CN104849596A - Current protection actuation time test device and method and relay protection test system - Google Patents
Current protection actuation time test device and method and relay protection test system Download PDFInfo
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- CN104849596A CN104849596A CN201510257979.5A CN201510257979A CN104849596A CN 104849596 A CN104849596 A CN 104849596A CN 201510257979 A CN201510257979 A CN 201510257979A CN 104849596 A CN104849596 A CN 104849596A
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Abstract
The invention discloses a current protection actuation time test device and method and a relay protection test system. The current protection actuation time test device comprises a current acquisition module, a conversion module, a comparison module and a timer. The current acquisition module is used for acquiring current of a loop to be tested. The input end of the conversion module is connected with the current acquisition module and used for converting current acquired by the current acquisition module so that conversion quantity is obtained. The first input end of the comparison module is connected with the output end of the conversion module, and reference quantity is accessed to the second input end of the comparison module. The starting end of the timer is connected with the output end of the comparison module. With application of the current protection actuation time test device, a problem that current protection actuation time cannot be tested when current changes is solved.
Description
Technical field
The present invention relates to power domain, in particular to a kind of current protection proving installation actuation time and method and relay protection test system.
Background technology
Protecting electrical power system commissioning staff, when carrying out current protection debugging, needs to test actuation time current protection, relay protection test platform generally can be utilized to carry out, and such as, uses hardware synchronization or software synchronization to start the method for timing.But only just need starting current relay testing when current source change or curent change at some scene; such as; the protection that motor quick-break low value etc. just need drop into after simulating motor startup terminates; measuring current operating time of protection cannot be carried out by relay protection test platform, and also there is no simple and reliable method of testing in prior art.
For in correlation technique cannot when curent change the problem of measuring current operating time of protection, at present effective solution is not yet proposed.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of current protection proving installation actuation time and method and relay protection test system, with to solve in correlation technique cannot when curent change the problem of measuring current operating time of protection.
To achieve these goals, according to an aspect of the present invention, a kind of current protection proving installation actuation time is provided.
Current protection proving installation actuation time according to the present invention comprises: current acquisition module, and wherein, current acquisition module is for gathering the electric current in loop to be tested; Modular converter, wherein, the input end of modular converter is connected to current acquisition module, for changing the electric current of current acquisition module acquires, obtains conversion amount; Comparison module, wherein, the first input end of comparison module is connected to the output terminal of modular converter, second input end access datum quantity of comparison module, comparison module is used for conversion amount to compare with datum quantity, when conversion amount is more than or equal to datum quantity, exports the first signal, when conversion amount is less than datum quantity, export secondary signal; And timer, wherein, the start end of timer is connected to the output terminal of comparison module, and when comparison module exports the first signal, timer starts timing.
Further, modular converter is direct current transducer, and wherein, direct current transducer is used for the electric current of current acquisition module acquires to be converted to DC voltage.
Further, datum quantity is reference voltage, and comparison module comprises: voltage comparator, and wherein, the first input end of voltage comparator is connected to the output terminal of direct current transducer, for comparing DC voltage and reference voltage; And reference voltage regulating circuit, the input termination power supply of reference voltage regulating circuit, the output terminal of reference voltage regulating circuit is connected to the second input end of voltage comparator, and wherein, reference voltage regulating circuit is for regulating the size of reference voltage.
Further, modular converter is analog to digital converter, and wherein, analog to digital converter is used for the simulation current flow of current acquisition module acquires to be converted to digital current amount.
Further, datum quantity is base value word current amount, and comparison module comprises: digital comparator, and wherein, the first input end of digital comparator is connected to the output terminal of analog to digital converter, for digital current amount being compared with base value word current amount; And base value word current amount regulating circuit, be connected with the second input end of digital comparator, for regulating the size of base value word current amount.
Further, comparison module is single-chip microcomputer, wherein, the input end of single-chip microcomputer is connected to the output terminal of analog to digital converter, the start end of the output termination timer of single-chip microcomputer, when the current value of single-chip microcomputer input end input is greater than pre-set current value, single-chip microcomputer exports preset voltage value, when driving timer.
