CN210984628U - Driving circuit of rapid tripping relay - Google Patents
Driving circuit of rapid tripping relay Download PDFInfo
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- CN210984628U CN210984628U CN201921723505.5U CN201921723505U CN210984628U CN 210984628 U CN210984628 U CN 210984628U CN 201921723505 U CN201921723505 U CN 201921723505U CN 210984628 U CN210984628 U CN 210984628U
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Abstract
The utility model discloses a drive circuit of a rapid tripping relay, which comprises a direct current voltage source U, a switch K1, a coil K2, an RC parallel circuit and a diode D1; the positive pole of the direct-current voltage source U is connected with the positive pole of the diode D1 through the switch K1, the negative pole of the diode D1 is connected with one end of the RC parallel circuit, the other end of the RC parallel circuit is connected with the positive pole of the coil K2, the negative pole of the coil K2 is connected with the negative pole of the direct-current voltage source U, and the rated working voltage of the coil K2 is smaller than the rated working voltage of the direct-current voltage source U. The utility model discloses a drive circuit of fast tripping relay has the function that shortens relay actuation time, has the function that prevents that the relay from inserting reverse DC voltage source and damaging, has the function of relay coil outage afterflow and arc extinction in the twinkling of an eye, has the function of protection diode and coil.
Description
Technical Field
The utility model relates to a high voltage direct current transmission technical field, concretely relates to drive circuit of fast tripping relay.
Background
The fast tripping relay is used for an alternating current filter protection screen and a direct current protection interface screen of a high-voltage direct current transmission project, when relay protection acts, the protection screen sends a signal to pressurize an excitation coil of the fast tripping relay, and after certain time delay, the relay is closed, namely, a next-stage tripping coil of a circuit breaker is closed, and then the circuit breaker trips. Because relay protection requires rapid shut-off of the fault source, the delay from pressurization to relay closure of the relay is required to be of the order of ms, i.e., the pull-in time of the relay is of the order of ms. Therefore, the pull-in time of the conventional fast tripping relay still needs to be further reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a drive circuit of fast tripping relay when shortening relay actuation time, still has the function that prevents the relay and insert reverse DC voltage source and damage to and relay coil outage follow current and arc extinction function in the twinkling of an eye.
In order to realize the above purpose, the utility model adopts the technical scheme that:
a driving circuit of a quick tripping relay comprises a direct-current voltage source U, a switch K1, a coil K2, an RC parallel circuit and a diode D1; the positive pole of the direct-current voltage source U is connected with the positive pole of the diode D1 through the switch K1, the negative pole of the diode D1 is connected with one end of the RC parallel circuit, the other end of the RC parallel circuit is connected with the positive pole of the coil K2, the negative pole of the coil K2 is connected with the negative pole of the direct-current voltage source U, and the rated working voltage of the coil K2 is smaller than the rated working voltage of the direct-current voltage source U.
In order to protect the diode D1, a piezoresistor RV1 can be additionally arranged and connected in parallel at two ends of the diode D1, the anode of the piezoresistor RV1 is connected with the anode of the diode D1, and the cathode of the piezoresistor RV1 is connected with the cathode of the diode D1.
In order to protect the coil K2, a piezoresistor RV2 can be additionally arranged and connected in parallel at two ends of the coil K2, the positive electrode of the piezoresistor RV2 is connected with the positive electrode of the coil K2, and the negative electrode of the piezoresistor RV2 is connected with the negative electrode of the coil K2. And the circuit design of the piezoresistor RV2 in parallel connection with the coil K2 also has the functions of freewheeling and arc extinction at the moment of power failure of the coil K2.
As an improvement of the utility model, the RC parallel circuit parallelly connected by six resistors R and two condenser C and form, and two arbitrary resistors R or condenser C are parallel structure. By connecting six resistors in parallel, a shunting effect can be generated, and compared with a scheme adopting one resistor, the improved scheme has the advantages that the requirements on heat dissipation and current capacity of the resistor are reduced, and the cost can be reduced. Compared with the scheme adopting one capacitor, the scheme adopting two capacitors connected in parallel has the advantages that the capacitance value of a single capacitor is reduced by half, the volume of the capacitor can be effectively reduced, and the cost of the capacitor can be reduced.
