CN210775664U - Metering device for line loss - Google Patents
Metering device for line loss Download PDFInfo
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- CN210775664U CN210775664U CN201921428731.0U CN201921428731U CN210775664U CN 210775664 U CN210775664 U CN 210775664U CN 201921428731 U CN201921428731 U CN 201921428731U CN 210775664 U CN210775664 U CN 210775664U
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- current sensor
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- 230000005291 magnetic Effects 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 20
- 239000004020 conductor Substances 0.000 claims description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 12
- 229910052802 copper Inorganic materials 0.000 claims description 12
- 239000010949 copper Substances 0.000 claims description 12
- 239000003822 epoxy resin Substances 0.000 claims description 12
- 229920000647 polyepoxide Polymers 0.000 claims description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 239000004593 Epoxy Substances 0.000 abstract description 18
- 125000003700 epoxy group Chemical group 0.000 abstract description 18
- 238000005260 corrosion Methods 0.000 abstract description 8
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 241000272165 Charadriidae Species 0.000 description 7
- 238000010276 construction Methods 0.000 description 5
- 230000005350 ferromagnetic resonance Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 206010000369 Accident Diseases 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006011 modification reaction Methods 0.000 description 2
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- 230000015556 catabolic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The utility model discloses a metering device for line loss, including epoxy structure shell and epoxy structure body, the inside pouring of epoxy structure body has rochell coil current sensor, high pressure can be got electric capacity and resistance-capacitance partial pressure voltage sensor, the pouring has 4 screws on the epoxy structure shell, 4 screws are as an organic whole with corrosion resistant plate and this body coupling of epoxy structure, rochell coil current sensor gathers the alternating magnetic field that heavy current on the overhead line produced, voltage value on the overhead line is gathered to resistance-capacitance partial pressure voltage sensor, rochell coil current sensor's output and resistance-capacitance partial pressure voltage sensor's output all are connected to external ammeter, the power input of the integrator of rochell coil current sensor and the power input of external ammeter are connected to the output that high pressure was got electric capacity. The utility model discloses a precision is high, small and can real-time supervision voltage, but wide application in circuit monitoring technical field.
Description
Technical Field
The utility model belongs to the technical field of the circuit monitoring technique and specifically relates to a metering device for circuit loss.
Background
The existing equipment for measuring the current and voltage of the line and calculating the line loss of the 10kV overhead line is a traditional electromagnetic transformer, and the basic structure of the traditional electromagnetic transformer is an iron core, a primary winding and a secondary winding. The voltage transformer is used for measuring voltage, secondary impedance is very small, and once a secondary side is short-circuited, current rapidly increases to burn a coil, so that a fire accident is caused. The current transformer is used for measuring current, the secondary side is not allowed to be opened during operation, and once the current is opened, the primary side current becomes excitation current, so that the magnetic flux and the voltage of the secondary side greatly exceed normal values, and the safety of human bodies and equipment is endangered. The voltage transformer and the current transformer are combined into a whole, and the transformer is a combined transformer, so that the function of measuring current and voltage can be realized. In addition, due to the existence of the iron core structure, ferromagnetic resonance overvoltage can not be avoided, and when overvoltage is generated, the excitation current of a winding of the transformer is greatly increased due to the saturation of the iron core of the transformer, so that the operation safety of equipment and a power grid is influenced. The traditional electromagnetic mutual inductor has the defects of large volume and heavy weight, and must be installed on a metal support, and the metal support is fixed on an electric pole, so that the construction is complicated, and the workload of later maintenance is large.
The voltage transformer is used for measuring voltage, secondary impedance is small, once a secondary side is short-circuited, current rapidly increases to burn a coil, and fire accidents are caused. The current transformer is used for measuring current, the secondary side is not allowed to be opened during operation, once the current is opened, the primary side current becomes exciting current, and the magnetic flux and the voltage of the secondary side greatly exceed normal values, so that the safety of human bodies and equipment is endangered. In addition, due to the existence of the iron core structure, ferromagnetic resonance overvoltage can not be avoided, and when overvoltage is generated, the excitation current of a winding of the transformer is greatly increased due to the saturation of the iron core of the transformer, so that the operation safety of equipment and a power grid is influenced. The traditional electromagnetic mutual inductor has the defects of large volume and heavy weight, and must be installed on a metal support, and the metal support is fixed on an electric pole, so that the construction is complicated, and the workload of later maintenance is large.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a metering device for line loss, which has high precision, small size and can monitor voltage in real time.
