CN216625292U - Relay protection circuit for internal bridging transformer substation - Google Patents
Relay protection circuit for internal bridging transformer substation Download PDFInfo
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- CN216625292U CN216625292U CN202220004561.9U CN202220004561U CN216625292U CN 216625292 U CN216625292 U CN 216625292U CN 202220004561 U CN202220004561 U CN 202220004561U CN 216625292 U CN216625292 U CN 216625292U
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Abstract
The utility model relates to the technical field of substations, discloses a relay protection circuit for an inner bridge connection substation, aims to solve the problems of high cost and complex wiring of the traditional breaker failure protection scheme, and mainly comprises the following steps: first circuit breaker and first transformer have been connect on the I section generating line of transformer substation, second circuit breaker and second transformer have been connect on the II section generating line, connect through the third circuit breaker between I section generating line and the II section generating line, two transformers are equipped with main protection device respectively, first circuit breaker is equipped with first line protection device, the second circuit breaker is equipped with second line protection device, first main protection device, second main protection device, first line protection device and second line protection device are connected with bus protection device respectively, bus protection device still respectively with the third circuit breaker, the control terminal of first transformer low pressure side circuit breaker and second transformer low pressure side circuit breaker is connected. The utility model reduces the equipment cost and wiring complexity.
Description
Technical Field
The utility model relates to the technical field of substations, in particular to a relay protection circuit for an internal bridging substation.
Background
The inner bridge connection is a connection mode that the bus is connected at the inner sides of two transformer switches (special circuit breakers) and is close to the transformer side, namely when only two transformers and two outgoing lines are arranged, and each transformer is connected with one outgoing line through one circuit breaker, the transformer sides of the two circuit breakers are directly connected through the bridge circuit breakers.
When an internal bridge connection line is adopted, a relay protection configuration scheme is generally completed by setting main transformer protection and line protection, a line protective belt has a reclosing function, and then a line circuit breaker and a bridge circuit breaker failure protection device are independently configured.
As shown in fig. 1, when a short-circuit fault occurs at main transformer branch K1, line breaker DL1 and bridge breaker DL3 are tripped by the main transformer differential protection; when a fault occurs in the K2 on the line, the line breaker DL1 can be directly tripped through line protection. Although the conventional relay protection configuration mode, namely a mode of 'line protection + main transformer protection + breaker failure protection', can provide full-range quick-acting protection for the inner bridge connection line, the equipment investment cost is correspondingly increased, in order to realize the failure protection of three breakers DL1, DL2 and DL3, the breaker failure protection devices 50BF need to be respectively and independently configured, and three sets of breaker protection devices need to be configured in total; meanwhile, the complexity of secondary wiring is greatly increased, for example, the wiring of adjacent circuit breakers is increased when the circuit breakers are started to work and the adjacent circuit breakers are jumped due to failure.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems of high cost and complex wiring in the existing breaker failure protection scheme in an internal bridging line, and provides a relay protection circuit for an internal bridging transformer substation.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a relay protection circuit for interior bridging line transformer substation, the transformer substation is equipped with I section generating line and II section generating lines, it has first circuit breaker and first transformer to connect on the I section generating line, it has second circuit breaker and second transformer to connect on the II section generating line, connects through the third circuit breaker between I section generating line and the II section generating line, first circuit breaker is connected with first transformer substation through first circuit, the second circuit breaker passes through the second circuit and is connected with the second transformer substation, still includes: bus bar protection device, first transformer is equipped with first main protection device that becomes, the second transformer is equipped with the second and becomes protection device, first circuit breaker is equipped with first line protection device, the second circuit breaker is equipped with second line protection device, first main protection device, second main protection device, first line protection device and second line protection device are connected with bus bar protection device respectively, bus bar protection device still is connected with the control terminal of third circuit breaker, first transformer low pressure side circuit breaker and second transformer low pressure side circuit breaker respectively.
