CN102590676B - Device and method for detecting fault of direct current looped network of direct current power supply system - Google Patents
Device and method for detecting fault of direct current looped network of direct current power supply system Download PDFInfo
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Abstract
The invention provides a device for detecting fault of a direct current looped network of a direct current power supply system and a detection method for detecting fault of the direct current looped network of the direct current power supply system. The detection device comprises two balanced bridge units, two voltage collecting units, two grounded control units and at least one processor. The device detects and measures the voltages to earth of anodes and cathodes of two groups of direct current buses and judges the two groups of looped networks of a direct current system and the character of the looped networks according to correspondence of the voltage values. With adoption of above technology to detect the looped networks, the invention is able to detect the fault of the looped networks immediately and send an alarm signal. During detection, no low frequency signals are injected to the direct current system so as to ensure safe and stable operation of the direct current system.
Description
Technical field
The present invention relates to DC power-supply system monitoring technique field, especially relate to a kind of device and method that detects looped network of DC power fault.
Background technology
In order to improve the reliability of DC power system power supply, transformer station more than 110kV and generating plant adopt two group storage batteries and charging device mostly, and load is averagely allocated to two groups of independently-powered straight-flow systems.For important load, from two groups of straight-flow systems, through isolating switch or fuse, draw feeder line respectively, and select any one group of straight-flow system power supply.According to electric power system design standard, two groups of necessary independent operatings of straight-flow system, but in actual moving process, there is ring network fault phenomenon, two groups of straight-flow systems have one or more electrical connections, bring serious harm to the safe and stable operation of electric system.
The harm of < < straight-flow system ring network fault and processing > > (Guangdong Electric Power, the 23rd volume, the 9th phase) reason that a literary composition produces looped network is summarized, and the reason that ring network fault occurs mainly contains:
1. in the work progress of newly-built, enlarging or technological transformation, the power lead of load is accessed to two groups of straight-flow systems simultaneously;
2. operation maintenance personnel while falling load operation, make two groups of straight-flow system paired runnings;
3. original one group of straight-flow system, then increase by one group of straight-flow system, the load of distributing to newly-built straight-flow system still has electrical connection with former straight-flow system;
4. same cable has the current supply circuit of two groups of straight-flow systems, because the insulation of cable declines, causes two groups of straight-flow systems to be connected.
Straight-flow system generation looped network, may cause straight-flow system fire, shorten accumulator life-span, cause equipment tripping, or because single-point grounding causes protective relaying maloperation.Given this, part electric company or producer have set about the monitoring to looped network and have studied, and develop the device that detects ring network fault.As development > > mono-literary composition of the DC earthing route selection of < < novel intelligent and looped network locating device has been introduced, a kind of looped network detects and the device of location, its principle is to inject low-frequency alternating signal to one group of DC bus, at second group of DC bus, receive, if generation ring network fault, the low frequency signal that injected must be put with the earth and be formed loop by looped network, by low frequency signal on second group of DC bus, have or not to detect whether ring network fault occur, the loop of determining that by being positioned at the sensor of each feeder line branch road looped network occurs.
But operation shows, the straight-flow system that is injected to of low frequency signal is brought ripple, for the safe and stable operation of straight-flow system brings hidden danger.The insulation monitoring and warning device of ground connection is searched with clearly proposing in power supply AC/DC integrated systems technology standard > >, should not adopt that DC bus is injected to low frequency signal working method in the < < station of national grid issue.At present, there is no and adopt the looped network pick-up unit of additive method or there is the D.C. isolation monitoring device that looped network detects.
Summary of the invention
The object of this invention is to provide a kind of device and method that detects DC power-supply system looped network of DC power fault, this device, without injecting low frequency signal to DC bus, has straight-flow system looped network measuring ability, guarantees that straight-flow system safely and steadily runs.
