CN211209287U - Zero sequence protection device and high-voltage station service protection equipment - Google Patents

Zero sequence protection device and high-voltage station service protection equipment Download PDF

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Publication number
CN211209287U
CN211209287U CN201922229751.1U CN201922229751U CN211209287U CN 211209287 U CN211209287 U CN 211209287U CN 201922229751 U CN201922229751 U CN 201922229751U CN 211209287 U CN211209287 U CN 211209287U
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transformer
terminal
current transformer
protection
zero sequence
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CN201922229751.1U
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Inventor
冯启明
陈凌宇
何志豪
张勇
李迪明
孙引魁
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China Resources Power Yichang Co Ltd
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China Resources Power Yichang Co Ltd
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Abstract

The utility model belongs to the technical field of the power system protection, a zero sequence protection device and high pressure service protective equipment are disclosed. This zero sequence protection device includes: the zero-sequence protection system of the generator-transformer group comprises a first current transformer group, a second current transformer group, a first protection connecting sheet, a second protection connecting sheet and a generator-transformer group transformer, wherein the first current transformer group is connected with the generator-transformer group transformer through the first protection connecting sheet, and the second current transformer group is connected with the generator-transformer group transformer through the second protection connecting sheet; the interconnection switch zero sequence protection system comprises a first interconnection switch and a second interconnection switch; the zero sequence protection device is used for connecting the first current transformer group and the first interconnection switch when the first protection connecting piece is disconnected, and connecting the second current transformer group and the second interconnection switch when the second protection connecting piece is disconnected, and the zero sequence protection of the interconnection switch is realized through the mode.

Description

Zero sequence protection device and high-voltage station service protection equipment
Technical Field
The utility model relates to an electric power system protects technical field, especially relates to a zero sequence protection device and high-pressure service protective equipment.
Background
With the rapid development of economy in China, higher requirements are made on the stability of a power system, a transformer is used as an important component of the power system, and the stable operation of the transformer is more and more important, so that higher requirements are made on the protection of the transformer. Wherein, the transformer for high voltage plant uses the interconnection switch to adopt and to connect in case bus mode altogether to satisfy the unit accident and shut down standby function. However, the interconnection switch only has two sections of overcurrent zero sequence protection and no zero sequence protection, and when the common-box bus has a ground fault, the risk of override tripping exists, so that the safe operation of the unit is influenced. Because the common-box bus only has A, B, C three-phase bus bars, a zero-sequence current transformer with enough size can not penetrate, and the zero-sequence current transformer which can penetrate cannot be customized at present; the zero-sequence protection of the interconnection switch adopts a self-produced zero-sequence current method, namely, a special zero-sequence current transformer is not arranged, and the zero-sequence protection can be obtained by adopting related wiring of transformers used by other devices, for example, secondary windings of three types of current transformers with the same specification are connected in parallel to lead out two wires (the two wires can be connected in parallel after being subjected to other instruments or protection, namely the current transformers can be shared), namely three-phase current and zero-sequence current. The problems that the interconnection switch has no zero sequence protection, the zero sequence protection is difficult to realize and the like exist at present.
The above is only for the purpose of assisting understanding of the technical solutions of the present invention, and does not represent an admission that the above is the prior art.
SUMMERY OF THE UTILITY MODEL
A main object of the utility model is to provide a zero sequence protection device and high-pressure station service protective equipment aims at solving prior art interconnection switch and does not have zero sequence protection, and zero sequence protection is difficult to the technical problem who realizes.
In order to achieve the above object, the utility model provides a zero sequence protection device, zero sequence protection device includes: the zero-sequence protection system comprises a first current transformer group, a second current transformer group, a first protection connecting sheet, a second protection connecting sheet and a generator-transformer group transformer, wherein the first current transformer group is connected with the generator-transformer group transformer through the first protection connecting sheet, and the second current transformer group is connected with the generator-transformer group transformer through the second protection connecting sheet; the zero sequence protection system of the interconnection switch comprises a first interconnection switch and a second interconnection switch; wherein the content of the first and second substances,
the zero sequence protection device is used for connecting the first current transformer group and the first interconnection switch when the first protection connecting piece is disconnected, and connecting the second current transformer group and the second interconnection switch when the second protection connecting piece is disconnected, so that zero sequence protection of the interconnection switch is realized.
