CN107731625A - A kind of Buchholz relay - Google Patents

Abstract

An embodiment of the present invention provides a gas relay, including: a relay device, a hydraulic sensor, and a signal processor, wherein the interior of the relay device is filled with insulating oil; the hydraulic sensor is arranged inside the relay device, and when the liquid level of the insulating oil changes , the hydraulic pressure sensor generates a current change signal, and transmits the current change signal to the signal processor; the signal processor generates liquid level information of the insulating oil according to the current change signal. The embodiment of the present invention solves the problem that the operation and maintenance personnel cannot know the gas generated by the internal failure of the gas relay when the gas relay fails, so that the operation and maintenance personnel can deal with it in time to avoid greater losses caused by the failure.

Description

a gas relay

technical field

The invention relates to the field of transformers, in particular to a gas relay.

Background technique

The gas relay is installed on the connection pipe between the transformer box cover and the oil conservator. When a fault occurs inside the oil-immersed transformer, the arc will decompose the insulating material and generate a large amount of gas or cause an impulse of oil flow, which will trigger the relay to operate. Connect the specified control circuit, and send out a signal in time or automatically cut off the transformer.

The current light gas protection principle analyzes the total amount of gas inside the gas and sends an early warning signal. This detection method is unpredictable for the development of internal faults in the equipment. The signal time difference is used to determine the fault degree, and the accuracy and operability are poor. It can be seen that the operation and maintenance personnel cannot know the gas generated by the internal fault of the existing gas relay when a fault occurs.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is that when the gas relay fails, the operation and maintenance personnel cannot know the gas generated by the internal fault, so as to provide a gas relay.

For this reason, the embodiment of the present invention provides following technical scheme:

An embodiment of the present invention provides a gas relay, including: a relay device, a hydraulic sensor, and a signal processor, wherein the interior of the relay device is filled with insulating oil; the hydraulic sensor is arranged inside the relay device, and when the insulating oil When the liquid level of the oil changes, the hydraulic pressure sensor generates a current change signal and transmits the current change signal to the signal processor; the signal processor generates the liquid level of the insulating oil according to the current change signal altitude information.

Preferably, the hydraulic pressure sensor further includes: a moving contact, a static contact, and an annular magnet float, and the moving contact and the static contact form a set of contact groups in one-to-one correspondence, and multiple sets of the contact groups are arranged on The interior of the hydraulic sensor is arranged along the inner wall of the hydraulic sensor, and the ring-shaped magnet float is sleeved outside the hydraulic sensor. When the insulating oil level inside the Buchholz relay changes, the ring-shaped magnet float follows the insulating oil. The liquid level floats, absorbs the moving contact with the same height as the ring magnet float, makes the moving contact conduct with the static contacts of the same group, and generates the current change signal.

Preferably, the hydraulic sensor further includes: a lead wire, through which the hydraulic sensor transmits the current change signal to the signal processor.

Preferably, the hydraulic pressure sensor further includes: a resistor connected between the contact groups of the hydraulic pressure sensor.

Preferably, the gas relay further includes: an alarm device connected to the signal processor, and the signal processor judges whether the liquid level information is lower than a preset liquid level threshold, if the liquid level If the information is lower than the preset liquid level threshold, the signal processor sends an alarm signal to the alarm device to drive the alarm device to alarm.

Preferably, the Buchholz relay further includes: a display, the display receives the liquid level information transmitted by the signal processor, and displays the current liquid level of the insulating oil of the Buchholz relay according to the liquid level information; The alarm device generates alarm information according to the alarm signal and sends it to the display, and the display displays the alarm information.

Preferably, one side of the relay device is connected to the oil tank for filling insulating oil into the relay device; the other side is connected to the oil conservator, and when a fault occurs inside the transformer and gas is generated, the gas rises from the inside of the transformer , flowing through the gas relay to lower the oil level inside the relay device.

