WO2015165314A1 - 一种漏电流检测电路、直流高压系统、检测方法和装置 - Google Patents

一种漏电流检测电路、直流高压系统、检测方法和装置 Download PDF

Info

Publication number
WO2015165314A1
WO2015165314A1 PCT/CN2015/075032 CN2015075032W WO2015165314A1 WO 2015165314 A1 WO2015165314 A1 WO 2015165314A1 CN 2015075032 W CN2015075032 W CN 2015075032W WO 2015165314 A1 WO2015165314 A1 WO 2015165314A1
Authority
WO
WIPO (PCT)
Prior art keywords
resistor
current flowing
current
bus
circuit
Prior art date
Application number
PCT/CN2015/075032
Other languages
English (en)
French (fr)
Inventor
杨靖
张宗望
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP15785269.0A priority Critical patent/EP3130931B1/en
Publication of WO2015165314A1 publication Critical patent/WO2015165314A1/zh
Priority to US15/339,117 priority patent/US10168376B2/en

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/10—Measuring sum, difference or ratio
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
    • G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only

Definitions

  • the present invention relates to the field of power electronics, and in particular, to a leakage current detecting circuit, a DC high voltage system, a leakage current detecting method and device.
  • leakage current detection is an indispensable part of insulation detection.
  • the common method of leakage current detection is sensor detection method; sensor detection method uses electromagnetic induction principle to pass Sensor detection (such as Hall sensor), the specific method is to use a sensor to simultaneously detect the current flowing through the positive and negative busbars.
  • Sensor detection such as Hall sensor
  • the specific method is to use a sensor to simultaneously detect the current flowing through the positive and negative busbars.
  • the sensor detection method detects the leakage current value by detecting the current difference between the positive and negative bus bars, and uses the electromagnetic conversion of the sensor to calculate the leakage current value.
  • a sensor has high manufacturing cost, low sensitivity, and the leakage current value is relatively small to be detected; and the sensor is sensitive to the magnetic field. When used in an environment with high interference intensity, it is prone to false alarms police.
  • the current block diagram of leakage current detection is shown in Figure 1. It mainly includes battery, rectifier module 11, load 12 and sensor 13. Both positive and negative busbars pass through sensor 13, and then supply power to load 12. Under normal circumstances, the system insulation is normal. No leakage current, the positive bus current I1 and the negative bus current I4 are equal in magnitude and opposite directions. At this time, the magnetic fields generated by I1 and I4 in the sensor cancel each other out, and the output of the sensor 13 is 0; when the system has an insulation fault, leakage occurs. For example, taking the positive bus insulation fault as an example, let the leakage current be I2 (R in is the equivalent ground resistance), then the I1 size is equal to I2 plus I3, and the magnetic field flowing through the sensor 13 is not 0, passing the detection sensor.
  • the output voltage can calculate the leakage current; the existing leakage current detection technology uses the electromagnetic principle to detect the leakage current. Because the sensor detects small signals, the sensitivity is low, and because the sensor is sensitive to the magnetic field, when used in interference In a strong environment, false alarms are prone to occur, resulting in reduced system reliability.
  • the existing leakage current detection technology uses the electromagnetic principle to detect the leakage current, and the sensitivity of the sensor for detecting the magnetic field is low, so when the leakage current is small, the sensor is difficult to detect the leakage current, and when the magnetic field is detected, the sensor When applied in an environment with large magnetic field interference, false alarms are prone to occur, thereby reducing system reliability.
  • the embodiment of the invention provides a leakage current detecting circuit, a high voltage direct current system, a leakage current detecting method and a device, which are used to solve the problem that the existing leakage current detecting technology has low sensitivity when the leakage current is small, and the sensor has low sensitivity, resulting in a sensor. It is difficult to detect leakage current, and when the sensor is applied in an environment with large magnetic field interference, it is prone to false alarms, thereby reducing the reliability of the system.
  • a leakage current detecting circuit including a first resistor on a positive DC bus, a second resistor on a negative DC bus, and a detection connected to the first resistor and the second resistor, respectively a processing circuit; wherein the first resistor and the second resistor are located in a trunk in a system comprising a positive DC bus, a negative DC bus, and a load, or in the same branch in the system;
  • the detection processing circuit is configured to detect a current flowing through the first resistor, and detect a current flowing through the second resistor, and determine a current flowing through the first resistor and flow through the second resistor The difference in current is the leakage current.
  • the detecting processing circuit is further configured to: when the leakage current is not equal to zero, determine that the system includes the load and is located in the first resistor An insulation fault occurs between the circuit and the second resistor; and when the leakage current is equal to zero, it is determined that the system is normally insulated.
  • the leakage current detecting circuit provided by the embodiment of the present invention further includes a third resistor on the positive DC bus and a fourth on the negative DC bus. a resistor, the detection processing circuit is respectively connected to the third resistor and the fourth resistor;
  • the detection processing circuit is further configured to detect a current flowing through the third resistor and detect a current flowing through the fourth resistor;
  • the third resistor and the fourth resistor are located in the same branch in the system when the first resistor and the second resistor are located in a trunk in the system; the detection processing circuit And determining, when the current flowing through the third resistor is not equal to the current flowing through the fourth resistor, determining a circuit including the load and located between the third resistor and the fourth resistor An insulation fault occurs, and the leakage current is the difference between the current flowing through the third resistor and the current flowing through the fourth resistor; and the current flowing through the third resistor is equal to flowing through the fourth a current of the resistor, and when a current flowing through the first resistor is not equal to a current flowing through the second resistor, determining an insulation fault of the positive DC bus between the first resistor and the third resistor, or An insulation fault occurs between a negative DC bus between the second resistor and the fourth resistor, or the system includes the load and is located in a circuit between the first resistor and the second resistor, In addition to the third resistor and the fourth resistor A circuit other than the circuit
  • the third resistor and the fourth resistor are located in a trunk in the system when the first resistor and the second resistor are located in the same branch in the system; the detection processing circuit And determining, when the current flowing through the first resistor is not equal to the current flowing through the second resistor, determining a circuit including the load and located between the first resistor and the second resistor An insulation fault occurs, and the leakage current is the difference between the current flowing through the first resistor and the current flowing through the second resistor; and the current flowing through the first resistor is equal to flowing through the second a current of the resistor, and a current flowing through the third resistor is not equal to a current flowing through the fourth resistor, determining an insulation fault of the positive DC bus between the first resistor and the third resistor, or An insulation fault occurs between a negative DC bus between the second resistor and the fourth resistor, or the circuit includes the load and is located in a circuit between the third resistor and the fourth resistor, In addition to the first resistor and the second resistor A circuit other than the circuit insulation
  • the detection processing circuit is further configured to: when a current flowing through the first resistor is equal to flowing through the second resistor The current, and the current flowing through the third resistor is equal to the current flowing through the fourth resistor, and it is determined that the system insulation is normal.
  • a DC high voltage system including a DC power supply, a positive DC bus, a negative DC bus, a rectifier module, a load, and a leakage current detecting circuit provided by the embodiment of the present invention.
  • a leakage current detecting method including:
  • the first resistor is on a positive DC bus
  • the second resistor is on a negative DC bus
  • the first resistor and the second resistor are located in a system including a positive DC bus, a negative DC bus, and a load. In the trunk, or in the same branch in the system.
  • the method further includes:
  • the method further includes:
  • the third resistor is on the positive DC bus and the fourth resistor is on the negative DC bus;
  • the third resistor and the fourth resistor are located in the same branch in the system
  • a current flowing through the third resistor is equal to a current flowing through the fourth resistor, and flows through the
