CN203151068U - Three-phase protection relay - Google Patents
Three-phase protection relay Download PDFInfo
- Publication number
- CN203151068U CN203151068U CN 201220386238 CN201220386238U CN203151068U CN 203151068 U CN203151068 U CN 203151068U CN 201220386238 CN201220386238 CN 201220386238 CN 201220386238 U CN201220386238 U CN 201220386238U CN 203151068 U CN203151068 U CN 203151068U
- Authority
- CN
- China
- Prior art keywords
- phase
- circuit
- power
- current supply
- relay
- 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 - Fee Related
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a three-phase protection relay. The three-phase protection relay comprises a switching circuit, an MCU microprocessor, a relay output circuit, a power circuit, an output indicating circuit and a parameter setting circuit. The MCU microprocessor is used to preprocess a voltage and a phase position of a three-phase alternating power supply which are acquired by a system, results that are obtained are compared with an over-undervoltage tripping threshold and a power recovery threshold which are stored in the MCU microprocessor, a coil in the relay output circuit is controlled, and in prescribed tripping relay time and power recovery time, a contact connected in series between the three-phase alternating current power supply and three-phase electric equipment is disconnected or connected, and thus achieving the purposes of protecting and recovering power supply of the electric equipment as soon as possible.
Description
Technical field
The utility model relates to a kind of three-phase protective relay.
Background technology
In low-voltage electrical apparatus; generally realize monitoring and the protection of three-phase alternating-current supply by overvoltage/undervoltage relay, phase sequence relay; served as under-voltage relay or phase sequence relay monitor out three-phase alternating-current supply reach the overvoltage/undervoltage threshold value time; its coil gets; make the contact disjunction that is connected between three-phase alternating-current supply and three-phase power consumption equipment, to reach the purpose of protection.The shortcoming of existing overvoltage/undervoltage relay and phase sequence relay is: one, adopt the electromagnetic type structure, the protection precision is low; Two, function is disperseed, and the three-phase alternating-current supply fault type is numerous, if will realize the omnibearing protection of three-phase alternating-current supply, needs a plurality of various types of relays of set to realize protection, causes great inconvenience for debugging and the use of three-phase power consumption equipment; Three, the relay contact action type is single, usually, the relay contact action type of domestic product is the fault-free security type, when the equipment operation troubles occurring, the coil losing electricity of relay causes security incident easily or does not satisfy the concrete condition of the technology of equipment operation.
Summary of the invention
The purpose of this utility model is to overcome the defective of prior art, and it is the three-phase protective relay of failure safe type that a kind of contact action type of gathering kinds of protect function, protection precision height and output relay is provided.
For achieving the above object, the utility model adopts a kind of like this three-phase protective relay, comprises
Change-over circuit, described change-over circuit is connected to the A/D port of MCU microprocessor, being used for gathering voltage, the phase signal of three-phase alternating-current supply and converting thereof into can be for the signal of back level unit identification, and described three-phase alternating-current supply is used to the power supply of three-phase power consumption equipment;
The MCU microprocessor, gather voltage, the phase signal of described three-phase alternating-current supply, and according to the overvoltage/undervoltage dropout threshold value of setting, in official hour, the control relay output circuit makes auto-closing and the disjunction of the connection line of three-phase alternating-current supply and described three-phase power consumption equipment;
The relay output circuit is connected to the output port of described MCU microprocessor, can be set to failure safe type contact and fault-free safety-type contact according to the contact of system requirements relay;
Power circuit takes out the 220V alternating current from described three-phase alternating-current supply, through the three-terminal voltage-stabilizing pipe, is described MCU microprocessor system and the power supply of described relay output circuit;
Export indicating circuit, be used to indicate the state of the current voltage of described three-phase alternating-current supply;
Parameter setting circuit is connected to the input port of the little processing of described MCU, is used for the time and the threshold value that overvoltage/undervoltage dropout threshold value are set, thread off time of delay and power up.
Especially; described three-phase protective relay comprises the broken neutral line identification circuit; described broken neutral line identification circuit comprises optocoupler U1; a two-phase of described three-phase alternating-current supply is respectively through resistance R 1; R2 and R3; R4 is connected to the anode of the input stage of described optocoupler U1; the neutral line of described three-phase alternating-current supply is connected to the negative terminal of the input stage of described optocoupler U1; anti-and meet diode D1 between the positive and negative terminal of the input stage of described optocoupler U1; the current collection end of the output stage of described optocoupler U1 is connected to the output positive voltage+5V of described power circuit through pull-up resistor R5; the current collection end of the output stage of described optocoupler U1 also is connected to the input port of described MCU microprocessor through resistance R 6, the transmitting terminal of the output stage of described optocoupler U1 is connected to the ground of described power circuit.
