CN213069004U

CN213069004U - Three-phase four-wire Rogowski coil large current guide rail meter

Info

Publication number: CN213069004U
Application number: CN202020819740.9U
Authority: CN
Inventors: 沈东伟; 周伟
Original assignee: Zhejiang Yongtailong Electronic Co ltd
Current assignee: Zhejiang Yongtailong Electronic Co ltd
Priority date: 2020-05-15
Filing date: 2020-05-15
Publication date: 2021-04-27
Anticipated expiration: 2030-05-15

Abstract

The utility model provides a three-phase four-wire luo shi coil heavy current guide rail table, including the ampere meter body, the ampere meter body includes device power, sampling module, metering module, processing module and display module, metering module includes the measurement chip, the ampere meter body is installed on the guide rail, just the device power is located in the guide rail, sampling module includes primary current sampling device, primary current sampling device includes three luo shi coil, the secondary output of luo shi coil all connect in the measurement chip is in order to export the differential signal of secondary output to the measurement chip, the measurement chip embeds there is integrating circuit. The utility model discloses a flexible luo shi coil carries out the current sampling, has advantages such as simple to operate is simple, and is applied to guide tracked ammeter with luo shi coil sampling on, has realized the perfect adaptation of little volume heavy current.

Description

Three-phase four-wire Rogowski coil large current guide rail meter

Technical Field

The utility model belongs to the technical field of the ampere meter, especially, relate to a three-phase four-wire luo shi coil heavy current guide rail table.

Background

The electric energy meter field generally has two forms of ammeter, and direct formula scheme generally measures the electric current and is below 200A, and in the field of measurement more than 200A, generally adopts the mode of external mutual inductance formula to carry out, but external mutual inductor need set up CT's proportion and select corresponding external CT type, and this is very convenient for many users.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the above-mentioned problem, a three-phase four-wire Rogowski coil heavy current guide rail table is provided.

In order to achieve the above purpose, the utility model adopts the following technical proposal:

the utility model provides a three-phase four-wire rogowski coil heavy current guide rail table, includes the ampere meter body, the ampere meter body includes device power, sampling module, metering module, processing module and display module, metering module includes the measurement chip, the ampere meter body is installed on the guide rail, just the device power is located in the guide rail, sampling module includes primary current sampling device, primary current sampling device includes three rogowski coil, the secondary output of rogowski coil all connect in the measurement chip is in order to export the differential signal of secondary output to the measurement chip, the measurement chip embeds there is integrating circuit.

In the three-phase four-wire rogowski coil large-current guide rail meter, the model of the metering chip is V9203.

In the above three-phase four-wire rogowski coil high current rail meter, the processing module comprises an SOC chip with an MO core.

In the three-phase four-wire rogowski coil large-current guide rail meter, the model of the SOC chip is HT 6015.

In the three-phase four-wire rogowski coil large-current guide rail meter, the metering chip is in communication connection with the SOC chip through an SPI communication bus.

In the above three-phase four-wire rogowski coil large current guide rail meter, the sampling module includes a voltage sampling circuit and a current sampling circuit, and the current sampling circuit includes the primary current sampling device.

In the above-mentioned three-phase four-wire rogowski coil large current guide rail meter, still include the reserve battery that can supply power for RTC, metering module and processing module all connect in reserve battery.

In the above three-phase four-wire rogowski coil high current rail meter, the device power supply comprises a high voltage type switching power supply having an isolated withstand voltage output of at least 4.5 KV.

In the three-phase four-wire Rogowski coil high-current guide rail meter, the processing module is connected with an infrared communication module and an RS485 bus.

In the above three-phase four-wire rogowski coil high-current rail meter, the current meter housing has a touch module connected to the processing module.

The utility model has the advantages that: the clock can be ensured to normally run for a long time when power is cut off; the ammeter shell is provided with the touch module, so that the ammeter shell has higher sealing performance and operation convenience; the flexible Rogowski coil is adopted for current sampling, so that the device has the advantages of convenience and simplicity in installation and the like; the Rogowski coil sampling is applied to the guide rail type electric meter, and the perfect combination of small volume and large current is realized.

Drawings

FIG. 1 is a block diagram of the circuit structure of the three-phase four-wire Rogowski coil heavy current rail meter

Fig. 2 is a voltage sampling circuit diagram of the three-phase four-wire rogowski coil large current guide rail meter of the utility model;

fig. 3 is the current sampling circuit diagram of the three-phase four-wire rogowski coil large current guide rail meter.

Reference numeral, a device power supply 1; a sampling module 2; a Rogowski coil 21; a metering module 3; a display module 4; an infrared communication module 5; an RS485 bus 6; a touch module 7; a processing module 8; a backup battery 9.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, the embodiment discloses a three-phase four-wire rogowski coil large-current guide rail meter, which comprises an ammeter body, wherein the ammeter body comprises a device power supply 1, a sampling module 2, a metering module 3, a processing module 8 and a display module 4, the metering module 3 comprises a metering chip, and the display module 4 adopts a-40-80 ° ultra-wide temperature range total reflection liquid crystal screen, so that reliable metering parameter display can be realized in the range required by IEC.

Further, the processing module 8 is also connected with an RS485 bus 6, which follows a Modbus communication protocol, so that the external device can achieve real-time acquisition of relevant parameters and parameter setting through a protocol command. In addition, the processing module 8 is also connected with an infrared communication module 5, and the infrared communication module 5 adopts IEC62056-21 protocol.

Furthermore, the ammeter shell is provided with a touch module 7 connected to the processing module 8, two touch control chips can be adopted, touch induction on the outer portion of the ammeter shell is achieved by detecting capacitance values of specific areas, corresponding pulse signals are output to the processing module 8, key operations such as page turning and long-time press switching are achieved, and the ammeter shell has higher sealing performance and operation convenience.

In addition, the device power supply 1 comprises a high-voltage type switching power supply with at least 4.5KV isolation withstand voltage output, and the isolation requirement of an RS485 communication bus is guaranteed.

Particularly, the ammeter body of this embodiment is installed on the guide rail, adopts guide rail formula ammeter form promptly, and guide rail formula ammeter has small, installs advantages such as convenient. The specific structure of the guide rail can be selected by a user according to the needs, such as a small-sized four-section guide rail structure and the like.

Further, the device power supply 1 is located in the guide rail, the sampling module 2 includes a primary current sampling device, the primary current sampling device includes three rogowski coils 21 for performing differential measurement, the three rogowski coils are respectively denoted by 21A, 21B and 21C in fig. 1, secondary output ends of the three rogowski coils 21 are all connected to a metering chip to output a di/dt differential signal output by the secondary to the metering chip, and an integrating circuit is built in the metering chip. Specifically, the metering chip adopts a high-precision V9203 chip with an integrating circuit.

The ammeter adopts external large-current flexible Rogowski coil 21 as a primary current sampling device, the maximum current can reach 2000A (the Rogowski coil 21 can be adjusted to 10000A), and meanwhile, a metering chip with an integrating circuit is adopted in the ammeter to carry out integral reduction on differential signals of the external Rogowski coil 21. The guide rail type electric meter has the advantage of small volume, and the Rogowski coil 21 is sampled and applied to the guide rail type electric meter by utilizing the characteristic of the guide rail type electric meter, so that the perfect combination of small volume and large current is realized.

Further, the processing module 8 comprises an SOC chip with a high-speed Cortex-MO core, and the specific model of the SOC chip is HT6015, which can provide a high-precision low-power clock as a time standard for rate control, and at the same time, the integrated display module 4 directly drives the ultra-wide temperature liquid crystal display. The metering chip is communicated with the SOC chip through the SPI, and instantaneous parameters such as three-phase current, voltage and power and related waveform data can be provided.

Specifically, as shown in fig. 2 and 3, the sampling module 2 includes a voltage sampling circuit and a current sampling circuit, and the current sampling circuit includes a primary current sampling device. Three rogowski coils 21 are connected at JS4, JS5, and JS6 in fig. 3, respectively.

Preferably, this ammeter still includes the reserve battery 9 that can supply power for RTC (real time clock), and metering module 3 and processing module 8 all connect in reserve battery 9, and reserve battery 9 can guarantee the long-time normal operating of clock under the condition of having a power failure.

The embodiment adopts a guide rail installation mode, adopts Rogowski coil differential measurement, can directly measure and meter under a large current occasion, such as 2000A power utilization occasion, does not need steps of proportion setting and the like, and reduces troubles of intermediate conversion and setting. And the flexible Roche coil is convenient and simple to install, and the guide rail type structure has small volume.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although the device power supply 1 is used more herein; a sampling module 2; a Rogowski coil 21; a metering module 3; a display module 4; an infrared communication module 5; an RS485 bus 6; a touch module 7; a processing module 8; spare battery 9, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. The utility model provides a three-phase four-wire rogowski coil heavy current guide rail table, includes the ampere meter body, the ampere meter body includes device power (1), sampling module (2), metering module (3), processing module (8) and display module (4), metering module (3) include the measurement chip, its characterized in that, the ampere meter body is installed on the guide rail, and device power (1) is located in the guide rail, sampling module (2) include once current sampling device, once current sampling device includes three rogowski coils (21), the secondary output of rogowski coil (21) all connect in the measurement chip is in order to export the differential signal of secondary output to the measurement chip, the measurement chip embeds there is integrator circuit;

the device also comprises a standby battery (9) capable of supplying power to the RTC, and the metering module (3) and the processing module (8) are both connected to the standby battery (9);

and the ammeter housing has a touch module (7) connected to said processing module (8).

2. The three-phase four-wire rogowski coil high current rail gauge of claim 1, in which the gauge chip is of type V9203.

3. The three-phase four-wire rogowski coil high current rail gauge of claim 2, wherein the processing module (8) comprises a SOC chip with MO cores.

4. The three-phase four-wire rogowski coil high current rail gauge of claim 3, in which the SOC chip is model HT 6015.

5. The three-phase four-wire rogowski coil high current rail gauge of claim 4, in which the gauge chip is communicatively coupled to the SOC chip via an SPI communication bus.

6. The three-phase four-wire rogowski coil high current rail gauge of claim 1, in which the sampling module (2) comprises a voltage sampling circuit and a current sampling circuit, the current sampling circuit comprising the primary current sampling device.

7. The three-phase four-wire rogowski coil high current rail gauge of claim 6, in which the device power supply (1) comprises a high voltage type switching power supply having an isolated withstand voltage output of at least 4.5 KV.

8. The three-phase four-wire rogowski coil high current rail gauge according to claim 7, characterized in that an infrared communication module (5) and an RS485 bus (6) are connected to the processing module (8).