CN204731360U - A kind of current transformer polarity rapid verification instrument - Google Patents

Abstract

The utility model discloses a current transformer polarity rapid calibrator, the insulating plastic casing (13) is provided with a battery connection terminal L1 (4), and the battery connection terminal L1 (4) is connected to a battery on-off switch (1). , the battery on-off switch (1) is connected to the battery pack (10), the battery pack (10) is connected to the battery terminal L2 (5), the ammeter terminal K1 (8) is connected to the pointer ammeter (6), and the pointer ammeter (6) Connect the red LED light (2) and the green LED light (3) respectively, the red LED light (2) is connected to the first switching diode (11), the green LED light (3) is connected to the second switching diode (12), the first switching diode (11) and the second switching diode (12) are both connected to the terminal K2 (9) of the ammeter. The utility model has the advantages of simple structure, convenient installation, portability, time-saving and labor-saving, intuitive experimental results, fast and accurate calibration.

Description

A Quick Calibrator for Polarity of Current Transformer

Technical field:

The invention relates to a quick current transformer polarity calibrator, which is widely used in electric power system current transformer polarity calibrating tests, and belongs to the field technical field of substation maintenance.

Background technique:

At present, the on-site calibration of current transformers is mostly completed by pointer multimeter + dry battery pack + test line. During on-site operation, one person holds the dry battery pack, one person holds the pointer multimeter connected to the secondary side of the transformer, and one person Touch the terminal board of the primary side of the current transformer with the test line on the switch body, and observe the swing of the pointer of the multimeter during the touch. It takes three people to operate and takes a long time. The on-site operation is cumbersome, and two people are required to cooperate at the moment of a side touch. Once there is a disconnection or observation is not timely, it is easy to determine the direction of the pointer swing, resulting in multiple tests for the same winding. And it is very likely that there will be deviations in the calibration mainly relying on the cooperation of personnel.

Invention content:

The object of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a quick current transformer polarity calibrator with simple structure, convenient installation, portability, time saving and labor saving, intuitive experimental results, fast and accurate calibration.

The purpose of the present invention can be achieved through the following measures: a current transformer polarity quick calibrator, which includes an insulating plastic shell, is characterized in that the insulating plastic shell is provided with a battery on-off switch, a pointer ammeter, a red LED light , green LED light, battery terminal L1, battery terminal L2, ammeter terminal K1, ammeter terminal K2, the insulating plastic shell is connected to the battery pack through the battery card slot, and the insulating plastic shell is equipped with a first switching diode and a second switching diode. The switch diode, the battery terminal L1 is connected to the battery on-off switch, the battery on-off switch is connected to the battery pack, the battery pack is connected to the battery terminal L2, the ammeter terminal K1 is connected to the pointer ammeter, and the pointer ammeter is respectively connected to the red LED light and the green LED light , the red LED light is connected to the first switching diode, the green LED light is connected to the second switching diode, and both the first switching diode and the second switching diode are connected to the terminal K2 of the ammeter.

Compared with the prior art, the present invention can produce the following positive effects: the present invention can quickly perform polarity verification by connecting the test circuit with the externally applied test line and the test line clamp in advance, and the test results can be visualized through the red LED light and the green LED light Report to the tester. Has the following characteristics:

1. Simple structure. The invention includes an internal control part, a status display part, a shell part and the like. The internal control part is composed of a battery pack and a battery on-off switch. The status display part is composed of a red LED light, a green LED light, two switching diodes and a pointer ammeter; the shell part is an insulating plastic shell. The accessory part when it is used is composed of test line and test line clamp;

2. Reduce test operators and save labor. The utility model is provided with a battery card slot and a current connection terminal connected to a test line, which saves the staff specially connected to the dry battery pack. The invention additionally attaches a test line and a test line clamp, which can fix the test line on the primary side of the current transformer in advance.

3. Shorten test time and improve work efficiency. The invention is provided with a battery on-off switch, and one person can perform the on-off work of the direct current instantaneous current on the primary side, and simultaneously observe the swing situation of the pointer of the ammeter, so as to eliminate the deviation caused by the cooperation of personnel.

4. The test results are accurate and clear. The invention is provided with red and green indicator lights, so that the polarity verification result of the current transformer can be seen more intuitively.

5. The test span is flexible. The invention can be operated in a narrow space or between long-distance equipment such as across intervals. The product is small in size, easy to place and carry.

Description of drawings:

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the circuit schematic diagram of the battery connection terminal part of the present invention;

Fig. 3 is a schematic circuit diagram of the LED lamp part of the present invention.

