CN112952993B - Dual-power supply spare power automatic switching loop control method based on relay lap joint - Google Patents
Dual-power supply spare power automatic switching loop control method based on relay lap joint Download PDFInfo
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- CN112952993B CN112952993B CN202110398768.9A CN202110398768A CN112952993B CN 112952993 B CN112952993 B CN 112952993B CN 202110398768 A CN202110398768 A CN 202110398768A CN 112952993 B CN112952993 B CN 112952993B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004891 communication Methods 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 230000006698 induction Effects 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The invention discloses a control method of a dual-power-supply automatic switching loop based on relay lap joint, which belongs to the technical field of dual-power-supply automatic switching control.
Description
Technical Field
The invention relates to the technical field of automatic control of dual-power supply automatic switching, in particular to a dual-power supply automatic switching loop control method based on relay lap joint for raw material silver powder.
Background
And a communication breaker is arranged between two sections of low-voltage PC sections which are mutually in dark standby in a power plant, and the following requirements are met in the procedure of accident switching: the mode of 'manual switching after confirming that the power center bus system has no permanent fault' should be adopted. However, in actual engineering, operators want to adopt automatic switching to simplify the power recovery work after failure, so most engineering can configure a standby power supply automatic switching device to realize the automatic switching function.
However, in some projects, because the project investment amount is very low, the total package party is not willing to increase the investment of the spare automatic switching device in order to save the cost, and only the spare automatic switching device can be switched in a manual operation mode, therefore, if the function of automatic switching is realized on the spare automatic switching circuit, the function of automatic switching can only be realized by adding a control device in the circuit breaker interconnection switch control circuit of the existing central bus, and as shown in fig. 2, the common circuit breaker interconnection switch control circuit comprises tripping strip lamp buttons PB1 and PB2, a switching relay KC, a tripping relay KOF, a remote on-site transfer switch SS1, an automatic switching selection switch SS2, two time relays KS2 and KS3 and a fault re-acting relay K1, and an auxiliary contact S2 of the circuit breaker in the circuit breaker interconnection switch control circuit is generally tripped by connecting the circuit CB1 on both sides of a tripping coil MX through a connecting piece XB.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides a control method for realizing a dual-power-supply spare power automatic switching loop based on relay lap joint with low cost and high efficiency.
The invention provides a control method of a dual-power-supply spare power automatic switching circuit based on relay lap joint, which comprises two mutually standby power supply buses I and power supply buses II, wherein the power supply buses I and the power supply buses II are connected into a circuit breaker CB1 and a circuit breaker CB2 with a contact switch control circuit through a circuit breaker QF1 and a circuit breaker QF2, and a unit transformer A and a unit transformer B respectively to form a PC power supply section A and a PC power supply section B; the circuit breakers CB1 and CB2 are connected with time relays KS2 and KS3 with inconsistent delay time lengths and the circuit breakers CB3 used for standby automatic switching control, the communication switch control circuits of the circuit breakers CB1 and CB2 are respectively connected with the communication switch control circuit drive control of the circuit breakers CB3 through a relay K2A and a relay K2B, normally open auxiliary contacts of the relay K2A and the relay K2B are respectively connected with the communication switch control circuits of the circuit breakers CB1 and CB2 in series, and then are connected into positive power supply circuits of time relays KS2 and KS3 in the communication switch control circuits of the circuit breakers CB3, namely, only when the relay K2A and the relay K2B are powered on, the time relays KS2 and KS3 can be powered on, and the power supply of the relay K2A and the relay K2B is directly related to the power supply condition of a bus corresponding to the circuit breakers CB1 and CB 2;
under the normal state, the circuit breakers CB1 and CB2 are switched on, the contact circuit breaker CB3 is in a disconnected state, and the power supply bus I and the power supply bus II supply power for the PC power supply section A or the PC power supply section B respectively through the circuit breakers CB1 and CB 2;
