CN112881946B - Double-core current transformer disconnection detection method and device and circuit breaker - Google Patents
Double-core current transformer disconnection detection method and device and circuit breaker Download PDFInfo
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- CN112881946B CN112881946B CN202110057310.7A CN202110057310A CN112881946B CN 112881946 B CN112881946 B CN 112881946B CN 202110057310 A CN202110057310 A CN 202110057310A CN 112881946 B CN112881946 B CN 112881946B
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- 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
- G01R31/54—Testing for continuity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/04—Means for indicating condition of the switching device
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Engineering & Computer Science (AREA)
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a broken line detection method of a double-core current transformer, wherein the double-core current transformer is provided with an energy supply coil for extracting electric energy from a bus and a measuring coil for measuring the current of the bus; a voltage signal processing circuit is connected to the output end of the energy supply coil and is configured to: when the bus current is greater than or equal to I, the voltage signal processing circuit outputs an indication signal S; and continuously monitoring the signal output condition of the voltage signal processing circuit and a bus current measured value Irms obtained by the measuring coil, and detecting and judging the disconnection fault of the double-core current transformer according to the monitoring result. The invention also discloses a device for detecting the disconnection of the double-core current transformer and a circuit breaker. Compared with the prior art, the invention can realize the real-time online detection of the disconnection faults of the energy supply coil and the measuring coil of the double-core mutual inductor, and has the advantages of simple circuit and low realization cost.
Description
Technical Field
The invention relates to a method for detecting the disconnection of a mutual inductor, in particular to a method for detecting the disconnection of a double-core current mutual inductor.
Background
Circuit breakers have found widespread use as important components of low voltage power distribution systems, and are tasked with protecting power distribution networks and electrical equipment from electrical faults such as overloads, short circuits, and the like. Traditional intelligent circuit breakers employ single core current transformers as energy supply and current sampling elements. With the improvement of the requirement of users on the measurement precision, the circuit breaker adopting the double-core current transformer appears, namely, an iron core coil is adopted as an energy supply element, and a Roche air core coil is adopted as a current sampling element. Although the circuit of the current transformer is less likely to be broken, when a disconnection fault occurs in the current transformer (for a dual-core current transformer, whether an iron core coil is disconnected or an air core coil is disconnected), the circuit breaker is rejected and mistakenly operated, and the safe operation of a power system is risked, so that the disconnection fault of the transformer of the circuit breaker needs to be detected and identified.
In the prior art, most of intelligent circuit breakers adopting a double-core current transformer do not have the function of monitoring the state of the transformer in real time, and a few of circuit breakers with the current transformer state monitoring function only realize the judgment of whether a rogowski air-core coil (measuring coil) is broken or not, but cannot judge whether an iron core energy supply coil is broken or not. If the Rogowski air-core coil is applied with a bias level and the bias level is detected, the identification of the broken Rogowski air-core coil is realized, and the judgment of the broken wire of the iron core energy supply coil is not made.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for detecting the disconnection of a dual-core current transformer, which can realize the real-time online detection of the disconnection faults of an energy supply coil and a measuring coil of the dual-core transformer, and has the advantages of simple circuit and low realization cost.
The invention specifically adopts the following technical scheme to solve the technical problems:
a broken line detection method of a two-core current transformer is disclosed, wherein the two-core current transformer is provided with an energy supply coil used for extracting electric energy from a bus and a measuring coil used for measuring the current of the bus; a voltage signal processing circuit is connected to the output end of the energy supply coil and is configured to: when the bus current is greater than or equal to I, the voltage signal processing circuit outputs an indication signal S; continuously monitoring the signal output condition of the voltage signal processing circuit and a bus current measured value Irms obtained by a measuring coil, and detecting and distinguishing the broken line fault of the double-core current transformer according to the following judgment reference: if the situation that the Irms is less than Iset1 while the indication signal S is monitored and the situation that the Irms is more than or equal to Iset1 does not occur within the preset delay time T, determining that the disconnection fault occurs in the measuring coil of the double-core current transformer; if the indicating signal S is not monitored, the Irms is greater than Iset2, and the condition that the Irms is less than or equal to Iset2 does not occur within the preset delay time T, determining that the power supply coil of the dual-core current transformer has a disconnection fault; the preset delay time T is not less than 0, and the preset current thresholds I, Iset1 and Iset2 meet the condition that Iset1 is 0 and I is less than Iset 2.
