CN220773171U

CN220773171U - Quick measuring device for insulation resistance of secondary winding of transformer

Info

Publication number: CN220773171U
Application number: CN202322560904.7U
Authority: CN
Inventors: 梁庆妮; 曹世权; 周海齐; 梁倩语
Original assignee: China Yangtze Power Co Ltd
Current assignee: China Yangtze Power Co Ltd
Priority date: 2023-09-20
Filing date: 2023-09-20
Publication date: 2024-04-12
Anticipated expiration: 2033-09-20

Abstract

The utility model discloses a rapid measuring device for insulation resistance of a secondary winding of a transformer, which comprises a secondary terminal insulation soft sheath, a test wire, a grounding change-over switch, a short-circuit point port, a grounding port and a box body. The secondary terminal insulation soft sheath is of a round hollow structure, the inside of the secondary terminal insulation soft sheath is connected with one end of a test wire through an adhesion thin soft copper sheet, the other end of the test wire is fixedly connected with a grounding change-over switch through a short-circuit point port, and the grounding change-over switch is connected with a grounding port through an internal copper bar. The short-circuit port and the grounding port adopt pure copper plug binding posts, and the grounding change-over switch adopts a single-pole switch. The device has solved current transformer, voltage transformer and has carried out electrical test in-process such as insulation resistance measurement, alternating current withstand voltage, frequently need carry out short circuit ground connection to each secondary terminal of transformer secondary winding, trade loaded down with trivial details test inefficiency scheduling problem of line, has simple structure, convenient operation, is suitable for characteristics such as mutual-inductor, the insulation of different specification models.

Description

Quick measuring device for insulation resistance of secondary winding of transformer

Technical Field

The utility model relates to the technical field of electrical equipment tests, in particular to a device for rapidly measuring insulation resistance of a secondary winding of a transformer.

Background

When current transformer, voltage transformer carry out electrical tests such as insulation resistance measurement test, alternating current withstand voltage test, frequently need carry out short circuit ground connection to each secondary terminal of transformer secondary winding, because the transformer secondary terminal adopts screw connection, when using ordinary test fastener centre gripping, the contact surface is insufficient, and the test fastener is easy not hard up, and because secondary terminal is arranged compactly, and test fastener clamping position space allowance is little, brings a lot of inconveniences for test wiring, reduces test efficiency.

Disclosure of Invention

Aiming at the defects existing in the prior art, the utility model provides a device for rapidly measuring the insulation resistance of a secondary winding of a transformer, which solves the problems that a test wire clamp is easy to loosen and the test wire clamp needs frequent short circuit and grounding to cause low measurement efficiency in the prior art.

According to the embodiment of the utility model, the quick measuring device for the insulation resistance of the secondary winding of the transformer comprises an insulation box body and a grounding port arranged on the insulation box body, wherein the grounding port is connected with a grounding point through a grounding wire, a short-circuit point port is connected in parallel on the grounding port, a grounding change-over switch is arranged on a connecting wire of the short-circuit point port, a test wire is connected on the short-circuit point port, and a movable end of the test wire is connected with a secondary terminal insulation soft sheath.

Preferably, the secondary terminal insulation soft sheath is of a round hollow structure, and a thin soft copper sheet for connecting the test wire is adhered to the inner wall of the secondary terminal insulation soft sheath.

Preferably, one end of the grounding change-over switch is fixedly connected with the short-circuit point port through a short copper bar, the other end of the grounding change-over switch is connected with the grounding port through a long copper bar, and the grounding change-over switch is of a single-pole switch structure.

Preferably, the short copper bars and the long copper bars are fixed at the bottom of the panel of the insulation box body.

Preferably, the short-circuit port and the grounding port are both hexagonal connection studs.

Compared with the prior art, the utility model has the following beneficial effects:

1. the secondary terminal insulating soft sheath is made of flexible materials, is of a round hollow structure, can be sleeved on secondary terminal screws of transformers with different specifications and types, is firm and stable in sleeving, is not easy to loosen, is convenient to detach, and cannot damage the secondary terminal screws of the transformers.

2. According to the utility model, the grounding of the secondary terminal of the transformer is controlled by arranging the single-pole switch, according to the actual electrical test requirement, the non-tested secondary terminal is grounded, the tested secondary terminal is short-circuited and not grounded, frequent line replacement is not needed, the test time is shortened, and the test efficiency is improved.

Drawings

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

Fig. 2 is a side view of the present utility model.

Fig. 3 is a top view of the present utility model.

Fig. 4 is an effect diagram of the present utility model.

Fig. 5 is a partial enlarged view of the secondary terminal insulation soft sheath according to the present utility model.

