CN112924746A - Device and method for measuring phase voltage of high-voltage cable terminal head - Google Patents
Device and method for measuring phase voltage of high-voltage cable terminal head Download PDFInfo
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- CN112924746A CN112924746A CN202110128302.7A CN202110128302A CN112924746A CN 112924746 A CN112924746 A CN 112924746A CN 202110128302 A CN202110128302 A CN 202110128302A CN 112924746 A CN112924746 A CN 112924746A
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 63
- 229910052751 metal Inorganic materials 0.000 claims abstract description 63
- 238000001514 detection method Methods 0.000 claims abstract description 48
- 239000003990 capacitor Substances 0.000 claims abstract description 26
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 238000004891 communication Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000011889 copper foil Substances 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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- 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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/04—Voltage dividers
- G01R15/06—Voltage dividers having reactive components, e.g. capacitive transformer
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Abstract
The invention discloses a high-voltage cable terminal end phase voltage measuring device which comprises a sensor polar plate, an insulating rubber layer, a metal shielding layer, a voltage detection module, a voltage transmission module and a power supply module, wherein the sensor polar plate is wrapped on a high-voltage cable, the insulating rubber layer is wrapped on the sensor polar plate, the metal shielding layer is covered on the insulating rubber layer, the metal shielding layer is grounded, two ends of the voltage detection module are respectively connected with the sensor polar plate and the metal shielding layer through leads so as to detect the voltage at two ends of a voltage-dividing capacitor, and the voltage transmission module is electrically connected with the voltage detection module. The measuring device has the advantages of small volume, convenient assembly and disassembly, no need of damaging the structure of the high-voltage cable, safety and capability of reducing the problems of short circuit and the like of the line. The interference of temperature, humidity and electromagnetism in the detection process is small, and the measurement precision is high. Through multiple experiments, the measurement error of the phase voltage is less than 0.5%.
Description
Technical Field
The invention relates to the technical field of electric power overhaul, in particular to a device and a method for measuring a high-voltage cable terminal phase voltage.
Background
In recent years, the urbanization development of China is accelerated, high-voltage cables are developed rapidly, and the traditional overhead conductor cannot meet the power utilization requirements of the existing national power. High voltage cables are usually laid underground, and conventional high voltage sensors and non-contact high voltage sensors are usually used for detecting the voltage of the high voltage cables. The traditional high-voltage sensor is a primary side device, a main loop is connected in series to enter the loop, and the measured voltage is line voltage. The non-contact measurement voltage is phase voltage, and the measurement principle is that series capacitors divide voltage, so that the influence of temperature and humidity on ground capacitance and the influence of surrounding electromagnetic field change on ground capacitance of a high-voltage line are large, and the accuracy of wire voltage measurement cannot be guaranteed.
Disclosure of Invention
In view of the above, it is necessary to provide a high-voltage cable terminal phase voltage measuring device with high measurement accuracy and easy installation.
It is also necessary to provide a method for measuring the phase voltage of the high-voltage cable termination.
The utility model provides a high tension cable terminal end looks voltage measuring device includes sensor polar plate, insulating rubber layer, metal shielding layer, voltage detection module, voltage transmission module, power module, the sensor polar plate parcel is on high tension cable, and insulating rubber layer parcel is on the sensor polar plate, and the metal shielding layer covers on the insulating rubber layer, and metal shielding layer ground connection, and the both ends of voltage detection module pass through the wire with sensor polar plate, metal shielding layer respectively and are connected to detect voltage, voltage transmission module and the voltage detection module electric connection at partial pressure electric capacity both ends, with the voltage signal transmission to the remote control terminal that gathers voltage detection module.
Preferably, the voltage detection module comprises a voltage-dividing capacitor and a voltage detection circuit, wherein two ends of the voltage-dividing capacitor are respectively connected with the sensor electrode plate and the metal shielding layer through leads, and the voltage detection circuit is connected with the voltage-dividing capacitor in parallel to detect voltages at two ends of the voltage-dividing capacitor.
Preferably, the voltage transmission module comprises a digital-to-analog conversion module and a communication module, the digital-to-analog conversion module is electrically connected with the voltage detection module to convert analog signals of the voltage collected by the voltage detection module into digital signals, and the communication module is connected with an external remote control terminal to transmit the digital signals of the voltage to the remote control terminal.
