CN111697843A - Voltage and current output circuit for passive secondary loop inspection source - Google Patents
Voltage and current output circuit for passive secondary loop inspection source Download PDFInfo
- Publication number
- CN111697843A CN111697843A CN202010637017.3A CN202010637017A CN111697843A CN 111697843 A CN111697843 A CN 111697843A CN 202010637017 A CN202010637017 A CN 202010637017A CN 111697843 A CN111697843 A CN 111697843A
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- 238000007689 inspection Methods 0.000 title claims abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
- H02M5/12—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion of voltage or current amplitude only
-
- 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
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a voltage and current output circuit for a passive secondary circuit inspection source, which comprises an input unit, a transformer unit and an output unit, wherein the circuit converts three paths of input signals into three-phase four-wire system voltage output and three-phase current output, the input and output circuits support various wiring modes and provide a test power supply for PT and CT of a secondary metering circuit, the input unit circuit consists of an A-phase input, a B-phase input, a C-phase input and six terminals, three groups of inputs are arranged on the primary side of the transformer unit and used for inputting three-phase power signals, a three-phase four-wire voltage group and a three-phase heavy current output group are arranged on the secondary side of the transformer unit and used for driving the PT and CT to be tested at the later stage, and the three-phase heavy current output group converts output voltage. The invention converts three-way input signals into three-phase four-wire system voltage output and three-phase current output, the input and output circuits support various wiring modes, the principle is simple, the function is strong, and the invention is very suitable for providing test power supply for PT and CT of a secondary metering loop.
Description
Technical Field
The invention relates to the field of voltage and current output circuits, in particular to a voltage and current output circuit for a passive secondary circuit inspection source.
Background
The voltage and current output circuits of the existing three-phase programmable power supply, the three-phase test source, the three-phase standard source and other power supplies in the current market generally adopt discrete transformers, the converters output the voltage and current respectively, the circuits are generally large in size and heavy, the output voltage is up to 220VRMS, the power consumption is large, the circuits cannot work without an external power supply, the cost is high, and potential safety hazards exist when the circuits are used for testing the power supply of a secondary circuit.
Disclosure of Invention
The present invention is directed to a voltage/current output circuit for a passive secondary circuit inspection source, which solves the above problems.
In order to achieve the purpose, the invention provides the following technical scheme: a voltage and current output circuit for a passive secondary circuit inspection source comprises an input unit, a transformer unit and an output unit, wherein three paths of input signals are converted into three-phase four-wire system voltage output and three-phase current output by the circuit, and the input and output circuit supports various wiring modes and provides a test power supply for PT and CT of a secondary metering circuit.
Preferably, the input unit circuit consists of an a-phase input, a B-phase input, a C-phase input and six terminals, and the six terminals can adapt to various access modes, namely three independent power signal access modes, a three-phase four-wire system access mode and a three-phase three-access mode;
preferably, the transformer unit has three sets of inputs on the primary side for inputting three-phase power signals, a three-phase four-wire voltage set and a three-phase heavy current output set on the secondary side for driving the post-stage test PT and CT, and the three-phase heavy current output set converts output voltage into current signals through a current-limiting resistor, and converts three-phase input power signals into three-phase four-wire output voltage signals and three-phase independent heavy current signals for outputting.
Preferably, the output unit circuit has a three-phase four-wire system voltage output formed by terminals UA, UB, UC and U, and a current output loop formed by terminals Ia, Ib and Ic, and is applied to detection of a three-phase three-PT and CT secondary loop and detection of a three-phase four-PT and CT secondary loop through combination of the seven terminals.
The invention has the technical effects and advantages that:
the three-way input signal is converted into a three-phase four-wire system voltage output and a three-phase current output, the input and output circuit supports various wiring modes, the principle is simple, the function is strong, the test power supply is very suitable for providing a test power supply for PT and CT of a secondary metering loop, the power consumption is low, the cost is low, and the potential safety hazard can be reduced when the test power supply is used for testing the secondary loop.
Drawings
Fig. 1 is a circuit diagram illustrating the operation principle of the present invention.
Fig. 2 is a circuit diagram of an exemplary three-phase four-input application of the present invention.
Fig. 3 is a circuit diagram of an exemplary three-phase three-input application of the present invention. .