In the figure: 1. a secondary terminal insulation soft sheath; 2. a test line; 3. a short-circuit point port; 4. a ground transfer switch; 5. a ground port; 6. an insulating box; 7. a tested transformer; 8. a grounding point.

Detailed Description

The technical scheme of the utility model is further described below with reference to the accompanying drawings and examples.

As shown in fig. 1-5. The utility model provides a rapid measurement device for insulation resistance of a secondary winding of a transformer, which comprises an insulation box body 6 and a grounding port 5 arranged on the insulation box body 6, wherein the grounding port 5 is connected with a grounding point 8 through a grounding wire, a short-circuit port 3 is connected in parallel on the grounding port 5, a grounding change-over switch is arranged on a connecting wire of the short-circuit port 3, a test wire 2 is connected on the short-circuit port 3, and a movable end of the test wire 2 is connected with a secondary terminal insulation soft sheath 1.

Through setting up four short-circuit point ports 3, can short circuit all secondary terminals of the mutual-inductor 7 that is tested to select different secondary windings to carry out the ground connection according to experimental selection demand, satisfy electrical test wiring requirements such as insulation resistance measurement, be applicable to the mutual-inductor of different specification models, it is reliable to insulate.

As shown in fig. 5. The secondary terminal insulation soft sheath 1 is of a round hollow structure, and a thin soft copper sheet for connecting the test wire 2 is adhered to the inner wall of the secondary terminal insulation soft sheath.

As shown in fig. 1. One end of the grounding change-over switch 4 is fixedly connected with the short-circuit point port 3 through a short copper bar, the other end of the grounding change-over switch is connected with the grounding port 5 through a long copper bar, and the grounding change-over switch 4 is of a single-pole switch structure.

As a preferred embodiment of the present utility model. The short copper bars and the long copper bars are fixed at the bottom of the panel of the insulation box 6.

As a preferred embodiment of the present utility model. And the short-circuit point port 3 and the grounding port 5 are both hexagonal connection posts.

In the implementation of this embodiment, first, according to the number of secondary windings of the tested transformer 7, the secondary terminal insulation soft jackets 1 are sleeved on all secondary terminals of the tested transformer 7 one by one, when the test of the first secondary windings 1S1 and 1S2 of the tested transformer 7 is performed, the first button K1 of the grounding switch 4 is driven to the open position, the second, third and fourth buttons K2, K3 and K4 of the grounding switch 4 are driven to the closed position, and the grounding port is connected with the grounding point 8 by using the grounding wire. And then the first binding post X1 of the short-circuit point port is connected to an insulating megohmmeter by a test wire, so that insulation resistance measurement or alternating current withstand voltage test of the secondary windings 1S1 and 1S2 can be performed. Similarly, when the second secondary windings 2S1 and 2S2 of the transformer 7 are tested, the second button K2 of the earthing switch 4 is turned to the open position, the first, third and fourth buttons K1, K3 and K4 of the earthing switch 4 are turned to the closed position, and the earthing port is connected to the earthing point 8 by the earthing wire. And then the second binding post X2 of the short-circuit point port is connected to an insulating megameter by a test wire, so that insulation resistance measurement or alternating current withstand voltage test of the secondary windings 2S1 and 2S2 can be carried out, and other secondary winding test methods of the tested transformer 7 are the same.

Claims

1. A device for rapidly measuring insulation resistance of a secondary winding of a transformer is characterized in that: including insulating box (6) and ground connection port (5) of setting on insulating box (6), ground connection port (5) are connected with ground point (8) through the earth connection, connect in parallel on ground connection port (5) have short circuit point port (3), and be provided with ground change over switch on the connecting wire of short circuit point port (3), connect test line (2) on short circuit point port (3), the expansion end of test line (2) is connected with insulating soft sheath (1) of secondary terminal.

2. The device for rapidly measuring insulation resistance of secondary winding of transformer as claimed in claim 1, wherein: the secondary terminal insulation soft sheath (1) is of a round hollow structure, and a thin soft copper sheet used for connecting the test wire (2) is adhered to the inner wall of the secondary terminal insulation soft sheath.

3. The device for rapidly measuring insulation resistance of secondary winding of transformer as claimed in claim 1, wherein: one end of the grounding change-over switch (4) is fixedly connected with the short-circuit port (3) through a short copper bar, the other end of the grounding change-over switch is connected with the grounding port (5) through a long copper bar, and the grounding change-over switch (4) is of a single-pole switch structure.

4. A device for rapidly measuring insulation resistance of a secondary winding of a transformer as claimed in claim 3, wherein: the short copper bars and the long copper bars are fixed at the bottom of the panel of the insulation box body (6).

5. The device for rapidly measuring insulation resistance of secondary winding of transformer as claimed in claim 1, wherein: and the short-circuit point port (3) and the grounding port (5) are both hexagonal connection columns.