CN108963960B - Control switch in control loop of transformer substation breaker - Google Patents
Control switch in control loop of transformer substation breaker Download PDFInfo
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- CN108963960B CN108963960B CN201710377673.2A CN201710377673A CN108963960B CN 108963960 B CN108963960 B CN 108963960B CN 201710377673 A CN201710377673 A CN 201710377673A CN 108963960 B CN108963960 B CN 108963960B
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- 238000002955 isolation Methods 0.000 claims description 19
- 230000004044 response Effects 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/06—Arrangements for supplying operative power
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
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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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/16—Electric power substations
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Abstract
The invention provides a control switch in a control loop of a transformer substation breaker, which comprises an IGBT, a relay, a first controller for controlling the on-off of the IGBT and a second controller for controlling the on-off of the relay, wherein the first controller is used for controlling the on-off of the relay; the collector of the IGBT is connected with one end of a contact of the relay in parallel to form an anode wiring terminal of the control switch; the emitter of the IGBT is connected with the other end of the contact of the relay in parallel to form a negative electrode wiring terminal of the control switch; when the circuit breaker is used, on one hand, the switching-on and switching-off time of the circuit breaker is accurately controlled by utilizing the advantage that the on-off response time of the IGBT is tens of microseconds, on the other hand, the IGBT only bears the conducting current in a few millisecond time periods of initial current flowing and final current cutting of the circuit breaker control loop, and the conducting current passes through the relay contact in the most other time, so that the problem that serious heating and even burning caused by long-time large current flowing of the IGBT in the prior art can be effectively solved.
Description
Technical Field
The invention relates to a circuit breaker control loop, in particular to a control switch in a transformer substation circuit breaker control loop.
Background
The circuit breaker is very important equipment in the transformer substation, and when the system breaks down, the control equipment cooperates to accomplish the control to the circuit breaker, can cut off fault current rapidly through the circuit breaker to prevent the accident from expanding, guarantee the steady operation of whole electric power system, consequently the direct influence of circuit breaker control circuit whether can the quick excision trouble.
The circuit breaker control loop comprises a closing loop and a tripping loop, one common structure of the circuit breaker control loop is shown in fig. 1, the tripping loop consists of a circuit breaker tripping control switch R1 and a first current holding relay, and the first current holding relay comprises a coil A and a contact A1; the switching-on loop is composed of a breaker switching-on control switch R2 and a second current holding relay, wherein the second current holding relay comprises a coil B and a contact B2. The breaker tripping control switch R1 and the breaker closing control switch R2 are conventionally manual switches, at present, a relay switch based on automatic control is commonly adopted, the working principle of the relay switch takes a closing loop as an example, when the R2 is closed, current in an operation loop flows from an operation power supply +R2, a second current keeps the relay coil B, an auxiliary contact of the breaker and the closing coil DL2 to the operation power supply-, so that the breaker can smoothly close; meanwhile, when current passes through the coil B of the second relay, the contact B2 of the second relay is closed, and when R2 is opened, the auxiliary contact of the circuit breaker and the closing coil DL2 still pass through the current, so that the reliable closing process of the circuit breaker is ensured.
With new requirements on the aspects of grid surge voltage, harmonic waves and the like in the opening and closing process of the circuit breaker, the operation overvoltage and harmonic waves are expected to be controlled within a certain range when the circuit breaker acts, so that the damage of the overvoltage of primary equipment and the reduction of the quality of power supply power are avoided, and therefore clear requirements are placed on the moment of the circuit breaker. For example, when closing a switch, it is desirable for a capacitive load that the circuit breaker be able to close at the zero crossing of the voltage, so that the impact on the power grid is relatively small. The action time of the relay is often 4-10 ms, the action time discreteness is larger, the power system in China is a 50Hz system, and 20ms is a cycle, which means that the 5ms time discreteness voltage waveform can reach the peak value from the zero crossing point, so that the requirement of accurately controlling the opening and closing moment of the circuit breaker cannot be met by adopting the control method of the relay.