Preferably, the high-voltage cable terminal phase voltage measuring device further comprises a GPS antenna for positioning the high-voltage cable terminal phase voltage measuring device.
Preferably, the power module comprises a solar panel and a standby power supply so as to stably output power.
Preferably, the sensor plate is a copper foil.
Preferably, the metal shielding layer is a cuboid hollow metal shell, and a drain hole is formed in the bottom of the metal shell to prevent water vapor in the air from being accumulated in the metal shell after being condensed.
A method for measuring a phase voltage of a high-voltage cable terminal comprises the following steps:
step S001, cleaning and wiping the outermost insulating layer of the cable terminal to be detected to prevent dust and impurities from affecting voltage detection;
s002, tightly wrapping the sensor polar plate on an insulating layer of the cable terminal to ensure that the sensor polar plate and a high-voltage cable core wire keep an insulating state;
step S003, wrapping the insulating rubber layer on the sensor pole plate, and placing the cable terminal containing the sensor pole plate and the insulating rubber layer section in the metal shielding layer, wherein one side of the metal shielding layer containing the water drainage hole is positioned at the bottom of the metal shielding layer;
step S004, connecting two access ends of a voltage detection module with the sensor polar plate and the metal shielding layer respectively through leads so as to detect the voltage between the sensor polar plate and the metal shielding layer;
step S005, calculating the phase voltage of the high-voltage cable terminal and the phase voltage of the high-voltage cable terminal
Wherein, C1Is the capacitance, C, between the high-voltage cable core and the cable metal sheath2Is the capacitance value of a voltage-dividing capacitor, U2The voltage between two ends of the voltage-dividing capacitor, namely the voltage between the polar plate of the detection sensor and the metal shielding layer.
Has the advantages that: the invention discloses a high-voltage cable terminal end phase voltage measuring device which comprises a sensor polar plate, an insulating rubber layer, a metal shielding layer, a voltage detection module, a voltage transmission module and a power supply module, wherein the sensor polar plate is wrapped on a high-voltage cable, the insulating rubber layer is wrapped on the sensor polar plate, the metal shielding layer is covered on the insulating rubber layer and is grounded, two ends of the voltage detection module are respectively connected with the sensor polar plate and the metal shielding layer through leads so as to detect voltages at two ends of a voltage-dividing capacitor, and the voltage transmission module is electrically connected with the voltage detection module so as to transmit voltage signals collected by the voltage detection module to a remote control terminal. Compared with the traditional contact type voltage sensor, the measuring device disclosed by the invention is small in size, very convenient to mount and dismount, and free from damaging the structure of a high-voltage cable, so that the measuring device is safer, and the problems of short circuit and the like of a line are reduced. Compared with a traditional non-contact voltage sensor, the voltage value of the fixed capacitor is detected, the insulating rubber layer and the metal shielding layer are arranged, interference of temperature, humidity and electromagnetism in the detection process is small, and the measurement accuracy is high. Through multiple experiments, the measurement error of the phase voltage is less than 0.5%.
Drawings
Fig. 1 is a schematic view of an installation structure of a high-voltage cable terminal phase voltage measuring device according to the present invention.
Fig. 2 is a detection state diagram of the high-voltage cable terminal phase voltage measuring device of the present invention.
Fig. 3 is a functional block diagram of the high-voltage cable terminal phase voltage measuring device of the present invention.
In the figure: the device comprises a high-voltage cable terminal phase voltage measuring device 10, a sensor polar plate 20, an insulating rubber layer 30, a metal shielding layer 40, a water drainage hole 401, a voltage detection module 50, a voltage transmission module 60, a digital-to-analog conversion module 601, a communication module 602, a power supply module 70 and a GPS antenna 80.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Referring to fig. 1 to 3, the high-voltage cable terminal end phase voltage measuring device 10 includes a sensor plate 20, an insulating rubber layer 30, a metal shielding layer 40, a voltage detection module 50, a voltage transmission module 60, and a power module 70, where the sensor plate 20 is wrapped on the high-voltage cable, the insulating rubber layer 30 is wrapped on the sensor plate 20, the metal shielding layer 40 is covered on the insulating rubber layer 30, the metal shielding layer 40 is grounded, two ends of the voltage detection module 50 are respectively connected with the sensor plate 20 and the metal shielding layer 40 through wires to detect voltages at two ends of a voltage-dividing capacitor, and the voltage transmission module 60 is electrically connected with the voltage detection module 50 to transmit voltage signals collected by the voltage detection module 50 to a remote control terminal.
