CN108063491B - Cooling control system of forced oil circulation air-cooled transformer - Google Patents
Cooling control system of forced oil circulation air-cooled transformer Download PDFInfo
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- CN108063491B CN108063491B CN201810000288.0A CN201810000288A CN108063491B CN 108063491 B CN108063491 B CN 108063491B CN 201810000288 A CN201810000288 A CN 201810000288A CN 108063491 B CN108063491 B CN 108063491B
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- 238000001816 cooling Methods 0.000 title claims abstract description 18
- 238000012544 monitoring process Methods 0.000 claims abstract description 59
- 238000007689 inspection Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/085—Cooling by ambient air
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Transformers (AREA)
- Relay Circuits (AREA)
Abstract
The invention provides a cooling control system of a forced-oil circulation air-cooled transformer, which is used for solving the technical problem that the cooling control system of the forced-oil circulation air-cooled transformer in the prior art cannot accurately detect the adhesion failure of a power contactor. Comprising the following steps: the input end of the power supply monitoring loop is connected with the I-section power supply and the II-section power supply respectively, and the output end of the power supply monitoring loop is connected with the cooler; the power supply switching circuit is connected with the power supply monitoring circuit and is used for controlling the switching of the I-section power supply and the II-section power supply through controlling the power supply monitoring circuit; the power supply switching relay loop is respectively connected with the power supply monitoring loop and the power supply switching loop; the fault signal indication loop is respectively connected with the power switching relay loop and the power switching loop. Compared with the prior art, the invention can accurately judge the power failure, and the power switching loop is added, so that the power switching is more stable, the failure signal is enriched, and the inspection and operation of operators are facilitated.
Description
Technical Field
The invention belongs to the technical field of transformer cooling, and particularly relates to a cooling control system of a strong oil circulation air-cooled transformer.
Background
In order to ensure normal operation of the transformer, cooling equipment is needed to assist the operation of the transformer, and most of the cooling equipment of the existing large-scale transformer is a forced oil circulation air cooler. In order to avoid faults of the power supply in the using process, the existing air cooler adopts two sections of power supplies to supply power, one section is standby, the other section works, and when one section fails, the other section can be put into operation. However, in the existing air-cooling control system, when the main contactor of the power supply has an internal adhesion fault, the system cannot judge the fault, so that the voltage output to the cooler has the problems of phase failure, overvoltage and undervoltage, and damage is caused to the cooler; meanwhile, the switching circuit of the two sections of power supplies is single, if faults occur, the switching of the power supplies is influenced, and then the normal operation of the cooler and the transformer is influenced; in addition, when the main contactor of the power supply fails, the failure monitoring signal is not clear, and the operation of operators is inconvenient, so a new cooling control system of the forced oil circulation air-cooled transformer is needed.
Disclosure of Invention
The invention provides a cooling control system of a forced-oil circulation air-cooled transformer, which aims to solve the technical problem that a cooling control system of the forced-oil circulation air-cooled transformer in the prior art cannot accurately monitor adhesion faults of a power contactor.
In order to solve the technical problems, the cooling control system of the forced oil circulation air-cooled transformer provided by the invention comprises:
the system comprises: the input end of the power supply monitoring loop is connected with the I-section power supply and the II-section power supply respectively, and the output end of the power supply monitoring loop is connected with the cooler; the power supply switching circuit is connected with the power supply monitoring circuit and is used for controlling the switching of the I-section power supply and the II-section power supply through controlling the power supply monitoring circuit; the power supply switching relay loop is respectively connected with the power supply monitoring loop and the power supply switching loop; the fault signal indication loop is respectively connected with the power supply switching relay loop and the power supply switching loop; wherein, power monitoring loop includes: the I-section power supply lines L1, L2 and L3 are sequentially connected with a first air switch QF1, a coil of a first power supply monitoring relay KX1 and a normally open contact of an I-section power supply main contactor KMM1 in a bridging manner; the II-stage power supply wires L4, L5 and L6 are sequentially connected with a second air switch QF2, a coil of a second power supply monitoring relay KX2 and a normally open contact of a II-stage power supply main contactor KMM2 in a bridging manner; and the input end of the coil of the bus voltage monitoring relay KX3 is connected with the normally open contact output end of the I-section power main contactor KMM1 and the normally open contact output end of the II-section power main contactor KMM2, and the output end is connected with the cooler.
