CN103344913A - Electromagnetic relay testing equipment and method - Google Patents
Electromagnetic relay testing equipment and method Download PDFInfo
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- CN103344913A CN103344913A CN2013103221571A CN201310322157A CN103344913A CN 103344913 A CN103344913 A CN 103344913A CN 2013103221571 A CN2013103221571 A CN 2013103221571A CN 201310322157 A CN201310322157 A CN 201310322157A CN 103344913 A CN103344913 A CN 103344913A
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Abstract
The invention belongs to the technical field of testing electrician devices, and particularly relates to the testing of an electromagnetic relay. Electromagnetic relay testing equipment comprises a power source (6), a bus baseboard (7), an interface (8) and a cable (9) for connecting the interface (8) with a pin of a tested relay (11), and the equipment is characterized by also comprising a high-power direct-current power source (1), a load resistor (2), a main controller (3), a multifunctional board card (4), a signal conditioning board card (5) and a hall sensor (10). The electromagnetic relay testing equipment has the main advantages that 1. during testing, a contact of the tested relay works at rated load current, so that a reliable testing conclusion can be given; 2. transistor devices such as triodes and field-effect tubes are used for controlling the electromagnetic relay to act and switch signals, so that the influence of action delaying on testing results is eliminated, and the service life of the testing equipment is prolonged; 3. the parameter variation of the electrical property of the tested relay can be forecasted so as to provide the basis for application.
Description
Technical field
The invention belongs to the electronic parts technical field of measurement and test, particularly electromagnetic relay test.
Background technology
Electromagnetic relay often need detect its unit for electrical property parameters before coming into operation, and whether satisfies request for utilization to assess it.Conventional detection mainly contains two classes: a class is monitoring one or several parameters, and circulation is repeatedly tested, and the gained result can be used for judging the electric life of electromagnetic relay; Another kind of is that multiple parameters is carried out disposable detection, and the gained result can be used for the performance state of judging that electromagnetic relay is current.
Existing detection method mainly has the following disadvantages: when (one) detects, the load current of electromagnetic relay is generally settings such as 0.5A, 1A, comply with the national standard requirements, but much smaller than the electromagnetic relay nominal load current, can not examine the electrical property of electromagnetic relay under maximum conditions, be unfavorable for estimating its reliability; (2) circuit of detecting instrument self has used relay, has the problem of accuracy of detection aspect, and the relay life-span is limited, is consumable accessory, uses when frequent, needs often to change; (3) testing result only comprises the data that actual detected obtains, and does not do software processing and prediction.
Summary of the invention
The objective of the invention is: provide a kind of and can overcome the above-mentioned deficiency of prior art, electromagnetic relay is carried out the robotization continuous detecting, the Apparatus and method for that its electric life and unit for electrical property parameters thereof are made accurate detection and estimated.
Technical scheme of the present invention is: a kind of electromagnetic relay checkout equipment comprises: power supply, and bus mother board, interface connects the cable of described interface and measured relay pin; It is characterized in that: further comprising: high-power DC power supply, pull-up resistor, master controller, multi-functional integrated circuit board, signal condition integrated circuit board, Hall element;
Described high-power DC power supply is used for providing the measured relay contact to detect required electric current and voltage, Adjustable Output Voltage, and maximum output current is not less than 50A; Its output plus terminal is connected to described measured relay contact common port;
Described pull-up resistor is connected between the output negative terminal of the normally opened contact of described measured relay and described high-power DC power supply; Described pull-up resistor is the resistance wire combination that independent switch is arranged, and can be combined into required resistance value;
Described master controller is the embedded computer that is connected with display screen, keyboard and mouse, and it carries out test procedure, and the control test process is finished record, demonstration, analysis and the storage of test data;
Described multi-functional integrated circuit board is the general controls integrated circuit board that comprises DA output, AD sampling, DI/O and timer circuit; It finishes the conversion to described master controller input/output signal;
The described multi-functional integrated circuit board of described signal regulating panel card connection and described interface are finished the conditioning of signal between described multi-functional integrated circuit board and the described measured relay pin, and it is mated mutually; Described signal condition integrated circuit board comprises the relay coil testing circuit, being input as by described primary controller procedure control of this circuit, variable voltage signal through described multi-functional integrated circuit board output, after this circuit power amplification, be applied to the series circuit that described measured relay coil and sample resistance are formed, also be applied to the bleeder circuit that is composed in series by two resistance simultaneously, reflect that the signal of described measured relay coil pressure drop obtains from described sample resistance and described bleeder circuit mid point; Described signal condition integrated circuit board also comprises the relay contact detection circuit, three tunnel inputs of described relay contact detection circuit are connected on contact common port, normally closed contact and the normally opened contact of described measured relay respectively, described three tunnel inputs are after the photoelectricity coupling is isolated, and described normally closed contact signal and described normally opened contact signal output to described multi-functional integrated circuit board through a sample circuit separately; Described contact common port signal and described normally opened contact signal be respectively through two signal amplifiers, is input to high-precision current detection calculations amplifier and carries out delivering to described multi-functional integrated circuit board as the contact voltage drop signal after difference amplifies; The power supply of described two signal amplifiers is by a power amplifier control, the signal controlling that described power amplifier is sent through described multi-functional integrated circuit board by described master controller, when described tested electromagnetic relay discharges, described power amplifier disconnects the power supply of described two signal amplifiers, protects described current detecting operational amplifier not damage because input exceeds allowed band;
Described Hall element is connected to the electric wire of described pull-up resistor, detected load current signal is converted to voltage signal is sent to described signal condition integrated circuit board.
