CN215185833U - A shutting on-load voltage regulation device for main transformer overload - Google Patents
A shutting on-load voltage regulation device for main transformer overload Download PDFInfo
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- CN215185833U CN215185833U CN202121046254.9U CN202121046254U CN215185833U CN 215185833 U CN215185833 U CN 215185833U CN 202121046254 U CN202121046254 U CN 202121046254U CN 215185833 U CN215185833 U CN 215185833U
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Abstract
The utility model relates to the technical field of power distribution, in particular to a locking on-load voltage regulation device for overload of a main transformer, which comprises a current transformer, a current relay and an on-load voltage regulation switch electric mechanism; the current transformer, the power supply unit and the main transformer form a closed loop; the current transformer and the on-load voltage regulating switch electric mechanism are respectively connected with the current relay; the current relay is used for controlling the power supply unit and controlling the main transformer through the on-load tap changer electric mechanism; the on-load tap changer electric machine is provided with an overcurrent lock normally open node connected with the current relay, the overcurrent lock normally open node configured to enable the on-load tap changer electric machine to power off when switched on. Therefore, the locking function is kept when the main transformer is overloaded, and the normal operation of the main transformer is ensured.
Description
Technical Field
The utility model relates to an electric power distribution technical field, in particular to a shutting on-load voltage regulation device for main transformer overload.
Background
At present, the overload locking on-load voltage regulation is mainly realized by transformer backup protection, and when the transformer runs in an overload mode and the operation of an on-load voltage regulation gear is forbidden, a main transformer on-load voltage regulation secondary circuit is locked by a remote place. Although the scheme is feasible, the on-load tap changer can still be manually shifted up and down when an electric mechanism of the on-load tap changer is manually operated in a transformer substation on duty by few people, and the locking cannot be realized. This malfunction may cause excessive current flow and lead to tap burn-out. At present, according to the requirements of the national grid company standard Q/GDW 130003.1-2018, the overcurrent locking of the transformer is realized by the transformer body, and the locking function of the main transformer during overcurrent is urgently needed to be realized.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem existing in the prior art, therefore the utility model provides a shutting on-load voltage regulation device for main transformer overload can realize the shutting effect when main transformer overcurrent.
In order to achieve the above object, the present invention provides a locking on-load voltage regulation device for main transformer overload, which comprises a current transformer, a current relay and an on-load voltage regulation switch electric mechanism; the current transformer, the power supply unit and the main transformer form a closed loop; the current transformer and the on-load voltage regulating switch electric mechanism are respectively connected with the current relay; the current relay is used for controlling the power supply unit and controlling the main transformer through the on-load tap changer electric mechanism; the on-load tap changer electrical mechanism is provided with an overcurrent lock normally open node connected with the current relay, the overcurrent lock normally open node configured such that the on-load tap changer electrical mechanism is capable of de-energizing when switched on.
Furthermore, a clamping piece web plate is arranged on the main transformer and used for clamping the current transformer and playing an insulating role; and a high-voltage lead of the main transformer penetrates through the web plate of the clamping piece.
Further, the clip web includes laminate a and laminate B, the current transformer being disposed between laminate a and laminate B.
Further, the current relay is matched with the secondary current of the current transformer.
Furthermore, a timing unit is arranged on the current relay and used for setting the time delay action time of the current relay.
Compared with the prior art, the beneficial effects of the utility model are that: when the main transformer is in overcurrent, the on-load voltage regulating switch electric mechanism is powered off through the connection of the overcurrent locking normally-open node, so that the locking effect of the main transformer is ensured; meanwhile, the situation of frequent locking caused by continuous change of current is avoided.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an electrical schematic diagram of the present invention.
Fig. 3 is an installation diagram of the current transformer of the present invention on the main transformer.
Wherein: 1. a current transformer; 2. a main transformer; 3. a clamp web; 31. a laminate A; 32. and (B) a laminate.
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.
Examples
Referring to fig. 1 to 3, the present invention provides a locking on-load voltage regulation device for overload of a main transformer, including: the current transformer 1, the current relay and the on-load tap changer electric mechanism; the current transformer 1, the power supply unit and the main transformer 2 form a closed loop; the current transformer 1 and the on-load voltage regulating switch electric mechanism are respectively connected with a current relay; the current relay is used for controlling the power supply unit and controlling the main transformer 2 through the on-load tap changer electric mechanism; the on-load tap changer electric mechanism is provided with an overcurrent locking normally-open node connected with the current relay, and when the overcurrent locking normally-open node is switched on, the on-load tap changer electric mechanism can be powered off.
As an embodiment of the present invention, as shown in fig. 3, a clamping web 3 is disposed on a main transformer 2, and the clamping web 3 is used for clamping a current transformer 1 and playing an insulating role; the high-voltage lead of the main transformer 2 passes through the clamping piece web 3.
Preferably, the clip web 3 comprises a laminate a31 and a laminate B32, the current transformer 1 being arranged between said laminates a31 and B32 and being fixed to the main transformer 2.
As an embodiment of the utility model, the secondary current phase-match of current relay and current transformer 1.