Preferably, the power supply switching circuit includes:
the input ends of the I-section power supply automatic control loop and the I-section bus voltage open-phase protection loop are connected with a live wire L1 of the I-section power supply through a first fuse 1FU, and the output ends of the I-section power supply automatic control loop and the I-section bus voltage open-phase protection loop are connected with a zero line N;
the input ends of the automatic control loop of the II-section power supply and the phase-failure protection loop of the II-section bus voltage are connected with a live wire L4 of the II-section power supply through a second fuse 2FU, and the output ends of the automatic control loop and the phase-failure protection loop of the II-section bus voltage are connected with a zero line N;
the I section power supply automatic control loop includes:
the input end of the first branch is connected with the output end of the first fuse 1FU through the contacts (3) - (4) of the change-over switch CK1, and the output end is connected with the zero line N; comprising the following steps: the normally open contact of the second intermediate relay K2 and the normally closed contact of the II-stage power supply main contactor KMM2 are sequentially connected;
the input end of the second branch is connected with the output end of the first fuse 1FU through the contacts (5) - (6) of the change-over switch CK1, and the output end of the second branch is connected with the second branch; comprising the following steps: the normally open contact of the first intermediate relay K1, the normally closed contact of the ninth intermediate relay K9 and the coil of the I-section power supply main contactor KMM1 are sequentially connected; the connection point of the output end of the coil of the I-section power supply main contactor KMM1 and the first branch is arranged between the normally closed contact of the II-section power supply main contactor KMM2 and the normally open contact of the second intermediate relay K2;
the I section power supply automatic control loop also comprises: the normally closed contact of the second intermediate relay K2 and the normally open contact of the tenth intermediate relay K10 are connected with the input end of the normally open contact of the second intermediate relay K2 in the first branch, and the output end is connected with the input end of the normally open contact of the first intermediate relay K1;
the I section bus voltage open-phase protection loop comprises: the first power supply monitoring relay KX1 normally open contact and the first intermediate relay K1 coil are connected in sequence;
the automatic control loop of the II-stage power supply comprises:
the input end of the third branch is connected with the output end of the second fuse 2FU through the (9) -contact of the change-over switch CK1, and the output end is connected with the zero line N; comprising the following steps: the normally open contact of the first intermediate relay K1 and the normally closed contact of the I-section power supply main contactor KMM1 are sequentially connected; the normally open contact of the first intermediate relay K1 and the normally closed contact of the I-section power supply main contactor KMM1 are sequentially connected; the input end of the fourth branch is connected with the output end of the second melter 2FU through the contacts (7) - (8) of the transfer switch CK1, and the output end of the fourth branch is connected with the third branch; comprising the following steps: the normally open contact of the second intermediate relay K2, the normally closed contact of the tenth intermediate relay K10 and the coil of the II-stage power main contactor KMM2 are sequentially connected; the connection point of the output end of the coil of the II-section power supply main contactor KMM2 and the third branch is arranged between the normally closed contact of the I-section power supply main contactor KMM1 and the normally open contact of the first intermediate relay K1;
the automatic control loop of the II-stage power supply further comprises: the normally closed contact of the first intermediate relay K1 and the normally open contact of the ninth intermediate relay K9 are respectively connected with the normally open contact input end of the first intermediate relay K1 in the third branch, and the output end is respectively connected with the normally open contact input end of the second intermediate relay K2;
the phase-failure protection circuit for the II-section bus voltage comprises: the second power monitoring relay KX2 normally open contact and the second intermediate relay K2 coil are connected in sequence;
the power switching relay circuit includes: the input end of the I-section main contactor fault signal manual reset loop and the II-section main contactor fault signal manual reset loop are connected with the positive electrode (+ KM) of a direct current power line through a third fuse 3FU and a third air switch QM3 positive electrode which are sequentially connected in series, and the output end of the I-section main contactor fault signal manual reset loop and the II-section main contactor fault signal manual reset loop are connected with the negative electrode (-KM) of the direct current power line through a fourth fuse 4FU and a third air switch QM3 negative electrode which are sequentially connected in series;
the manual reset loop of I section main contactor fault signal includes:
a first parallel loop comprising: the normally open contact of the I-section power supply main contactor KMM1, the normally closed contact of the bus voltage monitoring relay KX3 and the coil of the sixth delay relay KT6 are sequentially connected;
a second parallel loop comprising: the sixth delay relay KT6 normally open contact and the ninth intermediate relay K9 coil are sequentially connected; the ninth intermediate relay K9 normally open contact and the first normally closed button SB1 are connected in sequence; the input end of the normally open contact of the ninth intermediate relay K9 is connected with the input end of the normally open contact of the sixth delay relay KT 6; the output end of the first normally closed button SB1 is connected with the output end of a normally open contact of a sixth delay relay KT 6;
the first parallel loop and the second parallel loop are arranged in parallel;
the manual return circuit that resets of II section main contactor fault signal includes:
a third parallel loop comprising: the normally open contact of the II-section power supply main contactor KMM2, the normally closed contact of the busbar voltage monitoring relay KX3 and the coil of the seventh delay relay KT7 are sequentially connected;
a fourth parallel loop comprising: the normally open contact of the seventh delay relay KT7 and the coil of the tenth intermediate relay K10 are sequentially connected; the tenth intermediate relay K10 normally open contact and the second normally closed button SB2 are connected in sequence; the normally open contact input end of the tenth intermediate relay K10 is connected with the normally open contact input end of the seventh delay relay KT 7; the output end of the second normally closed button SB2 is connected with the output end of a normally open contact of a seventh delay relay KT 7;
the third parallel loop and the fourth parallel loop are arranged in parallel.