if the circuit breaker CB1 or CB2 is subjected to displacement tripping, the circuit breaker QF1 or QF2 of the power supply bus I or the power supply bus II is connected with a normally closed auxiliary contact S2 in a contact switch control circuit of the circuit breaker CB1 or CB 2; the circuit breaker CB1 or CB2 is closed by a normally closed auxiliary contact F in a contact switch control circuit, the normally closed auxiliary contact F is arranged on a circuit breaker equipment body, the circuit breaker CB1 or CB2 is used for supplying goods in a complete set, when the circuit breaker is switched on or tripped and shifts, the auxiliary contact on the body also shifts at the same time, and normally closed means that the circuit breaker is normally in a tripping position, and the auxiliary contact is in a closing state. At this time, the power supply of the PC power supply section A or the PC power supply section B is stopped, at this time, the normally closed auxiliary contact F of the CB2 or the CB1 is not shifted, namely, the F is still in an open state, and the power supply of the PC power supply section B or the PC power supply section A is still normal; after the normally closed auxiliary contact F is closed, the relay K2A and the relay K2B are electrified, a closing loop of the breaker CB3 interconnection switch control circuit and a closing loop of the time relay KS2 and the KS3 which are respectively used for controlling the closing loop of the breaker CB3 interconnection switch control circuit to be closed are respectively closed, namely, when the breaker CB1 is successfully closed, the normally closed auxiliary contact F is switched into an open state, so that the relay K2A and the relay K2B are electrified, namely, the normally closed auxiliary contacts F of the breaker CB1 and the breaker CB2 are electrified, as long as one contact is in a closed state, the time relay KS2 and the breaker KS3 in the standby automatic switching loop are electrified, the closing loop of the time relay KS2 is controlled to be closed to be connected with the closing loop of the breaker CB3, after the breaker CB3 is closed in place, the time relay KS3 is controlled to be opened, and the closing loop of the breaker CB3 interconnection switch control circuit is opened, and the automatic closing operation of the breaker CB3 is completed.
In the interconnection switch control circuit of the circuit breaker CB3, from a positive power supply, the positive power supply sequentially passes through a K1 normally-closed contact in the interconnection switch control circuit of the circuit breaker CB1 and the circuit breaker CB2, then passes through a normally-closed auxiliary contact F in the interconnection switch control circuit of the circuit breaker CB1 or the circuit breaker CB2, and then passes through a double-power-supply spare power automatic switching transfer switch SS2 arrival time relay KS2 and KS3 in the interconnection switch control circuit of the circuit breaker CB3, and finally returns to a negative power supply of the interconnection switch control circuit of the circuit breaker CB 3.
The switch SS2 is a knob with double positions, and comprises an input position for shorting circuits on two sides of the switch SS2 and an exit position for disconnecting circuits on two sides of the switch SS2, the control of the switch SS2 can be completed through manual operation, and in the scheme, the control of the switch SS2 is irrelevant to the states of the K2A and the relay K2B.
After the normally closed auxiliary contact F is closed, a power supply loop of the circuit breaker CB3, which is connected with the switch control circuit, is connected, the delay time of the time relay KS2 is shorter than that of the time relay KS3, after the time relays KS2 and KS3 are powered on simultaneously, the delay time of the time relay KS2 is shorter, the delay closing contact is closed, the closing loop of the circuit breaker CB3, which is connected with the switch control circuit, is automatically connected, and the circuit breaker CB3 is closed after the closing coil XF is powered on. The time delay time of the time relay KS3 is longer, after the timing arrives, the circuit breaker CB3 is switched on, the KS3 delay disconnection contact is disconnected, the switching-on loop is automatically disconnected, and the circuit breaker CB3 is automatically switched on.
After the normally closed auxiliary contacts F are closed, the relay K2A and the relay K2B are electrified, specifically, after the normally open auxiliary contacts of the relay K2A and the relay K2B are respectively connected in series with the positive power supply of the DCS control system of the interconnection switch control circuit of the circuit breakers CB1 and CB2, when the circuit breakers CB1 or CB2 are subjected to deflection tripping, the switching-on contact of the positive power supply of the DCS control system in the interconnection switch control circuit of the circuit breakers CB1 or CB2 is closed, the switching-on relay KC coil connected after the switching-on contact is electrified, and after the relay coil is electrified, the normally open auxiliary contacts are closed, so that the relay K2A or the relay K2B is electrified. That is, when the coil of the relay KC is powered on, the auxiliary contact on the body of the relay KC is shifted, the normally open auxiliary contact is switched to a closed state, the circuit is conducted, and the coil of the relay K2 can be powered on.
