CN219498938U - Transformer protection device - Google Patents
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- CN219498938U CN219498938U CN202320267545.3U CN202320267545U CN219498938U CN 219498938 U CN219498938 U CN 219498938U CN 202320267545 U CN202320267545 U CN 202320267545U CN 219498938 U CN219498938 U CN 219498938U
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Abstract
The utility model discloses a transformer protection device, which is configured to comprise a first switch, a second switch and an output relay, wherein the first switch is used for controlling the on-off of the second switch, and a normally open contact of the output relay is configured to be used for connecting the output of a transformer with a load, and the output of the transformer is connected with the load when the normally open contact is connected; the on-off of the normally open contact of the output relay is controlled by the second switch; the first switch is configured to include a temperature controlled switch. The protection device is provided with the temperature control switch, so that the detection of the environmental temperature (the working environment of the transformer, the environmental temperature of the electric equipment and the environmental temperature of the power transmission line) is realized, and the operation is disconnected when the temperature reaches the operation condition of the temperature control switch, so that the output relay is disconnected, the power supply of an access load is disconnected, and the burning probability of the transformer is reduced to a certain extent.
Description
Technical Field
The utility model relates to a transformer protection device.
Background
A transformer is a device for changing an ac voltage using the principle of electromagnetic induction, and is mainly composed of a primary coil, a secondary coil, and a core (magnetic core). In electrical equipment and wireless circuits, it is often used as a step-up voltage, a matching impedance, a safety isolation, etc.
In the using process of the transformer, the overload condition often causes great economic loss because of burning out the transformer, and the utility model provides a protection device on the basis.
Disclosure of Invention
The utility model aims to provide a transformer protection device which can monitor the ambient temperature and cut off the power supply connected to a load when the load is over-high, over-current, over-voltage and the like cause the over-temperature, so that the probability of burning the transformer is reduced to a certain extent.
The utility model provides a transformer protection device which is configured to comprise a first switch, a second switch and an output relay, wherein the first switch is used for controlling the on-off of the second switch, and a normally open contact of the output relay is configured to be connected with the output of a transformer and a load, so that the output of the transformer is connected with the load when the normally open contact is connected with the output of the transformer; the on-off of the normally open contact of the output relay is controlled by the second switch;
the first switch is configured to include a temperature controlled switch for sensing a temperature of an operating environment of the transformer.
Optionally, the second switch is configured as a first relay KA2; the power supply is connected into the coil of the first relay KA2 through the temperature control switch FR, and is connected into the coil of the output relay through the normally closed contact of the first relay KA 2.
Optionally, the first switch is further configured to include a time control switch KT, the second switch is configured to be a first relay KA2 and a second relay KA1, a power source is connected to the coil of the first relay KA2 through the temperature control switch FR, is connected to the coil of the second relay KA1 through the time control switch KT, and is connected to the output relay coil through the normally closed contact of the first relay KA2 and the normally open contact of the second relay KA 1.
Optionally, the first switch is further configured to include a time-controlled switch KT, the second switch is configured to include a first relay KA2 and a second relay KA1, and the output relays are configured in groups; the power supply is connected into the coil of the first relay KA2 through the temperature control switch FR, is connected into the coil of the second relay KA1 through the time control switch KT, is connected into the coil of the partial output relay through the normally closed contact of the first relay KA2, and is connected into the coil of the other partial output relay through the normally closed contact of the first relay KA2 and the normally open contact of the second relay KA 1.
Optionally, the first switch is configured to include a temperature control switch FR and a time control switch KT, the second switch is configured to include a first relay KA2, a second relay KA1 and a third relay KA, and the output relays are configured in groups; the power supply is divided into two paths through a main switch SA, one path is connected into a coil of a first relay KA2 through a temperature control switch FR, is connected into a coil of a second relay KA1 through a time control switch KT, is connected into a coil of a part of an output relay through a normally closed contact of the first relay, and is connected into a coil of another part of the output relay through a normally closed contact of the first relay and a normally open contact of the second relay KA 1; the power supply is connected into the coil of the third relay KA through the other path of the main switch SA, connected into the coil of the output relay connected with the normally open contact of the second relay KA1 through the first normally open contact of the third relay KA, and connected into the coil of the output relay connected with the normally closed contact of the first relay KA2 through the second normally open contact of the third relay KA.