Further, device also comprises driver module, wherein, the first end of driver module is connected to the output terminal of comparison module, second end of driver module is connected to the start end of timer, when comparison module exports the first signal, during driver module outputting drive voltage driving timer.
To achieve these goals, according to an aspect of the present invention, provide a kind of relay protection test system and comprise relay-protection tester and above-mentioned current protection proving installation actuation time.
To achieve these goals, according to an aspect of the present invention, provide a kind of current protection method of testing actuation time to comprise: the electric current gathering loop to be tested; The electric current gathered is changed, obtains conversion amount; Described conversion amount is compared with datum quantity; And when described conversion amount is more than or equal to described datum quantity, timer starts timing.
Pass through the present invention; adopt the electric current in current acquisition module Real-time Collection loop to be tested; the electric current of collection is compared with datum quantity after modular converter conversion; start timer when the conversion amount that the electric current gathered is corresponding is greater than datum quantity and start timing; to solve in correlation technique cannot when curent change the problem of measuring current operating time of protection, and then reach the effect of the measuring current operating time of protection when curent change.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of current protection proving installation actuation time according to the embodiment of the present invention;
Fig. 2 is the schematic diagram of current protection proving installation actuation time according to a second embodiment of the present invention;
Fig. 3 is the schematic diagram of current protection proving installation actuation time according to a third embodiment of the present invention;
Fig. 4 is the schematic diagram of the encapsulation of current protection proving installation actuation time according to the embodiment of the present invention;
Fig. 5 is the schematic diagram of the relay protection test system according to the embodiment of the present invention; And
Fig. 6 is the process flow diagram of current protection method of testing actuation time according to the embodiment of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
The application's scheme is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the embodiment of the application's part, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the application's protection.
It should be noted that, term " first ", " second " etc. in the instructions of the application and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged, in the appropriate case so that the embodiment of the application described herein.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
According to the embodiment of the present invention, provide a kind of current protection proving installation actuation time, Fig. 1 is the schematic diagram of current protection proving installation actuation time according to the embodiment of the present invention.
As shown in Figure 1, this current protection proving installation actuation time comprises: current acquisition module 10, modular converter 20, comparison module 30 and timer 40.
Current acquisition module 10, wherein, current acquisition module 10 is for gathering the electric current in loop to be tested.
Current acquisition module 10 can be current sensor, and particularly, current sensor can be connected in loop to be tested, wherein, namely loop to be tested needs the circuit loop of test circuit operating time of protection.In order to not affect the accuracy of current measurement, high precision electric current transducer can be adopted to gather the electric current in loop to be tested, high precision electric current transducer is connected serially in loop to be tested and is equivalent to straight-through wire, can not affect the electric current in loop to be tested.
Modular converter 20, wherein, the input end of modular converter 20 is connected to current acquisition module 10, changes, obtain conversion amount for the electric current gathered current acquisition module 10.
Modular converter 20 is connected with current acquisition module 10, changes for electric current current acquisition module 10 gathered, and obtains conversion amount, such as, electric current is converted to voltage, or simulation current flow is converted to digital current amount, etc.Modular converter 20 can be direct current transducer, also can be analog to digital converter.
Comparison module 30, wherein, the first input end of comparison module 30 is connected to the output terminal of modular converter 20, second input end access datum quantity of comparison module 30, comparison module 30, for conversion amount being compared with datum quantity, when conversion amount is more than or equal to datum quantity, exports the first signal, when conversion amount is less than datum quantity, export secondary signal.
