CN103500990A - Selection method of buscouple CT (current transformer) winding in optimized busbar differential protection devices - Google Patents
Selection method of buscouple CT (current transformer) winding in optimized busbar differential protection devices Download PDFInfo
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Abstract
The invention relates to a selection method of a buscouple CT (current transformer) winding in optimized busbar differential protection devices. The selection method comprises stages such as busbar differential protection device classification, connection scheme determination, 220-4 bus side protection device connection and 220-5 bus side protection connection. The selection method of the buscouple CT winding in the optimized busbar differential protection devices provided by the invention has the effects that when an A type busbar differential protection device and a B type busbar differential protection device are selected to be used in a combined way, and a connection method shown as a drawing 2 is adopted, for the A type busbar differential protection device, a buscouple 2245 is equivalent to an element on four buses, for the B type busbar differential protection device, the buscouple 2245 is equivalent to an element on five buses, the self design concept of each manufacturer is completely met, at the moment, a primitively designed action sequence or condition of the busbar differential protection devices can be respectively realized no matter whether the buscouple 2245 is in an off position or an on position, and the effect that the busbar differential protection devices can respectively and correctly act under any condition is really realized.
Description
Technical field
The invention belongs to electric power T & D Technology field, particularly relate to a kind of system of selection of optimizing mother CT winding in bus differential protection device.
Background technology
It is four directions, Nan Rui, Beijing, Nan Zi, Shenzhen, Nan Rui, Nanjing, Nanjing etc. that current Efficiency in Buildings in Tianjin Area is used the factory of more 220kV bus differential protection device.Each factory is different to the requirement of mother 2245 polarity; wherein four directions, Nan Zi, Beijing, Nanjing Nan Rui, Nanjing factory is considered as 4 bus units by mother 2245; require polarity take 4 buses as timing identical with line polarity; and the bus differential protection device of Shenzhen Nan Rui factory is that mother 2245 is considered as to 5 bus units; require polarity take 5 buses as timing identical with line polarity; it is contrary with line polarity as timing to be that polarity be take 4 buses, and these difference just likely cause when selecting CT winding group and go wrong.
Fig. 1 is mother CT winding connection diagram in bus differential protection device in a 220kV transformer station; other outgoing line units and disconnecting link part have been omitted in figure; with regard to these six groups of CT windings of mother; the first current transformer 1 is for charge protection; the second current transformer 2 is for fault oscillograph; the 3rd current transformer 3, the 4th current transformer 4 are for bus protection, and the 5th current transformer 5, the 6th current transformer 6 are for measurement, charging.
RCS-915 in Nanjing Nan Rui factory; the SGB-750 of Nanjing Nan Zi factory; in the bus differential protection device of the CSC-150 of four directions, Beijing factory; by mother 2245 as being the 220kV-4 bus bar elements, and the BP-2 bus differential protection device of Shenzhen Nan Rui factory by mother 2245 as being the 220kV-5 bus bar elements.Therefore four directions, Nan Zi, Beijing, Nan Rui, Nanjing, Nanjing give birth to the bus differential protection device of producer can combination in any, 3,4 groups of using mother 2245CT winding.If but only select wherein a set of in the bus differential protection device of above-mentioned 3 factories, another set of selection be the BP-2 bus differential protection device of Shenzhen Nan Rui factory, this configuration of Efficiency in Buildings in Tianjin Area is many, at this moment just be easy to occur mistake, the connection of mistake is that the RCS-915 bus differential protection device of Nanjing Nan Rui factory has been received to the 3rd group, the BP-2 bus differential protection device of Shenzhen Nan Rui factory has been received the 4th group, as shown in Figure 1; Now, by design philosophy, the RCS-915 bus differential protection device is equivalent to 4 bus bar elements, and the BP-2 bus differential protection device is equivalent to 5 female poor elements.Below just Fig. 1 analyze several fault types:
The first: mother 2245 switches are in co-bit.
