CN104502778A - Detecting device for alternating current entering of direct current system and realizing method of detecting device - Google Patents
Detecting device for alternating current entering of direct current system and realizing method of detecting device Download PDFInfo
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- CN104502778A CN104502778A CN201410742116.2A CN201410742116A CN104502778A CN 104502778 A CN104502778 A CN 104502778A CN 201410742116 A CN201410742116 A CN 201410742116A CN 104502778 A CN104502778 A CN 104502778A
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Abstract
The invention relates to a detecting device for alternating current entering of a direct current system and a realizing method of the detecting device. The detecting device comprises an insulating monitoring circuit and two alternating current leakage sensors, wherein the insulating monitoring circuit comprises a signal sampling circuit, a signal processing circuit, a communication interface circuit, a power circuit and a CPU (central processing unit) circuit; the signal sampling circuit comprises two bridge resistors; each bridge resistor is serially connected with a bus and a ground wire, so that a bus-ground wire loop is formed; each alternating current leakage sensor respectively sleeves the bus-ground wire loop of the insulating monitoring circuit and is electrically connected with the insulating monitoring circuit. Two realizing methods exist according to the output, as analog quantity and digital quantity, of each alternating current leakage sensor; whether the alternating current entering existing in the direct current system can be conveniently detected, and the related information, such as the time of the alternating current entering and the alternating current entering voltage, can be recorded; the detection is not limited by the output form of the alternating current leakage sensors; the selection is flexible, the wiring is simple and the safety and reliability are higher.
Description
Technical field
The present invention relates to a kind of straight-flow system and exchange the pick-up unit and its implementation scurried into.
Background technology
In electric system, the reliability service of straight-flow system, plays vital effect to the safety and stability of whole system, feeding out of straight-flow system relates to multiple subsystem, circuit coverage rate is relatively wider, walks thread environment more complicated, and straight-flow system insulation reduces and earth fault phenomenon happens occasionally; For this problem, straight-flow system is typically equipped with insulating monitoring circuit, for monitoring insulation reduction and the earth fault of straight-flow system.If there is straight-flow system interchange to scurry into fault, phenomenon is that insulation reduces or ground connection intuitively, and its harm is much larger than simple DC earthing.It is increase capacitance, resistor voltage divider circuit at bus to ground circuit that detection method is scurried in the interchange of straight-flow system conventional at present, and follow-up signal processing circuit, isolation sample circuit, extract bus to detect the alternating current voltage component in ground circuit, thus determine whether that interchange occurs scurries into, such a process increases the distributed capacitance of bus to ground circuit, the reliability service of influential system, circuit more complicated, is unfavorable for upgrading and the Reconstruction in field of original insulating monitoring circuit.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of straight-flow system and exchanges the pick-up unit and its implementation scurried into, testing circuit and system busbar are completely isolated on electrically, solve circuit complexity, later maintenance is inconvenient, improve the reliability of system cloud gray model, be conducive to upgrading and the Reconstruction in field of original insulating monitoring circuit.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of straight-flow system exchanges the pick-up unit scurried into, comprise insulating monitoring circuit and ac leakage flow sensor CT1 and CT2, described insulating monitoring circuit comprises signal sample circuit, resistor bridge R1 and R2 in described signal sample circuit is all connected in bus and ground wire and forms bus to ground circuit, and described ac leakage flow sensor CT1 and CT2 is socketed in described insulating monitoring circuit busbar respectively on ground circuit.Wherein, described ac leakage flow sensor CT1 and CT2, it scurries into signal for the interchange gathered in straight-flow system, and by the signal transmission of collection to insulating monitoring circuit; Described insulating monitoring circuit, it processes for the signal gathered ac leakage flow sensor CT1 and CT2, has judged whether that AC signal is scurried into according to result.