A kind of electromagnetic relay detection method, it uses electromagnetic relay checkout equipment as mentioned above, and may further comprise the steps:
A. detect actuation time
According to the actuation time of measured relay nominal, dispose count frequency and the mode of operation of described multifunction board card timer by described master controller, make it carry out counting and prepare; Coil rating operating voltage according to the measured relay nominal, by the described relay coil testing circuit of described main controller controls, making the pressure drop on the measured relay coil is rated operational voltage, described master controller writes the counting initial value to the appointment register of described timer simultaneously, makes it begin counting; By the described normally closed contact signal of continuous Query and described normally opened contact signal, Query Value and count value are buffered in the array, all change until described normally closed contact signal and described normally opened contact signal, and keep more than 0.5 millisecond, according to count frequency, count value is scaled time value, is the actuation time of measured relay;
B. detect contact resistance
Coil rating operating voltage according to the measured relay nominal, by the described relay coil testing circuit of described main controller controls, making the pressure drop on the measured relay coil is rated operational voltage, wait for 100 milliseconds, after measured relay is stable, after described normally closed contact signal and described normally opened contact signal all change, confirm measured relay adhesive; The described power amplifier of described main controller controls is given described two signal amplifiers power supply, makes described contact common port signal and described normally opened contact signal enter described current detecting operational amplifier; Described master controller reads the parameter of described Hall element; Conversion obtains the current value by described normally opened contact; Read the output valve of described current detecting operational amplifier, divided by enlargement factor, calculate contact voltage drop, divided by the current value of described normally opened contact, can obtain contact resistance again; Control the power supply that described power amplifier disconnects described two signal amplifiers then;
C. magnetic test coil resistance
Coil rating operating voltage according to the measured relay nominal, by the described relay coil testing circuit of described main controller controls, making the pressure drop on the measured relay coil is rated operational voltage, wait for 100 milliseconds, after measured relay is stable, read the signal of reflection described measured relay coil pressure drop, then according to formula, calculate the coil resistance of measured relay:
The coil resistance of measured relay is:
D. detect release time
According to the release time of measured relay nominal, dispose count frequency and the mode of operation of timer described in the described multi-functional integrated circuit board by described main controller controls, make it carry out counting and prepare; The described relay coil testing circuit of described main controller controls makes the measured relay coil blackout, simultaneously writes the counting initial value by described master controller to the appointment register of described timer, makes it begin counting; By the described normally closed contact signal of continuous Query and described normally opened contact signal, Query Value and count value are buffered in the array, all change until described normally closed contact signal and described normally opened contact signal, and keep more than 0.5 millisecond, according to count frequency, count value is scaled time value, is the release time of measured relay;
E. detect operation voltage
Operation voltage according to the measured relay nominal, by the selected starting potential less than nominal operation voltage minimum value of described master controller, increase step-length and greater than the peaked final voltage of nominal operation voltage, control described relay coil testing circuit, the pressure drop on the measured relay coil is progressively increased by the appointment step-length from starting potential; Simultaneously, the described normally closed contact signal of continuous Query and described normally opened contact signal, when the two all changed, the pressure drop on the measured relay coil was operation voltage; If behind the arrival final voltage, measured relay is not moved yet, judge that then the operation voltage of measured relay is defective;
F. detect release voltage
Release voltage according to the measured relay nominal, by described master controller selected suitable greater than the peaked starting potential of nominal release voltage, reduce step-length and less than the final voltage of nominal release voltage minimum value, control described relay coil testing circuit, the pressure drop on the measured relay coil is progressively reduced by the appointment step-length from starting potential; Simultaneously, the described normally closed contact signal of continuous Query and described normally opened contact signal, when the two all changed, the pressure drop on the measured relay coil was release voltage; If behind the arrival final voltage, measured relay does not discharge yet, judge that then the release voltage of measured relay is defective;
G. automatic cycle detection
According to the detection times N of setting, repeat A～F step N time;
H. life prediction
Contact resistance, coil resistance, actuation time, release time, operation voltage, release voltage data that detection is obtained, adopt polynomial fitting method to handle respectively, obtain each parameter change curve, predict that this parameter exceeds the cycle index of acceptability limit, deduct the cycle index of having carried out, the residual electricity life-span that obtains predicting.