Preferably, the value range of the preset delay time T is between one bus current cycle and 10 s.
Preferably, Iset1 ═ K1 ═ I, Iset2 ═ K2 ═ I; the value range of K1 is [0.5, 0.95], and the value range of K2 is [1.05, 1.2 ].
Preferably, the value range of I is 0.1-0.5 In, Iset2< In, and In is the rated working current of the bus.
Preferably, the voltage signal processing circuit includes resistors R1 to R3 and a transistor V1, one end of the resistor R2 is connected to the output end of the power supply coil, the other end of the resistor R2 is connected to one end of the resistor R3 and the base of the transistor V1, the other end of the resistor R3 is connected to the emitter of the transistor V1 and then grounded, one end of the resistor R1 is connected to the operating power supply, the other end of the resistor R1 is connected to the collector of the transistor V1, and a connection point between the two is used as an indication signal output end of the voltage signal processing circuit.
Based on the same inventive concept, the following technical scheme can be obtained:
a broken wire detection device of a two-core current transformer is provided, wherein the two-core current transformer is provided with an energy supply coil used for extracting electric energy from a bus and a measuring coil used for measuring the current of the bus; the device includes:
a voltage signal processing circuit connected with an output of the energizing coil and configured to: when the bus current is greater than or equal to I, the voltage signal processing circuit outputs an indication signal S;
and the broken line judging module is used for continuously monitoring the signal output condition of the voltage signal processing circuit and a bus current measured value Irms obtained by the measuring coil, and detecting and judging the broken line fault of the double-core current transformer according to the following judgment reference: if the situation that the Irms is less than Iset1 while the indication signal S is monitored and the situation that the Irms is more than or equal to Iset1 does not occur within the preset delay time T, determining that the disconnection fault occurs in the measuring coil of the double-core current transformer; if the indicating signal S is not monitored, the Irms is greater than Iset2, and the condition that the Irms is less than or equal to Iset2 does not occur within the preset delay time T, determining that the power supply coil of the dual-core current transformer has a disconnection fault; the preset delay time T is not less than 0, and the preset current thresholds I, Iset1 and Iset2 meet the condition that Iset1 is 0 and I is less than Iset 2.
Preferably, the value range of the preset delay time T is between one bus current cycle and 10 s.
Preferably, Iset1 ═ K1 ═ I, Iset2 ═ K2 ═ I; the value range of K1 is [0.5, 0.95], and the value range of K2 is [1.05, 1.2 ].
Preferably, the value range of I is 0.1-0.5 In, Iset2< In, and In is the rated working current of the bus.
Preferably, the voltage signal processing circuit includes resistors R1 to R3 and a transistor V1, one end of the resistor R2 is connected to the output end of the power supply coil, the other end of the resistor R2 is connected to one end of the resistor R3 and the base of the transistor V1, the other end of the resistor R3 is connected to the emitter of the transistor V1 and then grounded, one end of the resistor R1 is connected to the operating power supply, the other end of the resistor R1 is connected to the collector of the transistor V1, and a connection point between the two is used as an indication signal output end of the voltage signal processing circuit.
A circuit breaker comprising a two-core current transformer having an energizing coil for extracting electrical energy from a bus and a measuring coil for measuring the bus current; the circuit breaker also comprises a disconnection detection device of the double-core current transformer according to any technical scheme.
Further, the circuit breaker further comprises an indicating circuit for indicating the detection result of the broken line detection device of the twin-core current transformer.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. according to the technical scheme, the disconnection faults of the energy supply coil and the measuring coil of the double-core current transformer can be accurately identified.
2. According to the technical scheme, the circuit breaker can be subjected to real-time disconnection monitoring in the operation process, and the current measurement and protection of the original circuit breaker cannot be influenced.
3. The technical scheme of the invention has simple realization circuit, does not need to increase extra hardware and has low realization cost.
