CN218162231U - Electricity taking and voltage and current sampling device - Google Patents
Electricity taking and voltage and current sampling device Download PDFInfo
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- CN218162231U CN218162231U CN202222292529.8U CN202222292529U CN218162231U CN 218162231 U CN218162231 U CN 218162231U CN 202222292529 U CN202222292529 U CN 202222292529U CN 218162231 U CN218162231 U CN 218162231U
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Abstract
The utility model discloses a get electricity and voltage and current sampling device, including electric capacity sampling subassembly, rogowski coil, CPU, electric capacity sampling subassembly and Rogowski coil are installed on same generating line, electric capacity sampling subassembly includes high-voltage capacitor, insurance resistance and piezo-resistor, the one end lug connection 10kV circuit of high-voltage capacitor, insurance resistance and CPU are connected to the other end, the one end of piezo-resistor is connected to the other end of insurance resistance, the other end ground connection CPU is connected to piezo-resistor; two ends of the Rogowski coil are connected with the CPU; two ends of the CPU connected with the capacitance sampling assembly are used as a power supply and voltage sampling input of the CPU; two ends of the CPU connected with the Rogowski coil are used as current sampling input. The utility model discloses utilize and get the electric installation principle and get the electricity, can also carry out voltage sampling simultaneously to adopt the luo shi coil to carry out the current sampling, thereby carry out the electric quantity and calculate and protect complete device.
Description
Technical Field
The utility model relates to a circuit sampling device field specifically is a get electric and voltage current sampling device.
Background
In a 10kV three-phase ungrounded system, a power supply and a voltage sampling of a traditional controller device need to use an electromagnetic voltage transformer and an electromagnetic current transformer for current collection. The electromagnetic voltage transformer is large in size and high in price, and burnout accidents can be caused by electromagnetic resonance of a system and secondary side load short circuit. The electromagnetic current transformer is also large in size and is forbidden to be opened secondarily. At present, electricity taking devices exist on the market, but the electricity taking devices do not have a voltage sampling function, so that if a traditional electromagnetic voltage transformer is replaced, an electronic voltage transformer needs to be installed, the principle of the electronic voltage transformer needs to be three-phase, the electronic voltage transformer needs to be installed on a 10kV three-phase line, wiring is relatively complex, and the total cost exceeds that of the electromagnetic transformer. The Rogowski coil can be opened for the second time without accidents because the output wire is weak, so that the Rogowski coil can replace a conventional electromagnetic current transformer to carry out current sampling, and is also produced by manufacturers in the market. However, no device which can take electricity by utilizing the principle of an electricity taking device, can sample voltage and support the Rogowski coil current sampling so as to calculate electric quantity and protect the whole device exists at present.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an get electric and voltage current sampling device to solve the problem that proposes in the above-mentioned background art.
In order to solve the technical problem, the utility model provides a following technical scheme: a power-taking and voltage-current sampling device comprises a capacitance sampling assembly, a Rogowski coil and a CPU, wherein the capacitance sampling assembly and the Rogowski coil are arranged on the same bus,
the capacitance sampling assembly comprises a high-voltage capacitor, a safety resistor and a piezoresistor, one end of the high-voltage capacitor is directly connected with the 10kV circuit, the other end of the high-voltage capacitor is connected with the safety resistor and the CPU, the other end of the safety resistor is connected with one end of the piezoresistor, and the other end of the piezoresistor is grounded and connected with the CPU;
two ends of the Rogowski coil are connected with the CPU;
two ends of the CPU connected with the capacitance sampling assembly are used as a power supply and voltage sampling input of the CPU;
and two ends of the CPU connected with the Rogowski coil are used as current sampling input.
Preferably, the CPU is provided with a voltage rectifying part B1 and a power supply voltage processing component B2, which together perform the function of a switching power supply to convert the input wide-range voltage signal into a stable dc voltage required by the CPU.
Preferably, the voltage sampling part of the CPU voltage and current sampling part comprises a current limiting resistor A1 not less than 1M omega, an isolation voltage transformer A2, voltage division sampling resistors A3 and A4, two protection diodes D1 and D2 which are connected in parallel in a positive and negative way, and a filter capacitor C1;
the current sampling part comprises 1 sampling resistor A6, two diodes D3 and D4 which are connected in parallel in a positive and negative way, and a filter capacitor C2.
Preferably, voltage sampling points of the voltage sampling part are positioned at U1 and U2 of the voltage rectifying part B1, any end of a sampling connecting line is connected in series with a current limiting resistor A1 which is not less than 1M omega and then connected to an isolation voltage transformer A2, the isolation voltage transformer A2 outputs secondary voltage which is connected in series with voltage dividing resistors A3 and A4, two ends of one voltage dividing resistor A4 in the voltage dividing resistors are connected in parallel with two protection diodes D1 and D2, a filter capacitor C1 and a power operation component which are connected in parallel in a positive and negative way.
