CN202710679U - Testing system for life of electromagnetic relay coil - Google Patents

Abstract

The utility model discloses a testing system for life of an electromagnetic relay coil. Through cooperative control of a voltage-stabilized source, a timing switch, and an alternate ageing oven, accelerated aging tests are respectively performed on a plurality of groups of relays. Then coil aging sensitive parameters, such as average temperature of a coil enameled wire, coil direct current resistance, and coil insulation resistance, are obtained by a thermocouple temperature sensor, a resistance measuring instrument, and a insulation resistance tester. Average operating time of a plurality of groups of tests is calculated by using a reliability theory. Activation energy of the coil enameled wire is calculated by using a least square method, thereby determining parameters in a life evaluation model. The life evaluation model with determined parameters can perform evaluation of average operating time of the relay coils or life evaluation.

Description

The electromagnetic relay coil service life experiment system

Technical field

The utility model relates to the electromagnetic relay coil service life experiment system, also relates to the electromagnetic relay coil lifetime estimation method.

Background technology

Electromagnetic relay is a kind of variation when input quantity (energizing quantity) when reaching regulation and requiring, and makes controlled volume that the electrical equipment that predetermined step changes occurs in electric output circuit, generally is comprised of iron core, coil, armature, contact reed etc.In use can there be aging degradation in electromagnetic relay, mainly is divided into wearing out of contact and wearing out of coil.The aging of contact mainly is because in long-term use procedure, contact surface can generate all kinds of superficial films, thereby affects contact performance, and wherein the carbonization zone of contact surface deposition is the most outstanding on its impact.Coil aging is because relay is under rated voltage (electric current) excited state continuously for a long time, will cause that the weak insulating point of coil (insulation air gap etc.) locates temperature rise, thereby the aging degradation of the enameled wire that causes causes the coil insulation grade to descend.

Because it is very extensive that relay is used in each field, its reliability has been subject to extensive concern, and therefore, the test of relay and electrical endurance test are the key areas of domestic and international electric academia research always.At present the test of electromagnetic relay there have been a lot of methods or equipment, such as relay synthetic test macro (can measure various electrical quantitys) etc., but electrical endurance test is substantially all carried out for relay contact, not yet sees the research to the durability test aspect of relay coil.

Summary of the invention

The method that the purpose of this utility model provides the electromagnetic relay coil service life experiment system and comes based on the measurement data of this pilot system the life-span of electromagnetic relay coil is assessed.

For achieving the above object, the utility model has adopted following technical scheme: a kind of electromagnetic relay coil service life experiment system comprises

Can be the stabilized voltage supply of the relay of a plurality of parallel connections power supply;

Can cut off at setting-up time the time switch of described stabilized voltage supply power supply;

Can hold described a plurality of parallel connections relay and can be according to the alternation ageing oven of test temperature in the time control box;

Can measure the thermocouple temperature sensor of the coil varnish envelope curve temperature of described relay;

Can measure the resistance measuring instrument of the coil direct current resistance of described relay;

Can measure the Insulation Resistance Tester of the coil insulation resistance of described relay;

Can gather, store and export the data collector of the data of the data of described coil varnish envelope curve temperature, described coil direct current resistance and described coil insulation resistance.

Assess the method in the life-span of relay with above-mentioned electromagnetic relay coil service life experiment system, comprise

(1) powers to the relay group in described alternation ageing oven by described stabilized voltage supply, and cut off the power supply of described stabilized voltage supply at setting-up time by described time switch, realize the alternate cycles that high temperature is charged, low temperature the cuts off the power supply operation of pilot relay group, implement accelerated aging test, the relay group has three groups, the relay that a plurality of parallel connections are arranged in every group relay, the test temperature of three group relay groups is different, need to carry out respectively accelerated aging test;

(2) under corresponding test temperature, obtain every group relay group in each circular flow cycle in the data of the coil varnish envelope curve medial temperature of synchronization, and the data of coil direct current resistance and coil insulation resistance, comparison according to the data of the coil direct current resistance in a plurality of circular flow cycle and coil insulation resistance, the degree that reflects the insulation degradation that the coil of relay group occurs, employing is assessed based on the reliability theory of Weibull distribution and average order computing method, obtain every group relay coil under corresponding test temperature, insulation is downgraded to the required average operating time of preassigned degree;

