CN207939264U - A kind of air-cooled transformer general-purpose current supply circuit - Google Patents

Abstract

The utility model discloses a kind of air-cooled transformer general-purpose current supply circuits, including：First current supply circuit, the second current supply circuit and third current supply circuit；The third current supply circuit includes third power supply, PHR1 normally closed contacts, PHR2 normally closed contacts, the PHR1 normally closed contacts and PHR2 normally closed contacts series connection, it ensure that in the case of the first power supply and the equal switch failure of second source or dead electricity, the reliability of air-cooled control loop power supply, the economic loss brought due to power failure can be reduced, is contributed for the normal operation of air-cooled transformer.

Description

A kind of air-cooled transformer general-purpose current supply circuit

Technical field：

The utility model is related to transformer control technology field more particularly to a kind of air-cooled transformer general-purpose current supply circuits.

Background technology：

With the development of technology, in building the substation project using air-cooled transformer, the cooling dress of air-cooled transformer It sets and mostly uses the wind based on PLC (Programmable Logic Controller, programmable logic controller (PLC)) control system greatly Cold control loop.Entire cooling device access two independent AC powers can optional one be working power, another is spare Power supply, two power supplys can automatically switch.

However inventor has found in the process of implementing the utility model, the relay in air-cooled control loop is only with friendship Power supply power supply is flowed, to exist because having a power failure the destabilizing factor that circuit can not be made to work normally, even if providing stand-by power supply, But when also dead electricity occurs for stand-by power supply, air-cooled control loop will be caused to can not work normally, and influence cooling device and transformer Normal operation, or even cause failure.

Utility model content：

The purpose of this utility model is to provide a kind of air-cooled transformer general-purpose current supply circuits, to solve above-mentioned existing skill The problem of art.

The utility model is implemented by following technical solution：

The utility model embodiment provides a kind of air-cooled transformer general-purpose current supply circuit, including：

First current supply circuit, the second current supply circuit and third current supply circuit, wherein first current supply circuit includes first Power supply, QFA breakers, PHR1 relays, PHR1 normal opened contacts, KA1 relays, change-over switch SS 1. -2., KA1 normal opened contacts, KMB normally closed contacts, KMA relays, KMA normally open contacts, the PHR1 normal opened contacts are connected with the KA1 relays, and described One power supply, the change-over switch SS 1. -2., the KA1 normal opened contacts, the KMB normally closed contacts and the KMA relays string Connection；Second current supply circuit include second source, QFB breakers, PHR2 relays, PHR2 normal opened contacts, KA2 relays, Change-over switch SS 3. -4., KA2 normal opened contacts, KA1 normally closed contacts, KMA normally closed contacts, KMB relays and KMB normally open contacts, institute PHR2 normal opened contacts are stated to connect with the KA2 relays, the second source, the change-over switch SS 3. -4., the KA1 it is normal Contact, the KA2 normal opened contacts, the KMA normally closed contacts is closed to connect with the KMB relays；The third current supply circuit packet Include third power supply, PHR1 normally closed contacts, PHR2 normally closed contacts, the PHR1 normally closed contacts and PHR2 normally closed contacts series connection.

Further, first current supply circuit further include change-over switch SS 7. -8. with KA2 normally closed contacts, described first Power supply, the change-over switch SS 7. -8., the KA2 normally closed contacts, the KA1 normal opened contacts, the KMB normally closed contacts and institute State the series connection of KMA relays.

Further, second current supply circuit further include change-over switch SS 9. -10., the second source, the conversion Switch SS 9. -10., the KA2 normal opened contacts, the KMA normally closed contacts connect with the KMB relays.

Further, when first power supply is powered air-cooled control loop, the change-over switch SS 1. -2. and The change-over switch SS 3. -4. in an ON state.

Further, when first power supply is powered air-cooled control loop, QFA breakers make in closing position PHR1 relay excitations, PHR1 normal opened contacts are closed, with the concatenated KA1 relay excitations of the PHR1 normal opened contacts, KA1 Normal opened contact is closed, KA1 normally closed contacts disconnect, the KMB relays loss of excitation, KMB normally closed contacts are closed, first power supply By change-over switch SS 1. -2., the KA1 normal opened contacts that are closed and the KMB normally closed contacts of closure make the KMA relays Device excitation, to make KMA normally open contacts be closed.