Drawings
Fig. 1 is a schematic structural principle diagram of a specific embodiment of the disconnection detection device for the twin-core current transformer of the present invention;
fig. 2 is a block diagram of an application example of the present invention in a three-phase four-wire system.
Detailed Description
Aiming at the defects of the prior art, the invention solves the technical scheme that a voltage signal processing circuit is connected at the output end of an energy supply coil of the double-core current transformer and is specially arranged, and then the disconnection faults of the energy supply coil and the measuring coil of the double-core current transformer are detected on line in real time according to the signal output condition of the voltage signal processing circuit and the bus current measuring value obtained by the measuring coil.
Specifically, the method for detecting the disconnection of the twin-core current transformer specifically comprises the following steps:
the double-core current transformer is provided with an energy supply coil for extracting electric energy from a bus and a measuring coil for measuring the bus current; a voltage signal processing circuit is connected to the output end of the energy supply coil and is configured to: when the bus current is greater than or equal to I, the voltage signal processing circuit outputs an indication signal S; continuously monitoring the signal output condition of the voltage signal processing circuit and a bus current measured value Irms obtained by a measuring coil, and detecting and distinguishing the broken line fault of the double-core current transformer according to the following judgment reference: if the situation that the Irms is less than Iset1 while the indication signal S is monitored and the situation that the Irms is more than or equal to Iset1 does not occur within the preset delay time T, determining that the disconnection fault occurs in the measuring coil of the double-core current transformer; if the indicating signal S is not monitored, the Irms is greater than Iset2, and the condition that the Irms is less than or equal to Iset2 does not occur within the preset delay time T, determining that the power supply coil of the dual-core current transformer has a disconnection fault; the preset delay time T is not less than 0, and the preset current thresholds I, Iset1 and Iset2 meet the condition that Iset1 is 0 and I is less than Iset 2.
For the public understanding, the technical scheme of the invention is explained in detail by the specific embodiment and the attached drawings:
as shown in fig. 1, the dual-core current transformer in this embodiment is used for a circuit breaker, and includes an energy supply coil L1 and a measurement coil L2 respectively disposed on a bus, wherein an output end of the energy supply coil L1 is connected to a power supply circuit formed by a rectifying circuit, a limiting circuit, and a DC/DC circuit connected in sequence, an output end of the measurement coil L2 is connected to a current signal processing circuit formed by an integrating circuit and an amplifying circuit, the power supply circuit is configured to convert electric energy extracted from the bus by the energy supply coil L1 into power required by each electrical component in the circuit breaker, and the current signal processing circuit is configured to process a bus current signal collected by the measurement coil L2 and provide the processed bus current signal to a control circuit including a microcontroller, so as to calculate a bus current measurement value Irms.
As shown in fig. 1, a voltage signal processing circuit is connected to the output terminal of the power supply coil L1, and is configured to: when the bus current is greater than or equal to I, the voltage signal processing circuit outputs an indication signal S; the preferable value range of the preset threshold value I is 0.1-0.5 In, and In is the rated working current of the bus or the breaker; in this embodiment, the value of I is the minimum starting current of the circuit breaker, i.e., the minimum current that can enable the energy supply coil to supply power to the power circuit and enable the circuit breaker to normally operate.
As shown in fig. 1, the voltage signal processing circuit in this embodiment includes resistors R1-R3 and a transistor V1, one end of the resistor R2 is connected to the output end of the power supply coil, the other end of the resistor R2 is connected to one end of the resistor R3 and the base of the transistor V1, the other end of the resistor R3 is connected to the emitter of the transistor V1 and then grounded, one end of the resistor R1 is connected to the operating power VCC, the other end of the resistor R1 is connected to the collector of the transistor V1, and a connection point between the two terminals serves as an indication signal output end of the voltage signal processing circuit. The bus current threshold I corresponding to the indication signal S output by the voltage signal processing circuit can be adjusted through the resistance values of the resistors R1-R3.
