CN103424596A - Acquiring and amplifying device of passive AC micro-current - Google Patents

Abstract

Passive AC micro-current acquisition and amplification device, passive AC micro-current acquisition and amplification device, including multi-winding insulated coils, respectively extracting coil taps with N times the number of turns from the coils and connecting them to the lead-out terminals of the device, the lead-out terminals of the device are divided into common terminals 0 , 1N-6N multiple terminals, discharge display lamps and discharge tubes are connected between the common terminal 0 and the 1N-6N lead-out terminals respectively, the wiring plug is connected to the lead-out terminals of the device through the test line, and the entire amplifying device is placed in a box with a cover Insulated plastic device housing. The invention greatly improves the working efficiency, and the manufacturing cost of the device is low, so it has certain application and popularization value.

Description

Passive AC Microcurrent Acquisition and Amplification Device

technical field

The invention relates to the field of an electrical parameter tester for electrical equipment, in particular to a passive AC micro-current acquisition and amplification device.

Background technique

With the continuous increase of social electricity consumption, large, medium and small substations have been built and put into power transmission. According to the electric power regulations, the electrical parameters of the equipment after power transmission should be tested with load, commonly known as "phasor analysis". Through phasor analysis, it can be judged whether the wiring polarity, group, transformation ratio, and direction of the electrical equipment are correct, so as to ensure the safe and reliable operation of the electrical equipment after power transmission.

At present, the phasor analysis products of various manufacturers are only suitable for secondary currents above 0.15-0.2A. For currents below 0.15A, the measurement results are unstable, there is a large digital drift phenomenon, and the transformation ratio and direction cannot be accurately judged. For the correctness of the parameters, it is necessary to wait for the line to carry a certain load before performing phasor analysis, and sometimes it takes a long time to wait for the user to carry the load. In order to ensure the safe operation of the equipment after power transmission, some useless loads are even used to obtain the load current, which leads to the risk of load reversal operation, long waiting time, and waste of electric energy. Furthermore, as the loop current increases, the open-circuit voltage increases accordingly, and once the work is wrong, it is very easy to endanger the safety of people and equipment.

Contents of the invention

The object of the present invention is to solve the above-mentioned problems, providing a passive AC micro-current acquisition and amplification device, which uses the no-load load micro-current of the line itself and the capacitance to the ground, generally below 0.15A, to carry out this micro-current N times selective amplification to simulate the user's live load, and test the load electrical parameters of the equipment after power transmission, commonly known as "phasor analysis". Through phasor analysis, the wiring polarity, group, transformation ratio, Whether the direction is correct, to ensure the safe and reliable operation of electrical equipment after power transmission, safe and efficient.

In order to achieve the above object, the present invention adopts the following technical solutions to achieve:

Passive AC micro-current acquisition and amplification device, including multi-winding insulated coils, extracting coil taps with N times the number of turns from the coils and connecting them to the lead-out terminals of the device, and the extraction coefficient of each gear is N=5; the lead-out terminals of the device are divided into common terminals and 1N -6N times terminal, different terminals correspond to different magnifications of the current coil. A discharge display lamp and a discharge tube protection are connected in parallel between the lead-out terminals of two adjacent devices. The discharge display lamp emits light to remind the staff of danger during open circuit discharge; the discharge tube protection can break down when an open circuit generates overvoltage, and the protection Personal and equipment safety. The wiring plug is connected to each required lead-out terminal of the device through the test line. Most of the components of the entire amplification device are placed in the insulating plastic device shell with a box cover, and only the sensing head part is exposed.

The beneficial effects of the present invention are: for equipment with small load, no-load, transformer, electric railway line and CT transformation ratio coefficient, etc., the advantages of the present invention are brought into full play. "Small inventions, big things" has been truly reflected in the actual work on site, and it is particularly effective in saving manpower and material resources and increasing the speed of power transmission. At the same time, the direct economic benefits, social benefits and corporate image have also been greatly improved. The device has low manufacturing cost and has certain application and promotion value.