Comparison module 30 comprises two input ends, i.e. first input end and the second input end, and wherein, first input end is connected with modular converter 20, and for inputting the inversion quantity that modular converter 20 exports, the second input end is used for input reference amount.Datum quantity is the threshold value preset, and compares, when conversion amount is more than or equal to datum quantity for the inversion quantity exported with modular converter 20, export the first signal, the first signal can be high level, when conversion amount is less than datum quantity, export secondary signal, secondary signal can be low level.Particularly, when the inversion quantity that modular converter 20 exports is voltage, datum quantity is reference voltage, and when the inversion quantity that modular converter 20 exports is digital current amount, datum quantity is base value word current amount.Particularly, the protection ratings of datum quantity and current protective device is corresponding, such as; the protection ratings of current protective device is 10A, and namely when the electric current in loop to be tested is greater than 10A, current protective device performs current protection action; now, inversion quantity is also greater than datum quantity, exports the first signal.
Timer 40, wherein, the start end of timer 40 is connected to the output terminal of comparison module 30, and when comparison module 30 exports the first signal, timer starts timing.
Timer 40 can be millisecond timer.Particularly, when comparison module 30 exports the first signal, illustrate that the electric current in loop to be tested is greater than the protection ratings of current protective device; now current protective device performs current protection action; meanwhile, timer 40 starts timing, achieves timer 40 and current protective device action simultaneously.When carrying out current protection and testing actuation time, can by the protection act contact of the termination termination current protective device of timer 40, thus can be implemented in timer 40 when current protective device stops current protection action and stop timing.
The embodiment of the present invention gathers the electric current in loop to be tested by current acquisition module 10, the electric current gathered by modular converter 20 pairs of current acquisition modules 10 is changed, obtain conversion amount, by comparison module 30, conversion amount and datum quantity are compared, when conversion amount is greater than datum quantity, illustrate that the electric current in loop to be tested is greater than the protection ratings of current protective device, now, current protective device and timer 40 action simultaneously, wherein, current protective device performs current protection action, timer 40 performs timing action, due in advance by the protection act contact of the termination termination current protective device of timer 40, when current protective device stops current protection action, timer 40 stops timing, thus achieve in curent change process, to realize current protection test actuation time, to solve in prior art cannot when curent change the problem of measuring current operating time of protection.
Preferably, modular converter 20 is direct current transducer, and wherein, direct current transducer is used for the electric current that current acquisition module 10 gathers to be converted to DC voltage.
Direct current transducer is used for the electric current that current acquisition module 10 gathers to be converted to DC voltage, and as shown in Figure 2, the measuring current that current sensor gathers is via the input pin V of direct current transducer AD737
inafter, the voltage obtained after conversion is via the output pin V of direct current transducer AD737
outexport, wherein, direct current transducer AD737 is the true root mean square direct current transducer of a low-power consumption, precision, single-chip.
Alternatively, datum quantity is reference voltage, and comparison module 30 comprises: voltage comparator, and wherein, the first input end of voltage comparator is connected to the output terminal of direct current transducer, for comparing DC voltage and reference voltage; And reference voltage regulating circuit, the input termination power supply of reference voltage regulating circuit, the output terminal of reference voltage regulating circuit is connected to the second input end of voltage comparator, and wherein, reference voltage regulating circuit is for regulating the size of reference voltage.
Voltage comparator conveniently can realize the comparison of two input voltages, in embodiments of the present invention, an input end of voltage comparator is connected to the output terminal of direct current transducer, another input termination reference voltage of voltage comparator, thus realize the DC voltage of direct current transducer output and the comparison of reference voltage.Reference voltage regulating circuit for realizing the adjustment of reference voltage, thus can arrange corresponding reference voltage according to the demand of user, and reference voltage is regulated and can be realized by variable resistor, changes reference voltage value by regulating variable-resistance value.