Further, in second current supply circuit, the PHR2 relays, the KA2 relays loss of excitation, the PHR2 Normal opened contact, the KA2 normal opened contacts are off；In the third current supply circuit, at the PHR1 normally closed contacts In off-state.

Further, when first power supply is powered air-cooled control loop, QFB breakers make in closing position PHR2 relay excitations, PHR2 normal opened contacts are closed, normally opened with the concatenated KA2 relay excitations of the PHR2 normal opened contacts, KA2 Contact 14, which is connected, to be closed.

Further, when first power supply disappears, KA1 relays loss of excitation, KA1 normally closed contacts are closed, and described second Power supply by change-over switch SS 3. -4., the institute of the KA1 normally closed contacts that are closed, the KA2 normal opened contacts of closure, closure Stating KMA normally closed contacts makes the KMB relay excitations, to make KMB normally open contacts 4 be closed.

Further, in the third current supply circuit, the PHR2 normally closed contacts are off.

Further, when the second source disappears, the PHR2 normally closed contacts are closed, the PHR1 normally closed contacts and The PHR2 normally closed contacts are in closed state, and the third current supply circuit starts to power to the air-cooled control loop.

Further, when first power supply or the second source restore electricity, the PHR1 normally closed contacts or institute The disconnection of PHR2 normally closed contacts is stated, the third power supply stops powering to the air-cooled control loop, by described the of fault recovery One current supply circuit or second current supply circuit are powered for air-cooled control loop.

The advantages of the utility model：

Third power supply (uninterrupted electricity is increased in the air-cooled transformer general-purpose current supply circuit that the utility model embodiment provides Source, i.e. ups power) circuit, when the first power supply or second source work normally, third power supply does not come into operation, to reduce The common load of third power supply starts third power supply and is supplied to air-cooled control loop in the first power supply and second source all dead electricity Electricity, to ensure the safe operation of air-cooled transformer.It is returned by the power supply that is automatic, flexibly switching that the utility model embodiment provides Road ensure that the reliability of air-cooled control loop power supply, can reduce the economic loss brought due to power failure, be wind The normal operation of cold transformer contributes.

Description of the drawings：

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor Under, other drawings may also be obtained based on these drawings.

The air-cooled transformer general-purpose current supply circuit structural schematic diagram that Fig. 1 is provided by the utility model embodiment；

The air-cooled transformer general-purpose current supply circuit structural schematic diagram that Fig. 2 is provided by the utility model embodiment.

Specific implementation mode：

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts The every other embodiment obtained, shall fall within the protection scope of the present invention.

The term used in the utility model embodiment is the purpose only merely for description specific embodiment, and is not intended to Limit the utility model.The utility model embodiment and the "an" of singulative used in the attached claims, " described " and "the" are also intended to including most forms, unless context clearly shows that other meanings.

The technical solution of the utility model embodiment is described in detail below.

Fig. 1, Fig. 2 are the air-cooled transformer general-purpose current supply circuit structural schematic diagram that the utility model embodiment provides.Such as figure 1, shown in Fig. 2, the air-cooled transformer general-purpose current supply circuit that the utility model embodiment provides, including：

First current supply circuit 10, the second current supply circuit 20 and third current supply circuit 30.

First current supply circuit 10 include the first power supply, QFA breakers, PHR1 relays 1, PHR1 normal opened contacts 7, KA1 after Electric appliance 8, change-over switch SS 1. -2., KA1 normal opened contacts 10, KMB normally closed contacts 11, KMA relays 12, KMA normally open contacts 3, institute PHR1 normal opened contacts 7 are stated to connect with the KA1 relays 8, first power supply, the change-over switch SS 1. -2., the KA1 Normal opened contact 10, the KMB normally closed contacts 11 are connected with the KMA relays 12.

