CN2640094Y - Three-phase operation box - Google Patents
Three-phase operation box Download PDFInfo
- Publication number
- CN2640094Y CN2640094Y CN 03247295 CN03247295U CN2640094Y CN 2640094 Y CN2640094 Y CN 2640094Y CN 03247295 CN03247295 CN 03247295 CN 03247295 U CN03247295 U CN 03247295U CN 2640094 Y CN2640094 Y CN 2640094Y
- Authority
- CN
- China
- Prior art keywords
- tripping
- closing
- relay
- coil
- switching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000000903 blocking effect Effects 0.000 claims description 10
- 230000009471 action Effects 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Images
Landscapes
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The utility model relates to a three-phase operation box, which aims to solve the problem of matching difficulty existing between the tripping and closing coils of a current type tripping and closing block relay and a circuit breaker, the utility model also adds a plurality of tripping and closing starting relays matched with the tripping and closing block relay; the tripping and closing starting relays are all voltage type relays; and a tripping and closing constant voltage branch circuit is respectively connected in parallel with the two ends of the tripping and closing starting relay. When the loop current changes in the range of 0.25A to 10.0A, the voltage between the two ends of the coil of the tripping and closing starting relay basically keeps constant; the voltage can make the tripping and closing starting relay take action, then drives the tripping and closing block relay to take action, and finally makes the corresponding tripping and closing coil of the circuit breaker be electrified and take action, realizing the tripping and closing function. The utility model is also suitable for a split-phase operation box, and has the advantages that both the tripping and closing starting relay and the block relay are not constrained by the rated current of the tripping and closing coil of the circuit breaker.
Description
Technical Field
The utility model relates to a three-phase operation case for realizing electric power automated control, applicable three-phase switch in single circuit breaker single trip coil, single circuit breaker double trip coil.
Background
According to the requirements of the power department, a three-phase or split-phase operation box is adopted at the control outlet of the power transmission/supply line of the alternating current power supply. Taking a three-phase operation box as an example, a three-phase alternating current power supply input from the outside is connected to an input end of a circuit breaker, and then is output to corresponding electric equipment through an output end of the circuit breaker. In order to control the closing and tripping of the circuit breaker, a corresponding control and monitoring circuit is also installed, as shown in fig. 1, a secondary wiring schematic diagram of a 10KV three-phase operation box is shown, wherein current relays (including a closing latching relay HBJ and a tripping latching relay TBJ) are adopted to realize the self-holding and anti-tripping functions of the circuit breaker. When a manual closing signal or a remote control closing signal is input, the coil of the closing blocking relay HBJ is electrified, the contact HBJ1 is closed, even if the closing signal disappears, the positive power supply can be connected to the closing coil HC of the circuit breaker through the contact HBJ1 and the coil of the closing blocking relay HBJ, the closing coil HC of the circuit breaker is in an electrified state before the closing function is completed, and therefore the circuit breaker is closed. Also, when a manual trip or remote control trip signal is inputted, the coil of the trip blocking relay TBJ is energized and the contact TBJ4 thereof is closed, and at this time, even if the trip signal has disappeared, the positive power source is connected to the breaker trip coil TQ through the contact TBJ4 and the coil of the trip blocking relay TBJ, ensuring that the breaker trip coil TQ is energized, thereby tripping the breaker.
Fig. 2 shows a schematic diagram of a secondary wiring of a 110KV three-phase operation box, in which a closing latching relay HBJ and a tripping latching relay TBJ are also used to realize the self-holding and anti-tripping functions of the circuit breaker, and the details are not described herein.
In the prior art, because the tripping and closing coils of different circuit breakers have different rated currents, for example, the rated currents may be 0.5A to 8A, different current relays are correspondingly required to meet the requirements of the circuit breakers, the current relays are usually selected according to 30-50% of the rated currents of the tripping and closing coils of the circuit breakers, and for example, when the rated current of the closing coil is 8A, a closing latching relay with the rated current of 4A is selected to be connected with the switching latching relay. The grading of the existing current relay has only four specifications: 0.5A, 1.0A, 2.0A, 4.0A. Due to the limited specification of the current relay, according to the wiring mode shown in fig. 1 and fig. 2, complete matching between the current relay and the circuit breaker is difficult to realize, so that the working performance of the whole three-phase operation box is difficult to guarantee. In addition, for circuit breakers of different specifications, because the matched current relay needs to be selected each time, the specification of the circuit breaker must be determined first, and then a proper relay can be selected, which brings great inconvenience to production and assembly, for example, when the circuit breaker is not purchased, the current relay of which specification needs to be adopted cannot be determined.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned defect of prior art, the utility model discloses solve the problem of the matching difficulty that exists between the tripping/closing coil in tripping/closing blocking relay and the circuit breaker, make tripping/closing blocking relay no longer receive the rated current restraint of the tripping/closing coil in the circuit breaker.