The embodiment of the utility model provides a metering device for line loss, including epoxy structure shell and epoxy structure body, the inside pouring of epoxy structure body has roche coil current sensor, high pressure to get can electric capacity and resistance-capacitance partial pressure voltage sensor, the pouring has 4 screws on the epoxy structure shell, 4 screws are as an organic whole with corrosion resistant plate and this body coupling of epoxy structure, and built on stilts bare conductor passes the hole between corrosion resistant plate and the body, the alternating magnetic field that the heavy current on the overhead line produced is gathered to roche coil current sensor, resistance-capacitance partial pressure voltage sensor gathers the voltage value on the overhead line, the output of roche coil current sensor's integrator and resistance-capacitance partial pressure voltage sensor's output all are connected to external ammeter, the power input end of the integrator of the output connection roche coil current sensor of high pressure energy-taking electric capacity and the power input of external ammeter And (4) an end.
Further, be equipped with the copper inserts on the epoxy structure body, the copper inserts compresses tightly corrosion resistant plate and body through the bolt, corrosion resistant plate and overhead bare conductor contact, the copper inserts is connected to resistance-capacitance partial pressure voltage sensor's high-pressure end at the pouring structure internal connection of epoxy structure body.
Further, the output end of the integrator of the rogowski coil current sensor and the output end of the resistance-capacitance voltage division sensor are connected to an external ammeter through a secondary twisted pair shielding cable.
Furthermore, the resistance-capacitance voltage division sensor is composed of a high-voltage resistor, a high-voltage capacitor, a low-voltage resistor, a low-voltage capacitor and a gas discharge tube.
Further, the rogowski coil current sensor is composed of a rogowski coil and an integrator.
Above-mentioned the utility model discloses technical scheme in the embodiment has following advantage: the embodiment of the utility model has no iron core structure, avoids the generation of ferromagnetic resonance overvoltage, has good linearity, is not easy to saturate, and improves the accuracy; in addition, the device of the utility model has small volume and light weight, and is convenient for subsequent maintenance; the utility model discloses a resistance-capacitance partial pressure voltage sensor, high voltage on can the real-time supervision circuit, the security is high, and voltage detection adopts resistance-capacitance partial pressure principle, no iron core structure, and insulation structure is simple, and is small, light in weight, no saturation phenomenon, and the linearity is good, and the accuracy is high.
Drawings
Fig. 1 is a schematic diagram of an overall structure of a metering device for line loss according to the present invention;
FIG. 2 is a schematic diagram of a resistance-capacitance voltage-dividing sensor of the present invention;
fig. 3 is a schematic diagram of the rogowski coil current sensor of the present invention.
Detailed Description
Referring to fig. 1, the embodiment of the utility model provides a metering device for line loss, including epoxy structure shell and epoxy structure body, the inside pouring of epoxy structure body has roche coil current sensor, high pressure to get can electric capacity and resistance-capacitance partial pressure voltage sensor, the pouring has 4 screws on the epoxy structure shell, 4 screws are as an organic whole with corrosion resistant plate and this body coupling of epoxy structure, and built on stilts bare conductor passes the hole between corrosion resistant plate and the body, the alternating magnetic field that the heavy current produced on the overhead line is gathered to roche coil current sensor, resistance-capacitance partial pressure voltage sensor gathers the voltage value on the overhead line, the output of roche coil current sensor's integrator and resistance-capacitance partial pressure voltage sensor's output all are connected to external ammeter, the power input end and the external ammeter of the integrator of roche coil current sensor are connected to high pressure power of getting can electric capacity's output To the power supply input terminal.
Specifically, as figure 1, the utility model discloses a complete sets, overall structure designs for upper and lower two parts, and first half is opened on the corrosion resistant plate has four screws 1, adopts four screws of bolted connection main structure upper surface, and built on stilts bare conductor passes from the hole in the middle, makes things convenient for the construction installation that passes built on stilts bare conductor on the overhead line. The epoxy resin poured shell has good electrical insulation performance, the Rogowski coil current sensor 3, the high-voltage energy-taking capacitor 4 and the resistance-capacitance voltage-dividing sensor 5 are poured in the epoxy resin structure. The Rogowski coil current sensor is used for inducing an alternating magnetic field generated by large current on an overhead line, integrating induced voltage signals through an integrator arranged in the Rogowski coil current sensor, converting the integrated voltage signals into current signals, and transmitting the current signals to a high-precision electric meter through a secondary shielding cable. The overhead bare conductor is in direct contact with the copper insert 2, and the resistance-capacitance voltage division sensor converts the acquired overhead line high voltage value into a small voltage value and transmits the small voltage value to the high-precision electric meter through the secondary shielding cable. The high-voltage energy-taking capacitor 4 is used for providing a working power supply for an integrator of the Rogowski coil and an external high-precision electric meter, 6 is a secondary twisted-pair shielding cable, and 7 is an outer box provided with the external high-precision electric meter. The utility model discloses an overall structure adopts bolted connection installation for upper and lower two parts, has the advantage of making things convenient for overhead line to install, can be non-maintaining for a long time.
