CN220042998U - Active filter transformation application circuit of multiple groups of current transformers with different transformation ratios - Google Patents
Active filter transformation application circuit of multiple groups of current transformers with different transformation ratios Download PDFInfo
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Abstract
The utility model provides an application circuit for modifying an active filter of a plurality of groups of current transformers with different transformation ratios, which relates to the technical field of active filters of low-voltage switch cabinets, and comprises a wire inlet cabinet sampling current transformer CT1, a capacitor cabinet sampling current transformer CT2, an active filter cabinet body sampling current transformer CT4, a wire inlet cabinet ammeter A1 and a capacitor cabinet ammeter A4, and also comprises an active filter cabinet conversion current transformer CT3 and an active filter internal circuit; the wire inlet cabinet sampling current transformer CT1 is connected with the wire inlet cabinet ammeter A1 in series, the wire inlet cabinet sampling current transformer CT1 is connected with an active filter internal circuit through a wiring terminal row, the capacitor cabinet sampling current transformer CT2 is connected with the capacitor cabinet ammeter A4 in series, the capacitor cabinet sampling current transformer CT2 and the capacitor cabinet ammeter A4 are connected with the active filter cabinet conversion current transformer CT3 through the wiring terminal row, and the active filter can be applied to various early low-voltage distribution systems.
Description
Technical Field
The utility model relates to the technical field of active filters of low-voltage switch cabinets, in particular to an application circuit for modifying active filters of multiple groups of current transformers with different transformation ratios.
Background
In the low-voltage distribution room of a telecommunication room, in early construction, redundant current transformer positions are not reserved in an incoming cabinet and a capacitor cabinet, and if harmonic quantity of other load cabinets is increased rapidly in the later stage, an active filter is required to be configured in the telecommunication room.
The working principle of the active filter is that the sampling current flowing into the load cabinet is required to be purified, the current sampled by the circuit transformer of the incoming line cabinet represents the total sampling current of the active filter, and the current sampled by the current transformer of the capacitor cabinet and the body sampling current of the active filter cabinet arranged at the tail end of the low-voltage system are required to be subtracted. The active filter can only utilize the current transformers on the original meter of the incoming line cabinet and the capacitor cabinet, basically the transformation ratio of the current transformers on the meter of the capacitor cabinet is different from that of the original meter of the incoming line cabinet, so that a new group of current transformers for conversion are needed.
Therefore, the utility model designs an active filter transformation application circuit of a plurality of groups of current transformers with different transformation ratios, realizes that the active filter can be applied to various early low-voltage distribution systems, has excellent sampling precision, thereby accurately controlling the harmonic waves of the power grid and also taking account of module protection, convenient maintenance and personal safety.
Disclosure of Invention
Aiming at the defects existing in the prior art, the utility model aims to provide an active filter transformation application circuit of a plurality of groups of current transformers with different transformation ratios, which comprises the following specific schemes:
the active filter transformation application circuit comprises an incoming line cabinet sampling current transformer CT1, a capacitor cabinet sampling current transformer CT2, an active filter cabinet body sampling current transformer CT4, an incoming line cabinet ammeter A1 and a capacitor cabinet ammeter A4 in the low-voltage distribution room, and also comprises an active filter cabinet transformation current transformer CT3 and an active filter internal circuit;
the wire inlet cabinet sampling current transformer CT1 is connected with the wire inlet cabinet ammeter A1 in series, and the wire inlet cabinet sampling current transformer CT1 is connected with the internal circuit of the active filter through a wiring terminal row I;
the capacitor cabinet sampling current transformer CT2 is connected with the capacitor cabinet ammeter A4 in series, the capacitor cabinet sampling current transformer CT2 and the capacitor cabinet ammeter A4 are connected with the active filter cabinet conversion current transformer CT3 through a wiring terminal row, and the active filter cabinet conversion current transformer CT3 is connected with the source filter cabinet body sampling current transformer CT4, the incoming line cabinet ammeter A1 and an active filter internal circuit through a wiring terminal row;
the internal circuit of the active filter comprises a plurality of active filter modules which are connected with each other through wiring terminal rows, and each active filter module can realize short circuit by arranging a miniature circuit breaker.
Further, the S1 and S2 ends of the current transformer CT1, the capacitor cabinet sampling current transformer CT2, the active filter cabinet conversion current transformer CT3 and the active filter cabinet body sampling current transformer CT4 are respectively provided with a switch bridge piece.