Preferably, the first branch further includes: the coil of the first delay relay KT1 is arranged between a normally open contact of the second intermediate relay K2 and a normally closed contact of the II-section power supply main contactor KMM 2; the output end of the first delay relay KT1 coil is connected with the output end of the second branch;
the I section power supply automatic control loop also comprises: the input end of the seventh intermediate relay K7 normally open contact is connected with the input end of the second intermediate relay K2 normally open contact, and the output end of the seventh intermediate relay K7 normally open contact is connected with the input end of the first intermediate relay K1 normally open contact;
the power switching relay circuit further includes: the I section main contactor trouble rescue return circuit, with parallelly connected setting of first parallel return circuit includes: the coil of the normally open contact of the delay relay KT2 and the coil of the intermediate relay K8 are sequentially connected;
the third branch circuit further comprises: the coil of the second delay relay KT2 is arranged between the normally open contact of the first intermediate relay K1 and the normally closed contact of the I-section power supply main contactor KMM 1; the output end of the second delay relay KT2 coil is connected with the output end of the fourth branch;
the automatic control loop of the II-stage power supply further comprises: the input end of the eighth intermediate relay K8 normally open contact is connected with the input end of the first intermediate relay K1 normally open contact, and the output end of the eighth intermediate relay K8 normally open contact is connected with the input end of the second intermediate relay K2 normally open contact;
the power switching relay circuit further includes: the II section main contactor trouble rescue return circuit, with the parallelly connected setting of third parallel circuit includes: the normally open contact of the delay relay KT1 and the coil of the intermediate relay K7 are sequentially connected.
Preferably, the fault signal indication loop is arranged in parallel with the first parallel loop, and includes:
the I section power failure indication loop includes: the normally closed contact of the first intermediate relay K1 and the third indicator lamp RD3 are connected in sequence;
a section II power failure indication circuit comprising: the second intermediate relay K2 normally closed contact and the fourth indicator lamp RD4 are connected in sequence;
the I section main contactor fault indication loop comprises: the eighth intermediate relay K8 normally open contact and the fifth indicator lamp RD5 are connected in sequence; a normally open contact of the ninth intermediate relay K9 is connected with a normally open contact of the eighth intermediate relay K8 in parallel;
a section II main contactor fault indication loop comprising: the seventh intermediate relay K7 normally open contact and the sixth indicator lamp RD6 are connected in sequence; the tenth intermediate relay K10 normally open contact is arranged in parallel with the seventh intermediate relay K7 normally open contact.
Preferably, the change-over switch CK1 is a manual change-over switch, when the switch is turned to the left I gear, (5) - (6) contacts and (9) -roller contacts are closed, the two power supplies are in the state of working as the I power supply, and the II power supply is for standby; when the gear is turned to the right II, the contacts (3) - (4) and the contacts (7) - (8) are closed, the two-section power supply is in a state of I-section power supply for standby, and the II-section power supply works.
Preferably, the first normally closed button SB1 and the second normally closed button SB2 are manual self-resetting buttons.
The beneficial effects of the invention include:
compared with the prior art, the scheme provided by the invention has the advantages that the bus voltage monitoring relay KX3 is arranged below the main contactors of the two-section power supply, so that the bus voltage can act when becoming high, low or phase failure occurs, and further, the main contactors of the two-section power supply can be accurately judged to have faults; the power supply switching loop and the power supply switching relay loop are improved, when one section of power supply fails and needs to be switched to the other section of power supply, the switching loop is added, so that the switching is more reliable, the risk is reduced, and the control stability is improved; meanwhile, fault signals are enriched, and the operation personnel can check and operate conveniently.
Drawings
In the drawings:
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic diagram of the structure of the power supply monitoring circuit and the power supply switching circuit according to the present invention;
fig. 3 is a schematic structural diagram of a power switching relay circuit and a fault signal indicating circuit in the present invention.
Reference numerals illustrate: 1: a power supply monitoring circuit; 2: a power supply switching circuit; 3: a power switching relay circuit; 4, a fault signal indication loop; QF1: a first air switch; QF2 second air switch; 1FU: a first fuse; 2FU second fuse; 3FU: a third fuse; 4FU: a fourth fuse; QM3: a third air switch; +km, -KM: a direct current power line positive electrode and a direct current power line negative electrode; KX1: a first power supply monitoring relay; KX2: a second power supply monitoring relay; KX3: bus voltage monitoring relay; KMM1: a section I power supply main contactor; KMM2: a section II power supply main contactor; k1: a first intermediate relay; k2: a second intermediate relay; k7: a seventh intermediate relay; and K8: an eighth intermediate relay; k9: a ninth intermediate relay; k10: a tenth intermediate relay; KT1: a first delay relay; KT2: a second delay relay; KT6: a sixth delay relay; KT7: a seventh delay relay; SB1: a first normally closed button; SB2: a second normally closed button; RD3: a third indicator light; RD4: a fourth indicator light; RD5: a fifth indicator light; RD6: a sixth indicator light; CK1: and a change-over switch.
Detailed Description
The invention will now be described in detail with reference to the accompanying drawings, in which specific embodiments thereof are shown.