In order to realize object of the present invention, the special pick-up unit that proposes a kind of DC power-supply system looped network of DC power fault, is arranged on and is provided with two groups each other in the direct supply controller switching equipment of the accumulator of redundancy, and described pick-up unit comprises:
Two balanced bridge unit, one of them balanced bridge unit is connected between described first group of DC bus positive pole and first group of DC bus negative pole, and another balanced bridge unit is connected between second group of DC bus positive pole and second group of DC bus negative pole;
Two voltage acquisition units, one of them voltage acquisition unit is connected in first group of DC bus, gathers the anodal voltage-to-ground of first group of DC bus and negative pole voltage-to-ground; Another voltage acquisition unit is connected in second group of direct current, gathers the anodal voltage-to-ground of second group of DC bus and negative pole voltage-to-ground;
Two ground connection control modules, one of them ground connection control module is connected between the balanced bridge unit and the earth of first group of DC bus, and another ground connection control module is connected between the balanced bridge unit and the earth of second group of DC bus;
At least one processor, described processor is processed for anodal voltage-to-ground and the negative pole voltage-to-ground of two groups of DC buss that described two voltage acquisition units are collected, and for controlling whether ground connection of described ground connection control module.
Described ground connection control module at least comprises a grounding switch, and the folding condition of this grounding switch is controlled by described processor.
Described grounding switch is controlled mechanical relay or controlled electronic relay.
As embodiments of the invention, described balanced bridge unit comprises the equal balance resistance of at least two group resistances, every group of balance resistance at least comprises a balance resistance, wherein, one group of balance resistance is connected between DC bus positive pole and grounding switch, another group balance resistance is connected between DC bus negative pole and grounding switch.
Described balanced bridge unit gathers anodal voltage-to-ground and the negative pole voltage-to-ground of bus as described voltage acquisition unit, the voltage signal gathering carries out signal condition through a sampled signal conditioning unit, give an AD converter, described AD converter is converted to digital signal by the simulating signal of input, gives described processor.
Described AD converter can be independently, also can be integrated in processor; Described sampled signal conditioning unit is comprised of linear isolation, amplification or filter circuit module; Described circuit linearity insulating circuit module comprises isolation operational amplifier, linear optical coupling or integrated isolated form voltage transformation module, and the voltage signal of balanced bridge unit output is carried out to signal isolation; Described amplifying circuit module is amplified the voltage signal of isolation, to adapt to the input requirements of AD converter; Described filter circuit module filtering is coupling in the undesired signal on voltage signal.
As an alternative embodiment of the invention, described voltage acquisition unit is for measuring one of instrument, voltage monitor or D.C. isolation monitoring device of the anodal voltage-to-ground of DC bus and DC bus negative pole voltage-to-ground; Described processor is connected with described voltage acquisition unit by communicating circuit, obtains the anodal voltage-to-ground value of DC bus and DC bus negative pole voltage-to-ground value.
The present invention also proposes a kind of detection method of DC power-supply system looped network of DC power fault, comprises step:
1) measure the anodal voltage-to-ground U of first group of DC bus
1+, first group of DC bus negative pole voltage-to-ground U
1-, second group of anodal voltage-to-ground U of DC bus
2+with second group of DC bus negative pole voltage-to-ground U
2-;
2) above-mentioned two groups of DC bus both positive and negative polarity voltage-to-ground values are made the following judgment:
If a) U
1+=U
2+, disconnect the grounding switch K1 of first group of DC bus or the grounding switch K2 of second group of DC bus, and gather U
1+, U
1-, U
2+, U
2-if still there is U
1+=U
2+, can be judged to be two groups of straight-flow system looped networks, looped network character is anodal directly looped network;
B) if U
1-=U
2-, disconnect the grounding switch K1 of first group of DC bus or the grounding switch K2 of second group of DC bus, and gather U
1+, U
1-, U
2+, U
2-if still there is U
1-=U
2-, can be judged to be two groups of straight-flow system looped networks, looped network character is the direct looped network of negative pole;
C) if U
1+=U
2-, disconnect the grounding switch K1 of first group of DC bus or the grounding switch K2 of second group of DC bus, and gather U
1+, U
1-, U
2+, U
2-if still there is U
1+=U
2-, can be judged to be two groups of straight-flow system looped networks, looped network character is first group of straight-flow system positive pole and second group of direct looped network of straight-flow system negative pole;
D) if U
1-=U
2+, disconnect the grounding switch K1 of first group of DC bus or the grounding switch K2 of second group of DC bus, and gather U
1+, U
1-, U
2+, U
2-if still there is U
1-=U
2+, can be judged to be two groups of straight-flow system looped networks, looped network character is first group of straight-flow system negative pole and second group of anodal directly looped network of straight-flow system;
3) regularly make the following judgment:
Disconnect the grounding switch K1 of first group of DC bus, gather second group of DC bus both positive and negative polarity voltage-to-ground U
2+, U
2-, with the second group of DC bus both positive and negative polarity voltage-to-ground U disconnecting before K1
2+, U
2-relatively, if there is significant change, be judged to be two groups of straight-flow system looped networks.