Major advantage of the present invention is: when 1, detecting, the measured relay contact is operated in nominal load current, can provide and detect conclusion more reliably; 2, transistor devices control electromagnetic relays such as use triode or field effect transistor move and carry out signal and switch, and have eliminated the influence of action delay to testing result, the life-span of having improved checkout equipment self; 3, can make prediction to the unit for electrical property parameters variation of measured relay, for use provides foundation.
Description of drawings
Fig. 1 is electromagnetic relay checkout equipment theory diagram of the present invention;
Fig. 2 is electromagnetic relay checkout equipment repeat circuit coil testing circuit schematic diagram of the present invention;
Fig. 3 is electromagnetic relay checkout equipment repeat circuit of the present invention contact testing circuit schematic diagram.
Embodiment
Embodiment 1: referring to accompanying drawing, a kind of electromagnetic relay checkout equipment comprises: power supply 6, and bus mother board 7, interface 8 connects the cable 9 of described interface 8 and measured relay 11 pins; It is characterized in that: further comprising: high-power DC power supply 1, pull-up resistor 2, master controller 3, multi-functional integrated circuit board 4, signal condition integrated circuit board 5, Hall element 10;
Described high-power DC power supply 1 is used for providing measured relay 11 contacts to detect required electric current and voltage, Adjustable Output Voltage, and maximum output current is not less than 50A; Its output plus terminal is connected to described measured relay 11 contact common ports;
Described pull-up resistor 2 is connected between the output negative terminal of the normally opened contact of described measured relay 11 and described high-power DC power supply 1; Described pull-up resistor 2 can be combined into required resistance value for the resistance wire combination of independent switch is arranged;
Described master controller 3 is for being connected with the embedded computer of display screen, keyboard and mouse, and it carries out test procedure, and the control test process is finished record, demonstration, analysis and the storage of test data;
Described multi-functional integrated circuit board 4 is the general controls integrated circuit board that comprises DA output, AD sampling, DI/O and timer circuit; It finishes the conversion to described master controller 3 input/output signals;
Described signal condition integrated circuit board 5 connects described multi-functional integrated circuit board 4 and described interface 8, finishes the conditioning of signal between described multi-functional integrated circuit board 4 and described measured relay 11 pins, and it is mated mutually; Described signal condition integrated circuit board 5 comprises the relay coil testing circuit, being input as by described master controller 3 programmed control of this circuit, through the variable voltage signal DAC0 of described multi-functional integrated circuit board 4 outputs, after this circuit power amplification, be applied to described measured relay 11 coil R
LineWith sample resistance R
SmartThe series circuit of forming also is applied to simultaneously by two resistance R
Divide 1, R
Divide 2The bleeder circuit that is composed in series reflects the signal ADS1 of described measured relay 11 coil pressure drops, and ADS0 is from described sample resistance R
SmartObtain with described bleeder circuit mid point; Described signal condition integrated circuit board 5 also comprises the relay contact detection circuit, three tunnel inputs of described relay contact detection circuit are connected on contact common port, normally closed contact and the normally opened contact of described measured relay 11 respectively, described three tunnel inputs are after the photoelectricity coupling is isolated, described normally closed contact signal and described normally opened contact signal are separately through a sample circuit R6, R7; R4, R5 output to described multi-functional integrated circuit board 4; Described contact common port signal and described normally opened contact signal be respectively through two signal amplifier X8B, and X8C is input to high-precision current detection calculations amplifier MAX4073 and carries out delivering to described multi-functional integrated circuit board 4 as the contact voltage drop signal after difference amplifies; Described two signal amplifier X8B, the power supply of X8C is by a power amplifier X8A, NPN control, described power amplifier X8A, the signal DO0 control that NPN is sent through described multi-functional integrated circuit board 4 by described master controller 3 is when described tested electromagnetic relay discharges, described power amplifier X8A, NPN disconnects described two signal amplifier X8B, and the power supply of X8C protects described current detecting operational amplifier MAX4073 not damage because input exceeds allowed band;
Described Hall element 10 is connected to the electric wire of described pull-up resistor 2, detected load current signal is converted to voltage signal is sent to described signal condition integrated circuit board 5.
