CN103500990B - A kind of system of selection optimizing mother CT winding in bus differential protection device - Google Patents
A kind of system of selection optimizing mother CT winding in bus differential protection device Download PDFInfo
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Abstract
A kind of system of selection optimizing mother CT winding in bus differential protection device.It comprises classifies to bus differential protection device, determines connection scheme, connects 220-4 bus bar side protective device, connects the stages such as 220-5 bus bar side protection.The effect of the system of selection of mother CT winding in optimization bus differential protection device provided by the invention: combinationally use when selecting Class A bus differential protection device and Class B bus differential protection device, and when pressing connection as shown in Figure 2, mother 2245 the bus differential protection device of Class A is just equivalent to an element on four buses, and element mother 2245 Class B bus differential protection device is just equivalent on five buses, meet the design concept of each producer oneself completely, now no matter mother 2245 all can realize bus differential protection device sequence of movement or the situation of initial design in point position or co-bit, real realization under any circumstance bus differential protection device all can correct operation.
Description
Technical field
The invention belongs to electric power T & D Technology field, particularly relate to a kind of system of selection optimizing mother CT winding in bus differential protection device.
Background technology
Current Efficiency in Buildings in Tianjin Area uses the factory of more 220kV bus differential protection device to be that south, Nanjing is auspicious, Nanjing is southern certainly, south, Shenzhen is auspicious, Beijing is cubic.The requirement of each factory to mother 2245 polarity is different; wherein south, Nanjing is auspicious, Nanjing is southern certainly, mother 2245 is considered as 4 bus units by four directions, Beijing factory; require polarity with 4 buses for timing is identical with line polarity; and the bus differential protection device of Shenzhen Nan Rui factory mother 2245 is considered as 5 bus units; require polarity with 5 buses for timing is identical with line polarity; namely polarity is with 4 buses for timing is contrary with line polarity, and these difference just likely cause and go wrong when selection CT winding group.
Fig. 1 is mother CT winding switching schematic diagram in bus differential protection device in a 220kV transformer station; other outgoing line units and disconnecting link part is omitted in figure; with regard to these six groups of CT windings of mother; first current transformer 1 is for charge protection; second current transformer 2 is for fault oscillograph; 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.
At the RCS-915 of Nanjing Nan Rui factory; south, Nanjing is from the SGB-750 of factory; in the bus differential protection device of the CSC-150 of four directions, Beijing factory; by mother 2245 as being 220kV-4 bus bar elements, and the BP-2 bus differential protection device of Shenzhen Nan Rui factory by mother 2245 as being 220kV-5 bus bar elements.Therefore the southern bus differential protection device from, the raw producer in four directions, Beijing in auspicious, Nanjing, south, Nanjing can combination in any, uses 3,4 groups of 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 in Efficiency in Buildings in Tianjin Area is many, at this moment be just 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 the 3rd group, the BP-2 bus differential protection device of Shenzhen Nan Rui factory has received the 4th group, as shown in Figure 1; Now by design philosophy, RCS-915 bus differential protection device is equivalent to 4 bus bar elements, and BP-2 bus differential protection device is equivalent to 5 female difference elements.Just Fig. 1 analyzes several fault type below:
The first: mother 2245 switch is in co-bit.
Fault occurs in 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 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 does not meet, this dynamic not moving, should not the action of action.
The second: mother 2245 switch is in a point position.
Be equally analysis of failure point when A place, in this case, should be RCS-915 bus differential protection device 4 female differential works and by the element excision on 4 buses.But present this connection, action be 5 buses of RCS-915 bus differential protection device, by non-faulting element excision, fault element does not excise on the contrary, so just by the expanded range of fault.In like manner, when fault occurs in B place, incorrect operation be BP-2 bus differential protection device, result is all have impact on system stable.
Summary of the invention
In order to solve the problem, the object of the present invention is to provide a kind of system of selection 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 one: the S01 stage that bus differential protection device is classified; According to the technical specification that bus differential protection device manufacturer provides, bus differential protection device is divided into two classes:
Class A: mother 2245 being used as is the bus differential protection device of 220-4 bus bar side element;
Class B: mother 2245 being used as is the bus differential protection device of 220-5 bus bar side element;
Step 2: the S02 stage determining connection scheme; By following principle determination connection scheme:
2.1 in 220-4 bus bar side and 220-5 bus bar side, the bus differential protection device of the different performance that must different manufacturers selected respectively to produce;
If 2.2 two bus differential protection devices selected are Class A bus differential protection device, then can be connected with current transformer summation current transformer respectively by combination in any;
If 2.3 selected two bus differential protection devices one of them be Class B bus differential protection device, then 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 connecting 220-4 bus bar side protective device; The line between current transformer and 220-4 bus bar side bus differential protection device is connected according to S02 stage determined scheme;
Step 4: the S04 stage connecting the protection of 220-5 bus bar side; The line between current transformer and 220-5 bus bar side bus differential protection device is connected according to S02 stage determined scheme.