And the switching-on relay KC coil connected after the switching-on contact is electrified, and specifically, when the voltage difference between two sides of the switching-on relay KC is greater than 75% of the power supply voltage, the switching-on relay KC coil is judged to be electrified.
Compared with the prior art, the technical scheme of the invention has the advantages that the connecting control circuit of the bus breaker is electrically connected with the connecting control circuit of the circuit breaker for switching by the relay through adding the circuit breaker for switching between the dual-power supply automatic switching circuits, the cost of the automatic switching circuit control equipment is saved, the automatic induction and control switching is realized by using the connecting control circuit of the existing automatic circuit breaker as the switching connection point, the automatic switching function of the dual-power supply automatic switching circuit is realized very efficiently, and the dual-power supply system which is not provided with the dual-power supply automatic switching equipment is well applied.
Drawings
The foregoing and the following detailed description of the invention will become more apparent when read in conjunction with the following drawings in which:
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a connection structure of a tie switch control circuit of the circuit breaker CB1 or CB2 of the present invention.
Detailed Description
The technical solution for achieving the object of the present invention will be further described with reference to several specific examples, but it should be noted that the technical solution claimed in the present invention includes but is not limited to the following examples.
Example 1
As a basic technical scheme, the embodiment of the invention discloses a control method of a dual-power-supply standby automatic switching circuit based on relay lap joint, as shown in figure 1, wherein the dual-power-supply standby automatic switching circuit comprises two mutually standby power supply buses I and power supply buses II, and the power supply buses I and the power supply buses II are connected into the circuit breakers CB1 and CB2 with a contact switch control circuit through the circuit breakers QF1 and QF2 and the unit transformers A and B respectively to form a PC power supply A section and a PC power supply B section; and as shown in fig. 1 and 2, a time relay KS2 and KS3 with inconsistent delay time length is connected between the circuit breakers CB1 and CB2, and the circuit breakers CB3 for backup automatic switching control are arranged in the circuit breakers CB1 and CB2, the circuit breakers CB1 and CB2 are respectively connected with the circuit breakers CB3 through a relay K2A and a relay K2B in a driving control manner, normally open auxiliary contacts of the relay K2A and the relay K2B are respectively connected in series with the circuit breakers CB1 and CB2, and then are connected into a positive power supply loop of the time relays KS2 and KS3 in the circuit breakers CB3, namely, the time relays KS2 and KS3 can be powered only when the relay K2A and the relay K2B are powered, and whether the relay K2A and the relay K2B are powered is directly related to a power supply bus corresponding to the circuit breakers CB1 and CB 2.
Under the normal state, the circuit breakers CB1 and CB2 are switched on, the contact circuit breaker CB3 is in a disconnected state, and the power supply bus I and the power supply bus II supply power for the PC power supply section A or the PC power supply section B respectively through the circuit breakers CB1 and CB 2;
if the circuit breaker CB1 or CB2 is subjected to displacement tripping, the circuit breaker QF1 or QF2 of the power supply bus I or the power supply bus II is connected with a normally closed auxiliary contact S2 in a contact switch control circuit of the circuit breaker CB1 or CB 2; the circuit breaker CB1 or CB2 is closed by a normally closed auxiliary contact F in a contact switch control circuit, the normally closed auxiliary contact F is arranged on a circuit breaker equipment body, the circuit breaker CB1 or CB2 is used for supplying goods in a complete set, when the circuit breaker is switched on or tripped and shifts, the auxiliary contact on the body also shifts at the same time, and normally closed means that the circuit breaker is normally in a tripping position, and the auxiliary contact is in a closing state. At this time, the power supply of the PC power supply section A or the PC power supply section B is stopped, at this time, the normally closed auxiliary contact F of the CB2 or the CB1 is not shifted, namely, the F is still in an open state, and the power supply of the PC power supply section B or the PC power supply section A is still normal; after the normally closed auxiliary contact F is closed, the relay K2A and the relay K2B are electrified, a closing loop of the breaker CB3 interconnection switch control circuit and a closing loop of the time relay KS2 and the KS3 which are respectively used for controlling the closing loop of the breaker CB3 interconnection switch control circuit to be closed are respectively closed, namely, when the breaker CB1 is successfully closed, the normally closed auxiliary contact F is switched into an open state, so that the relay K2A and the relay K2B are electrified, namely, the normally closed auxiliary contacts F of the breaker CB1 and the breaker CB2 are electrified, as long as one contact is in a closed state, the time relay KS2 and the breaker KS3 in the standby automatic switching loop are electrified, the closing loop of the time relay KS2 is controlled to be closed to be connected with the closing loop of the breaker CB3, after the breaker CB3 is closed in place, the time relay KS3 is controlled to be opened, and the closing loop of the breaker CB3 interconnection switch control circuit is opened, and the automatic closing operation of the breaker CB3 is completed.