The control circuit continuously monitors the signal output condition of the voltage signal processing circuit and a bus current measured value Irms obtained by the measuring coil, and detects and judges the broken line fault of the double-core current transformer according to the following judgment reference:
if the voltage signal processing circuit outputs an indication signal S, and the Irms is smaller than Iset1 and the condition that the Irms is larger than or equal to Iset1 does not occur within the preset delay time T, judging that the measuring coil of the double-core current transformer has a disconnection fault; otherwise, continuing to monitor;
if the voltage signal processing circuit does not output the indication signal S, and meanwhile Irms is greater than Iset2, and the condition that Irms is less than or equal to Iset2 does not occur within the preset delay time T, determining that the power supply coil of the dual-core current transformer has a disconnection fault; otherwise, continuing to monitor;
the preset current thresholds I, Iset1 and Iset2 satisfy 0< Iset1< I < Iset2< In, and In is the rated working current of the bus.
The preset delay time T can be 0, namely, the disconnection judgment is directly carried out without delay; or may be some preset value other than 0; the preferable value range is between one bus current period and 10 s.
Preferably, Iset1 ═ K1 ═ I, Iset2 ═ K2 ═ I; the value ranges of K1 and K2 are [0.5, 0.95], and K1 and K2 allow a certain difference threshold value between the actual current and the detection current.
Fig. 2 shows a specific application example of the circuit breaker in a three-phase four-wire system, where the circuit breaker includes four dual-core current transformers respectively disposed on A, B, C, N lines, and the disconnection detection method for the dual-core current transformers is adopted to perform disconnection detection on each line A, B, C, N, so as to determine whether there is a disconnection fault in the energy supply coil and the measurement coil of the corresponding dual-core current transformer. The microcontroller circuit controls the magnetic flux converter to perform tripping action through the tripping circuit according to the bus current information and the broken line detection information detected by the double-core current transformer, so that circuit protection is realized. As shown in fig. 2, the circuit breaker further includes an indicating circuit and a parameter setting circuit; the indicating circuit comprises a display module and a light emitting diode and is used for indicating the operating state of the circuit breaker and the detection result of the double-core current transformer disconnection detection device; the setting circuit is used for setting the numerical values of the parameters K1 and K2.
Claims (12)
1. A broken line detection method of a two-core current transformer is disclosed, wherein the two-core current transformer is provided with an energy supply coil used for extracting electric energy from a bus and a measuring coil used for measuring the current of the bus; the power supply coil is characterized in that a voltage signal processing circuit is connected to the output end of the power supply coil and is configured to: when the bus current is greater than or equal to I, the voltage signal processing circuit outputs an indication signal S; continuously monitoring the signal output condition of the voltage signal processing circuit and a bus current measured value Irms obtained by a measuring coil, and detecting and distinguishing the broken line fault of the double-core current transformer according to the following judgment reference: if the situation that the Irms is less than Iset1 while the indication signal S is monitored and the situation that the Irms is more than or equal to Iset1 does not occur within the preset delay time T, determining that the disconnection fault occurs in the measuring coil of the double-core current transformer; if the indicating signal S is not monitored, the Irms is greater than Iset2, and the condition that the Irms is less than or equal to Iset2 does not occur within the preset delay time T, determining that the power supply coil of the dual-core current transformer has a disconnection fault; the preset delay time T is not less than 0, and the preset current thresholds I, Iset1 and Iset2 meet the condition that Iset1 is 0 and I is less than Iset 2.
2. The method for detecting the disconnection of the twin-core current transformer according to claim 1, wherein the preset delay time T ranges from one bus current cycle to 10 s.
3. The method for detecting the disconnection of the twin-core current transformer according to claim 1, wherein Iset1 ═ K1 ═ I, Iset2 ═ K2 ═ I; the value range of K1 is [0.5, 0.95], and the value range of K2 is [1.05, 1.2 ].
4. The method for detecting the disconnection of the twin-core current transformer of claim 1, wherein the value range of I is 0.1-0.5 In, Iset2< In, and In is the rated working current of the bus.