Particularly, as shown in Figure 2, the pin one 1 of voltage comparator LM311 is connected to the V of direct current transducer AD737
outpin, reference voltage regulating circuit comprises resistance R3 and variable resistor R4, variable resistor R4 is connected on 9V power supply via resistance R3, the sliding end of resistance R4 is connected to the pin one 2 of voltage comparator LM311, reference voltage can be realized by the sliding end of swept resistance R4 to regulate, wherein, the value of resistance R3 is 120K Ω, and the value of resistance R4 is 100K Ω.The pin one 3 of voltage comparator LM311 is connected to the negative pole of 9V power supply, the pin one 4 of voltage comparator LM311 and pin one 5 are all connected to the collector of triode Q1, the emitter of triode Q1 is connected to the negative pole of 9V power supply via resistance R5, the base stage of triode Q1 is connected to the positive pole of 9V power supply via K switch 2, the pin one 6 of voltage comparator LM311 is connected to the base stage of triode Q2 via resistance R7, the emitter of triode Q2 is connected to the negative pole of 9V power supply, the collector of triode Q2 is connected to the positive pole of 9V power supply via diode D2, light emitting diode D1 resistance in series R6, diode D2 and 9V dry cell J is in parallel.The pin one 7 of voltage comparator LM311 is connected to the positive pole of 9V power supply.The anode of electric capacity C4 is connected on the positive pole of 9V power supply, and the negative electrode of electric capacity C4 is connected to the negative pole of 9V power supply via electric capacity C5, the negative electrode of electric capacity C3 is connected to the V of direct current transducer AD737
outpin, the anode of electric capacity C3 and the equal ground connection of negative electrode of electric capacity C4, the anode of electric capacity C2 is connected to the pin 5 of direct current transducer AD737, the negative electrode of electric capacity C2 is connected to the negative pole of 9V power supply, and wherein, the value of electric capacity C4 and electric capacity C5 is 4.7uF, the value of electric capacity C3 is 10uF, and the value of electric capacity C2 is 33uF.One end of resistance R1 is connected to the pin 7 of direct current transducer AD737, and the other end of resistance R1 is connected to the negative pole of 9V power supply via resistance R2, and wherein, the value of resistance R1 and resistance R2 is 100K Ω.The pin one of direct current transducer AD737 is connected to the pin 8 of direct current transducer AD737 via electric capacity C1, pin 8 ground connection of direct current transducer AD737, and wherein, the value of electric capacity C1 is 10uF, and the pin 4 of direct current transducer AD737 is connected to the negative pole of 9V power supply.Current protective device 50 and current sensor DIS-TA20 are all series in loop to be tested.
The measuring current I that current sensor DIS-TA20 gathers from loop to be tested carries out being converted to DC voltage through direct current transducer AD737; and input to voltage comparator LM311; compare with reference voltage value; when DC voltage is greater than reference voltage value; voltage comparator LM311 exports high level; current protection proving installation actuation time of the embodiment of the present invention exports 9V voltage signal and relay tip trigger pip; timer 40 can be connected to relay tip, also can be connected to the output terminal of 9V voltage signal.Thus, timing can be started by triggered timer 40 by 9V voltage signal or relay tip trigger pip.
Preferably, modular converter 20 is analog to digital converter, and wherein, analog to digital converter is used for the simulation current flow that current acquisition module 10 gathers to be converted to digital current amount.
Analog to digital converter and A/D converter, for analog quantity is converted to digital quantity, in embodiments of the present invention, analog to digital converter is used for the simulation current flow that current acquisition module 10 gathers to be converted to digital current amount.As shown in Figure 3, current collection circuit 101 is connected to A/D change-over circuit 201, thus the simulation current flow realizing current collection circuit 101 collection is converted to digital current amount, wherein, A/D change-over circuit and A/D converter, A/D change-over circuit is connected to digital display circuit 202, thus the digital current amount obtained after realizing display conversion in real time.
Preferably, datum quantity is base value word current amount, and comparison module 30 comprises: digital comparator, and wherein, the first input end of digital comparator is connected to the output terminal of analog to digital converter, for digital current amount being compared with base value word current amount; And base value word current amount regulating circuit, be connected with the second input end of digital comparator, for regulating the size of base value word current amount.