According to the technical scheme, the circuit breaker for switching is additionally arranged between the dual-power automatic switching circuit, the relay is used for electrically controlling the contact control circuit of the bus circuit breaker and the contact control circuit of the circuit breaker for switching, the cost of the automatic switching circuit control equipment is saved, the existing automatic circuit breaker is used as a switching connection point, automatic induction and control switching are realized by using the contact control circuit, the automatic switching function of the dual-power automatic switching circuit is realized very efficiently, and the existing dual-power supply system which is not provided with the automatic switching equipment is well applied.
Example 2
As a more specific and preferable technical scheme of the invention, a double-power-supply standby automatic switching circuit control method based on relay lap joint is shown in figure 1, wherein the double-power-supply standby automatic switching circuit comprises two mutually standby power supply buses I and power supply buses II, and the power supply buses I and the power supply buses II are connected into the circuit breakers CB1 and CB2 with a contact switch control circuit through the circuit breakers QF1 and QF2 and the unit transformers A and B respectively to form a PC power supply A section and a PC power supply B section; and as shown in fig. 1 and 2, a time relay KS2 and KS3 with inconsistent delay time length is connected between the circuit breakers CB1 and CB2, and the circuit breakers CB3 for backup automatic switching control are arranged in the circuit breakers CB1 and CB2, the circuit breakers CB1 and CB2 are respectively connected with the circuit breakers CB3 through a relay K2A and a relay K2B in a driving control manner, normally open auxiliary contacts of the relay K2A and the relay K2B are respectively connected in series with the circuit breakers CB1 and CB2, and then are connected into a positive power supply loop of the time relays KS2 and KS3 in the circuit breakers CB3, namely, the time relays KS2 and KS3 can be powered only when the relay K2A and the relay K2B are powered, and whether the relay K2A and the relay K2B are powered is directly related to a power supply bus corresponding to the circuit breakers CB1 and CB 2.
In the interconnection switch control circuit of the circuit breaker CB3, from a positive power supply, the positive power supply sequentially passes through a K1 normally-closed contact in the interconnection switch control circuit of the circuit breaker CB1 and the circuit breaker CB2, then passes through a normally-closed auxiliary contact F in the interconnection switch control circuit of the circuit breaker CB1 or the circuit breaker CB2, and then passes through a double-power-supply standby automatic switching switch SS2 in the interconnection switch control circuit of the circuit breaker CB3 to reach time relays KS2 and KS3, and finally returns to a negative power supply of the interconnection switch control circuit of the circuit breaker CB 3.
The switch SS2 is a knob with double positions, and comprises an input position for shorting circuits on two sides of the switch SS2 and an exit position for disconnecting circuits on two sides of the switch SS2, the control of the switch SS2 can be completed through manual operation, and in the scheme, the control of the switch SS2 is irrelevant to the states of the K2A and the relay K2B.