In step 3, can also disconnect the grounding switch K2 of second group of DC bus, gather first group of DC bus both positive and negative polarity voltage-to-ground U
1+, U
1-, with the first group of DC bus both positive and negative polarity voltage-to-ground U disconnecting before K2
1+, U
1-relatively, if there is significant change, be judged to be two groups of straight-flow system looped networks.
The present invention adopts above-mentioned technology to carry out looped network detection, ring network fault can be detected in time, and send alerting signal; During detection, without low-frequency signal injection straight-flow system, guaranteed that straight-flow system safely and steadily runs.
Accompanying drawing explanation
Fig. 1 is principle of device block diagram of the present invention;
Fig. 2 is the theory diagram of embodiments of the invention 1;
Fig. 3 is the theory diagram of the embodiment of the present invention 2;
Fig. 4 is the process flow diagram of method of the present invention;
Fig. 5 is the anodal and anodal directly looped network circuit diagrams of two groups of straight-flow systems;
Fig. 6 is two groups of straight-flow system negative poles and the direct looped network circuit diagram of negative pole;
Fig. 7 is the positive pole of first group of straight-flow system and the direct looped network circuit diagram of the negative pole of second group of straight-flow system of two groups of straight-flow system looped networks;
Fig. 8 is that the positive pole of first group of straight-flow system and the negative pole of second group of straight-flow system of two groups of straight-flow system looped networks passes through certain electrical equipment looped network circuit diagram;
Fig. 9 is the anodal and anodal directly equivalent circuit diagrams of looped network of two groups of straight-flow systems;
Figure 10 is the equivalent circuit diagram of two groups of straight-flow system negative poles and the direct looped network of negative pole;
Figure 11 is the equivalent circuit diagram of the positive pole of first group of straight-flow system and the direct looped network of negative pole of second group of straight-flow system;
Figure 12 is that the positive pole of first group of straight-flow system and the negative pole of second group of straight-flow system pass through the equivalent circuit diagram of certain electrical equipment looped network.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, the present invention is described in more detail.
Fig. 1 is the theory diagram of device of the present invention.As shown in Figure 1: the first balanced bridge unit is connected between first group of DC bus positive pole and first group of DC bus negative pole, and is connected with one end of the first ground connection control module, and the other end of the first ground connection control module is connected with the earth; The second balanced bridge unit is connected between second group of DC bus positive pole and second group of DC bus negative pole, and is connected with one end of the second ground connection control module, and the other end of the second ground connection control module is connected with the earth.The first voltage acquisition unit is connected in first group of DC bus, gathers the anodal voltage-to-ground of first group of DC bus and negative pole voltage-to-ground; Second voltage collecting unit is connected in second group of direct current, gathers the anodal voltage-to-ground of second group of DC bus and negative pole voltage-to-ground; The voltage that two voltage acquisition units gather is all given processor, anodal voltage-to-ground and the negative pole voltage-to-ground of two groups of DC buss that processor collects two voltage acquisition units are processed, and two ground connection control modules are controlled, determine as required whether voltage acquisition unit accesses the earth.