Further, the incoming line cabinet sampling current transformer CT1 is connected with the phase A secondary side, CT1-A-S1 is connected with the incoming line cabinet ammeter A1 and CT1-A-S2, and the incoming line cabinet sampling current transformer CT1 is connected with the terminal block TB7-10 and then goes to the internal circuit of the active filter module;
the capacitor box sampling current transformer CT2 is connected with the capacitor box ammeter A4 at the phase A secondary side, the capacitor box ammeter A4 rear terminal block TB7-30 is connected with the active filter cabinet conversion current transformer CT3-A-P1, and the CT2-A-S2 is connected with the active filter cabinet conversion current transformer CT3-A-P2 after being connected with the terminal block TB 7-31;
the active filter cabinet conversion current transformer CT3-A-S1 is connected with the active filter cabinet body sampling current transformer CT4-A-S1 after being connected with the terminal blocks TB7-10 and TB7-14 after being connected with the terminal blocks TB7-11, and the active filter cabinet conversion current transformer CT3-A-S2 is connected with the terminal blocks TB7-12, TB7-9 and TB7-13 and then is respectively led into the line cabinet ammeter A1, the active filter cabinet body sampling current transformer CT4-A-S2 and the internal circuit of the active filter module;
the current transformer CT1, the capacitor cabinet sampling current transformer CT2, the active filter cabinet conversion current transformer CT3 and the active filter cabinet body sampling current transformer CT4 are identical in phase B and phase C and phase A.
Further, the internal circuit of the active filter MODULE specifically includes an active filter MODULE1, an active filter MODULE2, an active filter MODULE3, a micro-breaker CB4, a micro-breaker CB5, and a micro-breaker CB6, where the micro-breaker CB4, the micro-breaker CB5, and the micro-breaker CB6 are respectively provided with an auxiliary contact AX1, an auxiliary contact AX2, and an auxiliary contact AX3;
the active filter MODULEs MODULE1, MODULE2 and MODULE3 are respectively provided with two, the two active filter MODULEs MODULE1 are respectively connected with the miniature circuit breaker CB4 through terminal bars TB1-1 to 2 and terminal bars TB1-3 to 4, the two active filter MODULEs MODULE2 are respectively connected with the miniature circuit breaker CB5 through terminal bars TB1-7 to 8 and terminal bars TB1-5 to 6, and the two active filter MODULEs MODULE3 are respectively connected with the miniature circuit breaker CB6 through terminal bars TB1-11 to 12 and terminal bars TB1-9 to 10;
the terminal bars TB 1-3-4 are connected with the terminal bars TB 1-5-6, the terminal bars TB 1-7-8 are connected with the terminal bars TB 1-9-10, the terminal bars TB 1-11-12 are connected with the terminal bars TB1-25, and the terminal bars TB1-25 are connected with the terminal bars TB 7-10.
Further, the transformation ratio of the sampling current transformer CT1 of the incoming line cabinet is 4000:5, the transformation ratio of the sampling current transformer CT2 of the capacitor cabinet is 300:5, and the transformation ratio of the conversion current transformer CT3 of the active filter cabinet is 66.67:5.
Further, the active filter cabinet converts a current transformer CT3, and adopts 3 DH-0.66-M10,66.67/5,0.2 stages and 10VA;
the active filter cabinet body samples the current transformer CT4, adopts 3 DH-0.66-100I,4000/5,0.2 level, 10VA;
active filter MODULE1, active filter MODULE2 and active filter MODULE3 are 3 Smart-F50-400-4L/M CNT01-28 connectors;
the miniature circuit breaker CB4, the miniature circuit breaker CB5 and the miniature circuit breaker CB6 adopt 3 iC65N-D63A/3P models;
auxiliary contacts AX1, AX2, AX3 are 9a26924;
the first connecting terminal block is set as a TB7 terminal block, adopts 35 URTK/S types, and is provided with a plurality of shorting blocks EB2-8 and switch bridging pieces SB 2-RTK/S.
Further, the primary side of the incoming line cabinet sampling current transformer CT1, CT1-P2 are located at the upper end of the incoming line cabinet; the primary side of the capacitor box sampling current transformer CT2, CT2-P2 is positioned at the upper end of the capacitor box; the active filter cabinet body samples the primary side of the current transformer CT4, and CT4-P2 is positioned at the upper end of the active filter cabinet.