  • the current of the first resistor is not equal to the current flowing through the second resistor, determining that the positive DC bus between the first resistor and the third resistor is insulated, or the second resistor and the second An insulation fault occurs between a negative DC bus between the four resistors, or the circuit includes the load and is located in a circuit between the first resistor and the second resistor, except at the third resistor and An insulation fault occurs in a circuit other than the circuit between the fourth resistors, and the leakage current is a difference between a current flowing through the first resistor and a current flowing through the second resistor;
  • the third resistor and the fourth resistor are located in a trunk in the system
  • the method further includes:
  • a leakage current detecting apparatus including:
  • a detecting module for detecting a current flowing through the first resistor and detecting a current flowing through the second resistor
  • the first resistor is on a positive DC bus
  • the second resistor is on a negative DC bus
  • the first resistor and the second resistor are located in a system including a positive DC bus, a negative DC bus, and a load. In the trunk, or in the same branch in the system.
  • the determining module is further configured to:
  • the detecting module is further configured to:
  • the third resistor is on the positive DC bus and the fourth resistor is on the negative DC bus;
  • the third resistor and the fourth resistor are located in the same branch in the system; For determining that a circuit including the load and located between the third resistor and the fourth resistor occurs when a current flowing through the third resistor is not equal to a current flowing through the fourth resistor An insulation fault, and the leakage current is a difference between a current flowing through the third resistor and a current flowing through the fourth resistor; and a current flowing through the third resistor is equal to flowing through the fourth resistor a current, and a current flowing through the first resistor is not equal to a current flowing through the second resistor, determining an insulation fault of the positive DC bus between the first resistor and the third resistor, or An insulation fault occurs between a negative DC bus between the second resistor and the fourth resistor, or the circuit includes the load and is located in a circuit between the first resistor and the second resistor, except Located between the third resistor and the fourth resistor Circuit path other than the occurrence of
  • the third resistor and the fourth resistor are located in a trunk in the system; Used for: When a current flowing through the first resistor is not equal to a current flowing through the second resistor, determining an insulation fault including a circuit including the load and located between the first resistor and the second resistor, And the leakage current is a difference between a current flowing through the first resistor and a current flowing through the second resistor; and a current flowing through the first resistor is equal to a current flowing through the second resistor, And determining, when the current flowing through the third resistor is not equal to the current flowing through the fourth resistor, determining an insulation fault of the positive DC bus between the first resistor and the third resistor, or the second An insulation fault occurs between the resistor and the negative DC bus between the fourth resistor, or the circuit includes the load and is located in a circuit between the third resistor and the fourth resistor, except in the An insulation fault occurs in a circuit other than the circuit between the first
  • the determining module is further configured to:
  • the leakage current detecting circuit, the high voltage direct current system, the leakage current detecting method and the device provided by the embodiment of the invention can detect the current flowing through the first resistor located on the positive DC bus and can be detected on the negative DC bus. a current on the second resistor, and determining a difference between a current flowing through the first resistor and a current flowing through the second resistor as a leakage current, wherein the first resistor and the second resistor may be located
  • the trunk circuit in the system of the positive DC bus, the negative DC bus, and the load may also be located in the same branch in the system. Therefore, the leakage current detecting circuit, the high voltage DC system, and the leakage current detection provided by the embodiments of the present invention are used.
  • the method and the device can avoid the detection of the leakage current by the sensor for detecting the magnetic field, because the sensitivity of the sensor for detecting the magnetic field is low, the sensitivity of the leakage current detection is low, and the detection of the leakage current by the sensor for detecting the magnetic field can be avoided, It is susceptible to interference from environmental magnetic fields, resulting in reduced system reliability.
  • FIG. 1 is a schematic structural diagram of a circuit for detecting leakage current in the prior art
  • 2a is a schematic structural diagram of a leakage current detecting circuit and a high voltage direct current system according to an embodiment of the present invention
  • 2b is a second schematic structural diagram of a leakage current detecting circuit and a high voltage direct current system according to an embodiment of the present invention
  • 3a is a third schematic structural diagram of a leakage current detecting circuit and a high voltage direct current system according to an embodiment of the present invention
  • 3b is a fourth schematic structural diagram of a leakage current detecting circuit and a high voltage direct current system according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a leakage current detecting method according to an embodiment of the present invention.
  • FIG. 5 is a second flowchart of a leakage current detecting method according to an embodiment of the present disclosure
  • 6a is a third flowchart of a leakage current detecting method according to an embodiment of the present invention.
  • 6b is a fourth flowchart of a leakage current detecting method according to an embodiment of the present invention.
  • FIG. 7 is a structural diagram of a leakage current detecting apparatus according to an embodiment of the present invention.
  • the leakage current detecting circuit, the high voltage direct current system, the leakage current detecting method and the device provided by the embodiment of the invention can detect the current flowing through the first resistor located on the positive DC bus and can be detected on the negative DC bus. a current on the second resistor, and determining a difference between a current flowing through the first resistor and a current flowing through the second resistor as a leakage current, wherein the first resistor and the second resistor may be located In the trunk of the system with positive DC bus, negative DC bus and load, it can also be located in the same branch of the system, which avoids the use of sensors that detect magnetic fields to detect leakage current, thus avoiding the use of this The shortcomings of the sensor.
  • a leakage current detecting circuit includes a first resistor R1 on the positive DC bus BUS+, a second resistor R2 on the negative DC bus BUS-, and respectively a detection processing circuit 21 connected to the first resistor R1 and the second resistor R2; wherein, in FIG. 2a, the first resistor R1 and the second resistor R2 are located in a system including a positive DC bus BUS+, a negative DC bus BUS-, and a load 12.
  • the first resistor R1 and the second resistor R2 are located in the same branch of the system; in Figures 2a and 2b, the system also includes a DC power source DC; In Fig. 2b, the two parallel loads 12 are taken as an example for description. In practice, multiple loads may be connected in parallel.
  • the detection processing circuit 21 is configured to detect the current I1 flowing through the first resistor R1, detect the current I2 flowing through the second resistor R2, and determine the current I1 flowing through the first resistor R1 and the current flowing through the second resistor R2.
  • the difference between I2, that is, I1-I2 is the leakage current.
  • the detection processing circuit 21 detects the current flowing through a resistor, and can first detect the voltage across the resistor, and then uses Ohm's law to calculate the current flowing through the resistor according to the voltage across the resistor and the resistance of the resistor.
  • the detection processing circuit 21 is further configured to determine, when the determined leakage current, that is, I1-I2 is not equal to zero, a circuit including the load 12 in the system and located between the first resistor R1 and the second resistor R2 (ie, An insulation fault occurs in the circuit along the broken line portion of Fig. 2a or the circuit along the broken line portion in Fig. 2b; and when the leakage current, i.e., I1-I2, is equal to zero, it is determined that the insulation of the system is normal.
  • the leakage current detecting circuit provided by the embodiment of the present invention, as shown in FIG. 3a or FIG. 3b, further includes a third resistor R3 on the positive DC bus BUS+ and a fourth resistor R4 on the negative DC bus BUS-.
  • the detection processing circuit 21 is connected to the third resistor R3 and the fourth resistor R4, respectively;
  • the detection processing circuit 21 is further configured to detect a current flowing through the third resistor R3 and detect a current flowing through the fourth resistor R4;
  • the first resistor R1 and the second resistor R2 are located in a trunk circuit in a system including a positive DC bus BUS+, a negative DC bus BUS-, and a load 12, and the third resistor R3 and the fourth resistor R4 are located in the system. In the same branch;
  • the detection processing circuit 21 is also used to vary the current I3 flowing through the third resistor R3.