Optionally, the main switch SA is used for transformer output access, and the input branch and/or the output branch formed by the main switch SA is connected in series with a power-off protection device for disconnecting the output relay of the protection device under the condition that the transformer output has overcurrent and overvoltage.
Another structure of the protection device provided by the present utility model is configured to include:
the main switch SA is configured to comprise a first poking piece, a closing end, a first opening end, a second opening end, a third opening end, a second poking piece and a third poking piece, wherein one end of the first poking piece is used as an input end of the protection device and used for one-phase electric access of the transformer, and the other end of the first poking piece is used for being communicated with the closing end or the first opening end to enable a power supply to be accessed; the first opening end is respectively and electrically connected with the second opening end and the third opening end, and one ends of the second poking piece and the third poking piece are respectively and electrically connected with the second opening end and the third opening end to enable a power supply to be connected;
a first switch configured to include a temperature control switch FR and a time control switch KT for sensing an ambient temperature;
a second switch configured to include a first relay KA2, a second relay KA1, and a third relay KA;
an output relay configured to include a plurality of normally open contacts configured to connect the transformer output to a load, the normally open contacts configured to connect the transformer output to the load when turned on;
the other end of the second shifting sheet is respectively connected with one end of a coil of the third relay KA, one end of a coil of an output relay connected with a normally open contact of the second relay KA1 through a first normally open contact of the third relay KA, and one end of a coil of the output relay connected with a normally open contact of the second relay KA1 and a normally closed contact of the first relay KA2 through a second normally open contact of the third relay KA; the other end of the third pulling piece is respectively connected with the temperature control switch FR and the time control switch KT through the normally closed contact of the third relay KA, is connected with one end of one or more coils of the output relay through the normally closed contact of the first relay KA2, and is connected with one end of the coil of the other part of the output relay through the normally closed contact of the first relay KA2 and the normally open contact of the first relay KA 1;
the coil of the first relay KA2 is connected in series between the temperature control switch FR and the low power supply, and the coil of the second relay KA1 is connected in series between the time control switch KT and the low power supply; the other end of the output relay coil and the other end of the coil of the third relay KA are used for being connected with another phase of the transformer.
Optionally, on the basis of the second structure, the device is further configured as a power-off protection device for opening the output relay of the protection device in case of overcurrent and overvoltage of the output of the transformer.
The technical effects which can be achieved by adopting the device of the utility model at least comprise:
1) The protection device is provided with the temperature control switch, so that the detection of the environmental temperature (the working environment of the transformer, the environmental temperature of the electric equipment and the environmental temperature of the power transmission line) is realized, and the operation is disconnected when the temperature reaches the operation condition of the temperature control switch, so that the output relay is disconnected, the power supply of an access load is disconnected, and the burning probability of the transformer is reduced to a certain extent.
2) The device is provided with the time control switch, so that the power consumption of the high, medium and low peak periods can be controlled according to the requirements, the sectional power consumption control is realized, and the power consumption cost is reduced.
3) The device is provided with a power-off protection device, acts when the high-low voltage three-phase circuit is in phase-failure, overvoltage and undervoltage, cuts off the load of the low-voltage line, protects the transformer from being damaged, realizes that equipment power supply can be timely cut off when the phase-failure, undervoltage, overvoltage and three-phase voltage are not usual, and better protects the transformer and the electric equipment from being burnt out.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model. It is evident that the drawings in the following description are only some embodiments of the utility model and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is an electrical schematic diagram of a protection device described in embodiment 1 of the present utility model;
FIG. 2 is an electrical schematic diagram of the protection device described in embodiment 2 of the present utility model;
FIG. 3 is an electrical schematic diagram of the protection device described in embodiment 3 of the present utility model;
FIG. 4 is an electrical schematic diagram of the protection device described in embodiment 4 of the present utility model;
FIG. 5 is an electrical schematic diagram of the protection device described in embodiment 5 of the present utility model;
FIG. 6 is an electrical schematic diagram of a protective device with a power-off protection device according to an embodiment of the present utility model;
KMn in the figure denotes an output relay, and n denotes the number of relays.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In order to avoid damage to the transformer caused by overload operation of the transformer, the utility model provides a protection device which can cut off the load and stop power supply in the overload state of the transformer. The device is configured to comprise a first switch, a second switch and an output relay, wherein the first switch is used for controlling the on-off of the second switch, and a normally open contact of the output relay is configured to connect the transformer outputs L1, L2 and L3 with a load, and the transformer output is connected with the load when the first switch is connected; the on-off of the normally open contact of the output relay is controlled by the second switch; the first switch is configured to include a temperature controlled switch. The electrical structure of the device will be described in detail with reference to the following examples.