Compared with the prior art, the utility model has the following beneficial effects:
(1) In various low-voltage distribution systems, when a plurality of groups of current transformers with different transformation ratios are utilized, an active filter cabinet transformation current transformer CT3 is added, and specifically, the transformation ratio required by an active filter is transformed into the transformation ratio required by the active filter through the transformation current transformer CT3 installed in the active filter cabinet, and the application of the active filter in various early low-voltage distribution systems is realized by combining an internal circuit of the active filter. According to the actual low-voltage distribution system condition, the current which flows into the load cabinet in a net manner is required by the active filter, namely, the current which flows into the load cabinet in a net manner and is required to be sampled by the active filter is a line inlet cabinet sampling current transformer CT1 connected with a line inlet cabinet ammeter A1 in series, the active filter cabinet conversion current transformer CT3 is subtracted by the capacitor cabinet sampling current transformer CT2 connected with a capacitor cabinet ammeter A4 in series, and the active filter cabinet body sampling current transformer CT4 is subtracted. In summary, the circuit is applied to a low-voltage distribution system, so that the sampling precision is improved, and the harmonic wave can be accurately managed.
(2) In the internal circuit of the active filter, the miniature circuit breaker is used for matching with the auxiliary contact, when a certain active filter module fails, the module power supply is disconnected after the circuit breaker is disconnected, the secondary circuit of the current transformer is shorted through the miniature auxiliary contact, the failed active filter module can be pulled out, the active filter module is completely protected, the active filter module is convenient to maintain, and the personal safety problem during maintenance is avoided.
(3) The special current transformer terminal is adopted, the terminal strip connection is optimized according to the secondary side schematic diagram, the sampling precision and the condition of burning out the module are influenced by wiring errors and the like, the left side of the terminal strip is connected with the S1 and the S2 of the current transformer, the right side is an internal wiring, a plurality of short circuit rows are adopted, and long cables are avoided, so that the sampling precision is improved, and the S1 and the S2 ends of the current transformer adopt a plurality of switch bridging pieces, so that the overhaul and the maintenance are facilitated.
Drawings
FIG. 1 is a simplified schematic diagram of a low voltage power distribution system of the present utility model;
FIG. 2 is a schematic diagram of the secondary side of the present utility model;
fig. 3 is a wiring diagram of the secondary side of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to examples and drawings, but embodiments of the present utility model are not limited thereto.
In the prior art, in a low-voltage distribution room of a telecommunication room, aiming at the situation that an active filter is required to be configured in the telecommunication room during later transformation, the utility model provides an application circuit for transforming the active filters of a plurality of groups of current transformers with different transformation ratios, which comprises a wire inlet cabinet sampling current transformer CT1, a capacitor cabinet sampling current transformer CT2, an active filter cabinet conversion current transformer CT3, an active filter cabinet body sampling current transformer CT4, an active filter internal circuit, a wire inlet cabinet ammeter A1 and a capacitor cabinet ammeter A4. Based on the working principle of the active filter, the current which flows into the active filter of the load cabinet in a net way and needs to be sampled is a line incoming cabinet sampling current transformer CT1, a line incoming cabinet ammeter A1 is connected in series, a capacitor cabinet sampling current transformer CT2 is connected in series with a capacitor cabinet ammeter A4, an active filter cabinet conversion current transformer CT3 is subtracted, an active filter cabinet body sampling current transformer CT4 is subtracted, and the active filter can be applied to various early low-voltage distribution systems through cooperation between the active filter and the capacitor cabinet sampling current transformer CT1, and excellent sampling precision is achieved, so that power grid harmonic waves are accurately managed, and module protection, convenience in maintenance and personal safety are also considered.
In the above circuit, the wire inlet cabinet sampling current transformer CT1, the capacitor cabinet sampling current transformer CT2, the wire inlet cabinet ammeter A1 and the capacitor cabinet ammeter A4 are all original structures of the equipment, the active filter cabinet conversion current transformer CT3, the active filter cabinet body sampling current transformer CT4 and the active filter internal circuit adopt commercial structures or are composed of commercial structures, and are assembled with the original structures of the equipment.
