method that resistance is handed over, resistor is placed on uses the epoxy resin embedding in the plastic housing, be cast for one, stayed lead-out wire, the small-power luminous indication selects for use light-emitting diode (also can select the 1.5v miniature bulb for use, should adjust the high power resistance during use, the pressure drop of noting bulb side can not be too high, otherwise easily cause the relay misoperation work).High power resistance (1) is with after indicating device (2) is connected, and the one end is connected in terminal and 3. goes up, the positive pole of the 3. external protection DC power supply of terminal, and present embodiment protection direct voltage is 220v; The other end is attempted by the input of voltage starting coil (3) and 6. goes up, and the other end of voltage starting coil (3) passes through terminal , link to each other with the protection dc power cathode.Like this; high power resistance (1), indicating device (2) are in series with coil (3); constitute the indication loop; produce milliampere level (1.4mA) electric current in the indication loop; make indicating device (2) luminous, show not broken string of coil (3), if indicating device (2) has not worked; show that then coil (3) broken string or protection DC power supply break down, and need maintenance to get rid of.

When normally opened contact (4) (see figure 1) of the 6. external various protection components of coil (3) input is closed; mean and receive actuating signal voltage; this moment, direct voltage signal was added in voltage starting coil (3) two ends; armature is moved to make position; the result make transfer contact 7.-9., 10.-the disconnected conversion of closing takes place in , -, make contact 1.-2., 4.-5., 6.-7. closed.During deenergization, armature turns back to reset condition under the pressure effect of contact, and make contact disconnects, the break contact closure.

For preventing that user's mistake from bumping, misconnection protection direct-flow positive pole, on external positive terminal, can add red safety cap or adopt other distinguishing marks.Present embodiment be the base terminal 3. pin put safety cap, amplexiform the line schematic diagram on the chassis.

Embodiment 2:

Present embodiment is voltage starting, electric current maintenance auxiliary relay, is used for the various protections and the automatic control circuit of dc operation, as auxiliary relay, to increase number of contacts and contact capacity.Its structure comprises mobile armature, antagonistic spring contact, stop, 3 of make contact 6 pairs, current protection coils, (3) 1 of voltage starting coils etc.Its internal terminal wiring is seen shown in Figure 3.

Selecting for use of the high power resistance (1) of present embodiment, luminous indication (2) is identical with embodiment 1, and operation principle is also same, and just indicating the loop is 8. to be connected with the protection direct-flow positive pole by terminal.

Equally when normally opened contact (4) (see figure 1) of the 6. external various protection components of voltage starting coil (3) input is closed; direct voltage signal is added in coil (3) two ends; big electric current makes armature motion, utilize mechanism make make contact 1.-2., 7.-10., -, 3.-, 4.-

, 5.-

Closure, the electric current hold-in winding

The cut-in operation loop.When cut-off signal voltage because the existence in electric current hold-in winding winding magnetic field so armature is still closed, has only after electric current keeps the winding outage, armature could be under the pressure of antagonistic spring contact the reinstatement attitude.

8. present embodiment base terminal is the incoming end of direct current protecting positive pole, and same the employing installed red safety cap additional, and sticks wiring schematic diagram on the chassis.

The utility model reliability height, simple in structure, easy to use, market prospects are wide.

Claims

1, a kind of electromagnet relay comprises electromagnet, coil, normally opened contact, mobile armature etc., it is characterized in that incorporating the branch road that is formed by high power resistance and luminous indication series connection at the input of coil, forms the indication loop after this branch road is connected with coil.

2, a kind of electromagnet relay according to claim 1, its feature has the positive source pin terminals on its patchboard.

3, a kind of electromagnet relay according to claim 1 and 2 is characterized in that being cast for one with after several high resistance measurement series connection, and its exit links to each other with luminous indication with the protection dc power anode respectively.