Second current supply circuit 20 include second source, QFB breakers, PHR2 relays 2, PHR2 normal opened contacts 17, KA2 after Electric appliance 18, change-over switch SS 3. -4., KA2 normal opened contacts 14, KA1 normally closed contacts, KMA normally closed contacts 15,16 and of KMB relays KMB normally open contacts 4, the PHR2 normal opened contacts 17 are connected with the KA2 relays 18, and the second source, the conversion are opened Close SS 3. -4., the KA1 normally closed contacts, the KA2 normal opened contacts 14, the KMA normally closed contacts 15 and the KMB relays 16 series connection.

Third current supply circuit 30 includes third power supply, PHR1 normally closed contacts 5, PHR2 normally closed contacts 6, and the PHR1 is normally closed to be connect Point and PHR2 normally closed contacts series connection.

Optionally, the first current supply circuit 10 further include change-over switch SS 7. -8. with KA2 normally closed contacts, first power supply, The change-over switch SS 7. -8., the KA2 normally closed contacts, the KA1 normal opened contacts 10, the KMB normally closed contacts 11 with it is described KMA relays 12 are connected.In the first Power Operating Process, if the change-over switch SS 1. -2. break down, institute can be utilized State change-over switch SS 7. -8. ensure that first power supply continues to power with the KA2 normally closed contacts.

Optionally, the second current supply circuit 20 further include change-over switch SS 9. -10., the second source, the change-over switch SS 9. -10., the KA2 normal opened contacts 14, the KMA normally closed contacts 15 connect with the KMB relays 16.In second source work During work, if the change-over switch SS 3. -4. break down, can utilize the change-over switch SS 9. -10. ensure described the Two power supplys continue to power.

Specifically, first power supply is common power supply, i.e., described first power supply first to the air-cooled control loop into Row power supply；The second source be stand-by power supply, when first power supply disappear (such as the first power failure, first electricity Source dead electricity etc.) when, the second source is automatically powered the air-cooled control loop；The third power supply is uninterrupted electricity Source, when first power supply and the second source all disappear, the third power supply automatically will to the air-cooled control loop It is powered；When first power supply or the second source restore electricity, the third power supply automatically exits from power supply.

Lower mask body introduces a kind of course of work of air-cooled transformer general-purpose current supply circuit of the utility model embodiment.

One, the first power supply of initial selected is powered air-cooled control loop

When the first power work, change-over switch SS 1.-contact 9 2. and SS 3.-contact 13 4. is closed, QFA open circuits Device makes 1 excitation of PHR1 relays, its normal opened contact 7 be closed in closing position, the line with 7 concatenated KA1 relays 8 of normal opened contact Enclose excitation, its normal opened contact 10 is closed.At this point, due to the disconnection of KA1 normally closed contacts, 16 loss of excitation of KMB relays, its normally closed contact 11 In closed state, the first power supply by change-over switch SS 1.-10-KMB of normal opened contact of contact 9-KA1 relays 2. after The normally closed contact 11 of electric appliance makes the coil magnetization of KMA relays 12, to make the normally open contact 3 of KMA relays 12 be closed, first Power supply is connected busbar and is powered to air-cooled control loop.

In the first power work, in the second current supply circuit 20, due to PHR2 relays 2,18 loss of excitation of KA2 relays, Its normal opened contact 17,14 is off, from being unable to make the coil magnetization of KMB relays 16, so second source is not Busbar is can turn on, air-cooled control loop cannot be also powered.In third current supply circuit 30, since PHR1 relays are encouraged Magnetic, normally closed contact 5 are disconnected, so third power supply not can turn on busbar, cannot be also powered to air-cooled control loop.

When the first power supply is powered, circuit breaker Q FB makes 2 excitation of PHR2 relays, its normal opened contact in closing position 17 are closed, and are connected with coil magnetization, its normal opened contact 14 of 17 concatenated KA2 relays 18 of normal opened contact.Due to KA1 at this time after 8 excitation of electric appliance, corresponding KA1 normally closed contacts disconnect, so KMB coils 16 are unable to excitation, so second source not can turn on Busbar cannot still be powered air-cooled control loop.