  • the circuit including the load 12 and located between the third resistor R3 and the fourth resistor R4 ie, the circuit along the broken line portion in FIG. 3a
  • the leakage current The difference between the current I3 flowing through the third resistor R3 and the current I4 flowing through the fourth resistor R4, that is, I3-I4; and the current I3 flowing through the third resistor R3 is equal to the current flowing through the fourth resistor R4.
  • the system includes a load 12 and is located in a circuit between the first resistor R1 and the second resistor R2, except at the third resistor R3 and An insulation fault occurs in a circuit other than the circuit between the fourth resistor R4 (ie, the branch where the load 12 on the left side of the two loads 12 in FIG. 3a is located), and the leakage current is the current I1 flowing through the first resistor R1.
  • the first resistor R1 and the second resistor R2 are located in the same branch in the system including the positive DC bus BUS+, the negative DC bus BUS-, and the load 12, and the third resistor R3 and the fourth resistor R4 are located in the same branch.
  • the trunk road of the system In the trunk road of the system;
  • the detection processing circuit 21 is further configured to determine that the load 12 is included and is located at the first resistor R1 and the second when the current I1 flowing through the first resistor R1 is not equal to the current I2 flowing through the second resistor R2. An insulation fault occurs in the circuit between the resistors R2 (the circuit along the broken line portion in FIG.
  • the leakage current is the difference between the current I1 flowing through the first resistor R1 and the current I2 flowing through the second resistor R2;
  • the current I1 flowing through the first resistor R1 is equal to the current I2 flowing through the second resistor R2, and the current I3 flowing through the third resistor R3 is not equal to the current I4 flowing through the fourth resistor R4, determining the first resistor R1 and the first An insulation fault occurs in the positive DC bus BUS+ between the three resistors R3, or an insulation fault occurs in the negative DC bus BUS- between the second resistor R2 and the fourth resistor R4, or the system includes a load 12 and is located at the third resistor R3.
  • the detection processing circuit 21 is further configured to flow the current I1 flowing through the first resistor R1 to be equal to When the current I2 of the second resistor R2 and the current I3 flowing through the third resistor R3 are equal to the current I4 flowing through the fourth resistor R4, it is determined that the positive DC bus BUS+, the negative DC bus BUS-, the DC power supply DC, and the load 12 are included. The system insulation is normal.
  • the fault point range can be narrowed and the maintenance range can be quickly located.
  • the system may include n (n is greater than or equal to 2) parallel loads.
  • the positive DC bus of the system has N-1 third resistors
  • the system has n-1 fourth resistors on the negative DC bus
  • each of the two third resistors is located on both sides of at least one load
  • each of the two fourth resistors is located at least one load
  • the DC high voltage system provided by the embodiment of the present invention, as shown in FIG. 2a, FIG. 2b, FIG. 3a or FIG. 3b, includes a DC power supply DC, a positive DC bus BUS+, a negative DC bus BUS-, a rectifier module 11, a load 12, and the implementation of the present invention.
  • the leakage current detection circuit provided by the example.
  • a leakage current detecting method is applied to the circuit shown in FIG. 2a or 2b, and the method includes:
  • S402. Determine a difference between a current flowing through the first resistor and a current flowing through the second resistor as a leakage current
  • the first resistor is on a positive DC bus
  • the second resistor is on a negative DC bus
  • the first resistor and the second resistor are located in a system including a positive DC bus, a negative DC bus, and a load. In the trunk, or in the same branch in the system.
  • the leakage current detecting method provided by the embodiment of the present invention is as shown in FIG. 5, and further includes:
  • the leakage current detecting method provided by the embodiment of the present invention is applied to FIG. 3a as shown in FIG. 6a.
  • the leakage current detecting circuit shown that is, the first resistor and the third resistor are both located on a positive DC bus, the second resistor and the fourth resistor are both located on a negative DC bus; and the first A resistor and the second resistor are located in a trunk of the system, the third resistor and the fourth resistor being located in the same branch of the system; the method comprising:
  • the leakage current detecting method provided by the embodiment of the present invention is applied to the leakage current detecting circuit shown in FIG. 3b, as shown in FIG. 6b, that is, the first resistor and the third resistor are both located on the positive DC bus.
  • the second resistor and the fourth resistor are both located on a negative DC bus; and the first resistor and the second resistor are located in the same branch in the system, the third resistor and the A fourth resistor is located in the trunk of the system; the method includes:
  • the above-mentioned detection of the current flowing through a resistor can first detect the voltage across the resistor, and then use Ohm's law to calculate the current flowing through the resistor based on the voltage across the resistor and the resistance of the resistor.
  • the embodiment of the present invention further provides a leakage current detecting device. Since the principle of solving the problem is similar to the foregoing leakage current detecting method, the implementation of the device can be referred to the implementation of the foregoing method, and the repetition is performed. No longer.
  • the leakage current detecting device provided by the embodiment of the present invention, as shown in FIG. 7, includes:
  • a detecting module 71 configured to detect a current flowing through the first resistor, and detect a current flowing through the second resistor
  • a determining module 72 configured to determine that a difference between a current flowing through the first resistor and a current flowing through the second resistor is a leakage current
  • the first resistor is on a positive DC bus
  • the second resistor is on a negative DC bus
  • the first resistor and the second resistor are located in a system including a positive DC bus, a negative DC bus, and a load. In the trunk, or in the same branch in the system.
  • the determining module 72 is further configured to: when the leakage current is not equal to zero, determine that the circuit including the load in the system and the circuit between the first resistor and the second resistor is insulated When the leakage current is equal to zero, it is determined that the system insulation is normal.
  • the detecting module 71 is further configured to: detect a current flowing through the third resistor, and detect a current flowing through the fourth resistor;
  • the third resistor is on the positive DC bus and the fourth resistor is on the negative DC bus;
  • the determining module 72 is further used After the current flowing through the third resistor is not equal to the current flowing through the fourth resistor, determining that the circuit including the load and between the third resistor and the fourth resistor is insulated a fault, and the leakage current is a difference between a current flowing through the third resistor and a current flowing through the fourth resistor; and a current flowing through the third resistor is equal to flowing through the fourth resistor And determining, when the current flowing through the first resistor is not equal to the current flowing through the second resistor, determining an insulation fault of the positive DC bus between the first resistor and the third resistor, or An insulation fault occurs between a negative DC bus between the second resistor and the fourth resistor, or the circuit includes the load and is located in a circuit between the first resistor and the second resistor, except Electricity between the third resistor and the fourth resistor Circuits other than
  • the third resistor and the fourth resistor are located in a trunk in the system; After the current flowing through the first resistor is not equal to the current flowing through the second resistor, determining that the circuit including the load and between the first resistor and the second resistor is insulated a fault, and the leakage current is the difference between the current flowing through the first resistor and the current flowing through the second resistor; The current flowing through the first resistor is equal to the current flowing through the second resistor, and the current flowing through the third resistor is not equal to the current flowing through the fourth resistor, determining the first resistance and An insulation fault occurs in a positive DC bus between the third resistors, or an insulation fault occurs in a negative DC bus between the second resistor and the fourth resistor, or the system includes the load and is located at the In the circuit between the third resistor and the fourth resistor, an insulation fault occurs in a circuit other than the circuit between the first resistor and the second resistor, and a leakage current
  • the determining module 72 is further configured to: the current flowing through the first resistor is equal to the current flowing through the second resistor, and the current flowing through the third resistor is equal to flowing through the fourth resistor
  • the current of the system including the positive DC bus, the negative DC bus, the DC power supply, and the load is determined to be normal.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the device is implemented in a flow chart or Multiple processes and/or block diagrams The functions specified in one or more boxes.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