The transformation ratio of the sampling current transformer CT1 of the incoming line cabinet is 4000:5, the transformation ratio of the sampling current transformer CT2 of the capacitor cabinet is 300:5, the transformation ratio of the sampling current transformer CT4 of the active filter cabinet body is 4000:5, and according to the use principle of the sampling current transformer CT4 of the active filter, a group of new current transformers needs to be added into the capacitor cabinet, namely 4000:5, but due to the limitation of field conditions, the incoming line cabinet and the capacitor cabinet cannot be added with new current transformers, only the current transformers of the original meter can be utilized, but the transformation ratios of the current transformers are different, so that the current sampling precision of the active filter is affected.
In contrast, the utility model adds a group of active filter cabinet conversion current transformers CT3 in the active filter cabinet, the transformation ratio is 66.67:5 (according to the transformation ratio of the primary side of the incoming cabinet CT1 divided by the transformation ratio of the primary side of the capacitor cabinet CT 2), and the current transformers CT1 of the original incoming cabinet ammeter A1 and the current transformers CT2 of the capacitor cabinet ammeter A4 are utilized, so that the active filter cabinet conversion current transformers CT3 are matched with a plurality of groups of current transformers with different transformation ratios, the sampling precision is improved, and the harmonic wave can be accurately managed.
Specifically, as shown in fig. 1, the incoming line cabinet, the load cabinet, the capacitor cabinet, the load cabinet and the active filter cabinet (APF cabinet) are sequentially arranged at intervals, the incoming line cabinet samples the primary side of the current transformer CT1, the CT1-P2 is located at the upper end of the incoming line cabinet, the capacitor cabinet samples the primary side of the current transformer CT2, the CT2-P2 is located at the upper end of the capacitor cabinet, the active filter cabinet body samples the primary side of the current transformer CT4, and the CT4-P2 is located at the upper end of the active filter cabinet. The connection relation among the units in the circuit is as follows: the wire inlet cabinet sampling current transformer CT1 is connected with the wire inlet cabinet ammeter A1 in series, and the wire inlet cabinet sampling current transformer CT1 is connected with an internal circuit of the active filter through a wiring terminal block; the capacitive cabinet sampling current transformer CT2 is connected with the capacitive cabinet ammeter A4 in series, the capacitive cabinet sampling current transformer CT2 and the capacitive cabinet ammeter A4 are connected with the active filter cabinet conversion current transformer CT3 through the wiring terminal row, and the active filter cabinet conversion current transformer CT3 is connected with the source filter cabinet body sampling current transformer CT4, the incoming line cabinet ammeter A1 and an active filter internal circuit through the wiring terminal row.
As shown in fig. 2, the sampling current transformer CT1 of the incoming line cabinet has an a-phase secondary side, and the CT1-a-S1 is connected to the current meter A1 of the incoming line cabinet and the CT1-a-S2 is connected to the terminal block TB7-10 and then goes to the internal circuit of the active filter module;
the capacitor box sampling current transformer CT2 is connected with the capacitor box ammeter A4 at the phase A secondary side, the capacitor box ammeter A4 rear terminal block TB7-30 is connected with the active filter cabinet conversion current transformer CT3-A-P1, and the CT2-A-S2 is connected with the active filter cabinet conversion current transformer CT3-A-P2 after being connected with the terminal block TB 7-31;
the active filter cabinet conversion current transformer CT3-A-S1 is connected with the active filter cabinet body sampling current transformer CT4-A-S1 after being connected with the terminal blocks TB7-10 and TB7-14 after being connected with the terminal blocks TB7-11, and the active filter cabinet conversion current transformer CT3-A-S2 is connected with the terminal blocks TB7-12, TB7-9 and TB7-13 and then is respectively led into the line cabinet ammeter A1, the active filter cabinet body sampling current transformer CT4-A-S2 and the internal circuit of the active filter module;
the current transformer CT1, the capacitor cabinet sampling current transformer CT2, the active filter cabinet conversion current transformer CT3 and the active filter cabinet body sampling current transformer CT4 are identical in phase B and phase C and phase A.