Fig. 2 is the schematic diagram of the embodiment 1 of device of the present invention.As shown in Figure 2, the first balanced bridge unit is comprised of balance resistance R1 and R2, the first ground connection control module consists of K switch 1, one end of balance resistance R1 is connected to the anodal KM1+ of first group of DC bus, the other end is connected with balance resistance R2, grounding switch K1, the other end of balance resistance R2 is connected with first group of DC bus negative pole KM1-, and the other end of grounding switch K1 is connected with the earth; One end of balance resistance R3 is connected to the anodal KM2+ of first group of DC bus, and the other end is connected with balance resistance R4, grounding switch K2, and the other end of balance resistance R4 is connected with first group of DC bus negative pole KM2-, and the other end of grounding switch K2 is connected with the earth.Grounding switch K1 and grounding switch K2 can be controlled mechanical switch, as relay, can be also controlled electronic switchs, as power electronic devices, electronic relay etc.
The first voltage acquisition unit is the first balanced bridge unit, the first voltage acquisition unit gathers the anodal voltage-to-ground of first group of DC bus and negative pole voltage-to-ground by the first balanced bridge unit, the voltage signal that the first voltage acquisition unit gathers is after the conditioning of the first sampled signal conditioning unit, give AD converter, AD converter is converted to digital signal by the simulating signal of input, give processor, the digital value that processor is sent into according to AD converter is calculated, and obtains the anodal voltage-to-ground U of first group of DC bus
1+with negative pole voltage-to-ground U
1-; In like manner, second voltage collecting unit is the second balanced bridge unit, second voltage collecting unit gathers the anodal voltage-to-ground of second group of DC bus and negative pole voltage-to-ground by the second balanced bridge unit, the voltage signal that second voltage collecting unit gathers is after the conditioning of the second sampled signal conditioning unit, give AD converter, AD converter is converted to digital signal by the simulating signal of input, give processor, the digital value that processor is sent into according to AD converter is calculated, and obtains the anodal voltage-to-ground U of second group of DC bus
2+with negative pole voltage-to-ground U
2-.
AD converter can be independently, also can be integrated in processor.
Above-mentioned sampled signal conditioning unit is generally comprised of circuit modules such as isolation, amplification, filtering, the voltage signal of being exported by balanced bridge carries out signal isolation through linear isolation device, typical linear isolation device has isolation operational amplifier, linear optical coupling etc., also can adopt integrated isolated form voltage transformation module; Voltage signal through isolation need to amplify, to adapt to the input requirements of AD converter; Meanwhile, filtering circuit filtering is set and is coupling in the undesired signal on voltage signal.
Fig. 3 is the schematic diagram of the embodiment 2 of device of the present invention, and in this embodiment, the structure of balanced bridge unit and ground connection control module is consistent with embodiment 1.That set voltage acquisition unit is for measuring the device of the anodal voltage-to-ground of DC bus and DC bus negative pole voltage-to-ground, as instrument, D.C. isolation monitoring device, DC voltage monitoring device etc. with embodiment 1 difference.At least 1 voltage measuring apparatus is all set in first group of DC bus and second group of DC bus, wherein the first voltage measuring apparatus is connected in first group of DC bus positive pole, negative pole and the earth, measures the anodal voltage-to-ground of first group of DC bus and negative pole voltage-to-ground; Second voltage measurement mechanism is connected in second group of DC bus positive pole, negative pole and the earth, measures the anodal voltage-to-ground of second group of DC bus and negative pole voltage-to-ground.The magnitude of voltage that two voltage measuring apparatus are surveyed passes to processor by communicating circuit.