Referring to fig. 1, as a further preferred embodiment, a copper insert is arranged on the epoxy resin structural body, the copper insert compresses a stainless steel plate and the body through a bolt, the stainless steel plate is in contact with the overhead bare conductor, and the copper insert is connected to a high-voltage end of the resistance-capacitance partial voltage sensor inside a casting structure of the epoxy resin structural body.
Referring to fig. 1, further as a preferred embodiment, the output terminal of the integrator of the rogowski coil current sensor and the output terminal of the resistance-capacitance divided voltage sensor are connected to an external electric meter through a secondary twisted pair shielded cable.
Referring to fig. 2, further as a preferred embodiment, the resistance-capacitance voltage division sensor is composed of a high-voltage resistor, a high-voltage capacitor, a low-voltage resistor, a low-voltage capacitor and a gas discharge tube.
Specifically, in fig. 2, R1 represents a high voltage divider resistor, which carries a high voltage value on the line; RT represents a gas discharge tube and is used for protecting secondary low-voltage equipment from ground short circuit during high-voltage breakdown; r2 represents a low-voltage divider resistor, according to the resistor voltage division relationship, the ratio of the low-voltage divider resistor value to the high-voltage divider resistor value is equal to the ratio of the low-voltage output voltage value to the high-voltage value, the low-voltage output voltage value is a secondary output voltage value, and the high-voltage value is an overhead line voltage value; c1 represents a high-voltage-dividing capacitor connected in parallel with the high-voltage resistor, C2 represents a low-voltage-dividing capacitor connected in parallel with the low-voltage resistor, and the high-voltage-dividing capacitor and the low-voltage-dividing capacitor enable the output angle deviation to be within a qualified range by changing the capacitive reactance of the high voltage and the low voltage.
Fig. 2 shows the principle of a resistor-capacitor voltage division sensor. Copper insert 2 and built on stilts bare conductor direct contact to in the inside lug connection of epoxy integral casting structure in the high-pressure end of resistance-capacitance partial voltage sensor 5, the high voltage value on the overhead line that resistance-capacitance partial voltage sensor will gather passes through the partial pressure proportion and converts little voltage value into, carries the high accuracy ammeter in, is gathered the little voltage value of test by the high accuracy ammeter and is done further processing.
Further as a preferred embodiment, the rogowski coil current sensor is composed of a rogowski coil and an integrator.
Specifically, in fig. 3, R21 represents a first input resistance; r22 represents a second input resistance; r23 represents a third input resistance; c21 represents a filter capacitor; OUT represents an operational amplifier, and the small signal sensed by the Rogowski coil is amplified and integrated by a circuit, so that the sensed signal can be amplified and restored.
As shown in fig. 3, the rogowski coil current sensor includes a coil and an integrator, the coil does not include a core, is a flexible coil, has certain plasticity, and is uniformly wound on a non-ferromagnetic material, and is a current sensing portion. The integrator can restore the measured alternating current by amplifying and integrating the voltage inductively output by the Rogowski coil. The resistance-capacitance voltage division sensor has the characteristics of small volume, light weight, high precision, high reliability and the like, can effectively eliminate the influence of stray resistance and proximity effect on the precision of a 10kV line after the structure is optimally designed, and has the precision reaching 0.2S level and good linearity.
In addition, the high-voltage energy-taking capacitor of the embodiment mainly comprises a capacitive voltage divider and a medium-voltage transformer, and the high-voltage energy-taking capacitor collects high voltage and then transforms the voltage through the transformer to provide alternating-current 220V voltage to be used as a power supply of the rogowski coil integrator and the high-precision electric meter.
The working principle of the device of the present invention is described in detail below:
the built on stilts bare conductor passes the utility model discloses the round hole after the upper and lower two parts of device are connected compresses tightly through 4 bolts and fixes on built on stilts bare conductor with upper and lower two parts. The bare conductor is in contact with the copper insert, high voltage is applied to the high-voltage input end of the resistance-capacitance voltage division sensor, and the high voltage is converted into a small voltage value through the resistance-capacitance voltage division principle and is transmitted to the high-precision electric meter through the twisted-pair shielding cable. The high-voltage energy-taking capacitor outputs alternating current 220V voltage after the acquired high voltage is transformed by the transformer to be used as a working power supply of the Rogowski coil integrator and the electric meter. The Rogowski coil current sensor is used for inducing an alternating magnetic field generated by large current on an overhead line, integrating induced voltage signals through an integrator arranged in the Rogowski coil current sensor, converting the integrated voltage signals into current signals, and transmitting the current signals to a high-precision electric meter through a secondary shielding cable. The high-precision electric meter performs power operation on the obtained voltage and current signals and performs simple calculation on the power value measured by the adjacent device to obtain the loss value of the overhead line.
