CN109994340B - A repeat circuit and control method thereof - Google Patents
A repeat circuit and control method thereof Download PDFInfo
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- CN109994340B CN109994340B CN201910217444.3A CN201910217444A CN109994340B CN 109994340 B CN109994340 B CN 109994340B CN 201910217444 A CN201910217444 A CN 201910217444A CN 109994340 B CN109994340 B CN 109994340B
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000000670 limiting effect Effects 0.000 claims abstract description 17
- 230000001172 regenerating effect Effects 0.000 claims 2
- 238000003780 insertion Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
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Abstract
The invention provides a heavy circuit and a control method thereof, wherein the heavy circuit comprises a threshold control unit, a voltage limiting unit and a contact output unit, wherein the threshold control unit comprises four threshold resistors which are connected in parallel and in series in a current loop of a trip coil; the voltage limiting unit comprises two groups of diodes which are connected in parallel in an opposite direction, each group of diodes comprises two diodes which are connected in series in the same direction, and the threshold control unit is connected into the current loop in parallel; the contact output unit comprises two relays connected in parallel, and the contact output unit is also connected into the current loop in parallel. By implementing the invention, the action threshold of the relay can be set, the relay is effectively prevented from being operated by mistake, the voltage is limited when the current is larger, the relay is protected, the influence on a tripping loop is reduced, and a sensitive and reliable re-operation signal is provided.
Description
Technical Field
The invention relates to the technical field of power system automation, in particular to a reset circuit and a control method thereof.
Background
For accurately judging the transformer substation interval tripping by the automatic equipment of the power system, such as a safety and stability control device, a criterion of combining an electrical quantity with a switching value is adopted, wherein the switching value is a switching tripping signal of a field breaker. The trip signal-based criterion requires sensitive and reliable signal action, and although some devices can obtain the trip signal through equipment such as relay protection and the like, the signal cannot completely reflect the actual working state of the trip coil of the circuit breaker, so that certain limitations exist. In addition, although the traditional circuit breaker protection device can output trip signals, the quantity is small, the actual requirements cannot be met, and a separate re-acting unit needs to be configured.
At present, there are two methods for realizing the re-operation of the trip signal: 1) the tripping signal of the circuit breaker protection device is reset to meet the requirement on the quantity, and the mode has the obvious defect that the time delay is increased due to the addition of a primary circuit, so that the situation with higher requirement on partial high-speed performance cannot be met; 2) the intermediate current type relay is directly added in the tripping circuit, the requirement on the current type relay is high, overheating exists when the relay is not used properly, the risk of burning the relay is avoided, and potential safety hazards are brought.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a reset circuit and a control method thereof, so as to satisfy the requirement of sensitivity and reliability of a trip signal, and simultaneously provide a sufficient number of contact signals.
In order to solve the above-mentioned technical problem, the present invention provides a reset circuit, comprising a threshold control unit, a voltage limiting unit and a contact output unit,
the threshold control unit comprises four threshold resistors which are connected in parallel and in series in a current loop of the trip coil;
the voltage limiting unit comprises two groups of diodes which are connected in parallel in an opposite direction, each group of diodes comprises two diodes which are connected in series in the same direction, and the threshold control unit is connected into the current loop in parallel;
the contact output unit comprises two relays connected in parallel, and the contact output unit is also connected into the current loop in parallel.
Wherein the threshold resistance is a power resistance, and the rated power is at least 3W.
The first group of diodes comprise a first diode and a second diode which are connected in series in the same direction, the anode of the first diode is connected with the current anode input end of the current loop, the cathode of the second diode is connected with the current cathode input end of the current loop, the second group of diodes comprise a third diode and a fourth diode which are connected in series in the same direction, the cathode of the third diode is connected with the current anode input end of the current loop, and the anode of the fourth diode is connected with the current cathode input end of the current loop.