Embodiment 2: a kind of electromagnetic relay detection method, and it uses embodiment 1 described electromagnetic relay checkout equipment, and may further comprise the steps:
A. detect actuation time
According to the actuation time of measured relay 11 nominals, count frequency and mode of operation by described multi-functional integrated circuit board 4 timers of described master controller 3 configurations make it carry out counting and prepare; Coil rating operating voltage according to measured relay 11 nominals, by the described relay coil testing circuit of described master controller 3 controls, making the pressure drop on measured relay 11 coils is rated operational voltage, described master controller 3 writes the counting initial value to the appointment register of described timer simultaneously, makes it begin counting; By the described normally closed contact signal of continuous Query and described normally opened contact signal, Query Value and count value are buffered in the array, all change until described normally closed contact signal and described normally opened contact signal, and keep more than 0.5 millisecond, according to count frequency, count value is scaled time value, is the actuation time of measured relay 11;
B. detect contact resistance
Coil rating operating voltage according to measured relay 11 nominals, by the described relay coil testing circuit of described master controller 3 controls, making the pressure drop on measured relay 11 coils is rated operational voltage, wait for 100 milliseconds, after measured relay 11 is stablized, after described normally closed contact signal and described normally opened contact signal all change, confirm measured relay 11 adhesive; The described power amplifier X8A of described master controller 3 controls, NPN gives described two signal amplifier X8B, and the X8C power supply makes described contact common port signal and described normally opened contact signal enter described current detecting operational amplifier MAX4073; Described master controller 3 reads the parameter of described Hall element 10; Conversion obtains the current value by described normally opened contact; Read the output valve of described current detecting operational amplifier MAX4073, divided by enlargement factor, calculate contact voltage drop, divided by the current value of described normally opened contact, can obtain contact resistance again; Control described power amplifier X8A then, NPN disconnects described two signal amplifier X8B, the power supply of X8C;
C. magnetic test coil resistance
Coil rating operating voltage according to measured relay 11 nominals, by the described relay coil testing circuit of described master controller 3 controls, making the pressure drop on measured relay 11 coils is rated operational voltage, wait for 100 milliseconds, after measured relay 11 is stablized, read the signal ADS1 of the described measured relay 11 coil pressure drops of reflection, ADS0 calculates the coil resistance of measured relay 11 then according to formula 1,2:
The coil resistance of measured relay 11 is:
D. detect release time
According to the release time of measured relay 11 nominals, count frequency and mode of operation by timer described in the described multi-functional integrated circuit board 4 of described master controller 3 control configurations make it carry out counting and prepare; The described relay coil testing circuit of described master controller 3 controls makes measured relay 11 coil blackouts, writes the counting initial value by described master controller 3 to the appointment register of described timer simultaneously, makes it begin counting; By the described normally closed contact signal of continuous Query and described normally opened contact signal, Query Value and count value are buffered in the array, all change until described normally closed contact signal and described normally opened contact signal, and keep more than 0.5 millisecond, according to count frequency, count value is scaled time value, is the release time of measured relay 11;
E. detect operation voltage
Operation voltage according to measured relay 11 nominals, by described master controller 3 selected starting potentials less than nominal operation voltage minimum value, increase step-length and greater than the peaked final voltage of nominal operation voltage, control described relay coil testing circuit, the pressure drop on measured relay 11 coils is progressively increased by the appointment step-length from starting potential; Simultaneously, the described normally closed contact signal of continuous Query and described normally opened contact signal, when the two all changed, the pressure drop on measured relay 11 coils was operation voltage; If behind the arrival final voltage, measured relay 11 is not moved yet, judges that then the operation voltage of measured relay 11 is defective;
F. detect release voltage
Release voltage according to measured relay 11 nominals, by described master controller 3 selected suitable greater than the peaked starting potential of nominal release voltage, reduce step-length and less than the final voltage of nominal release voltage minimum value, control described relay coil testing circuit, the pressure drop on measured relay 11 coils is progressively reduced by the appointment step-length from starting potential; Simultaneously, the described normally closed contact signal of continuous Query and described normally opened contact signal, when the two all changed, the pressure drop on measured relay 11 coils was release voltage; If behind the arrival final voltage, measured relay 11 does not discharge yet, judges that then the release voltage of measured relay 11 is defective;
G. automatic cycle detection
According to the detection times N of setting, repeat A～F step N time;
H. life prediction
Contact resistance, coil resistance, actuation time, release time, operation voltage, release voltage data that detection is obtained, adopt polynomial fitting method to handle respectively, obtain each parameter change curve, predict that this parameter exceeds the cycle index of acceptability limit, deduct the cycle index of having carried out, the residual electricity life-span that obtains predicting.