Preferably, the zero-sequence protection system of the generator-transformer set further includes a first cable and a second cable, the generator-transformer set is a three-winding transformer, wherein a first secondary winding neutral point of the three-winding transformer is connected to the first current transformer set through the first cable, a second secondary winding neutral point of the three-winding transformer is connected to the second current transformer set through the second cable, and a primary winding of the three-winding transformer is connected to a high-voltage side of the high-voltage plant transformer.
Preferably, the first current transformer group includes a first current transformer, a second current transformer and a first resistor, wherein a first end of the first resistor is connected to the first secondary winding neutral point through the first cable, a second end of the first resistor is grounded through the first cable, the first current transformer is coupled to the first cable on the primary side, and the second current transformer is coupled to the first cable on the primary side;
the second current transformer group includes a third current transformer, a fourth current transformer and a second resistor, wherein a first end of the second resistor is connected to the neutral point of the second secondary winding through the second cable, a second end of the second resistor is grounded through the second cable, the third current transformer is coupled to the second cable on the primary side, and the fourth current transformer is coupled to the second cable on the primary side.
Preferably, the zero sequence protection device further includes a secondary circuit, and the secondary circuit includes a second current transformer secondary side, a fourth current transformer secondary side, a first interconnection switch and a second interconnection switch, wherein when the first protection connecting piece is disconnected, the second current transformer secondary side and the first interconnection switch are connected, and when the second protection connecting piece is disconnected, the fourth current transformer secondary side and the second interconnection switch are connected.
Preferably, the secondary circuit further includes a first terminal, a second terminal, a third terminal, and a first generator transformer set protection device, wherein a first end of the first terminal is connected to a first end of a secondary side of the second current transformer, a second end of the secondary side of the second current transformer is grounded, a second end of the first terminal is connected to the first generator transformer set protection device, a first end of the second terminal is connected to the first generator transformer set protection device, a second end of the second terminal is connected to a first end of the first interconnection switch, a second end of the first interconnection switch is connected to a first end of the third terminal, and a second end of the third terminal is grounded.
Preferably, the first generator transformer protection device set comprises a fourth terminal and a fifth terminal, the fourth terminal is connected with the second end of the first terminal, and the fifth terminal is connected with the first end of the second terminal; the fourth terminal and the fifth terminal are used for the first generator transformer complete set protection device to receive the zero sequence current of the secondary side of the second current transformer.
Preferably, the secondary circuit further includes a sixth terminal, a seventh terminal, an eighth terminal, and a second generator transformer set protection device, wherein a first end of the sixth terminal is connected to a first end of a secondary side of the fourth current transformer, a second end of the secondary side of the fourth current transformer is grounded, a second end of the sixth terminal is connected to the second generator transformer set protection device, a first end of the seventh terminal is connected to the second generator transformer set protection device, a second end of the seventh terminal is connected to a first end of the second interconnection switch, a second end of the second interconnection switch is connected to a first end of the eighth terminal, and a second end of the eighth terminal is grounded.
Preferably, the second generator transformer protection device set comprises a ninth terminal and a tenth terminal, the ninth terminal is connected with the second end of the sixth terminal, and the tenth terminal is connected with the first end of the seventh terminal; the ninth terminal and the tenth terminal are used for the second generator transformer complete set protection device to receive the zero sequence current of the secondary side of the fourth current transformer.
Preferably, the zero sequence protection device further comprises a setting system, and the setting system is used for setting a setting current and setting protection time delay.
Furthermore, in order to realize the above object, the utility model discloses still provide a high pressure service power protection equipment, high pressure service power protection equipment includes as above zero sequence protection device.