Wherein, the diode is a rectifier diode, and the forward voltage and the reverse voltage are limited within 1.5V.
The invention also provides a control method of the reclosing circuit, which comprises the following steps:
under the condition of different rated currents, when the input current reaches a set threshold value, the relay contact is closed to output by adjusting the resistance value of the threshold resistor of the threshold control unit; or the action current threshold of the relay can be adjusted under the condition of realizing the same rated current by adjusting the resistance value of the threshold resistor of the threshold control unit.
When the input current is reversed, the relay does not act.
When the input current is too large, redundant current passes through the voltage limiting unit, and the voltage is limited within a certain range.
Wherein, from the input current of the current loop input end of the trip coil to the action of the relay contact, the time delay is less than 15 ms.
The embodiment of the invention has the beneficial effects that: the relay action threshold value can be set, relay misoperation is effectively prevented, voltage is limited when current is large, the relay is protected, the influence on a tripping circuit is reduced, and a sensitive and reliable re-action signal is provided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a reset circuit according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a test structure under different parameter settings according to a first embodiment of the present invention.
Detailed Description
The following description of the embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced.
Referring to fig. 1, a reset circuit according to an embodiment of the present invention includes a threshold control unit I, a voltage limiting unit II and a node output unit III, wherein the threshold control unit I includes four threshold resistors (R1, R2, R3, R4) connected in series in a current loop of a trip coil in parallel; the voltage limiting unit II comprises two groups of diodes which are connected in parallel in an opposite direction, each group of diodes comprises two diodes (D1, D2; D3, D4) which are connected in series in the same direction, and the threshold control unit II is connected into the current loop in parallel; the junction output unit III comprises two relays (J1, J2) connected in parallel, and is also connected in parallel into the current loop.
Specifically, the threshold control unit I, the voltage limiting unit II and the contact output unit III are all connected in parallel to a current loop of the trip coil, threshold resistors R1-R4 in the threshold control unit I are power resistors, and rated power is at least 3W; diodes D1-D4 in the voltage limiting unit II are rectifier diodes, forward and reverse voltages are limited within 1.5V, wherein the first group of diodes comprise a first diode D1 and a second diode D2 which are connected in series in the same direction, the anode of the first diode D1 is connected with the current anode input end of the current loop, the cathode of the second diode D2 is connected with the current cathode input end of the current loop, the second group of diodes comprise a third diode D3 and a fourth diode D4 which are connected in series in the same direction, the cathode of the third diode D3 is connected with the current anode input end of the current loop, and the anode of the fourth diode D4 is connected with the current cathode input end of the current loop; the first relay J1 and the second relay J2 of the contact output unit III each include a normally open contact (5, 6) and a normally closed contact (7, 8). The input current flows through threshold resistors R1-R4 of the threshold control unit I to generate voltage drop, and the voltage is limited by a diode of the voltage control unit II to provide driving voltage for a relay coil, so that the two relays J1 and J2 are driven to carry out multi-way joint output. The diode of the voltage limiting unit II limits the voltage of the coil of the relay, so that the relay can be protected, and the influence on a tripping loop is reduced. Two relays of the contact output unit III adopt low rated voltage relays to reduce voltage drop and reduce the influence on a loop.
When the input current reaches an action threshold, the relay acts, and the normally open contact is closed to output; the input current continues to increase, the current flowing through the threshold resistors R1, R2, R3 and R4 which are connected in parallel increases, the generated voltage drop increases, the diode is connected in parallel in a current loop, the voltage at two ends of the diode increases along with the increase, the current flowing through the diode rapidly increases after the forward voltage reaches the dead zone voltage according to the volt-ampere characteristic curve of the diode, and the redundant current returns through the diode, so that the voltage limiting effect is achieved, and the relay coil is protected.