Two, the first power supply, second source automatically switch

When the first power supply disappears (such as the first power failure or dead electricity), 1 loss of excitation of PHR1 relays, its normal opened contact 7 It disconnects, excitation, the disconnection of its normal opened contact 10 is unable to 7 concatenated KA1 relays 8 of normal opened contact, so that KMA relays 12 Loss of excitation, its normal opened contact 3 disconnect, the power-off of the first current supply circuit 10.At the same time, due to 8 loss of excitation of KA1 relays, its is corresponding KA1 normally closed contacts are closed, in the second current supply circuit 20, second source by change-over switch SS 3.-4. 13-KA1 of contact relays The normally closed contact 15 of the normal opened contact 14--KMA relays of the normally closed contact of device-KA2 relays makes 16 coil of KMB relays encourage Magnetic, to make the normally open contact 4 of KMB relays 16 be closed, second source is connected busbar and is powered to air-cooled control loop.

When second source works, in third current supply circuit 30, due to PHR2 relay excitations, normally closed contact 6 is disconnected It opens, so third power supply not can turn on busbar, air-cooled control loop cannot be also powered.

After the first power failure is eliminated, 1 excitation of PHR1 relays, its normal opened contact 7 are closed, and are gone here and there with normal opened contact 7 The coil magnetization of the KA1 relays 8 of connection, its normal opened contact 10 are closed.At this point, due to 8 excitation of KA1 relays, its corresponding KA1 Normally closed contact disconnects, the power-off of the second current supply circuit 20.Since 16 loss of excitation of KMB relays, its normally closed contact 11 are in closed state, First power supply by change-over switch SS 1.-normally closed the connecing of normal opened contact 10-KMB relays of contact 9-KA1 relays 2. Point 11 makes the coil magnetization of KMA relays 12, and to make the normally open contact 3 of KMA relays 12 be closed, the first power supply connects busbar Air-cooled control loop is powered.

Three, third power supply is automatically powered air-cooled control loop

When the first power supply and second source disappear, PHR1 relays 1 and PHR2 relays 2 lose magnetism, normal opened contact 7, normal opened contact 17 automatically disconnect, respectively with normal opened contact 7,17 concatenated KA1 relays 8 of normal opened contact and KA2 relays 18 Loss of excitation, KA1 normal opened contacts, KA2 normal opened contacts disconnect, so that the coil of KMA relays 12, KMB relays 16 cannot encourage Magnetic, the first power supply and second source not can turn on busbar and be powered to air-cooled control loop.

At this point, since PHR1 relays 1 and PHR2 relays 2 lose magnetism, so PHR1 relays and PHR2 relays Normally closed contact 5,6 is closed, and third power supply automatically accesses air-cooled control loop by the normally closed contact 5,6 of PHR1, PHR2, to air-cooled Control loop is powered.

Four, third power supply, which automatically exits from, is powered air-cooled control loop

After the first power supply or second source Failure elimination, due to 2 excitation of PHR1 relays 1 or PHR2 relays, institute It will disconnect with the normally closed contact 5 or 6 of PHR1 relays or PHR2 relays, third power supply not can turn on busbar, to move back automatically Go out and air-cooled control loop is powered, air-cooled control loop is carried out by the first power supply or second source of fault recovery Power supply.

In conclusion the air-cooled transformer general-purpose current supply circuit that the utility model embodiment provides, in the first power supply or the When two power supplys work normally, third power supply does not access air-cooled control loop, i.e., is not powered to air-cooled control loop；First When power supply and second source all disappear, third power supply automatically accesses control loop, is powered to air-cooled control loop；When first When power supply or second source restore electricity, third power supply can automatically exit from control loop again, and it is (uninterrupted to reduce third power supply Power supply) common load, ensure that the reliability of air-cooled control loop power supply power supply, reduce since power supply failure is brought Economic loss, contribute for transformer normal operation.

The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model Protection domain within.