一种漏电流检测电路、高压直流系统、漏电流检测方法和装置，用以提高漏电流检测的灵敏度和可靠性。该电路包括位于正直流母线（BUS+）上的第一电阻（R1），位于负直流母线（BUS-）上的第二电阻（R2），以及分别与所述第一电阻（R1）和所述第二电阻（R2）相连的检测处理电路（21）；其中，所述第一电阻（R1）和所述第二电阻（R2）位于包含正直流母线（BUS+）、负直流母线（BUS-）和负载（12）的系统中的干路中，或者位于所述系统中的同一支路中；所述检测处理电路（21），用于检测流过所述第一电阻（R1）的电流（I1），并检测流过所述第二电阻（R2）的电流（I2），以及确定流过所述第一电阻（R1）的电流（I1）与流过所述第二电阻（R2）的电流（I2）之差为漏电流。

Description

一种漏电流检测电路、直流高压系统、检测方法和装置
本申请要求在2014年4月29日提交中国专利局、申请号为201410178867.6、发明名称为“一种漏电流检测电路、直流高压系统、检测方法和装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及电力电子技术领域，尤其涉及一种漏电流检测电路、直流高压系统、漏电流检测方法和装置。
背景技术
在直流高压系统中，绝缘检测是必备功能，漏电流检测是绝缘检测中不可或缺的部分，现有技术中漏电流检测的通常做法为传感器检测法；传感器检测法利用电磁感应原理，通过传感器检测(如霍尔传感器)，具体方法是用一个传感器同时检测流过正负母线的电流，系统绝缘正常时，由于电流大小相等方向相反，此时通过传感器的磁场相互抵消，检测到的漏电流为0；当系统出现绝缘故障时，无论是正母线漏电或负母线漏电，此时流过传感器的电流大小不相等，所以磁场不为0，此时通过检测传感器输出电压信号即可计算出电流大小；传感器检测法通过检测正负母线上的电流差，利用传感器电磁转换计算出漏电流值，此类传感器制作成本高、灵敏度低，漏电流值比较小时无法检测；同时传感器对磁场敏感，当使用在干扰强度大的环境中时，容易出现误告警。
目前的漏电流检测原理框图如图1所示，主要包含电池、整流模块11、负载12和传感器13，正负母线都穿过传感器13，再给负载12供电，正常情况下，系统绝缘正常，无漏电，流过正母线电流I1和流过负母线电流I4大小相等，方向相反，此时传感器内由I1和I4产生的磁场相互抵消，传感器13输出为0；当系统出现绝缘故障，发生漏电时，以正母线绝缘故障为例，设漏电流为I2(Rin为等效的对地电阻)，则此时I1大小等于I2加I3，流过传感器13的磁场不为0，通过检测传感器输出电压即可计算出漏电流大小；现有漏 电流检测技术，利用电磁原理，采用传感器检测漏电流，由于传感器检测小信号能力差，因此灵敏度低，同时由于传感器对磁场敏感，当使用在干扰强度大的环境时，容易出现误告警，导致系统可靠性降低。
综上所述，现有的漏电流检测技术利用电磁原理检测漏电流，检测磁场的传感器的灵敏度较低，因此在漏电流较小时，传感器很难检测到漏电流，并且，当检测磁场的传感器应用在磁场干扰较大的环境中时，容易出现误告警，从而降低系统的可靠性。
发明内容
本发明实施例提供了一种漏电流检测电路、高压直流系统、漏电流检测方法和装置，用以解决现有漏电流检测技术在漏电流较小时，检测磁场的传感器的灵敏度较低，导致传感器很难检测到漏电流，并且当传感器应用在磁场干扰较大的环境中时，容易出现误告警，从而降低系统的可靠性的问题。
第一方面，提供一种漏电流检测电路，包括位于正直流母线上的第一电阻，位于负直流母线上的第二电阻，以及分别与所述第一电阻和所述第二电阻相连的检测处理电路；其中，所述第一电阻和所述第二电阻位于包含正直流母线、负直流母线和负载的系统中的干路中，或者位于所述系统中的同一支路中；
所述检测处理电路，用于检测流过所述第一电阻的电流，并检测流过所述第二电阻的电流，以及确定流过所述第一电阻的电流与流过所述第二电阻的电流之差为漏电流。
结合第一方面，在第一种可能的实现方式中，所述检测处理电路，还用于在所述漏电流不等于零时，确定所述系统中包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路发生绝缘故障；并在漏电流等于零时，确定所述系统绝缘正常。
结合第一方面，在第二种可能的实现方式中，本发明实施例提供的漏电流检测电路还包括位于正直流母线上的第三电阻和位于负直流母线上的第四 电阻，所述检测处理电路分别与所述第三电阻和所述第四电阻相连；
所述检测处理电路，还用于检测流过所述第三电阻的电流，并检测流过所述第四电阻的电流；
当所述第一电阻和所述第二电阻位于所述系统中的干路中时，所述第三电阻和所述第四电阻位于所述系统中的同一支路中；所述检测处理电路，还用于在流过所述第三电阻的电流不等于流过所述第四电阻的电流时，确定包括所述负载、且位于所述第三电阻和所述第四电阻之间的电路发生绝缘故障，且漏电流为流过所述第三电阻上的电流与流过所述第四电阻上的电流之差；并在流过所述第三电阻的电流等于流过所述第四电阻的电流，且流过所述第一电阻的电流不等于流过所述第二电阻的电流时，确定所述第一电阻与所述第三电阻之间的正直流母线发生绝缘故障，或者所述第二电阻与所述第四电阻之间的负直流母线发生绝缘故障，或者所述系统中包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路中，除位于所述第三电阻和所述第四电阻之间的电路以外的电路发生绝缘故障，且漏电流为流过所述第一电阻的电流与流过所述第二电阻的电流之差；
当所述第一电阻和所述第二电阻位于所述系统中的同一支路中时，所述第三电阻和所述第四电阻位于所述系统中的干路中；所述检测处理电路，还用于在流过所述第一电阻的电流不等于流过所述第二电阻的电流时，确定包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路发生绝缘故障，且漏电流为流过所述第一电阻上的电流与流过所述第二电阻上的电流之差；并在流过所述第一电阻的电流等于流过所述第二电阻的电流，且流过所述第三电阻的电流不等于流过所述第四电阻的电流时，确定所述第一电阻与所述第三电阻之间的正直流母线发生绝缘故障，或者所述第二电阻与所述第四电阻之间的负直流母线发生绝缘故障，或者所述系统中包括所述负载、且位于所述第三电阻和所述第四电阻之间的电路中，除位于所述第一电阻和所述第二电阻之间的电路以外的电路发生绝缘故障，且漏电流为流过所述第三电阻的电流与流过所述第四电阻的电流之差。
结合第一方面的第二种可能的实现方式，在第三种可能的实现方式中，所述检测处理电路还用于在流过所述第一电阻的电流等于流过所述第二电阻的电流，且流过所述第三电阻的电流等于流过所述第四电阻的电流时，确定包括所述系统绝缘正常。
第二方面，提供一种直流高压系统，包括直流电源、正直流母线、负直流母线、整流模块、负载和本发明实施例提供的漏电流检测电路。
第三方面，提供一种漏电流检测方法，包括：
检测流过第一电阻的电流，并检测流过第二电阻的电流；
确定流过第一电阻的电流与流过第二电阻的电流之差为漏电流；
其中，所述第一电阻位于正直流母线上，所述第二电阻位于负直流母线上，所述第一电阻和所述第二电阻位于包含正直流母线、负直流母线和负载的系统中的干路中，或者位于所述系统中的同一支路中。
结合第三方面，在第一种可能的实现方式中，所述方法还包括：
在所述漏电流不等于零时，确定所述系统中包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路发生绝缘故障；
在漏电流等于零时，确定所述系统绝缘正常。
结合第三方面，在第二种可能的实现方式中，所述方法还包括：
检测流过所述第三电阻的电流，并检测流过所述第四电阻的电流；
其中，所述第三电阻位于正直流母线上，所述第四电阻位于负直流母线上；
若所述第一电阻和所述第二电阻位于所述系统中的干路中，所述第三电阻和所述第四电阻位于所述系统中的同一支路中；
则在流过所述第三电阻的电流不等于流过所述第四电阻的电流时，确定包括所述负载、且位于所述第三电阻和所述第四电阻之间的电路发生绝缘故障，且漏电流为流过所述第三电阻上的电流与流过所述第四电阻上的电流之差；
在流过所述第三电阻的电流等于流过所述第四电阻的电流，且流过所述 第一电阻的电流不等于流过所述第二电阻的电流时，确定所述第一电阻与所述第三电阻之间的正直流母线发生绝缘故障，或者所述第二电阻与所述第四电阻之间的负直流母线发生绝缘故障，或者所述系统中包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路中，除位于所述第三电阻和所述第四电阻之间的电路以外的电路发生绝缘故障，且漏电流为流过所述第一电阻的电流与流过所述第二电阻的电流之差；
若所述第一电阻和所述第二电阻位于所述系统中的同一支路中，所述第三电阻和所述第四电阻位于所述系统中的干路中；
则在流过所述第一电阻的电流不等于流过所述第二电阻的电流时，确定包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路发生绝缘故障，且漏电流为流过所述第一电阻上的电流与流过所述第二电阻上的电流之差；
在流过所述第一电阻的电流等于流过所述第二电阻的电流，且流过所述第三电阻的电流不等于流过所述第四电阻的电流时，确定所述第一电阻与所述第三电阻之间的正直流母线发生绝缘故障，或者所述第二电阻与所述第四电阻之间的负直流母线发生绝缘故障，或者所述系统中包括所述负载、且位于所述第三电阻和所述第四电阻之间的电路中，除位于所述第一电阻和所述第二电阻之间的电路以外的电路发生绝缘故障，且漏电流为流过所述第三电阻的电流与流过所述第四电阻的电流之差。
结合第三方面的第二种可能的实现方式，在第三种可能的实现方式中，所述方法还包括：
在流过所述第一电阻的电流等于流过所述第二电阻的电流，且流过所述第三电阻的电流等于流过所述第四电阻的电流时，确定包括所述系统绝缘正常。
第四方面，提供一种漏电流检测装置，包括：
检测模块，用于检测流过第一电阻的电流，并检测流过第二电阻的电流；
确定模块，用于确定流过第一电阻的电流与流过第二电阻的电流之差为 漏电流；
其中，所述第一电阻位于正直流母线上，所述第二电阻位于负直流母线上，所述第一电阻和所述第二电阻位于包含正直流母线、负直流母线和负载的系统中的干路中，或者位于所述系统中的同一支路中。
结合第四方面，在第一种可能的实现方式中，
所述确定模块还用于：
在所述漏电流不等于零时，确定所述系统中包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路发生绝缘故障；
在漏电流等于零时，确定所述系统绝缘正常。
结合第四方面，在第二种可能的实现方式中，所述检测模块还用于：
检测流过所述第三电阻的电流，并检测流过所述第四电阻的电流；
其中，所述第三电阻位于正直流母线上，所述第四电阻位于负直流母线上；
若所述第一电阻和所述第二电阻位于所述系统中的干路中，所述第三电阻和所述第四电阻位于所述系统中的同一支路中；则所述确定模块还用于：在流过所述第三电阻的电流不等于流过所述第四电阻的电流时，确定包括所述负载、且位于所述第三电阻和所述第四电阻之间的电路发生绝缘故障，且漏电流为流过所述第三电阻上的电流与流过所述第四电阻上的电流之差；并在流过所述第三电阻的电流等于流过所述第四电阻的电流，且流过所述第一电阻的电流不等于流过所述第二电阻的电流时，确定所述第一电阻与所述第三电阻之间的正直流母线发生绝缘故障，或者所述第二电阻与所述第四电阻之间的负直流母线发生绝缘故障，或者所述系统中包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路中，除位于所述第三电阻和所述第四电阻之间的电路以外的电路发生绝缘故障，且漏电流为流过所述第一电阻的电流与流过所述第二电阻的电流之差；
若所述第一电阻和所述第二电阻位于所述系统中的同一支路中，所述第三电阻和所述第四电阻位于所述系统中的干路中；则所述确定模块还用于： 在流过所述第一电阻的电流不等于流过所述第二电阻的电流时，确定包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路发生绝缘故障，且漏电流为流过所述第一电阻上的电流与流过所述第二电阻上的电流之差；并在流过所述第一电阻的电流等于流过所述第二电阻的电流，且流过所述第三电阻的电流不等于流过所述第四电阻的电流时，确定所述第一电阻与所述第三电阻之间的正直流母线发生绝缘故障，或者所述第二电阻与所述第四电阻之间的负直流母线发生绝缘故障，或者所述系统中包括所述负载、且位于所述第三电阻和所述第四电阻之间的电路中，除位于所述第一电阻和所述第二电阻之间的电路以外的电路发生绝缘故障，且漏电流为流过所述第三电阻的电流与流过所述第四电阻的电流之差。
结合第四方面的第二种可能的实现方式，在第三种可能的实现方式中，所述确定模块还用于：
在流过所述第一电阻的电流等于流过所述第二电阻的电流、且流过所述第三电阻的电流等于流过所述第四电阻的电流时，确定包括所述系统绝缘正常。
本发明实施例的有益效果包括：
本发明实施例提供的一种漏电流检测电路、高压直流系统、漏电流检测方法和装置，由于能够检测流过位于正直流母线上的第一电阻上的电流，并能够检测位于负直流母线上的第二电阻上的电流，并确定流过所述第一电阻的电流与流过所述第二电阻的电流之差，将其作为漏电流，其中，第一电阻和第二电阻可以位于包含正直流母线、负直流母线和负载的系统中的干路中，也可以位于该系统中的同一支路中，因此，采用本发明实施例提供的漏电流检测电路、高压直流系统、漏电流检测方法和装置，能够避免采用检测磁场的传感器检测漏电流时，由于检测磁场的传感器的灵敏度较低，导致漏电流检测的灵敏度较低，并能够避免采用检测磁场的传感器检测漏电流时，由于传感器容易受到环境磁场的干扰，导致系统可靠性降低的问题。
附图说明
图1为现有技术中的漏电流检测的电路结构示意图；
图2a为本发明实施例提供的漏电流检测电路及高压直流系统的结构示意图之一；
图2b为本发明实施例提供的漏电流检测电路及高压直流系统的结构示意图之二；
图3a为本发明实施例提供的漏电流检测电路及高压直流系统的结构示意图之三；
图3b为本发明实施例提供的漏电流检测电路及高压直流系统的结构示意图之四；
图4为本发明实施例提供的漏电流检测方法的流程图之一；
图5为本发明实施例提供的漏电流检测方法的流程图之二；
图6a为本发明实施例提供的漏电流检测方法的流程图之三；
图6b为本发明实施例提供的漏电流检测方法的流程图之四；
图7为本发明实施例提供的漏电流检测装置的结构图。
具体实施方式
本发明实施例提供的一种漏电流检测电路、高压直流系统、漏电流检测方法和装置，由于能够检测流过位于正直流母线上的第一电阻上的电流，并能够检测位于负直流母线上的第二电阻上的电流，并确定流过所述第一电阻的电流与流过所述第二电阻的电流之差，将其作为漏电流，其中，第一电阻和第二电阻可以位于包含正直流母线、负直流母线和负载的系统中的干路中，也可以位于该系统中的同一支路中，这避免了使用检测磁场的传感器来检测漏电流，因此，也避免了采用这种传感器时的缺点。
下面结合说明书附图，对本发明实施例提供的一种漏电流检测电路、高压直流系统、漏电流检测方法和装置的具体实施方式进行说明。
本发明实施例提供的一种漏电流检测电路，如图2a或图2b所示，包括位于正直流母线BUS+上的第一电阻R1，位于负直流母线BUS-上的第二电阻R2，以及分别与第一电阻R1和第二电阻R2相连的检测处理电路21；其中，在图2a中，第一电阻R1和第二电阻R2位于包含正直流母线BUS+、负直流母线BUS-和负载12的系统中的干路中，在图2b中，第一电阻R1和第二电阻R2位于该系统中的同一支路中；在图2a和图2b中，该系统还包括直流电源DC；在图2a和图2b中，均以并联的两路负载12为例进行说明，在实际中可能会有多路负载并联。
检测处理电路21，用于检测流过第一电阻R1的电流I1，并检测流过第二电阻R2的电流I2，以及确定流过第一电阻R1的电流I1与流过第二电阻R2的电流I2之差，即I1-I2为漏电流。
其中，检测处理电路21检测流过一个电阻的电流可以先检测该电阻两端的电压，然后采用欧姆定律，根据该电阻两端的电压以及该电阻的阻值，计算出流过该电阻的电流。
可选地，检测处理电路21，还用于在确定的漏电流，即I1-I2不等于零时，确定系统中包括负载12、且位于第一电阻R1和第二电阻R2之间的电路(即图2a中沿虚线部分的电路或者图2b中沿虚线部分的电路)发生绝缘故障；并在漏电流即I1-I2等于零时，确定该系统绝缘正常。
可选地，本发明实施例提供的漏电流检测电路，如图3a或图3b所示，还包括位于正直流母线BUS+上的第三电阻R3和位于负直流母线BUS-上的第四电阻R4，检测处理电路21分别与第三电阻R3和第四电阻R4相连；
检测处理电路21，还用于检测流过第三电阻R3的电流，并检测流过第四电阻R4的电流；
如图3a所示，第一电阻R1和第二电阻R2位于包含正直流母线BUS+、负直流母线BUS-和负载12的系统中的干路中，第三电阻R3和第四电阻R4位于该系统中的同一支路中；
在图3a中，检测处理电路21，还用于在流过第三电阻R3的电流I3不等 于流过第四电阻R4的电流I4时，确定包括负载12、且位于第三电阻R3和第四电阻R4之间的电路(即图3a中沿虚线部分的电路)发生绝缘故障，且漏电流为流过第三电阻R3上的电流I3与流过第四电阻R4上的电流I4之差，即I3-I4；并在流过第三电阻R3的电流I3等于流过第四电阻R4的电流I4，且流过第一电阻R1的电流I1不等于流过第二电阻R2的电流I2时，确定第一电阻R1与第三电阻R3之间的正直流母线BUS+发生绝缘故障，或者第二电阻R2与第四电阻R4之间的负直流母线BUS-发生绝缘故障，或者该系统中包括负载12、且位于第一电阻R1和第二电阻R2之间的电路中，除位于第三电阻R3和第四电阻R4之间的电路以外的电路(即图3a中的两个负载12中位于左侧的负载12所在的支路)发生绝缘故障，且漏电流为流过第一电阻R1的电流I1与流过第二电阻R2的电流I2之差，即I1-I2。
如图3b所示，第一电阻R1和第二电阻R2位于包含正直流母线BUS+、负直流母线BUS-和负载12的系统中的同一支路中，第三电阻R3和第四电阻R4位于该系统中的干路中；
在图3b中，检测处理电路21，还用于在流过第一电阻R1的电流I1不等于流过第二电阻R2的电流I2时，确定包括负载12、且位于第一电阻R1和第二电阻R2之间的电路(图3b中沿虚线部分的电路)发生绝缘故障，且漏电流为流过第一电阻R1上的电流I1与流过第二电阻R2上的电流I2之差；并在流过第一电阻R1的电流I1等于流过第二电阻R2的电流I2，且流过第三电阻R3的电流I3不等于流过第四电阻R4的电流I4时，确定第一电阻R1与第三电阻R3之间的正直流母线BUS+发生绝缘故障，或者第二电阻R2与第四电阻R4之间的负直流母线BUS-发生绝缘故障，或者该系统中包括负载12、且位于第三电阻R3和第四电阻R4之间的电路中，除位于第一电阻R1和第二电阻R2之间的电路以外的电路(即图3b中的两个负载12中位于左侧的负载12所在的支路)发生绝缘故障，且漏电流为流过第三电阻R3的电流I3与流过第四电阻R4的电流I4之差，即I3-I4。
可选地，检测处理电路21还用于在流过第一电阻R1的电流I1等于流过 第二电阻R2的电流I2、且流过第三电阻R3的电流I3等于流过第四电阻R4的电流I4时，确定包括正直流母线BUS+、负直流母线BUS-、直流电源DC和负载12的系统绝缘正常。
由于在实际应用中，整流模块和负载之间间隔较远，因此，在增加了第三电阻和第四电阻之后，可以缩小故障点范围，快速定位出维修范围。
另外，在实际应用中，系统中可能包括n(n大于或等于2)个并联的负载，此时，如果第一电阻和第二电阻位于系统中的干路中，系统的正直流母线上有n-1个第三电阻，系统的负直流母线上有n-1个第四电阻，每两个第三电阻都位于至少一个负载的两侧，每两个第四电阻都位于至少一个负载的两侧，则根据上述说明，可以迅速缩小故障点范围，快速定位出维修范围。
本发明实施例提供的直流高压系统，如图2a、图2b图3a或者图3b所示，包括直流电源DC、正直流母线BUS+、负直流母线BUS-、整流模块11、负载12和本发明实施例提供的漏电流检测电路。
本发明实施例提供的一种漏电流检测方法，如图4所示，应用于图2a或图2b所示的电路中，该方法包括：
S401、检测流过第一电阻的电流，并检测流过第二电阻的电流；
S402、确定流过第一电阻的电流与流过第二电阻的电流之差为漏电流；
其中，所述第一电阻位于正直流母线上，所述第二电阻位于负直流母线上，所述第一电阻和所述第二电阻位于包含正直流母线、负直流母线和负载的系统中的干路中，或者位于所述系统中的同一支路中。
可选地，本发明实施例提供的漏电流检测方法如图5所示，还包括：
S501、判断确定的漏电流是否为零；当确定的漏电流不为零时，执行S502，当确定的漏电流为零时，执行S503；
S502、确定所述系统中包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路发生绝缘故障；
S503、确定所述系统绝缘正常。
可选地，本发明实施例提供的漏电流检测方法如图6a所示，应用于图3a 所示的漏电流检测电路，即所述第一电阻和所述第三电阻均位于正直流母线上，所述第二电阻和所述第四电阻均位于负直流母线上；且所述第一电阻和所述第二电阻位于所述系统中的干路中，所述第三电阻和所述第四电阻位于所述系统中的同一支路中；该方法包括：
S601、检测流过第一电阻的电流，并检测流过第二电阻的电流，检测流过所述第三电阻的电流，并检测流过所述第四电阻的电流；
S602、判断流过第一电阻的电流、流过第二电阻的电流、流过第三电阻的电流和流过第四电阻的电流是否相等；不相等时，执行S603a；相等时，执行S604；
S603a、在流过所述第三电阻的电流不等于流过所述第四电阻的电流时，确定包括所述负载、且位于所述第三电阻和所述第四电阻之间的电路发生绝缘故障，且漏电流为流过所述第三电阻上的电流与流过所述第四电阻上的电流之差；在流过所述第三电阻的电流等于流过所述第四电阻的电流，且流过所述第一电阻的电流不等于流过所述第二电阻的电流时，确定所述第一电阻与所述第三电阻之间的正直流母线发生绝缘故障，或者所述第二电阻与所述第四电阻之间的负直流母线发生绝缘故障，或者所述系统中包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路中，除位于所述第三电阻和所述第四电阻之间的电路以外的电路发生绝缘故障，且漏电流为流过所述第一电阻的电流与流过所述第二电阻的电流之差；
S604、确定包括所述正直流母线、所述负直流母线、所述直流电源和所述负载的系统绝缘正常。
可选地，本发明实施例提供的漏电流检测方法如图6b所示，应用于图3b所示的漏电流检测电路，即所述第一电阻和所述第三电阻均位于正直流母线上，所述第二电阻和所述第四电阻均位于负直流母线上；且所述第一电阻和所述第二电阻位于所述系统中的同一支路中，所述第三电阻和所述第四电阻位于所述系统中的干路中；该方法包括：
S601、检测流过第一电阻的电流，并检测流过第二电阻的电流，检测流 过所述第三电阻的电流，并检测流过所述第四电阻的电流；
S602、判断流过第一电阻的电流、流过第二电阻的电流、流过第三电阻的电流和流过第四电阻的电流是否相等；不相等时，执行S603b；相等时，执行S604；
S603b、在流过所述第一电阻的电流不等于流过所述第二电阻的电流时，确定包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路发生绝缘故障，且漏电流为流过所述第一电阻上的电流与流过所述第二电阻上的电流之差；在流过所述第一电阻的电流等于流过所述第二电阻的电流，且流过所述第三电阻的电流不等于流过所述第四电阻的电流时，确定所述第一电阻与所述第三电阻之间的正直流母线发生绝缘故障，或者所述第二电阻与所述第四电阻之间的负直流母线发生绝缘故障，或者所述系统中包括所述负载、且位于所述第三电阻和所述第四电阻之间的电路中，除位于所述第一电阻和所述第二电阻之间的电路以外的电路发生绝缘故障，且漏电流为流过所述第三电阻的电流与流过所述第四电阻的电流之差；
S604、确定包括所述正直流母线、所述负直流母线、所述直流电源和所述负载的系统绝缘正常。
上述检测流过一个电阻的电流可以先检测该电阻两端的电压，然后采用欧姆定律，根据该电阻两端的电压以及该电阻的阻值，计算出流过该电阻的电流。
基于同一发明构思，本发明实施例还提供了一种漏电流检测装置，由于该装置所解决问题的原理与前述漏电流检测方法相似，因此该装置的实施可以参见前述方法的实施，重复之处不再赘述。
本发明实施例提供的漏电流检测装置，如图7所示，包括：
检测模块71，用于检测流过第一电阻的电流，并检测流过第二电阻的电流；
确定模块72，用于确定流过第一电阻的电流与流过第二电阻的电流之差为漏电流；
其中，所述第一电阻位于正直流母线上，所述第二电阻位于负直流母线上，所述第一电阻和所述第二电阻位于包含正直流母线、负直流母线和负载的系统中的干路中，或者位于所述系统中的同一支路中。
可选地，确定模块72还用于：在所述漏电流不等于零时，确定所述系统中包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路发生绝缘故障；在漏电流等于零时，确定所述系统绝缘正常。
可选地，检测模块71还用于：检测流过所述第三电阻的电流，并检测流过所述第四电阻的电流；
其中，所述第三电阻位于正直流母线上，所述第四电阻位于负直流母线上；
若所述第一电阻和所述第二电阻位于所述系统中的干路中，所述第三电阻和所述第四电阻位于所述系统中的同一支路中；则确定模块72还用于：在流过所述第三电阻的电流不等于流过所述第四电阻的电流时，确定包括所述负载、且位于所述第三电阻和所述第四电阻之间的电路发生绝缘故障，且漏电流为流过所述第三电阻上的电流与流过所述第四电阻上的电流之差；并在流过所述第三电阻的电流等于流过所述第四电阻的电流，且流过所述第一电阻的电流不等于流过所述第二电阻的电流时，确定所述第一电阻与所述第三电阻之间的正直流母线发生绝缘故障，或者所述第二电阻与所述第四电阻之间的负直流母线发生绝缘故障，或者所述系统中包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路中，除位于所述第三电阻和所述第四电阻之间的电路以外的电路发生绝缘故障，且漏电流为流过所述第一电阻的电流与流过所述第二电阻的电流之差；
若所述第一电阻和所述第二电阻位于所述系统中的同一支路中，所述第三电阻和所述第四电阻位于所述系统中的干路中；则确定模块72还用于：在流过所述第一电阻的电流不等于流过所述第二电阻的电流时，确定包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路发生绝缘故障，且漏电流为流过所述第一电阻上的电流与流过所述第二电阻上的电流之差；并在 流过所述第一电阻的电流等于流过所述第二电阻的电流，且流过所述第三电阻的电流不等于流过所述第四电阻的电流时，确定所述第一电阻与所述第三电阻之间的正直流母线发生绝缘故障，或者所述第二电阻与所述第四电阻之间的负直流母线发生绝缘故障，或者所述系统中包括所述负载、且位于所述第三电阻和所述第四电阻之间的电路中，除位于所述第一电阻和所述第二电阻之间的电路以外的电路发生绝缘故障，且漏电流为流过所述第三电阻的电流与流过所述第四电阻的电流之差。
可选地，确定模块72还用于：在流过所述第一电阻的电流等于流过所述第二电阻的电流、且流过所述第三电阻的电流等于流过所述第四电阻的电流时，确定包括所述正直流母线、所述负直流母线、所述直流电源和所述负载的系统绝缘正常。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或 多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然，本领域的技术人员可以对本发明实施例进行各种改动和变型而不脱离本发明实施例的精神和范围。这样，倘若本发明实施例的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (13)

  1. 一种漏电流检测电路，其特征在于，包括位于正直流母线上的第一电阻，位于负直流母线上的第二电阻，以及分别与所述第一电阻和所述第二电阻相连的检测处理电路；其中，所述第一电阻和所述第二电阻位于包含正直流母线、负直流母线和负载的系统中的干路中，或者位于所述系统中的同一支路中；
    所述检测处理电路，用于检测流过所述第一电阻的电流，并检测流过所述第二电阻的电流，以及确定流过所述第一电阻的电流与流过所述第二电阻的电流之差为漏电流。
  2. 如权利要求1所述的电路，其特征在于，所述检测处理电路，还用于在所述漏电流不等于零时，确定所述系统中包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路发生绝缘故障；并在漏电流等于零时，确定所述系统绝缘正常。
  3. 如权利要求1所述的电路，其特征在于，还包括位于正直流母线上的第三电阻和位于负直流母线上的第四电阻，所述检测处理电路分别与所述第三电阻和所述第四电阻相连；
    所述检测处理电路，还用于检测流过所述第三电阻的电流，并检测流过所述第四电阻的电流；
    当所述第一电阻和所述第二电阻位于所述系统中的干路中时，所述第三电阻和所述第四电阻位于所述系统中的同一支路中；所述检测处理电路，还用于在流过所述第三电阻的电流不等于流过所述第四电阻的电流时，确定包括所述负载、且位于所述第三电阻和所述第四电阻之间的电路发生绝缘故障，且漏电流为流过所述第三电阻上的电流与流过所述第四电阻上的电流之差；并在流过所述第三电阻的电流等于流过所述第四电阻的电流，且流过所述第一电阻的电流不等于流过所述第二电阻的电流时，确定所述第一电阻与所述第三电阻之间的正直流母线发生绝缘故障，或者所述第二电阻与所述第四电 阻之间的负直流母线发生绝缘故障，或者所述系统中包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路中，除位于所述第三电阻和所述第四电阻之间的电路以外的电路发生绝缘故障，且漏电流为流过所述第一电阻的电流与流过所述第二电阻的电流之差；
    当所述第一电阻和所述第二电阻位于所述系统中的同一支路中时，所述第三电阻和所述第四电阻位于所述系统中的干路中；所述检测处理电路，还用于在流过所述第一电阻的电流不等于流过所述第二电阻的电流时，确定包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路发生绝缘故障，且漏电流为流过所述第一电阻上的电流与流过所述第二电阻上的电流之差；并在流过所述第一电阻的电流等于流过所述第二电阻的电流，且流过所述第三电阻的电流不等于流过所述第四电阻的电流时，确定所述第一电阻与所述第三电阻之间的正直流母线发生绝缘故障，或者所述第二电阻与所述第四电阻之间的负直流母线发生绝缘故障，或者所述系统中包括所述负载、且位于所述第三电阻和所述第四电阻之间的电路中，除位于所述第一电阻和所述第二电阻之间的电路以外的电路发生绝缘故障，且漏电流为流过所述第三电阻的电流与流过所述第四电阻的电流之差。
  4. 如权利要求3所述的电路，其特征在于，所述检测处理电路还用于在流过所述第一电阻的电流等于流过所述第二电阻的电流，且流过所述第三电阻的电流等于流过所述第四电阻的电流时，确定包括所述系统绝缘正常。
  5. 一种直流高压系统，其特征在于，包括直流电源、正直流母线、负直流母线、整流模块、负载和如权利要求1～4任一所述的漏电流检测电路。
  6. 一种漏电流检测方法，其特征在于，包括：
    检测流过第一电阻的电流，并检测流过第二电阻的电流；
    确定流过第一电阻的电流与流过第二电阻的电流之差为漏电流；
    其中，所述第一电阻位于正直流母线上，所述第二电阻位于负直流母线上，所述第一电阻和所述第二电阻位于包含正直流母线、负直流母线和负载的系统中的干路中，或者位于所述系统中的同一支路中。
  7. 如权利要求6所述的方法，其特征在于，所述方法还包括：
    在所述漏电流不等于零时，确定所述系统中包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路发生绝缘故障；
    在漏电流等于零时，确定所述系统绝缘正常。
  8. 如权利要求6所述的方法，其特征在于，所述方法还包括：
    检测流过所述第三电阻的电流，并检测流过所述第四电阻的电流；
    其中，所述第三电阻位于正直流母线上，所述第四电阻位于负直流母线上；
    若所述第一电阻和所述第二电阻位于所述系统中的干路中，所述第三电阻和所述第四电阻位于所述系统中的同一支路中；
    则在流过所述第三电阻的电流不等于流过所述第四电阻的电流时，确定包括所述负载、且位于所述第三电阻和所述第四电阻之间的电路发生绝缘故障，且漏电流为流过所述第三电阻上的电流与流过所述第四电阻上的电流之差；
    在流过所述第三电阻的电流等于流过所述第四电阻的电流，且流过所述第一电阻的电流不等于流过所述第二电阻的电流时，确定所述第一电阻与所述第三电阻之间的正直流母线发生绝缘故障，或者所述第二电阻与所述第四电阻之间的负直流母线发生绝缘故障，或者所述系统中包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路中，除位于所述第三电阻和所述第四电阻之间的电路以外的电路发生绝缘故障，且漏电流为流过所述第一电阻的电流与流过所述第二电阻的电流之差；
    若所述第一电阻和所述第二电阻位于所述系统中的同一支路中，所述第三电阻和所述第四电阻位于所述系统中的干路中；
    则在流过所述第一电阻的电流不等于流过所述第二电阻的电流时，确定包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路发生绝缘故障，且漏电流为流过所述第一电阻上的电流与流过所述第二电阻上的电流之差；
    在流过所述第一电阻的电流等于流过所述第二电阻的电流，且流过所述第三电阻的电流不等于流过所述第四电阻的电流时，确定所述第一电阻与所述第三电阻之间的正直流母线发生绝缘故障，或者所述第二电阻与所述第四电阻之间的负直流母线发生绝缘故障，或者所述系统中包括所述负载、且位于所述第三电阻和所述第四电阻之间的电路中，除位于所述第一电阻和所述第二电阻之间的电路以外的电路发生绝缘故障，且漏电流为流过所述第三电阻的电流与流过所述第四电阻的电流之差。
  9. 如权利要求8所述的方法，其特征在于，所述方法还包括：
    在流过所述第一电阻的电流等于流过所述第二电阻的电流，且流过所述第三电阻的电流等于流过所述第四电阻的电流时，确定包括所述系统绝缘正常。
  10. 一种漏电流检测装置，其特征在于，包括：
    检测模块，用于检测流过第一电阻的电流，并检测流过第二电阻的电流；
    确定模块，用于确定流过第一电阻的电流与流过第二电阻的电流之差为漏电流；
    其中，所述第一电阻位于正直流母线上，所述第二电阻位于负直流母线上，所述第一电阻和所述第二电阻位于包含正直流母线、负直流母线和负载的系统中的干路中，或者位于所述系统中的同一支路中。
  11. 如权利要求10所述的装置，其特征在于，所述确定模块还用于：
    在所述漏电流不等于零时，确定所述系统中包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路发生绝缘故障；
    在漏电流等于零时，确定所述系统绝缘正常。
  12. 如权利要求10所述的装置，其特征在于，所述检测模块还用于：
    检测流过所述第三电阻的电流，并检测流过所述第四电阻的电流；
    其中，所述第三电阻位于正直流母线上，所述第四电阻位于负直流母线上；
    若所述第一电阻和所述第二电阻位于所述系统中的干路中，所述第三电 阻和所述第四电阻位于所述系统中的同一支路中；则所述确定模块还用于：在流过所述第三电阻的电流不等于流过所述第四电阻的电流时，确定包括所述负载、且位于所述第三电阻和所述第四电阻之间的电路发生绝缘故障，且漏电流为流过所述第三电阻上的电流与流过所述第四电阻上的电流之差；并在流过所述第三电阻的电流等于流过所述第四电阻的电流，且流过所述第一电阻的电流不等于流过所述第二电阻的电流时，确定所述第一电阻与所述第三电阻之间的正直流母线发生绝缘故障，或者所述第二电阻与所述第四电阻之间的负直流母线发生绝缘故障，或者所述系统中包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路中，除位于所述第三电阻和所述第四电阻之间的电路以外的电路发生绝缘故障，且漏电流为流过所述第一电阻的电流与流过所述第二电阻的电流之差；
    若所述第一电阻和所述第二电阻位于所述系统中的同一支路中，所述第三电阻和所述第四电阻位于所述系统中的干路中；则所述确定模块还用于：在流过所述第一电阻的电流不等于流过所述第二电阻的电流时，确定包括所述负载、且位于所述第一电阻和所述第二电阻之间的电路发生绝缘故障，且漏电流为流过所述第一电阻上的电流与流过所述第二电阻上的电流之差；并在流过所述第一电阻的电流等于流过所述第二电阻的电流，且流过所述第三电阻的电流不等于流过所述第四电阻的电流时，确定所述第一电阻与所述第三电阻之间的正直流母线发生绝缘故障，或者所述第二电阻与所述第四电阻之间的负直流母线发生绝缘故障，或者所述系统中包括所述负载、且位于所述第三电阻和所述第四电阻之间的电路中，除位于所述第一电阻和所述第二电阻之间的电路以外的电路发生绝缘故障，且漏电流为流过所述第三电阻的电流与流过所述第四电阻的电流之差。
  13. 如权利要求12所述的装置，其特征在于，所述确定模块还用于：在流过所述第一电阻的电流等于流过所述第二电阻的电流、且流过所述第三电阻的电流等于流过所述第四电阻的电流时，确定包括所述系统绝缘正常。
PCT/CN2015/075032 2014-04-29 2015-03-25 一种漏电流检测电路、直流高压系统、检测方法和装置 WO2015165314A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP15785269.0A EP3130931B1 (en) 2014-04-29 2015-03-25 Leakage current detection circuit, direct-current high-voltage system, and leakage current detection method and device
US15/339,117 US10168376B2 (en) 2014-04-29 2016-10-31 Leakage current detection circuit, high voltage direct current system, and detection method and apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201410178867.6 2014-04-29
CN201410178867.6A CN103941141B (zh) 2014-04-29 2014-04-29 一种漏电流检测电路、直流高压系统、检测方法和装置