Under the normal state, the circuit breakers CB1 and CB2 are switched on, the contact circuit breaker CB3 is in a disconnected state, and the power supply bus I and the power supply bus II supply power for the PC power supply section A or the PC power supply section B respectively through the circuit breakers CB1 and CB 2;
if the circuit breaker CB1 or CB2 is subjected to displacement tripping, the circuit breaker QF1 or QF2 of the power supply bus I or the power supply bus II is connected with a normally closed auxiliary contact S2 in a contact switch control circuit of the circuit breaker CB1 or CB 2; the circuit breaker CB1 or CB2 is closed by a normally closed auxiliary contact F in a contact switch control circuit, the normally closed auxiliary contact F is arranged on a circuit breaker equipment body, the circuit breaker CB1 or CB2 is used for supplying goods in a complete set, when the circuit breaker is switched on or tripped and shifts, the auxiliary contact on the body also shifts at the same time, and normally closed means that the circuit breaker is normally in a tripping position, and the auxiliary contact is in a closing state. At this time, the power supply of the PC power supply section A or the PC power supply section B is stopped, at this time, the normally closed auxiliary contact F of the CB2 or the CB1 is not shifted, namely, the F is still in an open state, and the power supply of the PC power supply section B or the PC power supply section A is still normal; after the normally closed auxiliary contact F is closed, the relay K2A and the relay K2B are electrified, a closing loop of the breaker CB3 interconnection switch control circuit and a closing loop of the time relay KS2 and the KS3 which are respectively used for controlling the closing loop of the breaker CB3 interconnection switch control circuit to be closed are respectively closed, namely, when the breaker CB1 is successfully closed, the normally closed auxiliary contact F is switched into an open state, so that the relay K2A and the relay K2B are electrified, namely, the normally closed auxiliary contacts F of the breaker CB1 and the breaker CB2 are electrified, as long as one contact is in a closed state, the time relay KS2 and the breaker KS3 in the standby automatic switching loop are electrified, the closing loop of the time relay KS2 is controlled to be closed to be connected with the closing loop of the breaker CB3, after the breaker CB3 is closed in place, the time relay KS3 is controlled to be opened, and the closing loop of the breaker CB3 interconnection switch control circuit is opened, and the automatic closing operation of the breaker CB3 is completed. More specifically, after the normally closed auxiliary contact F is closed, the power supply loops of the time relay KS2 and KS3 in the circuit breaker CB3 connecting switch control circuit are switched on, the delay time of the time relay KS2 is shorter than that of the time relay KS3, after the time relays KS2 and KS3 are powered on simultaneously, the delay time of the time relay KS2 is shorter, the delay closing contact is closed, the closing loop of the circuit breaker CB3 connecting switch control circuit is automatically switched on, and the circuit breaker CB3 is closed after the closing coil XF is powered on. The time delay time of the time relay KS3 is longer, after the timing arrives, the circuit breaker CB3 is switched on, the KS3 delay disconnection contact is disconnected, the switching-on loop is automatically disconnected, and the circuit breaker CB3 is automatically switched on.
After the normally closed auxiliary contacts F are closed, the relay K2A and the relay K2B are electrified, specifically, after the normally open auxiliary contacts of the relay K2A and the relay K2B are respectively connected in series with the positive power supply of the DCS control system of the interconnection switch control circuit of the circuit breakers CB1 and CB2, when the circuit breakers CB1 or CB2 are subjected to deflection tripping, the switching-on contact of the positive power supply of the DCS control system in the interconnection switch control circuit of the circuit breakers CB1 or CB2 is closed, the switching-on relay KC coil connected after the switching-on contact is electrified, and after the relay coil is electrified, the normally open auxiliary contacts are closed, so that the relay K2A or the relay K2B is electrified. That is, when the coil of the relay KC is powered on, the auxiliary contact on the body of the relay KC is shifted, the normally open auxiliary contact is switched to a closed state, the circuit is conducted, and the coil of the relay K2 can be powered on. And the switching-on relay KC coil connected after the switching-on contact is electrified, and specifically, when the voltage difference between two sides of the switching-on relay KC is greater than 75% of the power supply voltage, the switching-on relay KC coil is judged to be electrified.
Namely, under normal conditions, a connecting breaker CB3 between a PC power supply A section and a PC power supply B section is disconnected, and a power supply of the PC power supply A section is obtained by changing a high-voltage side breaker QF2 through a unit and then sequentially changing the A and a low-voltage side breaker CB2 of a transformer, namely both QF2 and CB2 are switched on; the power supply of the PC power supply B section is obtained through a unit change B high-voltage side breaker QF1 and then sequentially through the unit change B and a transformer low-voltage side breaker CB1, namely both QF1 and CB1 are switched on;
when the circuit breaker QF1 is subjected to displacement tripping, the normally closed auxiliary contact S2 of the QF1 is closed, the circuit breaker CB1 is tripped, the normally closed auxiliary contact F of the CB1 is closed, the power supply of the PC B section disappears, at the moment, the normally closed auxiliary contact F of the CB2 is not displaced, namely the F is still in an open state, and the power supply of the PC A section is normal.