Referring to fig. 1 and 2, the cooling control system of the forced oil circulation air-cooled transformer provided in this embodiment includes: the input end of the power supply monitoring loop 1 is respectively connected with the I-section power supply and the II-section power supply, and the output end of the power supply monitoring loop is connected with the cooler; the power supply switching circuit 2 is connected with the power supply monitoring circuit 1, and the switching of the I-section power supply and the II-section power supply is controlled by controlling the power supply monitoring circuit 1; a power supply switching relay circuit 3 connected to the power supply monitoring circuit 1 and the power supply switching circuit 2, respectively; the fault signal indication loop 4 is respectively connected with the power switching relay loop 3 and the power switching loop 2; wherein, power monitoring circuit 1 includes: the I-section power supply lines L1, L2 and L3 are sequentially connected with a first air switch QF1, a coil of a first power supply monitoring relay KX1 and a normally open contact of an I-section power supply main contactor KMM1 in a bridging manner; the II-stage power supply wires L4, L5 and L6 are sequentially connected with a second air switch QF2, a coil of a second power supply monitoring relay KX2 and a normally open contact of a II-stage power supply main contactor KMM2 in a bridging manner; and the input end of the coil of the bus voltage monitoring relay KX3 is connected with the normally open contact output end of the I-section power main contactor KMM1 and the normally open contact output end of the II-section power main contactor KMM2, and the output end is connected with the cooler. The first power supply monitoring relay KX1 is arranged, and the second power supply monitoring relay KX2 is arranged, so that the current quality of the incoming call side can be monitored; and the bus voltage monitoring relay KX3 is arranged below the two sections of power supply main contactors, can monitor the current quality at the lower side after the two sections of power supply main contactors are closed, and judges faults through monitoring the open-phase voltage, the high voltage or the low voltage of the voltage when the control of the I, II sections of power supply main contactors fails or the contactors fail.
Referring to fig. 2 and 3, the power switching circuit 2 preferably includes:
the input ends of the I-section power supply automatic control loop and the I-section bus voltage open-phase protection loop are connected with a live wire L1 of the I-section power supply through a first fuse 1FU, and the output ends of the I-section power supply automatic control loop and the I-section bus voltage open-phase protection loop are connected with a zero line N; the power supply is used for controlling the operation of the I-section power supply, and when the I-section power supply fails, the I-section power supply is switched to the II-section power supply to work.
The input ends of the automatic control loop of the II-section power supply and the phase-failure protection loop of the II-section bus voltage are connected with a live wire L4 of the II-section power supply through a second fuse 2FU, and the output ends of the automatic control loop and the phase-failure protection loop of the II-section bus voltage are connected with a zero line N; the power supply is used for controlling the operation of the II-section power supply, and when the II-section power supply fails, the I-section power supply is switched to work.
I section power automatic control return circuit includes:
the input end of the first branch is connected with the output end of the first fuse 1FU through the contacts (3) - (4) of the change-over switch CK1, and the output end is connected with the zero line N; comprising the following steps: the normally open contact of the second intermediate relay K2 and the normally closed contact of the II-stage power supply main contactor KMM2 are sequentially connected;
the input end of the second branch is connected with the output end of the first fuse 1FU through the contacts (5) - (6) of the change-over switch CK1, and the output end of the second branch is connected with the second branch; comprising the following steps: the normally open contact of the first intermediate relay K1, the normally closed contact of the ninth intermediate relay K9 and the coil of the I-section power supply main contactor KMM1 are sequentially connected; the connection point of the output end of the coil of the I-section power supply main contactor KMM1 and the first branch is arranged between the normally closed contact of the II-section power supply main contactor KMM2 and the normally open contact of the second intermediate relay K2;
i section power automatic control return circuit still includes: the normally closed contact of the second intermediate relay K2 and the normally open contact of the tenth intermediate relay K10 are connected with the input end of the normally open contact of the second intermediate relay K2 in the first branch, and the output end is connected with the input end of the normally open contact of the first intermediate relay K1;
the phase-failure protection circuit of I section busbar voltage includes: the first power supply monitoring relay KX1 normally open contact and the first intermediate relay K1 coil are connected in sequence;
II section power automatic control return circuit includes:
the input end of the third branch is connected with the output end of the second fuse 2FU through the (9) -contact of the change-over switch CK1, and the output end is connected with the zero line N; comprising the following steps: the normally open contact of the first intermediate relay K1 and the normally closed contact of the I-section power supply main contactor KMM1 are sequentially connected; the normally open contact of the first intermediate relay K1 and the normally closed contact of the I-section power supply main contactor KMM1 are sequentially connected; the input end of the fourth branch is connected with the output end of the second melter 2FU through the contacts (7) - (8) of the transfer switch CK1, and the output end of the fourth branch is connected with the third branch; comprising the following steps: the normally open contact of the second intermediate relay K2, the normally closed contact of the tenth intermediate relay K10 and the coil of the II-stage power main contactor KMM2 are sequentially connected; the connection point of the output end of the coil of the II-section power supply main contactor KMM2 and the third branch is arranged between the normally closed contact of the I-section power supply main contactor KMM1 and the normally open contact of the first intermediate relay K1;
II section power automatic control return circuit still includes: the normally closed contact of the first intermediate relay K1 and the normally open contact of the ninth intermediate relay K9 are respectively connected with the normally open contact input end of the first intermediate relay K1 in the third branch, and the output end is respectively connected with the normally open contact input end of the second intermediate relay K2;
the phase-failure protection circuit of the II section bus voltage comprises: the second power monitoring relay KX2 normally open contact and the second intermediate relay K2 coil are connected in sequence;
a power switching relay circuit 3 comprising: the input end of the I-section main contactor fault signal manual reset loop and the II-section main contactor fault signal manual reset loop are connected with the positive electrode (+ KM) of a direct current power line through a third fuse 3FU and a third air switch QM3 positive electrode which are sequentially connected in series, and the output end of the I-section main contactor fault signal manual reset loop and the II-section main contactor fault signal manual reset loop are connected with the negative electrode (-KM) of the direct current power line through a fourth fuse 4FU and a third air switch QM3 negative electrode which are sequentially connected in series;
the manual return circuit that resets of I section main contactor fault signal includes:
a first parallel loop comprising: the normally open contact of the I-section power supply main contactor KMM1, the normally closed contact of the bus voltage monitoring relay KX3 and the coil of the sixth delay relay KT6 are sequentially connected;
a second parallel loop comprising: the sixth delay relay KT6 normally open contact and the ninth intermediate relay K9 coil are sequentially connected; the ninth intermediate relay K9 normally open contact and the first normally closed button SB1 are connected in sequence; the input end of the normally open contact of the ninth intermediate relay K9 is connected with the input end of the normally open contact of the sixth delay relay KT 6; the output end of the first normally closed button SB1 is connected with the output end of a normally open contact of a sixth delay relay KT 6; the second parallel loop is a self-holding loop; the self-hold can be broken by manually opening the first normally closed button SB 1;
the first parallel loop and the second parallel loop are arranged in parallel;
the manual return circuit that resets of II section main contactor fault signal includes:
a third parallel loop comprising: the normally open contact of the II-section power supply main contactor KMM2, the normally closed contact of the busbar voltage monitoring relay KX3 and the coil of the seventh delay relay KT7 are sequentially connected;
a fourth parallel loop comprising: the normally open contact of the seventh delay relay KT7 and the coil of the tenth intermediate relay K10 are sequentially connected; the tenth intermediate relay K10 normally open contact and the second normally closed button SB2 are connected in sequence; the normally open contact input end of the tenth intermediate relay K10 is connected with the normally open contact input end of the seventh delay relay KT 7; the output end of the second normally closed button SB2 is connected with the output end of a normally open contact of a seventh delay relay KT 7; the fourth parallel loop is a self-holding loop; the self-hold can be broken by manually opening the second normally closed button SB 2;
the third parallel circuit is arranged in parallel with the fourth parallel circuit.
Referring to fig. 2 and 3, preferably, the first branch further includes: the coil of the first delay relay KT1 is arranged between a normally open contact of the second intermediate relay K2 and a normally closed contact of the II-section power supply main contactor KMM 2; the output end of the first delay relay KT1 coil is connected with the output end of the second branch;
i section power automatic control return circuit still includes: the input end of the seventh intermediate relay K7 normally open contact is connected with the input end of the second intermediate relay K2 normally open contact, and the output end of the seventh intermediate relay K7 normally open contact is connected with the input end of the first intermediate relay K1 normally open contact;
the power switching relay circuit 3 further includes: the I section main contactor trouble rescue return circuit, with parallelly connected setting of first parallel return circuit includes: the coil of the normally open contact of the delay relay KT2 and the coil of the intermediate relay K8 are sequentially connected;
the third branch circuit, still include: the coil of the second delay relay KT2 is arranged between the normally open contact of the first intermediate relay K1 and the normally closed contact of the I-section power supply main contactor KMM 1; the output end of the second delay relay KT2 coil is connected with the output end of the fourth branch;
II section power automatic control return circuit still includes: the input end of the eighth intermediate relay K8 normally open contact is connected with the input end of the first intermediate relay K1 normally open contact, and the output end of the eighth intermediate relay K8 normally open contact is connected with the input end of the second intermediate relay K2 normally open contact;
the power switching relay circuit 3 further includes: the II section main contactor trouble rescue return circuit, with the parallelly connected setting of third parallel circuit includes: the normally open contact of the delay relay KT1 and the coil of the intermediate relay K7 are sequentially connected.
Referring to fig. 3, preferably, the fault signal indication loop 4 is disposed in parallel with the first parallel loop, and includes:
the I section power failure indication loop includes: the normally closed contact of the first intermediate relay K1 and the third indicator lamp RD3 are connected in sequence;
a section II power failure indication circuit comprising: the second intermediate relay K2 normally closed contact and the fourth indicator lamp RD4 are connected in sequence;
the I section main contactor fault indication loop comprises: the eighth intermediate relay K8 normally open contact and the fifth indicator lamp RD5 are connected in sequence; a normally open contact of the ninth intermediate relay K9 is connected with a normally open contact of the eighth intermediate relay K8 in parallel;
a section II main contactor fault indication loop comprising: the seventh intermediate relay K7 normally open contact and the sixth indicator lamp RD6 are connected in sequence; the tenth intermediate relay K10 normally open contact is arranged in parallel with the seventh intermediate relay K7 normally open contact.