To solve this problem, IGBTs are also currently used as the breaker trip control switch R1 and the breaker closing control switch R2; the IGBT is fully called an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor), and has the biggest characteristics of being capable of realizing accurate control of an electric loop in the order of tens of microseconds and completely meeting the requirement of accurate control of the opening and closing moment of the circuit breaker. However, IGBTs also have some problems in use: for example, when the IGBT is turned on, there is a saturation voltage drop V CESAT Is present, resulting in conduction losses. Set V CESAT When the typical value is 3.2V and the drive current at the time of opening and closing the circuit breaker is 6A, the power loss generated in the IGBT is 3.2×6=19.2w when the circuit breaker control circuit is on, and the IGBT is liable to generate heat. Because the breaker can accomplish tripping operation or switching-on operation within 100ms under the normal condition, the IGBT can not appear the condition that burns out seriously generating heat under the normal condition, but when the breaker is unusual or need carry out the switching-on operation of switching on for several thousands of times in the test process, the IGBT can produce seriously generating heat because of switching on for a long time this moment, if the junction temperature of IGBT exceeds its junction temperature upper limit value, can cause IGBT permanent damage, leads to the circuit breaker uncontrollable, causes the expansion of electric power system fault range.
Therefore, the design of the control switch in the control loop of the transformer substation circuit breaker, which can meet the accurate control requirement of the switching-on and switching-off time of the circuit breaker and can prevent the problem that the currently adopted IGBT switch is easy to overheat, becomes a technical problem to be solved in the prior art.
Disclosure of Invention
The purpose of the invention is that: aiming at the problems in the prior art, the control switch in the control loop of the transformer substation breaker is provided, and the control switch can not only effectively meet the accurate control requirement of the breaker on-off moment, but also effectively prevent the IGBT from generating overheat phenomenon.
The technical scheme of the invention is as follows: the invention relates to a control switch in a control loop of a transformer substation breaker, which is structurally characterized in that: the intelligent control device comprises an IGBT, a relay, a first controller for controlling the on-off of the IGBT and a second controller for controlling the on-off of the relay;
the IGBT is provided with a grid electrode, a collector electrode and an emitter electrode; the relay is provided with a coil and a contact, and the first controller and the second controller are respectively provided with a power supply end, a control signal input end and a first control signal output end and a second control signal output end;
the grid electrode of the IGBT is electrically connected with the control signal end of the first controller; the positive electrode and the negative electrode of the coil of the relay are correspondingly and electrically connected with the first control signal end and the second control signal end of the second control loop; the collector of the IGBT is connected with one end of a contact of the relay in parallel to form a common contact, and the common contact forms an anode terminal of a control switch in a circuit breaker control loop of the transformer substation; the emitter of the IGBT, the other end of the contact of the relay and the second control signal output end of the first controller form a common contact because of being collinear, and the common contact forms a negative electrode terminal of a control switch in a circuit breaker control loop of the transformer substation;
when the transformer substation circuit breaker control circuit is used, the positive electrode terminal of the control switch in the transformer substation circuit breaker control circuit is electrically connected with the positive electrode of the operation power supply of the transformer substation circuit breaker control circuit, and the negative electrode terminal of the control switch in the transformer substation circuit breaker control circuit is electrically connected with the current holding relay coil in the circuit breaker control circuit; the power ends of the first controller and the second controller are connected with a direct current power supply VCC output by a matched automatic control system of the transformer substation breaker; the control signal input ends of the first controller and the second controller are correspondingly and electrically connected with the first PWM control signal output end and the second PWM control signal output end of the matched automatic control system of the transformer substation breaker.
The further scheme is as follows: the first controller includes a resistor R1, a triode Q1, an isolation transformer T, a resistor R2, a diode D1, and a diode D2;
the isolation transformer T is provided with a primary side positive and negative electrode terminal and a secondary side positive and negative electrode terminal; one end of the resistor R1 is the control signal input end of the first controller; the other end of the resistor R1 is electrically connected with the base electrode of the triode Q1; the emitter of the triode Q1 is grounded; the collector electrode of the triode Q1 is electrically connected with the primary side negative electrode wiring terminal of the isolation transformer T; the positive terminal of the secondary side of the isolation transformer T is electrically connected with one end of a resistor R2; the other end of the resistor R2 and the cathode of the diode D1 form a common contact point due to collineation, and the common contact point is the first control signal output end of the first controller; the positive electrode of the diode D1 is connected in series with the positive electrode of the diode D2; the cathode of the diode D2 and the cathode terminal of the secondary side of the isolation transformer T form a common contact because of being collinear, and the common contact is the second control signal output end of the first controller; the positive terminal of the primary side of the isolation transformer T is the power supply terminal of the first controller.