As further optimization, first owner becomes protection device and first circuit protection device and is connected with generating line protection device respectively, specifically includes:
one end of a normally open contact of a first tripping relay in the first main transformer protection device is connected with a first input terminal of the bus protection device, and the other end of the normally open contact of the first tripping relay is connected with a second input terminal of the bus protection device; one end of a normally open contact of a second tripping relay in the first circuit protection device is connected with a third input terminal of the bus protection device, the other end of the normally open contact of the second tripping relay is connected with a fourth input terminal of the bus protection device, and the first tripping relay and the second tripping relay are used for tripping the first circuit breaker.
As further optimization, the bus protection device still is connected with the control terminal of third circuit breaker and first transformer low-voltage side circuit breaker respectively, specifically includes:
a first output terminal of a first output tripping contact of the bus protection device is connected with a first control terminal of a third circuit breaker, and a second output terminal of the first output tripping contact is connected with a second control terminal of the third circuit breaker; and a third output terminal of a second output tripping contact of the bus protection device is connected with a first control terminal of the first main transformer protection device, and a fourth output terminal of the second output tripping contact is connected with a second control terminal of the first main transformer protection device.
As further optimization, second owner becomes protection device and second line protection device and is connected with generating line protection device respectively, specifically includes:
one end of a normally open contact of a third tripping relay in the second main transformer protection device is connected with a fifth input terminal of the bus protection device, and the other end of the normally open contact of the third tripping relay is connected with a sixth input terminal of the bus protection device; and one end of a normally open contact of a fourth tripping relay in the second line protection device is connected with a seventh input terminal of the bus protection device, the other end of the normally open contact of the fourth tripping relay is connected with an eighth input terminal of the bus protection device, and the third tripping relay and the fourth tripping relay are used for tripping a second circuit breaker.
As further optimization, the bus protection device still is connected with the control terminal of third circuit breaker and second transformer low-voltage side circuit breaker respectively, specifically includes:
a fifth output terminal of a third output tripping contact of the bus protection device is connected with a third control terminal of a third relay, and a sixth output terminal of the third output tripping contact is connected with a fourth control terminal of the third relay; and a seventh output terminal of a fourth output tripping contact of the bus protection device is connected with a first control terminal of a second main transformer protection device, and an eighth output terminal of the fourth output tripping contact is connected with a second control terminal of the second main transformer protection device.
As further optimization, first owner becomes protection device and second owner becomes protection device and is connected with generating line protection device respectively, specifically still includes:
one end of a normally open contact of a fifth tripping relay in the first main transformer protection device is connected with a ninth input terminal of the bus protection device, and the other end of the normally open contact of the fifth tripping relay is connected with a tenth input terminal of the bus protection device; one end of a normally open contact of a sixth tripping relay of the second main transformer protection device is connected with an eleventh input terminal of the bus protection device, the other end of the normally open contact of the sixth tripping relay of the second main transformer protection device is connected with a twelfth input terminal of the bus protection device, and the fifth tripping relay and the sixth tripping relay are used for tripping the third relay.
As further optimization, the bus protection device still is connected with the control terminal of first transformer low pressure side circuit breaker and second transformer low pressure side circuit breaker respectively, specifically includes:
a ninth output terminal of a fifth output tripping contact of the bus protection device is connected with a third control terminal of the first main transformer protection device, and a tenth output terminal of the fifth output tripping contact is connected with a fourth control terminal of the first main transformer protection device; and an eleventh output terminal of a sixth output tripping contact of the bus protection device is connected with a third control terminal of the second main transformer protection device, and a twelfth output terminal of the sixth output tripping contact is connected with a fourth control terminal of the second main transformer protection device.
The beneficial effects of the utility model are: according to the relay protection circuit for the internal bridging transformer substation, the failure protection functions of the three circuit breakers can be realized by only adding 1 set of bus protection device (including the bus switch failure protection), so that the equipment investment is reduced, and the complexity of secondary wiring is greatly reduced.