The utility model provides a zero sequence protection device and high pressure service protective equipment, zero sequence protection device includes: the zero-sequence protection system comprises a first current transformer group, a second current transformer group, a first protection connecting sheet, a second protection connecting sheet and a generator-transformer group transformer, wherein the first current transformer group is connected with the generator-transformer group transformer through the first protection connecting sheet, and the second current transformer group is connected with the generator-transformer group transformer through the second protection connecting sheet; the zero sequence protection system of the interconnection switch comprises a first interconnection switch and a second interconnection switch; the zero sequence protection device is used for connecting the first current transformer group with the first interconnection switch when the first protection connection piece is disconnected, and connecting the second current transformer group with the second interconnection switch when the second protection connection piece is disconnected, so that zero sequence protection of the interconnection switch is realized under the condition that equipment such as a current transformer is not added, the technical problems that the interconnection switch in the prior art has no zero sequence protection and is difficult to realize zero sequence protection are solved, and the safety and the reliability of the interconnection switch are improved.
Drawings
Fig. 1 is a functional block diagram of an embodiment of the zero sequence protection device of the present invention;
fig. 2 is a schematic structural diagram of an embodiment of the zero sequence protection device of the present invention;
fig. 3 is a circuit diagram of a secondary circuit of an embodiment of the zero sequence protection device of the present invention.
The reference numbers illustrate:
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
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 efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope of the present invention.
The utility model provides a zero sequence protection device.
Referring to fig. 1, fig. 1 is a functional block diagram of an embodiment of the zero sequence protection device of the present invention, in an embodiment of the present invention, the zero sequence protection device includes: the zero-sequence protection system 100 of the interconnection switch and the zero-sequence protection system 200 of the generator-transformer set, wherein the zero-sequence protection system 200 of the generator-transformer set comprises a first current transformer group 300, a second current transformer group 400, a first protection connecting sheet, a second protection connecting sheet and a generator-transformer set transformer T, the first current transformer group 300 is connected with the generator-transformer set transformer T through the first protection connecting sheet, and the second current transformer group 400 is connected with the generator-transformer set transformer T through the second protection connecting sheet; the tie switch zero sequence protection system 100 comprises a first tie switch K1 and a second tie switch K2; wherein the content of the first and second substances,
the zero sequence protection device is used for connecting the first current transformer group 300 and the first interconnection switch K1 when the first protection link is disconnected, and connecting the second current transformer group 400 and the second interconnection switch K2 when the second protection link is disconnected, so as to realize zero sequence protection of interconnection switches.
In this embodiment, the generator-transformer set is a device formed by a generator and a transformer, and is the most important core of a power plant, where the transformer includes a main transformer, a high-voltage station transformer, and the like, for example, the high-voltage station transformer used in a thermal power plant, and is one of main electrical devices of the power plant and the transformer substation, and is important for safe and stable operation of a power system, and once a fault occurs and is damaged, the maintenance difficulty is large, the time is long, and a great economic loss is caused; in addition, the sudden removal of the transformer after a fault can cause more or less disturbance to the power system. Therefore, the requirement for relay protection of the high-voltage station transformer is high. In this embodiment, a current transformer in the first current transformer group 300 and a current transformer in the second current transformer group 400 are taken to form a group of current transformers without adding any current transformers or other devices, a protection connecting piece from the group of current transformers to the generator-transformer group transformer T is opened, the first current transformer group 300 and the first interconnection switch K1 are connected, and the second current transformer group 400 and the second interconnection switch K2 are connected, so that zero-sequence protection of the interconnection switch is realized.
The utility model provides a zero sequence protection device, zero sequence protection device includes: the zero-sequence protection system 100 of the interconnection switch and the zero-sequence protection system 200 of the generator-transformer set, wherein the zero-sequence protection system 200 of the generator-transformer set comprises a first current transformer group 300, a second current transformer group 400, a first protection connecting sheet, a second protection connecting sheet and a generator-transformer set transformer T, the first current transformer group 300 is connected with the generator-transformer set transformer T through the first protection connecting sheet, and the second current transformer group 400 is connected with the generator-transformer set transformer T through the second protection connecting sheet; the tie switch zero sequence protection system 100 comprises a first tie switch K1 and a second tie switch K2; the zero sequence protection device is used for connecting the first current transformer group 300 and the first interconnection switch K1 when the first protection connecting piece is disconnected, and connecting the second current transformer group 400 and the second interconnection switch K2 when the second protection connecting piece is disconnected, so that zero sequence protection of the interconnection switch is realized under the condition that no additional current transformer and other equipment are added, the technical problems that the interconnection switch in the prior art has no zero sequence protection and the zero sequence protection is difficult to realize are solved, and the safety and the reliability of the interconnection switch are improved.