As shown in fig. 2, when the main transformer 2 is overloaded, the corresponding node of the current relay is closed through the action of the current transformer 1, and the power supply of the on-load tap changer electric mechanism is cut off. The power supply of the on-load tap changer electric mechanism is controlled through the current relay, so that the on-load tap changer electric mechanism can be effectively locked under the condition of overload. Under the condition that the main transformer 2 is overloaded, the electric mechanism of the on-load tap changer loses power, and at the moment, no matter remote or local operation is carried out, the gear cannot be adjusted, so that the aim of effectively locking on-load tap changing of the main transformer 2 due to overload can be achieved; the problem of main transformer 2 can only realize the remote shutting when overloading the operation, can't implement shutting voltage regulation to main transformer 2 on the spot is solved, transformer normal operating has been guaranteed. The overload here is generally 1.2 times the rated current.
As another embodiment of the present invention, a timing unit is provided on the current relay, and the timing unit is used for setting the delay action time of the current relay. The specific process of this embodiment is as follows:
the output end of a current transformer 1 on a main transformer 2 is connected with the input end of a current relay. The current relay is connected with an overcurrent locking node of the on-load voltage regulating switch electric mechanism. The current transformer 1 is used as a current sampling point to transmit signals to the current relay, the primary current of the current transformer is selected according to 1.2 times of rated current of the high-voltage side of the main transformer 2, and the secondary current is generally selected to be 2A or 5A. The on-load tap changer motor can also be referred to as an on-load tap changer motor or an on-load tap changer motor.
The current relay is installed in a transformer terminal box, and the type of the current relay needs to be matched with the current transformer 1. The overload current and the overload current delay action time of the current relay need to be set correspondingly. According to the setting, the current relay carries out overcurrent monitoring under the condition that the power supply is switched on. The current relay is arranged in a time delay mode through a timing unit in the current relay.
If the monitored value exceeds the set threshold before the set start-up delay is complete, the current relay does not change its state. And when the monitoring value exceeds a set threshold value and the duration time exceeds a set delay starting time, the current relay acts. Therefore, the situation of frequent locking caused by continuous change of current can be avoided.
The current relay is connected with an overcurrent locking node of the on-load tap changer electric mechanism, when the current relay acts, the overcurrent locking node is switched on, and the on-load tap changer electric mechanism loses power, so that the main transformer can not be subjected to switch gear adjustment in a remote place or a field.
Furthermore, the utility model discloses before the use, at first calculate the high-pressure side rated current of main transformer 2, select current transformer 1's primary current according to 1.2 times (getting the integer) of high-pressure side rated current, current relay's action current is selected according to 1.2 of 2 rated currents of main transformer. Taking an SZ11-20000/35 transformer as an example, the rated current of the high-voltage side is 329.9a, the primary current I of the current transformer 1 is 1.2 × 329.9 is 395.9a, and the current ratio of the current transformer 1 is 400a and 400/5. The operating current of the current relay is 395.9a, and if the operating current needs to be converted to two times, it is 4.95A.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. Therefore, the above-described embodiments of the present invention should be considered only as illustrative and not restrictive in any way, the scope of the present invention being indicated by the claims, and any changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (5)
1. A locking on-load voltage regulation device for overload of a main transformer is characterized by comprising a current transformer (1), a current relay and an on-load voltage regulation switch electric mechanism; the current transformer (1), the power supply unit and the main transformer (2) form a closed loop; the current transformer (1) and the on-load voltage regulating switch electric mechanism are respectively connected with the current relay; the current relay is used for controlling the power supply unit and controlling the main transformer (2) through the on-load tap changer electric mechanism; the on-load tap changer electrical mechanism is provided with an overcurrent lock normally open node connected with the current relay, the overcurrent lock normally open node configured such that the on-load tap changer electrical mechanism is capable of de-energizing when switched on.
2. The latching on-load voltage regulation device according to claim 1, characterized in that a clamping web (3) is arranged on the main transformer (2), and the clamping web (3) is used for clamping the current transformer (1) and playing an insulating role; the high-voltage lead of the main transformer (2) passes through the clamping piece web (3).
3. Latching on-load tap changer according to claim 2, characterized in that the clip web (3) comprises a laminate a (31) and a laminate B (32), the current transformer (1) being arranged between the laminate a (31) and the laminate B (32).
4. A locking on-load tap changer according to any one of claims 1 to 3, characterized in that the current relay is matched to the secondary current of the current transformer (1).
5. The latching on-load voltage regulation device according to claim 4, wherein a timing unit is provided on the current relay, and the timing unit is used for setting the time delay action time of the current relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121046254.9U CN215185833U (en) | 2021-05-17 | 2021-05-17 | A shutting on-load voltage regulation device for main transformer overload |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121046254.9U CN215185833U (en) | 2021-05-17 | 2021-05-17 | A shutting on-load voltage regulation device for main transformer overload |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215185833U true CN215185833U (en) | 2021-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121046254.9U Active CN215185833U (en) | 2021-05-17 | 2021-05-17 | A shutting on-load voltage regulation device for main transformer overload |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215185833U (en) |
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2021
- 2021-05-17 CN CN202121046254.9U patent/CN215185833U/en active Active
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