Beneficial effect of the present invention is: adopt ac leakage flow sensor to be directly socketed in the bus of signal sample circuit in insulating monitoring circuit on ground circuit, pick-up unit and system busbar are electrically gone up completely isolated, circuit is simple and practical, and the reliability of system cloud gray model is high, convenient later maintenance.
On the basis of technique scheme, the present invention can also do following improvement:
Further, described insulating monitoring circuit also comprises signal processing circuit, communication interface circuit, power circuit and cpu circuit, described signal processing circuit, communication interface circuit are connected with cpu circuit respectively with power circuit, and described ac leakage flow sensor CT1, CT2 are all connected to signal processing circuit and power circuit.
Further, described insulating monitoring circuit also comprises communication interface circuit, power circuit and cpu circuit, described communication interface circuit is connected with cpu circuit respectively with power circuit, and described ac leakage flow sensor CT1, CT2 are all connected to communication interface circuit and power circuit.
Further, the measurement range of described ac leakage flow sensor CT1, CT2 is determined according to the resistance of resistor bridge R1 and R2, and the maximum range of described ac leakage flow sensor CT1, CT2 scurries into electric current close to maximum interchange.
The beneficial effect of above-mentioned further technical scheme is adopted to be: the interchange in Real-Time Monitoring straight-flow system can scurry into situation, not by the limitation of ac leakage flow sensor output form, can select flexibly, convenient and practical, detection efficiency is high, testing result is accurate and visual, does not affect the reliability of bus, achieves intellectualized detection.
A kind of straight-flow system of the present invention exchanges the detection method scurried into, and it is characterized in that, comprises the steps:
Step 1: ac leakage flow sensor CT1 and CT2 gathers positive and negative busbar in straight-flow system and exchanges the induced signal scurrying into signal over the ground, exports insulating monitoring circuit to;
Step 2: insulating monitoring circuit processes the value I1, the I2 that obtain positive and negative busbar ac leakage stream over the ground to the induced signal that detects of ac leakage flow sensor CT1 and CT2 received;
Step 3:CPU circuit is calculated scurry into ac voltage U1, U2 according to value I1, the I2 of ac leakage stream and resistance R1, the R2 of resistor bridge;
Step 4: ac voltage U1, U2 will be scurried into and setting warning value compares, if ac voltage U1 and/or U2 is greater than the warning value of setting, then outputting alarm, record scurry into ac voltage U1 and/or U2, fault-time information in liquid crystal screen display.
The invention has the beneficial effects as follows: adopt said method to calculate the ac voltage scurried in straight-flow system in liquid crystal screen display, can detect eaily in straight-flow system whether have exchange scurry into and can record interchange scurry into time, scurry into the relevant informations such as voltage, detection efficiency is higher, and testing result is accurate.
On the basis of technique scheme, the present invention can also do following improvement:
Further, described straight-flow system exchanges the detection method scurried into, and the specific implementation of wherein said step 2, for being analog output ac leakage flow sensor as described ac leakage flow sensor CT1, CT2, is realized by following steps:
Step 21a: signal processing circuit carries out dividing potential drop sampling to the induced signal that ac leakage flow sensor CT1 and CT2 collects, and obtains predetermined voltage signals M1, M2, its span is 0-5V;
Step 22a: signal processing circuit cushions described predetermined voltage signals, analog-to-digital conversion process, obtains digital signal, and carries out signal isolation to described digital signal, exports cpu circuit to;
Step 23a:CPU circuit reads the digital signal through isolation, according to analog-to-digital relation, is converted into corresponding analog quantity, calculates the value I1 of ac leakage stream, I2.
