CN112162217A - System for detecting leakage current of outgoing line of high-voltage switch cabinet - Google Patents
System for detecting leakage current of outgoing line of high-voltage switch cabinet Download PDFInfo
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- G—PHYSICS
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- 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
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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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
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Abstract
The invention discloses a system for realizing the detection of the outgoing line leakage current of a high-voltage switch cabinet, which comprises: the zero-sequence current signal operational amplifier conditioning circuit is coupled with the signal output end of a zero-sequence current transformer of the high-voltage switch cabinet; the zero-sequence voltage signal operational amplifier conditioning circuit is coupled with the signal output end of a zero-sequence voltage transformer of the high-voltage switch cabinet; the A/D conversion circuit is provided with a first interface, a second interface, a third interface and a fourth interface, the first interface is suitable for being coupled with the zero-sequence current signal operational amplifier conditioning circuit, and the second interface is suitable for being coupled with the zero-sequence voltage signal operational amplifier conditioning circuit; a signal processing circuit, one end of which is coupled with the third interface, and the other end of which is coupled with the line selection host; and one end of the synchronous signal interface circuit is coupled with the line selection host, and the other end of the synchronous signal interface circuit is coupled with the fourth interface. The design difficulty of the line selection host is greatly reduced, electromagnetic interference is avoided, time is saved, and potential safety hazards are avoided.
Description
Technical Field
The invention relates to the field of rail transit power equipment, in particular to a system for detecting outlet leakage current of a high-voltage switch cabinet.
Background
Most of power supply systems below 110KV in China adopt a mode that neutral points are not grounded or are grounded through arc suppression coils, and when the power supply systems are grounded through the arc suppression coils, grounding current is small. When a single-phase earth fault occurs, the low-current earth system has small fault current and can operate with a fault for a period of time, but the single-phase earth fault causes the normal phase voltage to be increased, and the fault is possibly expanded due to insulation breakdown, so that a fault line needs to be quickly detected and eliminated.
The traditional fault line is identified by a small-current grounding line selection device at present. The small current grounding line selection device is connected with the zero sequence current transformers of the outgoing lines of the switch cabinets through cables, collects collected zero sequence current analog quantities of all paths, performs analog-to-digital conversion, and adopts a line selection algorithm to identify fault lines.
The small current line selection device adopts a traditional analog quantity acquisition mode, and has the following problems and hidden dangers:
the zero sequence current analog quantity transmission is easy to be interfered by electromagnetic interference, especially a high-voltage substation with a high-intensity electromagnetic field;
the existing low-current line selection device generally has more lines, the positions of the junction boxes are different, and the cable laying is troublesome;
if the wiring is wrong, a series of complex processes such as power failure and the like are needed for line changing, time is delayed, manpower is consumed, and potential personal safety hazards are caused.
Therefore, a device which can realize zero sequence current detection on site to realize digital transmission of zero sequence current signals and meet the operation requirements of a novel digital small current line selection device is needed.
Disclosure of Invention
In order to solve the problems and requirements, the technical scheme provides a system for detecting the outgoing line leakage current of the high-voltage switch cabinet, and the technical purpose can be achieved by adopting the following technical characteristics, and other technical effects are brought.
The invention provides a system for realizing the detection of the outgoing line leakage current of a high-voltage switch cabinet, which comprises: the power supply circuit and the main line selection machine, wherein, the main line selection machine is used for gathering the zero sequence current/the amplitude and the phase signal of the zero sequence current/the voltage of each branch road of high-voltage board switch to discernment to the electric leakage state of each branch road zero sequence current/voltage signal, its characterized in that still includes:
the zero-sequence current signal operational amplifier conditioning circuit is coupled with the signal output end of a zero-sequence current transformer of the high-voltage switch cabinet, and is used for acquiring a zero-sequence current signal of the high-voltage switch cabinet and converting the zero-sequence current signal into an alternating current analog current source signal;
the zero-sequence voltage signal operational amplifier conditioning circuit is coupled with the signal output end of a zero-sequence voltage transformer of the high-voltage switch cabinet, and is used for acquiring a zero-sequence voltage signal of the high-voltage switch cabinet and converting the zero-sequence voltage signal into an alternating-current analog voltage source signal;
the A/D conversion circuit is provided with a first interface, a second interface, a third interface and a fourth interface, wherein the first interface is suitable for being coupled with the zero-sequence current signal operational amplifier conditioning circuit, and the second interface is suitable for being coupled with the zero-sequence voltage signal operational amplifier conditioning circuit and is used for converting an alternating current analog current source signal and an alternating current analog voltage source signal into an alternating current digital current source signal and an alternating current digital voltage source signal respectively;
a signal processing circuit, one end of which is coupled to the third interface and the other end of which is coupled to the line selection host, and configured to perform corresponding processing on the ac digital current source signal and the ac digital voltage source signal to obtain a zero sequence current amplitude and phase signal and a zero sequence voltage amplitude and phase signal, and upload the zero sequence current amplitude and phase signal and the zero sequence voltage amplitude and phase signal to the line selection host;
the synchronous signal interface circuit is coupled with the line selection host at one end and is coupled with the fourth interface at the other end, and is used for transmitting the sampling synchronous signals sent by the line selection host to the A/D conversion circuit so as to ensure the synchronous acquisition of the zero sequence current signals and the zero sequence voltage signals of the outgoing lines of the switch cabinets;
the power circuit is respectively coupled with the zero-sequence current signal operational amplifier conditioning circuit, the zero-sequence voltage signal operational amplifier conditioning circuit, the A/D conversion circuit, the signal processing circuit and the synchronous signal interface circuit.
In the technical scheme, the detection system can condition zero-sequence current and zero-sequence voltage signals, realize analog-to-digital conversion, and finally reliably transmit the signals to a line selection host machine after being preprocessed by a signal processing circuit; the line selection host provides sampling synchronous signals for the detection system, realizes the synchronous acquisition of zero sequence current signals of the outgoing lines of all switch cabinets, and ensures the time consistency of digital signals; the detection system plays a certain function of an edge server, changes the centralized signal processing in the traditional mode into distributed processing, greatly reduces the design difficulty of a line selection host, avoids electromagnetic interference, saves time and avoids potential safety hazards.
In addition, the system for detecting the outgoing line leakage current of the high-voltage switch cabinet, provided by the invention, can also have the following technical characteristics:
in one example of the present invention, the method further comprises:
and one end of the CAN-BUS interface circuit is coupled with the signal processing circuit, and the other end of the CAN-BUS interface circuit is coupled with the line selection host and used for transmitting the amplitude and phase signals of the zero-sequence current and the zero-sequence voltage to the line selection host.
In one example of the present invention, the method further comprises:
and one end of the first passive low-pass filter circuit is coupled with the zero-sequence current signal operational amplifier conditioning circuit, and the other end of the first passive low-pass filter circuit is coupled with the first interface and is used for filtering the alternating current analog current source signal.
In one example of the present invention, the method further comprises:
and one end of the second passive low-pass filter circuit is coupled with the zero-sequence voltage signal operational amplifier conditioning circuit, and the other end of the second passive low-pass filter circuit is coupled with the second interface and used for filtering the alternating-current analog voltage source signal.
In one example of the present invention, the method further comprises:
and the signal retainers are respectively configured at the first interface and the second interface and used for keeping the amplitude of the alternating current analog current source signal and the amplitude of the alternating current analog voltage source signal unchanged.
The following description of the preferred embodiments for carrying out the present invention will be made in detail with reference to the accompanying drawings so that the features and advantages of the present invention can be easily understood.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly described below. Wherein the drawings are only for purposes of illustrating some embodiments of the invention and are not to be construed as limiting the invention to all embodiments thereof.
Fig. 1 is a schematic block diagram of a system for detecting leakage current of an outgoing line of a high-voltage switch cabinet according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a zero-sequence current signal operational amplifier conditioning circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a zero sequence voltage signal operational amplifier conditioning circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a first passive low pass filter circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a second passive low pass filter circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an A/D conversion circuit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a synchronization signal interface circuit according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a signal processing circuit according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a CAN-BUS interface circuit according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a power supply circuit according to an embodiment of the invention.
List of reference numerals:
a detection system 100;
a zero-sequence current signal operational amplifier conditioning circuit 101;
a zero sequence voltage signal operational amplifier conditioning circuit 102;
an a/D conversion circuit 103;
a first interface 1031;
a second interface 1032;
a third interface 1033;
a fourth interface 1034;
a signal processing circuit 104;
a synchronization signal interface circuit 105;
a CAN-BUS interface circuit 106;
a first passive low-pass filter circuit 107;
a second passive low pass filter circuit 108.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments of the present invention. Like reference symbols in the various drawings indicate like elements. It should be noted that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
The invention discloses a system 100 for realizing the detection of the outgoing line leakage current of a high-voltage switch cabinet, which comprises: the detection system comprises a power circuit and a line selection host, wherein the line selection host is used for acquiring amplitude and phase signals of zero-sequence current/voltage of each branch of a high-voltage cabinet switch and identifying the leakage state of the zero-sequence current/voltage signal of each branch, as shown in fig. 10, the power circuit in the detection system 100 adopts direct current 12V as a power supply, firstly converts the direct current into stable 3.3V direct current through K7803M-1000R3 as a main power supply of the circuit, and provides the stable 3.3V direct current to an A/D conversion circuit 103, a single chip circuit, a CAN-BUS interface circuit 106 and a synchronous signal circuit. 3.3V direct current passes through a DC-DC converter A0312XT-1WR2 to generate a power supply for a +/-12V analog circuit, and the power supply is supplied to an operational amplifier conditioning circuit; the +12V is converted into +5V through 78L05G-AB3-R to be used as an analog power supply of the A/D chip. As shown in fig. 1, the method further includes:
the zero-sequence current signal operational amplifier conditioning circuit 101 is coupled with a signal output end of a zero-sequence current transformer of the high-voltage switch cabinet, and is used for acquiring a zero-sequence current signal of the high-voltage switch cabinet and converting the zero-sequence current signal into an alternating current analog current source signal; specifically, as shown in fig. 2, the signal output of the zero sequence current transformer of the high voltage switch cabinet is connected to a connection terminal P1, converted into a small current signal of mA level through a micro current transformer T1, and converted into a voltage signal (I0-0) through an inverting amplifier composed of U1.
The zero sequence voltage signal operational amplifier conditioning circuit 102 is coupled to a signal output end of a zero sequence voltage transformer of the high-voltage switch cabinet, and is used for acquiring a zero sequence voltage signal of the high-voltage switch cabinet and converting the zero sequence voltage signal into an alternating current analog voltage source signal; specifically, as shown in fig. 3, a PT cabinet zero-sequence voltage signal of a bus where the high-voltage switch cabinet is located is connected to a connection terminal P2, and the voltage signal passes through a resistor R10 to form a mA-level small current signal, passes through a micro current transformer T2 to be converted into a mA-level small current signal in an equal proportion, and passes through an inverting amplifier formed by U3 to be converted into a voltage signal (U0-0).
The a/D conversion circuit 103 has a first interface 1031, a second interface 1032, a third interface 1033, and a fourth interface 1034, the first interface 1031 is adapted to be coupled to the zero-sequence current signal operational amplifier conditioning circuit 101, the second interface 1032 is adapted to be coupled to the zero-sequence voltage signal operational amplifier conditioning circuit 102, and is configured to convert the ac analog current source signal and the ac analog voltage source signal into an ac digital current source signal and an ac digital voltage source signal, respectively; specifically, as shown in fig. 6, the AD7606BSTZ is used as the analog-to-digital converter of the detection system 100, and an 8-channel sample holder (T/H) is built in the device, so as to meet the requirement of sampling and holding the ac analog signal.
AD7606BSTZ is powered by a 5V single power supply, and can process true bipolar input signals; the high or low level is given through a RANGE pin, so that the switching of +/-10V or +/-5V two RANGEs can be realized; AD7606BSTZ has a high-speed parallel interface with 16bit width, and can be directly connected with an off-chip memory interface of an interface microprocessor; in order to save the use of IO lines, a high-speed SPI interface is adopted, and 1 data output port is used for the SPI interface.
The AD7606BSTZ works as follows: the single chip microcomputer sends a pulse signal to an ADC _ CNT pin, an AD samples and holds a signal of an analog input terminal, a converter is started, and a BUSY pin of a conversion device AD is in a high level; after AD conversion is finished, the level of the BUSY pin of the AD is changed to be low, the single chip microcomputer detects the low level, the SPI is continuously carried out for 8 times of reading operation with 16bit width, and data of 8 channels are sequentially read.
A signal processing circuit 104, one end of which is coupled to the third interface 1033, and the other end of which is coupled to the line selection host, and configured to perform corresponding processing on the ac digital current source signal and the ac digital voltage source signal to obtain a zero sequence current amplitude and phase signal and a zero sequence voltage amplitude and phase signal, and upload the zero sequence current amplitude and phase signal and the zero sequence voltage amplitude and phase signal to the line selection host; specifically, as shown in fig. 8, the core element of the signal processing circuit 104 adopts an STM32F103C8T6 single chip microcomputer, and an STM32 series 32-bit flash memory microcontroller uses a breakthrough Cortex-M3 core from ARM corporation, which is specially designed to meet the requirements of an embedded field integrating high performance, low power consumption, real-time application and competitive price. The singlechip chip is connected with the A/D conversion circuit 103, the CAN-BUS interface circuit 106 and the synchronous signal circuit; in addition, the singlechip is also connected with an address dial switch S1, and the address configuration data is acquired by reading the state of the dial switch, so that the networking communication ID is acquired. The global ADC _ CNT _0 signal transmitted by the synchronous signal circuit is transmitted in a long distance, so that certain interference may exist, the single chip microcomputer automatically corrects the disturbance, and then an accurate A/D synchronous sampling signal ADC _ CNT is output to the A/D chip. After the singlechip reads the data of the A/D chip, the digital processing is carried out: filtering, fourier transform, etc., to obtain the amplitude and phase (relative zero sequence voltage) of the zero sequence current, and then sending to the line selection host through the CAN-BUS interface circuit 106.
A synchronous signal interface circuit 105, one end of which is coupled to the line selection host, and the other end of which is coupled to the fourth interface 1034, and configured to transmit the sampled synchronous signal sent by the line selection host to the a/D conversion circuit 103, so as to ensure synchronous acquisition of the zero-sequence current signal and the zero-sequence voltage signal of the outgoing line of each switch cabinet; specifically, as shown in fig. 7, the line selection master sends out a global synchronous clock signal through the synchronous signal interface circuit 105, wherein the signal is in the form of a differential signal and is transmitted to the P4 terminal of the circuit module through the twisted pair line. The U5 model is TD301D485H-A, and in a signal receiving state, the U5 can convert the differential signal into a TTL signal. The TTL signal, as a sample, is provided to the a/D conversion circuit 103 to start analog-to-digital conversion after being dithered by the single chip circuit, thereby realizing time consistency of analog signal conversion.
The power circuit is coupled to the zero-sequence current signal operational amplifier conditioning circuit 101, the zero-sequence voltage signal operational amplifier conditioning circuit 102, the a/D conversion circuit 103, the signal processing circuit 104, and the synchronization signal interface circuit 105.
The detection system 100 can condition zero-sequence current and zero-sequence voltage signals, realize analog-to-digital conversion, and finally reliably transmit the signals to a line selection host machine after being preprocessed by the signal processing circuit 104; the line selection host provides sampling synchronous signals for the detection system 100, realizes synchronous acquisition of zero sequence current signals of outgoing lines of all switch cabinets, and ensures time consistency of digital signals; the detection system 100 has a certain function of an edge server, changes the centralized signal processing in the traditional mode into distributed processing, greatly reduces the design difficulty of a line selection host, avoids electromagnetic interference, saves time and avoids potential safety hazards.
In one example of the present invention, the method further comprises:
a CAN-BUS interface circuit 106, one end of which is coupled to the signal processing circuit 104, and the other end of which is coupled to the line selection host, for transmitting the amplitude and phase signals of the zero-sequence current and the zero-sequence voltage to the line selection host;
specifically, as shown in fig. 9, the CAN-BUS adopts a two-wire serial communication mode, and has a field BUS that forms an international standard and has the characteristics of high communication rate, strong error detection capability, easy implementation of work in a high-noise interference environment, high cost performance, and the like. The CAN-BUS is used in an industrial communication system, CAN enhance the communication reliability of the system, prolong the distance of the system, expand the node number of the system and enhance the real-time property of the system.
TD301DCANH is a high-speed isolated CAN transceiver with all necessary electrical components integrated inside, including isolation circuitry, CAN transceiver, bus protection, power supply circuitry, all integrated in modules smaller than 3 square centimeters. The main function of TD301DCANH is to convert the logic level of the CAN controller to the differential level of the CAN bus, and has (DC 2500V) isolation function, ESD protection function and TVS transistor protection against bus overvoltage.
In one example of the present invention, as shown in fig. 4, the method further includes:
and a first passive low-pass filter circuit 107, one end of which is coupled to the zero-sequence current signal operational amplifier conditioning circuit 101, and the other end of which is coupled to the first interface 1031, for filtering the ac analog current source signal.
In one example of the present invention, as shown in fig. 5, the method further includes:
and one end of the second passive low-pass filter circuit 108 is coupled to the zero-sequence voltage signal operational amplifier conditioning circuit 102, and the other end of the second passive low-pass filter circuit is coupled to the second interface 1032, and is configured to perform filtering processing on the alternating-current analog voltage source signal.
In one example of the present invention, the method further comprises:
signal holders respectively arranged at the first interface 1031 and the second interface 1032 for keeping the amplitude of the alternating current analog current source signal and the amplitude of the alternating current analog voltage source signal unchanged. Specifically, when analog-to-digital conversion is performed on an alternating current analog signal, the process is not performed at once, and a certain time needs to be reserved for acquisition and conversion of the AD element. During the sampling time, the amplitude of the ac analog signal must be kept constant, otherwise conversion errors may be caused. In order to ensure the synchronization of sampling of each signal and avoid errors, the amplitude of each signal needs to be maintained before a/D conversion, and thus a signal holder is required to be arranged at the a/D input terminal.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
The exemplary embodiment of the present invention for implementing the outlet leakage current detection system 100 of the high voltage switch cabinet has been described in detail with reference to the preferred embodiments, however, it will be understood by those skilled in the art that various modifications and changes may be made to the above specific embodiments without departing from the concept of the present invention, and various combinations of the various technical features and structures of the present invention may be implemented without departing from the scope of the present invention, which is defined by the appended claims.