As an improvement of the present invention, the rated operating voltage of the coil K2 is 15% of the rated operating voltage of the dc voltage source U. According to related experiments, when the rated working voltage of the coil K2 is 15% of the rated working voltage of the relay, the pull-in time of the relay can be effectively shortened. For example, when the rated operating voltage of K2 is 16V and the rated operating voltage of the relay is 110V, the pull-in time of the relay is 8ms, and the pull-in time is short.
Compared with the prior art, the beneficial effects of the utility model reside in that:
1. the circuit design of the RC parallel circuit and the coil K2 in series has the function of shortening the pull-in time of the relay, because the rated working voltage of the coil K2 is smaller than the rated working voltage U1 of the direct current voltage source U, when the relay works, the switch K1 is turned on, the voltage at two ends of the capacitor C is zero and can not change suddenly, the coil K2 bears all the voltage of the direct current voltage source U, namely the rated working voltage U1 of the relay, therefore, the current of the coil K2 is rapidly increased, the movable contact of the relay is quickly pulled in to complete the pull-in action, then the voltage of the capacitor C is slowly increased and is divided with the coil K2, the voltage born at two ends of the coil K2 is gradually reduced, and finally when the voltage is stable, the coil K2 works at the rated working.
2. The circuit design of the diode D1 and the coil K2 in series has the function of preventing the relay from being damaged when the relay is connected to a reverse direct current voltage source U, when the polarity of the direct current voltage source U at the two ends of the relay is reversed due to the error of workers, the relay does not pass through current due to the unidirectional conductivity of the diode D1, and the diode D1 bears the reverse direct current voltage source voltage to protect the relay from being damaged; the circuit design that piezo-resistor RV2 and coil K2 are parallelly connected has relay coil K2 outage and follow current in the twinkling of an eye and the function of arc extinction, when the relay outage after the actuation, because coil K2 inductance is very big, the electric current can not break suddenly, can produce very big reverse voltage, at this moment piezo-resistor RV2 switches on, forms closed loop with coil K2, absorbs coil K2 energy, and coil K2 electric current reduces, releases the moving contact.
3. The parallel circuit design of the voltage dependent resistor RV1 and the diode D1 has the function of protecting the diode D1, when the voltage at the two ends of the diode D1 is too high, the resistance value of the voltage dependent resistor RV1 is rapidly reduced, the voltage at the two ends of the diode D1 is clamped, and the diode D1 is protected.
4. The circuit design of the voltage dependent resistor RV2 in parallel connection with the coil K2 also has the function of protecting the coil K2, when the voltage at the two ends of the coil K2 is too high, the resistance value of the voltage dependent resistor RV2 is rapidly reduced, the voltage at the two ends of the coil K2 is clamped, and the coil K2 is protected.
Drawings
Fig. 1 is a schematic circuit diagram of a driving circuit of the fast trip relay of the present invention.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Referring to fig. 1, a driving circuit of a fast trip relay of the present embodiment includes a dc voltage source U of 110V, a switch K1, a coil K2 with a rated operating voltage of 16V, six resistors R with a resistance of 18K Ω, two capacitors C with a capacitance of 22uF, a diode D1, a voltage dependent resistor RV1, and a voltage dependent resistor RV 2. When the relay needs to work, the switch K1 is closed to enable the direct current voltage source U of 110V to be connected, and when the relay does not need to work, the switch K1 is opened to stop the relay.
Six resistors R and two capacitors C are connected in parallel in pairs to form an RC parallel circuit, a direct-current voltage source U is connected with the anode of a diode D1 through a switch K1, the cathode of the diode D1 is connected with one end of the RC parallel circuit, the other end of the RC parallel circuit is connected with the anode of a coil K2, the cathode of the coil K2 is connected with the cathode of the direct-current voltage source U, a piezoresistor RV1 is connected in parallel at two ends of a diode D1, and a piezoresistor RV2 is connected in parallel at two ends of a coil K2.