Further, described straight-flow system exchanges the detection method scurried into, and the specific implementation of wherein said step 2, for being digital output ac leakage flow sensor as described ac leakage flow sensor CT1, CT2, is realized by following steps:
Step 21b: by the rule schemata of setting, cpu circuit sends calling frame, after ac leakage flow sensor CT1 and CT2 receives and calls command checksum correct, to cpu circuit return message frame;
Step 22b: communication interface circuit carries out level conversion to the digital signal that ac leakage flow sensor CT1 and CT2 returns, and carries out isolation processing, exports cpu circuit to after having isolated;
Step 23b:CPU circuit reads the signal through isolation, according to analog-to-digital relation, is converted into corresponding analog quantity, obtains the value I1 of ac leakage stream, I2.
Further, described bus scurries into ac voltage U
i=R
i* I
i.
Further, the warning value of described setting is adjustable.
The beneficial effect of above-mentioned further technical scheme is adopted to be: whether insulating monitoring circuit can detect eaily in straight-flow system to have to exchange by the induced signal that ac leakage flow sensor detects and scurry into and can record time that interchange scurries into, scurry into the relevant informations such as voltage, not by the limitation of ac leakage flow sensor output form, can select flexibly, wiring is simple, and safe reliability is higher.
Accompanying drawing explanation
Fig. 1 is the part-structure structural representation that a kind of straight-flow system of the present invention exchanges the pick-up unit scurried into;
Fig. 2 is the circuit connection diagram that a kind of straight-flow system of the present invention exchanges the detection implementation method 1 scurried into;
Fig. 3 is the circuit connection diagram that a kind of straight-flow system of the present invention exchanges the detection implementation method 2 scurried into.
Embodiment
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
As shown in Figure 1, a kind of straight-flow system exchanges the pick-up unit scurried into, it is characterized in that: comprise insulating monitoring circuit and ac leakage flow sensor CT1 and CT2, described insulating monitoring circuit comprises signal sample circuit, resistor bridge R1 and R2 in described signal sample circuit is all connected in bus and ground wire and forms bus to ground circuit, and described ac leakage flow sensor CT1 and CT2 is socketed in described insulating monitoring circuit busbar respectively on ground circuit.Wherein, described ac leakage flow sensor CT1 and CT2, it scurries into signal for the interchange gathered in straight-flow system, and by the signal transmission of collection to insulating monitoring circuit; Described insulating monitoring circuit, it processes for the signal gathered ac leakage flow sensor CT1 and CT2, has judged whether that ac current signal is scurried into according to result.
As shown in Figure 2, preferably, described insulating monitoring circuit also comprises signal processing circuit, power circuit and cpu circuit, and described signal processing circuit is connected with cpu circuit respectively with power circuit, and described ac leakage flow sensor CT1, CT2 are all connected to signal processing circuit and power circuit.Wherein, described signal processing circuit, it carries out dividing potential drop sampling, buffering, analog to digital conversion and signal isolation processing for the signal gathered ac leakage flow sensor CT1, CT2, and the signal after process is sent to cpu circuit; The digital signal that described cpu circuit exports for reading signal processing circuit, is converted into corresponding analog quantity according to analog to digital conversion relation, calculates, and judged whether that AC signal is scurried into according to result of calculation to the signal after converting; Described power circuit, it is for providing power supply to whole insulating monitoring circuit, ac leakage flow sensor CT1 and CT2.
As described in Figure 3, preferably, described insulating monitoring circuit also comprises communication interface circuit, power circuit and cpu circuit, and described communication interface circuit is connected with cpu circuit respectively with power circuit, and described ac leakage flow sensor CT1, CT2 are all connected to communication interface circuit and power circuit.Wherein, described communication interface circuit, it is for being connected with the communication interface of ac leakage flow sensor CT1, CT2, digital signal is carried out level conversion and signal isolation, sends the signal after process to cpu circuit by the rule schemata of setting; Described cpu circuit is for calling the value of ac leakage stream, reading the digital signal of communication interface circuit output, transfer the registration of Party membership, etc. from one unit to another according to modulus and be converted into corresponding analog quantity, signal after converting is calculated, and has judged whether that AC signal is scurried into according to result of calculation; Described power circuit, it is for providing power supply to whole insulating monitoring circuit, ac leakage flow sensor CT1 and CT2.
In the present invention, the measurement range of described ac leakage flow sensor CT1, CT2 is determined according to the resistance of resistor bridge resistance R1, R2, described resistor bridge R1, R2 are fixed value, 220V system is 33K Ω, 110V system is 20K Ω, and in order to make measurement result more accurate, the maximum range of described ac leakage flow sensor CT1, CT2 scurries into electric current close to maximum interchange, wherein, electric current is scurried in described maximum interchange is the ratio that voltage and resistor bridge R1 or R2 are scurried in maximum interchange.
A kind of straight-flow system in the present invention exchanges the detection method scurried into, and it is characterized in that, comprises the steps:
Step 1: ac leakage flow sensor CT1 and CT2 gathers positive and negative busbar in straight-flow system and exchanges the induced signal scurrying into signal over the ground, exports insulating monitoring circuit to;
Step 2: insulating monitoring circuit processes the value I1, the I2 that obtain positive and negative busbar ac leakage stream over the ground to the induced signal that detects of ac leakage flow sensor CT1 and CT2 received;
Step 3:CPU circuit is calculated scurry into ac voltage U1, U2 according to value I1, the I2 of ac leakage stream and resistance R1, the R2 of resistor bridge;
Step 4: ac voltage U1, U2 will be scurried into and setting warning value compares, if ac voltage U1 and/or U2 is greater than the warning value of setting, then outputting alarm, record scurry into ac voltage U1 and/or U2, fault-time information in liquid crystal screen display.
As shown in Figure 2, preferably, described straight-flow system exchanges the detection method scurried into, and the specific implementation of wherein said step 2, for being analog output ac leakage flow sensor as described ac leakage flow sensor CT1, CT2, is realized by following steps:
Step 21a: signal processing circuit carries out dividing potential drop sampling to the induced signal that ac leakage flow sensor CT1 and CT2 collects, and obtains predetermined voltage signals M1, M2, its span is 0-5V;
Step 22a: signal processing circuit cushions described predetermined voltage signals, analog-to-digital conversion process, obtains digital signal, and carries out signal isolation to described digital signal, exports cpu circuit to;
Step 23a:CPU circuit reads the digital signal through isolation, according to analog-to-digital relation, is converted into corresponding analog quantity, calculates the value I1 of ac leakage stream, I2.
As described in Figure 3, preferably, described straight-flow system exchanges the detection method scurried into, and the specific implementation of wherein said step 2, for being digital output ac leakage flow sensor as described ac leakage flow sensor CT1, CT2, is realized by following steps:
Step 21b: by the rule schemata of setting, cpu circuit sends calling frame, after ac leakage flow sensor CT1 and CT2 receives and calls command checksum correct, to cpu circuit return message frame;
Step 22b: communication interface circuit carries out level conversion to the digital signal that ac leakage flow sensor CT1 and CT2 returns, and carries out isolation processing, exports cpu circuit to after having isolated;
Step 23b:CPU circuit reads the signal through isolation, according to analog-to-digital relation, is converted into corresponding analog quantity, obtains the value I1 of ac leakage stream, I2.
In the present invention, sensor CT1, CT2 of ac leakage stream select according to actual needs, and the warning value of described setting can regulate according to actual conditions, usual desirable 10V.For analog output ac leakage flow sensor and digital output ac leakage flow sensor, respectively by two kinds of different treatment steps, finally all can obtain in straight-flow system, exchanging the magnitude of voltage scurried into, exchange in liquid crystal screen display straight-flow system simultaneously and scurry into magnitude of voltage, scurry into the relevant informations such as time.
In the present invention, a kind of straight-flow system exchanges scurries into pick-up unit and its implementation, can detect eaily in straight-flow system whether have exchange scurry into and can record interchange scurry into time, scurry into the relevant informations such as voltage, not by the limitation of ac leakage flow sensor output form, can select flexibly, wiring is simple, and safe reliability is higher.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, 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. a straight-flow system exchanges the pick-up unit scurried into, it is characterized in that: comprise insulating monitoring circuit and ac leakage flow sensor CT1 and CT2, described insulating monitoring circuit comprises signal sample circuit, resistor bridge R1 and R2 in described signal sample circuit is all connected in bus and ground wire and forms bus to ground circuit, and described ac leakage flow sensor CT1 and CT2 is socketed in described insulating monitoring circuit busbar respectively on ground circuit;
Described ac leakage flow sensor CT1 and CT2, it scurries into signal for the interchange gathered in straight-flow system, and by the signal transmission of collection to insulating monitoring circuit;
Described insulating monitoring circuit, it processes for the signal gathered ac leakage flow sensor CT1 and CT2, has judged whether that AC signal is scurried into according to result.
2. a kind of straight-flow system according to claim 1 exchanges the pick-up unit scurried into, it is characterized in that: described insulating monitoring circuit also comprises signal processing circuit, power circuit and cpu circuit, described signal processing circuit is connected with cpu circuit respectively with power circuit, and described ac leakage flow sensor CT1, CT2 are all connected to signal processing circuit and power circuit;
Described signal processing circuit, it carries out dividing potential drop sampling, buffering, analog to digital conversion and signal isolation processing for the signal gathered ac leakage flow sensor CT1, CT2, and the signal after process is sent to cpu circuit;
The digital signal that described cpu circuit exports for reading signal processing circuit, is converted into corresponding analog quantity according to analog to digital conversion relation, calculates, and judged whether that AC signal is scurried into according to result of calculation to the signal after converting;
Described power circuit, it is for providing power supply to whole insulating monitoring circuit, ac leakage flow sensor CT1 and CT2.
3. a kind of straight-flow system according to claim 1 exchanges the pick-up unit scurried into, it is characterized in that: described insulating monitoring circuit also comprises communication interface circuit, power circuit and cpu circuit, described communication interface circuit is connected with cpu circuit respectively with power circuit, and described ac leakage flow sensor CT1, CT2 are all connected to communication interface circuit and power circuit;
Described communication interface circuit, it is for being connected with the communication interface of ac leakage flow sensor CT1, CT2, digital signal is carried out level conversion and signal isolation, sends the signal after process to cpu circuit by the rule schemata of setting;
Described cpu circuit is for calling the value of ac leakage stream, reading the digital signal of communication interface circuit output, transfer the registration of Party membership, etc. from one unit to another according to modulus and be converted into corresponding analog quantity, signal after converting is calculated, and has judged whether that AC signal is scurried into according to result of calculation;
Described power circuit, it is for providing power supply to whole insulating monitoring circuit, ac leakage flow sensor CT1 and CT2.
4. a kind of straight-flow system according to claim 1 exchanges the pick-up unit scurried into, it is characterized in that: the measurement range of described ac leakage flow sensor CT1, CT2 is determined according to the resistance of resistor bridge R1 and R2, the maximum range of described ac leakage flow sensor CT1, CT2 scurries into electric current close to maximum interchange.
5. straight-flow system exchanges the detection method scurried into, and it is characterized in that, comprises the steps:
Step 1: ac leakage flow sensor CT1 and CT2 gathers positive and negative busbar in straight-flow system and exchanges the induced signal scurrying into signal over the ground, exports insulating monitoring circuit to;
Step 2: insulating monitoring circuit processes the value I1, the I2 that obtain positive and negative busbar ac leakage stream over the ground to the induced signal that detects of ac leakage flow sensor CT1 and CT2 received;
Step 3:CPU circuit is calculated scurry into ac voltage U1, U2 according to value I1, the I2 of ac leakage stream and resistance R1, the R2 of resistor bridge;
Step 4: ac voltage U1, U2 will be scurried into and setting warning value compares, if ac voltage U1 and/or U2 is greater than the warning value of setting, then outputting alarm, record scurry into ac voltage U1 and/or U2, fault-time information in liquid crystal screen display.