Claims (2)
1. electromagnetic relay checkout equipment comprises: power supply (6), and bus mother board (7), interface (8) connects the cable (9) of described interface (8) and measured relay (11) pin; It is characterized in that: further comprising: high-power DC power supply (1), pull-up resistor (2), master controller (3), multi-functional integrated circuit board (4), signal condition integrated circuit board (5), Hall element (10);
Described high-power DC power supply (1) is used for providing measured relay (11) contact to detect required electric current and voltage, Adjustable Output Voltage, and maximum output current is not less than 50A; Its output plus terminal is connected to described measured relay (11) contact common port;
Described pull-up resistor (2) is connected between the output negative terminal of the normally opened contact of described measured relay (11) and described high-power DC power supply (1); Described pull-up resistor (2) can be combined into required resistance value for the resistance wire combination of independent switch is arranged;
Described master controller (3) is for being connected with the embedded computer of display screen, keyboard and mouse, and it carries out test procedure, and the control test process is finished record, demonstration, analysis and the storage of test data;
Described multi-functional integrated circuit board (4) is the general controls integrated circuit board that comprises DA output, AD sampling, DI/O and timer circuit; It finishes the conversion to described master controller (3) input/output signal;
Described signal condition integrated circuit board (5) connects described multi-functional integrated circuit board (4) and described interface (8), finishes the conditioning of signal between described multi-functional integrated circuit board (4) and described measured relay (11) pin, and it is mated mutually; Described signal condition integrated circuit board (5) comprises the relay coil testing circuit, being input as by described master controller (3) programmed control of this circuit, variable voltage signal (DAC0) through described multi-functional integrated circuit board (4) output, after this circuit power amplification, be applied to described measured relay (11) coil (R
Line) and sample resistance (R
Smart) series circuit formed, also be applied to simultaneously by two resistance (R
Divide 1, R
Divide 2) bleeder circuit that is composed in series, (ADS1 is ADS0) from described sample resistance (R to reflect the signal of described measured relay (11) coil pressure drop
Smart) and described bleeder circuit mid point obtain; Described signal condition integrated circuit board (5) also comprises the relay contact detection circuit, three tunnel inputs of described relay contact detection circuit are connected on contact common port, normally closed contact and the normally opened contact of described measured relay (11) respectively, described three tunnel inputs are after the photoelectricity coupling is isolated, described normally closed contact signal and described normally opened contact signal are separately through sample circuit (R6, a R7; R4 R5) outputs to described multi-functional integrated circuit board (4); Described contact common port signal and described normally opened contact signal are respectively through two signal amplifier (X8B, X8C), being input to high-precision current detection calculations amplifier (MAX4073) carries out delivering to described multi-functional integrated circuit board (4) as the contact voltage drop signal after difference amplifies; Described two signal amplifier (X8B, X8C) power supply is by a power amplifier (X8A, NPN) control, described power amplifier (X8A, NPN) signal (DO0) control of being sent through described multi-functional integrated circuit board (4) by described master controller (3), when described tested electromagnetic relay discharges, described power amplifier (X8A, NPN) disconnect described two signal amplifier (X8B, X8C) power supply protects described current detecting operational amplifier (MAX4073) not damage because input exceeds allowed band;
Described Hall element (10) is connected to the electric wire of described pull-up resistor (2), detected load current signal is converted to voltage signal is sent to described signal condition integrated circuit board (5).