The technical scheme of the embodiment of the present invention has the following advantages:

The embodiment of the present invention fills the relay device with insulating oil and installs the hydraulic sensor inside the relay device. When a fault occurs inside the transformer, it is often accompanied by the generation of characteristic gas, which will cause the liquid level of the insulating oil inside the relay device to change. The hydraulic sensor generates a current change signal according to the liquid level of the insulating oil, and transmits the current change signal to the signal processor for processing, and the signal processor generates the height information of the insulating oil liquid level inside the relay device according to the current change signal. In this way, the staff can know in real time the situation of the faulty gas inside the gas relay, and provide decision-making data for the operation and maintenance personnel, so as to avoid the huge loss caused by the deterioration of the fault to the entire power grid.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

Fig. 1 is the structural diagram of the gas relay of the embodiment of the present invention;

Fig. 2 is the structural diagram of the hydraulic pressure sensor of gas relay of the embodiment of the present invention;

Fig. 3 is a structural diagram of the gas circuit of the gas relay according to the embodiment of the present invention.

detailed description

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically or electrically connected; it can be directly connected, or indirectly connected through an intermediary, or it can be the internal communication of two components, which can be wireless or wired connect. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as there is no conflict with each other.

An embodiment of the present invention provides a gas relay. FIG. 1 is a flow chart of the gas relay according to the embodiment of the present invention. As shown in FIG. 1 , the gas relay includes: a relay device 20 , a hydraulic sensor 21 and a signal processor 30 .

When the gas relay works normally, the inside of the relay device 20 is filled with insulating oil.

The hydraulic pressure sensor 21 is installed inside the relay device 20. When a fault occurs inside the transformer, it is often accompanied by the generation of characteristic gas. After the gas is generated, it rises from the inside of the transformer to the upper oil conservator. When the gas flows through the gas relay, the insulating oil inside the relay device will When the liquid level of the insulating oil changes, the hydraulic pressure sensor 21 generates a current change signal and transmits the current change signal to the signal processor 30 when the liquid level of the insulating oil changes.

The signal processor 30 generates liquid level information of insulating oil according to the current change signal. Since each height position of the hydraulic pressure sensor 21 corresponds to a corresponding current value, the signal processor can obtain the specific liquid level height of the insulating oil according to the current change signal, so that the operation and maintenance personnel can know the liquid level of the insulating oil in real time. In order to make corresponding measures according to the situation of fault development.

Through the above process, the hydraulic sensor converts the current change signal into a current change signal according to the change of the insulating oil level, and then sends the current change signal to the signal processor, and the signal processor can know the liquid level height of the insulating oil according to the current change signal , the operation and maintenance personnel can know the internal fault of the gas relay in real time, and the operation and maintenance personnel can make corresponding decisions according to the specific situation to avoid the loss of the entire power grid caused by the continued deterioration of the fault.

The gas relay also includes a heavy gas circuit. The heavy gas circuit is an existing technology. When a serious fault occurs inside the gas relay, a large amount of gas will be generated rapidly, and the internal pressure of the relay device will increase instantaneously, resulting in a large oil flow, thereby pushing the internal block. The board moves to connect the heavy gas circuit. Heavy gas actions will have a greater impact on both the equipment and the power grid.

Fig. 2 is the structural diagram of the hydraulic pressure sensor of gas relay of the embodiment of the present invention, as shown in Fig. 2, specifically, hydraulic pressure sensor 21 comprises: movable contact 24, static contact 23, annular magnet float 22, movable contact 24 and The static contacts 23 form a set of contact groups one by one. Multiple sets of contact groups are arranged inside the hydraulic sensor 21 and arranged along the inner wall of the hydraulic sensor 21 . The annular magnet float 22 is sheathed outside the hydraulic sensor 21 .

When the liquid level of the insulating oil inside the Buchholz relay 20 changes, the ring magnet float 22 floats with the liquid level of the insulating oil, and absorbs the moving contact 24 with the same height as the ring magnet float 22, so that the moving contact 24 and the static contact of the same group The head 23 is turned on to generate a current change signal.

Fig. 3 is a structural diagram of the gas circuit of the gas relay of the embodiment of the present invention. As shown in Fig. 3, preferably, the hydraulic pressure sensor 21 also includes: a lead wire 25, and the hydraulic pressure sensor 21 transmits the current change signal to the signal processing through the lead wire 25 device 30.

