CN213072096U - Electrical equipment and PT secondary circuit broken string blocking control device thereof - Google Patents
Electrical equipment and PT secondary circuit broken string blocking control device thereof Download PDFInfo
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- CN213072096U CN213072096U CN202022357080.XU CN202022357080U CN213072096U CN 213072096 U CN213072096 U CN 213072096U CN 202022357080 U CN202022357080 U CN 202022357080U CN 213072096 U CN213072096 U CN 213072096U
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Abstract
The utility model discloses an electrical equipment and PT secondary circuit broken string shutting controlling means thereof, this broken string shutting controlling means includes first air switch, detection device and blocking device, first air switch is connected with the three-phase and detection device of secondary circuit, detection device includes the relay that second air switch and secondary circuit set up between arbitrary two-phase, one relay locates the input of first air switch as leading relay in all relays, another two relays locate the output of first air switch as trailing relay, leading relay and second air switch are established ties, second air switch is greater than at least two range differences of first air switch, detection device is used for exporting first signal when at least one looks broken string in the secondary circuit; the locking device is connected with the detection device and used for generating a locking signal after receiving the first signal. The device can judge the disconnection of the PT secondary circuit, so that the related protection can be locked to avoid misoperation.
Description
Technical Field
The utility model relates to an electrical equipment technical field, in particular to PT secondary circuit broken string shutting controlling means. The utility model discloses still relate to an electrical equipment who has this PT secondary circuit broken string shutting controlling means.
Background
A voltage transformer (PT for short) converts a high voltage of a primary system into a required low voltage, and supplies the low voltage to a measuring instrument, a telecontrol device, a relay protection device, an automatic device, and the like. The three-phase air switch of the secondary circuit of the voltage transformer consists of three single-phase air switches, and under the condition that the secondary circuit of the voltage transformer is grounded and short-circuited, the air switches are partially or completely disconnected, so that the secondary circuit of the voltage transformer is disconnected, and thus, a relay protection and safety action device connected with the lower port of the air switch of the secondary circuit of the voltage transformer in parallel can not collect the voltage of the disconnected phase, and the misoperation of the device is caused.
In the prior art, a relay protection and safety automatic device is generally adopted to utilize the PT disconnection alarm locking function of the device, when a secondary circuit of a voltage transformer is disconnected, the locking device avoids misoperation through judgment and self related protection, however, the PT disconnection locking function of the relay protection and safety automatic device has certain defects, and the relay protection and the safety automatic device cannot judge PT two-phase disconnection under certain special working conditions, so that the related protection cannot be locked, and the misoperation is caused; in addition, there are products that protect the measurement and control device through the voltage transformer to judge the secondary circuit of the voltage transformer is broken, it mainly converts the analog quantity into digital quantity through the software and hardware devices such as analog quantity input circuit, and compares with the low voltage constant value of input, the device lower than the setting value outputs the alarm signal, and can output the locking signal, however, the above-mentioned setting mode will increase the production cost, bring the economic pressure to the enterprise.
Therefore, how to avoid increasing the production cost caused by the fact that the voltage transformer protection measurement and control device judges that the secondary circuit of the voltage transformer is broken is a technical problem which needs to be solved by technical personnel in the field at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a PT secondary circuit broken string shutting controlling means, the device can judge PT secondary circuit broken string to can block relevant protection, in order to avoid the malfunction. Another object of the present invention is to provide an electrical apparatus including the above PT secondary circuit disconnection locking control device.
In order to achieve the above object, the present invention provides a PT secondary circuit disconnection locking control device, including a first air switch, a detection device and a locking device, wherein the first air switch is respectively connected with three phases of a secondary circuit and the detection device, the detection device includes a second air switch and a relay disposed between any two phases of the secondary circuit, one of the relays is disposed at an input end of the first air switch as a front relay, the other two relays are disposed at an output end of the first air switch as a rear relay, the front relay is connected in series with the second air switch, the second air switch is larger than at least two pole differences of the first air switch, and the detection device is configured to output a first signal when at least one phase in the secondary circuit is disconnected; the locking device is connected with the detection device and used for generating a locking signal after receiving the first signal.
Optionally, the latching device comprises a latching relay having normally open contacts.
Optionally, it is three the first end of the normally closed contact of relay all with latching relay's first end is connected, and is three the common port behind the second end interconnect of the normally closed contact of relay is connected with three the common port behind the first end interconnect of the normally open contact of relay is connected, and is three the second end of the normally open contact of relay all is connected with the power negative pole, latching relay's second end and power positive pole are connected.
Optionally, any of the relays is a voltage relay.
Optionally, the first air switch includes a first switch contact, a second switch contact and a third switch contact which are respectively arranged at three phases of the secondary circuit.
Optionally, the alarm device is connected with the locking device and used for alarming after receiving the locking signal.
Optionally, the alarm device is a buzzer or an indicator light.
The utility model also provides an electrical equipment, including above-mentioned arbitrary PT secondary circuit broken string shutting controlling means.
Against the background, the embodiment of the present invention provides a PT secondary circuit disconnection locking control device, which comprises a first air switch, a detection device and a locking device, wherein the first air switch is respectively connected to three phases of the secondary circuit and the detection device, the detection device comprises a second air switch and three relays, any relay is disposed between any two phases of the secondary circuit, one relay of all relays is disposed at an input end of the first air switch as a front relay, the other two relays are disposed at an output end of the first air switch as rear relays, the front relay is connected in series with the second air switch, the second air switch is larger than the first air switch by at least two differences, the detection device is configured to output a first signal when at least one phase of the secondary circuit is disconnected, the locking device is connected with the detection device, the locking device is configured to generate a locking signal after receiving the first signal, for use by associated devices. The PT secondary circuit broken string shutting controlling means that so sets up, its beneficial effect mainly includes: through the connection of first air switch, second air switch, three relay and blocking device to realize the judgement of PT secondary circuit broken string, can see, take place the broken string at PT secondary circuit, including single-phase broken string, during two-phase broken string or three-phase broken string, detection device all can be through corresponding relay action in order to output first signal, thereby realize that blocking device receives and generates the blocking signal after the first signal, in order to supply relevant equipment to use, can realize the relevant protection of shutting like this, can not cause the protection maloperation, be favorable to reducing or even avoid because the economic loss that the broken string malfunction caused.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a PT secondary circuit disconnection locking control device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The core of the utility model is to provide a PT secondary circuit broken string shutting controlling means, the device can judge PT secondary circuit broken string to can block relevant protection, in order to avoid the malfunction. The utility model discloses a another core provides an electrical equipment including above-mentioned PT secondary circuit broken string shutting controlling means.
In order to make the technical field of the present invention better understand, the present invention will be described in detail with reference to the accompanying drawings and the detailed description.
Referring to fig. 1, fig. 1 is a schematic circuit diagram of a PT secondary circuit disconnection locking control device according to an embodiment of the present invention.
The embodiment of the utility model provides a PT secondary circuit broken string blocking controlling means that closes that provides, including first air switch, detection device and blocking device, wherein, first air switch is connected with the three-phase of secondary circuit and detection device respectively, detection device includes second air switch and three relay, arbitrary relay is located between arbitrary two-phase of secondary circuit, and one relay locates the input of first air switch as leading relay in all relays, and two other relays locate the output of first air switch as trailing relay, leading relay and second air switch are established ties, second air switch is greater than first air switch at least two range, detection device is used for exporting first signal when at least one looks broken string in the secondary circuit, blocking device and detection device are connected, blocking device is used for producing blocking signal after receiving first signal, for use by associated devices.
Therefore, through the connection of the first air switch, the second air switch, the three relays and the locking device, the judgment of the PT secondary circuit disconnection is realized, it can be seen that when the PT secondary circuit is disconnected and comprises single-phase disconnection, two-phase disconnection or three-phase disconnection, the detection device can output a first signal through the action of the corresponding relays, and the locking device generates a locking signal after receiving the first signal so as to be used by related equipment.
Specifically, as shown in fig. 1, the PT secondary circuit includes a phase a, a phase B, and a phase C, wherein three relays are provided as voltage relays, 1YJ, 2YJ, and 3YJ, respectively, wherein 1YJ and 2YJ are provided as a rear relay at an output terminal of the first air switch, 3YJ is provided as a front relay at an input terminal of the first air switch, that is, 3YJ is provided at an upper port of the first air switch, and 1YJ and 2YJ are provided at a lower port of the first air switch. Specifically, 1YJ was connected in parallel to A, B phases, 2YJ was connected in parallel to B, C phases, and 3YJ was connected in parallel to A, C phases; the first air switch 1QF is composed of three single-phase air switches, specifically, the first air switch 1QF includes A, B, C three-phase first, second and third switch contacts respectively arranged in the secondary circuit; the second air switch 2QF is connected to the phase a and the phase C, and the second air switch 2QF is connected in series with the front relay 3YJ, and the second air switch 2QF is provided at the upper port of the front relay 3 YJ.
It should be noted that the second air switch 2QF is at least two pole differences greater than the first air switch 1QF, so that the first air switch 1QF acts before the second air switch 2QF when the PT secondary circuit is short-circuited or grounded. Further, the low voltage constant values of the 1YJ, 2YJ, and 3YJ voltage relays are set to 30V, that is, the relays are operated when the voltage is greater than 30V, and the relays are not operated when the voltage is less than 30V. Of course, the voltage value of the relay action may be set to other values calculated according to the setting.
Of course, the latching device is preferably a latching relay BSJ, B1 and B2 having a normally open contact BSJ1 as a latching output line according to actual needs.
More specifically, among them, the normally closed nodes (1YJ1, 2YJ1, 3YJ1), the normally open nodes (1YJ2, 2YJ2, 3YJ2), and the latching relay (BSJ) of the 1YJ, 2YJ, 3YJ voltage relays constitute a loop. As shown in fig. 1, the first ends of the normally closed contacts (1YJ1, 2YJ1, 3YJ1) of the three relays are all connected with the first end of the latching relay BSJ, the common end of the normally closed contacts (1YJ1, 2YJ1, 3YJ1) of the three relays after the second ends are connected with each other is connected with the common end of the normally open contacts (1YJ2, 2YJ2, 3YJ2) of the three relays after the second ends are connected with each other, the second ends of the normally open contacts (1YJ2, 2YJ2, 3YJ2) of the three relays are all connected with the negative electrode of the power supply, and the second ends of the latching relays are connected with the positive electrode of the power supply.
In other words, the normally closed contacts (1YJ1, 2YJ1, 3YJ1) of the three relays after being connected in parallel, the normally open contacts (1YJ2, 2YJ2, 3YJ2) of the three relays after being connected in parallel, and the latching relay (BSJ) are connected in series with each other.
It can be seen that:
when the PT secondary circuit is not disconnected, the relays 1YJ, 2YJ, and 3YJ operate, and the normally closed contacts 1YJ1, 2YJ1, and 3YJ1 are opened, so that the latching relay BSJ does not operate, and no output is provided to the B1 and B2.
When the PT secondary circuit generates 1QF and the first switch contact of A phase is opened, the relay 1YJ does not act, the relays 2YJ and 3YJ act, the normally closed contact of 1YJ1 is closed, the normally open contacts of 2YJ2 and 3YJ2 are closed, so that the latching relay BSJ acts, the normally open contact BSJ1 is closed, and the B1 and B2 can output latching signals.
When the PT secondary circuit is subjected to 1QF and B-phase second switch contact disconnection, the relays 1YJ and 2YJ do not act, the relay 3YJ acts, the normally closed contacts 1YJ1 and 2YJ1 are closed, the normally open contact 3YJ2 is closed, therefore, the latching relay BSJ acts, the normally open contact BSJ1 is closed, and the B1 and B2 can output latching signals.
When the PT secondary circuit is subjected to 1QF and C-phase third switch contact disconnection, the relay 2YJ does not act, the relays 1YJ and 3YJ act, the normally closed contact of the relay 2YJ1 is closed, and the normally open contacts of the relay 1YJ2 and the relay 3YJ2 are closed, so that the latching relay BSJ acts, the normally open contact BSJ1 is closed, and the latching signals can be output by B1 and B2.
When the PT secondary circuit is subjected to 1QF, two phases of switch contacts of A, B are disconnected, the relays 1YJ and 2YJ do not act, the relay 3YJ acts, normally closed contacts of 1YJ1 and 2YJ1 are closed, a normally open contact of 3YJ2 is closed, therefore, the latching relay BSJ acts, the normally open contact BSJ1 is closed, and latching signals can be output by B1 and B2.
When the PT secondary circuit is subjected to 1QF, two phases of switch contacts of B, C are disconnected, the relays 1YJ and 2YJ do not act, the relay 3YJ acts, normally closed contacts of 1YJ1 and 2YJ1 are closed, a normally open contact of 3YJ2 is closed, therefore, the latching relay BSJ acts, the normally open contact BSJ1 is closed, and latching signals can be output by B1 and B2.
When the PT secondary circuit is subjected to 1QF, two phases of switch contacts of A, C are disconnected, the relays 1YJ and 2YJ do not act, the relay 3YJ acts, normally closed contacts of 1YJ1 and 2YJ1 are closed, a normally open contact of 3YJ2 is closed, therefore, the latching relay BSJ acts, the normally open contact BSJ1 is closed, and latching signals can be output by B1 and B2.
When the PT secondary circuit is subjected to 1QF switch-off of A, B, C three-phase switch contacts, the relays 1YJ and 2YJ do not act, the relay 3YJ acts, normally closed contacts 1YJ1 and 2YJ1 are closed, a normally open contact 3YJ2 is closed, so that the latching relay BSJ acts, the normally open contact BSJ1 is closed, and latching signals can be output by B1 and B2.
When the PT secondary circuit is in 2QF disconnection, the relay 3YJ does not act, the relays 1YJ and 2YJ act, the normally closed contact of the relay 3YJ1 is closed, the normally open contacts of the relays 1YJ2 and 2YJ2 are closed, so that the latching relay BSJ acts, the normally open contact BSJ1 is closed, and the latching signals can be output by the relays B1 and B2.
It should be noted that, in the case of any two-phase and three-phase disconnection of the PT secondary circuit, since the second air switch 2QF is at least two steps greater than the first air switch 1QF, the first air switch 1QF operates prior to the second air switch 2QF, so that 2QF does not operate, and the relay 3YJ operates at this time.
In order to realize the locking protection, the PT secondary circuit disconnection locking control device also comprises an alarm device connected with the locking device, and the alarm device is used for giving an alarm after receiving the locking signal. Of course, the alarm device is specifically one of a buzzer or an indicator light.
The utility model provides an electrical device, which comprises a PT secondary circuit broken line locking control device described in the above embodiment; other parts of the electrical apparatus can be referred to the prior art and are not expanded herein.
It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
It is right above the utility model provides an electrical equipment and PT secondary circuit broken string shutting controlling means thereof have introduced in detail. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the solution and its core idea of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (8)
1. A PT secondary circuit disconnection locking control device is characterized by comprising a first air switch, a detection device and a locking device, wherein the first air switch is respectively connected with three phases of a secondary circuit and the detection device, the detection device comprises a second air switch and a relay arranged between any two phases of the secondary circuit, one relay in all the relays is arranged at the input end of the first air switch as a front relay, the other two relays are arranged at the output end of the first air switch as rear relays, the front relay is connected with the second air switch in series, the second air switch is larger than the first air switch by at least two pole differences, and the detection device is used for outputting a first signal when at least one phase in the secondary circuit is disconnected; the locking device is connected with the detection device and used for generating a locking signal after receiving the first signal.
2. The PT secondary circuit disconnect lockout control device of claim 1, wherein the lockout device comprises a lockout relay having normally open contacts.
3. The PT secondary circuit disconnection lockout control device of claim 2, wherein first ends of the normally closed contacts of the three relays are all connected to the first end of the lockout relay, a common end of the normally closed contacts of the three relays, after being connected to each other, is connected to a common end of the normally open contacts of the three relays, after being connected to each other, the second ends of the normally open contacts of the three relays are all connected to a negative electrode of a power supply, and a second end of the lockout relay is connected to a positive electrode of the power supply.
4. The PT secondary circuit disconnect lockout control device of claim 3, wherein any of the relays is a voltage relay.
5. The PT secondary circuit disconnect lockout control device of claim 1 wherein the first air switch includes first, second and third switch contacts that are separated by three phases of the secondary circuit.
6. The PT secondary circuit disconnection lockout control device of any of claims 1-5, further comprising an alarm device coupled to the lockout device to alarm upon receipt of the lockout signal.
7. The PT secondary circuit disconnection lockout control device of claim 6, wherein the alarm device is a buzzer or an indicator light.
8. An electric apparatus, comprising the PT secondary circuit disconnection lockout control device of any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022357080.XU CN213072096U (en) | 2020-10-21 | 2020-10-21 | Electrical equipment and PT secondary circuit broken string blocking control device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022357080.XU CN213072096U (en) | 2020-10-21 | 2020-10-21 | Electrical equipment and PT secondary circuit broken string blocking control device thereof |
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| Publication Number | Publication Date |
|---|---|
| CN213072096U true CN213072096U (en) | 2021-04-27 |
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| CN202022357080.XU Active CN213072096U (en) | 2020-10-21 | 2020-10-21 | Electrical equipment and PT secondary circuit broken string blocking control device thereof |
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| CN (1) | CN213072096U (en) |
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