Preferably, the current sampling of the current sampling part directly passes through a sampling resistor A6, and two ends of one resistor are connected in parallel with two protection diodes D3 and D4 which are connected in parallel in a positive and negative way, a filter capacitor C2 and a power operation component.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses utilize and get the electric installation principle and get the electricity, can also carry out voltage sampling simultaneously to adopt the luo shi coil to carry out the electric current sampling, thereby carry out the electric quantity and calculate and protect complete device. The traditional electromagnetic type voltage transformer, the electromagnetic type current transformer and the voltage and current sampling device thereof are replaced, and the capacitor sampling assembly is not provided with a traditional iron core, so that ferromagnetic resonance of the electromagnetic type voltage transformer is avoided, and the secondary side can be short-circuited.
And the voltage sampling loop with the current-limiting resistor is designed, so that the current of the sampling circuit can be limited, the consumption of obtaining electric energy from the capacitance sampling assembly is reduced, and the method is particularly important for obtaining electric equipment with smaller capacity.
In addition, measures such as a safety resistor, a piezoresistor, a diode reversely connected in parallel and the like are adopted, so that the protection is complete.
Drawings
FIG. 1 is a circuit diagram of the present invention;
fig. 2 is the structure diagram of the CPU of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, the present embodiment provides a power-taking and voltage-current sampling apparatus, which includes a capacitor sampling assembly, a rogowski coil assembly and a CPU assembly.
The capacitance sampling assembly and the Rogowski coil assembly are acquisition devices arranged on the same bus of the circuit. As shown in the figure, is installed on the 10kV C phase.
The capacitance sampling assembly comprises a high-voltage capacitor 1, a safety resistor 2 and a piezoresistor 3, one end of the high-voltage capacitor 1 is directly connected with a 10kV circuit, the other end of the high-voltage capacitor is connected with the safety resistor 2 and a CPU assembly 5, the other end of the safety resistor 2 is connected with one end of the piezoresistor 3, and the other end of the piezoresistor 3 is grounded and connected with the CPU assembly 5;
two ends of the Rogowski coil 4 are connected with a CPU component 5;
two ends of the CPU component 5 connected with the capacitance sampling component are used as a power supply and voltage sampling input of the CPU component, such as U1 and U2 ends of figure 2, and two ends connected with the Rogowski coil 4 are used as current sampling input, such as I1 and I2 ends of figure 2. The CPU component is internally provided with a voltage rectification part B1, a power supply voltage processing component B2, a voltage and current sampling part as a loop where labeled elements A1-A6, D1-D4 and C1-C2 in figure 2 are positioned, and also comprises a power operation component as figure 2.
A voltage rectification part B1 is arranged in the CPU component, and a power supply voltage processing component B2 jointly completes the function of a switching power supply to convert an input wide-range voltage signal into stable direct-current voltage required by the CPU component. The switch power supply is a conventional device and the principle and the use thereof are not described in detail.
The voltage sampling part of the CPU component voltage and current sampling part comprises a current limiting resistor A1 not less than 1M omega, an isolation voltage transformer A2, voltage division sampling resistors A3 and A4, two protection diodes D1 and D2 which are in positive and negative connection and parallel connection, and a filter capacitor C1. The current sampling part comprises 1 sampling resistor A6, two diodes D3 and D4 which are connected in parallel in a positive and negative way, and a filter capacitor C2.
The voltage sampling point of the voltage sampling part is at U1 and U2 in the front figure of the voltage rectifying part B1, any end of the sampling connecting line is connected in series with a current limiting resistor A1 not less than 1M omega and then connected to an isolation voltage transformer A2, the isolation voltage transformer A2 outputs a secondary voltage and is connected with voltage dividing resistors A3 and A4 in series, and two ends of one of the voltage dividing resistors, such as the two ends of the A4 in the example, are connected in parallel with two protection diodes D1 and D2, a filter capacitor C1 and a power operation component in parallel in a positive and negative way.
The current sampling of the current sampling part directly passes through a sampling resistor A6, and two protection diodes D3 and D4, a filter capacitor C2 and a power operation component are connected in parallel in a positive and negative way at two ends of the resistor.
The power operation component is similar to the conventional controller and is not described in detail.