Digital comparator can be digital comparator, for comparing the size of two digital quantities, such as, compares the size of two binary numbers, for comparing the digital current amount and the size of base value word current amount that analog to digital converter exports in the embodiment of the present invention.Base value word current amount regulating circuit is for regulating the size of base value word current amount, particularly, also the adjustment of reference current can be realized by reference adjustment circuit, again reference current is converted to base value word current amount by A/D change-over circuit, as shown in Figure 3, the adjustment of reference current is realized by reference adjustment circuit 303, by A/D change-over circuit 302, reference current is being converted to base value word current amount, wherein, A/D change-over circuit 302 is connected to digital display circuit 304, for showing base value word current amount in real time.
Particularly, as shown in Figure 3, digital comparator 301 input end is connected to the output terminal of A/D change-over circuit 201, for inputting the digital current amount of the electric current conversion in loop to be tested, another input end of digital comparator 301 is connected to reference adjustment circuit 303 via A/D change-over circuit 302, for input reference digital current amount.Digital comparator 301 compares the size of the digital current amount of A/D change-over circuit 201 input and the base value word current amount of A/D change-over circuit 302 input, when the digital current amount that A/D change-over circuit 201 inputs is greater than the base value word current amount of A/D change-over circuit 302 input, by output circuit 60 output voltage signal and relay tip output signal, by voltage signal and or relay tip output signal triggered timer 40 start timing.
Preferably, comparison module is single-chip microcomputer, wherein, the input end of single-chip microcomputer is connected to the output terminal of analog to digital converter, the start end of the output termination timer of single-chip microcomputer, when the current value of single-chip microcomputer input end input is greater than pre-set current value, single-chip microcomputer exports preset voltage value, when driving timer.
Single-chip microcomputer (Single chip microcomputer) is a kind of integrated circuit (IC) chip, is to adopt very large scale integration technology having the little and perfect microcomputer system of that the central processor CPU of data-handling capacity, random access memory ram, read only memory ROM, multiple I/O mouth and the function i ntegration such as interrupt system, timer/counter to one piece of silicon chip are formed.The output terminal of analog to digital converter is connected to the input/output end port of single-chip microcomputer, i.e. I/O mouth, and the digital current amount that the electric current realizing loop to be tested is converted to inputs in single-chip microcomputer.The digital current amount that the electric current that can realize loop to be tested by carrying out software programming to single-chip microcomputer is converted to compares with base value word current amount, and start timing when digital current amount is greater than base value word current amount by single-chip microcomputer output voltage signal triggered timer 40, such as, 9V voltage, also can work as when digital current amount is greater than base value word current amount and start timing by single-chip microcomputer output relay contact point signal with triggered timer 40.
Alternatively, device also comprises driver module, wherein, the first end of driver module is connected to the output terminal of comparison module, second end of driver module is connected to the start end of timer, when comparison module exports the first signal, during driver module outputting drive voltage driving timer.Particularly, this driver module can be voltage follower circuit and or relay, when comparison module 30 show that conversion amount is greater than datum quantity, the voltage signal exported by this voltage follower circuit can drive timer 40 action, also can be by the action of relay tip signal triggered timer 40, also can be voltage signal and the action of relay tip signal common triggered timer 40 of voltage follower circuit output.
The encapsulation of current protection proving installation actuation time of the embodiment of the present invention as shown in Figure 4; current protection proving installation actuation time 001 be somebody's turn to do comprises a test starting switch 01; reference value regulates button 02, two electric current input jacks 03, two signal output plugholes 04.In addition, each components and parts of current protection proving installation actuation time of the embodiment of the present invention all can adopt high speed components and parts, thus ensure export postpone within 1ms, and protecting electrical power system action differential minimum be 300ms, therefore can not affect measuring accuracy.Be described for the current protection that test motor quick-break etc. just need drop into after simulating motor startup terminates, when utilizing the current protection proving installation actuation time test stream operating time of protection of the embodiment of the present invention, following three aspects should be noted: one is increase measuring current to answer instantaneous increase, in order to avoid cause test error during electric current rising edge; Two is should test operating time of protection to protect action message electric current (being generally 1.2 times of ratings); Three is do not start timing if do not added after starting current millisecond meter just starts timing or protection act after connecting Test Switchboard, is reference current and does not set, should be set to the numerical value of more than the following normal current of starting current numerical value.