Claims (10)

1. a kind of air-cooled transformer general-purpose current supply circuit, which is characterized in that including：

First current supply circuit, the second current supply circuit and third current supply circuit, wherein

First current supply circuit include the first power supply, QFA breakers, PHR1 relays, PHR1 normal opened contacts, KA1 relays, Change-over switch SS 1. -2., KA1 normal opened contacts, KMB normally closed contacts, KMA relays, KMA normally open contacts, the PHR1 is normally opened to be connect Point is connected with the KA1 relays, first power supply, the change-over switch SS 1. -2., the KA1 normal opened contacts, described KMB normally closed contacts are connected with the KMA relays；

Second current supply circuit include second source, QFB breakers, PHR2 relays, PHR2 normal opened contacts, KA2 relays, Change-over switch SS 3. -4., KA1 normally closed contacts, KA2 normal opened contacts, KMA normally closed contacts, KMB relays and KMB normally open contacts, institute PHR2 normal opened contacts are stated to connect with the KA2 relays, the second source, the change-over switch SS 3. -4., the KA1 it is normal Contact, the KA2 normal opened contacts, the KMA normally closed contacts is closed to connect with the KMB relays；

The third current supply circuit includes third power supply, PHR1 normally closed contacts, PHR2 normally closed contacts, the PHR1 normally closed contacts and The PHR2 normally closed contacts series connection.

2. general-purpose current supply circuit according to claim 1, which is characterized in that first current supply circuit further includes that conversion is opened Close SS 7. -8. with KA2 normally closed contacts, first power supply, the change-over switch SS 7. -8., the KA2 normally closed contacts, described KA1 normal opened contacts, the KMB normally closed contacts are connected with the KMA relays.

3. current supply circuit according to claim 1, which is characterized in that second current supply circuit further includes change-over switch SS 10. 9. the second source, the change-over switch SS 9. -10., the KA2 normal opened contacts, the KMA normally closed contacts with it is described KMB relays are connected.

4. general-purpose current supply circuit according to claim 1, which is characterized in that when first power supply is to air-cooled control loop When being powered, the change-over switch SS 1. -2. with the change-over switch SS 3. -4. in an ON state.

5. general-purpose current supply circuit according to claim 4, which is characterized in that when first power supply is to air-cooled control loop When being powered, QFA breakers make PHR1 relay excitations, PHR1 normal opened contacts be closed in closing position, normal with the PHR1 Open the concatenated KA1 relay excitations of contact, KA1 normal opened contacts are closed, KA1 normally closed contacts disconnect, the KMB relays mistake Magnetic, KMB normally closed contacts be closed, first power supply by change-over switch SS 1. -2., be closed the KA1 normal opened contacts and close The KMB normally closed contacts closed make the KMA relay excitations, to make KMA normally open contacts be closed.

6. general-purpose current supply circuit according to claim 4, which is characterized in that in second current supply circuit, the PHR2 Relay, the KA2 relays loss of excitation, the PHR2 normal opened contacts, the KA2 normal opened contacts are off；Described In third current supply circuit, the PHR1 normally closed contacts are off.

7. according to claim 4-6 any one of them general-purpose current supply circuits, which is characterized in that when first power supply is to air-cooled When control loop is powered, QFB breakers make PHR2 relay excitations, PHR2 normal opened contacts be closed in closing position, with institute State the concatenated KA2 relay excitations of PHR2 normal opened contacts, KA2 normal opened contacts 14 are connected and are closed.

8. general-purpose current supply circuit according to claim 7, which is characterized in that when first power supply disappears, KA1 relays Device loss of excitation, KA1 normally closed contacts be closed, the second source by change-over switch SS 3. -4., be closed the KA1 normally closed contacts, The KMA normally closed contacts of the KA2 normal opened contacts, closure that are closed make the KMB relay excitations, to keep KMB normally opened Contact 4 is closed.

9. general-purpose current supply circuit according to claim 8, which is characterized in that described when the second source disappears PHR2 normally closed contacts are closed, and the PHR1 normally closed contacts and the PHR2 normally closed contacts are in closed state, and the third supplies Electrical circuit starts to power to the air-cooled control loop.

10. general-purpose current supply circuit according to claim 9, which is characterized in that when first power supply or second electricity When source restores electricity, the PHR1 normally closed contacts or the PHR2 normally closed contacts disconnect, and the third power supply stops to the wind Cold control loop power supply is supplied by first current supply circuit or second current supply circuit of fault recovery for air-cooled control loop Electricity.