2. electromagnetic relay detection method, it uses electromagnetic relay checkout equipment according to claim 1, and may further comprise the steps:
A. detect actuation time
According to the actuation time of measured relay (11) nominal, by count frequency and the mode of operation of described master controller (3) configuration described multi-functional integrated circuit board (4) timer, make it carry out counting and prepare; Coil rating operating voltage according to measured relay (11) nominal, by the described relay coil testing circuit of described master controller (3) control, making the pressure drop on measured relay (11) coil is rated operational voltage, described master controller (3) writes the counting initial value to the appointment register of described timer simultaneously, makes it begin counting; By the described normally closed contact signal of continuous Query and described normally opened contact signal, Query Value and count value are buffered in the array, all change until described normally closed contact signal and described normally opened contact signal, and keep more than 0.5 millisecond, according to count frequency, count value is scaled time value, is the actuation time of measured relay (11);
B. detect contact resistance
Coil rating operating voltage according to measured relay (11) nominal, by the described relay coil testing circuit of described master controller (3) control, making the pressure drop on measured relay (11) coil is rated operational voltage, wait for 100 milliseconds, after measured relay (11) is stable, after described normally closed contact signal and described normally opened contact signal all change, confirm measured relay (11) adhesive; Described master controller (3) control described power amplifier (X8A, NPN) give described two signal amplifiers (X8B, X8C) power supply makes described contact common port signal and described normally opened contact signal enter described current detecting operational amplifier (MAX4073); Described master controller (3) reads the parameter of described Hall element (10); Conversion obtains the current value by described normally opened contact; Read the output valve of described current detecting operational amplifier (MAX4073), divided by enlargement factor, calculate contact voltage drop, divided by the current value of described normally opened contact, can obtain contact resistance again; (X8A NPN) disconnects described two signal amplifiers (X8B, power supply X8C) to control described power amplifier then;
C. magnetic test coil resistance
Coil rating operating voltage according to measured relay (11) nominal, by the described relay coil testing circuit of described master controller (3) control, making the pressure drop on measured relay (11) coil is rated operational voltage, wait for 100 milliseconds, after measured relay (11) is stable, read reflection described measured relay (11) coil pressure drop signal (ADS1 ADS0), calculates the coil resistance of measured relay (11) then according to formula (1), (2):
The coil resistance of measured relay (11) is:
D. detect release time
According to the release time of measured relay (11) nominal, by count frequency and the mode of operation of timer described in described master controller (3) the control described multi-functional integrated circuit board of configuration (4), make it carry out counting and prepare; The described relay coil testing circuit of described master controller (3) control makes measured relay (11) coil blackout, writes the counting initial value by described master controller (3) to the appointment register of described timer simultaneously, makes it begin counting; By the described normally closed contact signal of continuous Query and described normally opened contact signal, Query Value and count value are buffered in the array, all change until described normally closed contact signal and described normally opened contact signal, and keep more than 0.5 millisecond, according to count frequency, count value is scaled time value, is the release time of measured relay (11);
E. detect operation voltage
Operation voltage according to measured relay (11) nominal, by the selected starting potential less than nominal operation voltage minimum value of described master controller (3), increase step-length and greater than the peaked final voltage of nominal operation voltage, control described relay coil testing circuit, the pressure drop on measured relay (11) coil is progressively increased by the appointment step-length from starting potential; Simultaneously, the described normally closed contact signal of continuous Query and described normally opened contact signal, when the two all changed, the pressure drop on measured relay (11) coil was operation voltage; If behind the arrival final voltage, measured relay (11) is not moved yet, judges that then the operation voltage of measured relay (11) is defective;
F. detect release voltage
Release voltage according to measured relay (11) nominal, by described master controller (3) selected suitable greater than the peaked starting potential of nominal release voltage, reduce step-length and less than the final voltage of nominal release voltage minimum value, control described relay coil testing circuit, the pressure drop on measured relay (11) coil is progressively reduced by the appointment step-length from starting potential; Simultaneously, the described normally closed contact signal of continuous Query and described normally opened contact signal, when the two all changed, the pressure drop on measured relay (11) coil was release voltage; If behind the arrival final voltage, measured relay (11) does not discharge yet, judges that then the release voltage of measured relay (11) is defective;
G. automatic cycle detection
According to the detection times N of setting, repeat A～F step N time;
H. life prediction
Contact resistance, coil resistance, actuation time, release time, operation voltage, release voltage data that detection is obtained, adopt polynomial fitting method to handle respectively, obtain each parameter change curve, predict that this parameter exceeds the cycle index of acceptability limit, deduct the cycle index of having carried out, the residual electricity life-span that obtains predicting.
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