Fault occurs in the A place, and correct connection is that 4 mothers of RCS-915 bus differential protection device are differential, and 5 mothers of BP-2 bus differential protection device are differential.And now 5 of the RCS-915 bus differential protection device female differential, BP-2 bus differential protection device 4 female differential, such result is the same, but correct operation truly do not meet, and what this was moving does not move, the action that should not move.
The second: mother 2245 switches are in a minute position.
Being the analysis of failure point equally in the situation that the A place, in this case, should be 4 female differential works of RCS-915 bus differential protection device and the element on 4 buses is excised.But present this connection, action be 5 buses of RCS-915 bus differential protection device, non-fault element has been excised, fault element is on the contrary not excision, so just by the expanded range of fault.In like manner, when fault occurs in the B place, incorrect operation be the BP-2 bus differential protection device, result is all affected system stable.
Summary of the invention
In order to address the above problem, the object of the present invention is to provide a kind of system of selection of optimizing mother CT winding in bus differential protection device.
In order to achieve the above object, in optimization bus differential protection device provided by the invention, the system of selection of mother CT winding comprises the following step carried out in order:
Step 1: the S01 stage that bus differential protection device is classified; The technical specification provided according to bus differential protection device manufacturer is divided into two classes by bus differential protection device:
Class A: it is the bus differential protection device of 220-4 bus bar side element that mother 2245 is used as;
Class B: it is the bus differential protection device of 220-5 bus bar side element that mother 2245 is used as;
Step 2: the S02 stage of determining connection scheme; Determine connection scheme by following principle:
2.1, in 220-4 bus bar side and 220-5 bus bar side, must select respectively the bus differential protection device of the different performance of different manufacturers production;
2.2 if two selected bus differential protection devices are the Class A bus differential protection device, can with the current transformer summation current transformer, be connected respectively by combination in any;
If 2.3 two selected bus differential protection devices one of them be the Class B bus differential protection device, the Class B bus differential protection device must must be connected with current transformer with current transformer, Class A bus differential protection device;
Step 3: the S03 stage that connects 220-4 bus bar side protective device; Connect the line between current transformer and 220-4 bus bar side bus differential protection device according to determined scheme of S02 stage;
Step 4: the S04 stage that connects the protection of 220-5 bus bar side; Connect the line between current transformer and 220-5 bus bar side bus differential protection device according to determined scheme of S02 stage.
2, system of selection according to claim 1, it is characterized in that: at S03 in the stage, when selecting two Class A bus differential protection devices, 220-4 bus bar side current transformer comprises tri-current transformers of CT3-A, CT3-B, CT3-C that are arranged on three-phase bus, wherein the sign end of CT3-A current transformer is connected with Class A bus differential protection device A phase current input terminal Xa, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn; The sign end of CT3-B current transformer is connected with Class A bus differential protection device B phase current input terminal Xb, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn; The sign end of CT3-C current transformer is connected with Class A bus differential protection device C phase current input terminal Xc, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn.
3, system of selection according to claim 1, it is characterized in that: at S03 in the stage, when selecting a Class A bus differential protection device and a Class B bus differential protection device, the Class B bus differential protection device must be arranged on the 220-4 bus bar side, 220-4 bus bar side current transformer comprises tri-current transformers of CT3-A, CT3-B, CT3-C that are arranged on three-phase bus, wherein the sign end of CT3-A current transformer is connected with Class B bus differential protection device A phase current input terminal Xa, and its non-sign end is connected with Class B bus differential protection device neutral line terminal Xn; The sign end of CT3-B current transformer is connected with Class B bus differential protection device B phase current input terminal Xb, and its non-sign end is connected with Class B bus differential protection device neutral line terminal Xn; The sign end of CT3-C current transformer is connected with Class B bus differential protection device C phase current input terminal Xc, and its non-sign end is connected with Class B bus differential protection device neutral line terminal Xn.
4, system of selection according to claim 1, it is characterized in that: at S04 in the stage, when selecting two Class A bus differential protection devices, 220-5 bus bar side current transformer comprises tri-current transformers of CT4-A, CT4-B, CT4-C that are arranged on three-phase bus, wherein the sign end of CT4-A current transformer is connected with Class A bus differential protection device A phase current input terminal Xa, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn; The sign end of CT4-B current transformer is connected with Class A bus differential protection device B phase current input terminal Xb, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn; The sign end of CT4-C current transformer is connected with Class A bus differential protection device C phase current input terminal Xc, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn.