Example 1
Referring to fig. 1, in this embodiment: the second switch is configured to include a first relay KA2 whose coil is connected in series between the temperature control switch FR and the low power supply, and a coil of the output relay is connected in series between a normally closed contact of the first relay KA2 and the low power supply, or a coil of the output relay is connected in series between a normally closed contact of the first relay KA2 and the transformer output. The output relay may be configured as one, two or more, each providing power to a different load.
In a normal working state of the device, a power supply is connected to a coil of an output relay through a normally closed contact of a first switch KA2, a normally open contact of the output relay is closed, and the output of a transformer is connected to a load to provide a working power supply for the load; the power supply is also connected with a temperature control switch FR, the temperature control switch FR senses the ambient temperature of the transformer, when the temperature reaches the closing condition (namely the condition of overload of the load), the temperature control switch FR is closed, the power supply is connected with a coil of a first relay KA2, the normally closed contact action of the power supply is disconnected, the coil of an output relay is powered off, the normally open contact of the output relay is disconnected, and the power supply connected with the load is cut off.
In this embodiment, the power supply may be turned on and off via the main switch SA.
Example 2
Referring to fig. 2, the second switch of the protection device of the present embodiment is configured to include a first relay KA2 and a third relay KA, and further includes a main switch SA configured to include a first paddle, a closed end, a first open end, a second open end, a third open end, a second paddle, and a third paddle, wherein one end of the first paddle is used as an input end of the protection device for power supply access, and the other end is used for connection with the closed end or the first open end; the first opening end is electrically connected with the second opening end and the third opening end respectively, and one ends of the second poking piece and the third poking piece are used for being electrically connected with the second opening end and the third opening end respectively, so that a power supply is connected.
The other end of the second poking piece is respectively connected with one end of a third relay KA coil, and one end connected with the output relay coil through a first normally open contact of the third relay KA, and the other end of the third relay KA coil is connected with a low power supply or a transformer output phase.
The other end of the third poking piece is connected with one end of a normally closed contact of the first relay KA2 and is connected with one end of a coil of the first relay KA2 through a temperature control switch FR; the other end of the normally closed contact of the first relay KA2 is connected with one end of an output relay coil, and the other end of the output relay coil is connected with a low power supply or a transformer output phase; the other end of the first relay KA2 coil is connected with a low power supply.
The working state of the device is as follows: when the first poking piece is connected with the first opening end, a power supply is connected with the device through the main switch SA, and when the device is in a normal working state, the third poking piece is connected with the third opening end, the second poking piece is disconnected with the second opening end, and the temperature control switch FR is disconnected; the power supply is connected to the coil of the output relay through the third shifting sheet and the normally closed contact of the first relay KA2, the normally open contact of the output relay is closed, and the output of the transformer is connected to the load to provide working power for the load.
The power supply is also connected with a temperature control switch FR, the temperature control switch FR senses the ambient temperature of the transformer, when the temperature reaches the closing condition (namely the condition of overload of the load), the temperature control switch FR is closed, the power supply is connected with a coil of a first relay KA2, the normally closed contact action of the power supply is disconnected, the coil of an output relay is powered off, the normally open contact of the output relay is disconnected, and the power supply connected with the load is cut off. In this state, through the switch-on of disconnection third plectrum and third open end, second plectrum and second open end switch-on, third relay KA action, output relay switch on again makes transformer output access load, has realized the unblock of overtemperature.
Example 3
Referring to fig. 3, in this embodiment: the first switch is further configured to comprise a time control switch KT, the second switch is configured to comprise a first relay KA2 and a second relay KA1, the coil of the first relay KA2 and the coil of the second relay KA1 are respectively connected in series between the temperature control switch FR, the time control switch KT and a low power supply, one end of a normally closed contact of the first relay KA2 is used for power supply access, the other end of the normally closed contact of the first relay KA2 is connected with one end of an output relay coil through a normally open contact of the second relay KA1, and the other end of the output relay coil is connected with the low power supply or a transformer output phase.