Especially, described three-phase protective relay comprises the power-supply system identification circuit, and described power-supply system identification circuit is connected to the input port of described MCU microprocessor, is used for the affiliated electric power system of the current described three-phase alternating-current supply of identification.
Compared with the prior art, the beneficial effects of the utility model are embodied in:
1, adopt the MCU microprocessor to system acquisition to voltage and the phase place of three-phase alternating-current supply carry out preliminary treatment; the gained result compares with the overvoltage/undervoltage dropout threshold value and the power up threshold value that are kept in the MCU microprocessor; and the coil in the control relay output circuit; dropout time of delay and power up in the time in regulation; make the contact disjunction or the closure that are connected between three-phase alternating-current supply and three-phase power consumption equipment, to reach protection and to recover the purpose of power consumption equipment power supply as early as possible.
2, import the residing power supply type of current system by the broken neutral line identification circuit, the power supply type that makes the MCU microprocessor can distinguish three-phase alternating-current supply is three-phase three-wire system or three-phase four-wire system, makes corresponding computing and protection,
In sum, the utlity model has defencive function and concentrate, protect precision height, the reliable characteristics of contact handling safety.
Description of drawings
Fig. 1 is the principle block diagram of the utility model embodiment one three-phase protective relay;
Fig. 2 is the schematic diagram of broken neutral line identification circuit in the utility model embodiment two three-phase protective relays.
Embodiment
Shown in Fig. 1～2, a kind of three-phase protective relay comprises
Change-over circuit, change-over circuit are connected to the A/D port of MCU microprocessor, and being used for gathering voltage, the phase signal of three-phase alternating-current supply and converting thereof into can be for the signal of back level unit identification, and three-phase alternating-current supply is used to the power supply of three-phase power consumption equipment;
The MCU microprocessor, gather voltage, the phase signal of three-phase alternating-current supply, and according to the overvoltage/undervoltage dropout threshold value of setting, in official hour, the control relay output circuit makes auto-closing and the disjunction of the connection line of three-phase alternating-current supply and three-phase power consumption equipment;
The relay output circuit is connected to the output port of MCU microprocessor, can be set to failure safe type contact and fault-free safety-type contact according to the contact of system requirements relay;
Power circuit takes out the 220V alternating current from three-phase alternating-current supply, through the three-terminal voltage-stabilizing pipe, is MCU microprocessor system and the power supply of relay output circuit;
Export indicating circuit, be used to indicate the state of the current voltage of three-phase alternating-current supply;
Parameter setting circuit is connected to the input port of the little processing of MCU, is used for the time and the threshold value that overvoltage/undervoltage dropout threshold value are set, thread off time of delay and power up.
The three-phase protective relay comprises the broken neutral line identification circuit; the broken neutral line identification circuit comprises optocoupler U1; a two-phase of three-phase alternating-current supply is respectively through resistance R 1; R2 and R3; R4 is connected to the anode of the input stage of optocoupler U1; the neutral line of three-phase alternating-current supply is connected to the negative terminal of the input stage of optocoupler U1; anti-and meet diode D1 between the positive and negative terminal of the input stage of optocoupler U1; the current collection end of the output stage of optocoupler U1 is connected to the output positive voltage+5V of power circuit through pull-up resistor R5; the current collection end of the output stage of optocoupler U1 also is connected to the input port of MCU microprocessor through resistance R 6, the transmitting terminal of the output stage of optocoupler U1 is connected to the ground of power circuit.
The three-phase protective relay comprises the power-supply system identification circuit, and the power-supply system identification circuit is connected to the input port of MCU microprocessor, is used for the affiliated electric power system of the current three-phase alternating-current supply of identification.
Claims (3)
1. a three-phase protective relay is characterized in that: comprise
Change-over circuit, described change-over circuit is connected to the A/D port of MCU microprocessor, being used for gathering voltage, the phase signal of three-phase alternating-current supply and converting thereof into can be for the signal of back level unit identification, and described three-phase alternating-current supply is used to the power supply of three-phase power consumption equipment;
The MCU microprocessor, gather voltage, the phase signal of described three-phase alternating-current supply, and according to the overvoltage/undervoltage dropout threshold value of setting, in official hour, the control relay output circuit makes auto-closing and the disjunction of the connection line of three-phase alternating-current supply and described three-phase power consumption equipment;
The relay output circuit is connected to the output port of described MCU microprocessor, can be set to failure safe type contact and fault-free safety-type contact according to the contact of system requirements relay;
Power circuit takes out the 220V alternating current from described three-phase alternating-current supply, through the three-terminal voltage-stabilizing pipe, is described MCU microprocessor system and the power supply of described relay output circuit;
The output indicating circuit is used to indicate the current voltage of described three-phase alternating-current supply, the state of phase place;
Parameter setting circuit is connected to the input port of the little processing of described MCU, is used for the time and the threshold value that overvoltage/undervoltage dropout threshold value are set, thread off time of delay and power up.