The further scheme is as follows: the second controller includes a MOS transistor Q2, a diode D3, and a diode D4;
the grid electrode of the MOS tube Q2 is the control signal input end of the second controller; the drain electrode of the MOS transistor Q2 is electrically connected with the cathode of the diode D4; the positive electrode of the diode D4 and the positive electrode of the diode D3 form a common joint because of being collinear, and the common joint is the second control signal output end of the second controller; the negative pole of the diode D3 is the first control signal output terminal of the second controller, and is also the power supply terminal of the second controller.
The invention has the positive effects that: according to the control switch in the transformer substation circuit breaker control loop, the relay contact point with low impedance is connected with the IGBT in parallel, and the relay and the IGBT are controlled in a time sequence matching mode by using one controller respectively, so that when the control switch is used, on one hand, the advantage that the on-off response time of the IGBT is tens of microseconds is fully utilized, the accurate control of the on-off moment of the circuit breaker is realized, and the technical requirement of accurately controlling the on-off moment of the circuit breaker is effectively met; on the other hand, the IGBT only bears all the conduction current of the circuit breaker control loop in a period of a few milliseconds of the initial current flowing of the circuit breaker control loop and a period of a few milliseconds before the final current cutting-off, and the conduction current mainly passes through the contact K of the relay in most of the current conduction time (about 90 ms) of the circuit breaker control loop, so that the technical problem that serious heating and even burning caused by long-time large current flowing of the IGBT in the prior art can be effectively solved.
Drawings
FIG. 1 is a schematic diagram of a control loop of a substation circuit breaker, schematically illustrating its electrical connection to the circuit breaker;
FIG. 2 is a schematic diagram of the structure of the present invention; in use, it is used to replace the control switches R1 and R2 in fig. 1.
FIG. 3 is an electrical schematic diagram of the first controller of FIG. 2, further illustrating its electrical connection to the IGBT;
FIG. 4 is an electrical schematic diagram of the second controller of FIG. 2, further illustrating its electrical connection to the positive and negative poles of the relay coil;
fig. 5 is a schematic diagram of timing coordination of the IGBT and relay through-flows under the control of the first and second controllers when the present invention shown in fig. 2 is in use.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
Example 1
Referring to fig. 2, the control switch in the control loop of the substation breaker of the embodiment mainly comprises an IGBT, a relay, a first controller and a second controller.
The IGBT is provided with a grid G, a collector C and an emitter E, the relay is provided with a coil and a contact K, and the first controller and the second controller are respectively provided with a power supply end, a control signal input end, a first control signal output end and a second control signal output end.
The grid G of the IGBT is electrically connected with a first control signal output end of the first controller; the positive electrode and the negative electrode of the coil of the relay are correspondingly and electrically connected with the first control signal output end and the second control signal output end of the second control loop; the collector C of the IGBT is connected with one end of a contact K of the relay in parallel to form a common contact, and the common contact forms an anode terminal J+ of the control switch in the embodiment; the emitter E of the IGBT, the other end of the contact K of the relay and the second control signal output of the first controller form a common contact, which constitutes the negative terminal J-of the control switch of this embodiment, due to the co-linearity.
Referring to fig. 3, the first controller mainly comprises a resistor R1, a triode Q1, an isolation transformer T, a resistor R2, a diode D1 and a diode D2; the isolation transformer T has primary positive and negative terminals and secondary positive and negative terminals.
One end of the resistor R1 is the control signal input end of the first controller; the other end of the resistor R1 is electrically connected with the base electrode of the triode Q1; the emitter of the triode Q1 is grounded; the collector electrode of the triode Q1 is electrically connected with the primary side negative electrode wiring terminal of the isolation transformer T; the positive terminal of the secondary side of the isolation transformer T is electrically connected with one end of a resistor R2; the other end of the resistor R2 and the cathode of the diode D1 form a common contact point due to collineation, and the common contact point is the first control signal output end of the first controller; the positive electrode of the diode D1 is connected in series with the positive electrode of the diode D2; the cathode of the diode D2 and the cathode terminal of the secondary side of the isolation transformer T form a common contact because of being collinear, and the common contact is the second control signal output end of the first controller; the primary side positive terminal of the isolation transformer T is the power end of the first controller, and when the isolation transformer T is used, the power end of the first controller is connected with a direct current power VCC output by a matched automatic control system of the transformer substation breaker; the control signal input end of the first controller is connected with the first PWM control signal output end of the matched automatic control system of the transformer substation breaker.