Drawings
Fig. 1 is a schematic structural diagram of a relay protection circuit in the prior art;
fig. 2 is a schematic structural diagram of a relay protection circuit for an internal bridging substation according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a failure protection wiring of the first circuit breaker DL1 according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a second circuit breaker DL2 fault protection wiring according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a fault protection wiring of a third circuit breaker DL3 according to an embodiment of the present invention;
description of the reference numerals:
50 BF-circuit breaker failure protection device; DL 1-first breaker; DL 2-second breaker; DL 3-third breaker; l1 — first line; l2 — second line; LP1 — first line protection device; LP2 — second line protection device; TM 1-first main transformer protection device; TM 2-second main transformer protection device; 87B/50 BF-bus protection device.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The utility model provides a relay protection circuit for an internal bridging transformer substation, wherein the transformer substation is provided with a first section of bus and a second section of bus, the first section of bus is connected with a first circuit breaker and a first transformer, the second section of bus is connected with a second circuit breaker and a second transformer, the first section of bus and the second section of bus are connected through a third circuit breaker, the first circuit breaker is connected with the first transformer substation through a first line, and the second circuit breaker is connected with the second transformer substation through a second line, and the relay protection circuit further comprises: bus bar protection device, first transformer is equipped with first main protection device that becomes, the second transformer is equipped with the second and becomes protection device, first circuit breaker is equipped with first line protection device, the second circuit breaker is equipped with second line protection device, first main protection device, second main protection device, first line protection device and second line protection device are connected with bus bar protection device respectively, bus bar protection device still is connected with the control terminal of third circuit breaker, first transformer low pressure side circuit breaker and second transformer low pressure side circuit breaker respectively.
Specifically, the first line protection device and the second line protection device have line main backup protection and reclosing functions, the first main transformer protection device and the second main transformer protection device have main transformer main backup protection functions, and the bus protection device has bus differential protection, failure protection, charging protection and other functions. The bus protection device judges whether the first circuit breaker, the second circuit breaker and the third circuit breaker are out of order or not according to signals input by the first main transformer protection device, the second main transformer protection device, the first line protection device and the second line protection device, when the bus protection judges that the first circuit breaker is out of order, a bus protection outlet trips the third circuit breaker, meanwhile, a 'failure joint tripping TM1 low-voltage side circuit breaker' signal is sent to the first main transformer protection device, and the first main transformer protection device TM1 acts to trip the low-voltage side circuit breaker. When the bus protection judges that the second circuit breaker fails, the bus protection outlet trips a third circuit breaker, meanwhile, a failure combined tripping TM2 low-voltage side circuit breaker signal is sent to a second main transformer protection device, and the second main transformer protection device acts to trip the low-voltage side circuit breaker. When the bus protection judges that the third circuit breaker fails, signals of a failure joint trip TM1 low-voltage side circuit breaker and a failure joint trip TM2 low-voltage side circuit breaker are sent simultaneously to the first main transformer protection device and the second main transformer protection device respectively, and the low-voltage side circuit breakers are tripped through respective actions. When the line protection trips the first circuit breaker and the second circuit breaker, the circuit breakers on the opposite side of the line can be tripped simultaneously; when main transformer protection or bus protection jumps a first circuit breaker and a second circuit breaker, the opposite-side circuit breaker can be jumped in a joint mode, so that when the bus protection judges that the first circuit breaker and the second circuit breaker are out of order, signals for jumping the circuit opposite-side circuit breaker are not sent.
Examples
The relay protection circuit described in this embodiment is applied to interior bridging line transformer substation, as shown in fig. 2, the transformer substation is equipped with I section generating line and II section generating lines, it has first circuit breaker DL1 and first transformer to connect on the I section generating line, it has second circuit breaker DL2 and second transformer to connect on the II section generating line, connects through third circuit breaker DL3 between I section generating line and the II section generating line, first circuit breaker DL1 is connected with first transformer substation through first circuit L1, second circuit breaker DL2 is connected with the second transformer substation through second circuit L2.