The wiring terminals of the current transformers with different transformation ratios are arranged in a row, so that the optimization is required according to a secondary side schematic diagram, the wiring is considered to be clear, long wires and the like are avoided, and the conditions that sampling precision and a burning module are affected due to wiring errors and the like are avoided. In this regard, as shown in fig. 3, in this embodiment, the first terminal block is set as a TB7 terminal block, and 35 URTK/S are used, and a plurality of shorting blocks EB2-8 and switching bridge pieces SB 2-RTK/S are configured. The TB7 terminal block is a current transformer terminal block of the active filter cabinet, all terminals on the secondary sides of CT1, CT2, CT3 and CT4 are connected with the terminal block, connection of the terminal block is optimized according to a secondary side schematic diagram, the left side of the terminal block is connected with S1 and S2 of the current transformer for avoiding the conditions of influencing sampling precision and burning out modules due to wiring errors and the like, the right side of the terminal block is an internal connection, a plurality of shorting blocks EB2-8 are adopted, long cables are avoided, and accordingly sampling precision is improved. The current transformer CT1, the capacitor cabinet sampling current transformer CT2, the active filter cabinet conversion current transformer CT3 and the S1 and S2 ends of the active filter cabinet body sampling current transformer CT4 are respectively provided with a switch bridge SB 2-RTK/S, so that the overhaul and maintenance are facilitated.
Next, as shown in fig. 2, the internal circuit of the active filter includes a plurality of active filter modules connected to each other by a connection terminal row two, and each active filter module can be shorted by setting a miniature circuit breaker. The internal circuit of the active filter MODULE specifically comprises an active filter MODULE1, an active filter MODULE2, an active filter MODULE3, a micro-breaker CB4, a micro-breaker CB5 and a micro-breaker CB6, wherein the micro-breaker CB4, the micro-breaker CB5 and the micro-breaker CB6 are respectively provided with an auxiliary contact AX1, an auxiliary contact AX2 and an auxiliary contact AX3;
the active filter MODULEs MODULE1, MODULE2 and MODULE3 are respectively provided with two, the two active filter MODULEs MODULE1 are respectively connected with the miniature circuit breaker CB4 through terminal bars TB1-1 to 2 and terminal bars TB1-3 to 4, the two active filter MODULEs MODULE2 are respectively connected with the miniature circuit breaker CB5 through terminal bars TB1-7 to 8 and terminal bars TB1-5 to 6, and the two active filter MODULEs MODULE3 are respectively connected with the miniature circuit breaker CB6 through terminal bars TB1-11 to 12 and terminal bars TB1-9 to 10;
the terminal bars TB 1-3-4 are connected with the terminal bars TB 1-5-6, the terminal bars TB 1-7-8 are connected with the terminal bars TB 1-9-10, the terminal bars TB 1-11-12 are connected with the terminal bars TB1-25, and the terminal bars TB1-25 are connected with the terminal bars TB 7-10.
It should be noted that, the second connection terminal is similar to the first connection terminal, the micro breaker is used to match with an auxiliary contact in the internal circuit of the active filter, when the active filter MODULE1, the active filter MODULE2 or the active filter MODULE3 fails, the MODULE power is disconnected after the breaker is disconnected, and the secondary circuit of the current transformer is shorted through the micro breaking auxiliary contact, so that the failed active filter MODULE can be pulled out, thereby protecting the MODULE and personal safety.
In addition, in this example, the specific types commercially available are as follows:
the active filter cabinet converts the current transformer CT3, adopts 3 DH-0.66-M10,66.67/5,0.2 stages and 10VA;
the active filter cabinet body samples the current transformer CT4, adopts 3 DH-0.66-100I,4000/5,0.2 level, 10VA;
active filter MODULE1, active filter MODULE2 and active filter MODULE3 are 3 Smart-F50-400-4L/M CNT01-28 connectors;
the miniature circuit breaker CB4, the miniature circuit breaker CB5 and the miniature circuit breaker CB6 adopt 3 iC65N-D63A/3P models;
auxiliary contacts AX1, AX2, AX3 are 9a26924;
the first wiring terminal row is set as a TB7 terminal row, the model number is 35 URTK/S, a plurality of short circuit rows EB2-8 and switch bridging pieces SB 2-RTK/S are configured, the short circuit rows EB2-8 are plug-in bridging pieces, and the switch bridging pieces SB 2-RTK/S are non-short circuit rows.