5, system of selection according to claim 1, it is characterized in that: at S04 in the stage, when selecting a Class A bus differential protection device and a Class B bus differential protection device, the Class A bus differential protection device must be arranged on the 220-5 bus bar side, 220-5 bus bar side current transformer comprises tri-current transformers of CT4-A, CT4-B, CT4-C that are arranged on three-phase bus, wherein the sign end of CT4-A current transformer is connected with Class A bus differential protection device A phase current input terminal Xa, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn; The sign end of CT4-B current transformer is connected with Class A bus differential protection device B phase current input terminal Xb, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn; The sign end of CT4-C current transformer is connected with Class A bus differential protection device C phase current input terminal Xc, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn.
6, system of selection according to claim 1, it is characterized in that: at S01 in the stage, described Class A bus differential protection device comprises: the CSC-150 bus differential protection device of the SGB-750 of the RCS-915 of Nanjing Nan Rui factory, Nanjing Nan Zi factory and four directions, Beijing factory; The BP-2 bus differential protection device that the Class B bus differential protection device is Shenzhen Nan Rui factory.
The effect of the system of selection of mother CT winding in optimization bus differential protection device provided by the invention: when selecting Class A bus differential protection device and Class B bus differential protection device to be used in combination, and during by connection as shown in Figure 2, concerning the bus differential protection device of Class A, mother 2245 just is equivalent to an element on four buses, and mother 2245 just is equivalent to an element on five buses concerning the Class B bus differential protection device, the design concept that meets each producer oneself fully, now no matter mother 2245 all can realize bus differential protection device sequence of movement or the situation of initial design in minute position or co-bit, really realize that under any circumstance bus differential protection device all can correct operation.
The accompanying drawing explanation
Mother CT winding connection diagram in the bus differential protection device that Fig. 1 is prior art.
The connection scheme schematic diagram of the system of selection that Fig. 2 is mother CT winding in optimization bus differential protection device provided by the invention when selecting the same type bus differential protection device.
The winding diagram of system of selection when selecting the same type bus differential protection device that Fig. 3 is mother CT winding in optimization bus differential protection device provided by the invention.
The connection scheme schematic diagram of the system of selection that Fig. 4 is mother CT winding in optimization bus differential protection device provided by the invention when selecting dissimilar bus differential protection device.
The winding diagram of system of selection when selecting dissimilar bus differential protection device that Fig. 5 is mother CT winding in optimization bus differential protection device provided by the invention.
Embodiment
System of selection below in conjunction with the drawings and specific embodiments to mother CT winding in optimization bus differential protection device provided by the invention is elaborated.
As shown in Figure 2, in optimization bus differential protection device provided by the invention, the system of selection of mother CT winding comprises the following step carried out in order:
Step 1: the S01 stage that bus differential protection device is classified; The technical specification provided according to bus differential protection device manufacturer is divided into two classes by bus differential protection device:
Class A: it is the bus differential protection device of 220-4 bus bar side element that mother 2245 is used as;
Class B: it is the bus differential protection device of 220-5 bus bar side element that mother 2245 is used as;
Step 2: the S02 stage of determining connection scheme; Determine connection scheme by following principle:
2.1, in 220-4 bus bar side and 220-5 bus bar side, must select respectively the bus differential protection device of the different performance of different manufacturers production;
2.2 if two selected bus differential protection devices are the Class A bus differential protection device, can with current transformer 3 summation current transformers 4, be connected respectively by combination in any, as shown in Figure 2;
