CN115792775A - 10kV high-voltage combined transformer detection device - Google Patents

Abstract

The invention discloses a 10kV high-voltage combined transformer detection device in the technical field of high-voltage combined transformer detection. The high-voltage cable is equipped with a connecting sleeve, the output end of the standard current transformer is connected to the meter box through a wire, the meter box and the electric control box are connected by wireless transmission, and the current transformer group An ammeter is connected through a wire, and the ammeter and the connecting sleeve are connected with a cable clamp through a wire, and the standard current transformer is electrically connected with the electric control box through a wire, which can be used without changing the circuit wiring and without directly contacting the high-voltage equipment. Online detection of high-voltage CT transformation ratio and basic error under normal circumstances greatly improves the efficiency of CT fault analysis, ensures the independence of detection of current transformers on high-voltage cables, and ensures the safety and accuracy of on-site detection.

Description

10kV high voltage combined transformer detection device

technical field

The invention relates to the technical field of high-voltage combined transformer detection, in particular to a detection device for a 10kV high-voltage combined transformer.

Background technique

10KV is a voltage of 10,000 volts. High-voltage power refers to the electrical connection line with an AC voltage of more than 1000V or a DC voltage of more than 1500V. The combined transformer is actually a combination of a voltage transformer and a current transformer. It can be A combination of one voltage transformer and one current transformer for measuring single-phase power; it may be a combination of two voltage transformers and two current transformers for measuring three Phase power; it can also be a combination of three voltage transformers and three current transformers, used for three-phase electrical measurement, the combined transformer generally plays a role in energy measurement in the high-voltage power grid, combined transformers and voltage transformers and current mutual inductance Like the transformer, the secondary output can be connected to the load, but the load should generally not exceed the nominal rated load of the transformer.

In 10kV high-voltage equipment, it is more dangerous to adopt conventional methods for online detection of high-voltage current transformers (CT), so it is difficult to judge hidden dangers caused by high-voltage CT failures, and traditional on-site calibration equipment must be powered off, and the operation is complicated , The detection equipment is bulky (standard CT, up-current source, etc. are required), which is extremely inconvenient in fault analysis and hidden danger judgment. For this reason, we propose a 10kV high-voltage combined transformer detection device.

Contents of the invention

The purpose of the present invention is to provide a detection device for a 10kV high-voltage combined transformer to solve the problems raised in the above-mentioned background technology.

In order to achieve the above object, the present invention provides the following technical solution: 10kV high-voltage combined transformer detection device, the set of current transformers installed on the high-voltage cables, and the current transformers are connected by connecting wires and standard current transformers. The high-voltage cable is equipped with a connecting sleeve, the output end of the standard current transformer is connected to the meter box through a wire, the meter box and the electric control box are connected by wireless transmission, and the current transformer group An ammeter is connected through a wire, the ammeter and the connecting sleeve are connected with a cable clamp through a wire, the two sets of cable clamps are electrically connected with the electric control box, and the standard current transformer is electrically connected with the electric control box through a wire .

Preferably, the connecting wire includes a connecting terminal integrally formed with the current transformer group, the connecting terminal is screwed with a terminal, the terminal is connected with a connecting wire, and the other end of the connecting wire is connected to the ammeter , Standard current transformer connection.

Preferably, the electric meter box is equipped with a current collection sensor group electrically connected to the standard current transformer and the current transformer group, the electrical output of the current collection sensor group is connected to the A/D sensor, and the A/D sensor is electrically connected to the A/D sensor. The electrical output is connected to the current signal conditioning circuit module, the electrical output of the current signal conditioning circuit module is connected to the comparison module, the electrical output of the comparison module is connected to the MCU control module, the electrical output of the MCU control module is connected to the display module, and the MCU The control module is electrically connected to the wireless transmission module bidirectionally, and the wireless transmission module is electrically connected to the electric control box bidirectionally.