Referring to fig. 2, preferably, the change-over switch CK1 is a manual change-over switch, when the switch is turned to the left I gear, (5) - (6) contacts and (9) -contacts are closed, the two power supplies are in the state of I power supply work, and II power supply is reserved; when the gear is turned to the right II, the contacts (3) - (4) and the contacts (7) - (8) are closed, the two-section power supply is in a state of I-section power supply for standby, and the II-section power supply works.
Referring to fig. 3, the first and second normally closed buttons SB1 and SB2 are preferably manual self-resetting buttons.
The operation and principle of an embodiment of the present invention will be described with reference to fig. 2 and 3:
firstly, a first air switch QF1 and a second air switch QF2 are closed, a section I power supply and a section II power supply are put into, a first power supply monitoring relay KX1 coil is electrified, a second power supply monitoring relay KX2 coil is electrified, a KX1 normally open contact and a KX2 normally open contact in a power supply switching loop are closed, and further the K1 coil and the K2 coil are electrified to cause the K1 normally open contact and the K2 normally open contact to be closed, and a K1 normally closed contact and a K2 normally closed contact are opened to prepare for the attraction of a KMM1 coil or a KMM2 coil;
switching the change-over switch CK1 to a left I gear, enabling an I-stage power supply to work, enabling a II-stage power supply to stand by, closing (5) - (6) contacts and (9) -d contacts, powering a KMM1 coil, closing a KMM1 normally open contact in a power supply monitoring loop, and enabling the II-stage power supply to supply power for a cooler;
when the I-section power supply main contactor KMM1 has adhesion faults, voltage phase interruption is caused, or voltage rises or falls, KX3 can detect voltage transformation and then power failure, a loop is manually reset through a fault signal of the I-section main contactor, a coil of a delay relay KT6 is started, a K9 coil is further started, a K9 normally open contact in a II-section power supply automatic control loop is closed, a KMM2 coil is electrified, a KMM2 normally open contact is closed, a II-section power supply is put into operation, power is supplied to a cooler, and automatic power supply switching is completed; meanwhile, KT2 is arranged, when KMM1 fails, KT2 is started, and then a K8 coil is electrified through a failure rescue loop of the I-section main contactor, then a K8 normally open contact in a II-section power supply automatic control loop is closed, and the K8 normally open contact and a K9 normally open contact form two paths of power supply switching channels, so that switching risks are reduced, and switching is more reliable;
when KMM1 fails, a second parallel circuit in the I-section main contactor fault signal manual reset circuit forms a self-holding circuit, if the KMM1 does not fail and only power supply switching is caused by unstable voltage after inspection, the self-holding circuit can be disconnected by manually opening a first normally closed button SB1, at the moment, K9 is powered off, a K9 normally open contact is opened in a II-section power supply automatic control circuit, and a KMM2 coil is powered off; in the I-section power supply automatic control loop, a K9 normally closed contact is closed, and a KMM1 coil is electrified; the I-section power supply is powered on again, and the II-section power supply enters a standby state;
regarding fault signal indication, it is known through the I-section voltage open-phase protection loop that if the KX1 coil is powered off, the KX1 normally open contact is opened, so that the K1 coil is powered off, and further the K1 normally closed contact in the I-section power failure indication loop is closed, and the third indicator lamp RD3 is opened;
according to the phase-failure protection loop of the II-stage voltage, if the KX2 coil is powered off, the KX2 normally open contact is opened, so that the K2 coil is powered off, and further the K2 normally closed contact in the II-stage power failure indication loop is closed, and the fourth indicator lamp RD4 is opened;
according to the automatic control loop of the section II power supply, if the K8 normally open contact is closed or the K9 normally open contact is closed, the section II power supply is indicated to enter an operating state, the section I main contactor is indicated to have a fault, and therefore an RD5 indicator lamp in the fault indication loop of the section I main contactor is caused to be opened;
according to the automatic control loop of the I-section power supply, if the K7 normally open contact is closed or the K10 normally open contact is closed, the I-section power supply is indicated to enter an operating state, the II-section main contactor is indicated to fail, and therefore an RD6 indicator lamp in the failure indication loop of the II-section main contactor is caused to be opened.
In summary, compared with the prior art, according to the scheme provided by the embodiment of the invention, the bus voltage monitoring relay KX3 is arranged below the main contactors of the two-stage power supply, so that the operation can be performed when the bus voltage becomes high, low or a phase failure occurs, and the main contactors of the two-stage power supply can be accurately judged to have faults; the power supply switching loop and the power supply switching relay loop are improved, when one section of power supply fails and needs to be switched to the other section of power supply, the switching loop is added, so that the switching is more reliable, the risk is reduced, and the control stability is improved; meanwhile, fault signals are enriched, and the operation personnel can check and operate conveniently. .