Referring to fig. 4, the second controller mainly comprises a MOS transistor Q2, a diode D3, and a diode D4.
The grid electrode of the MOS tube Q2 is the control signal input end of the second controller; the drain electrode of the MOS transistor Q2 is electrically connected with the cathode of the diode D4; the positive electrode of the diode D4 and the positive electrode of the diode D3 form a common joint because of being collinear, and the common joint is the second control signal output end of the second controller; the negative electrode of the diode D3 is the first control signal output end of the second controller and is also the power end of the second controller; when the automatic control system is used, the power supply of the second controller is connected with a direct current power supply VCC output by a matched automatic control system of the transformer substation breaker; the control signal input end of the second controller is connected with the second PWM control signal output end of the matched automatic control system of the transformer substation breaker.
The control switch in the control loop of the transformer substation breaker of the embodiment, wherein the on-off response time of the IGBT is in the order of tens of microseconds (μs), and the on-off response time of the relay is in the order of milliseconds (ms); the impedance of the IGBT when through-current is in the ohmic level, while the contact impedance of the relay contact K is in the milliohm level.
Still referring to fig. 1 and 2, the control switch in the substation breaker control loop of the present embodiment, when in use, replaces the control switches R1 and R2 in fig. 1. The positive terminal J+ of the control switch of the embodiment is connected with an operation power supply+ of a circuit breaker control loop of a transformer substation, and the negative terminal J-is connected with a current holding relay coil in the circuit breaker control loop; and the first controller and the second controller of the control switch of the embodiment are electrically connected with the matched automatic control system of the transformer substation breaker according to the mode, so that the transformer substation breaker can be put into use.
The working process and principle of the control switch in the control loop of the transformer substation breaker in the embodiment when in use are briefly described below by taking the closing of the breaker as an example:
referring to fig. 5, when the circuit breaker needs to be switched on, the first PWM control signal output end and the second PWM control signal output end of the automatic control system of the transformer substation circuit breaker send on command signals to the first controller and the second controller of the implementation control switch at the same time; since the IGBT on-off response time is in the order of tens of microseconds (μs), and the relay on-off response time is in the order of milliseconds (ms); therefore, at the time t1, the IGBT is firstly conducted, a closing loop of the circuit breaker is closed, and at the moment, a conducting current I flows through the IGBT; at the time t2, the relay contact K is conducted, the impedance is far greater than the contact impedance of the relay contact K when the IGBT is conducted, and the IGBT is connected with the relay contact K in parallel, at the moment, the current I2> > I1 (I1 is the current flowing from the IGBT) passing through the relay contact K, namely the relay contact K bypasses the IGBT, and the conducting current I of a breaker closing loop basically flows from the relay contact K; when the circuit breaker completes the closing operation, the control switch of the embodiment needs to be disconnected at the time t4, so that the process from flowing to no-flowing is realized; for this reason, the second PWM control signal output terminal of the automatic control system of the substation breaker sends a turn-off command signal to the second controller of the implementation control switch at time t3 to turn off the contact K of the relay first; and then, a first PWM control signal output end of the automatic control system of the transformer substation breaker sends a switching-off command signal to a first controller of the implementation control switch at the time t4 to control the IGBT to cut off the on current of a switching-on loop of the breaker.
As can be seen from the foregoing, when the control switch in the control loop of the substation breaker in this embodiment is turned on, the IGBT thereof only bears all the on-current of the loop in the time period t1 to t2 and the time period t3 to t4, which are all in the order of several milliseconds, and the on-current of the loop mainly passes through the contact point K of the relay in the main time period (about 90 ms) where t2 to t3 occupies the majority, so that the occurrence of serious heating or even burning phenomena caused by long-time large-current conduction of the IGBT can be effectively avoided; in addition, the advantage that the on-off response time of the IGBT is in the order of tens of microseconds (mu s) is fully utilized, the quick response to the on-off command of the circuit breaker is realized, the precise control of the on-off moment of the circuit breaker is realized, and the technical requirement of precisely controlling the on-off moment of the circuit breaker is effectively met.