Fig. 4 is the process flow diagram of method of the present invention, and its course of work is:
1, measure the anodal voltage-to-ground U of first group of DC bus
1+, first group of DC bus negative pole voltage-to-ground U
1-with the anodal voltage-to-ground U of second group of DC bus
2+, second group of DC bus negative pole voltage-to-ground U
2-;
2, two groups of DC bus both positive and negative polarity voltage-to-ground values are made the following judgment:
If a) U
1+=U
2+, disconnect the grounding switch K1 of first group of DC bus or the grounding switch K2 of second group of DC bus, and gather U
1+, U
1-, U
2+, U
2-if still there is U
1+=U
2+, can be judged to be two groups of straight-flow system looped networks, looped network character is anodal directly looped network;
B) if U
1-=U
2-, disconnect the grounding switch K1 of first group of DC bus or the grounding switch K2 of second group of DC bus, and gather U
1+, U
1-, U
2+, U
2-if still there is U
1-=U
2-, can be judged to be two groups of straight-flow system looped networks, looped network character is the direct looped network of negative pole;
C) if U
1+=U
2-, disconnect the grounding switch K1 of first group of DC bus or the grounding switch K2 of second group of DC bus, and gather U
1+, U
1-, U
2+, U
2-if still there is U
1+=U
2-, can be judged to be two groups of straight-flow system looped networks, looped network character is first group of straight-flow system positive pole and second group of direct looped network of straight-flow system negative pole;
D) if U
1-=U
2+, disconnect the grounding switch K1 of first group of DC bus or the grounding switch K2 of second group of DC bus, and gather U
1+, U
1-, U
2+, U
2-if still there is U
1-=U
2+, can be judged to be two groups of straight-flow system looped networks, looped network character is first group of straight-flow system negative pole and second group of anodal directly looped network of straight-flow system;
3, regularly make the following judgment:
Disconnect the grounding switch K1 of first group of DC bus, gather second group of DC bus both positive and negative polarity voltage-to-ground U
2+, U
2-, with the second group of DC bus both positive and negative polarity voltage-to-ground U disconnecting before K1
2+, U
2-relatively, if there is significant change, be judged to be two groups of straight-flow system looped networks; Or the grounding switch K2 of second group of DC bus of disconnection, gather first group of DC bus both positive and negative polarity voltage-to-ground U
1+, U
1-, with the first group of DC bus both positive and negative polarity voltage-to-ground U disconnecting before K2
1+, U
1-relatively, if there is significant change, be judged to be two groups of straight-flow system looped networks.
Said apparatus and square ratio juris are as follows:
Fig. 5～Fig. 8 is straight-flow system looped network circuit diagram; wherein; Figure 5 shows that the anodal and anodal directly looped network of two groups of straight-flow systems; Figure 6 shows that two groups of straight-flow system negative poles and the direct looped network of negative pole; Figure 7 shows that first group of straight-flow system positive pole and second group of direct looped network of straight-flow system negative pole, Figure 8 shows that first group of straight-flow system positive pole passes through electrical equipment looped network with second group of straight-flow system negative pole, in straight-flow system; this electrical equipment is relay protection coil, has certain resistance.In above-mentioned four figure, E1 is the busbar voltage of first group of straight-flow system, and KM1+, KM1-are the positive and negative busbar of first group of straight-flow system, R
p1for being connected to the balance resistance of first group of insulation monitoring and warning device on DC bus, R
p1be connected to DC bus positive pole over the ground between and negative pole over the ground between, R
1+, R
1-be respectively the resistance value of the anodal insulation against ground decline of first group of straight-flow system and the resistance value that negative pole insulation against ground declines; E2 is the busbar voltage of second group of straight-flow system, and KM2+, KM2-are the positive and negative busbar of second group of straight-flow system, R
p2for being connected to the balance resistance of second group of insulation monitoring and warning device on DC bus, R
p2be connected to DC bus positive pole over the ground between and negative pole over the ground between, R
2+, R
2-be respectively the resistance value of the anodal insulation against ground decline of second group of straight-flow system and the resistance value that negative pole insulation against ground declines.General, in same transformer station or generating plant, the magnitude of voltage of two groups of DC buss is equal, i.e. E1=E2.
For the ease of the voltage occurring after looped network is analyzed, the circuit equivalent shown in Fig. 5～Fig. 8 is reduced to circuit shown in Fig. 9～Figure 12, wherein: R
1=R
1+//R
p1, R
2=R
1-//R
p1, R
3=R
2+//R
p2, R
4=R
2-//R
p2.
U
1+be the anodal voltage-to-ground value of first group of straight-flow system, U
1-be first group of straight-flow system negative pole voltage-to-ground value, U
2+be the anodal voltage-to-ground value of second group of straight-flow system, U
2-be second group of straight-flow system negative pole voltage-to-ground value.