5. The method for detecting the disconnection of the dual-core current transformer as claimed in claim 1, wherein the voltage signal processing circuit comprises resistors R1-R3 and a transistor V1, one end of the resistor R2 is connected to the output end of the power supply coil, the other end of the resistor R2 is connected to one end of a resistor R3 and the base of a transistor V1, the other end of the resistor R3 is connected to the emitter of the transistor V1 and then grounded, one end of the resistor R1 is connected to the working power supply, the other end of the resistor R1 is connected to the collector of the transistor V1, and the connection point of the two is used as the indication signal output end of the voltage signal processing circuit.
6. A broken wire detection device of a two-core current transformer is provided, wherein the two-core current transformer is provided with an energy supply coil used for extracting electric energy from a bus and a measuring coil used for measuring the current of the bus; characterized in that the device comprises:
a voltage signal processing circuit connected with an output of the energizing coil and configured to: when the bus current is greater than or equal to I, the voltage signal processing circuit outputs an indication signal S;
and the broken line judging module is used for continuously monitoring the signal output condition of the voltage signal processing circuit and a bus current measured value Irms obtained by the measuring coil, and detecting and judging the broken line fault of the double-core current transformer according to the following judgment reference: if the situation that the Irms is less than Iset1 while the indication signal S is monitored and the situation that the Irms is more than or equal to Iset1 does not occur within the preset delay time T, determining that the disconnection fault occurs in the measuring coil of the double-core current transformer; if the indicating signal S is not monitored, the Irms is greater than Iset2, and the condition that the Irms is less than or equal to Iset2 does not occur within the preset delay time T, determining that the power supply coil of the dual-core current transformer has a disconnection fault; the preset delay time T is not less than 0, and the preset current thresholds I, Iset1 and Iset2 meet the condition that Iset1 is 0 and I is less than Iset 2.
7. The device for detecting the disconnection of the twin-core current transformer according to claim 6, wherein the preset delay time T is within a range from one bus current cycle to 10 s.
8. The apparatus for detecting the disconnection of a two-core current transformer according to claim 6, wherein Iset1 ═ K1 ═ I, Iset2 ═ K2 ═ I; the value range of K1 is [0.5, 0.95], and the value range of K2 is [1.05, 1.2 ].
9. The device for detecting the disconnection of the twin-core current transformer of claim 6, wherein the value range of I is 0.1-0.5 In, Iset2< In, and In is the rated working current of the bus.
10. The disconnection detecting device of a dual-core current transformer as claimed in claim 6, wherein the voltage signal processing circuit comprises resistors R1-R3 and a transistor V1, one end of the resistor R2 is connected to the output end of the power supply coil, the other end of the resistor R2 is connected to one end of the resistor R3 and the base of the transistor V1, the other end of the resistor R3 is connected to the emitter of the transistor V1 and then grounded, one end of the resistor R1 is connected to the operating power supply, the other end of the resistor R1 is connected to the collector of the transistor V1, and the connection point of the two is used as the indication signal output end of the voltage signal processing circuit.
11. A circuit breaker comprising a two-core current transformer having an energizing coil for extracting electrical energy from a bus and a measuring coil for measuring the bus current; the circuit breaker is characterized by further comprising a disconnection detection device of the dual-core current transformer according to any one of claims 6 to 10.
12. The circuit breaker according to claim 11, further comprising an indication circuit for indicating a detection result of the disconnection detecting means of the two-core current transformer.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110057310.7A CN112881946B (en) | 2021-01-15 | 2021-01-15 | Double-core current transformer disconnection detection method and device and circuit breaker |
| PCT/CN2021/136631 WO2022151877A1 (en) | 2021-01-15 | 2021-12-09 | Disconnection detection method and apparatus for dual-core current transformer, and breaker |
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| CN202110057310.7A CN112881946B (en) | 2021-01-15 | 2021-01-15 | Double-core current transformer disconnection detection method and device and circuit breaker |
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| CN112881946A CN112881946A (en) | 2021-06-01 |
| CN112881946B true CN112881946B (en) | 2021-09-24 |
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| CN112881946B (en) * | 2021-01-15 | 2021-09-24 | 常熟开关制造有限公司(原常熟开关厂） | Double-core current transformer disconnection detection method and device and circuit breaker |
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| WO2022151877A1 (en) | 2022-07-21 |
| CN112881946A (en) | 2021-06-01 |
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