After the normally closed auxiliary contact F of the CB1 breaker is closed, a power supply loop of the KS2 and KS3 time relay in the CB3 switch cabinet is turned on, the loop power supply sequentially passes through a K1 normally closed contact in the switch cabinet where the CB1 breaker is located and a K1 normally closed contact in the switch cabinet where the CB2 breaker is located, then passes through a normally closed auxiliary contact F of the CB1 breaker in the switch cabinet where the CB1 breaker is located or a normally closed auxiliary contact F of the CB2 breaker in the switch cabinet where the CB2 breaker is located, then sequentially passes through a K2 normally open contact in the switch cabinet where the CB1 breaker is located and a K2 normally open contact in the switch cabinet where the CB2 breaker is located, then passes through a double-power backup automatic switching switch SS2 in the switch cabinet where the CB3 is located, and then returns to a negative power supply in the switch cabinet.
After the KS2 and KS3 time relays are powered on simultaneously, the delay time of the KS2 is short, the delayed closing contact is closed, the closing loop is automatically closed, and the circuit breaker CB3 is closed after the closing coil XF is powered on. The delay time of KS3 is longer, and after the circuit breaker CB3 is switched on, the KS3 delay disconnection contact is disconnected, and the switching-on loop is automatically disconnected. The automatic closing operation of the circuit breaker CB3 is completed.
Claims (6)
1. A dual-power supply automatic switching loop control method based on relay overlap joint is characterized in that: the dual-power supply standby automatic switching circuit comprises two mutually standby power supply buses I and II, wherein the power supply buses I and II are connected into circuit breakers CB1 and CB2 with interconnection switch control circuits through a circuit breaker QF1 and a circuit breaker QF2 and a unit transformer A and a unit transformer B respectively to form a PC power supply A section and a PC power supply B section; the circuit breakers CB1 and CB2 are connected with time relays KS2 and KS3 with inconsistent delay time lengths and the circuit breakers CB3 used for spare power automatic switching control, the communication switch control circuits of the circuit breakers CB1 and CB2 are respectively connected with the communication switch control circuit of the circuit breakers CB3 through a relay K2A and a relay K2B in a driving control way, and normally open auxiliary contacts of the relay K2A and the relay K2B are respectively connected into positive power supply loops of the time relays KS2 and KS3 in the communication switch control circuit of the circuit breakers CB1 and CB2 in series after the communication switch control circuit of the circuit breakers CB3 is respectively connected with the communication switch control circuit of the circuit breakers CB 2;
under the normal state, the circuit breakers CB1 and CB2 are switched on, the circuit breaker CB3 is in an off state, and the power supply bus I and the power supply bus II are respectively used for normally supplying power to the PC power supply section A or the PC power supply section B through the circuit breakers CB1 and CB 2;
if the circuit breaker CB1 or CB2 is subjected to displacement tripping, the circuit breaker QF1 or QF2 of the power supply bus I or the power supply bus II is connected with a normally closed auxiliary contact S2 in a contact switch control circuit of the circuit breaker CB1 or CB 2; the normally closed auxiliary contact F of the circuit breaker CB1 or CB2 in the interconnection switch control circuit is closed, so that the relay K2A and the relay K2B are powered on, the power supply circuits of the time relays KS2 and KS3 which are respectively used for controlling the switching-on and switching-off of the switching-on circuit of the interconnection switch control circuit of the circuit breaker CB3 in the interconnection switch control circuit are switched on, the switching-on circuit of the interconnection switch control circuit of the circuit breaker CB3 is controlled by the time relay KS2 to switch on the circuit breaker CB3, and after the switching-on of the circuit breaker CB3 is in place, the switching-on circuit of the interconnection switch control circuit of the circuit breaker CB3 is controlled by the time relay KS3 to switch off, and the automatic switching-on operation of the circuit breaker CB3 is completed.