In summary, the working procedure of the utility model is as follows:
in the original low-voltage distribution system, when harmonic quantity of a load cabinet increases suddenly to influence a distribution power grid, an active filter is needed to treat, as the wire inlet cabinet and the capacitor cabinet have no redundant installation space for current transformers, the active filter can only utilize the current transformers with different transformation ratios of the wire inlet cabinet and the capacitor cabinet meter, the current transformers are arranged in the active filter cabinet and are converted into transformation ratios needed by the active filter, according to the actual low-voltage distribution system condition, the active filter needs to net current flowing into the load cabinet, the directions P1 and P2 of the primary sides of the current transformers are consistent, the secondary sides of the current transformers are utilized to make corresponding subtraction, the sampling current flowing into the capacitor cabinet and the sampling current flowing into the active filter at the tail end of the system are subtracted, and the original meter of the wire inlet cabinet and the capacitor cabinet meter still need to be used, so that the whole secondary side principle still needs to connect the meter of the wire inlet cabinet and the capacitor cabinet in series.
The secondary side current transformer part is used for an internal circuit of the active filter module, a miniature circuit breaker is used for configuring an auxiliary contact, when the active filter module fails, a module power supply can be disconnected after the circuit breaker is disconnected, the secondary circuit of the current transformer is short-circuited through the miniature auxiliary contact, and the failed active filter module can be pulled out, so that the module and personal safety are protected. If an active filter module is needed to be added in the later field, only the module is needed to be added, additional wiring and the like are not needed, and the expandability is good.
The above description is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that modifications and adaptations to the present utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.
Claims (7)
1. The active filter transformation application circuit is used for a low-voltage distribution room and comprises an incoming line cabinet sampling current transformer CT1, a capacitor cabinet sampling current transformer CT2, an active filter cabinet body sampling current transformer CT4, an incoming line cabinet ammeter A1 and a capacitor cabinet ammeter A4 in the low-voltage distribution room, and is characterized by further comprising an active filter cabinet transformation current transformer CT3 and an active filter internal circuit;
the wire inlet cabinet sampling current transformer CT1 is connected with the wire inlet cabinet ammeter A1 in series, and the wire inlet cabinet sampling current transformer CT1 is connected with the internal circuit of the active filter through a wiring terminal row I;
the capacitor cabinet sampling current transformer CT2 is connected with the capacitor cabinet ammeter A4 in series, the capacitor cabinet sampling current transformer CT2 and the capacitor cabinet ammeter A4 are connected with the active filter cabinet conversion current transformer CT3 through a wiring terminal row, and the active filter cabinet conversion current transformer CT3 is connected with the source filter cabinet body sampling current transformer CT4, the incoming line cabinet ammeter A1 and an active filter internal circuit through a wiring terminal row;
the internal circuit of the active filter comprises a plurality of active filter modules which are connected with each other through wiring terminal rows, and each active filter module can realize short circuit by arranging a miniature circuit breaker.
2. The application circuit for modifying the active filters of the multiple groups of current transformers with different transformation ratios according to claim 1, wherein the S1 and S2 ends of the current transformer CT1, the capacitor box sampling current transformer CT2, the active filter box transformation current transformer CT3 and the active filter box body sampling current transformer CT4 are respectively provided with a switch bridge piece.
3. The application circuit for modifying the active filters of the multiple groups of current transformers with different transformation ratios according to claim 2, wherein the incoming line cabinet sampling current transformer CT1 is connected with an A-phase secondary side, CT1-A-S1 is connected with an incoming line cabinet ammeter A1 and CT1-A-S2 is connected with a terminal block TB7-10 and then goes to an internal circuit of the active filter module;
the capacitor box sampling current transformer CT2 is connected with the capacitor box ammeter A4 at the phase A secondary side, the capacitor box ammeter A4 rear terminal block TB7-30 is connected with the active filter cabinet conversion current transformer CT3-A-P1, and the CT2-A-S2 is connected with the active filter cabinet conversion current transformer CT3-A-P2 after being connected with the terminal block TB 7-31;
the active filter cabinet conversion current transformer CT3-A-S1 is connected with the active filter cabinet body sampling current transformer CT4-A-S1 after being connected with the terminal blocks TB7-10 and TB7-14 after being connected with the terminal blocks TB7-11, and the active filter cabinet conversion current transformer CT3-A-S2 is connected with the terminal blocks TB7-12, TB7-9 and TB7-13 and then is respectively led into the line cabinet ammeter A1, the active filter cabinet body sampling current transformer CT4-A-S2 and the internal circuit of the active filter module;
the current transformer CT1, the capacitor cabinet sampling current transformer CT2, the active filter cabinet conversion current transformer CT3 and the active filter cabinet body sampling current transformer CT4 are identical in phase B and phase C and phase A.