Referring to fig. 2, the generator-transformer-set zero-sequence protection system 200 further includes a first cable L1 and a second cable L2, the generator-transformer-set transformer T is a three-winding transformer, wherein a first secondary winding neutral point of the three-winding transformer is connected to the first current transformer group 300 through the first cable L1, a second secondary winding neutral point of the three-winding transformer is connected to the second current transformer group 400 through the second cable L2, and a primary winding of the three-winding transformer is connected to a high-voltage side of the high-voltage plant transformer.
In this embodiment, the first cable L1 connects the three-winding transformer with the first current transformer group 300, the second cable L2 connects the three-winding transformer with the second current transformer group 400, the first current transformer group 300 and the second current transformer group 400 can be neutral point grounding resistor cabinets, the neutral point of the three-winding transformer is grounded through a resistor, that is, a resistor is connected in series between the neutral point of the power grid and the ground, and the resistance value of the connected resistor is appropriately selected to discharge the energy of the half-wave of the single-phase grounding arc, thereby reducing the possibility of arc reignition, suppressing the amplitude of the overvoltage of the power grid, and effectively protecting the normal operation of the power system, and the connected resistor can be a neutral point grounding resistor cabinet or other resistors.
It should be noted that the generator transformer T may be a three-winding transformer or another type of transformer, which is not limited in this embodiment.
The first current transformer group 300 includes a first current transformer TA1, a second current transformer TA2 and a first resistor R1, wherein a first end of the first resistor R1 is connected to the first secondary winding neutral point through the first cable L1, a second end of the first resistor R1 is grounded through the first cable L1, the first current transformer TA1 is primarily coupled to the first cable L1, and the second current transformer TA2 is primarily coupled to the first cable L1;
the second current transformer group 400 includes a third current transformer TA3, a fourth current transformer TA4, and a second resistor R2, wherein a first end of the second resistor R2 is connected to the second secondary winding neutral point through the second cable L2, a second end of the second resistor R2 is grounded through the second cable L2, the third current transformer TA3 is primarily coupled to the second cable L2, and the fourth current transformer TA4 is primarily coupled to the second cable L2.
In this embodiment, the first current transformer group 300 includes a first current transformer TA1, a second current transformer TA2, and a first resistor R1, the second current transformer group 400 includes a third current transformer TA3, a fourth current transformer TA4, and a second resistor R2, the first current transformer group 300 and the second current transformer group 400 may be a neutral point grounding resistor cabinet, the neutral point grounding resistor cabinet may further be configured with other components besides the current transformers and the resistors, for example, the neutral point grounding resistor cabinet may further be configured with an action recorder, and the power system may monitor the neutral point unbalanced current when working normally; when single-phase earth faults occur, the action times can be recorded, and analog quantity output can be provided for a protection and monitoring system; the neutral point grounding resistance cabinet can be additionally provided with a special lightning arrester according to the requirement; and a measurement and control protection device and the like can be additionally arranged according to the user requirements. Those skilled in the art will appreciate that the configuration shown in fig. 2 does not constitute a limitation of the first current transformer group 300 and the second current transformer group 400, and may include more or less components than those shown, or some components in combination, or a different arrangement of components.
The primary side of the first current transformer TA1 is coupled to the first cable L1, the primary side of the second current transformer TA2 is coupled to the first cable L1, the primary side of the third current transformer TA3 is coupled to the second cable L2, the primary side of the fourth current transformer TA4 is coupled to the second cable L2, the first current transformer TA1, the second current transformer TA2, the third current transformer TA3 and the fourth current transformer TA4 can be zero-sequence current transformers, the zero-sequence current transformers are single-turn feed-through current transformers, when the zero-sequence current transformers are used, the primary sides of the zero-sequence current transformers are coupled to cables of a power system, the secondary side of the zero-sequence current transformers are connected to a relay device through leads, the output ends of the relay device are connected to a signal device or an alarm system, and when the power system generates zero-sequence ground current, the zero-sequence current transformers are matched with the relay device or the signal device to realize protection or monitoring.