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (3)
1. A forced oil circulation forced air cooling transformer cooling control system, characterized by comprising: the system comprises: the input end of the power supply monitoring loop is connected with the I-section power supply and the II-section power supply respectively, and the output end of the power supply monitoring loop is connected with the cooler; the power supply switching circuit is connected with the power supply monitoring circuit and is used for controlling the switching of the I-section power supply and the II-section power supply through controlling the power supply monitoring circuit; the power supply switching relay loop is respectively connected with the power supply monitoring loop and the power supply switching loop; the fault signal indication loop is respectively connected with the power supply switching relay loop and the power supply switching loop; wherein, power monitoring loop includes: the I-section power supply lines L1, L2 and L3 are sequentially connected with a first air switch QF1, a coil of a first power supply monitoring relay KX1 and a normally open contact of an I-section power supply main contactor KMM1 in a bridging manner; the II-stage power supply wires L4, L5 and L6 are sequentially connected with a second air switch QF2, a coil of a second power supply monitoring relay KX2 and a normally open contact of a II-stage power supply main contactor KMM2 in a bridging manner; the input end of the coil of the bus voltage monitoring relay KX3 is connected with the normally open contact output end of the I-section power main contactor KMM1 and the normally open contact output end of the II-section power main contactor KMM2, and the output end is connected with the cooler; the power supply switching circuit includes: the input ends of the I-section power supply automatic control loop and the I-section bus voltage open-phase protection loop are connected with a live wire L1 of the I-section power supply through a first fuse 1FU, and the output ends of the I-section power supply automatic control loop and the I-section bus voltage open-phase protection loop are connected with a zero line N; the input ends of the automatic control loop of the II-section power supply and the phase-failure protection loop of the II-section bus voltage are connected with a live wire L4 of the II-section power supply through a second fuse 2FU, and the output ends of the automatic control loop and the phase-failure protection loop of the II-section bus voltage are connected with a zero line N; the I section power supply automatic control loop includes: the input end of the first branch is connected with the output end of the first fuse 1FU through the contacts (3) - (4) of the change-over switch CK1, and the output end is connected with the zero line N; comprising the following steps: the normally open contact of the second intermediate relay K2 and the normally closed contact of the II-stage power supply main contactor KMM2 are sequentially connected; the input end of the second branch is connected with the output end of the first fuse 1FU through the contacts (5) - (6) of the change-over switch CK1, and the output end of the second branch is connected with the second branch; comprising the following steps: the normally open contact of the first intermediate relay K1, the normally closed contact of the ninth intermediate relay K9 and the coil of the I-section power supply main contactor KMM1 are sequentially connected; the connection point of the output end of the coil of the I-section power supply main contactor KMM1 and the first branch is arranged between the normally closed contact of the II-section power supply main contactor KMM2 and the normally open contact of the second intermediate relay K2; the I section power supply automatic control loop also comprises: the normally closed contact of the second intermediate relay K2 and the normally open contact of the tenth intermediate relay K10 are connected with the input end of the normally open contact of the second intermediate relay K2 in the first branch, and the output end is connected with the input end of the normally open contact of the first intermediate relay K1; the I section bus voltage open-phase protection loop comprises: the first power supply monitoring relay KX1 normally open contact and the first intermediate relay K1 coil are connected in sequence; the automatic control loop of the II-stage power supply comprises: the input end of the third branch is connected with the output end of the second fuse 2FU through the (9) -contact of the change-over switch CK1, and the output end is connected with the zero line N; comprising the following steps: the normally open contact of the first intermediate relay K1 and the normally closed contact of the I-section power supply main contactor KMM1 are sequentially connected; the normally open contact of the first intermediate relay K1 and the normally closed contact of the I-section power supply main contactor KMM1 are sequentially connected; the input end of the fourth branch is connected with the output end of the second melter 2FU through the contacts (7) - (8) of the transfer switch CK1, and the output end of the fourth branch is connected with the third branch; comprising the following steps: the normally open contact of the second intermediate relay K2, the normally closed contact of the tenth intermediate relay K10 and the coil of the II-stage power main contactor KMM2 are sequentially connected; the connection point of the output end of the coil of the II-section power supply main contactor KMM2 and the third branch is arranged between the normally closed contact of the I-section power supply main contactor KMM1 and the normally open contact of the first intermediate relay K1; the automatic control loop of the II-stage power supply further comprises: the normally closed contact of the first intermediate relay K1 and the normally open contact of the ninth intermediate relay K9 are respectively connected with the normally open contact input end of the first intermediate relay K1 in the third branch, and the output end is respectively connected with the normally open contact input end of the second intermediate relay K2; the phase-failure protection circuit for the II-section bus voltage comprises: the second power monitoring relay KX2 normally open contact and the second intermediate relay K2 coil are connected in sequence; the power switching relay circuit includes: the input end of the I-section main contactor fault signal manual reset loop and the II-section main contactor fault signal manual reset loop are connected with the positive electrode (+ KM) of a direct current power line through a third fuse 3FU and a third air switch QM3 positive electrode which are sequentially connected in series, and the output end of the I-section main contactor fault signal manual reset loop and the II-section main contactor fault signal manual reset loop are connected with the negative electrode (-KM) of the direct current power line through a fourth fuse 4FU and a third air switch QM3 negative electrode which are sequentially connected in series;
the manual reset loop of I section main contactor fault signal includes: a first parallel loop comprising: the normally open contact of the I-section power supply main contactor KMM1, the normally closed contact of the bus voltage monitoring relay KX3 and the coil of the sixth delay relay KT6 are sequentially connected; a second parallel loop comprising: the sixth delay relay KT6 normally open contact and the ninth intermediate relay K9 coil are sequentially connected; the ninth intermediate relay K9 normally open contact and the first normally closed button SB1 are connected in sequence; the input end of the normally open contact of the ninth intermediate relay K9 is connected with the input end of the normally open contact of the sixth delay relay KT 6; the output end of the first normally closed button SB1 is connected with the output end of a normally open contact of a sixth delay relay KT 6; the first parallel loop and the second parallel loop are arranged in parallel; the manual return circuit that resets of II section main contactor fault signal includes: a third parallel loop comprising: the normally open contact of the II-section power supply main contactor KMM2, the normally closed contact of the busbar voltage monitoring relay KX3 and the coil of the seventh delay relay KT7 are sequentially connected; a fourth parallel loop comprising: the normally open contact of the seventh delay relay KT7 and the coil of the tenth intermediate relay K10 are sequentially connected; the tenth intermediate relay K10 normally open contact and the second normally closed button SB2 are connected in sequence; the normally open contact input end of the tenth intermediate relay K10 is connected with the normally open contact input end of the seventh delay relay KT 7; the output end of the second normally closed button SB2 is connected with the output end of a normally open contact of a seventh delay relay KT 7;
the third parallel loop and the fourth parallel loop are arranged in parallel; the transfer switch CK1 is a manual transfer switch, and when the left I gear is turned to, the contacts (5) - (6) and the contacts (9) -are closed; when the gear is shifted to the right II, the contacts (3) - (4) and the contacts (7) - (8) are closed; the first normally closed button SB1 and the second normally closed button SB2 are manual self-resetting buttons.
2. The forced oil circulation air-cooled transformer cooling control system of claim 1 including: the first branch circuit further comprises: the coil of the first delay relay KT1 is arranged between a normally open contact of the second intermediate relay K2 and a normally closed contact of the II-section power supply main contactor KMM 2; the output end of the first delay relay KT1 coil is connected with the output end of the second branch;
the I section power supply automatic control loop also comprises: the input end of the seventh intermediate relay K7 normally open contact is connected with the input end of the second intermediate relay K2 normally open contact, and the output end of the seventh intermediate relay K7 normally open contact is connected with the input end of the first intermediate relay K1 normally open contact; the power switching relay circuit further includes: the I section main contactor trouble rescue return circuit, with parallelly connected setting of first parallel return circuit includes: the coil of the normally open contact of the delay relay KT2 and the coil of the intermediate relay K8 are sequentially connected; the third branch circuit further comprises: the coil of the second delay relay KT2 is arranged between the normally open contact of the first intermediate relay K1 and the normally closed contact of the I-section power supply main contactor KMM 1; the output end of the second delay relay KT2 coil is connected with the output end of the fourth branch; the automatic control loop of the II-stage power supply further comprises: the input end of the eighth intermediate relay K8 normally open contact is connected with the input end of the first intermediate relay K1 normally open contact, and the output end of the eighth intermediate relay K8 normally open contact is connected with the input end of the second intermediate relay K2 normally open contact; the power switching relay circuit further includes: the II section main contactor trouble rescue return circuit, with the parallelly connected setting of third parallel circuit includes: the normally open contact of the delay relay KT1 and the coil of the intermediate relay K7 are sequentially connected.
3. The forced oil circulation air-cooled transformer cooling control system of claim 2 including: the fault signal indicates return circuit, with parallelly connected setting of first parallel return circuit, includes:
the I section power failure indication loop includes: the normally closed contact of the first intermediate relay K1 and the third indicator lamp RD3 are connected in sequence;
a section II power failure indication circuit comprising: the second intermediate relay K2 normally closed contact and the fourth indicator lamp RD4 are connected in sequence;
the I section main contactor fault indication loop comprises: the eighth intermediate relay K8 normally open contact and the fifth indicator lamp RD5 are connected in sequence; a normally open contact of the ninth intermediate relay K9 is connected with a normally open contact of the eighth intermediate relay K8 in parallel;
a section II main contactor fault indication loop comprising: the seventh intermediate relay K7 normally open contact and the sixth indicator lamp RD6 are connected in sequence; the tenth intermediate relay K10 normally open contact is arranged in parallel with the seventh intermediate relay K7 normally open contact.
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| CN201810000288.0A CN108063491B (en) | 2018-01-01 | 2018-01-01 | Cooling control system of forced oil circulation air-cooled transformer |
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| CN201810000288.0A CN108063491B (en) | 2018-01-01 | 2018-01-01 | Cooling control system of forced oil circulation air-cooled transformer |
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| CN110161955B (en) * | 2019-05-31 | 2024-02-02 | 广东电网有限责任公司 | Transformer cooling box PLC fault emergency processing method and normally open relay |
| CN110259675B (en) * | 2019-06-21 | 2024-06-11 | 泰豪科技股份有限公司 | Variable-frequency one-to-two control circuit and system for circulating water pump with cooling fan |
| CN111711193A (en) * | 2020-07-17 | 2020-09-25 | 中车大连机车车辆有限公司 | Power supply control method and device for multi-connection electric locomotive |
| CN112271730B (en) * | 2020-10-28 | 2022-06-24 | 浙江佳乐科仪股份有限公司 | Electrical control box for switching main power supply and auxiliary power supply |
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