The embodiment is provided with a bus protection device 87B/50BF, in addition, the first transformer is further provided with a first main transformer protection device TM1, the second transformer is provided with a second main transformer protection device TM2, the first circuit breaker DL1 is provided with a first line protection device LP1, the second circuit breaker DL2 is provided with a second line protection device LP2, the first main transformer protection device TM1, the second main transformer protection device TM2, the first line protection device LP1 and the second line protection device LP2 are respectively connected with the bus protection device 87B/50BF, and the bus protection device 87B/50BF is further respectively connected with a control terminal of a third circuit breaker DL3, a first transformer low-voltage side circuit breaker and a second transformer low-voltage side circuit breaker.
The first line protection device LP1 and the second line protection device LP2 have line main backup protection and reclosing functions, the first main transformer protection device TM1 and the second main transformer protection device TM2 have main transformer main backup protection functions, and the bus protection device 87B/50BF has bus differential protection, failure protection, charging protection and other functions.
As shown in fig. 3, the first main transformer protection device TM1 and the first line protection device LP1 are respectively connected to the bus protection device 87B/50BF, and specifically include: one end TD of a normally open contact of a first tripping relay K1 in the first main transformer protection device TM 1: 1 is connected to a first input terminal DI:1 of the bus bar protection device 87B/50BF, and the other end TD:2 is connected to a second input terminal DI:2 of the bus bar protection device; one end TD:1 of a normally open contact of the second tripping relay K2 in the first line protection device LP1 is connected with a third input terminal DI:3 of the bus protection device 87B/50BF, the other end TD:2 is connected with a fourth input terminal DI:4 of the bus protection device 87B/50BF, and the first tripping relay K1 and the second tripping relay K2 are used for tripping the first breaker DL 1.
The circuit is as follows: when the first breaker DL1 is started to trip through the first tripping relay K1, the first main transformer protection device TM1 inputs corresponding tripping signals to the first input terminal DI:1 and the second input terminal DI:2 of the bus protection device 87B/50BF through normally open contacts at the same time, the bus protection device 87B/50BF knows that the first breaker DL1 is started according to the tripping signals of the first input terminal DI:1 and the second input terminal DI:2, then judges whether the tripping is successful according to the current on the corresponding line, and if not, judges that the first breaker DL1 fails. When the first breaker DL1 is started to trip through the second trip relay K2, the first line protection device LP1 inputs corresponding trip signals to the third input terminal DI:3 and the fourth input terminal DI:4 of the bus protection device 87B/50BF through normally open contacts at the same time, the bus protection device 87B/50BF knows that the tripped first breaker DL1 is started according to the trip signals of the third input terminal DI:3 and the fourth input terminal DI:4, then whether the first breaker DL1 is tripped successfully is judged according to the current on the corresponding line, and if not, the first breaker DL1 is judged to be out of order.
If it is determined that the first breaker DL1 fails, the operation boxes of the first to third output trip contacts T1 to DL3 are controlled, and the first output terminal DO of the first output trip contact T1: 1 and second output terminal DO: 2 to the first control terminal TD in the trip circuit of the third circuit breaker DL3, respectively: 1 and a second control terminal TD: 2 to trip the third breaker DL 3; and simultaneously controlling a second output trip contact T2 to a third output terminal DO of the first main transformer protection device TM1, the second output trip contact T2: 3 and fourth output terminal DO: 4 respectively to a first control terminal DI in a first main transformer protection device TM 1: 1 and second control terminal DI:2, the main transformer tripping device is used for tripping the circuit breaker on the main transformer low-voltage side of the TM1 in an interlocking manner.