The heavy gas protection wiring is connected with the heavy gas circuit, which belongs to the prior art, and is used to prevent serious impact on equipment and even the power grid caused by connecting the heavy gas circuit when a major fault occurs inside the gas relay.

Preferably, the hydraulic pressure sensor 21 further includes: a resistor 26, which is connected between the contact groups of the hydraulic pressure sensor 21 for isolation of the contact groups, and makes different current values output when different contact groups are in contact.

Preferably, the gas relay further includes: an alarm device 31, which is connected to the signal processor 30, and the signal processor 30 judges whether the information of the liquid level of the insulating oil is lower than a preset liquid level threshold, and if the information of the liquid level of the insulating oil is lower than The liquid level threshold is preset, and the signal processor 30 sends an alarm signal to the alarm device 31 to drive the alarm device 31 to give an alarm. In order to warn the staff and prompt the staff to deal with it accordingly.

Preferably, the Buchholz relay also includes: a display 32, the display 32 receives the liquid level information transmitted by the signal processor 30, and displays the current level of insulating oil in the Buchholz relay according to the liquid level information; the alarm device 31 generates an alarm according to the alarm signal The alarm information is sent to the display 32, and the display 32 displays the alarm information.

Preferably, one side of the relay device can be connected with the oil tank, which is used to fill the relay device with insulating oil; It rises and flows through the gas relay, causing the oil level inside the relay device to drop.

Through the above process, it is solved that when the internal fault of the equipment develops rapidly, the fault degree can only be judged by manual experience through the time difference of light gas signaling, which improves the accuracy and operability. At the same time, when the fault develops to a certain extent, Call the police. The operation and maintenance personnel can judge the specific situation of the gas generated by the fault according to the liquid level of the insulating oil inside the gas relay, so that the operation and maintenance personnel can deal with it according to the specific situation, and avoid more serious losses caused by the continued deterioration of the fault.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (7)

1. A gas relay, characterized in that it comprises: a relay device, a hydraulic sensor, a signal processor, wherein, The interior of the relay device is filled with insulating oil; The hydraulic pressure sensor is arranged inside the relay device, and when the liquid level of the insulating oil changes, the hydraulic pressure sensor generates a current change signal and transmits the current change signal to the signal processor; The signal processor generates liquid level information of the insulating oil according to the current change signal. 2. The gas relay according to claim 1, wherein the hydraulic pressure sensor further comprises: a moving contact, a static contact, and an annular magnet float, and the moving contact and the static contact form a group in one-to-one correspondence Contact groups, multiple groups of the contact groups are arranged inside the hydraulic sensor, arranged along the inner wall of the hydraulic sensor, and the annular magnet float is sleeved outside the hydraulic sensor, When the liquid level of the insulating oil inside the Buchholz relay changes, the ring magnet float floats with the liquid level of the insulating oil, and absorbs the moving contact with the same height as the ring magnet float, so that the moving contact and the same group The static contact of the switch is turned on to generate the current change signal. 3. The gas relay according to claim 2, wherein the hydraulic pressure sensor further comprises: a lead wire, through which the hydraulic pressure sensor transmits the current change signal to the signal processor. 4. The gas relay according to claim 2, wherein the hydraulic pressure sensor further comprises: a resistor connected between the contact groups of the hydraulic pressure sensor. 5. The gas relay according to claim 1, characterized in that, the gas relay also comprises: an alarm device connected to the signal processor, and the signal processor judges whether the liquid level information is higher than a A preset liquid level threshold, if the liquid level information is lower than the preset liquid level threshold, the signal processor sends an alarm signal to the alarm device to drive the alarm device to alarm. 6. The gas relay according to claim 5, characterized in that, the gas relay further comprises: a display, the display receives the liquid level information transmitted by the signal processor, and displays according to the liquid level information The current liquid level of the insulating oil of the Buchholz relay; The alarm device generates alarm information according to the alarm signal and sends it to the display, and the display displays the alarm information. 7. The gas relay according to claim 1, characterized in that, one side of the relay device is connected to the oil tank for filling insulating oil into the relay device; the other side is connected to the oil conservator, when When a fault occurs inside the transformer and gas is generated, the gas rises from the inside of the transformer and flows through the gas relay, causing the oil level inside the relay device to drop.