If 2.3 two selected bus differential protection devices one of them be the Class B bus differential protection device, the Class B bus differential protection device must must be connected with current transformer 4 with current transformer 3, Class A bus differential protection device, as shown in Figure 4;
Step 3: the S03 stage that connects 220-4 bus bar side protective device; Connect the line between current transformer 3 and 220-4 bus bar side bus differential protection device according to determined scheme of S02 stage:
3.1 when selecting two Class A bus differential protection devices, in the 220-4 bus bar side, the method of attachment of Class A bus differential protection device as shown in Figure 3 a, 220-4 bus bar side current transformer 3 comprises tri-current transformers of CT3-A, CT3-B, CT3-C that are arranged on three-phase bus, wherein the sign end of CT3-A current transformer is connected with Class A bus differential protection device A phase current input terminal Xa, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn; The sign end of CT3-B current transformer is connected with Class A bus differential protection device B phase current input terminal Xb, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn; The sign end of CT3-C current transformer is connected with Class A bus differential protection device C phase current input terminal Xc, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn;
3.2 when selecting a Class A bus differential protection device and a Class B bus differential protection device, the Class B bus differential protection device must be arranged on the 220-4 bus bar side, method of attachment as shown in Figure 5 a, 220-4 bus bar side current transformer 4 comprises tri-current transformers of CT3-A, CT3-B, CT3-C that are arranged on three-phase bus, wherein the sign end of CT3-A current transformer is connected with Class B bus differential protection device A phase current input terminal Xa, and its non-sign end is connected with Class B bus differential protection device neutral line terminal Xn; The sign end of CT3-B current transformer is connected with Class B bus differential protection device B phase current input terminal Xb, and its non-sign end is connected with Class B bus differential protection device neutral line terminal Xn; The sign end of CT3-C current transformer is connected with Class B bus differential protection device C phase current input terminal Xc, and its non-sign end is connected with Class B bus differential protection device neutral line terminal Xn;
Step 4: the S04 stage that connects the protection of 220-5 bus bar side; Connect the line between current transformer 4 and 220-5 bus bar side bus differential protection device according to determined scheme of S02 stage:
4.1 when selecting two Class A bus differential protection devices, in the 220-5 bus bar side, the method of attachment of Class A bus differential protection device is as shown in Fig. 3 b, 220-5 bus bar side current transformer 4 comprises tri-current transformers of CT4-A, CT4-B, CT4-C that are arranged on three-phase bus, wherein the sign end of CT4-A current transformer is connected with Class A bus differential protection device A phase current input terminal Xa, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn; The sign end of CT4-B current transformer is connected with Class A bus differential protection device B phase current input terminal Xb, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn; The sign end of CT4-C current transformer is connected with Class A bus differential protection device C phase current input terminal Xc, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn;
4.2 when selecting a Class A bus differential protection device and a Class B bus differential protection device, the Class A bus differential protection device must be arranged on the 220-5 bus bar side, method of attachment as shown in Figure 5 b, 220-5 bus bar side current transformer 4 comprises tri-current transformers of CT4-A, CT4-B, CT4-C that are arranged on three-phase bus, wherein the sign end of CT4-A current transformer is connected with Class A bus differential protection device A phase current input terminal Xa, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn; The sign end of CT4-B current transformer is connected with Class A bus differential protection device B phase current input terminal Xb, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn; The sign end of CT4-C current transformer is connected with Class A bus differential protection device C phase current input terminal Xc, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn.
Described Class A bus differential protection device comprises: the CSC-150 bus differential protection device of the SGB-750 of the RCS-915 of Nanjing Nan Rui factory, Nanjing Nan Zi factory and four directions, Beijing factory; The BP-2 bus differential protection device that the Class B bus differential protection device is Shenzhen Nan Rui factory.