The life appraisal model of relay coil adopts lnt=lnA+Ea/(RT), wherein t is average operating time, T is coil varnish envelope curve medial temperature, A is undetermined constant, and R is Boltzmann constant, and Ea is the activation energy of coil varnish envelope curve, set y=lnt, x=1/T, a=Ea/R, b=lnA, then obtain y=ax+b, utilize least square method to carry out curve fitting, calculate a and b

$a=\frac{\mathrm{N\Σxy}-\mathrm{\Σx\Σy}}{\mathrm{N\Σ}{x}^2-{\left(\mathrm{\Σx}\right)}^2}$ $b=\frac{\mathrm{\Σy}-\mathrm{a\Σx}}{N}$

Draw Ea and A according to a and b, then can carry out the average operating time of relay coil according to the life appraisal model of described relay coil or be called the assessment in life-span.

During implementation, in step (1), the high temperature of three group relay groups is charged, the alternate cycles operation of low temperature outage refers to:

One group relay group first 100 ℃ of operations 90 hours under the electric condition, then-25 ℃ of operations 10 hours under outage condition, follow-uply repeat to get electric 100 ℃ of 90 hours ,-25 ℃ of such circular flows in 10 hours of outage;

An other group relay group first 110 ℃ of operations 90 hours under the electric condition, then-25 ℃ of operations 10 hours under outage condition, follow-uply repeat to get electric 110 ℃ of 90 hours ,-25 ℃ of such circular flows in 10 hours of outage;

The 3rd group relay first 120 ℃ of operations 90 hours under the electric condition, then-25 ℃ of operations 10 hours under outage condition, follow-uply repeat to get electric 120 ℃ of 90 hours ,-25 ℃ of such circular flows in 10 hours of outage.

Because the utilization of technique scheme, the utility model compared with prior art has following advantages: pass through stabilized voltage supply, the cooperation control of time switch and alternation ageing oven, many group relaies are carried out respectively accelerated aging test, pass through again thermocouple temperature sensor, the coil that resistance measuring instrument and Insulation Resistance Tester the measure sensitive parameter-coil varnish envelope curve medial temperature that wears out, coil direct current resistance and coil insulation resistance, the theoretical average operating time that calculates many group tests of application reliability, utilize least square method to calculate the activation energy of coil varnish envelope curve, thereby determine the parameter in the life appraisal model, the life appraisal model that then determines by parameter can carry out the average operating time of relay coil or be called the assessment in life-span.

Description of drawings

Accompanying drawing 1 is schematic diagram of the present utility model.

Embodiment

Further set forth the utility model below in conjunction with accompanying drawing.

Referring to Fig. 1, a kind of electromagnetic relay coil service life experiment system, comprise stabilized voltage supply 1, time switch 8, alternation ageing oven 9, thermocouple temperature sensor 4, resistance measuring instrument 3, Insulation Resistance Tester 10, data collector 6, stabilized voltage supply 1 is in series with relay 2 and time switch 8, stabilized voltage supply 1 is relay 2 power supplies, here relay 2 is the relay group, comprise a plurality of relays that are in parallel, time switch 8 can cut off at setting-up time the power supply of stabilized voltage supply 1, so that relay 2 is in off-position.In Fig. 1, relay 2 is in the alternation ageing oven 9, and alternation ageing oven 9 can be according to test temperature in the time control box, like this when carrying out relay 2 coil durability test, high temperature that can pilot relay 2 is charged, the alternate cycles operation of low temperature outage, implements accelerated aging test.The coil varnish envelope curve temperature of thermocouple temperature sensor 4 measuring relays 2, the coil direct current resistance of resistance measuring instrument 3 measuring relays 2, the coil insulation resistance of Insulation Resistance Tester 10 measuring relays 2, contact pick-up voltage and the release voltage of multimeter 5 measuring relays 2 among Fig. 1, data collector 6 can gather, the data of storage and output winding enameled wire temperature, the data of the data of coil direct current resistance and coil insulation resistance and contact pick-up voltage and release voltage, the assessment in relay coil life-span here are the data that rely on coil varnish envelope curve temperature, the data of coil direct current resistance and coil insulation resistance are carried out.The aging sensitive parameter data that data collector 6 outputs represent coil realize life appraisal to service life evaluation system 7.

