CN202049199U - Circuit for routine experiments without removing high-voltage leads - Google Patents

Abstract

The utility model discloses a circuit for performing routine tests without dismantling the high-voltage lead wire, including a CVT to be tested, the tgδ of the upper section C1 of the CVT and the capacitance test need to be reversely connected, the lead wire A at the upper end of C1 is grounded, and the lower end B is connected to the CVT. For the high-voltage core wire, the lower end C of the middle section C2 is connected to the high-voltage shielding wire, the δ of the CVT is grounded, and the XL is disassembled. The lower section C1 of the CVT adopts positive connection. The middle section of the CVT is positively connected, and the test power supply must bear the capacitive current of the two parallel sections. Utilizing the utility model, after using the high-voltage leads without removing them, the measurement results of the middle and lower sections of A, B, and C phases are basically the same as the test results of removing the leads, while the dielectric loss of the upper section has a certain increase compared with the standard range. However, there are changes in the capacitor tip, which is also within the qualified range, which is convenient and safe, saves manpower and material resources, greatly improves work efficiency, and shortens the power outage time.

Description

Circuits for routine tests without disconnecting the high-voltage leads

technical field

The utility model belongs to the technical field of routine tests for electrical equipment, in particular to a circuit for routine tests without removing high-voltage lead wires.

Background technique

Before and after the routine test of high-voltage electrical equipment, the high-voltage leads of the equipment under test must be disconnected. 500kV electrical equipment needs more time and manpower due to its large size, height, and high-voltage lead wires. Safety is also a concern. Moreover, the power outage of 500KV electrical equipment and electrical equipment for a long time will also pose a greater threat to the stability of the power grid. Therefore, when the power outage time is short and the personnel are limited, it is impossible to remove the high-voltage lead wire for routine testing. In order to improve work efficiency, save manpower and material resources, and reduce power outage time, it is necessary to study the method of routine testing of electrical equipment without removing high-voltage leads.

Utility model content

The purpose of the utility model is to avoid the disadvantages of the above-mentioned prior art, and provide a convenient, safe, manpower-saving, high-efficiency, cut-off time without removing the high-voltage lead wire for routine testing circuit.

A circuit for routine tests without removing the high-voltage lead wires, including the CVT to be tested. The tgδ of the upper section C1 of the CVT and the capacitance test must be reversed. The upper end lead A of C1 is grounded, and the lower end B is connected to the high-voltage core wire. The lower end C of section C2 is connected to the high-voltage shielding wire, the δ of the CVT is grounded, and the XL is disassembled.

The lower section C1 of the CVT adopts positive connection.

The middle section of the CVT is positively connected, and the test power supply must bear the capacitive current of the two parallel sections.

Utilizing the utility model, after using the high-voltage leads without removing them, the measurement results of the middle and lower sections of A, B, and C phases are basically the same as the test results of removing the leads, while the dielectric loss of the upper section has a certain increase compared with the standard range. However, there is a change in the capacitance tip, which is also within the acceptable range. Therefore, when measuring the dielectric loss test in the previous section, a method without shielding was proposed, and the dielectric loss and capacitance of the previous section were obtained by calculation. The adoption of the method of not dismantling the high-voltage leads has fully met the technical requirements of the "Regulations" and the equipment itself, which is convenient and safe, saves manpower and material resources, greatly improves work efficiency, and shortens the power outage time.

Description of drawings

Below in conjunction with accompanying drawing, the utility model will be further described:

Fig. 1 is a schematic circuit diagram of the utility model,

Fig. 2 is a schematic circuit diagram of the utility model.

Detailed ways

As shown in Fig. 1 and Fig. 2: the CVT upper section test in this connection mode, the tgδ and capacitance test of the CVT upper section C1 should be measured by the reverse connection method, as shown in Fig. 1, the upper end lead A of C1 is grounded, and the lower end B Connect the high-voltage core wire, the lower end C of the middle section C2 is connected to the high-voltage shielding wire, the δ of the CVT is grounded, and the XL is disassembled; the lower section of the CVT test can be connected directly or reversely, and the positive connection is generally used; the middle section of the CVT test The middle section can be directly connected as shown in Figure 2, and the test power supply must bear the capacitive current of the two parallel sections.

Utilizing the utility model, after using the high-voltage leads without removing them, the measurement results of the middle and lower sections of A, B, and C phases are basically the same as the test results of removing the leads, while the dielectric loss of the upper section has a certain increase compared with the standard range. However, there is a change in the capacitance tip, which is also within the acceptable range. Therefore, when measuring the dielectric loss test in the previous section, a method without shielding was proposed, and the dielectric loss and capacitance of the previous section were obtained by calculation. The adoption of the method of not dismantling the high-voltage leads has fully met the technical requirements of the "Regulations" and the equipment itself, which is convenient and safe, saves manpower and material resources, greatly improves work efficiency, and shortens the power outage time.

Claims (3)

1. do not tear the circuit that high-voltage connection carries out day to day tests open for one kind, comprise by test object CVT, it is characterized in that: described CVT goes up the tg δ and the electric capacity test of joint (C1) and wants reversal connection, (C1) upper end lead-in wire (A) ground connection, (B) connects the high pressure heart yearn in the lower end, middle joint (C2) lower end (C) connects the high-tension shielding line, the δ ground connection of CVT, and XL takes apart.

2. as claimed in claim 1ly do not tear the circuit that high-voltage connection carries out day to day tests open, it is characterized in that: CVT joint (C1) down adopts and just connects.

3. as claimed in claim 1ly do not tear the circuit that high-voltage connection carries out day to day tests open, it is characterized in that: joint adopts and just connects among the CVT, and experiment power supply will be born two joints capacitance current in parallel.

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