In order to solve the problems, the tripping/closing start relay matched with the tripping/closing locking relay is additionally arranged in the three-phase operation box, and the tripping/closing start relay is a voltage type relay; the two ends of the coil of the tripping/closing starting relay are respectively connected with tripping/closing constant voltage branches in parallel, and the tripping/closing constant voltage branches are used for shunting tripping/closing current and converting the tripping/closing current into constant voltage;
the first end of the coil of the closing latching relay is connected to the input end of the positive power supply through a normally open contact of the closing starting relay, and the second end of the coil of the closing latching relay is connected to the input end of the negative power supply; the first end of the coil of the switching-on starting relay is connected to the input end of a switching-on signal and is also connected to the input end of a positive power supply through a normally open contact of the switching-on locking relay, and the second end of the coil of the switching-on starting relay is connected to the input end of a negative power supply through the switching-on coil of the circuit breaker;
the first end of the coil of the tripping locking relay is connected to the input end of the positive power supply through a normally open contact of the tripping starting relay, and the second end of the coil of the tripping locking relay is connected to the input end of the negative power supply; the trip start relay coil has a first end connected to the trip signal input and also connected to the positive power input via a normally open contact of the trip lockout relay, and a second end connected to the negative power input via the trip coil of the circuit breaker.
The utility model discloses an in the three-phase operation box, can adopt one or many in the constant voltage branch road of tripping/combined floodgate with the tripping/combined floodgate diode branch road that tripping/combined floodgate starting relay coil's both ends are parallelly connected, are established ties by two or more diodes and constitute, the positive terminal of tripping/combined floodgate diode branch road is connected with the first end of tripping/combined floodgate starting relay coil. In addition, two ends of each diode can be connected with one or more spare diodes with the same specification in parallel in the same direction.
The utility model discloses an in the three-phase operation box, the available rectifier bridge of diode in the constant voltage branch road of switching on/off replaces, the anodal output termination of rectifier bridge the first end of switching on/off start relay coil, negative pole output termination the second end of switching on/off start relay coil. In the tripping/closing constant-voltage branch, two alternating current input ends of the rectifier bridge can be in short circuit, and a radiator can be arranged on the rectifier bridge to ensure the radiating effect of the rectifier bridge.
The utility model discloses an in the three-phase operation box, still can include in the constant voltage branch road of tripping/combined floodgate with the parallelly connected tripping/combined floodgate resistance branch road in both ends of tripping/combined floodgate starting relay coil. When the tripping/closing latching relay is a voltage type relay, the second end of the tripping/closing latching relay is connected to the input end of the negative power supply through a tripping/closing latching resistor.
The scheme of the utility model is also applicable to a phase splitting operation box, after the scheme of the utility model is adopted, because the tripping/closing start relay is added to be respectively matched with the tripping/closing blocking relay, the tripping/closing blocking relay is used for starting, and the closing blocking relay is used for keeping; the constant voltage branch circuits connected in parallel at two ends of the coil of the tripping/closing starting relay can ensure that the voltage type tripping/closing starting relay works in a constant voltage and low current state, and most of current flows through the diode in the constant voltage branch circuit, so that the tripping/closing starting relay and the tripping/closing latching relay are not restricted by rated current of a tripping/closing coil in a circuit breaker, the self-adaptive range is 0.25-10A, and no discontinuous grade difference exists. Additionally, the utility model discloses in, the action time of tripping/closing a floodgate is faster, and the overload capacity obviously strengthens.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
FIG. 1 is a schematic diagram of secondary wiring of a 10KV three-phase operation box in the prior art;
FIG. 2 is a schematic diagram of a secondary wiring of a 110KV three-phase operation box in the prior art;
FIG. 3 is a graph showing the PN junction characteristics of the diode;
FIG. 4 is a schematic diagram of the PN junction characteristics of a diode at different temperatures;
fig. 5, 6, 7 and 8 are schematic diagrams of four types of constant voltage branches connected in parallel at two ends of a coil of a closing or tripping starting relay in the present invention;
FIG. 9 is a schematic diagram of the secondary wiring of a 10KV three-phase operation box of the present invention;
fig. 10 is a schematic diagram of the secondary wiring of a 110KV three-phase operation box of the present invention.
