CN112034239A - Integrated high-voltage line current monitoring and temperature monitoring device - Google Patents
Integrated high-voltage line current monitoring and temperature monitoring device Download PDFInfo
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- CN112034239A CN112034239A CN202010997575.0A CN202010997575A CN112034239A CN 112034239 A CN112034239 A CN 112034239A CN 202010997575 A CN202010997575 A CN 202010997575A CN 112034239 A CN112034239 A CN 112034239A
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- circuit
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- detection
- isolation
- detection equipment
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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
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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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
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Dc-Dc Converters (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses an integrated high-voltage line current detection and temperature detection device, which comprises a CT circuit, a power taking circuit and a conversion circuit, and is characterized in that a sampling feedback circuit is connected with an output end and then is connected with a PWM control circuit through isolation photoelectric coupling, the output end of the control circuit adjusts the pulse width (duty ratio) of an isolation transformer so as to adjust output voltage, meanwhile, a detection coil also provides an AC signal for the isolation transformer, comparison and amplification are carried out, an AC signal is provided for detection equipment, and a temperature probe also provides variable impedance for the detection equipment. The invention has the beneficial effects that: the high-voltage line does not need to be supplied with power independently in the detection equipment, the difficult problems of power supply and detection are solved together, and the invention applies the switching characteristics of the MOS tube, the isolation action of the transformer and the optical coupler, the effective control of the control chip, the reference voltage provided by the voltage stabilizing chip and other measures, so that the invention is safe, efficient, stable in performance, not easy to damage, interference-eliminating and generally applicable to the detection equipment.
Description
Technical Field
The invention relates to a detection device, in particular to an integrated high-voltage line current monitoring and temperature monitoring device.
Background
The current power supply method of the high-voltage intelligent electrical appliance comprises the following steps: the power supply system comprises a transformer direct power supply, an electromagnetic voltage transformer (PT) power supply, a CT power supply, a solar power generation power supply, a laser power supply and a capacitor series connection voltage division power supply, but the power supply system has many defects.
The high-voltage transformer and the electromagnetic voltage transformer mainly have the functions of realizing voltage transformation, have large volume and high cost, so that the application range is limited, and are particularly not suitable for being used as a primary conversion power supply of an electronic voltage transformer or a power supply of a power transmission line state detection system and the like; the solar power supply needs sunlight for solar power generation, so that the output electric energy is limited by the environment; the laser power supply has high cost, low efficiency and limited service life of optical elements, and the power supply method is limited by places and is not suitable for outdoor; the current transformer induction power taking device is small in size, light in weight and relatively ideal in power supply mode, is strongly influenced by current fluctuation, can ensure normal work of a load only by depending on the cooperation of an energy storage device when a circuit is in an idle load or a low current state close to the idle load, and needs to design a protection circuit load overvoltage when the current is large. Other detection equipment all need supply power for it alone, and is more loaded down with trivial details, if select this kind of integral type high tension line current monitoring and temperature monitoring device, small, light in weight are the ideal selection.
Disclosure of Invention
The invention aims to realize the integration of electricity taking and detection, and common detection equipment needs to be independently powered, so that the problem is well solved.
The invention adopts the following technical scheme that: the CT circuit comprises a power taking coil, a measuring coil and a temperature measuring probe; the power-taking circuit comprises a surge suppression circuit, a rectification energy storage circuit, an isolation transformer, a rectification filter circuit, an output circuit, a sampling feedback circuit, a photoelectric isolation circuit and a PWM control circuit, the electricity taking coil is connected with the input end of the electricity taking circuit, after voltage reduction is carried out by the surge suppression circuit, the rectification energy storage circuit and the isolation transformer, then the voltage is transmitted to an output circuit through a rectifying and filtering circuit to provide stable direct current voltage for the RS1000 current converter, and also charges the spare battery, the sampling feedback circuit is connected with the output end and then is connected with the PWM control circuit through isolation photoelectric coupling, the output end of the PWM control circuit adjusts the pulse width of the isolation transformer, the measuring coil provides an alternating current signal for the RS1000 current converter, the alternating current signal is compared and amplified and provided for the detection equipment, and the temperature measuring probe provides variable impedance for the detection equipment. The method comprises the following steps: CT, get electric circuit, converting circuit, get electric circuit again including surge suppression circuit, rectification energy storage, isolation transformer, rectification filtering, output circuit, sampling feedback, photoelectric isolation, PWM control. The electricity taking coil is connected with the input end of the electricity taking circuit, and supplies stable direct-current voltage to the RS1000 current converter through the surge suppression circuit, the rectification energy storage, the voltage reduction of the isolation transformer and the rectification filtering again, and meanwhile, the standby battery can be charged. The sampling feedback circuit is connected with the output end and then is connected with the PWM control circuit through isolation photoelectric coupling, the output end of the control circuit adjusts the pulse width (duty ratio) of the isolation transformer to adjust the output voltage, meanwhile, the detection coil also provides an AC signal for the isolation transformer, comparison and amplification are carried out, an AC signal is provided for the detection equipment, and the temperature probe also provides variable impedance for the detection equipment.