Below in conjunction with Fig. 9～Figure 12, looped network circuit is analyzed:
Circuit shown in Fig. 9 is the positive pole and anodal directly looped network of two groups of straight-flow systems, and as seen from the figure, the anodal KM1+ of first group of straight-flow system and the anodal KM2+ of second group of straight-flow system such as are at the site, resistance R
1and R
3be connected across between these sites and the earth, so there is U
1+=U
2+.But, U
1+=U
2+also may cause because straight-flow system insulation declines, so, need to disconnect earth point and further judge, if because looped network causes, after disconnecting K1, still there is U
1+=U
2+otherwise,, if cause because insulation declines, U
1+≠ U
2+.The negative pole of two groups of straight-flow systems shown in Figure 10 and the direct looped network of negative pole, and first group of straight-flow system shown in Figure 11 is anodal and second group of direct looped network of straight-flow system negative pole, its principle is identical.
Circuit shown in Figure 12 is that first group of straight-flow system positive pole passes through electrical equipment looped network with second group of straight-flow system negative pole, and the resistance of establishing this electrical equipment is R
h, for the ease of analyzing, the voltage of establishing two groups of straight-flow systems is identical, i.e. E
1=E
2=E, after there is looped network, can show that two groups of straight-flow system both positive and negative polarity voltage-to-ground values are:
In formula, G
1, G
2, G
3, G
4, G
hbe respectively R
1, R
2, R
3, R
4, R
hinverse, i.e. electric conductivity value.Can find out, looped network must cause the variation of two groups of straight-flow systems positive poles and negative pole voltage-to-ground, in order to distinguish change in voltage, be by insulating that decline causes or caused by looped network, can disconnect the grounding switch K1 of first group of DC bus, gathering second group of DC bus both positive and negative polarity voltage-to-ground U
2+, U
2-, with the second group of DC bus both positive and negative polarity voltage-to-ground U disconnecting before K1
2+, U
2-relatively, if there is significant change, be judged to be two groups of straight-flow system looped networks, otherwise if without significant change, there is not looped network in two groups of straight-flow systems; Or the grounding switch K2 of second group of DC bus of disconnection, gather first group of DC bus both positive and negative polarity voltage-to-ground U
1+, U
1-, with the first group of DC bus both positive and negative polarity voltage-to-ground U disconnecting before K2
1+, U
1-relatively, if there is significant change, be judged to be two groups of straight-flow system looped networks, otherwise if without significant change, there is not looped network in two groups of straight-flow systems.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect have been carried out to further detailed description; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. a pick-up unit for DC power-supply system looped network of DC power fault, is arranged on and is provided with two groups each other in the direct supply controller switching equipment of the accumulator of redundancy, it is characterized in that, described pick-up unit comprises:
Two balanced bridge unit, one of them balanced bridge unit is connected between first group of DC bus positive pole and first group of DC bus negative pole of DC power-supply system, and another balanced bridge unit is connected between second group of DC bus positive pole and second group of DC bus negative pole of DC power-supply system;
Two voltage acquisition units, one of them voltage acquisition unit is connected in first group of DC bus, gathers the anodal voltage-to-ground of first group of DC bus and negative pole voltage-to-ground; Another voltage acquisition unit is connected in second group of direct current, gathers the anodal voltage-to-ground of second group of DC bus and negative pole voltage-to-ground;
Two ground connection control modules, one of them ground connection control module is connected between the balanced bridge unit and the earth of first group of DC bus, and another ground connection control module is connected between the balanced bridge unit and the earth of second group of DC bus;
At least one processor, described processor is processed for anodal voltage-to-ground and the negative pole voltage-to-ground of two groups of DC buss that described two voltage acquisition units are collected, and for controlling whether ground connection of described ground connection control module.
2. the pick-up unit of looped network of DC power fault according to claim 1, is characterized in that, described ground connection control module at least comprises a grounding switch, and the folding condition of this grounding switch is controlled by described processor.
3. the pick-up unit of looped network of DC power fault according to claim 2, is characterized in that, described grounding switch is controlled mechanical relay or controlled electronic relay.
4. the pick-up unit of the looped network of DC power fault described in one of them according to claim 1-3, it is characterized in that, described balanced bridge unit comprises the equal balance resistance of at least two group resistances, every group of balance resistance at least comprises a balance resistance, wherein, one group of balance resistance is connected between DC bus positive pole and grounding switch, and another group balance resistance is connected between DC bus negative pole and grounding switch.
