CN103308793A - Testing device for heating direct-current cable - Google Patents

Abstract

The utility model relates to a test device for direct current cable heating, relating to a test device for cables. The conventional experimental device - the cable heating transformer with penetration type, can only test the AC cable. The present invention is characterized in that it includes a transformer, an AC cable, a bridge rectifier circuit, and a filter circuit, the transformer includes an iron core and a primary coil, the AC cable is used as a secondary coil, and the two ends of the AC cable are connected to the bridge rectifier circuit The input terminal of the bridge rectifier circuit is connected to the filter circuit and the DC cable under test. The high-voltage and low-current alternating current is converted into low-voltage and high-current alternating current through a transformer, and then passes through a bridge rectifier circuit and a filter circuit to become a high-current direct current, which flows into the tested DC cable and generates heat in the conductor to solve the problem of the DC cable. Heating problem, to achieve the purpose of cable heating aging test, simple structure, easy to operate.

Description

A test device for DC cable heating

technical field

The invention relates to a test device for cables. the

Background technique

In the existing high-voltage cable heating test, a high-current device capable of generating thousands of amperes is required. Both at home and abroad, a through-type cable heating transformer is used to conduct a high-current heating test on high-voltage cables. The tested cable must pass through the hole of the transformer core, and the tested cable must become the secondary coil of the transformer. After the pass-through cable heating transformer is fed with current, due to the electromagnetic effect of the secondary coil, the tested cable itself generates heat to achieve the purpose of the cable heating aging test. the

The conventional experimental device—the through-type cable heating transformer can only be tested on AC cables. On this basis, it is necessary to develop a heating test device for DC cables. the

Contents of the invention

The technical problem to be solved and the technical task proposed by the present invention are to perfect and improve the existing technical solutions, and to provide a test device for DC cable heating to solve the purpose of the DC cable heating test. For this reason, the present invention takes the following technical solutions. the

A test device for heating a DC cable, characterized in that it includes a transformer, an AC cable, a bridge rectifier circuit, and a filter circuit, the transformer includes an iron core and a primary coil, and the AC cable is used as a secondary coil, The two ends of the AC cable are connected to the input end of the bridge rectifier circuit, and the output end of the bridge rectifier circuit is connected to the filter circuit and the DC cable under test. The high-voltage and low-current alternating current is transformed into low-voltage and high-current alternating current through a transformer, and then passes through a bridge rectifier circuit and a filter circuit to become a high-current direct current, which flows into the tested DC cable and generates heat in the conductor to solve the problem of the DC cable. Heating problem, to achieve the purpose of cable heating aging test. The structure is simple and the operation is convenient. the

As a further improvement and supplement to the above technical solutions, the present invention also includes the following additional technical features. the

The filter circuit includes a first capacitor and a second capacitor respectively connected to the output end of the bridge rectifier circuit, the first capacitor is connected to the second capacitor, and the connection between the first capacitor and the second capacitor is grounded. the

The iron core is provided with a hole, and the AC cable is connected with the bridge rectifier circuit after passing through the hole. After passing through the hole, the AC cable is connected with the bridge rectifier circuit to improve the reliability of use. the

The bridge rectifier circuit includes four field effect transistors controlled by a PWM controller. the

Beneficial effects: the high-voltage and small-current alternating current is converted into low-voltage and high-current alternating current through the transformer, and then passes through the bridge rectifier circuit and filter circuit to become high-current direct current, flows into the tested DC cable, and generates heat in the conductor. Solve the problem of DC cable heating and achieve the purpose of cable heating aging test. The structure is simple and the operation is convenient. the

Description of drawings

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

In the figure: 1-AC cable; 2-bridge rectifier circuit; 3-first capacitor, second capacitor; 4-tested DC cable; 5-transformer. the

Detailed ways

The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings. the

The present invention includes a transformer 5, an AC cable 1, a bridge rectifier circuit 2, and a filter circuit. The transformer 5 includes an iron core and a primary coil, the AC cable 1 is used as a secondary coil, and the two ends of the AC cable 1 are connected to the input of the bridge rectifier circuit 2. terminal, the output terminal of the bridge rectifier circuit 2 is connected to the filter circuit and the DC cable 4 under test. The filter circuit includes a first capacitor 3 and a second capacitor 3 respectively connected to the output end of the bridge rectifier circuit 2 , the first capacitor 3 is connected to the second capacitor 3 , and the connection between the first capacitor 3 and the second capacitor 3 is grounded. The iron core is provided with a hole, and the AC cable 1 is connected with the bridge rectifier circuit 2 after passing through the hole. The bridge rectifier circuit 2 includes four FETs controlled by a PWM controller. the

The alternating current of high voltage and small current is converted into alternating current of low voltage and high current through transformer 5, and then passes through bridge rectifier circuit 2 and filter circuit to become direct current of high current, flows into the tested DC cable 4, and generates heat in the conductor. Troubleshoot DC cable heating issues. the

A kind of test device for direct current cable heating shown in above Fig. 1 is the concrete embodiment of the present invention, has reflected the outstanding substantive characteristic and remarkable progress of the present invention, can according to actual use needs, in the enlightenment of the present invention Under the circumstances, the equivalent modification of its shape, structure and other aspects are all within the scope of protection of this scheme. the

Claims (4)

1. A test device for DC cable heating, characterized in that it includes a transformer (5), an AC cable (1), a bridge rectifier circuit (2), and a filter circuit, and the transformer (5) includes an iron core 1. The primary coil, the AC cable (1) is used as the secondary coil, the two ends of the AC cable (1) are connected to the input end of the bridge rectifier circuit (2), and the output end of the bridge rectifier circuit (2) is connected to the filter circuit and the DC cable under test (4). 2. A test device for DC cable heating according to claim 1, characterized in that: the filter circuit includes a first capacitor (3) respectively connected to the output end of the bridge rectifier circuit (2), The second capacitor (3), the first capacitor (3) is connected to the second capacitor (3), and the connection between the first capacitor (3) and the second capacitor (3) is grounded. 3. A test device for DC cable heating according to claim 1, characterized in that: the iron core is provided with a hole, and the AC cable (1) passes through the hole and connects with the bridge rectifier circuit ( 2) connected. 4. A test device for DC cable heating according to claim 1, characterized in that: said bridge rectifier circuit (2) includes four field effect transistors controlled by a PWM controller.

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