The insulating rubber layer 30 can effectively isolate the connection between the metal shielding layer 40 and the sensor polar plate 20, prevent the short circuit between the metal shielding layer 40 and the sensor polar plate 20, and simultaneously, can also isolate the sensor polar plate 20, reduce the influence of temperature and humidity on voltage detection in the environment.
Further, the voltage detection module 50 includes a voltage-dividing capacitor and a voltage detection circuit, two ends of the voltage-dividing capacitor are respectively connected with the sensor electrode plate 20 and the metal shielding layer 40 through wires, and the voltage detection circuit is connected in parallel with the voltage-dividing capacitor to detect voltages at two ends of the voltage-dividing capacitor.
The voltage between the sensor plate 20 and the metal shielding layer 40 is the ground voltage of the sensor plate 20. As is well known, voltage and capacitance are inversely proportional. The high-voltage cable core and the capacitance between the high-voltage cable core and the cable metal sheath can be found through an operation manual, and the voltage-dividing capacitance is known, so that the voltage between the high-voltage cable and the ground can be obtained through detecting the voltage at two ends of the voltage-dividing capacitance and calculating. Because the capacitance value of the voltage-dividing capacitor is fixed, the influence of the interphase electromagnetic coupling on the measurement precision is reduced through the metal shielding layer 40, the influence of the humidity and the temperature on the voltage is reduced through the insulating rubber layer 30, the voltage of the voltage-dividing capacitor belongs to low potential voltage, and the measured voltage precision at two ends of the voltage-dividing capacitor is higher.
Further, the voltage transmission module 60 includes a digital-to-analog conversion module 601 and a communication module 602, the digital-to-analog conversion module 601 is electrically connected to the voltage detection module 50 to convert an analog signal of the voltage collected by the voltage detection module 50 into a digital signal, and the communication module 602 is connected to an external remote control terminal to transmit the digital signal of the voltage to the remote control terminal.
Further, the high-voltage cable terminal phase voltage measuring device 10 further includes a GPS antenna 80 to locate the high-voltage cable terminal phase voltage measuring device 10.
Further, the power module 70 includes a solar panel and a standby power source to stabilize output power.
Further, the sensor plate 20 is a copper foil.
Further, the metal shielding layer 40 is a cuboid hollow metal shell, and a drain hole 401 is formed in the bottom of the metal shell to prevent water vapor in the air from being accumulated in the metal shell after being condensed.
Furthermore, the invention also provides a measuring method for measuring the high-voltage cable terminal phase voltage by the high-voltage cable terminal phase voltage measuring device, which comprises the following detailed steps:
step S001, cleaning and wiping the outermost insulating layer of the cable terminal to be detected to prevent dust and impurities from affecting voltage detection;
step S002, tightly wrapping the sensor polar plate 20 on an insulating layer of a cable terminal, and ensuring that the sensor polar plate 20 and a high-voltage cable core wire keep an insulating state;
the sensor plate 20 is wrapped on the insulating layer of the cable terminal, so that the situation that the measuring circuit or the communication module 602 is burnt due to overlarge voltage can be prevented.
Step S003, wrapping the insulating rubber layer 30 on the sensor polar plate 20, and placing a cable terminal containing the sensor polar plate 20 and the insulating rubber layer 30 section in the metal shielding layer 40, wherein one side of the metal shielding layer 40 containing the water drainage hole 401 is positioned at the bottom of the metal shielding layer 40;
in actual field, the environment is complex, and the electromagnetic interference is also complex, and the metal shielding layer 40 can effectively reduce the measurement error caused by the electromagnetic interference.
Step S004, connecting two access ends of the voltage detection module 50 with the sensor plate 20 and the metal shielding layer 40 through wires, respectively, to detect a voltage between the sensor plate 20 and the metal shielding layer 40;
step S005, calculating the phase voltage of the high-voltage cable terminal and the phase voltage of the high-voltage cable terminal
Wherein, C1For the capacitance between the core wire of the high-voltage cable and the metal sheath of the cable，C2Is the capacitance value of a voltage-dividing capacitor, U2The voltage between two ends of the voltage-dividing capacitor, namely the voltage between the polar plate of the detection sensor and the metal shielding layer.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (8)
1. The utility model provides a high tension cable terminal looks voltage measuring device which characterized in that: including sensor polar plate, insulating rubber layer, metal shielding layer, voltage detection module, voltage transmission module, power module, the sensor polar plate parcel is on high tension cable, and insulating rubber layer parcel is on the sensor polar plate, and the metal shielding layer covers on insulating rubber layer, and metal shielding layer ground connection, and the both ends of voltage detection module pass through the wire with sensor polar plate, metal shielding layer respectively and are connected to detect voltage, voltage transmission module and the voltage detection module electric connection at partial pressure electric capacity both ends, in order to transmit the voltage signal that voltage detection module gathered to remote control terminal.