Referring to fig. 3, the zero sequence protection device further includes a secondary circuit, and the secondary circuit includes a secondary side of a second current transformer TA2, a secondary side of a fourth current transformer TA4, a first tie switch K1, and a second tie switch K2, wherein when the first protection link is disconnected, the secondary side of the second current transformer TA2 is connected to the first tie switch K1, and when the second protection link is disconnected, the secondary side of the fourth current transformer TA4 is connected to the second tie switch K2.
In this embodiment, to implement the secondary circuit, safety measures need to be taken in advance, the main transformer and the high-voltage plant transformer are set in a power failure state, and if the main transformer and the high-voltage plant transformer cannot be in the power failure state, necessary safety measures need to be taken, for example, a branch zero sequence protection of the high-voltage plant transformer is withdrawn for a short time, measures for sealing the second current transformer TA2 and the fourth current transformer TA4 are taken in the protection A, B screen of the generator-transformer set transformer, so as to prevent the current transformer from being opened to cause tripping of a switch on the high-voltage side of the main transformer. Under the premise of the safety measure, the first protection connecting piece is disconnected, the secondary side of the second current transformer TA2 is connected with the first interconnection switch K1, the second protection connecting piece is disconnected, and the secondary side of the fourth current transformer TA4 is connected with the second interconnection switch K2.
Referring to fig. 3, the secondary circuit further includes a first terminal D1, a second terminal D2, a third terminal D3, and a first generator transformer set protection device 500, wherein a first end of the first terminal D1 is connected to a first end of a secondary side of the second current transformer TA2, a second end of a secondary side of the second current transformer TA2 is grounded, a second end of the first terminal D1 is connected to the first generator transformer set protection device 500, a first end of the second terminal D2 is connected to the first generator transformer set protection device 500, a second end of the second terminal D2 is connected to a first end of the first interconnection switch K1, a second end of the first interconnection switch K1 is connected to a first end of the third terminal D3, and a second end of the third terminal D3 is grounded.
Further, the first generator transformer protection device 500 includes a fourth terminal D4 and a fifth terminal D5, the fourth terminal D4 is connected to the second end of the first terminal D1, and the fifth terminal D5 is connected to the first end of the second terminal D2; the fourth terminal D4 and the fifth terminal D5 are used for the first generator transformer protection apparatus 500 to receive a zero sequence current on the secondary side of the second current transformer TA 2.
The secondary circuit further includes a sixth terminal D6, a seventh terminal D7, an eighth terminal D8, and a second generator transformer protection set 600, wherein a first end of the sixth terminal D6 is connected to a first end of a secondary side of the fourth current transformer TA4, a second end of a secondary side of the fourth current transformer TA4 is grounded, a second end of the sixth terminal D6 is connected to the second generator transformer protection set 600, a first end of the seventh terminal D7 is connected to the second generator transformer protection set 600, a second end of the seventh terminal D7 is connected to a first end of the second link switch K2, a second end of the second link switch K2 is connected to a first end of the eighth terminal D8, and a second end of the eighth terminal D8 is grounded.
Further, the second generator transformer protection device 600 includes a ninth terminal D9 and a tenth terminal D10, the ninth terminal D9 is connected to the second end of the sixth terminal D6, and the tenth terminal D10 is connected to the first end of the seventh terminal D7; the ninth terminal D9 and the tenth terminal D10 are used for the second generator transformer protection set 600 to receive the zero sequence current on the secondary side of the fourth current transformer TA 4.