2. The control method of the dual-power supply automatic switching circuit based on relay lap joint of claim 1, which is characterized by comprising the following steps: in the interconnection switch control circuit of the circuit breaker CB3, from a positive power supply, the positive power supply sequentially passes through a K1 normally-closed contact in the interconnection switch control circuit of the circuit breaker CB1 and the circuit breaker CB2, then passes through a normally-closed auxiliary contact F in the interconnection switch control circuit of the circuit breaker CB1 or the circuit breaker CB2, and then passes through a double-power-supply spare power automatic switching transfer switch SS2 arrival time relay KS2 and KS3 in the interconnection switch control circuit of the circuit breaker CB3, and finally returns to a negative power supply of the interconnection switch control circuit of the circuit breaker CB 3.
3. The control method of the dual-power supply automatic switching circuit based on relay lap joint of claim 2, which is characterized by comprising the following steps: the switch SS2 is a knob with double positions, and comprises an input position for shorting circuits on two sides of the switch SS2 and an exit position for disconnecting the circuits on two sides of the switch SS 2.
4. The dual-power supply automatic switching loop control method based on relay lap joint as claimed in claim 1, 2 or 3, wherein the method comprises the following steps: after the normally closed auxiliary contact F is closed, a power supply loop of the time relay KS2 and the KS3 in the circuit breaker CB3 interconnection switch control circuit is connected, the delay time of the time relay KS2 is shorter than that of the time relay KS3, after the time relay KS2 and the KS3 are powered on simultaneously, a delay closing contact of the time relay KS2 is closed, a closing loop of the circuit breaker CB3 interconnection switch control circuit is automatically connected, the circuit breaker CB3 is closed after the closing coil XF is powered on, a delay opening contact of the time relay KS3 is opened, the closing loop is automatically opened, and the automatic closing operation of the circuit breaker CB3 is completed.
5. The dual-power supply automatic switching loop control method based on relay lap joint as claimed in claim 1, 2 or 3, wherein the method comprises the following steps: after the normally closed auxiliary contacts F are closed, the relay K2A and the relay K2B are electrified, specifically, the normally open auxiliary contacts of the relay K2A and the relay K2B are respectively connected in series to the positive power supply of the DCS control system of the interconnection switch control circuit of the circuit breakers CB1 and CB2, when the circuit breakers CB1 or CB2 are subjected to deflection tripping, the switching-on contact of the positive power supply of the DCS control system in the interconnection switch control circuit of the circuit breakers CB1 or CB2 is closed, the switching-on relay KC coil connected behind the switching-on contact is electrified, and the normally open auxiliary contacts are closed, so that the relay K2A or the relay K2B is electrified.
6. The control method of the dual-power supply automatic switching circuit based on relay lap joint of claim 5, which is characterized in that: and the switching-on relay KC coil connected to the switching-on contact is powered on, and specifically, when the voltage difference between two sides of the switching-on relay KC is greater than 75% of the power supply voltage, the switching-on relay KC coil is judged to be powered on.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202997692U (en) * | 2013-01-09 | 2013-06-12 | 戴顿（重庆）高压开关有限公司 | Dual power source load switch automatic switching return circuit |
| CN106207985A (en) * | 2016-08-29 | 2016-12-07 | 国网江苏省电力公司镇江供电公司 | Incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method |
| CN208353057U (en) * | 2018-06-19 | 2019-01-08 | 河南森源电气股份有限公司 | A kind of mother spare power automatic switching control circuit and spare power automatic switching system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8004390B2 (en) * | 2006-10-06 | 2011-08-23 | Wolo Mfg. Corp. | Horn device having a plural power supply |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202997692U (en) * | 2013-01-09 | 2013-06-12 | 戴顿（重庆）高压开关有限公司 | Dual power source load switch automatic switching return circuit |
| CN106207985A (en) * | 2016-08-29 | 2016-12-07 | 国网江苏省电力公司镇江供电公司 | Incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection locking spare power automatic switching method |
| CN208353057U (en) * | 2018-06-19 | 2019-01-08 | 河南森源电气股份有限公司 | A kind of mother spare power automatic switching control circuit and spare power automatic switching system |
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