CN109407034B - Primary and secondary synchronous wiring device of large-current transformer - Google Patents

Abstract

The invention relates to a primary and secondary synchronous wiring device of a large-current transformer, which belongs to the technical field of transformer detection and mainly solves the problems that a field 750 kV-level capacitor voltage transformer has higher precision traceability requirement, a boosting device is difficult to boost in field verification and is easy to be subjected to electromagnetic interference; the device comprises a standard device, a variable frequency electronic source, a transformer calibrator and an analog load device, and is characterized in that: the etalon comprises a standard voltage transformer and an inductive voltage divider, wherein: the standard voltage transformer consists of a primary winding of the standard voltage transformer, a boosting winding of the standard voltage transformer and a secondary proportional winding of the standard voltage transformer; the inductive voltage divider consists of an inductive voltage divider primary winding, an inductive voltage divider secondary power supply winding and an inductive voltage divider secondary proportional winding; the analog load device consists of a first standard load, a second standard load, a switching relay of a metering winding and an instrument winding, a first standard load working relay and a second standard load working relay.

Description

A kind of primary and secondary synchronous wiring device of large current transformer

Technical field

The invention belongs to the technical field of transformer detection, and specifically relates to a primary and secondary synchronous wiring device of a large current transformer.

Background technique

The calibration of high-current transformers used for electric energy measurement is also a daily calibration work for power transformers. The number of calibrations is also increasing year by year. In order to adapt to the requirements of standardized management of operations and greatly reduce the time of primary and secondary wiring, it not only improves the efficiency of calibration, but also It is a difficult issue in the current high-current transformer calibration work to ensure reliable high-current contact without the influence of thermal impedance caused by poor contact.

The current technical situation is that primary and secondary wiring are performed step by step, including automatic flow verification of transformers. Synchronous wiring has certain technical difficulties. The primary and secondary synchronous wiring methods and their reliable primary connection under high current conditions are leading technologies. The meaning of progress.

Contents of the invention

The invention mainly solves the reliability problem of the primary and secondary synchronous wiring of a large current transformer, improves the wiring efficiency at the same time, and provides a device for the primary and secondary synchronous wiring of a large current transformer.

The technical solutions adopted by the present invention to solve the above technical problems are:

A primary and secondary synchronous wiring device for a large current transformer, including a positioning device, a primary threading device and a secondary wiring device; its characteristics are: the positioning device includes a positioning baffle and a bottom plate, and the positioning baffle is arranged on the bottom plate At one end, the bottom plate is provided with rubber feet; the primary threading device includes a primary loop conductive post, a Morse cone, and a primary connecting cord, and the primary loop conductive post is fixed on the bottom plate through an insulating positioning sleeve. The Morse cone head is fixed on the front end of the directional push rod, the Morse cone head is fixed on the directional push rod through a cross-recessed pan-head screw, and an insulating sleeve is placed on the cross-recessed pan-head screw; The upper part of the primary circuit conductive column is provided with a tapered groove that matches the Morse cone, and a permanent magnet ring is provided in the tapered groove. One end of the primary connection cord is connected to the Morse cone. , the other end is connected to the pillar, and insulation measures are taken between the pillar and the primary connection cord; the secondary wiring device includes a secondary connector and a secondary tightening contact, and the secondary connector is fixed on the directional push On the rod, the secondary pressing contact is arranged at the front end of the secondary connector.

The secondary connector is made of insulating material;

The secondary connector is made of nylon;

The primary circuit conductive pillar is made of copper.

Compared with the prior art, the present invention has the following beneficial effects:

The use of Morse cone head solves the technical limitations of poor heating due to large current contact and the pressing force is achieved by the thread or motor thrust;

The secondary nylon connector and primary connection cord are fixed on the directional push rod, which solves and realizes the problem of primary and secondary synchronous wiring of low-voltage and high-current transformers.

Description of the drawings

Figure 1 is a schematic structural diagram of the present invention;

Figure 2 is a top view of the structure shown in Figure 1;

Figure 3 is a schematic diagram of the working state of the present invention;

Figure 4 is a top view of the structure shown in Figure 3;

Figure 5 is a schematic diagram of the connection between the Morse cone of the present invention and the conductive post of the primary circuit.

In the picture: 1—positioning baffle; 2—primary circuit conductive post; 3—Morse cone; 4—directional push rod; 5—bracket; 6—secondary connector; 7—base plate; 8—primary connection cord ; 9—Permanent magnet ring; 10—Tested high current transformer; 11—Insulating bushing; 12—Insulating positioning sleeve; 13—Rubber feet; 14—Pillar; 15—Cross recessed pan head screw; 16—Secondary jack Tight contact; 17—operating handle.