In this embodiment, the secondary circuit further includes a first terminal D1, a second terminal D2, a third terminal D3, a fourth terminal D4, a fifth terminal D5, a sixth terminal D6, a seventh terminal D7, an eighth terminal D8, a ninth terminal D9, and a tenth terminal D10, where the terminals are terminals that mainly transmit electrical signals or conduct electricity. The first generator transformer complete set protection device 500 and the second generator transformer complete set protection device 600 may adopt a generator transformer complete set protection device manufactured by nanrui relay protection electric limited and having a model number of RCS-985BT, and for this embodiment, two sets of RCS-985BT protection devices may be provided, and two sets of RCS-985BT protection devices are connected to the secondary side of the second current transformer TA2 and the secondary side of the fourth current transformer TA4 respectively, with the current transformers of different sets being located at different branches as the second current transformer TA2 and the fourth current transformer TA4 in fig. 2.
It should be noted that the fourth terminal D4 and the fifth terminal D5 are configured to enable the first generator transformer complete set protection device 500 to receive the zero sequence current on the secondary side of the second current transformer TA2, the ninth terminal D9 and the tenth terminal D10 are configured to enable the second generator transformer complete set protection device 600 to receive the zero sequence current on the secondary side of the fourth current transformer TA4, for example, when in use, the secondary side of the second current transformer TA2 and the secondary side of the fourth current transformer TA4 are connected to the RCS-985BT protection device through leads and terminals, and then the output end of the RCS-985BT protection device is connected to a signal device or an alarm system, when the power system generates the zero sequence ground current, the secondary side of the second current transformer TA2 or the secondary side of the fourth current transformer TA4 outputs the zero sequence current, so that the connected RCS-985BT protection device generates a protection action, and the device is matched with a signal device for use to realize protection or monitoring.
Further, the zero sequence protection device further comprises a setting system, and the setting system is used for setting a setting current and setting protection time delay.
In this embodiment, the setting means that the electrical device must first test the magnitude of the normal operating current of the device before being put into normal operation, and whether the magnitude of the normal operating current is within the setting current range of the upper-level protection switch. Because the theoretical value of the electrical design and the operation value of the equipment have objective deviation, if the deviation is overlarge and exceeds the setting value, the action of the relay protection equipment is triggered, and the safety of personal equipment is protected.
For example, for a setting current I, the setting calculation formula is:
wherein 30A is the zero sequence current empirical value n in the interconnection switch zero sequence protection system 100TAFor the current transformer transformation ratio of the second current transformer TA2 and the fourth current transformer TA4 in the zero sequence protection system 200 of the generator-transformer group, the reliability coefficient can be 0.9 time, and the setting calculation formula can calculate the setting current I.
For example, for the setting protection delay, the zero-sequence protection action time limit of the tie switch zero-sequence protection system 100 is faster than the zero-sequence protection action time limit in the generator-transformer-group zero-sequence protection system 200 by one gradient and slower than the slowest time of the zero-sequence load of the feeder line by one gradient, if one time gradient is 0.3s, if the slowest time of the zero-sequence load of the feeder line is 0.4s, the zero-sequence protection action time limit of the tie switch zero-sequence protection system 100 is 0.7s, and the zero-sequence protection action time limit in the generator-transformer-group zero-sequence protection system 200 is 1 s. The time limit can be adjusted according to actual conditions, which is not limited in this embodiment.
The utility model also provides a high pressure service protective equipment, this high pressure service protective equipment includes as above zero sequence protection device, this zero sequence protection device's concrete structure refers to above-mentioned embodiment, because this high pressure service protective equipment has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and it is here no longer repeated one by one.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in the specific application, those skilled in the art can set the solution as required, and the present invention is not limited thereto.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings or directly or indirectly applied to other related technical fields are included in the protection scope of the present invention.

Claims (10)

1. A zero sequence protection device, characterized in that the zero sequence protection device comprises: the zero-sequence protection system comprises a first current transformer group, a second current transformer group, a first protection connecting sheet, a second protection connecting sheet and a generator-transformer group transformer, wherein the first current transformer group is connected with the generator-transformer group transformer through the first protection connecting sheet, and the second current transformer group is connected with the generator-transformer group transformer through the second protection connecting sheet; the zero sequence protection system of the interconnection switch comprises a first interconnection switch and a second interconnection switch; wherein the content of the first and second substances,
the zero sequence protection device is used for connecting the first current transformer group and the first interconnection switch when the first protection connecting piece is disconnected, and connecting the second current transformer group and the second interconnection switch when the second protection connecting piece is disconnected, so that zero sequence protection of the interconnection switch is realized.