Because the threshold control unit, the voltage limiting unit and the contact output unit are connected in parallel and then connected in series in the current loop, the current is distributed in each unit according to the inverse proportion of the resistance value, the influence of the coil resistances of the relays J1 and J2 is fully considered when the threshold resistors R1-R4 are arranged, and the nonlinear influence of the diodes is considered when the current is overlarge.
The current loop of the trip coil generally has several typical rated current values of 1A, 2A and 4A due to different impedances, and when the rated value is 1A, the parameters of each element in the circuit are as follows:
R1-R4 adopt a direct insertion power resistor with the resistance value of 12 omega and the rated power of 3W, and D1-D4 adopt a diode 1N 5408; the relays J1 and J2 adopt ST 2-DC1.5V-H57.
For the rated value 2A, the parameters of each element in the circuit are as follows:
R1-R4 adopt a direct-insertion power resistor with the resistance value of 4.7 omega and the rated power of 3W, and D1-D4 adopt a diode 1N 5408; the relays J1 and J2 adopt ST 2-DC1.5V-H57.
For the rated value of 4A, the parameters of each element in the circuit are as follows:
R1-R4 adopt a direct insertion power resistor with the resistance value of 2 omega and the rated power of 3W, and D1-D4 adopt a diode 1N 5408; the relays J1 and J2 adopt ST 2-DC1.5V-H57.
The test results under different parameters are shown in fig. 2, and due to the discreteness of the device, the action current threshold value has a certain range, meets the set rated value of 30% -50%, and the return coefficient is larger than 0.3.
Corresponding to the second embodiment of the present invention, the second embodiment of the present invention further provides a driving method thereof, including the following steps:
under the condition of different rated currents, when the input current reaches a set threshold value, the relay contact is closed to output by adjusting the resistance value of the threshold resistor of the threshold control unit; or the action current threshold of the relay can be adjusted under the condition of realizing the same rated current by adjusting the resistance value of the threshold resistor of the threshold control unit. For example, if the rated value of the input current is 1A and the relay needs 0.5A to operate, the operation can be realized by adjusting the resistance value of the threshold resistor of the threshold control unit; from another perspective, a nominal input current of 1A, the threshold resistance of the threshold control unit can be adjusted to operate the relay at a set operating threshold, such as 0.6A, or 0.7A.
When the input current is in the reverse phase, the relay does not act;
when the input current is too large, redundant current passes through the voltage limiting unit, and the voltage is limited within a certain range. When the voltage drop generated by the current flowing through the threshold control unit and the coil of the relay output unit exceeds the rated voltage of the coil of the relay, the current can be considered to be overlarge. Since the diode is a nonlinear device, the current flowing through the diode is nonlinear as the voltage across the diode increases, and a wider current range can be realized by selecting a proper diode.
And from the input of current from the input end of the current loop of the trip coil to the action of the relay contact, the time delay is less than 15 ms.
As can be seen from the above description, the embodiments of the present invention have the following beneficial effects: the relay action threshold value can be set, relay misoperation is effectively prevented, voltage is limited when current is large, the relay is protected, the influence on a tripping circuit is reduced, and a sensitive and reliable re-action signal is provided.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (8)
1. A reset circuit includes a threshold control unit, a voltage limiting unit, and a contact output unit,
the threshold control unit comprises four threshold resistors which are connected in parallel and in series in a current loop of the trip coil;
the voltage limiting unit comprises two groups of diodes which are connected in parallel in an opposite direction, each group of diodes comprises two diodes which are connected in series in the same direction, and the threshold control unit is connected into the current loop in parallel;
the contact output unit comprises two low rated voltage relays which are connected in parallel, and is also connected into the current loop in parallel; the input current flows through the threshold resistor of the threshold control unit to generate voltage drop, and the voltage is limited by the diode of the voltage limiting unit to provide driving voltage for the coil of the relay so as to drive the two relays to output multi-path contacts.
2. The reset circuit of claim 1, wherein the threshold resistor is a power resistor having a power rating of at least 3W.