Preferably, the connecting sleeve is an insulating protective sleeve, and the connecting sleeve is fixedly sleeved on the high-voltage cable and electrically connected to the high-voltage cable.

Preferably, the current transformer group includes several groups of current transformers with the same structure, and the current transformers are all fixedly assembled on the high-voltage cables, and the number of the connecting sleeves is the same as the number of the current transformers.

Preferably, the current transformers are electrically connected to the input end of the ammeter through connecting wires, and the current transformers are connected in parallel.

Preferably, the connecting sleeves are electrically connected to the electric control box through wires, and the high-voltage cables are connected in parallel.

Preferably, the ammeter, current transformer, high voltage cable, connecting sleeve and electric control box form an electric circuit.

Preferably, the standard transformer, ammeter and electric control box form an electric circuit.

Preferably, the electric meter box has a built-in storage battery, and the electric meter box is equipped with indicator lights corresponding to current transformers and standard current transformers.

Compared with prior art, the beneficial effect of the present invention is:

The structure design of the invention is reasonable, and the high-voltage cable is fixedly equipped with a current transformer group, which can ensure that there is a corresponding independent current transformer on a separate high-voltage cable, avoiding direct contact between personnel and equipment and the high-voltage part, and the current mutual inductance The transformer can be quickly connected to the standard current transformer through the connecting wire, so that the comparison detection of the current transformer on the high-voltage cable can be realized through the standard current transformer, and the comparison result can be directly displayed through the meter box, and the fault can be found and diagnosed in time. And several groups of current transformers are connected in parallel to the circuit, which can measure the primary current and secondary current of the high-voltage cable in real time online, and can display the detection results of the primary current and the secondary current. The fault accuracy is high, and the high-voltage cable The current transformer connects the high-voltage cable to the electric control box circuit based on the connecting wire, connecting sleeve and cable clamp. It can detect the high-voltage CT transformation ratio and basic error online without changing the circuit wiring and directly contacting the high-voltage equipment. Greatly improve the efficiency of CT fault analysis, ensure the independence of the detection of current transformers on high-voltage cables, and ensure the safety and accuracy of on-site detection.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention;

Fig. 2 is the partial structure schematic diagram of the present invention;

Fig. 3 is a partial structural representation of the electric meter box of the present invention;

Fig. 4 is a working principle diagram of the present invention.

In the figure: 1. High voltage cable; 2. Current transformer group; 3. Connecting wire; 31. Connecting terminal; 32. Terminal; 33. Connecting wire; 4. Ammeter; 5. Connecting sleeve; 6. Cable clamp; 7. Electric control box; 8. Standard current transformer; 9. Meter box; 10. Current acquisition sensor group; 11. A/D converter; 12. Current signal conditioning circuit module; 13. Comparison module; 14. MCU control module; 15. a display module; 16. a wireless transmission module.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Figures 1-4, the present invention provides a technical solution: a 10kV high-voltage combined transformer detection device, a current transformer group 2 assembled on a high-voltage cable 1, and the current transformer group 2 is connected by connecting wires 3 and The standard current transformer 8 is connected, the high-voltage cable 1 is equipped with a connecting sleeve 5, the output end of the standard current transformer 8 is connected with the electric meter box 9 through a wire, the electric meter box 9 and the electric control box 7 are connected by wireless transmission, and the current mutual inductance The device group 2 is connected with the ammeter 4 through the wire, and the ammeter 4 and the connection sleeve 5 are connected with the cable clamp 6 through the wire, and the two sets of cable clamps 6 are electrically connected with the electric control box 7, and the standard current transformer 8 is connected with the electric Box 7 is electrically connected.