4. The application circuit for modifying an active filter of a plurality of groups of current transformers with different transformation ratios according to claim 3, wherein the internal circuit of the active filter MODULE specifically comprises an active filter MODULE1, an active filter MODULE2, an active filter MODULE3, a micro-breaker CB4, a micro-breaker CB5 and a micro-breaker CB6, and the micro-breaker CB4, the micro-breaker CB5 and the micro-breaker CB6 are respectively provided with an auxiliary contact AX1, an auxiliary contact AX2 and an auxiliary contact AX3;
the active filter MODULEs MODULE1, MODULE2 and MODULE3 are respectively provided with two, the two active filter MODULEs MODULE1 are respectively connected with the miniature circuit breaker CB4 through terminal bars TB1-1 to 2 and terminal bars TB1-3 to 4, the two active filter MODULEs MODULE2 are respectively connected with the miniature circuit breaker CB5 through terminal bars TB1-7 to 8 and terminal bars TB1-5 to 6, and the two active filter MODULEs MODULE3 are respectively connected with the miniature circuit breaker CB6 through terminal bars TB1-11 to 12 and terminal bars TB1-9 to 10;
the terminal bars TB 1-3-4 are connected with the terminal bars TB 1-5-6, the terminal bars TB 1-7-8 are connected with the terminal bars TB 1-9-10, the terminal bars TB 1-11-12 are connected with the terminal bars TB1-25, and the terminal bars TB1-25 are connected with the terminal bars TB 7-10.
5. The application circuit for modifying active filters of multiple groups of current transformers with different transformation ratios according to claim 1, wherein the transformation ratio of the incoming line cabinet sampling current transformer CT1 is 4000:5, the transformation ratio of the capacitor cabinet sampling current transformer CT2 is 300:5, and the transformation ratio of the active filter cabinet conversion current transformer CT3 is 66.67:5.
6. The application circuit for modifying the active filters of the multiple groups of current transformers with different transformation ratios according to claim 5, wherein the active filter cabinet converts the current transformer CT3 by adopting 3 DH-0.66-M10,66.67/5,0.2 stages and 10VA;
the active filter cabinet body samples the current transformer CT4, adopts 3 DH-0.66-100I,4000/5,0.2 level, 10VA;
active filter MODULE1, active filter MODULE2 and active filter MODULE3 are 3 Smart-F50-400-4L/M CNT01-28 connectors;
the miniature circuit breaker CB4, the miniature circuit breaker CB5 and the miniature circuit breaker CB6 adopt 3 iC65N-D63A/3P models;
auxiliary contacts AX1, AX2, AX3 are 9a26924;
the first connecting terminal block is set as a TB7 terminal block, adopts 35 URTK/S types, and is provided with a plurality of shorting blocks EB2-8 and switch bridging pieces SB 2-RTK/S.
7. The application circuit for modifying the active filters of the multiple groups of current transformers with different transformation ratios according to claim 6, wherein the incoming line cabinet samples the primary side of the current transformer CT1, and CT1-P2 are positioned at the upper end of the incoming line cabinet; the primary side of the capacitor box sampling current transformer CT2, CT2-P2 is positioned at the upper end of the capacitor box; the active filter cabinet body samples the primary side of the current transformer CT4, and CT4-P2 is positioned at the upper end of the active filter cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321532051.XU CN220042998U (en) | 2023-06-15 | 2023-06-15 | Active filter transformation application circuit of multiple groups of current transformers with different transformation ratios |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321532051.XU CN220042998U (en) | 2023-06-15 | 2023-06-15 | Active filter transformation application circuit of multiple groups of current transformers with different transformation ratios |
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| Publication Number | Publication Date |
|---|---|
| CN220042998U true CN220042998U (en) | 2023-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321532051.XU Active CN220042998U (en) | 2023-06-15 | 2023-06-15 | Active filter transformation application circuit of multiple groups of current transformers with different transformation ratios |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220042998U (en) |
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2023
- 2023-06-15 CN CN202321532051.XU patent/CN220042998U/en active Active
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