When the device works, a series circuit is formed by the high-voltage capacitor 1, the insurance resistor 2 and the voltage dependent resistor 3 in the capacitance sampling assembly according to the connection mode, and the voltage at two ends of the series part of the insurance resistor 2 and the voltage dependent resistor 3 is input to the CPU assembly. The voltage of the two ends of the voltage dependent resistor 3 is limited to be not more than the rated voltage, and the capacitor sampling assembly is protected from being burnt by fusing the safety resistor 2 when the resistance value is reduced and the overcurrent of the series circuit is caused when the voltage of the two ends of the voltage dependent resistor 3 is overhigh. The rogowski coil 4 is used as a current transformer to input a current signal to the CPU component. Because of the wide voltage input to the CPU assembly, the CPU assembly has built-in voltage rectifying part to complete the function of switching power supply, so as to complete the power taking function. The current limiting resistor A1 in the voltage sampling part limits the current of the sampling circuit when acting, and reduces the consumption of electric energy obtained from the capacitance sampling assembly. The isolation voltage transformer A2 is used for preventing external voltage from interfering with a power operation component in the CPU component, the two sampling resistors A3 and A4 are used for obtaining a voltage signal with a required magnitude on one resistor by adjusting the resistance ratio of the two resistors, wherein the voltage signal is smaller than 0.7V in the embodiment, and the two protection diodes D1 and D2 which are connected in parallel in a positive and negative way are used for limiting the voltage signal within 0.7V by utilizing the characteristic that the PN junction of the diode needs to be at least 0.7V when being conducted, so that a power operation device at the rear end is protected. The current sampling loop device functions as a voltage sampling.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides an get electric and voltage and current sampling device which characterized in that: the transformer substation capacitor sampling device comprises a capacitor sampling assembly, a Rogowski coil (4) and a CPU (5), wherein the capacitor sampling assembly and the Rogowski coil (4) are installed on the same bus, the capacitor sampling assembly comprises a high-voltage capacitor (1), a safety resistor (2) and a piezoresistor (3), one end of the high-voltage capacitor (1) is directly connected with a 10kV circuit, the other end of the high-voltage capacitor is connected with the safety resistor (2) and the CPU (5), the other end of the safety resistor (2) is connected with one end of the piezoresistor (3), and the other end of the piezoresistor (3) is grounded and connected with the CPU (5); two ends of the Rogowski coil (4) are connected with a CPU (5); the two ends of the CPU (5) connected with the capacitance sampling assembly are used as a power supply and voltage sampling input of the CPU; and two ends of the CPU (5) connected with the Rogowski coil (4) are used as current sampling input.
2. The power-taking and voltage-current sampling device according to claim 1, characterized in that: the CPU (5) is internally provided with a voltage rectification part B1 and a power supply voltage processing component B2 which jointly complete the function of a switching power supply to convert an input wide-range voltage signal into a stable direct-current voltage required by the CPU.
3. The power-taking and voltage-current sampling device according to claim 1, characterized in that: the voltage sampling part of the voltage and current sampling part of the CPU (5) comprises a current limiting resistor A1 not less than 1M omega, an isolation voltage transformer A2, voltage division sampling resistors A3 and A4, two protection diodes D1 and D2 which are connected in parallel in a positive and negative mode, and a filter capacitor C1; the current sampling part comprises 1 sampling resistor A6, two diodes D3 and D4 which are connected in parallel in a positive and negative way, and a filter capacitor C2.
4. The power-taking and voltage-current sampling device according to claim 3, wherein: the voltage sampling point of the voltage sampling part is at U1 and U2 of the voltage rectification part B1, any end of the sampling connection line is connected in series with a current-limiting resistor A1 which is not less than 1M omega and then connected to an isolation voltage transformer A2, the isolation voltage transformer A2 outputs a secondary voltage which is connected in series with divider resistors A3 and A4, and two ends of one divider resistor A4 in the divider resistors are connected in parallel with two diodes D1 and D2 for protection, a filter capacitor C1 and a power operation assembly in parallel in a positive and negative connection mode.
5. The power-taking and voltage-current sampling device according to claim 3, wherein: the current sampling of the current sampling part directly passes through a sampling resistor A6, and two protection diodes D3 and D4, a filter capacitor C2 and a power operation component are connected in parallel in a positive and negative way at two ends of the resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222292529.8U CN218162231U (en) | 2022-08-30 | 2022-08-30 | Electricity taking and voltage and current sampling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222292529.8U CN218162231U (en) | 2022-08-30 | 2022-08-30 | Electricity taking and voltage and current sampling device |
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| Publication Number | Publication Date |
|---|---|
| CN218162231U true CN218162231U (en) | 2022-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222292529.8U Active CN218162231U (en) | 2022-08-30 | 2022-08-30 | Electricity taking and voltage and current sampling device |
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| CN (1) | CN218162231U (en) |
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- 2022-08-30 CN CN202222292529.8U patent/CN218162231U/en active Active
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