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US15/339,117 Continuation US10168376B2 (en) 2014-04-29 2016-10-31 Leakage current detection circuit, high voltage direct current system, and detection method and apparatus

Publications (1)

Publication Number Publication Date
WO2015165314A1 true WO2015165314A1 (zh) 2015-11-05

Family

ID=51188890

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2015/075032 WO2015165314A1 (zh) 2014-04-29 2015-03-25 一种漏电流检测电路、直流高压系统、检测方法和装置

Country Status (4)

Country Link
US (1) US10168376B2 (zh)
EP (1) EP3130931B1 (zh)
CN (1) CN103941141B (zh)
WO (1) WO2015165314A1 (zh)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103941141B (zh) * 2014-04-29 2017-06-13 华为技术有限公司 一种漏电流检测电路、直流高压系统、检测方法和装置
WO2016046047A1 (en) * 2014-09-22 2016-03-31 Alstom Technology Ltd Synthetic test circuit
CN104614627A (zh) * 2014-12-21 2015-05-13 深圳市柏特瑞电子有限公司 一种移动式直流漏电检测定位设备和检测定位方法
KR101695202B1 (ko) * 2015-01-20 2017-01-11 주식회사 소프트커널 전기적인 부하를 위한 누설전류 차단장치
CN106353657A (zh) * 2016-11-28 2017-01-25 国网福建省电力有限公司 高压直流电缆局部放电智能监测装置及监测方法
CN106680651A (zh) * 2017-01-03 2017-05-17 重庆长安汽车股份有限公司 一种漏电流检测装置及车辆充电设备
CN110474302A (zh) * 2018-05-11 2019-11-19 南京南瑞继保电气有限公司 一种中低压直流配电网母线保护系统及方法
DE102019106402A1 (de) * 2019-03-13 2020-09-17 Vorwerk & Co. Interholding Gmbh Akkumulator sowie elektrisches Gerät mit einem elektrischen Verbraucher und einem Akkumulator
JP7286244B2 (ja) * 2019-03-28 2023-06-05 ダイハツ工業株式会社 プラズマリアクターシステム
CN112394216B (zh) * 2019-08-19 2022-04-12 华为技术有限公司 漏电流传感器、漏电流检测电路以及电源设备
JP7341836B2 (ja) * 2019-10-09 2023-09-11 株式会社マキタ 電動作業機
CN111487560B (zh) * 2020-04-29 2022-07-12 南京国臣直流配电科技有限公司 一种直流漏电保护方法
CN112066516B (zh) * 2020-08-03 2021-08-20 珠海格力电器股份有限公司 一种空调、故障自诊断方法、外机定位故障方法及遥控器
CN112952748A (zh) * 2021-02-01 2021-06-11 重庆中车长客轨道车辆有限公司 一种漏电保护装置
BE1029560B1 (de) * 2021-07-05 2023-02-06 Phoenix Contact Gmbh & Co Fehlerstromüberwachung für ein Gleichspannungsschaltgerät
CN116203456A (zh) * 2021-11-30 2023-06-02 比亚迪股份有限公司 车辆及其漏电检测定位方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120314327A1 (en) * 2011-05-20 2012-12-13 Liu Yow-Chyi Dc power supply insulation fault detection circuit
CN102830283A (zh) * 2011-06-13 2012-12-19 中兴通讯股份有限公司 一种直流电源绝缘检测装置及其检测方法
CN103229060A (zh) * 2011-09-09 2013-07-31 伊莎贝尔努特·霍伊斯勒两合公司 差动电流传感器
CN103779833A (zh) * 2014-02-21 2014-05-07 朱志伟 直流漏电流检测与保护电路及检测与保护方法
CN103941141A (zh) * 2014-04-29 2014-07-23 华为技术有限公司 一种漏电流检测电路、直流高压系统、检测方法和装置

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000002738A (ja) * 1998-06-17 2000-01-07 Shihen Tech Corp 直流漏電検出装置
US6763107B1 (en) * 1999-11-02 2004-07-13 Agere Systems Inc. Method and apparatus for reducing distortion in a line powered modulator circuit
US6845156B1 (en) * 2000-02-29 2005-01-18 Agere Systems, Inc. System for reducing distortion in a line powered modulator
US6768318B2 (en) * 2001-02-22 2004-07-27 Texas Instruments Incorporated Signal conditioning circuit for resistive sensors
CN100487466C (zh) 2002-12-05 2009-05-13 南京光露电子有限公司 全电流回路电阻取样的电能量计量装置及其计量方法
US7459914B2 (en) * 2006-10-31 2008-12-02 Caterpillar Inc. Systems and methods for electrical leakage detection
CN101706541B (zh) * 2009-12-04 2012-12-26 中国电力科学研究院 一种直流输电换流阀故障电流实验检测装置
CN103091596B (zh) * 2013-01-10 2015-02-25 浙江中碳科技有限公司 一种平衡双投切电路及基于该电路的绝缘检测装置和方法
CN203324419U (zh) * 2013-05-27 2013-12-04 深圳奥特迅电力设备股份有限公司 一种直流电源绝缘检测装置
KR102190140B1 (ko) * 2014-09-15 2020-12-14 삼성디스플레이 주식회사 스트레쳐블 표시 장치 및 이의 휘도 보상 방법
EP3286842B1 (en) * 2015-04-20 2019-03-06 Microsemi P.O.E. Ltd. Reverse power feeding system and method
DE102015210941B9 (de) * 2015-06-15 2019-09-19 Carl Zeiss Microscopy Gmbh Teilchenstrahlgerät und Verfahren zum Betrieb eines Teilchenstrahlgeräts

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120314327A1 (en) * 2011-05-20 2012-12-13 Liu Yow-Chyi Dc power supply insulation fault detection circuit
CN102830283A (zh) * 2011-06-13 2012-12-19 中兴通讯股份有限公司 一种直流电源绝缘检测装置及其检测方法
CN103229060A (zh) * 2011-09-09 2013-07-31 伊莎贝尔努特·霍伊斯勒两合公司 差动电流传感器
CN103779833A (zh) * 2014-02-21 2014-05-07 朱志伟 直流漏电流检测与保护电路及检测与保护方法
CN103941141A (zh) * 2014-04-29 2014-07-23 华为技术有限公司 一种漏电流检测电路、直流高压系统、检测方法和装置

Also Published As

Publication number Publication date
CN103941141B (zh) 2017-06-13
EP3130931A4 (en) 2017-03-29
US10168376B2 (en) 2019-01-01
CN103941141A (zh) 2014-07-23
EP3130931B1 (en) 2020-07-08
US20170045568A1 (en) 2017-02-16
EP3130931A1 (en) 2017-02-15

Similar Documents

Publication Publication Date Title
WO2015165314A1 (zh) 一种漏电流检测电路、直流高压系统、检测方法和装置
GB2538342B (en) Detecting sensor error
US9448275B2 (en) Fault detection of four wire variable differential transformer sensors
US10605626B2 (en) Angle sensor bridges including star-connected magnetoresistive elements
WO2016081759A4 (en) DETECTING GROUND ISOLATION FAULT IN ETHERNET PoDL SYSTEM
US20110241590A1 (en) Motor driving apparatus having fault diagnostic function
JP2018081098A5 (zh)
CN103091539B (zh) 供在测量通过导体的电流中使用的系统和方法
BR102015029802B1 (pt) Sistema de transferência de potência de corrente contínua e método
RU2014103243A (ru) Система и способ обнаружения повреждений и система электропитания кабелей для непосредственного электрического нагрева подводных трубопроводов
MX2016001873A (es) Protección distribuida contra falla de arco eléctrico entre tomacorriente y cortacircuito.
WO2018221619A1 (ja) 漏電検出方法
EP3026449A3 (en) System and method of electric motor fault detection
WO2015112572A3 (en) Sensitive and selective ground fault detection
US20190041240A1 (en) Rotation Angle Detector and Torque Sensor
JP2008292403A (ja) 組電池の異常検出方法及びその異常検出装置
US10996246B2 (en) Current detection method, current detection device, signal correction method for current detection device, and signal correction device for current detection device
WO2019015350A1 (zh) 一种电机控制模式故障检测方法及装置
CN205646778U (zh) 变频器输出电流检测电路
KR100816101B1 (ko) 활선 상태에서의 누전 탐사 장치
CN105655982A (zh) 变频器输出电流检测电路及其检测方法
WO2015111163A1 (ja) 磁気検出装置
JPWO2015141235A1 (ja) 電力センサ、電力センサシステム、及び回生電力検出装置
JP2016191575A (ja) 電流検出回路、及びその回路を備えた車両用電子制御装置
US9293908B2 (en) Method of measurement for detecting a fault of a three-phase zone

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15785269

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

REEP Request for entry into the european phase

Ref document number: 2015785269

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2015785269

Country of ref document: EP