3. The regenerative circuit of claim 1, wherein the first group of diodes includes a first diode and a second diode connected in series in a same direction, an anode of the first diode is connected to the positive current input terminal of the current loop, a cathode of the second diode is connected to the negative current input terminal of the current loop, the second group of diodes includes a third diode and a fourth diode connected in series in a same direction, a cathode of the third diode is connected to the positive current input terminal of the current loop, and an anode of the fourth diode is connected to the negative current input terminal of the current loop.
4. A reset circuit according to claim 3 wherein the diodes are rectifier diodes and the forward and reverse voltages are limited to within 1.5V.
5. A method of controlling a regenerative circuit according to any of claims 1 to 4, comprising the steps of:
under the condition of different rated currents, when the input current reaches a set threshold value, the relay contact is closed to output by adjusting the resistance value of the threshold resistor of the threshold control unit; or the action current threshold of the relay can be adjusted under the condition of realizing the same rated current by adjusting the resistance value of the threshold resistor of the threshold control unit, and the relay is a low rated voltage relay.
6. The control method of claim 5, wherein the relay is not actuated when the input current is reversed.
7. The control method according to claim 5, wherein an excessive current passes through the voltage limiting unit when the input current is excessive, and the voltage is limited within a certain range.
8. The control method of claim 5, wherein the time delay from the time the current is input to the current loop input of the trip coil to the time the relay contacts are actuated is less than 15 ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910217444.3A CN109994340B (en) | 2019-03-21 | 2019-03-21 | A repeat circuit and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910217444.3A CN109994340B (en) | 2019-03-21 | 2019-03-21 | A repeat circuit and control method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN109994340A CN109994340A (en) | 2019-07-09 |
| CN109994340B true CN109994340B (en) | 2021-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910217444.3A Active CN109994340B (en) | 2019-03-21 | 2019-03-21 | A repeat circuit and control method thereof |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111380156B (en) * | 2020-03-19 | 2021-11-23 | 海信（山东）空调有限公司 | Control circuit, control chip and air conditioning system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101425428A (en) * | 2007-11-02 | 2009-05-06 | 上海申瑞电力科技股份有限公司 | Reacting electric relay device for electric power |
| CN201527933U (en) * | 2009-10-30 | 2010-07-14 | 许继集团有限公司 | Driving circuit for tripping and closing coil |
| CN102270546A (en) * | 2010-06-07 | 2011-12-07 | 鸿富锦精密工业（深圳）有限公司 | Drive circuit of relay |
| CN203631433U (en) * | 2013-12-30 | 2014-06-04 | 浙江南瑞电力自动化有限公司 | A universal type circuit breaker self-hold circuit |
| CN108288565A (en) * | 2018-01-25 | 2018-07-17 | 南京御弟哥哥电气有限公司 | A kind of anti-interference relay circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6185337B2 (en) * | 2013-08-26 | 2017-08-23 | 株式会社トランストロン | Relay circuit diagnostic device and diagnostic method |
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2019
- 2019-03-21 CN CN201910217444.3A patent/CN109994340B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101425428A (en) * | 2007-11-02 | 2009-05-06 | 上海申瑞电力科技股份有限公司 | Reacting electric relay device for electric power |
| CN201527933U (en) * | 2009-10-30 | 2010-07-14 | 许继集团有限公司 | Driving circuit for tripping and closing coil |
| CN102270546A (en) * | 2010-06-07 | 2011-12-07 | 鸿富锦精密工业（深圳）有限公司 | Drive circuit of relay |
| CN203631433U (en) * | 2013-12-30 | 2014-06-04 | 浙江南瑞电力自动化有限公司 | A universal type circuit breaker self-hold circuit |
| CN108288565A (en) * | 2018-01-25 | 2018-07-17 | 南京御弟哥哥电气有限公司 | A kind of anti-interference relay circuit |
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| CN109994340A (en) | 2019-07-09 |
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