As can be seen from the above description, present invention achieves following technique effect:
The embodiment of the present invention gathers the electric current in loop to be tested by current acquisition module 10, the electric current gathered by modular converter 20 pairs of current acquisition modules 10 is changed, obtain conversion amount, by comparison module 30, conversion amount and datum quantity are compared, when conversion amount is greater than datum quantity, illustrate that the electric current in loop to be tested is greater than the protection ratings of current protective device, now, current protective device and timer 40 action simultaneously, wherein, current protective device performs current protection action, timer 40 performs timing action, due in advance by the protection act contact of the termination termination current protective device of timer 40, when current protective device stops current protection action, timer 40 stops timing, thus achieve in curent change process, to realize current protection test actuation time, to solve in prior art cannot when curent change the problem of measuring current operating time of protection, in addition, the current protection proving installation actuation time structure of the embodiment of the present invention is simple, easy to carry and simple to operate.
According to embodiments of the invention, provide a kind of relay protection test system, this relay protection test system comprises: relay-protection tester and above-mentioned current protection proving installation actuation time.
Relay-protection tester can test the characteristic of various relay, such as, and the pickup time and trip time etc. of the pick-up voltage value of the relays such as current relay, voltage relay, auxiliary reclay, pickup value, contact.Current protection proving installation actuation time may be used for test measuring current operating time of protection when curent change; therefore, this relay protection test system characteristic that not only can test various relay but also the current protection actuation time can tested when curent change.Particularly; as shown in Figure 5; current protection proving installation actuation time 001 is connected with relay-protection tester 002 by an electric current input jack 003; current protection proving installation actuation time 001 is connected with comprehensive protector 003 by another electric current input jack; current protection proving installation actuation time 001 is connected with the startup jack 05 of comprehensive protector 004 by signal output plughole, and comprehensive protector 004 is connected with comprehensive protector 003 by stopping jack 06.Can the characteristic such as electric current, voltage of test synthesis protective device by relay-protection tester 002; the current protection actuation time when curent change can be tested in conjunction with current protection proving installation actuation time 001; such as; the actuation time of the low value protection of test motor quick-break, solving in prior art when curent change cannot the problem of measuring current operating time of protection.
According to the embodiment of the present invention, provide a kind of current protection method of testing actuation time.Fig. 6 is the process flow diagram of current protection method of testing actuation time according to the embodiment of the present invention.As shown in Figure 6, the method comprises the steps that S602 is to step S608:
Step S602: the electric current gathering loop to be tested.
Namely loop to be tested needs the circuit loop of test circuit operating time of protection, particularly, and can by current sensor being serially connected in loop to be tested the object reaching the electric current gathering loop to be tested.
Step S604: the electric current gathered is changed, obtains conversion amount.
Carrying out conversion to the electric current gathered can be, by direct current transducer, the electric current of collection is converted to DC voltage, also can be, by analog to digital converter, the analog current of collection is converted to digital current amount, correspondingly, conversion amount can be DC voltage, also can be digital current amount.
Step S606: described conversion amount is compared with datum quantity.
Datum quantity is the threshold value preset, corresponding with above-mentioned conversion amount, namely when above-mentioned change amount into DC voltage time, this datum quantity is also DC voltage, when above-mentioned change amount into digital current amount time, this datum quantity is also digital current amount.This datum quantity is corresponding with the ratings of current protective device action, and such as, when the electric current in loop to be tested is greater than 10A, current protective device performs current protection action, and now, datum quantity should be set to the value that 10A electric current carries out being converted to.
Step S608: when conversion amount is more than or equal to datum quantity, timer starts timing.