2. three-phase protective relay according to claim 1; it is characterized in that: described three-phase protective relay comprises the broken neutral line identification circuit; described broken neutral line identification circuit comprises optocoupler U1; a two-phase of described three-phase alternating-current supply is respectively through resistance R 1; R2 and R3; R4 is connected to the anode of the input stage of described optocoupler U1; the neutral line of described three-phase alternating-current supply is connected to the negative terminal of the input stage of described optocoupler U1; anti-and meet diode D1 between the positive and negative terminal of the input stage of described optocoupler U1; the current collection end of the output stage of described optocoupler U1 is connected to the output positive voltage+5V of described power circuit through pull-up resistor R5; the current collection end of the output stage of described optocoupler U1 also is connected to the input port of described MCU microprocessor through resistance R 6, the transmitting terminal of the output stage of described optocoupler U1 is connected to the ground of described power circuit.
3. three-phase protective relay according to claim 1 and 2; it is characterized in that: described three-phase protective relay comprises the power-supply system identification circuit; described power-supply system identification circuit is connected to the input port of described MCU microprocessor, is used for the affiliated electric power system of the current described three-phase alternating-current supply of identification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220386238 CN203151068U (en) | 2012-08-03 | 2012-08-03 | Three-phase protection relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220386238 CN203151068U (en) | 2012-08-03 | 2012-08-03 | Three-phase protection relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203151068U true CN203151068U (en) | 2013-08-21 |
Family
ID=48978564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220386238 Expired - Fee Related CN203151068U (en) | 2012-08-03 | 2012-08-03 | Three-phase protection relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203151068U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896462A (en) * | 2016-04-18 | 2016-08-24 | 国网山东省电力公司郓城县供电公司 | Intelligent device for achieving neutral wire breaking protection of three-phase four-wire system power supply system |
-
2012
- 2012-08-03 CN CN 201220386238 patent/CN203151068U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896462A (en) * | 2016-04-18 | 2016-08-24 | 国网山东省电力公司郓城县供电公司 | Intelligent device for achieving neutral wire breaking protection of three-phase four-wire system power supply system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203466383U (en) | Intelligent static safe energy-saving multifunctional socket with zero power consumption | |
| CN201590645U (en) | AC input over-voltage and under-voltage protection device for electric apparatus | |
| CN204205552U (en) | The under-voltage over-voltage detection circuit of a kind of AC | |
| CN103066559B (en) | Power-off protector | |
| CN202275129U (en) | On/off detection circuit for relay of smart electricity meter | |
| CN204068246U (en) | A kind of low pressure drop low-power dissipation power supply protective circuit | |
| CN203589679U (en) | Vehicle-mounted single-phase AC power supply intelligent monitoring unit | |
| CN102487188A (en) | Resettable overvoltage and under-voltage protection switch | |
| CN101447660B (en) | Automatic reclosing controller of general low-voltage circuit breaker | |
| CN203522122U (en) | Load line fault detection circuit applied to circuit breaker reclosing | |
| CN204967236U (en) | Leakage protector | |
| CN103487707B (en) | Vehicle-mounted three-phase alternating-current powered intelligent monitoring unit | |
| CN103308755B (en) | The insulation detection device of high voltage direct current remote electric power system and method | |
| CN101447661B (en) | Control method for automatic reclosing controller | |
| CN203151068U (en) | Three-phase protection relay | |
| CN202424109U (en) | Electric protection module | |
| CN205231713U (en) | Novel low -tension motor protection and electric -dazzling prevention device | |
| CN203243019U (en) | Power-off protector | |
| CN203056555U (en) | Over-current protector | |
| CN205304217U (en) | Cross undervoltage protection ware | |
| CN204441633U (en) | Possesses the protection plug of power-off tripping operation and superpressure trip avoidance function | |
| CN204216568U (en) | A kind of motor protecter | |
| CN203117308U (en) | High-power electrical appliance arc fault detection system | |
| CN203276459U (en) | Electrical fire monitoring detector having overvoltage under-voltage detecting and protective functions | |
| CN204144901U (en) | A kind of automatic reclosing power protector with anti-stealing electricity function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130821 Termination date: 20150803 |
|
| EXPY | Termination of patent right or utility model |