5. the pick-up unit of looped network of DC power fault according to claim 4, it is characterized in that, described balanced bridge unit gathers anodal voltage-to-ground and the negative pole voltage-to-ground of bus as described voltage acquisition unit, the voltage signal gathering carries out signal condition through a sampled signal conditioning unit, give an AD converter, described AD converter is converted to digital signal by the simulating signal of input, gives described processor.
6. the pick-up unit of looped network of DC power fault according to claim 5, is characterized in that, described AD converter can be independently, also can be integrated in processor; Described sampled signal conditioning unit is comprised of linear isolation, amplification or filter circuit module; Described circuit linearity insulating circuit module comprises isolation operational amplifier, linear optical coupling or integrated isolated form voltage transformation module, and the voltage signal of balanced bridge unit output is carried out to signal isolation; Described amplifying circuit module is amplified the voltage signal of isolation, to adapt to the input requirements of AD converter; Described filter circuit module filtering is coupling in the undesired signal on voltage signal.
7. the pick-up unit of the looped network of DC power fault described in one of them according to claim 1-3, it is characterized in that, described voltage acquisition unit is for measuring one of instrument, voltage monitor or D.C. isolation monitoring device of the anodal voltage-to-ground of DC bus and DC bus negative pole voltage-to-ground; Described processor is connected with described voltage acquisition unit by communicating circuit, obtains the anodal voltage-to-ground value of DC bus and DC bus negative pole voltage-to-ground value.
8. a detection method for DC power-supply system looped network of DC power fault, is characterized in that comprising step:
1) measure the anodal voltage-to-ground U of first group of DC bus
1+, first group of DC bus negative pole voltage-to-ground U
1-, second group of anodal voltage-to-ground U of DC bus
2+with second group of DC bus negative pole voltage-to-ground U
2-;
2) above-mentioned two groups of DC bus both positive and negative polarity voltage-to-ground values are made the following judgment:
If a) U
1+=U
2+, disconnect the grounding switch K1 of first group of DC bus or the grounding switch K2 of second group of DC bus, and gather U
1+, U
1-, U
2+, U
2-if still there is U
1+=U
2+, can be judged to be two groups of straight-flow system looped networks, looped network character is anodal directly looped network;
B) if U
1-=U
2-, disconnect the grounding switch K1 of first group of DC bus or the grounding switch K2 of second group of DC bus, and gather U
1+, U
1-, U
2+, U
2-if still there is U
1-=U
2-, can be judged to be two groups of straight-flow system looped networks, looped network character is the direct looped network of negative pole;
C) if U
1+=U
2-, disconnect the grounding switch K1 of first group of DC bus or the grounding switch K2 of second group of DC bus, and gather U
1+, U
1-, U
2+, U
2-if still there is U
1+=U
2-, can be judged to be two groups of straight-flow system looped networks, looped network character is first group of straight-flow system positive pole and second group of direct looped network of straight-flow system negative pole;
D) if U
1-=U
2+, disconnect the grounding switch K1 of first group of DC bus or the grounding switch K2 of second group of DC bus, and gather U
1+, U
1-, U
2+, U
2-if still there is U
1-=U
2+, can be judged to be two groups of straight-flow system looped networks, looped network character is first group of straight-flow system negative pole and second group of anodal directly looped network of straight-flow system;
3) regularly make the following judgment:
Disconnect the grounding switch K1 of first group of DC bus, gather second group of DC bus both positive and negative polarity voltage-to-ground U
2+, U
2-, with the second group of DC bus both positive and negative polarity voltage-to-ground U disconnecting before K1
2+, U
2-relatively, if there is significant change, be judged to be two groups of straight-flow system looped networks.
9. detection method according to claim 8, is characterized in that, in step 3, can also disconnect the grounding switch K2 of second group of DC bus, gathers first group of DC bus both positive and negative polarity voltage-to-ground U
1+, U
1-, with the first group of DC bus both positive and negative polarity voltage-to-ground U disconnecting before K2
1+, U
1-relatively, if there is significant change, be judged to be two groups of straight-flow system looped networks.
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