2, system of selection according to claim 1, it is characterized in that: in the S03 stage, when selecting two Class A bus differential protection devices, 220-4 bus bar side current transformer comprises CT3-A, CT3-B, CT3-C tri-current transformers be arranged on three-phase bus, wherein the mark end of CT3-A current transformer is connected with Class A bus differential protection device A phase current input terminal Xa, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn; The mark end of CT3-B current transformer is connected with Class A bus differential protection device B phase current input terminal Xb, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn; The mark end of CT3-C current transformer is connected with Class A bus differential protection device C phase current input terminal Xc, and its non-mark 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: in the S03 stage, when selecting a Class A bus differential protection device and a Class B bus differential protection device, then Class B bus differential protection device must be arranged on 220-4 bus bar side, 220-4 bus bar side current transformer comprises CT3-A, CT3-B, CT3-C tri-current transformers be arranged on three-phase bus, wherein the mark end of CT3-A current transformer is connected with Class B bus differential protection device A phase current input terminal Xa, and its non-mark end is connected with Class B bus differential protection device neutral line terminal Xn; The mark end of CT3-B current transformer is connected with Class B bus differential protection device B phase current input terminal Xb, and its non-mark end is connected with Class B bus differential protection device neutral line terminal Xn; The mark end of CT3-C current transformer is connected with Class B bus differential protection device C phase current input terminal Xc, and its non-mark 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: in the S04 stage, when selecting two Class A bus differential protection devices, 220-5 bus bar side current transformer comprises CT4-A, CT4-B, CT4-C tri-current transformers be arranged on three-phase bus, wherein the mark end of CT4-A current transformer is connected with Class A bus differential protection device A phase current input terminal Xa, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn; The mark end of CT4-B current transformer is connected with Class A bus differential protection device B phase current input terminal Xb, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn; The mark end of CT4-C current transformer is connected with Class A bus differential protection device C phase current input terminal Xc, and its non-mark 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: in the S04 stage, when selecting a Class A bus differential protection device and a Class B bus differential protection device, then Class A bus differential protection device must be arranged on 220-5 bus bar side, 220-5 bus bar side current transformer comprises CT4-A, CT4-B, CT4-C tri-current transformers be arranged on three-phase bus, wherein the mark end of CT4-A current transformer is connected with Class A bus differential protection device A phase current input terminal Xa, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn; The mark end of CT4-B current transformer is connected with Class A bus differential protection device B phase current input terminal Xb, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn; The mark end of CT4-C current transformer is connected with Class A bus differential protection device C phase current input terminal Xc, and its non-mark 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: in the S01 stage, described Class A bus differential protection device comprises: RCS-915, the SGB-750 of south, Nanjing from factory of Nanjing Nan Rui factory and the CSC-150 bus differential protection device of four directions, Beijing factory; Class B bus differential protection device is the BP-2 bus differential protection device of 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: combinationally use when selecting Class A bus differential protection device and Class B bus differential protection device, and when pressing connection as shown in Figure 2, mother 2245 the bus differential protection device of Class A is just equivalent to an element on four buses, and element mother 2245 Class B bus differential protection device is just equivalent on five buses, meet the design concept of each producer oneself completely, now no matter mother 2245 all can realize bus differential protection device sequence of movement or the situation of initial design in point position or co-bit, real realization under any circumstance bus differential protection device all can correct operation.
Accompanying drawing explanation
Fig. 1 is mother CT winding switching schematic diagram in the bus differential protection device of prior art.
Fig. 2 is the connection scheme schematic diagram of system of selection when selecting identical type bus differential protection device of mother CT winding in optimization bus differential protection device provided by the invention.
Fig. 3 is the winding diagram of system of selection when selecting identical type bus differential protection device of mother CT winding in optimization bus differential protection device provided by the invention.
Fig. 4 is the connection scheme schematic diagram of system of selection when selecting dissimilar bus differential protection device of mother CT winding in optimization bus differential protection device provided by the invention.
Fig. 5 is the winding diagram of system of selection when selecting dissimilar bus differential protection device of mother CT winding in optimization bus differential protection device provided by the invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the system of selection of mother CT winding in optimization bus differential protection device provided by the invention is described in detail.
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 one: the S01 stage that bus differential protection device is classified; According to the technical specification that bus differential protection device manufacturer provides, bus differential protection device is divided into two classes:
Class A: mother 2245 being used as is the bus differential protection device of 220-4 bus bar side element;
Class B: mother 2245 being used as is the bus differential protection device of 220-5 bus bar side element;
Step 2: the S02 stage determining connection scheme; By following principle determination connection scheme:
2.1 in 220-4 bus bar side and 220-5 bus bar side, the bus differential protection device of the different performance that must different manufacturers selected respectively to produce;
If 2.2 two bus differential protection devices selected are Class A bus differential protection device, then can be connected with current transformer 3 summation current transformer 4 respectively by combination in any, as shown in Figure 2;
If 2.3 selected two bus differential protection devices one of them be Class B bus differential protection device, then 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 connecting 220-4 bus bar side protective device; The line between current transformer 3 and 220-4 bus bar side bus differential protection device is connected according to S02 stage determined scheme:
3.1 when selecting two Class A bus differential protection devices, then in 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 CT3-A, CT3-B, CT3-C tri-current transformers be arranged on three-phase bus, wherein the mark end of CT3-A current transformer is connected with Class A bus differential protection device A phase current input terminal Xa, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn; The mark end of CT3-B current transformer is connected with Class A bus differential protection device B phase current input terminal Xb, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn; The mark end of CT3-C current transformer is connected with Class A bus differential protection device C phase current input terminal Xc, and its non-mark 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, then Class B bus differential protection device must be arranged on 220-4 bus bar side, method of attachment as shown in Figure 5 a, 220-4 bus bar side current transformer 4 comprises CT3-A, CT3-B, CT3-C tri-current transformers be arranged on three-phase bus, wherein the mark end of CT3-A current transformer is connected with Class B bus differential protection device A phase current input terminal Xa, and its non-mark end is connected with Class B bus differential protection device neutral line terminal Xn; The mark end of CT3-B current transformer is connected with Class B bus differential protection device B phase current input terminal Xb, and its non-mark end is connected with Class B bus differential protection device neutral line terminal Xn; The mark end of CT3-C current transformer is connected with Class B bus differential protection device C phase current input terminal Xc, and its non-mark end is connected with Class B bus differential protection device neutral line terminal Xn;
Step 4: the S04 stage connecting the protection of 220-5 bus bar side; The line between current transformer 4 and 220-5 bus bar side bus differential protection device is connected according to S02 stage determined scheme:
4.1 when selecting two Class A bus differential protection devices, then in 220-5 bus bar side, the method of attachment of Class A bus differential protection device as shown in Figure 3 b, 220-5 bus bar side current transformer 4 comprises CT4-A, CT4-B, CT4-C tri-current transformers be arranged on three-phase bus, wherein the mark end of CT4-A current transformer is connected with Class A bus differential protection device A phase current input terminal Xa, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn; The mark end of CT4-B current transformer is connected with Class A bus differential protection device B phase current input terminal Xb, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn; The mark end of CT4-C current transformer is connected with Class A bus differential protection device C phase current input terminal Xc, and its non-mark 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, then Class A bus differential protection device must be arranged on 220-5 bus bar side, method of attachment as shown in Figure 5 b, 220-5 bus bar side current transformer 4 comprises CT4-A, CT4-B, CT4-C tri-current transformers be arranged on three-phase bus, wherein the mark end of CT4-A current transformer is connected with Class A bus differential protection device A phase current input terminal Xa, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn; The mark end of CT4-B current transformer is connected with Class A bus differential protection device B phase current input terminal Xb, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn; The mark end of CT4-C current transformer is connected with Class A bus differential protection device C phase current input terminal Xc, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn.
Described Class A bus differential protection device comprises: RCS-915, the SGB-750 of south, Nanjing from factory of Nanjing Nan Rui factory and the CSC-150 bus differential protection device of four directions, Beijing factory; Class B bus differential protection device is the BP-2 bus differential protection device of Shenzhen Nan Rui factory.