Detailed ways

As shown in Figures 1, 2, 3, and 4, a primary and secondary synchronous wiring device for a large current transformer includes a positioning device, a primary threading device, and a secondary wiring device; its characteristics are: the positioning device It includes a positioning baffle 1 and a base plate 7. The positioning baffle 1 is provided at one end of the base plate 7. The base plate 7 is provided with rubber feet 13; the primary threading device includes a primary circuit conductive post 2, a Morse cone 3, The primary connection cord 8 is connected, and the primary circuit conductive post 2 is fixed on the base plate 7 through an insulating positioning sleeve 12. As shown in Figure 5, the Morse cone 3 is fixed on the front end of the directional push rod 4 , the Morse cone head 3 is fixed on the directional push rod 4 through a cross-recessed pan-head screw 15, and an insulating sleeve 11 is placed on the cross-recessed pan-head screw 15; the upper part of the primary circuit conductive column 2 is provided There is a tapered groove matching the Morse cone 3, and a permanent magnet ring 9 is provided in the tapered groove. The primary connection cord 8 has one end connected to the Morse cone 3 and the other end to the pillar. 14 connection, insulation measures are taken between the pillar 14 and the primary connection cord 8; the secondary wiring device includes a secondary connector 6 and a secondary pressing contact 16, the secondary connector 6 is fixed on the directional On the push rod 4, the secondary pressing contact 16 is provided at the front end of the secondary connector 6.

The secondary connector 6 is made of insulating material;

The secondary connector 6 is made of nylon;

The primary circuit conductive pillar 2 is made of copper.

working principle:

When the tested high current transformer 10 is placed in the area defined by the positioning baffle 1 on the base plate 7, push the operating handle 17 and push the directional push rod 4 to the left to send the Morse cone head 3 into the cone of the primary circuit conductive column 2 In the hole, there is auxiliary magnetic guidance generated by the permanent magnet ring 9 and the cross-recessed pan head screw 15, so that the primary circuit is reliably connected;

Push the operating handle 17 and push the directional push rod 4 to the left. At the same time, the secondary pressing contact 16 on the secondary connector 6 fixed at the appropriate position of the push rod moves to the left together with the push rod and connects with the tested high current transformer. The secondary lead-out screws also achieve balanced contact and conduct the secondary circuit.

The effective area for carrying large currents is related to the pressure acting on the contact terminal. The Morse taper combined with its own locking force just meets this requirement. It is generated with the help of the permanent magnet ring 9 and the cross-recessed pan head screw 15. The magnetic force can enhance the locking force, thereby increasing the effective contact area between the Morse cone head 3 and the cone hole and enhancing the contact pressure between the cone head and the cone hole, making high-current contact more reliable and effective.

Claims (5)

1. A primary and secondary synchronous wiring device for a large current transformer, including a positioning device, a primary threading device and a secondary wiring device; characterized in that: the positioning device includes a positioning baffle (1) and a bottom plate (7), The positioning baffle (1) is provided at one end of the bottom plate (7), and the bottom plate (7) is provided with rubber feet (13); the primary threading device includes a primary circuit conductive post (2), a Morse cone ( 3). Primary connection cord (8), the primary circuit conductive post (2) is fixed on the base plate (7) through an insulating positioning sleeve (12), and the Morse cone (3) is fixed on the directional At the front end of the push rod (4), the Morse cone head (3) is fixed on the directional push rod (4) through a cross recessed pan head screw (15), and the cross recessed pan head screw (15) is covered with a Insulating sleeve (11); the upper part of the primary circuit conductive column (2) is provided with a tapered groove that matches the Morse cone (3), and a permanent magnet ring (9) is provided in the tapered groove. ), one end of the primary connection cord (8) is connected to the Morse cone (3), and the other end is connected to the pillar (14). Insulation is adopted between the pillar (14) and the primary connection cord (8). Measures: The secondary wiring device includes a secondary wiring device (6) and a secondary pressing contact (16). The secondary wiring device (6) is fixed on the directional push rod (4). The secondary wiring device (6) is fixed on the directional push rod (4). The pressing contact (16) is arranged at the front end of the secondary connector (6). When the Morse cone (3) is combined with the tapered groove on the primary circuit conductive post (2), the two The secondary tight contact (16) is in effective contact with the secondary lead-out screw of the high current transformer under test. 2. The primary and secondary synchronous wiring device of a large current transformer according to claim 1, characterized in that the secondary connector (6) is made of insulating material. 3. The primary and secondary synchronous wiring device of a large current transformer according to claim 1, characterized in that: the secondary wiring connector (6) is made of nylon. 4. The primary and secondary synchronous wiring device of a large current transformer according to claim 1, characterized in that: the primary circuit conductive post (2) is made of copper. 5. The primary and secondary synchronous wiring method of a large current transformer includes the primary and secondary synchronous wiring device of a large current transformer according to claim 1, which is characterized in that: first, the tested large current transformer (10) is fixed on On the bottom plate (7), the primary circuit conductive post (2) fixed on the bottom plate (7) is penetrated through the core hole of the high current transformer (10) under test, and then the directional pusher installed on the moving part is The Morse cone (3) on the rod (4) is pushed into the tapered groove matching the Morse cone (3) provided on the primary circuit conductive post (2). At this time, it is fixed to the The secondary pressing contact (16) on the secondary connector (6) at the appropriate position on the directional push rod (4) happens to be in effective contact with the secondary lead-out screw of the high-current transformer under test, and the high-current mutual inductance under test The primary loop and secondary loop of the device (10) are connected to the corresponding equipment respectively, and the test can be started.