Under the normal operating condition of the device, the time control switch KT is closed, the temperature control switch FR is opened, the power supply is connected into the coil of the second relay KA1 through the time control switch KT, the normally open contact of the power supply is closed, the power supply is connected into the coil of the output relay through the normally closed contact of the first relay KA2 and the normally open contact of the second relay KA1, the normally open contact of the output relay is closed, and the output access load of the transformer provides a working power supply for the load.
The power supply is also connected with a temperature control switch FR, the temperature control switch FR senses the ambient temperature of the transformer, when the temperature reaches the closing condition (namely the condition of overload of the load), the temperature control switch FR is closed, the power supply is connected with a coil of a first relay KA2, the normally closed contact action of the power supply is disconnected, the coil of an output relay is powered off, the normally open contact of the output relay is disconnected, and the power supply connected with the load is cut off.
The on-off of the output relay can be controlled by a time control switch KT, when the time control switch KT is disconnected, the coil of the output relay is powered off, and the normally open contact of the output relay is disconnected, so that the power supply connected to a load is cut off. The time control switch KT can be configured as a manual switch or a time switch, and is opened or closed until a set time, such as a time switch formed by 555 timers.
In this embodiment, the power supply may be turned on and off via the main switch SA.
Example 4
Referring to fig. 4, in the present embodiment: the first switch is further configured to include a time-controlled switch KT, the second switch is configured to include a first relay KA2 and a second relay KA1, and the output relay is configured to be plural; the coil of the first relay KA2 and the coil of the second relay KA1 are respectively connected in series between the temperature control switch FR, the time control switch KT and the low power supply, one end of a normally closed contact of the first relay KA2 is used for power supply access, and the other end of the normally closed contact of the first relay KA2 is respectively connected with one end of a coil of a part of the output relay and one end of a normally open contact of the second relay KA 1; the other end of the normally open contact of the second relay KA1 is connected with one end of a coil of the other part of the output relay (the output relay which is not connected with the normally closed contact of the first relay KA 2), and the other end of the output relay coil is connected with a low power supply or a transformer output phase.
The device has realized transformer output part access load, respectively through temperature detect switch FR, time control open hang KT realization, and concrete mode includes:
mode one: when the device is in a normal working state, the time control switch KT is closed, the temperature control switch FR is opened, the power supply is connected into the coil of the second relay KA1 through the time control switch KT, the normally open contact of the second relay KA1 is closed, the power supply is connected into the output relay respectively connected with the first relay KA2 and the second relay KA1 through the normally closed contact of the first relay KA2 and the normally open contact of the second relay KA1, the coil is electrified, the normally open contact of the output relay is closed, and the output access load of the transformer provides working power for the load.
The power supply is also connected with a temperature control switch FR, the temperature control switch FR senses the ambient temperature of the transformer, when the temperature reaches the closing condition (namely the condition of overload of the load), the temperature control switch FR is closed, the power supply is connected with a coil of a first relay KA2, the normally closed contact action of the power supply is disconnected, the coil of an output relay is powered off, the normally open contact of the output relay is disconnected, and the power supply connected with the load is cut off.
In this mode, even if the time control switch KT is in a closed state, the transformer output cannot be connected to the load, and the same control of the output relay output is realized.
Mode two: when the device is in a normal working state, the time control switch KT is disconnected, the temperature control switch FR is disconnected, the second relay KA1 cannot work, and the output relay connected with the relay cannot supply power for a load connected with the relay. The power supply is connected with a coil of an output relay connected with the power supply through a normally closed contact of the first relay KA2, the coil is electrified, a normally open contact of the output relay is closed, and the output of the transformer is connected with a load to provide working power for the load.
The operation principle of the temperature control switch FR in this mode is the same as that described above, and will not be described here again. In this mode, the on-off control of part of the output relay is realized.
The on-off control of the output relay connected with the time control switch KT is realized through the on-off of the time control switch KT, when the time control switch KT is disconnected, the coil of the output relay connected with the time control switch KT is powered off, the normally open contact of the output relay is disconnected, and the power supply connected with a load is cut off.
Example 5
Referring to fig. 5, the protection device of the present embodiment is configured to include:
the main switch SA is configured to comprise a first poking piece, a closing end, a first opening end, a second opening end, a third opening end, a second poking piece and a third poking piece, wherein one end of the first poking piece is used as an input end of the protection device and is used for one-phase electric access of the transformer, and the other end of the first poking piece is used for being communicated with the closing end or the first opening end to enable a power supply to be accessed; the first opening end is respectively and electrically connected with the second opening end and the third opening end, and one ends of the second shifting sheet and the third shifting sheet are respectively and electrically connected with the second opening end and the third opening end to enable a power supply to be connected;
a first switch configured to include a temperature control switch FR and a time control switch KT for sensing an ambient temperature;
a second switch configured to include a first relay KA2, a second relay KA1, and a third relay KA;
an output relay configured to include a plurality of normally open contacts configured to connect the transformer output to a load, the normally open contacts configured to connect the transformer output to the load when turned on;
the other end of the second poking piece is respectively connected with one end of a coil of the third relay KA, one end of a coil of the output relay connected with a normally open contact of the second relay KA1 through a first normally open contact of the third relay KA, and one end of a coil of the output relay connected with a normally open contact of the second relay KA1 and a normally closed contact of the first relay KA2 through a second normally open contact of the third relay KA;
the other end of the third pulling piece is respectively connected with a temperature control switch FR and a time control switch KT through a normally closed contact of a third relay KA, is connected with one end of a coil of one or more output relays through a normally closed contact of a first relay KA2, and is connected with one end of a coil of the other part of the output relay through a normally closed contact of the first relay KA2 and a normally open contact of the first relay KA 1;
the coil of the first relay KA2 is connected in series between the temperature control switch FR and the low power supply, and the coil of the second relay KA1 is connected in series between the time control switch KT and the low power supply; the other end of the output relay coil and the other end of the coil of the third relay KA are used for being connected with the other phase of the transformer.
The time control switch KT is matched with the second relay KA1, the temperature control switch FR is matched with the first relay KA2 to respectively control the normally open contact of part of the output relay to be switched on and off, and the third relay KA is used for unlocking over-temperature (overload) locking; the main switch SA realizes the access of the power supply.
The protection device of this embodiment 1-embodiment 4 is also configured as a power-off protection device for opening the protection device output relay in the presence of an overcurrent and overvoltage condition of the transformer output. The power-off protection device may be configured as a fuse connected in series between the main switch SA input, and/or the output relay coil, the third relay KA coil, and the low power supply, as shown in FIG. 6.
The power-off protection device can also be configured to comprise a voltage protection device for detecting whether the transformer output has open-phase, overcurrent and overvoltage, wherein the transformer output is connected with the voltage protection device, and when the open-phase, overcurrent and overvoltage occur, the power supply connected with the main switch SA is cut off, so that the damage of the load and the protection device caused by the abnormality of the transformer output is avoided.
The power supply described herein may be configured to be provided as a stand-alone power supply or may be provided directly from the transformer output.
The present disclosure has been described with respect to the above-described embodiments, however, the above-described embodiments are merely examples of implementation of the present disclosure. It must be noted that the disclosed embodiments do not limit the scope of the present disclosure. Rather, the foregoing is considered to be illustrative, and it is to be understood that the utility model is not limited to the specific details disclosed herein.
Claims (9)
1. A transformer protection device, characterized in that the device is configured to comprise a first switch, a second switch and an output relay, wherein the first switch is used for controlling the on-off of the second switch, and a normally open contact of the output relay is configured to connect the output of a transformer with a load, and the output of the transformer is connected with the load when the normally open contact is connected; the on-off of the normally open contact of the output relay is controlled by the second switch;
the first switch is configured to include a temperature controlled switch.
2. The transformer protection device of claim 1, wherein the second switch is configured as a first relay KA2; the power supply is connected into the coil of the first relay KA2 through the temperature control switch FR, and is connected into the coil of the output relay through the normally closed contact of the first relay KA 2.
3. The transformer protection device of claim 1, wherein the first switch is further configured to include a time controlled switch KT, the second switch is configured to be a first relay KA2 and a second relay KA1, a power source is connected to a coil of the first relay KA2 via the temperature controlled switch FR, to a coil of the second relay KA1 via the time controlled switch KT, and to the output relay coil via a normally closed contact of the first relay KA2 and a normally open contact of the second relay KA 1.
4. The transformer protection device of claim 1, wherein the first switch is further configured to include a timed switch KT, the second switch is configured to include a first relay KA2 and a second relay KA1, and the output relays are configured in groups; the power supply is connected into the coil of the first relay KA2 through the temperature control switch FR, is connected into the coil of the second relay KA1 through the time control switch KT, is connected into the coil of the partial output relay through the normally closed contact of the first relay KA2, and is connected into the coil of the other partial output relay through the normally closed contact of the first relay KA2 and the normally open contact of the second relay KA 1.
5. The transformer protection device according to any one of claims 2-4, further comprising a main switch SA through which a power supply is connected, and a power-off protection device connected in series to an input branch and/or an output branch of the main switch SA for switching off an output relay of the protection device in case of an overcurrent and overvoltage of a transformer output.
6. The transformer protection device of claim 1, wherein the first switch is configured to include a temperature control switch FR and a time control switch KT, the second switch is configured to include a first relay KA2, a second relay KA1, and a third relay KA, the output relays are configured in groups; the power supply is divided into two paths through a main switch SA, one path is connected into a coil of a first relay KA2 through a temperature control switch FR, is connected into a coil of a second relay KA1 through a time control switch KT, is connected into a coil of a part of an output relay through a normally closed contact of the first relay, and is connected into a coil of another part of the output relay through a normally closed contact of the first relay and a normally open contact of the second relay KA 1; the power supply is connected into the coil of the third relay KA through the other path of the main switch SA, connected into the coil of the output relay connected with the normally open contact of the second relay KA1 through the first normally open contact of the third relay KA, and connected into the coil of the output relay connected with the normally closed contact of the first relay KA2 through the second normally open contact of the third relay KA.
7. The transformer protection device according to claim 6, wherein the main switch SA is used for transformer output connection, and a power-off protection device for disconnecting an output relay of the protection device under the condition that the transformer output has overcurrent and overvoltage is connected in series on an input branch and/or an output branch formed by the main switch SA.
8. A transformer protection device, the device being configured to include:
the main switch SA is configured to comprise a first poking piece, a closing end, a first opening end, a second opening end, a third opening end, a second poking piece and a third poking piece, wherein one end of the first poking piece is used as an input end of the protection device and used for one-phase electric access of the transformer, and the other end of the first poking piece is used for being communicated with the closing end or the first opening end to enable a power supply to be accessed; the first opening end is respectively and electrically connected with the second opening end and the third opening end, and one ends of the second poking piece and the third poking piece are respectively and electrically connected with the second opening end and the third opening end to enable a power supply to be connected;
a first switch configured to include a temperature control switch FR and a time control switch KT for sensing an ambient temperature;
a second switch configured to include a first relay KA2, a second relay KA1, and a third relay KA;
an output relay configured to include a plurality of normally open contacts configured to connect the transformer output to a load, the normally open contacts configured to connect the transformer output to the load when turned on;
the other end of the second shifting sheet is respectively connected with one end of a coil of the third relay KA, one end of a coil of an output relay connected with a normally open contact of the second relay KA1 through a first normally open contact of the third relay KA, and one end of a coil of the output relay connected with a normally open contact of the second relay KA1 and a normally closed contact of the first relay KA2 through a second normally open contact of the third relay KA;
the other end of the third pulling piece is respectively connected with the temperature control switch FR and the time control switch KT through the normally closed contact of the third relay KA, is connected with one end of one or more coils of the output relay through the normally closed contact of the first relay KA2, and is connected with one end of the coil of the other part of the output relay through the normally closed contact of the first relay KA2 and the normally open contact of the first relay KA2;
the coil of the first relay KA2 is connected in series between the temperature control switch FR and the low power supply, and the coil of the second relay KA1 is connected in series between the time control switch KT and the low power supply; the other end of the output relay coil and the other end of the coil of the third relay KA are used for being connected with another phase of the transformer.
9. The transformer protection device of claim 8, further configured as a power-off protection device for opening the protection device output relay in the presence of an over-current, over-voltage condition at the transformer output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320267545.3U CN219498938U (en) | 2023-02-21 | 2023-02-21 | Transformer protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320267545.3U CN219498938U (en) | 2023-02-21 | 2023-02-21 | Transformer protection device |
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| CN219498938U true CN219498938U (en) | 2023-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320267545.3U Active CN219498938U (en) | 2023-02-21 | 2023-02-21 | Transformer protection device |
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| CN (1) | CN219498938U (en) |
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2023
- 2023-02-21 CN CN202320267545.3U patent/CN219498938U/en active Active
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