Detailed Description
The utility model mainly utilizes the forward conduction characteristic of the diode, as shown in figure 3, when the diode is conducted, no matter how large the current flows, the voltage drop at the two ends of the diode is basically unchanged, and the forward conduction voltage drop is usually 0.7V; in addition, the utility model provides a closing start relay and tripping operation start relay all adopt voltage type relay, and its rated voltage is lower, can select the voltage type relay that rated voltage is 1.5V for example, and its minimum reliable action voltage is 1.13V, and the long-term permission is exerted voltage and is 1.725V.
Since the rated voltage of the voltage-type relay is equivalent to the conduction voltage drop of two diodes connected in series, a constant voltage can be realized by a circuit as shown in fig. 5. The two ends of the coil of the relay (which can be a closing starting relay or a tripping starting relay) are connected in parallel with a diode branch consisting of two diodes connected in series. When current is input from the left side, the two diodes connected in series are conducted, and the sum of conduction voltage drops of the two diodes is 1.4V and is greater than the minimum reliable action voltage of the relay by 1.13V, so that the relay can work in a power-on action state. When the circuit is adopted, most current flows through the diode, and only a small part of current (usually less than 10mA) flows through the relay, so that the reliable operation current range is large, and the reliable operation current range can be suitable from 0.25A to 10A or even higher.
As can be seen from fig. 3, when the current flowing through the diode becomes larger, the voltage drop across the diode will be slightly increased, and the increase of the voltage can increase the action speed of the voltage relay, which is beneficial to the working characteristics of the whole operation box; as can be seen from fig. 4, when the current flowing through the diode is longer, the temperature thereof increases, the voltage drop across the diode is slightly reduced, and the voltage reduction is favorable for the heat resistance of the voltage relay, so that the heat resistance of the whole circuit is improved.
As can be seen from fig. 3, when the current input from the left side is small (for example, 0.05A), the diode can be turned on, so that the relay can operate at a small current, which is not favorable for its interference resistance. As shown in fig. 6, in order to solve this problem, a resistor with a resistance of 5 ohms is connected in parallel to the resistor shown in fig. 5, when the current is small, the voltage generated on the resistor cannot start the relay, and when 0.25A of current flows, the voltage at two ends of the resistor is 1.25V, which is greater than the minimum reliable operation voltage of the relay by 1.13V, so that the reliable operation of the relay can be ensured. That is, the lowest constant voltage value when the current is small is realized by the resistor, and the constant voltage value when the current is large is realized by the rectifier bridge.
In order to prevent the reliable operation of the whole circuit from being affected after a certain diode is damaged, a spare diode branch can be connected in parallel as shown in fig. 7, or a spare diode can be connected in parallel at two ends of each diode as shown in fig. 8.
In addition, a high-power rectifier bridge can be used to replace the four diodes in fig. 7 and 8, in fig. 7, the negative output end of the rectifier bridge is connected to the left side of the relay coil, the positive output end of the rectifier bridge is connected to the right side of the relay coil, and the two alternating current input ends are suspended. In fig. 8, it is equivalent to connect the negative output terminal of the rectifier bridge to the left side of the relay coil, connect the positive output terminal to the right side of the relay coil, and short-circuit the two ac input terminals to each other. In addition, a radiator can be arranged on the high-power rectifier bridge to ensure the radiating effect of the high-power rectifier bridge, so that the reliable work of the whole circuit is ensured.
It can be seen from the above analysis that the constant voltage branches in different forms are all used to shunt the flowing current and convert the current into a constant voltage, so as to ensure the reliable operation of the relay.
Fig. 9 shows a schematic diagram of a secondary wiring diagram of a 10KV three-phase operation box of the present invention, which is an improvement of fig. 1, wherein the scheme shown in fig. 8 is adopted. The switching-on starting relay 1J matched with the switching-on locking relay HBJ is added, and a resistor 14R and a rectifier bridge 1U are connected in parallel at two ends of the switching-on starting relay. The left end of the coil of the closing latching relay is connected to the input end of the positive power supply through a normally open contact of the closing starting relay 1J, and the right end of the coil of the closing latching relay is connected to the input end of the negative power supply through the closing latching resistor 3R; the left end of the coil of the closing starting relay is connected to the input end of a closing signal, and is also connected to the input end of a positive power supply through a normally open contact HBJ1 of the closing latching relay, and the right end of the coil of the closing starting relay is connected to the input end of a negative power supply through a closing coil HC of the circuit breaker.