Claims (6)
1. a system of selection of optimizing mother CT winding in bus differential protection device, it is characterized in that: described system of selection comprises the following step carried out in order:
Step 1: the S01 stage that bus differential protection device is classified; The technical specification provided according to bus differential protection device manufacturer is divided into two classes by bus differential protection device:
Class A: it is the bus differential protection device of 220-4 bus bar side element that mother 2245 is used as;
Class B: it is the bus differential protection device of 220-5 bus bar side element that mother 2245 is used as;
Step 2: the S02 stage of determining connection scheme; Determine connection scheme by following principle:
2.1, in 220-4 bus bar side and 220-5 bus bar side, must select respectively the bus differential protection device of the different performance of different manufacturers production;
2.2 if two selected bus differential protection devices are the Class A bus differential protection device, can with current transformer (3) summation current transformer (4), be connected respectively by combination in any;
If 2.3 two selected bus differential protection devices one of them be the Class B bus differential protection device, the Class B bus differential protection device must must be connected with current transformer (4) with current transformer (3), Class A bus differential protection device;
Step 3: the S03 stage that connects 220-4 bus bar side protective device; Connect the line between current transformer (3) and 220-4 bus bar side bus differential protection device according to determined scheme of S02 stage;
Step 4: the S04 stage that connects the protection of 220-5 bus bar side; Connect the line between current transformer (4) and 220-5 bus bar side bus differential protection device according to determined scheme of S02 stage.
2. system of selection according to claim 1, it is characterized in that: at S03 in the stage, when selecting two Class A bus differential protection devices, 220-4 bus bar side current transformer (3) comprises tri-current transformers of CT3-A, CT3-B, CT3-C that are arranged on three-phase bus, wherein the sign end of CT3-A current transformer is connected with Class A bus differential protection device A phase current input terminal Xa, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn; The sign end of CT3-B current transformer is connected with Class A bus differential protection device B phase current input terminal Xb, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn; The sign end of CT3-C current transformer is connected with Class A bus differential protection device C phase current input terminal Xc, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn.
3. system of selection according to claim 1, it is characterized in that: at S03 in the stage, when selecting a Class A bus differential protection device and a Class B bus differential protection device, the Class B bus differential protection device must be arranged on the 220-4 bus bar side, 220-4 bus bar side current transformer (4) comprises tri-current transformers of CT3-A, CT3-B, CT3-C that are arranged on three-phase bus, wherein the sign end of CT3-A current transformer is connected with Class B bus differential protection device A phase current input terminal Xa, and its non-sign end is connected with Class B bus differential protection device neutral line terminal Xn; The sign end of CT3-B current transformer is connected with Class B bus differential protection device B phase current input terminal Xb, and its non-sign end is connected with Class B bus differential protection device neutral line terminal Xn; The sign end of CT3-C current transformer is connected with Class B bus differential protection device C phase current input terminal Xc, and its non-sign end is connected with Class B bus differential protection device neutral line terminal Xn.
4. system of selection according to claim 1, it is characterized in that: at S04 in the stage, when selecting two Class A bus differential protection devices, 220-5 bus bar side current transformer (4) comprises tri-current transformers of CT4-A, CT4-B, CT4-C that are arranged on three-phase bus, wherein the sign end of CT4-A current transformer is connected with Class A bus differential protection device A phase current input terminal Xa, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn; The sign end of CT4-B current transformer is connected with Class A bus differential protection device B phase current input terminal Xb, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn; The sign end of CT4-C current transformer is connected with Class A bus differential protection device C phase current input terminal Xc, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn.
5. system of selection according to claim 1, it is characterized in that: at S04 in the stage, when selecting a Class A bus differential protection device and a Class B bus differential protection device, the Class A bus differential protection device must be arranged on the 220-5 bus bar side, 220-5 bus bar side current transformer (4) comprises tri-current transformers of CT4-A, CT4-B, CT4-C that are arranged on three-phase bus, wherein the sign end of CT4-A current transformer is connected with Class A bus differential protection device A phase current input terminal Xa, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn; The sign end of CT4-B current transformer is connected with Class A bus differential protection device B phase current input terminal Xb, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn; The sign end of CT4-C current transformer is connected with Class A bus differential protection device C phase current input terminal Xc, and its non-sign end is connected with Class A bus differential protection device neutral line terminal Xn.
6. system of selection according to claim 1, it is characterized in that: at S01 in the stage, described Class A bus differential protection device comprises: the CSC-150 bus differential protection device of the SGB-750 of the RCS-915 of Nanjing Nan Rui factory, Nanjing Nan Zi factory and four directions, Beijing factory; The BP-2 bus differential protection device that the Class B bus differential protection device is Shenzhen Nan Rui factory.
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| CN103500990B (en) | 2016-02-10 |
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