Description of drawings

Fig. 1 is a schematic diagram of the principle of the single-phase single-winding formula of the present invention;

Fig. 2 is a schematic diagram of the physical wiring of the single-phase single-winding type of the present invention;

Fig. 3 is the three-phase three-winding type physical connection schematic diagram of the present invention;

Figure 4 is a schematic diagram of field wiring of a single-phase device;

Figure 5 is a schematic diagram of field wiring of a three-phase device.

In the figure: 1 multi-winding insulated coil, 2 discharge display lamp, 3 discharge tube protection, 4 device 0-N lead terminal, 5 external wiring plug, 6 test line, 7 device shell, 8 box cover, 9 current caliper, 10 analysis Instrument, 11, box lining board, 12 anti-collision/grinding outer casing

Detailed ways

In order to make the technical means, creative features, goals and effects of the present invention easy to understand, and the basic electrical principles of single-phase and three-phase are the same, the present invention will be further described below in conjunction with single-phase specific diagrams.

Figure 1, Figure 2, Figure 3, Figure 4, and Figure 5 are schematic diagrams of the principle and physical wiring, taking Figure 2 as an example:

The passive AC micro-current acquisition and amplification device extracts coil taps with N times the number of turns from the multi-winding insulated coil 1 and connects them to the device lead-out terminals 4 (0-N). Currently, N=5 is selected, and the device lead-out terminals are 4 points It is the lead-out terminal of the common terminal 0, 1N-6N times, and different terminals correspond to different N times amplification factors of the current coil. Between the lead-out terminal 4 (common terminal 0) of two adjacent devices and each lead-out terminal (1N-6N) are respectively connected in parallel with a discharge display lamp 2 and a discharge tube 3, and the discharge display lamp 2 emits light to remind the staff during open-circuit discharge If there is danger, the discharge tube 3 will break down when an open circuit generates an overvoltage, so as to protect the safety of people and equipment. The wiring plug 5 is connected to the lead-out terminal 4 (0-6N) of the device through the test line 6, and the wiring plug 5 is connected to the current terminal in the external current circuit. In the device casing 7, the device casing 7 is made of insulating plastic, and 11 is a box inner lining board for fixing the main coil, and only part of the current main coil is exposed on the top of the lining board, which can effectively protect the current main coil, the discharge tube 3, and the device lead-out terminal 4 etc., 12 is the anti-collision/grinding outer casing, which protects the exposed part of the main coil from being damaged by external forces such as collision and friction.

Use the current caliper 9 attached with the output line to send the collected AC current data to the analyzer 10 for processing.

Using the principle of electromagnetic induction, the collected current flows through the current caliper 9 in the same direction multiple times, and the magnetic flux generated by it is amplified by N times. The analyzer can accurately measure the magnitude and phase of the micro-current. Even if the secondary current loop is open due to a mistake in the work, the device is connected with an overvoltage protection element inside. When the overvoltage protection element exceeds 48V, it will discharge. Lighting reminds staff to check the circuit. At the same time, the breakdown insurance will be broken down to protect people and equipment from injury. The device is designed with single-phase and three-phase types, which can be used flexibly according to the site.

Above shows and described basic principle of the present invention and main feature and the advantage of the present invention, those skilled in the art should understand that, the present invention is not limited by above-mentioned embodiment, what described in above-mentioned embodiment and description just illustrates the present invention Principle, under the premise of not departing from the spirit and scope of the present invention, the present invention also has various changes and improvements, and these changes and improvements all fall within the claimed scope of the present invention, and the claimed protection scope of the present invention is defined by the appended claims Requirements and their equivalents are defined.

Claims (1)

1. the micro-current acquisition multiplying arrangement of passive interchange, it is characterized in that, the micro-current acquisition multiplying arrangement of passive interchange, comprise many winding insulations coil, the coil tap that extracts respectively the N times of number of turn from coil is connected to the device leading-out terminal, the device leading-out terminal divides public terminal, 1N-6N times terminal, at public terminal respectively and between each leading-out terminal and be connected to electric discharge display lamp and discharge tube, connection plug line by experiment is connected to the device leading-out terminal, and whole multiplying arrangement is placed in the ambroin crust of the device with lid.

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