The invention has the beneficial effects that: the high-voltage line does not need to be supplied with power independently in the detection equipment, the difficult problems of power supply and detection are solved together, and the invention applies the switching characteristics of the MOS tube, the isolation action of the transformer and the optical coupler, the effective control of the control chip, the reference voltage provided by the voltage stabilizing chip and other measures, so that the invention is safe, efficient, stable in performance, not easy to damage, interference-eliminating and generally applicable to the detection equipment.
The detection equipment has the advantages that the current detection and temperature detection device of the integrated high-voltage line does not need to be additionally supplied with power.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a circuit of the surge suppression circuit, the rectification energy storage and the conversion part of the invention;
FIG. 3 is a circuit diagram of the PWM control of the present invention;
fig. 4 is a circuit diagram of the output of the isolation transformer of the present invention.
Detailed Description
Fig. 1 is a block diagram of the present invention. As shown in fig. 1, the integrated high voltage line current detection and temperature detection apparatus includes: the CT circuit comprises a power taking coil, a measuring coil and a temperature measuring probe; the power-taking circuit comprises a surge suppression circuit, a rectification energy storage circuit, an isolation transformer, a rectification filter circuit, an output circuit, a sampling feedback circuit, a photoelectric isolation circuit and a PWM control circuit, the electricity taking coil is connected with the input end of the electricity taking circuit, after voltage reduction is carried out by the surge suppression circuit, the rectification energy storage circuit and the isolation transformer, then the voltage is transmitted to an output circuit through a rectifying and filtering circuit to provide stable direct current voltage for the RS1000 current converter, and also charges the spare battery, the sampling feedback circuit is connected with the output end and then is connected with the PWM control circuit through isolation photoelectric coupling, the output end of the PWM control circuit adjusts the pulse width of the isolation transformer, the measuring coil provides an alternating current signal for the RS1000 current converter, the alternating current signal is compared and amplified and provided for the detection equipment, and the temperature measuring probe provides variable impedance for the detection equipment.
Fig. 2 shows a surge suppressing circuit, a rectifying energy storage and conversion part circuit of the invention. As shown in fig. 2, after being rectified by BR1, the smoothed dc voltage obtained by C1 filtering is sent to primary L1-3 of isolation transformer T1.
Fig. 3 is a circuit diagram of the PWM control circuit of the present invention. As shown in fig. 3, the control circuit includes a control chip U1(UC2845A), a MOS transistor Q1 and a peripheral circuit thereof, the peripheral circuit includes resistors R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, capacitors C3, C4, C5, C6, C7, C8, C9, C10, C11, diodes D1, D2, D3, D4, D5, a primary winding of an isolation transformer T1 has two coils L1-3 and L4-5, which are connected in series through a source and a drain of Q1, a head end of the coil L1-3 is connected to a source of the Q1, and a tail end of the coil L4-5 is connected to a drain 1 of the Q1 through R13; the other end of R13 is connected with the P5GND end of U1, the (P7) VI end of U1 is connected with R11 and supplies power for the chip initially, R11 is connected with the direct current output end of the rectifying circuit and the joint of the primary winding of the isolation transformer T1, the joint is also connected with one ends of R15 and C8, the other ends of R15 and C8 are connected with the cathode of a diode D2, and the anode of D2 is connected with the source of Q1; the (P2) VFB terminal of U1 is connected to one end of R8, the other end of R8 is connected to the output P3 of the isolation optocoupler U2 to control the pulse width (duty ratio) of the output, the (P3) OUT terminal of U3 is connected to R3, the other end of R3 is connected to the gate of Q3, the (P3) GND terminal of U3 is further connected to one ends of capacitors C3 and C3, the other end of C3 is connected to one ends of C3 and R3 (P3) CT/RT terminal of U3, C3 is used for determining the operating frequency of U3, the (P3) CT/RT terminal of U3 is connected to one ends of R3 and C3, the other ends of C3, C3 and R3 are connected to the (P3) ISEN terminal of U3, the other end of R3 is connected to the drain of Q3, the P3 of the optical-electrical isolation U3 is connected to the other end of R3, the P3 is connected to the P3, the P3 (P3) P3, the P3 is connected to the P3 of the P36. After normal operation, L4-5 is rectified by diodes D5 and D3, and filtered by capacitors C11 and C10 to continuously supply power to U1.