When a manual closing or remote control closing signal is input, due to the constant voltage action of the resistor 14R or the rectifier bridge 1U, the coil of the closing starting relay 1J is electrified, the normally open contact of the coil is closed, the starting function is realized, and the left end of the coil of the closing latching relay coil HBJ is electrified after being connected with a positive power supply.
After the closing locking relay is electrified, the normally open contact HBJ1 is closed, the left end of the coil of the closing starting relay is connected with the positive power supply, and at the moment, even if a closing signal disappears, the positive power supply can be connected to the closing coil HC of the circuit breaker through the contact HBJ1, so that the closing coil HC of the circuit breaker is electrified to act, and the closing function is realized.
The operation principle of tripping is similar to that of the prior art, and is not described in detail herein.
Fig. 10 shows a schematic diagram of a secondary wiring of a 110KV three-phase operation box of the present invention, which is an improvement of fig. 2, and also adopts the scheme shown in fig. 8, and details thereof are not described here.
According to the analysis and the embodiment, when the loop current changes from 0.25A to 10.0A, the voltage at two ends of the coil of the tripping/closing starting relay is basically constant, and the voltage can enable the tripping/closing starting relay to act, so that the tripping/closing latching relay is driven to act, and finally the corresponding tripping/closing coil in the circuit breaker is electrified to act, and the tripping/closing function is realized.
The tripping/closing starting relay and the tripping/closing locking relay in the embodiment are both voltage type relays, the relays are not limited by rated currents of tripping/closing coils in the circuit breaker any more, the self-adaptive range of the relays is 0.25-10A, no intermittent step difference exists, and compared with the prior art which only has four current values of 0.5A, 1.0A, 2.0A and 4.0A, the advantages of the relays are very obvious, and the problem of whether the tripping/closing locking relay is matched with the tripping/closing coils in the circuit breaker is not needed to be considered any more.
In fig. 1 and 2, the tripping/closing action time is slightly 16 ms; in fig. 9 and 10, the tripping/closing operation time is less than 15 ms.
In addition, in fig. 1 and 2, the overload capacity of the tripping/closing latching relay is 2 times of the rated current, and the time is 2 minutes; in fig. 9 and 10, the overload capacity of the trip/close start relay is obviously enhanced, and the trip/close start relay can work for 3 minutes under the current of 10A.
The scheme of the utility model also can be applicable to the phase separation control box, and its embodiment is similar with the implementation mode of three-phase control box, and the details are not given here again.
Claims (8)
1. A three-phase operation box comprises a closing locking relay and a tripping locking relay for an external circuit breaker; the circuit breaker is characterized by also comprising a closing starting relay matched with the closing locking relay and a tripping starting relay matched with the tripping locking relay; the closing starting relay and the tripping starting relay are both voltage type relays; a closing constant voltage branch is connected in parallel with two ends of the closing starting relay coil, and a tripping constant voltage branch is connected in parallel with two ends of the tripping starting relay coil; wherein,
the first end of the coil of the closing latching relay is connected to the input end of the positive power supply through a normally open contact of the closing starting relay, and the second end of the coil of the closing latching relay is connected to the input end of the negative power supply; the first end of the coil of the switching-on starting relay is connected to the input end of a switching-on signal and is also connected to the input end of a positive power supply through a normally open contact of the switching-on locking relay, and the second end of the coil of the switching-on starting relay is connected to the input end of a negative power supply through the switching-on coil of the circuit breaker;
the first end of the coil of the tripping locking relay is connected to the input end of the positive power supply through a normally open contact of the tripping starting relay, and the second end of the coil of the tripping locking relay is connected to the input end of the negative power supply; the trip start relay coil has a first end connected to the trip signal input and also connected to the positive power input via a normally open contact of the trip lockout relay, and a second end connected to the negative power input via the trip coil of the circuit breaker.
2. Three-phase control box according to claim 1,
the switching-on constant voltage branch circuit at least comprises a switching-on diode branch circuit which is connected with two ends of a switching-on starting relay coil in parallel and is formed by connecting two or more diodes in series, and the positive end of the switching-on diode branch circuit is connected with the first end of the switching-on starting relay coil;
the tripping constant voltage branch circuit at least comprises a tripping diode branch circuit which is connected with two ends of the tripping starting relay coil in parallel and is formed by connecting two or more diodes in series, and the positive end of the tripping diode branch circuit is connected with the first end of the tripping starting relay coil.
