CN110632373A - Integrated intelligent low-voltage line monitoring device - Google Patents

Integrated intelligent low-voltage line monitoring device Download PDF

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Publication number
CN110632373A
CN110632373A CN201910794744.8A CN201910794744A CN110632373A CN 110632373 A CN110632373 A CN 110632373A CN 201910794744 A CN201910794744 A CN 201910794744A CN 110632373 A CN110632373 A CN 110632373A
Authority
CN
China
Prior art keywords
sensor
voltage
opening
unit
current
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
CN201910794744.8A
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Chinese (zh)
Inventor
胡顺
程超
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HANGZHOU CYLAN ELECTRONIC TECHNOLOGY Co Ltd
Original Assignee
HANGZHOU CYLAN ELECTRONIC TECHNOLOGY Co Ltd
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 HANGZHOU CYLAN ELECTRONIC TECHNOLOGY Co Ltd filed Critical HANGZHOU CYLAN ELECTRONIC TECHNOLOGY Co Ltd
Priority to CN201910794744.8A priority Critical patent/CN110632373A/en
Publication of CN110632373A publication Critical patent/CN110632373A/en
Pending legal-status Critical Current

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16533Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
    • G01R19/16538Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16571Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16576Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00Arrangements for measuring electric power or power factor
    • G01R21/127Arrangements for measuring electric power or power factor by using pulse modulation
    • G01R21/1271Measuring real or reactive component, measuring apparent energy
    • G01R21/1273Measuring real component
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00Arrangements for measuring electric power or power factor
    • G01R21/127Arrangements for measuring electric power or power factor by using pulse modulation
    • G01R21/1271Measuring real or reactive component, measuring apparent energy
    • G01R21/1275Measuring reactive component

Abstract

The invention belongs to the technical field of electricity, and particularly relates to an integrated intelligent low-voltage line monitoring device which comprises an opening measurement current sensor, an opening protection current sensor, a voltage sensor, a temperature sensor, a power supply unit, an intelligent monitoring unit and a communication unit, wherein the opening measurement current sensor is connected with the opening protection current sensor; the opening measure the current signal transmission of measurement that current sensor gathered extremely intelligent detection unit, the protection current signal transmission of opening protection current sensor gather extremely intelligent detection unit, the voltage signal transmission of voltage sensor gather extremely intelligent detection unit, the circuit temperature signal transmission of temperature sensor gather extremely intelligent detection unit, the communication unit be connected with intelligent monitoring unit, power supply unit provide working power supply for intelligent monitoring unit and communication unit. The technical scheme of the invention solves the problem of miniaturization and flexible monitoring of the low-voltage line.

Description

Integrated intelligent low-voltage line monitoring device
Technical Field
The invention belongs to the technical field of electricity, and particularly relates to an integrated intelligent low-voltage line monitoring device.
Background
The existing low-voltage line monitoring technical scheme mainly comprises a current sensor and a secondary monitoring device. In consideration of the measurement precision requirement and the protection wide dynamic range requirement, two different current transformers are often required to be respectively installed, and meanwhile, the measurement data of the secondary monitoring device is often an electric energy meter and a microcomputer protection device.
The disadvantages of this solution are: the device has the advantages of multiple parts, low integration level, high power consumption and complex installation and implementation. The intelligent monitoring and transformation work which needs to be carried out along with the development of the intelligent distribution network and the intelligent operation and maintenance management cannot be implemented at all.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides an integrated intelligent low-voltage line monitoring device and solves the problem of small and flexible low-voltage line monitoring.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: an integrated intelligent monitoring device for a low-voltage line comprises an opening measuring current sensor, an opening protection current sensor, a voltage sensor, a temperature sensor, a power supply unit, an intelligent monitoring unit and a communication unit; the intelligent detection device comprises an opening measurement current sensor, an intelligent detection unit, a voltage sensor, a power supply unit and a temperature sensor, wherein a measurement current signal acquired by the opening measurement current sensor is transmitted to the intelligent detection unit, a protection current signal acquired by the opening protection current sensor is transmitted to the intelligent detection unit, a voltage signal acquired by the voltage sensor is transmitted to the intelligent detection unit, a line temperature signal acquired by the temperature sensor is transmitted to the intelligent detection unit, the communication unit is connected with the intelligent monitoring unit, and the power supply unit provides a working power supply for the intelligent monitoring unit and the communication unit; the opening measurement current sensor, the opening protection current sensor, the voltage sensor, the temperature sensor, the power supply unit, the intelligent monitoring unit and the communication unit are integrated into a whole.
Preferably, the opening measuring current sensor provided by the invention adopts a measuring current opening structure made of a low-power consumption permalloy iron core, a sealing ring protection is designed on the measuring current opening structure, and a special anti-rust treatment is carried out on an opening tangent plane.
Preferably, the opening protection current sensor provided by the invention adopts a protection current opening structure manufactured by a flexible rogowski coil, and the protection current opening structure is a full-sealing structure without considering the treatment of a contact end face.
Preferably, the opening measuring current sensor and the opening protection current sensor are of an integrated opening structure, openings are formed in the same structural section, and the opening measuring current sensor and the opening protection current sensor can be mounted only by fastening once.
Preferably, the voltage sensor of the present invention is a current type voltage transformer, which isolates the measuring circuit from the measured line voltage, supports 2500V isolation voltage level, supports hot plugging of the voltage input terminal, and has: the L line (A/B/C phase) and the N line are two, and the L line can adopt a puncture type voltage acquisition mode.
Preferably, the temperature sensor of the invention is a miniaturized thermistor, directly contacts with a lead of a measured line, and is installed in the feed-through structure of the device.
Preferably, the power supply unit is an alternating current-direct current conversion power supply circuit, is compatible with direct current conversion of direct current 24V, 12V, 5V and 3.3V input, and provides a working power supply for the intelligent monitoring unit and the communication unit.
Preferably, the intelligent monitoring unit of the invention adopts a special electric energy metering chip and a single chip microcomputer. The intelligent monitoring unit carries out signal conditioning with the temperature signal of input, measurement current signal, protection current signal, voltage measurement signal, realizes the basic electric quantity monitoring of wide range high accuracy circuit monitoring point, includes: measuring current, voltage, protection current, active power, reactive power, shunt single-phase active electric energy and reactive electric energy. Meanwhile, real-time line state monitoring is realized, and the specific states comprise: the temperature of the cable contact surface of the circuit, an overcurrent state, a current loss state, an overvoltage state and an undervoltage state. The intelligent monitoring unit also provides the indication function of abnormal states such as overcurrent, overvoltage, current loss, undervoltage and the like
Preferably, the communication unit of the present invention includes a carrier communication module, a wireless communication module and a local RS485 communication module. The communication unit is the passageway that intelligent monitoring unit and external communication exchanged, and the communication protocol can adopt Modbus agreement, DL/T645 agreement or 101 agreement.
The invention has the beneficial effects that:
1) the technical scheme of the invention realizes a small-sized integrated monitoring device under a 400V low-voltage line, has light weight and small volume, and basically has no wiring workload because cables in various low-voltage power distribution cabinets are directly sleeved and used in an opening way.
2) The integrated monitoring device realized by the technical scheme of the invention has high integration level, and the interfaces of the sensor and the intelligent monitoring device are mV level small signals instead of 1A and 5A large signals output by the traditional mutual inductor, so the power consumption is lower.
3) The integrated monitoring device realized by the technical scheme of the invention is directly clamped on the measured line without changing the operation site during field installation, and the transformation and installation operation is simple and convenient.
Drawings
Fig. 1 is a block diagram of the modular concept of the apparatus of the present invention.
Detailed Description
As shown in fig. 1, the integrated intelligent monitoring device for the low-voltage line comprises an opening measurement current sensor, an opening protection current sensor, a voltage sensor, a temperature sensor, a power supply unit, an intelligent monitoring unit and a communication unit; the intelligent detection device comprises an opening measurement current sensor, an intelligent detection unit, a voltage sensor, a power supply unit and a temperature sensor, wherein a measurement current signal acquired by the opening measurement current sensor is transmitted to the intelligent detection unit, a protection current signal acquired by the opening protection current sensor is transmitted to the intelligent detection unit, a voltage signal acquired by the voltage sensor is transmitted to the intelligent detection unit, a line temperature signal acquired by the temperature sensor is transmitted to the intelligent detection unit, the communication unit is connected with the intelligent monitoring unit, and the power supply unit provides a working power supply for the intelligent monitoring unit and the communication unit; the opening measurement current sensor, the opening protection current sensor, the voltage sensor, the temperature sensor, the power supply unit, the intelligent monitoring unit and the communication unit are integrated into a whole.
Preferably, the opening measuring current sensor provided by the invention adopts a measuring current opening structure made of a low-power consumption permalloy iron core, a sealing ring protection is designed on the measuring current opening structure, and a special anti-rust treatment is carried out on an opening tangent plane.
Preferably, the opening protection current sensor provided by the invention adopts a protection current opening structure manufactured by a flexible rogowski coil, and the protection current opening structure is a full-sealing structure without considering the treatment of a contact end face.
Preferably, the opening measuring current sensor and the opening protection current sensor are of an integrated opening structure, openings are formed in the same structural section, and the opening measuring current sensor and the opening protection current sensor can be mounted only by fastening once.
Preferably, the voltage sensor of the present invention is a current type voltage transformer, which isolates the measuring circuit from the measured line voltage, supports 2500V isolation voltage level, supports hot plugging of the voltage input terminal, and has: the L line (A/B/C phase) and the N line are two, and the L line can adopt a puncture type voltage acquisition mode.
Preferably, the temperature sensor of the invention is a miniaturized thermistor, directly contacts with a lead of a measured line, and is installed in the feed-through structure of the device.
Preferably, the power supply unit is an alternating current-direct current conversion power supply circuit, is compatible with direct current conversion of direct current 12V, 5V and 3.3V input, and provides a working power supply for the intelligent monitoring unit and the communication unit.
Preferably, the intelligent monitoring unit of the invention adopts a special electric energy metering chip and a single chip microcomputer. The intelligent monitoring unit carries out signal conditioning with the temperature signal of input, measurement current signal, protection current signal, voltage measurement signal, realizes the basic electric quantity monitoring of wide range high accuracy circuit monitoring point, includes: measuring current, voltage, protection current, active power, reactive power, shunt single-phase active electric energy and reactive electric energy. Meanwhile, real-time line state monitoring is realized, and the specific states comprise: the temperature of the cable contact surface of the circuit, an overcurrent state, a current loss state, an overvoltage state and an undervoltage state. The intelligent monitoring unit also provides the indication function of abnormal states such as overcurrent, overvoltage, current loss, undervoltage and the like
Preferably, the communication unit of the present invention includes a carrier communication module, a wireless communication module and a local RS485 communication module. The communication unit is the passageway that intelligent monitoring unit and external communication exchanged, and the communication protocol can adopt Modbus agreement, DL/T645 agreement or 101 agreement.
The L line (A/B/C) and the N line of the 220V phase voltage of the low-voltage line of the transformer are connected into the integrated low-voltage line intelligent monitoring device, the overload voltage capability can continuously work for a long time under 1.2 times of rated voltage, and the voltage measurement error is less than 0.5 percent. And can operate for more than 10 seconds at 1.4 times the rated voltage.
The primary rated current of the opening measuring current sensor is 600A, the secondary rated current is 200mA, and the accuracy of the sensor is +/-0.5%.
The primary rated current of the opening measuring current sensor is 4000A, the secondary rated current is 400mA, and the accuracy of the sensor is +/-2%.
The temperature sensor is a miniaturized thermistor, more particularly a bead-shaped NTC thermistor with a high B value, and has a fast temperature response speed.
The power supply unit adopts a wide-range alternating current-direct current conversion module (AC/DC) and a direct current-direct current conversion module (DC/DC), the alternating current input range is 65V to 260V, and the direct current output is 24V and 12V; the output of the direct current conversion module is 5V and 3.3V, and the output is provided for the intelligent monitoring unit and the communication unit.
The intelligent monitoring unit adopts a special electric energy metering chip and a single chip microcomputer, and has the main functions of sampling signals such as voltage, current, temperature and the like and calculating power and electric energy in real time. And meanwhile, real-time analysis is carried out on the monitoring data, and once the protection measurement current exceeds the fault indication action current, a fault indication function is started. And once the voltage exceeds and is lower than the normal operation voltage range, abnormal information indicating voltage over-bound and voltage drop is started.
The communication unit comprises a carrier communication module, a wireless communication module and a local RS485 communication module, and can automatically configure a communication channel according to the actual situation on site. The communication protocol can adopt a Modbus protocol, a DL/T645 protocol or a 101 protocol, and the type of the protocol can be selected according to the actual system configuration requirement.
The invention has the beneficial effects that:
4) the technical scheme of the invention realizes a small-sized integrated monitoring device under a 400V low-voltage line, has light weight and small volume, and basically has no wiring workload because cables in various low-voltage power distribution cabinets are directly sleeved and used in an opening way.
5) The integrated monitoring device realized by the technical scheme of the invention has high integration level, and the interfaces of the sensor and the intelligent monitoring device are mV level small signals instead of 1A and 5A large signals output by the traditional mutual inductor, so the power consumption is lower.
6) The integrated monitoring device realized by the technical scheme of the invention is directly clamped on the measured line without changing the operation site during field installation, and the transformation and installation operation is simple and convenient.

Claims (8)

1. An integrated intelligent monitoring device for a low-voltage line is characterized by comprising an opening measurement current sensor, an opening protection current sensor, a voltage sensor, a temperature sensor, a power supply unit, an intelligent monitoring unit and a communication unit; the intelligent detection device comprises an opening measurement current sensor, an intelligent detection unit, a voltage sensor, a power supply unit and a temperature sensor, wherein a measurement current signal acquired by the opening measurement current sensor is transmitted to the intelligent detection unit, a protection current signal acquired by the opening protection current sensor is transmitted to the intelligent detection unit, a voltage signal acquired by the voltage sensor is transmitted to the intelligent detection unit, a line temperature signal acquired by the temperature sensor is transmitted to the intelligent detection unit, the communication unit is connected with the intelligent monitoring unit, and the power supply unit provides a working power supply for the intelligent monitoring unit and the communication unit; the opening measurement current sensor, the opening protection current sensor, the voltage sensor, the temperature sensor, the power supply unit, the intelligent monitoring unit and the communication unit are integrated into a whole.
2. The intelligent integrated low-voltage line monitoring device according to claim 1, wherein the opening current measuring sensor is a current measuring opening structure made of a low-power consumption permalloy iron core, a sealing ring protection is designed on the current measuring opening structure, and a special anti-rust treatment is performed on an opening section.
3. The intelligent monitoring device of claim 1, wherein the open protection current sensor is a protection current open structure made of flexible rogowski coils, and the protection current structure is a full-sealed structure.
4. The intelligent monitoring device of claim 1, wherein the opening measuring current sensor and the opening protection current sensor are of an integrated opening structure and are opened on the same structural section.
5. The integrated intelligent monitoring device for the low-voltage line as claimed in claim 1, wherein the voltage sensor is a current type voltage transformer, the measuring circuit is isolated from the measured line voltage, the 2500V isolation voltage level is supported, and hot plugging and unplugging of a voltage input end are supported.
6. The integrated intelligent monitoring device for the low-voltage line as claimed in claim 1, wherein the temperature sensor is a miniaturized thermistor and directly contacts with a lead of a line to be detected.
7. The integrated intelligent monitoring device for the low-voltage line according to claim 1, wherein the power supply unit is an alternating-current/direct-current conversion power supply circuit which is compatible with direct-current conversion of direct-current 24V, 12V, 5V and 3.3V inputs and provides working power supply for the intelligent monitoring unit and the communication unit. The integrated intelligent monitoring device for the low-voltage line of claim 1, wherein the intelligent monitoring unit adopts a special electric energy metering chip and a single chip microcomputer.
8. The integrated intelligent monitoring device for the low-voltage line as claimed in claim 1, wherein the communication unit comprises a carrier communication module, a wireless communication module and a local RS485 communication module.
CN201910794744.8A 2019-08-27 2019-08-27 Integrated intelligent low-voltage line monitoring device Pending CN110632373A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910794744.8A CN110632373A (en) 2019-08-27 2019-08-27 Integrated intelligent low-voltage line monitoring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910794744.8A CN110632373A (en) 2019-08-27 2019-08-27 Integrated intelligent low-voltage line monitoring device

Publications (1)

Publication Number Publication Date
CN110632373A true CN110632373A (en) 2019-12-31

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Country Status (1)

Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112509299A (en) * 2020-11-11 2021-03-16 广东雅达电子股份有限公司 Wireless temperature device supporting CT power taking of high-voltage power distribution cabinet

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112509299A (en) * 2020-11-11 2021-03-16 广东雅达电子股份有限公司 Wireless temperature device supporting CT power taking of high-voltage power distribution cabinet

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