6. a kind of straight-flow system according to claim 5 exchanges the detection method scurried into, it is characterized in that, being implemented as when described ac leakage flow sensor CT1, CT2 are analog output ac leakage flow sensor of described step 2, is realized by following steps:
Step 21a: signal processing circuit carries out dividing potential drop sampling to the induced signal that ac leakage flow sensor CT1 and CT2 collects, and obtains predetermined voltage signals M1, M2, its span is 0-5V;
Step 22a: signal processing circuit cushions described predetermined voltage signals, analog-to-digital conversion process, obtains digital signal, and carries out signal isolation to described digital signal, exports cpu circuit to;
Step 23a:CPU circuit reads the digital signal through isolation, according to analog-to-digital relation, is converted into corresponding analog quantity, calculates the value I1 of ac leakage stream, I2.
7. a kind of straight-flow system according to claim 5 exchanges the detection method scurried into, and it is characterized in that, being implemented as when described ac leakage flow sensor is digital output ac leakage flow sensor of described step 2, is realized by following steps:
Step 21b: by the rule schemata of setting, cpu circuit sends calling frame, after ac leakage flow sensor CT1 and CT2 receives and calls command checksum correct, to cpu circuit return message frame;
Step 22b: communication interface circuit carries out level conversion to the digital signal that ac leakage flow sensor CT1 and CT2 returns, and carries out isolation processing, exports cpu circuit to after having isolated;
Step 23b:CPU circuit reads the signal through isolation, according to analog-to-digital relation, is converted into corresponding analog quantity, obtains the value I1 of ac leakage stream, I2.
8. straight-flow system according to claim 5 exchanges and scurries into detection method, it is characterized in that: described bus scurries into ac voltage U
i=R
i* I
i.
9. the straight-flow system according to any one of claim 5 to 8 exchanges and scurries into detection method, it is characterized in that: the warning value of described setting is adjustable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410742116.2A CN104502778A (en) | 2014-12-08 | 2014-12-08 | Detecting device for alternating current entering of direct current system and realizing method of detecting device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410742116.2A CN104502778A (en) | 2014-12-08 | 2014-12-08 | Detecting device for alternating current entering of direct current system and realizing method of detecting device |
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| CN201410742116.2A Pending CN104502778A (en) | 2014-12-08 | 2014-12-08 | Detecting device for alternating current entering of direct current system and realizing method of detecting device |
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| CN106841956A (en) * | 2017-03-31 | 2017-06-13 | 国网江苏省电力公司宿迁供电公司 | A kind of anti-instantaneous ac scurries into insulation monitoring and warning device |
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| CN105823923B (en) * | 2016-03-22 | 2019-07-05 | 成都国能龙源科技有限公司 | DC feeder insulation against ground reduces and exchanges the device and method scurried into while detected |
| CN111929613A (en) * | 2020-08-07 | 2020-11-13 | 中国南方电网有限责任公司超高压输电公司梧州局 | Same-section bus parasitic loop online monitoring device based on alternating current leakage current sensor |
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| CN105823923B (en) * | 2016-03-22 | 2019-07-05 | 成都国能龙源科技有限公司 | DC feeder insulation against ground reduces and exchanges the device and method scurried into while detected |
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| CN111929613A (en) * | 2020-08-07 | 2020-11-13 | 中国南方电网有限责任公司超高压输电公司梧州局 | Same-section bus parasitic loop online monitoring device based on alternating current leakage current sensor |
| CN111929613B (en) * | 2020-08-07 | 2021-09-14 | 中国南方电网有限责任公司超高压输电公司梧州局 | Same-section bus parasitic loop online monitoring device based on alternating current leakage current sensor |
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