CN203433017U - Three-phase opening-closing CT electric energy meter - Google Patents
Three-phase opening-closing CT electric energy meter Download PDFInfo
- Publication number
- CN203433017U CN203433017U CN201320570623.3U CN201320570623U CN203433017U CN 203433017 U CN203433017 U CN 203433017U CN 201320570623 U CN201320570623 U CN 201320570623U CN 203433017 U CN203433017 U CN 203433017U
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- close type
- open
- electric energy
- energy meter
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Abstract
Disclosed in the utility model is a three-phase opening-closing CT electric energy meter comprising a management MCU, a metering chip, and an opening-closing CT. The opening-closing CT, which is connected with a current sampling circuit of the metering chip by a difference cable, transmits a secondary current that is obtained by conversion to the sampling circuit of the metering chip; and the metering chip is connected with the management MCU by an SPI bus. Hot-line work can be carried out on the provided electric energy meter; and a primary circuit is not needed to be disconnected. Moreover, the opening-closing CT can be installed at any position of a tested circuit; the operation is convenient; the metering precision is high; and the performance is stable and reliable. Therefore, the provided electric energy meter can be widely applied to electrical parameter measuring and metering occasions like on-line detection and field verification and the like.
Description
Technical field
The utility model relates to a kind of three-phase electric energy meter, particularly a kind of three-phase open-close type CT electric energy meter.
Background technology
The CT that common three-phase electric energy meter is used is totally enclosed type CT, during use, current channel must be serially connected on test line, can not arbitrarily move, therefore, common three-phase meter cannot be applied to the occasion that those can not open-circuit line, as occasions such as online detection, field-checkings.
Utility model content
The purpose of this utility model is to provide a kind of portable reliable three-phase open-close type CT electric energy meter.
This three-phase open-close type CT electric energy meter that the utility model provides, comprise management MCU, computation chip, this electric energy meter also comprises open-close type CT, open-close type CT is connected with the current sampling circuit of computation chip by difference cable, and the secondary current that its conversion is obtained is transferred to the sample circuit of computation chip; Described computation chip is connected with management MCU by spi bus.
Described open-close type CT comprises A phase open-close type CT, B phase open-close type CT and C phase open-close type CT, and these three open-close type CT are connected with A phase current sampling circuit, B phase current sampling circuit and the C phase current sampling circuit of computation chip by difference cable respectively.Described open-close type CT can be arranged on the optional position of test line at any time, need not be serially connected in test line regularly.Described computation chip adopts the computation chip that the model of IDT company is IDT90E36.
The utility model can hot line job, and without disconnecting primary line circuit, and open-close type CT can install in the optional position of test line, and easy to operate, measuring accuracy is high, stable and reliable for performance.The utility model can be widely used in the occasion of the electric parameter measurements such as online detection, field-checking and metering.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model.
Embodiment
As shown in Figure 1, the utility model comprises management MCU, computation chip and open-close type CT.When practical application, open-close type CT of the present utility model, comprise A phase open-close type CT, B phase open-close type CT and C phase open-close type CT, these three open-close type CT are connected with A phase current sampling circuit, B phase current sampling circuit and the C phase current sampling circuit of computation chip by difference cable respectively.Computation chip is connected with management MCU by high speed SPI bus.
It is IDT90E36 computation chip that computation chip adopts the model of IDT company, and it has wide region, high-precision feature.Computation chip of the present utility model is measured and is measured the electrical quantity of circuit.
Open-close type CT of the present utility model is installed on test line, and the secondary current obtaining by this CT conversion is transferred to the current sampling circuit of computation chip through difference cable, and the voltage of the circuit of three-phase circuit is the voltage sampling circuit to computation chip through cable transmission; These current signals and voltage signal, after over-sampling conditioning, are converted into the voltage signal that meets computation chip input requirements; Computation chip carries out a series of processing such as PGA amplification, ADC sampling, compensation, filtering, DSP computing to the voltage signal of input; Then the data after its processing regularly read by spi bus by managing MCU, and do further processing by management MCU.
Power supply of the present utility model is divided into power circuit, RS485 communication power supply circuit, clock and low-power consumption battery three parts of management MCU and computation chip and relevant portion.Front two-part power supply is to obtain by processing such as three-phase voltage transformation, rectification, filtering, and clock and low-power consumption battery are to provide separately.
Demonstration of the present utility model and key-press module can be realized human-computer interaction function, show and inquire about various electric parameters, logout, status information, user profile.Communication module comprises one or several in RS485, far infrared, nearly outer, GPRS, GSM, CDMA, small wireless, Ethernet, mainly complete information between ammeter and other peripherals alternately and setting parameter.Clock module provides clock accurately and reliably for electric energy meter, also for electric energy meter time-shared charge, logout etc. provide markers.Storer is used for storing the data messages such as electricity consumption data, monitor event record, load record and parameter configuration.CF pulse module provides the port of calibrating electric energy meter measuring accuracy.
Claims (4)
1. a three-phase open-close type CT electric energy meter, comprise management MCU, computation chip, it is characterized in that, this electric energy meter also comprises open-close type CT, open-close type CT is connected with the current sampling circuit of computation chip by difference cable, and the secondary current that its conversion is obtained is transferred to the sample circuit of computation chip; Described computation chip is connected with management MCU by spi bus.
2. three-phase open-close type CT electric energy meter according to claim 1, it is characterized in that, described open-close type CT comprises A phase open-close type CT, B phase open-close type CT and C phase open-close type CT, and these three open-close type CT are connected with A phase current sampling circuit, B phase current sampling circuit and the C phase current sampling circuit of computation chip by difference cable respectively.
3. three-phase open-close type CT electric energy meter according to claim 1, is characterized in that, described open-close type CT can be arranged on the optional position of test line at any time, need not be serially connected in test line regularly.
4. three-phase open-close type CT electric energy meter according to claim 1, is characterized in that, described computation chip adopts the computation chip that the model of IDT company is IDT90E36.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320570623.3U CN203433017U (en) | 2013-09-16 | 2013-09-16 | Three-phase opening-closing CT electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320570623.3U CN203433017U (en) | 2013-09-16 | 2013-09-16 | Three-phase opening-closing CT electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203433017U true CN203433017U (en) | 2014-02-12 |
Family
ID=50062045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320570623.3U Expired - Lifetime CN203433017U (en) | 2013-09-16 | 2013-09-16 | Three-phase opening-closing CT electric energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203433017U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771424A (en) * | 2015-11-25 | 2017-05-31 | 湖南开磷雁峰塔涂料有限公司 | The Multifunctional three-phase ammeter of the anti-strong magnetic of coating material production computer room |
-
2013
- 2013-09-16 CN CN201320570623.3U patent/CN203433017U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771424A (en) * | 2015-11-25 | 2017-05-31 | 湖南开磷雁峰塔涂料有限公司 | The Multifunctional three-phase ammeter of the anti-strong magnetic of coating material production computer room |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140212 |