The circuit design of the RC parallel circuit and the coil K2 in series connection has the function of shortening the pull-in time of the relay, when the switch K1 is closed, because the voltage at the two ends of the capacitor C is zero and cannot be suddenly changed, the coil K2 bears all the voltage of all the direct current voltage sources U, is 110V and is far higher than the rated working voltage of the coil U by 16V, the pull-in time can be effectively shortened, the pull-in time is determined to be 8ms through experiments, then the voltage at the two ends of the capacitor C gradually rises, the voltage of the coil K2 gradually falls and finally is stabilized at 94V and 16V respectively, and the coil K2 works at the rated working voltage.
The circuit design that diode D1 and coil K2 are established ties has the function that prevents the relay and insert reverse DC voltage source and damage, and when the relay received reverse DC voltage source, the relay did not work, and diode D1 bears whole reverse DC voltage, the protection relay.
The circuit design that piezo-resistor RV2 and coil K2 are parallelly connected has the function of follow current and arc extinction in the moment of relay coil K2 outage, and have the effect of protection coil K2, when the relay outage of actuation, coil K2 produces very big reverse voltage, because the clamping effect of piezo-resistor RV2, with the voltage clamp at coil K2 both ends at-94V, protection coil K2, provide the through-flow return circuit for coil K2's electric current simultaneously, prevent that coil K2 both ends from producing the electric arc, piezo-resistor RV2 has played the effect of follow current and arc extinction.
The above detailed description is specific to possible embodiments of the present invention, and the embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the scope of the present invention should be included within the scope of the present invention.
Claims (5)
1. A drive circuit of a fast tripping relay is characterized in that: the DC voltage source U, the switch K1, the coil K2, the RC parallel circuit and the diode D1 are included; the positive pole of the direct-current voltage source U is connected with the positive pole of the diode D1 through the switch K1, the negative pole of the diode D1 is connected with one end of the RC parallel circuit, the other end of the RC parallel circuit is connected with the positive pole of the coil K2, the negative pole of the coil K2 is connected with the negative pole of the direct-current voltage source U, and the rated working voltage of the coil K2 is smaller than the rated working voltage of the direct-current voltage source U.
2. The drive circuit for a rapid trip relay according to claim 1, wherein: the voltage-dependent resistor RV1 is connected in parallel at two ends of the diode D1, the anode of the voltage-dependent resistor RV1 is connected with the anode of the diode D1, and the cathode of the voltage-dependent resistor RV1 is connected with the cathode of the diode D1.
3. The drive circuit for a rapid trip relay according to claim 1, wherein: the voltage-dependent resistor RV2 is connected in parallel at two ends of the coil K2, the positive electrode of the voltage-dependent resistor RV2 is connected with the positive electrode of the coil K2, and the negative electrode of the voltage-dependent resistor RV2 is connected with the negative electrode of the coil K2.
4. A drive circuit for a rapid trip relay according to any one of claims 1-3, characterized in that: the RC parallel circuit is formed by connecting six resistors R and two capacitors C in parallel, and any two resistors R or any two capacitors C are of a parallel structure.
5. A drive circuit for a rapid trip relay according to any one of claims 1-3, characterized in that: the rated working voltage of the coil K2 is 15% of the rated working voltage of the direct-current voltage source U.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921723505.5U CN210984628U (en) | 2019-10-14 | 2019-10-14 | Driving circuit of rapid tripping relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921723505.5U CN210984628U (en) | 2019-10-14 | 2019-10-14 | Driving circuit of rapid tripping relay |
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| Publication Number | Publication Date |
|---|---|
| CN210984628U true CN210984628U (en) | 2020-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921723505.5U Active CN210984628U (en) | 2019-10-14 | 2019-10-14 | Driving circuit of rapid tripping relay |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110739180A (en) * | 2019-10-14 | 2020-01-31 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | drive circuit of quick tripping relay |
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2019
- 2019-10-14 CN CN201921723505.5U patent/CN210984628U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110739180A (en) * | 2019-10-14 | 2020-01-31 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | drive circuit of quick tripping relay |
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