The connection wire 3 includes a connection terminal 31 integrally formed with the current transformer group 2, the connection terminal 31 is screwed with a terminal 32, the terminal 32 is connected with a connection wire 33, and the other end of the connection wire 33 is connected to the ammeter 4, the standard The current transformer 8 is connected to facilitate the quick installation of the connecting wire 3, and the disassembly operation is simple;

Please refer to Fig. 3, the electric meter box 9 is equipped with a current collection sensor group 10 electrically connected to the standard current transformer 8 and the current transformer group 2, and the electrical output of the current collection sensor group 10 is connected to the A/D sensor 11, and the A/D The electrical output of the sensor 11 is connected to the current signal conditioning circuit module 12, the electrical output of the current signal conditioning circuit module 12 is connected to the comparison module 13, the electrical output of the comparison module 13 is connected to the MCU control module 14, and the electrical output of the MCU control module 14 is connected to the display module 15 , the MCU control module 14 is bidirectionally electrically connected to the wireless transmission module 16, and the wireless transmission module 16 is bidirectionally electrically connected to the electric control box 7, and the standard current transformer 8 and the current transformer group 2 are respectively subjected to high-voltage current through the current collection sensor group 10. Monitoring, the power transformer group 2 and the standard current transformer 8 can provide power supply for the current acquisition sensor group 2, realize digital-to-analog conversion through the A/D converter 11, and realize circuit signal leveling through the current signal conditioning circuit module 12 Processing to ensure the stability of the signal, the comparison module 13 can compare and analyze the data collected by the value on the ammeter 4, the current transformer group 2, and the standard current transformer 8, and then the MCU control module 14 can calculate and process the comparison results, In this way, the abnormality detection of the current measurement can be completed, and the hidden danger of the abnormal current measurement can be found in time, which provides a basis for the operator to make a decision, and realizes the display through the display module 15, and completes the control signal and communication between the electric control box 7 through the wireless transmission module 16 data transmission;

The connecting sleeve 5 is an insulating protective sleeve, and the connecting sleeve 4 is fixedly sleeved on the high-voltage cable 1 and electrically connected to the high-voltage cable 14, so as to facilitate the connection of the high-voltage cable 1 into the circuit while ensuring the connection between the high-voltage cables 1. testing independence;

The current transformer group 2 includes several groups of current transformers with the same structure, and the current transformers are all fixedly assembled on the high-voltage cable 1, and the number of connecting sleeves 5 is the same as the number of current transformers;

The current transformers are electrically connected through the connecting wire 3 and the input end of the ammeter 4, and the current transformers are connected in parallel, and several groups of current transformers are connected in parallel to the circuit, and the meter box 9 and the ammeter 4 can measure the voltage of the high-voltage cable 1 online in real time. Primary current and secondary current, and can display the detection results of primary current and secondary current, with high fault accuracy;

The connecting sleeves 5 are electrically connected to the electric control box 7 through electric wires and the high-voltage cables 1 are connected in parallel;

Ammeter 4, current transformer, high-voltage cable 1, connecting sleeve 5 and electric control box 7 form an electric circuit;

Standard transformer 8, ammeter 4 and electric control box 7 form an electric circuit;

The ammeter box 9 has a built-in storage battery, and the indicator lights corresponding to the current transformer and the standard current transformer 8 are installed on the ammeter box 9, and the comparison results can be directly displayed by the ammeter box 9, and faults can be found and diagnosed in time.

Working principle: When the device is in use, the high-voltage cable 1 is fixedly equipped with a current transformer group 2, which can ensure that there is a corresponding independent current transformer on the separate high-voltage cable 1, and avoid direct contact between personnel and equipment and the high-voltage part. Touch, and the current transformer can be quickly connected to the standard current transformer 8 through the connecting wire 3, so that the comparison detection of the current transformer on the high-voltage cable 1 is realized through the standard current transformer 8, and the comparison result is passed through the meter box 9 It can be directly displayed, and can detect and diagnose faults in time, and several groups of current transformers are connected in parallel to the circuit. The detection result of the secondary current, the fault accuracy is high, and the current transformer on the high-voltage cable 1 connects the high-voltage cable 1 to the circuit of the electric control box 7 based on the connecting wire 3, the connecting sleeve 5, and the cable clamp 6, which can be On-line detection of high-voltage CT transformation ratio and basic error without changing the circuit wiring and without direct contact with high-voltage equipment, greatly improving the efficiency of CT fault analysis, ensuring the independence of the detection of the current transformer on the high-voltage cable 1, and ensuring the accuracy of on-site detection safety and accuracy.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (10)

1.10kV high voltage combination mutual inductor detection device, its characterized in that: current transformer group (2) of assembly on high-voltage cable (1) is established to the cover, just current transformer group (2) is connected through connecting wire (3) and standard current transformer (8), the cover is established and is equipped with adapter sleeve (5) on high-voltage cable (1), the output of standard current transformer (8) passes through the electric wire and is connected with ammeter case (9), ammeter case (9) and electric cabinet (7) wireless transmission connect, current transformer group (2) have ampere meter (4) through the connection of electric lines, ampere meter (4) and adapter sleeve (5) all have cable clamp (6), two sets of through the connection of electric lines cable clamp (6) and electric cabinet (7) electric connection, just standard current transformer (8) are through electric wire and electric cabinet (7) electric connection.

2. The 10kV high-voltage combined transformer detection device according to claim 1, characterized in that: connecting wire (3) include connecting terminal (31) that set up with current transformer group (2) integrated into one piece, threaded connection has wiring end (32) on connecting terminal (31), wiring end (32) are connected with connecting wire (33), just the other end and ampere meter (4), standard current transformer (8) of connecting wire (33) are connected.

3. The 10kV high-voltage combined transformer detection device according to claim 1, characterized in that: establish in ammeter case (9) and standard current transformer (8), current transformer group (2) electric connection's current acquisition sensor group (10), current acquisition sensor group (10) electric output connection AD sensor (11), AD sensor (11) electric output connection current signal conditioning circuit module (12), current signal conditioning circuit module (12) electric output connection contrast module (13), contrast module (13) electric output connection MCU control module (14), MCU control module (14) electric output connection display module (15), MCU control module (14) two-way electric connection wireless transmission module (16), wireless transmission module (16) two-way electric connection electric cabinet (7).

4. The 10kV high-voltage combined transformer detection device according to claim 1, characterized in that: the connecting sleeve (5) is an insulating protective sleeve, and the connecting sleeve (4) is fixedly sleeved on the high-voltage cable (1) and is electrically connected with the high-voltage cable (14).

5. The 10kV high-voltage combined transformer detection device according to claim 4, wherein: the current transformer group (2) comprises a plurality of current transformers with the same group structures, the current transformers are fixedly assembled on the high-voltage cable (1), and the number of the connecting sleeves (5) is the same as that of the current transformers.

6. The 10kV high-voltage combined transformer detection device according to claim 5, wherein: the current transformers are electrically connected with the input end of the ammeter (4) through connecting wires (3) and are connected in parallel.

7. The 10kV high-voltage combined transformer detection device according to claim 6, wherein: the connecting sleeves (5) are electrically connected with the electric cabinet (7) through electric wires and are connected in parallel with the high-voltage cables (1).

8. The 10kV high-voltage combined transformer detection device according to claim 7, wherein: the ammeter (4), the current transformer, the high-voltage cable (1), the connecting sleeve (5) and the electric cabinet (7) form an electric loop.

9. The 10kV high-voltage combined transformer detection device according to claim 8, characterized in that: the standard mutual inductor (8), the ammeter (4) and the electric cabinet (7) form an electric loop.

10. The 10kV high-voltage combined transformer detection device according to claim 9, wherein: the electric meter box is characterized in that a storage battery is arranged in the electric meter box (9), and indicator lamps corresponding to the current transformer and the standard current transformer (8) are arranged on the electric meter box (9).

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