When above-mentioned conversion amount is greater than datum quantity; illustrate that the electric current in loop to be tested is greater than the ratings of current protective device action, now current protective device performs current protection action, simultaneously; timer starts timing, achieves timer and current protective device action simultaneously.Particularly; can in advance by the protection act contact of the termination termination current protective device of timer; thus; when current protective device stops current protection action, timer stops timing; thus achieve in curent change process, to realize current protection test actuation time, to solve in prior art cannot when curent change the problem of measuring current operating time of protection.
It should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the process flow diagram of accompanying drawing, and, although show logical order in flow charts, but in some cases, can be different from the step shown or described by order execution herein.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. current protection proving installation actuation time, is characterized in that, comprising:
Current acquisition module, wherein, described current acquisition module is for gathering the electric current in loop to be tested;
Modular converter, wherein, the input end of described modular converter is connected to described current acquisition module, for changing the electric current of described current acquisition module acquires, obtains conversion amount;
Comparison module, wherein, the first input end of described comparison module is connected to the output terminal of described modular converter, second input end access datum quantity of described comparison module, described comparison module is used for described conversion amount to compare with described datum quantity, when described conversion amount is more than or equal to described datum quantity, exports the first signal, when described conversion amount is less than described datum quantity, export secondary signal; And
Timer, wherein, the start end of described timer is connected to the output terminal of described comparison module, and when described comparison module exports the first signal, described timer starts timing.
2. current protection proving installation actuation time according to claim 1, is characterized in that, described modular converter is direct current transducer, and wherein, described direct current transducer is used for the electric current of described current acquisition module acquires to be converted to DC voltage.
3. current protection proving installation actuation time according to claim 2, is characterized in that, described datum quantity is reference voltage, and described comparison module comprises:
Voltage comparator, wherein, the first input end of described voltage comparator is connected to the output terminal of described direct current transducer, for more described DC voltage and described reference voltage; And
Reference voltage regulating circuit, the input termination power supply of described reference voltage regulating circuit, the output terminal of described reference voltage regulating circuit is connected to the second input end of described voltage comparator, and wherein, described reference voltage regulating circuit is for regulating the size of described reference voltage.
4. current protection proving installation actuation time according to claim 1, is characterized in that, described modular converter is analog to digital converter, and wherein, described analog to digital converter is used for the simulation current flow of described current acquisition module acquires to be converted to digital current amount.
5. current protection proving installation actuation time according to claim 4, is characterized in that, described datum quantity is base value word current amount, and described comparison module comprises:
Digital comparator, wherein, the first input end of described digital comparator is connected to the output terminal of described analog to digital converter, for described digital current amount being compared with described base value word current amount; And
Base value word current amount regulating circuit, is connected with the second input end of described digital comparator, for regulating the size of described base value word current amount.
6. current protection proving installation actuation time according to claim 4; it is characterized in that; described comparison module is single-chip microcomputer; wherein; the input end of described single-chip microcomputer is connected to the output terminal of described analog to digital converter, the start end of timer described in the output termination of described single-chip microcomputer, when the current value of described single-chip microcomputer input end input is greater than pre-set current value; described single-chip microcomputer exports preset voltage value, when driving described timer.
7. current protection proving installation actuation time according to claim 1; it is characterized in that; described device also comprises driver module; wherein; the first end of described driver module is connected to the output terminal of described comparison module; second end of described driver module is connected to the start end of described timer, when described comparison module exports the first signal, when described driver module outputting drive voltage drives described timer.
8. a relay protection test system, is characterized in that, described relay protection test system comprises relay-protection tester and current protection proving installation actuation time described in any one of claim 1 to 7.
9. current protection method of testing actuation time, is characterized in that, comprising:
Gather the electric current in loop to be tested;
The electric current gathered is changed, obtains conversion amount;
Described conversion amount is compared with datum quantity; And
When described conversion amount is more than or equal to described datum quantity, timer starts timing.
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| CN201510257979.5A Pending CN104849596A (en) | 2015-05-19 | 2015-05-19 | Current protection actuation time test device and method and relay protection test system |
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Application publication date: 20150819 |