The above embodiments are illustrative of the specific embodiments of the present invention, and not restrictive, and various changes and modifications may be made by those skilled in the relevant art without departing from the spirit and scope of the invention, and all such equivalent technical solutions are intended to be included in the scope of the invention.
Claims (1)
1. A control switch in a substation circuit breaker control loop, characterized by: the intelligent control device comprises an IGBT, a relay, a first controller for controlling the on-off of the IGBT and a second controller for controlling the on-off of the relay;
the IGBT is provided with a grid electrode, a collector electrode and an emitter electrode; the relay is provided with a coil and a contact, and the first controller and the second controller are respectively provided with a power supply end, a control signal input end and a first control signal output end and a second control signal output end;
the grid electrode of the IGBT is electrically connected with the control signal end of the first controller; the positive electrode and the negative electrode of the coil of the relay are correspondingly and electrically connected with the first control signal end and the second control signal end of the second control loop; the collector of the IGBT is connected with one end of a contact of the relay in parallel to form a common contact, and the common contact forms an anode terminal of a control switch in a circuit breaker control loop of the transformer substation; the emitter of the IGBT, the other end of the contact of the relay and the second control signal output end of the first controller form a common contact because of being collinear, and the common contact forms a negative electrode terminal of a control switch in a circuit breaker control loop of the transformer substation;
when the transformer substation circuit breaker control circuit is used, the positive electrode terminal of the control switch in the transformer substation circuit breaker control circuit is electrically connected with the positive electrode of the operation power supply of the transformer substation circuit breaker control circuit, and the negative electrode terminal of the control switch in the transformer substation circuit breaker control circuit is electrically connected with the current holding relay coil in the circuit breaker control circuit; the power ends of the first controller and the second controller are connected with a direct current power supply VCC output by a matched automatic control system of the transformer substation breaker; the control signal input ends of the first controller and the second controller are correspondingly and electrically connected with the first PWM control signal output end and the second PWM control signal output end of the matched automatic control system of the transformer substation breaker;
the first controller comprises a resistor R1, a triode Q1, an isolation transformer T, a resistor R2, a diode D1 and a diode D2;
the isolation transformer T is provided with a primary side positive and negative electrode terminal and a secondary side positive and negative electrode terminal; one end of the resistor R1 is the control signal input end of the first controller; the other end of the resistor R1 is electrically connected with the base electrode of the triode Q1; the emitter of the triode Q1 is grounded; the collector electrode of the triode Q1 is electrically connected with the primary side negative electrode wiring terminal of the isolation transformer T; the positive terminal of the secondary side of the isolation transformer T is electrically connected with one end of a resistor R2; the other end of the resistor R2 and the cathode of the diode D1 form a common contact point due to collineation, and the common contact point is the first control signal output end of the first controller; the positive electrode of the diode D1 is connected in series with the positive electrode of the diode D2; the cathode of the diode D2 and the cathode terminal of the secondary side of the isolation transformer T form a common contact point which is the second control signal output end of the first controller; the primary side positive terminal of the isolation transformer T is the power supply terminal of the first controller;
the second controller comprises a MOS tube Q2, a diode D3 and a diode D4;
the grid electrode of the MOS tube Q2 is the control signal input end of the second controller; the drain electrode of the MOS transistor Q2 is electrically connected with the cathode of the diode D4; the positive electrode of the diode D4 and the positive electrode of the diode D3 form a common joint because of being collinear, and the common joint is the second control signal output end of the second controller; the negative pole of the diode D3 is the first control signal output terminal of the second controller, and is also the power supply terminal of the second controller.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710377673.2A CN108963960B (en) | 2017-05-25 | 2017-05-25 | Control switch in control loop of transformer substation breaker |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710377673.2A CN108963960B (en) | 2017-05-25 | 2017-05-25 | Control switch in control loop of transformer substation breaker |
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| CN108963960A CN108963960A (en) | 2018-12-07 |
| CN108963960B true CN108963960B (en) | 2023-10-27 |
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| CN108963960A (en) | 2018-12-07 |
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