As shown in fig. 4, the second main transformer protection device TM2 and the second line protection device LP2 are respectively connected to the bus protection device 87B/50BF, and specifically include: one end TD:1 of a normally open contact of a third tripping relay K3 in the second main transformer protection device TM2 is connected with a fifth input terminal DI:5 of the bus protection device 87B/50BF, and the other end TD:2 is connected with a sixth input terminal DI:6 of the bus protection device 87B/50 BF; one end TD:1 of a normally open contact of a fourth tripping relay K4 in the second line protection device LP2 is connected with a seventh input terminal DI:7 of the bus protection device 87B/50BF, the other end TD:2 is connected with an eighth input terminal DI:8 of the bus protection device 87B/50BF, and the third tripping relay K3 and the fourth tripping relay K4 are used for tripping a second breaker DL 2.
The circuit is as follows: when the second breaker DL2 is tripped by the third tripping relay K3, the second main transformer protection device TM2 inputs corresponding tripping signals to the fifth input terminal DI:5 and the sixth input terminal DI:6 of the bus protection device 87B/50BF through the normally open contacts, the bus protection device 87B/50BF knows that the second breaker DL2 is tripped according to the tripping signals of the fifth input terminal DI:5 and the sixth input terminal DI:6, and then judges whether the tripping is successful according to the current on the corresponding line, and if not, judges that the second breaker DL2 fails. When the second breaker DL2 is started to trip through the fourth trip relay K4, the second line protection device LP2 inputs corresponding trip signals to a seventh input terminal DI:7 and an eighth input terminal DI:8 of the bus protection device 87B/50BF through normally open contacts at the same time, the bus protection device 87B/50BF knows that the tripped second breaker DL2 is started according to the trip signals of the seventh input terminal DI:7 and the eighth input terminal DI:8, then judges whether the second breaker DL2 is tripped successfully according to the current on a corresponding line, and if not, judges that the second breaker DL2 is out of order.
If the second breaker DL2 is judged to be failed, the third output trip contact T3 is controlled to an operation box of the third breaker DL3, and the fifth output terminal DO of the third output trip contact T3 is controlled: 5 and sixth output terminal DO: 6 to a third control terminal TD in the trip circuit of the third circuit breaker DL3 respectively: 3 and fourth control terminal TD: 4 to trip the third breaker DL 3; and simultaneously controlling the fourth output trip contact T4 to the seventh output terminal DO of the second main transformer protection device TM2, the fourth output trip contact T4: 7 and eighth output terminal DO: 8 are respectively connected to a first control terminal DI in a second main transformer protection device TM 2: 1 and second control terminal DI: 2, the main transformer tripping device is used for tripping the circuit breaker on the main transformer low-voltage side of the TM2 in an interlocking manner.
As shown in fig. 5, the first main transformer protection device TM1 and the second main transformer protection device TM2 are respectively connected with the bus protection device 87B/50BF, and specifically further include: one end TD:3 of a normally open contact of a fifth tripping relay K5 in the first main transformer protection device TM1 is connected with a ninth input terminal DI:9 of the bus protection device 87B/50BF, and the other end TD:4 is connected with a tenth input terminal DI:10 of the bus protection device 87B/50 BF; one end TD:3 of a normally open contact of a sixth tripping relay K6 of the second main transformer protection device TM2 is connected with an eleventh input terminal DI:11 of the bus protection device 87B/50BF, the other end TD:4 is connected with a twelfth input terminal DI:12 of the bus protection device 87B/50BF, and the fifth tripping relay K5 and the sixth tripping relay K6 are used for tripping the third relay DL 3.
The circuit is as follows: when the third breaker DL3 is started to trip through the fifth tripping relay K5, the first main-transformer protection device TM1 inputs corresponding tripping signals to the ninth input terminal DI:9 and the tenth input terminal DI:10 of the bus protection device 87B/50BF through normally open contacts, the bus protection device 87B/50BF knows that the tripping of the third breaker DL3 is started according to the tripping signals of the ninth input terminal DI:9 and the tenth input terminal DI:10, then whether the tripping of the third breaker DL3 is successful or not is judged according to the current on a corresponding line, and if not, the third breaker DL3 is judged to be failed. When the third breaker DL3 is started to trip through the sixth trip relay K6, the second line protection device LP2 inputs corresponding trip signals to an eleventh input terminal DI:11 and a twelfth input terminal DI:12 of the bus protection device 87B/50BF through normally open contacts, the bus protection device 87B/50BF knows that the tripped third breaker DL3 is started according to the trip signals of the eleventh input terminal DI:11 and the twelfth input terminal DI:12, then judges whether the tripping of the third breaker DL3 is successful according to the current on a corresponding line, and if not, judges that the third breaker DL3 fails.
If the third circuit breaker DL3 is determined to be malfunctioning, the fifth output trip contact T5 is controlled to the first main transformer protection device TM1, and the ninth output terminal DO of the fifth output trip contact T5 is: 9 and tenth output terminal DO: 10 are respectively connected to a third control terminal TD in a first main transformer protection device TM 1: 3 and fourth control terminal TD: 4, tripping off a circuit breaker on the main transformer low-voltage side of the TM1 in a linkage manner; and simultaneously controlling a sixth output trip contact T6 to the second main transformer protection device TM2, the eleventh output terminal DO of the sixth output trip contact T6: 11 and twelfth output terminal DO: 12 are respectively connected to a third control terminal DI in a second main transformer protection TM 2: 3 and fourth control terminal DI: 4, the main transformer trip-out circuit breaker of TM2 is used for linkage tripping.
In this embodiment, when the first breaker DL1 and the second breaker DL2 are tripped in line protection, the first breaker DL1 and the second breaker DL2 both trip the opposite-side breaker of the line at the same time; when the main transformer protection or bus protection trips the first circuit breaker DL1 and the second circuit breaker DL2, the opposite-side circuit breaker can be tripped in a combined mode, so that when the bus protection judges that the first circuit breaker DL1 and the second circuit breaker DL2 are out of order, signals of tripping the circuit opposite-side circuit breaker are not sent any more.
To sum up, this embodiment regards the internal bridge connection as a special single bus-section connection for the connection form of the internal bridge connection, that is, the single bus-section connection without the circuit breaker on the high-voltage side of the main transformer, and adopts the scheme of protecting the internal bridge connection by the bus bar, and this scheme only needs to configure one set of bus bar protection, which can reduce the configuration of three sets of circuit breaker protection, not only save the equipment investment, but also simplify the secondary connection, reduce the field construction amount and the subsequent operation and maintenance workload, and greatly improve the operation reliability of the system.
Claims (7)
1. A relay protection circuit for interior bridging line transformer substation, the transformer substation is equipped with I section generating line and II section generating lines, it has first circuit breaker and first transformer to connect on the I section generating line, it has second circuit breaker and second transformer to connect on the II section generating line, connects through the third circuit breaker between I section generating line and the II section generating line, first circuit breaker is connected with first transformer substation through first circuit, the second circuit breaker passes through the second circuit and is connected with the second transformer substation, its characterized in that still includes: bus bar protection device, first transformer is equipped with first main protection device that becomes, the second transformer is equipped with the second and becomes protection device, first circuit breaker is equipped with first line protection device, the second circuit breaker is equipped with second line protection device, first main protection device, second main protection device, first line protection device and second line protection device are connected with bus bar protection device respectively, bus bar protection device still is connected with the control terminal of third circuit breaker, first transformer low pressure side circuit breaker and second transformer low pressure side circuit breaker respectively.
2. The relay protection circuit for an inter-bridging substation of claim 1, wherein the first main transformer protection device and the first line protection device are connected to a bus protection device, respectively, specifically comprising:
One end of a normally open contact of a first tripping relay in the first main transformer protection device is connected with a first input terminal of the bus protection device, and the other end of the normally open contact of the first tripping relay is connected with a second input terminal of the bus protection device; one end of a normally open contact of a second tripping relay in the first circuit protection device is connected with a third input terminal of the bus protection device, the other end of the normally open contact of the second tripping relay is connected with a fourth input terminal of the bus protection device, and the first tripping relay and the second tripping relay are used for tripping the first circuit breaker.