To sum up, the utility model discloses a metering device for circuit loss has following advantage:
the utility model uses the Rogowski coil current sensor to measure the current of the medium-voltage line; the idea of providing power for the Rogowski coil integrator and the external high-precision ammeter by using the energy-taking capacitor; the design idea of measuring the current and the voltage on the line by combining the Rogowski coil and the resistance-capacitance voltage division principle is adopted; the integral structure design of the upper part and the lower part is convenient for construction and installation on a line.
The utility model discloses a principle adopt the rogowski coil principle for current monitoring, rogowski coil generally is used for the monitoring to electric current on the level high-voltage line more than 110kV, it is high to have the precision, the linearity is good, be difficult to the advantage of saturation, on transplanting the rogowski coil commonly used on the high-voltage line 10kV well voltage circuit, to the complete sets of this kind of 10kV line loss measurement of high accuracy measurement demand development of current-voltage on the 10kV overhead line, not only the precision is higher, satisfy the requirement of line loss measurement management to 0.2S level, and small, light in weight, no iron core structure, ferromagnetic resonance overvoltage' S production has been avoided. The voltage detection adopts a resistance-capacitance voltage division principle, has no iron core structure, simple insulating structure, small volume, light weight, no saturation phenomenon, good linearity and high accuracy, and can reach 0.2S level. The integral structure is installed in an overhead mode, an installation support is not needed, and construction is simple and convenient.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (5)
1. A metering device for line losses, characterized by: comprises an epoxy resin structure shell and an epoxy resin structure body, wherein a Rogowski coil current sensor, a high-voltage energy-taking capacitor and a resistance-capacitance voltage-dividing sensor are cast in the epoxy resin structure body, 4 screw holes are poured on the epoxy resin structure shell, the stainless steel plate and the epoxy resin structure body are connected into a whole by the 4 screw holes, the overhead bare conductor passes through a hole between the stainless steel plate and the body, the Rogowski coil current sensor collects an alternating magnetic field generated by large current on the overhead line, the resistance-capacitance voltage division sensor collects a voltage value on the overhead line, the output end of the integrator of the Rogowski coil current sensor and the output end of the resistance-capacitance voltage division sensor are both connected to an external ammeter, the output end of the high-voltage energy-taking capacitor is connected with the power input end of the integrator of the Rogowski coil current sensor and the power input end of the external ammeter.
2. A meter for line losses according to claim 1, characterized in that: the epoxy resin structure body is provided with a copper insert, the copper insert compresses a stainless steel plate and the epoxy resin structure body through a bolt, the stainless steel plate is in contact with an overhead bare conductor, and the copper insert is connected to a high-voltage end of a resistance-capacitance voltage division voltage sensor in a pouring structure of the epoxy resin structure body.
3. A meter for line losses according to claim 1, characterized in that: the output end of the integrator of the Rogowski coil current sensor and the output end of the resistance-capacitance voltage division sensor are connected to an external ammeter through a secondary twisted pair shielding cable.
4. A meter for line losses according to claim 1, characterized in that: the resistance-capacitance voltage division sensor is composed of a high-voltage resistor, a high-voltage capacitor, a low-voltage resistor, a low-voltage capacitor and a gas discharge tube.
5. A meter for line losses according to claim 1, characterized in that: the Rogowski coil current sensor consists of a Rogowski coil and an integrator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921428731.0U CN210775664U (en) | 2019-08-29 | 2019-08-29 | Metering device for line loss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921428731.0U CN210775664U (en) | 2019-08-29 | 2019-08-29 | Metering device for line loss |
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| Publication Number | Publication Date |
|---|---|
| CN210775664U true CN210775664U (en) | 2020-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921428731.0U Active CN210775664U (en) | 2019-08-29 | 2019-08-29 | Metering device for line loss |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858765A (en) * | 2020-12-29 | 2021-05-28 | 广东电网有限责任公司电力科学研究院 | Capacitor bank busbar current measuring circuit based on Rogowski coil |
-
2019
- 2019-08-29 CN CN201921428731.0U patent/CN210775664U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858765A (en) * | 2020-12-29 | 2021-05-28 | 广东电网有限责任公司电力科学研究院 | Capacitor bank busbar current measuring circuit based on Rogowski coil |
| CN112858765B (en) * | 2020-12-29 | 2022-07-19 | 广东电网有限责任公司电力科学研究院 | Capacitor bank busbar current measuring circuit based on Rogowski coil |
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