2. The high voltage cable termination phase voltage measurement device of claim 1, wherein: the voltage detection module comprises a voltage division capacitor and a voltage detection circuit, wherein two ends of the voltage division capacitor are respectively connected with the sensor pole plate and the metal shielding layer through leads, and the voltage detection circuit is connected with the voltage division capacitor in parallel so as to detect the voltage at two ends of the voltage division capacitor.
3. The high voltage cable termination phase voltage measurement device of claim 1, wherein: the voltage transmission module comprises a digital-to-analog conversion module and a communication module, the digital-to-analog conversion module is electrically connected with the voltage detection module to convert analog signals of the voltage collected by the voltage detection module into digital signals, and the communication module is connected with an external remote control terminal to transmit the digital signals of the voltage to the remote control terminal.
4. The high voltage cable termination phase voltage measurement device of claim 1, wherein: the high-voltage cable terminal phase voltage measuring device further comprises a GPS antenna so as to position the high-voltage cable terminal phase voltage measuring device.
5. The high voltage cable termination phase voltage measurement device of claim 1, wherein: the power module comprises a solar cell panel and a standby power supply so as to stably output power.
6. The high voltage cable termination phase voltage measurement device of claim 1, wherein: the sensor polar plate is a copper foil.
7. The high voltage cable termination phase voltage measurement device of claim 1, wherein: the metal shielding layer is a cuboid hollow metal shell, and a drain hole is formed in the bottom of the metal shell to prevent water vapor in the air from being accumulated in the metal shell after being condensed.
8. A method for measuring a phase voltage of a high-voltage cable terminal is characterized by comprising the following steps: the method comprises the following steps:
step S001, cleaning and wiping the outermost insulating layer of the cable terminal to be detected to prevent dust and impurities from affecting voltage detection;
s002, tightly wrapping the sensor polar plate on an insulating layer of the cable terminal to ensure that the sensor polar plate and a high-voltage cable core wire keep an insulating state;
step S003, wrapping the insulating rubber layer on the sensor pole plate, and placing the cable terminal containing the sensor pole plate and the insulating rubber layer section in the metal shielding layer, wherein one side of the metal shielding layer containing the water drainage hole is positioned at the bottom of the metal shielding layer;
step S004, connecting two access ends of a voltage detection module with the sensor polar plate and the metal shielding layer respectively through leads so as to detect the voltage between the sensor polar plate and the metal shielding layer;
step S005, calculating the phase voltage of the high-voltage cable terminal and the phase voltage of the high-voltage cable terminal
Wherein, C1Is the capacitance, C, between the high-voltage cable core and the cable metal sheath2Is the capacitance value of a voltage-dividing capacitor, U2The voltage between two ends of the voltage-dividing capacitor, namely the voltage between the polar plate of the detection sensor and the metal shielding layer.
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| CN202110128302.7A CN112924746A (en) | 2021-01-29 | 2021-01-29 | Device and method for measuring phase voltage of high-voltage cable terminal head |
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| CN202110128302.7A CN112924746A (en) | 2021-01-29 | 2021-01-29 | Device and method for measuring phase voltage of high-voltage cable terminal head |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114883032A (en) * | 2022-04-29 | 2022-08-09 | 翔耀电子(深圳)有限公司 | Cable module |
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2021
- 2021-01-29 CN CN202110128302.7A patent/CN112924746A/en active Pending
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| JPH01189571A (en) * | 1988-01-22 | 1989-07-28 | Showa Electric Wire & Cable Co Ltd | Testing apparatus of cable |
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Non-Patent Citations (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114883032A (en) * | 2022-04-29 | 2022-08-09 | 翔耀电子(深圳)有限公司 | Cable module |
| CN114883032B (en) * | 2022-04-29 | 2024-04-12 | 翔耀电子(深圳)有限公司 | Cable module |
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