Claims (5)
1. The utility model provides a realize high tension switchgear leakage current detection system that is qualified for next round of competitions, includes: the power supply circuit and the main line selection machine, wherein, the main line selection machine is used for gathering the zero sequence current/the amplitude and the phase signal of the zero sequence current/the voltage of each branch road of high-voltage board switch to discernment to the electric leakage state of each branch road zero sequence current/voltage signal, its characterized in that still includes: the zero-sequence current signal operational amplifier conditioning circuit (101) is coupled with the signal output end of a zero-sequence current transformer of the high-voltage switch cabinet and is used for acquiring a zero-sequence current signal of the high-voltage switch cabinet and converting the zero-sequence current signal into an alternating current analog current source signal; the zero sequence voltage signal operational amplifier conditioning circuit (102) is coupled with the signal output end of a zero sequence voltage transformer of the high-voltage switch cabinet and is used for acquiring a zero sequence voltage signal of the high-voltage switch cabinet and converting the zero sequence voltage signal into an alternating current analog voltage source signal; the A/D conversion circuit (103) is provided with a first interface (1031), a second interface (1032), a third interface (1033) and a fourth interface (1034), wherein the first interface (1031) is suitable for being coupled with the zero-sequence current signal operational amplifier conditioning circuit (101), and the second interface (1032) is suitable for being coupled with the zero-sequence voltage signal operational amplifier conditioning circuit (102) and is used for converting an alternating current analog current source signal and an alternating current analog voltage source signal into an alternating current digital current source signal and an alternating current digital voltage source signal respectively; a signal processing circuit (104), one end of which is coupled to the third interface (1033), and the other end of which is coupled to the line selection host, and configured to perform corresponding processing on the ac digital current source signal and the ac digital voltage source signal to obtain a zero sequence current amplitude and phase signal and a zero sequence voltage amplitude and phase signal, and upload the zero sequence current amplitude and phase signal and the zero sequence voltage amplitude and phase signal to the line selection host; a synchronous signal interface circuit (105), one end of which is coupled with the line selection host, and the other end of which is coupled with a fourth interface (1034), and is used for transmitting the sampling synchronous signal sent by the line selection host to the A/D conversion circuit (103) so as to ensure the synchronous acquisition of the zero sequence current signal and the zero sequence voltage signal of the outgoing line of each switch cabinet; the power circuit is respectively coupled with the zero-sequence current signal operational amplifier conditioning circuit (101), the zero-sequence voltage signal operational amplifier conditioning circuit (102), the A/D conversion circuit (103), the signal processing circuit (104) and the synchronous signal interface circuit (105).
2. The system for detecting leakage current of the outgoing line of the high-voltage switch cabinet as claimed in claim 1,
further comprising: and the CAN-BUS interface circuit (106) is coupled with the signal processing circuit (104) at one end and is coupled with the line selection host at the other end, and is used for transmitting the amplitude and phase signals of the zero-sequence current and the zero-sequence voltage to the line selection host.
3. The system for detecting leakage current of the outgoing line of the high-voltage switch cabinet as claimed in claim 1,
further comprising: and one end of the first passive low-pass filter circuit (107) is coupled with the zero-sequence current signal operational amplifier conditioning circuit (101), and the other end of the first passive low-pass filter circuit is coupled with the first interface (1031) and is used for filtering the alternating current analog current source signal.
4. The system for detecting leakage current of the outgoing line of the high-voltage switch cabinet as claimed in claim 1,
further comprising: and one end of the second passive low-pass filter circuit (108) is coupled with the zero-sequence voltage signal operational amplifier conditioning circuit (102), and the other end of the second passive low-pass filter circuit is coupled with the second interface (1032) and is used for filtering the alternating-current analog voltage source signal.
5. The system for detecting leakage current of the outgoing line of the high-voltage switch cabinet as claimed in claim 1,
further comprising: a signal holder arranged at the first interface (1031) and the second interface (1032), respectively, for holding the amplitude of the alternating current analog current source signal and the alternating current analog voltage source signal constant.
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| CN202011182159.1A CN112162217A (en) | 2020-10-29 | 2020-10-29 | System for detecting leakage current of outgoing line of high-voltage switch cabinet |
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