In the figure: 1. an input unit; 2. a transformer unit; 3. and an output unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a voltage and current output circuit for a passive secondary loop inspection source as shown in figures 1-3, which comprises an input unit 1, a transformer unit 2 and an output unit 3, the working principle refers to figure 1, the circuit has the advantages that three paths of input signals are converted into three-phase four-wire system voltage output and three-phase current output, the input and output circuits support various wiring modes, the principle is simple, the function is strong, and a test power supply is provided for PT and CT of a secondary metering loop;
as shown in fig. 1, the input unit 1 has a circuit composed of an a-phase input, a B-phase input, a C-phase input, and six terminals, and the six terminals can adapt to various access modes, such as: three independent power signal accesses, three-phase four-wire system accesses, three-phase three-wire system accesses, and input application refers to fig. 1, fig. 2, and fig. 3 as examples;
the principle of the transformer unit 2 is shown in fig. 1, the transformer unit has three groups of inputs (three groups of inputs refer to not only three input coils as shown in fig. 1, but also each group can be composed of a plurality of coils) on the primary side for inputting three-phase power signals, a three-phase four-wire voltage group (three groups of four-wire voltage refer to not only three voltage coils as shown in fig. 1, each group can also be composed of a plurality of coils) and a three-phase large current output group (three-phase large current output group refer to not only three current coils as shown in fig. 1, each group can also be composed of a plurality of coils) for driving the post-stage test PT and CT, the three-phase large current output group converts the output voltage into current signals through a current-limiting resistor, converts the three-phase input power signals into three-phase four-wire output voltage signals and three-phase independent large current signals, the portable solar water heater has the advantages of small volume, light weight, low cost, low power consumption and convenient carrying;
the output unit 3 is shown in fig. 1, the circuit is composed of UA, UB, UC and U0 terminals to form a three-phase four-wire system voltage output, and Ia0, Ib0 and Ic0 terminals to form a current output loop, and the combination of the seven terminals can be applied to the detection of a three-phase three PT and CT secondary loop and the detection of a three-phase four PT and CT secondary loop, and the typical output application refers to fig. 2 and fig. 3 for example;
the main technical indexes are as follows:
(1) three-phase UA, UB, UC voltage output scope: 0V to 36V effective value;
(2) three-phase Ia0, Ib0, Ic0 current output range: 0A to 10A effective value;
(3) the three-phase voltage and current output are compatible at the same time: a three-phase three PT, CT metering loop and a three-phase four PT, CT metering loop;
(4) the three groups of A, B, C phase input modes are as follows: three-phase three-access, three-phase four-access and independent access.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (4)
1. A voltage and current output circuit for a passive secondary circuit inspection source comprises an input unit (1), a transformer unit (2) and an output unit (3), wherein the circuit converts three-way input signals into three-phase four-wire system voltage output and three-phase current output, and the input and output circuit supports multiple wiring modes and provides a test power supply for PT and CT of a secondary metering circuit.
2. The voltage-current output circuit for the passive secondary loop check source according to claim 1, wherein the input unit (1) circuit is composed of an A-phase input, a B-phase input, a C-phase input and six terminals, and the six terminals can adapt to a plurality of access modes, namely three independent power signal access, three-phase four-wire access and three-phase three-access.
3. The voltage-current output circuit for a passive secondary circuit inspection source according to claim 1, wherein the transformer unit (2) has three input sets on the primary side for three-phase power signals, and three-phase four-wire voltage sets and three-phase large-current output sets on the secondary side for driving the post-stage tests PT and CT, and the three-phase large-current output sets convert the output voltages into current signals through current-limiting resistors, convert the three-phase input power signals into three-phase four-wire output voltage signals and three-phase independent large-current signal outputs.
4. The voltage-current output circuit for passive secondary circuit inspection source as claimed in claim 1, wherein said output unit (3) circuit has three-phase four-wire system voltage output composed of terminals UA, UB, UC and U0, terminals Ia0, Ib0 and Ic0 constituting current output circuit, which is applied to detection of three-phase three PT, CT secondary circuit and detection of three-phase four PT, CT secondary circuit by combination of these seven terminals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010637017.3A CN111697843A (en) | 2020-07-03 | 2020-07-03 | Voltage and current output circuit for passive secondary loop inspection source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010637017.3A CN111697843A (en) | 2020-07-03 | 2020-07-03 | Voltage and current output circuit for passive secondary loop inspection source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111697843A true CN111697843A (en) | 2020-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010637017.3A Pending CN111697843A (en) | 2020-07-03 | 2020-07-03 | Voltage and current output circuit for passive secondary loop inspection source |
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| CN (1) | CN111697843A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105075092A (en) * | 2013-11-14 | 2015-11-18 | 崇实大学校产学协力团 | Multi-output converter and control method therefor |
| JP2017188974A (en) * | 2016-04-01 | 2017-10-12 | 株式会社ダイヘン | Welding power supply |
| CN110967579A (en) * | 2019-11-06 | 2020-04-07 | 国网浙江省电力有限公司衢州供电公司 | Test source of no-load metering loop automatic detection equipment |
-
2020
- 2020-07-03 CN CN202010637017.3A patent/CN111697843A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105075092A (en) * | 2013-11-14 | 2015-11-18 | 崇实大学校产学协力团 | Multi-output converter and control method therefor |
| JP2017188974A (en) * | 2016-04-01 | 2017-10-12 | 株式会社ダイヘン | Welding power supply |
| CN110967579A (en) * | 2019-11-06 | 2020-04-07 | 国网浙江省电力有限公司衢州供电公司 | Test source of no-load metering loop automatic detection equipment |
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Application publication date: 20200922 |