Fig. 4 is the electrical principle schematic diagram during positive polarity test of the present invention;

Detailed ways:

The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing:

Embodiment: A current transformer polarity rapid calibrator (see Figure 1-Figure 4), which includes an insulating plastic shell 13, on which is provided a battery on-off switch 1, a pointer ammeter 6, and a red LED Light 2, green LED light 3, battery connection terminal L14, battery connection terminal L25, ammeter connection terminal K18, ammeter connection terminal K29, in the insulating plastic shell 13, connect the battery pack 10 through the battery card slot, and the insulating plastic shell 13 is provided with a second A switching diode 11, a second switching diode 12, the battery terminal L14 is connected to the battery on-off switch 1, the battery on-off switch 1 is connected to the battery pack 10, the battery pack 10 is connected to the battery terminal L25, and the ammeter terminal K18 is connected to the pointer ammeter 6 , the pointer ammeter 6 is respectively connected to the red LED lamp 2 and the green LED lamp 3, the red LED lamp 2 is connected to the first switching diode 11, the green LED lamp 3 is connected to the second switching diode 12, the first switching diode 11, and the second switching diode 12 Both are connected to ammeter terminal K29.

When in use, lead the battery terminal 4, 5 to the primary winding side of the current transformer through the test line, and fix it on the primary winding side P1, P2 with the test test line clamp; lead the current terminal 8, 9 to the current transformer through the test line On the secondary winding side S1, S2 of the device. The battery pack 10 is composed of 4 No. 1 batteries, the battery on-off switch 1 is made of the red LED light 2 and the green LED light 3 of the micro button switch state display part, and the 330MR2C type LED light is selected for use, and the pointer ammeter 6 is selected for use. MF47C type pointer meter.

Positive polarity test:

Fix the battery terminals 4 and 5 on the primary side P1 and P2 of the current transformer through the test line and the test line clamp, wherein the battery terminal 4 is connected to the P1 end of the primary side of the current transformer, and the battery terminal 5 is connected to the current transformer. The P2 terminal on the primary side of the transformer; lead the current terminal 8 and 9 to the secondary side S1 and S2 of the current transformer through the test line, the current terminal 8 is connected to the S1 terminal on the secondary side of the current transformer, and the current terminal 9 Connected to the S2 terminal of the secondary side of the current transformer. At this time, the battery on-off switch 1 is used to simulate the moment when the primary current passes through. The current connection terminal 9 flows out to make the whole loop conduction, and the red LED light 2 is on. The green LED lamp 3 is disconnected due to the blocking effect of the switching diode 12, and the green LED lamp 3 is not bright.

Reverse polarity test:

Fix the battery terminals 4 and 5 on the primary side P2 and P1 of the current transformer through the test line and the test line clamp, wherein the battery terminal 4 is connected to the P2 terminal of the primary side of the current transformer, and the battery terminal 5 is connected to the current transformer. Connect the current terminal 8 and 9 to the secondary side S1 and S2 of the current transformer through the test line, connect the current terminal 8 to the S2 terminal on the secondary side of the current transformer, and connect the current terminal 9 to the secondary side of the current transformer. Connected to the S1 terminal of the secondary side of the current transformer. At this time, use the battery on-off switch 1 to simulate and control the moment when the primary current passes through. The current flows in from the current terminal 9 through the test line, the pointer of the pointer ammeter 6 is reversely biased, the green light circuit is turned on through the switch diode 12, and the current passes through the test line. The connection terminal 8 flows out, so that the whole loop is conducted, and the green LED light 3 is bright. Due to the blocking effect of the switching diode 11, the red LED lamp 2 disconnects the circuit, and the red LED lamp 2 is not bright.

Claims (1)

1. a current transformer polarity rapid verification instrument, it comprises ambroin shell (13), it is characterized in that ambroin shell (13) is provided with Cell On-Off switch (1), indicator type current meter (6), red LED lamp (2), green LED lamp (3), battery terminal L1(4), battery terminal L2(5), ammeter wiring terminal K1(8), ammeter wiring terminal K2(9), electric battery (10) is connected by battery draw-in groove in ambroin shell (13), the first switching diode (11) is provided with in ambroin shell (13), second switch diode (12), battery terminal L1(4) connect Cell On-Off switch (1), Cell On-Off switch (1) connects electric battery (10), electric battery (10) connects battery terminal L2(5), ammeter wiring terminal K1(8) concatenation pointer formula reometer (6), indicator type current meter (6) connects red LED lamp (2) respectively, green LED lamp (3), red LED lamp (2) connects the first switching diode (11), green LED lamp (3) connects second switch diode (12), first switching diode (11), second switch diode (12) all connects ammeter wiring terminal K2(9).