3. The relay protection circuit for an inter-bridged substation of claim 2, wherein the bus protection device is further connected to control terminals of the third circuit breaker and the first transformer low-voltage side circuit breaker, respectively, specifically comprising:
a first output terminal of a first output tripping contact of the bus protection device is connected with a first control terminal of a third circuit breaker, and a second output terminal of the first output tripping contact is connected with a second control terminal of the third circuit breaker; and a third output terminal of a second output tripping contact of the bus protection device is connected with a first control terminal of the first main transformer protection device, and a fourth output terminal of the second output tripping contact is connected with a second control terminal of the first main transformer protection device.
4. The relay protection circuit for an inter-bridging substation of claim 1, wherein the second main transformer protection device and the second line protection device are connected to a bus protection device, respectively, specifically comprising:
one end of a normally open contact of a third tripping relay in the second main transformer protection device is connected with a fifth input terminal of the bus protection device, and the other end of the normally open contact of the third tripping relay is connected with a sixth input terminal of the bus protection device; and one end of a normally open contact of a fourth tripping relay in the second line protection device is connected with a seventh input terminal of the bus protection device, the other end of the normally open contact of the fourth tripping relay is connected with an eighth input terminal of the bus protection device, and the third tripping relay and the fourth tripping relay are used for tripping a second circuit breaker.
5. The relay protection circuit for an internal bridging substation of claim 4, wherein the bus protection device is further connected to control terminals of a third circuit breaker and a second transformer low-voltage side circuit breaker respectively, and specifically comprises:
a fifth output terminal of a third output tripping contact of the bus protection device is connected with a third control terminal of a third relay, and a sixth output terminal of the third output tripping contact is connected with a fourth control terminal of the third relay; and a seventh output terminal of a fourth output tripping contact of the bus protection device is connected with a first control terminal of a second main transformer protection device, and an eighth output terminal of the fourth output tripping contact is connected with a second control terminal of the second main transformer protection device.
6. The relay protection circuit for an internal bridging substation of claim 1, wherein the first main transformer protection device and the second main transformer protection device are connected with a bus protection device respectively, and further comprising:
one end of a normally open contact of a fifth tripping relay in the first main transformer protection device is connected with a ninth input terminal of the bus protection device, and the other end of the normally open contact of the fifth tripping relay is connected with a tenth input terminal of the bus protection device; one end of a normally open contact of a sixth tripping relay of the second main transformer protection device is connected with an eleventh input terminal of the bus protection device, the other end of the normally open contact of the sixth tripping relay of the second main transformer protection device is connected with a twelfth input terminal of the bus protection device, and the fifth tripping relay and the sixth tripping relay are used for tripping the third relay.
7. The relay protection circuit for an inter-bridged substation of claim 6, wherein the bus bar protection device is further connected to control terminals of the first transformer low-voltage side circuit breaker and the second transformer low-voltage side circuit breaker, respectively, specifically comprising:
a ninth output terminal of a fifth output tripping contact of the bus protection device is connected with a third control terminal of the first main transformer protection device, and a tenth output terminal of the fifth output tripping contact is connected with a fourth control terminal of the first main transformer protection device; an eleventh output terminal of a sixth output tripping contact of the bus protection device is connected with a third control terminal of the second main transformer protection device, and a twelfth output terminal of the sixth output tripping contact is connected with a fourth control terminal of the second main transformer protection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220004561.9U CN216625292U (en) | 2022-01-04 | 2022-01-04 | Relay protection circuit for internal bridging transformer substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220004561.9U CN216625292U (en) | 2022-01-04 | 2022-01-04 | Relay protection circuit for internal bridging transformer substation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216625292U true CN216625292U (en) | 2022-05-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220004561.9U Active CN216625292U (en) | 2022-01-04 | 2022-01-04 | Relay protection circuit for internal bridging transformer substation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216625292U (en) |
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2022
- 2022-01-04 CN CN202220004561.9U patent/CN216625292U/en active Active
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