3. The three-phase operating box of claim 2, wherein one or more spare diodes of the same size are also connected in parallel in the same direction across each of the diodes in the closing diode branch and the tripping diode branch.
4. Three-phase control box according to claim 1,
the switching-on constant voltage branch comprises a rectifier bridge, the positive output end of the rectifier bridge is connected with the first end of the switching-on starting relay coil, and the negative output end of the rectifier bridge is connected with the second end of the switching-on starting relay coil;
the tripping constant voltage branch comprises a rectifier bridge, the positive output end of the rectifier bridge is connected with the first end of the tripping starting relay coil, and the negative output end of the rectifier bridge is connected with the second end of the tripping starting relay coil.
5. The three-phase operating box according to claim 4, wherein in the closing constant voltage branch and the tripping constant voltage branch, two AC input terminals of the rectifier bridge are shorted with each other.
6. A three-phase control box according to claim 4 or 5, characterized in that the rectifier bridge is also provided with a heat sink.
7. Three-phase operation box according to any one of claims 1 to 5,
the switching-on constant voltage branch circuit also comprises a switching-on resistance branch circuit which is connected with two ends of the switching-on starting relay coil in parallel;
and the tripping constant voltage branch circuit also comprises a tripping resistance branch circuit which is connected with two ends of the tripping starting relay coil in parallel.
8. The three-phase operating box according to any one of claims 1 to 5, characterized in that the closing and tripping blocking relays are both voltage-type relays; the second end of the closing locking relay is connected to the negative power supply input end through a closing locking resistor; the second terminal of the trip lockout relay is connected to the negative supply input terminal through a trip lockout resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03247295 CN2640094Y (en) | 2003-06-13 | 2003-06-13 | Three-phase operation box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03247295 CN2640094Y (en) | 2003-06-13 | 2003-06-13 | Three-phase operation box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2640094Y true CN2640094Y (en) | 2004-09-08 |
Family
ID=34292793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03247295 Expired - Lifetime CN2640094Y (en) | 2003-06-13 | 2003-06-13 | Three-phase operation box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2640094Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107591281A (en) * | 2017-09-04 | 2018-01-16 | 珠海格力电器股份有限公司 | Relay voltage reduction maintaining control circuit and control method |
-
2003
- 2003-06-13 CN CN 03247295 patent/CN2640094Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107591281A (en) * | 2017-09-04 | 2018-01-16 | 珠海格力电器股份有限公司 | Relay voltage reduction maintaining control circuit and control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11322926B2 (en) | Hybrid DC circuit breaker | |
| CN208433908U (en) | Voltage source converter module and inverter | |
| CN102800526B (en) | Electro-magnetic contactor and electro-magnetic contactor monitoring system | |
| CN2798109Y (en) | Automatic DC power tester | |
| CN2640094Y (en) | Three-phase operation box | |
| CN1118108A (en) | Circuit breaker | |
| CA2467679A1 (en) | Circuit arrangement for the reliable switching of electrical circuits | |
| CN201749170U (en) | Work state indicator for circuit breaker | |
| CN211266446U (en) | Circuit breaker protection device | |
| CN1728492A (en) | Protector for imbalance of three-phase voltage | |
| CN205610220U (en) | Little electric anti -reverse connection circuit of photovoltaic | |
| CN1278352C (en) | Three-phase operating box | |
| CN109994340B (en) | A repeat circuit and control method thereof | |
| CN103647497A (en) | Permanent magnet motor control circuit and permanent magnet motor | |
| CN217388230U (en) | Take intelligent PDU circuit of direct function | |
| CN109936352A (en) | All solid state dc circuit breaker and its control method based on IGBT | |
| CN2596641Y (en) | Silicon chain break circuit protector | |
| CN209962998U (en) | Air switch with remote control function | |
| CN203896243U (en) | Control loop for permanent magnet motor, and permanent magnet motor | |
| CN220368466U (en) | Start failure control loop | |
| CN208226542U (en) | A kind of low-voltage comprehensive-protection device with anti-bouncing function | |
| CN212304723U (en) | Anticreep circuit breaker | |
| CN2501180Y (en) | Multifunctional electromagnetic leakage circuit breaker | |
| CN208674031U (en) | A kind of trip-preventing circuit of breaker | |
| CN2152334Y (en) | Double loop motor protector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20030613 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |