CN217563306U

CN217563306U - Overcurrent protection device of electromagnetic voltage transformer

Info

Publication number: CN217563306U
Application number: CN202221577482.3U
Authority: CN
Inventors: 石志泉; 张诚才; 周红刚; 王文武; 刘洪佳; 宿鹏
Original assignee: SHANDONG TAIKAI TRANSFORMER CO Ltd
Current assignee: SHANDONG TAIKAI TRANSFORMER CO Ltd
Priority date: 2022-06-22
Filing date: 2022-06-22
Publication date: 2022-10-11
Anticipated expiration: 2032-06-22

Abstract

The utility model relates to an electromagnetic type voltage transformer's overcurrent protection device belongs to electrical equipment technical field, including the terminal case, be provided with first air switch in the terminal case, the terminal row, relay protection shutting module, second air switch and harmonic elimination module, the utility model discloses an add in electromagnetic type voltage transformer's secondary circuit and establish first air switch and second air switch for electromagnetic type voltage transformer's secondary circuit can automatic disconnection when breaking down, prevents that fault current from burning out the electrical equipment who links to each other with electromagnetic type voltage transformer secondary side winding, prevents mistake shutting and warning through the relay protection shutting module of establishing, prevents bigger electric wire netting accident, establishes harmonic elimination module through adding, in order to eliminate electromagnetic type voltage transformer's secondary circuit because of the overcurrent that ferromagnetic resonance produced.

Description

Overcurrent protection device of electromagnetic voltage transformer

Technical Field

The utility model belongs to the technical field of electrical equipment, concretely relates to electromagnetic type voltage transformer's overcurrent protection device.

Background

As important power equipment for voltage monitoring and protective sampling, a voltage transformer is generally arranged in incoming and outgoing lines and a bus circuit of a power station switching station, and a GAS INSULATED fully-closed combined electrical appliance is also often provided with a GIS (GAS INSULATED SWITCHGEAR) electromagnetic voltage transformer, and a secondary side of the GIS electromagnetic voltage transformer is generally directly connected to a junction control cabinet of the GIS equipment, and a corresponding short-circuit prevention device is absent, so that a secondary circuit of the electromagnetic voltage transformer often has a short-circuit phenomenon due to wrong wiring or lead insulation aging, a power grid accident is caused, and the personal safety of an operator is damaged, which is the prior art.

In view of the above, the present invention provides an overcurrent protection device for an electromagnetic voltage transformer; it is very necessary to solve the above-mentioned defects existing in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a design electromagnetic type voltage transformer's overcurrent protection device to there is the defect that GIS electromagnetic type voltage transformer secondary circuit lacks the short-circuit prevention device among the prior art to solve the problem that exists among the prior art.

In order to achieve the above purpose, the utility model provides the following technical scheme:

an overcurrent protection device of an electromagnetic voltage transformer comprises a terminal box, wherein a first air switch, a terminal bar, a relay protection locking module, a second air switch and a harmonic elimination module are arranged in the terminal box; a secondary side second winding of the electromagnetic voltage transformer is connected with a relay protection locking module through an auxiliary contact; and a secondary side third winding of the electromagnetic voltage transformer is connected with the resonance elimination module through a second air switch.

Preferably, the harmonic elimination module comprises an overcurrent suppressor, a first terminal, a second terminal and an overvoltage suppressor, wherein the first terminal is arranged at one end of the overcurrent suppressor, and the overcurrent suppressor is connected to the second air switch through the first terminal; the second terminal is arranged at the other end of the over-current suppressor, and the over-current suppressor is grounded through the second terminal; the overvoltage suppressors are arranged in parallel on the overcurrent suppressors.

Preferably, the overvoltage suppressor is an overvoltage suppressor of model YZG2 series.

Preferably, the overcurrent suppressor comprises one or at least two positive temperature coefficient thermistors connected in series.

Preferably, the first air switch and the second air switch are air switches with models S201-C10.

Preferably, the auxiliary contact is an auxiliary contact with the model number of S2C-S/H6R.

Preferably, the relay protection locking module comprises a locking relay and an alarm, and the locking relay is a locking relay with the model number of LB-7.

The beneficial effects of the utility model reside in that, add in electromagnetic type voltage transformer's secondary circuit and establish first air switch and second air switch for electromagnetic type voltage transformer's secondary circuit can automatic disconnection when breaking down, prevents that fault current from burning the electrical equipment who links to each other with electromagnetic type voltage transformer secondary side winding, in addition, can also prevent mistake blocking and warning through adding the relay protection shutting module of establishing, prevents that bigger electric wire netting accident from appearing.

Furthermore, the utility model relates to a principle is reliable, and simple structure has very extensive application prospect.

Therefore, compared with the prior art, the utility model has the outstanding substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.

Drawings

Fig. 1 is a relationship diagram of an overcurrent protection device.

Fig. 2 is a schematic structural diagram of the overcurrent protection device.

Fig. 3 is a schematic structural diagram of the harmonic elimination module.

The air switch comprises a terminal box 1, a first air switch 2, a terminal row 3, a relay protection locking module 4, a locking relay 41, an alarm 42, a second air switch 5, a harmonic elimination module 6, an overcurrent suppressor 61, a positive temperature coefficient thermistor 611, a first terminal 62, a second terminal 63, an overvoltage suppressor 64, an element mounting post 7 and an auxiliary contact 8.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings by way of specific examples, which are illustrative of the present invention and are not limited to the following embodiments.

As shown in fig. 1 and fig. 2, the present invention provides an overcurrent protection device for an electromagnetic voltage transformer, which includes a terminal box 1, wherein a first air switch 2, a terminal row 3, a relay protection locking module 4, a second air switch 5 and a harmonic elimination module 6 are disposed in the terminal box 1; an element mounting column 7 is further arranged in the terminal box 1, and the first air switch 2, the terminal row 3, the relay protection locking module 4, the second air switch 5 and the resonance elimination module 6 can be detachably mounted on the element mounting column 7, so that electric elements in the terminal box 1 are arranged in order and wiring is facilitated.

A secondary side first winding of the electromagnetic voltage transformer is connected with a first end of a terminal row 3 through a first air switch 2, and a second end of the terminal row 3 is connected to a junction control cabinet outside a terminal box; a secondary side second winding of the electromagnetic voltage transformer is connected with the relay protection locking module 4 through an auxiliary contact 8; a secondary side third winding of the electromagnetic voltage transformer is connected with a harmonic elimination module 6 through a second air switch 5; the relay protection locking module 4 comprises a locking relay 41 and an alarm 42, the locking relay 41 adopts a locking relay with the model of LB-7, the first air switch 2 and the second air switch 5 both adopt air switches with the models of S201-C10, and the auxiliary contact 8 adopts an auxiliary contact with the model of S2C-S/H6R.

As shown in fig. 3, the harmonic elimination module 6 includes an overcurrent suppressor 61, a first terminal 62, a second terminal 63, and an overvoltage suppressor 64, where the first terminal 62 is disposed at one end of the overcurrent suppressor 61, and the overcurrent suppressor 61 is connected to the second air switch 5 through the first terminal 62, that is, the overcurrent suppressor 61 is connected to the electromagnetic voltage transformer through the second air switch 5, and is used for suppressing overcurrent of the electromagnetic voltage transformer; the second terminal 63 is arranged at the other end of the overcurrent suppressor 61, and the overcurrent suppressor 61 is grounded through the second terminal 63; the overvoltage suppressor 64 is mounted in parallel to the overcurrent suppressor 61 for preventing the overcurrent suppressor from being broken down. The overcurrent suppressor 61 includes one or at least two series positive temperature coefficient thermistors 611, and the overvoltage suppressor 64 is an overvoltage suppressor of YZG2 series.

The utility model discloses an add in electromagnetic type voltage transformer's secondary circuit and establish first air switch 2 and second air switch 5, make electromagnetic type voltage transformer's secondary circuit can automatic disconnection when breaking down, prevent that fault current from burning out the electrical equipment who links to each other with electromagnetic type voltage transformer secondary side winding, in addition, still carry out mistake blocking and warning by preventing through adding the relay protection shutting module 4 of establishing, specifically, in case electromagnetic type voltage transformer's secondary circuit disconnection, this relay protection shutting module 4 starts shutting relay 41 immediately and carries out relay protection shutting, send alarm signal by alarm 42 simultaneously, prevent that electromagnetic type voltage transformer's secondary circuit from breaking and arousing relay protection malfunction, prevent promptly to appear bigger electric wire netting accident, the utility model discloses still through adding establish harmonic elimination module 6, with the overcurrent that eliminates electromagnetic type voltage transformer's secondary circuit because of ferromagnetic resonance production.

The above disclosure is only for the preferred embodiments of the present invention, but the present invention is not limited thereto, and any person skilled in the art can think of the inventive changes, and several improvements and decorations made without departing from the principle of the present invention should fall within the protection scope of the present invention.

Claims

1. An overcurrent protection device of an electromagnetic voltage transformer is characterized by comprising a terminal box, wherein a first air switch, a terminal bar, a relay protection locking module, a second air switch and a harmonic elimination module are arranged in the terminal box; a secondary side second winding of the electromagnetic voltage transformer is connected with a relay protection locking module through an auxiliary contact; and a secondary side third winding of the electromagnetic voltage transformer is connected with the resonance elimination module through a second air switch.

2. The overcurrent protection device of an electromagnetic voltage transformer as recited in claim 1, wherein the harmonic elimination module comprises an overcurrent suppressor, a first terminal, a second terminal, and an overvoltage suppressor, the first terminal is disposed at one end of the overcurrent suppressor, and the overcurrent suppressor is connected to the second air switch via the first terminal; the second terminal is arranged at the other end of the over-current suppressor, and the over-current suppressor is grounded through the second terminal; the overvoltage suppressors are arranged in parallel on the overcurrent suppressors.

3. The over-current protection device of an electromagnetic voltage transformer according to claim 2, wherein the overvoltage suppressor is an overvoltage suppressor of model YZG2 series.

4. The overcurrent protection apparatus for an electromagnetic voltage transformer as recited in claim 2, wherein said overcurrent suppressor comprises one or at least two series-connected positive temperature coefficient thermistors.

5. The overcurrent protection device of the electromagnetic voltage transformer as recited in claim 1, wherein the first air switch and the second air switch are both air switches of type S201-C10.

6. The overcurrent protection device for the electromagnetic voltage transformer as recited in claim 1, wherein the auxiliary contacts are auxiliary contacts of type S2C-S/H6R.

7. The overcurrent protection device of the electromagnetic voltage transformer as recited in claim 1, wherein the relay protection blocking module comprises a blocking relay and an alarm, and the blocking relay is a blocking relay with a model number of LB-7.