2. The zero sequence protection device of claim 1, wherein the generator-transformer set zero sequence protection system further comprises a first cable and a second cable, and the generator-transformer set is a three-winding transformer, wherein a first secondary winding neutral point of the three-winding transformer is connected to the first current transformer set through the first cable, a second secondary winding neutral point of the three-winding transformer is connected to the second current transformer set through the second cable, and a primary winding of the three-winding transformer is connected to a high-voltage side of a high-voltage plant transformer.
3. The zero sequence protection device of claim 2, wherein the first current transformer set comprises a first current transformer, a second current transformer, and a first resistor, wherein a first end of the first resistor is connected to the first secondary winding neutral point through the first cable, a second end of the first resistor is grounded through the first cable, the first current transformer is primary-side coupled to the first cable, and the second current transformer is primary-side coupled to the first cable;
the second current transformer group includes a third current transformer, a fourth current transformer and a second resistor, wherein a first end of the second resistor is connected to the neutral point of the second secondary winding through the second cable, a second end of the second resistor is grounded through the second cable, the third current transformer is coupled to the second cable on the primary side, and the fourth current transformer is coupled to the second cable on the primary side.
4. The zero sequence protection device of claim 1, further comprising a secondary loop including a second current transformer secondary side, a fourth current transformer secondary side, a first tie switch and a second tie switch, wherein the second current transformer secondary side is connected to the first tie switch when the first protection link is open, and the fourth current transformer secondary side is connected to the second tie switch when the second protection link is open.
5. The zero sequence protection device of claim 4, wherein the secondary circuit further comprises a first terminal, a second terminal, a third terminal, and a first generator transformer protection set, wherein a first end of the first terminal is connected to a first end of a secondary side of the second current transformer, a second end of the secondary side of the second current transformer is grounded, a second end of the first terminal is connected to the first generator transformer protection set, a first end of the second terminal is connected to the first generator transformer protection set, a second end of the second terminal is connected to a first end of the first interconnection switch, a second end of the first interconnection switch is connected to a first end of the third terminal, and a second end of the third terminal is grounded.
6. The zero sequence protection device of claim 5, wherein the first generator transformer protection kit comprises a fourth terminal and a fifth terminal, the fourth terminal is connected to the second end of the first terminal, and the fifth terminal is connected to the first end of the second terminal; the fourth terminal and the fifth terminal are used for the first generator transformer complete set protection device to receive the zero sequence current of the secondary side of the second current transformer.
7. The zero sequence protection device of claim 4, wherein the secondary circuit further comprises a sixth terminal, a seventh terminal, an eighth terminal, and a second generator transformer set protection device, wherein a first end of the sixth terminal is connected to a first end of a secondary side of the fourth current transformer, a second end of the secondary side of the fourth current transformer is grounded, a second end of the sixth terminal is connected to the second generator transformer set protection device, a first end of the seventh terminal is connected to the second generator transformer set protection device, a second end of the seventh terminal is connected to a first end of the second connection switch, a second end of the second connection switch is connected to a first end of the eighth terminal, and a second end of the eighth terminal is grounded.
8. The zero sequence protection device of claim 7, wherein the second generator transformer plant protection device comprises a ninth terminal and a tenth terminal, the ninth terminal is connected with the second end of the sixth terminal, and the tenth terminal is connected with the first end of the seventh terminal; the ninth terminal and the tenth terminal are used for the second generator transformer complete set protection device to receive the zero sequence current of the secondary side of the fourth current transformer.
9. The zero sequence protection arrangement of claim 1, further comprising a setting system for setting a setting current and setting a protection time delay.
10. A high voltage service protection device, characterized in that it comprises a zero sequence protection arrangement according to any of claims 1-9.
CN201922229751.1U 2019-12-12 2019-12-12 Zero sequence protection device and high-voltage station service protection equipment Active CN211209287U (en)

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CN211209287U true CN211209287U (en) 2020-08-07

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