Fig. 4 is a circuit diagram of the output of the isolation transformer of the present invention. As shown in FIG. 4, the secondary side of the isolation transformer T1 has two coils L9-10 and L6-7, the coil L9-10 is rectified by D6, and filtered by C12, L7 and C13, so as to provide stable direct current voltage for the RS1000 current converter and charge a backup battery. The coil L6-7 is rectified by R20 and D7, C14 filters the current and supplies power to U3, P1 and P7 of an operational amplifier U4 pass through R34 to the B pole of Q3, the power is switched on and off, the grid of an MOS transistor Q2 is controlled, so that the output is controlled, P2 and P6 of U4 detect the voltage of an RS1000 current converter, P1 and P7 of U3 output low levels, an optical coupler U2 works, P3 of U2 is connected with P2 of U1 to control the output voltage of VFB, the voltage of U1-P2 drops to be more than the voltage of U1-P6 drops (pulse width is narrowed, duty ratio is reduced), the output voltage is restrained from increasing, so that the output voltage is stabilized, and the wider the control pulse width is the higher.
By adopting the embodiment, the high-voltage line does not need to be supplied with power independently in the detection equipment, the power supply and detection problems are solved together, the measures of the switching characteristic of the MOS tube, the isolation action of the transformer and the optical coupler, the effective control of the control chip, the reference voltage provided by the voltage stabilizing chip and the like are applied, the detection method is safe, efficient, stable in performance, not easy to damage, interference elimination and capable of being widely applied to the detection equipment.
Claims (2)
1. Integral type high-tension line current detection and temperature-detecting device, its characterized in that includes: the CT circuit comprises a power taking coil, a measuring coil and a temperature measuring probe; the power-taking circuit comprises a surge suppression circuit, a rectification energy storage circuit, an isolation transformer, a rectification filter circuit, an output circuit, a sampling feedback circuit, a photoelectric isolation circuit and a PWM control circuit, the electricity taking coil is connected with the input end of the electricity taking circuit, after voltage reduction is carried out by the surge suppression circuit, the rectification energy storage circuit and the isolation transformer, then the voltage is transmitted to an output circuit through a rectifying and filtering circuit to provide stable direct current voltage for the RS1000 current converter, and also charges the spare battery, the sampling feedback circuit is connected with the output end and then is connected with the PWM control circuit through isolation photoelectric coupling, the output end of the PWM control circuit adjusts the pulse width of the isolation transformer, the measuring coil provides an alternating current signal for the RS1000 current converter, the alternating current signal is compared and amplified and provided for the detection equipment, and the temperature measuring probe provides variable impedance for the detection equipment.
2. The integrated high-voltage line current detection and temperature detection device according to claim 1, wherein the PWM control circuit comprises a control chip and a MOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010997575.0A CN112034239A (en) | 2020-09-21 | 2020-09-21 | Integrated high-voltage line current monitoring and temperature monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010997575.0A CN112034239A (en) | 2020-09-21 | 2020-09-21 | Integrated high-voltage line current monitoring and temperature monitoring device |
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| Publication Number | Publication Date |
|---|---|
| CN112034239A true CN112034239A (en) | 2020-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010997575.0A Pending CN112034239A (en) | 2020-09-21 | 2020-09-21 | Integrated high-voltage line current monitoring and temperature monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552863A (en) * | 2021-08-11 | 2021-10-26 | 广西电网有限责任公司电力科学研究院 | Additional temperature rise calibrating device and method for transformer winding temperature controller |
-
2020
- 2020-09-21 CN CN202010997575.0A patent/CN112034239A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552863A (en) * | 2021-08-11 | 2021-10-26 | 广西电网有限责任公司电力科学研究院 | Additional temperature rise calibrating device and method for transformer winding temperature controller |
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