Assess the method in the life-span of relay 2 with above-mentioned electromagnetic relay coil service life experiment system, comprising:

(1) powers to the relay group in alternation ageing oven 9 by stabilized voltage supply 1, and by the power supply of time switch 8 in setting-up time cut-out stabilized voltage supply 1, the high temperature of realizing the pilot relay group is charged, the alternate cycles operation of low temperature outage, implement accelerated aging test, the relay group has three groups, the relay that a plurality of parallel connections are arranged in every group relay group, the test temperature of many group relaies group is different, need to carry out respectively accelerated aging test, in the specific implementation, the high temperature of three group relay groups is charged, the alternate cycles operation of low temperature outage refer to respectively be a group relay first 100 ℃ of operations 90 hours under the electric condition, then under outage condition-25 ℃ the operation 10 hours, follow-up repeat electric 100 ℃ 90 hours,-25 ℃ of such circular flows in 10 hours of cutting off the power supply; An other group relay group first 110 ℃ of operations 90 hours under the electric condition, then-25 ℃ of operations 10 hours under outage condition, follow-uply repeat to get electric 110 ℃ of 90 hours ,-25 ℃ of such circular flows in 10 hours of outage; The 3rd group relay first 120 ℃ of operations 90 hours under the electric condition, then-25 ℃ of operations 10 hours under outage condition, follow-uply repeat to get electric 120 ℃ of 90 hours ,-25 ℃ of such circular flows in 10 hours of outage.Electric, outage is cooperation control by stabilized voltage supply 1, time switch 8, alternation ageing oven 9 can be according to the test temperature in the time control box;

(2) charged at the high temperature of three group relay groups, the alternate cycles of low temperature outage is in service, in each circular flow cycle, obtain every group relay in the data of the coil varnish envelope curve medial temperature of synchronization, and the data of coil direct current resistance and coil insulation resistance, comparison according to the data of the coil direct current resistance in a plurality of circular flow cycle and coil insulation resistance, the degree that reflects the insulation degradation that the coil of relay group occurs, for example, set the coil direct current resistance and reduce the degree that 10% i.e. representative insulation is downgraded to appointment, employing is assessed based on the reliability theory of Weibull distribution and average order computing method, obtain every group relay coil under corresponding test temperature, insulation is downgraded to the required average operating time of preassigned degree, computing method referenced patent open source literature " fuse life characteristic data test and evaluating system and the appraisal procedure thereof " CN101915887 of average operating time, be the calculating of the average operating time of fuse although this patent publication us is disclosed, the calculating of the average operating time of relay coil is identical with it.The coil varnish envelope curve medial temperature that three group relay coils obtain and the test figure of average operating time are as shown in the table:

Test temperature/℃	T 1	T 2	T 3
				Test termination time/h	τ 1	τ 2	τ 3

The life appraisal model of relay coil adopts lnt=lnA+Ea/(RT), wherein t is average operating time, T is coil varnish envelope curve medial temperature, A is undetermined constant, and R is Boltzmann constant, and Ea is the activation energy of coil varnish envelope curve, set y=lnt, x=1/T, a=Ea/R, b=lnA, then obtain y=ax+b, utilize least square method to carry out curve fitting, calculate a and b

$a=\frac{\mathrm{N\Σxy}-\mathrm{\Σx\Σy}}{\mathrm{N\Σ}{x}^2-{\left(\mathrm{\Σx}\right)}^2}$ $b=\frac{\mathrm{\Σy}-\mathrm{a\Σx}}{N}$

Draw Ea and A according to a and b, then can carry out the average operating time of relay coil according to the life appraisal model of relay coil or be called the assessment in life-span.

Claims (1)

1. an electromagnetic relay coil service life experiment system is characterized in that: comprise

Can be the stabilized voltage supply of the relay of a plurality of parallel connections power supply;

Can cut off at setting-up time the time switch of described stabilized voltage supply power supply;

Can hold described a plurality of parallel connections relay and can be according to the alternation ageing oven of test temperature in the time control box;

Can measure the thermocouple temperature sensor of the coil varnish envelope curve temperature of described relay;

Can measure the resistance measuring instrument of the coil direct current resistance of described relay;

Can measure the Insulation Resistance Tester of the coil insulation resistance of described relay;

Can gather, store and export the data collector of the data of the data of described coil varnish envelope curve temperature, described coil direct current resistance and described coil insulation resistance.

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