Claims (2)
1. optimize a system of selection for 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 one: the S01 stage that bus differential protection device is classified; According to the technical specification that bus differential protection device manufacturer provides, bus differential protection device is divided into two classes:
Class A: mother 2245 being used as is the bus differential protection device of 220-4 bus bar side element;
Class B: mother 2245 being used as is the bus differential protection device of 220-5 bus bar side element;
Step 2: the S02 stage determining connection scheme; By following principle determination connection scheme:
2.1 in 220-4 bus bar side and 220-5 bus bar side, the bus differential protection device of the different performance that must different manufacturers selected respectively to produce;
If 2.2 two bus differential protection devices selected are Class A bus differential protection device, then can be connected with the 4th current transformer (4) with the 3rd current transformer (3) respectively by combination in any;
If 2.3 selected two bus differential protection devices one of them be Class B bus differential protection device, then Class B bus differential protection device must must be connected with the 4th current transformer (4) with the 3rd current transformer (3), Class A bus differential protection device;
Step 3: the S03 stage connecting 220-4 bus bar side protective device; The line between the 3rd current transformer (3) and 220-4 bus bar side bus differential protection device is connected according to S02 stage determined scheme; When selecting two Class A bus differential protection devices, 220-4 bus bar side the 3rd current transformer (3) comprises CT3-A, CT3-B, CT3-C tri-current transformers be arranged on three-phase bus, wherein the mark end of CT3-A current transformer is connected with Class A bus differential protection device A phase current input terminal Xa, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn; The mark end of CT3-B current transformer is connected with Class A bus differential protection device B phase current input terminal Xb, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn; The mark end of CT3-C current transformer is connected with Class A bus differential protection device C phase current input terminal Xc, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn;
When selecting a Class A bus differential protection device and a Class B bus differential protection device, then Class B bus differential protection device must be arranged on 220-4 bus bar side, 220-4 bus bar side the 4th current transformer (4) comprises CT3-A, CT3-B, CT3-C tri-current transformers be arranged on three-phase bus, wherein the mark end of CT3-A current transformer is connected with Class B bus differential protection device A phase current input terminal Xa, and its non-mark end is connected with Class B bus differential protection device neutral line terminal Xn; The mark end of CT3-B current transformer is connected with Class B bus differential protection device B phase current input terminal Xb, and its non-mark end is connected with Class B bus differential protection device neutral line terminal Xn; The mark end of CT3-C current transformer is connected with Class B bus differential protection device C phase current input terminal Xc, and its non-mark end is connected with Class B bus differential protection device neutral line terminal Xn;
Step 4: the S04 stage connecting the protection of 220-5 bus bar side; The line between the 4th current transformer (4) and 220-5 bus bar side bus differential protection device is connected according to S02 stage determined scheme; When selecting two Class A bus differential protection devices, 220-5 bus bar side the 4th current transformer (4) comprises CT4-A, CT4-B, CT4-C tri-current transformers be arranged on three-phase bus, wherein the mark end of CT4-A current transformer is connected with Class A bus differential protection device A phase current input terminal Xa, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn; The mark end of CT4-B current transformer is connected with Class A bus differential protection device B phase current input terminal Xb, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn; The mark end of CT4-C current transformer is connected with Class A bus differential protection device C phase current input terminal Xc, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn;
When selecting a Class A bus differential protection device and a Class B bus differential protection device, then Class A bus differential protection device must be arranged on 220-5 bus bar side, 220-5 bus bar side the 4th current transformer (4) comprises CT4-A, CT4-B, CT4-C tri-current transformers be arranged on three-phase bus, wherein the mark end of CT4-A current transformer is connected with Class A bus differential protection device A phase current input terminal Xa, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn; The mark end of CT4-B current transformer is connected with Class A bus differential protection device B phase current input terminal Xb, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn; The mark end of CT4-C current transformer is connected with Class A bus differential protection device C phase current input terminal Xc, and its non-mark end is connected with Class A bus differential protection device neutral line terminal Xn.
2. system of selection according to claim 1, it is characterized in that: in the S01 stage, described Class A bus differential protection device comprises: RCS-915, the SGB-750 of south, Nanjing from factory of Nanjing Nan Rui factory and the CSC-150 bus differential protection device of four directions, Beijing factory; Class B bus differential protection device is the BP-2 bus differential protection device of Shenzhen Nan Rui factory.
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| CN104407265A (en) * | 2014-11-14 | 2015-03-11 | 深圳供电局有限公司 | Method and device for monitoring line defects in bus differential protective current analog quantity of transformer substation |
| CN109088401A (en) * | 2018-08-23 | 2018-12-25 | 国网天津市电力公司 | A kind of double-bus differential protection circuit constituted based on current direction principle |
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