CN204666760U - Residual current transformer failure detector circuit - Google Patents
Residual current transformer failure detector circuit Download PDFInfo
- Publication number
- CN204666760U CN204666760U CN201520350771.3U CN201520350771U CN204666760U CN 204666760 U CN204666760 U CN 204666760U CN 201520350771 U CN201520350771 U CN 201520350771U CN 204666760 U CN204666760 U CN 204666760U
- Authority
- CN
- China
- Prior art keywords
- residual current
- current transformer
- processing unit
- signal processing
- triode
- 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.)
- Active
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a kind of residual current transformer failure detector circuit, comprise signal processing unit, the signals collecting end positive and negative electrode of signal processing unit is connected with residual current transformer respectively by connecting line, also comprise fault detect control circuit, fault detect control circuit is connected with signal processing unit control end, and the connecting line that fault detect control circuit is also rectified between pole, residual current transformer by wire and signal processing unit signals collecting is connected.Whether the utility model connecting line had between detection signal processing unit and external residual current transformer occurs to break or the function of short trouble, and circuit is simple, with low cost, reliable and stable.
Description
Technical field
The utility model relates to residual current transformer circuit field, specifically a kind of residual current transformer failure detector circuit.
Background technology
In new nation standard GB14287.2-2014 " residual current type detector for electric fire protection ", residual current type detector for electric fire protection is defined as and is made up of residual current sensor and signal processing unit.The residual current sensor generally used at present is residual current transformer, and is connected by external connection line with signal processing unit.
Compared with GB14287.2-2005, GB14287.2-2014 adds technical requirement: when the connecting line generation open circuit between signal processing unit and external residual current transformer or short circuit, residual current type detector for electric fire protection should be able to detect line fault.
Fig. 1 is the theory diagram of the residual current type detector for electric fire protection of prior art.The subject matter that prior art exists: residual current type detector for electric fire protection does not have the function detecting connecting line open circuit or short circuit between external residual current transformer and signal processing unit, does not namely have external residual current transformer fault detection capability.
utility model contentthe purpose of this utility model is to provide a kind of residual current transformer failure detector circuit, to solve prior art Problems existing.
In order to achieve the above object, the technical scheme that the utility model adopts is:
Residual current transformer failure detector circuit, comprise signal processing unit, the signals collecting of signal processing unit is rectified, negative pole is connected with external residual current transformer respectively by connecting line, it is characterized in that: also comprise fault detect control circuit, described fault detect control circuit comprises triode V1, the base stage of triode V1 accesses signal processing unit by resistance R1, resistance R2 is connected with between triode V1 base stage and emitter, the emitter of triode V1 also connects power supply, the collector of triode V1 is connected to the anode of a diode V2, the negative electrode of diode V2 rectifies pole by resistance R3 and signal processing unit signals collecting, connecting line between external residual current transformer connects.
Described residual current transformer failure detector circuit, is characterized in that: the emitter of described diode V2 connects 5V voltage source.
The beneficial effects of the utility model:
Whether the utility model connecting line had between detection signal processing unit and external residual current transformer there is the function of open circuit or short trouble, and circuit is simple, with low cost, reliable and stable.
Accompanying drawing explanation
Fig. 1 is the theory diagram of existing residual current type detector for electric fire protection.
Fig. 2 is the theory diagram of the utility model residual current transformer fault detect.
Fig. 3 is the circuit theory diagrams of the utility model residual current transformer fault detect.
Embodiment
As Fig. 2, shown in Fig. 3, residual current transformer failure detector circuit, comprise signal processing unit, the signals collecting of signal processing unit is rectified, negative pole is connected with residual current transformer respectively by connecting line, also comprise fault detect control circuit, fault detect control circuit comprises triode V1, the base stage of triode V1 accesses signal processing unit by resistance R1, resistance R2 is connected with between triode V1 base stage and emitter, the emitter of triode V1 also connects power supply, the collector of triode V1 is connected to the anode of a diode V2, the negative electrode of diode V2 rectifies pole by resistance R3 and signal processing unit signals collecting, connecting line between residual current transformer connects.The emitter of diode V2 connects 5V voltage source.
Fault detect control circuit is made up of resistance R1, resistance R2, triode V1, diode V2, resistance R3, resistance R1 is connected with the base electrode of resistance R2, triode V1, the collector of triode V1 is connected with the positive pole of diode V2, and the negative pole of diode V2 is connected with resistance R3.
When signal processing unit control fault detect control circuit is in conducting state, the control end output low level of signal processing unit, triode V1 conducting in causing trouble detection control circuit, then 5V voltage source is by triode V1, diode V2, the resistance R3 in fault detect control circuit, and certain voltage is produced on the connecting line at external residual current transformer two ends, signal processing unit is by the voltage at the external residual current transformer two ends of signals collecting port processing.When connecting line between signal processing unit with residual current transformer is normally connected, signal processing unit collects a kind of magnitude of voltage; During connecting line generation open circuit fault between signal processing unit and external residual current transformer, signal processing unit collects maximum voltage value; Connecting line between signal processing unit and external residual current transformer be short-circuited fault time, the magnitude of voltage that signal processing unit collects is 0V.By above-mentioned three kinds of magnitudes of voltage, signal processing unit judges whether the connecting line between the signal processing unit of residual current type detector for electric fire protection and external residual current transformer occurs to break or short trouble.
Signal processing unit control fault detect control circuit be in off state time, signal processing unit does not gather the voltage signal at described external residual current transformer two ends.
Claims (2)
1. residual current transformer failure detector circuit, comprise signal processing unit, the signals collecting of signal processing unit is rectified, negative pole is connected with residual current transformer respectively by connecting line, it is characterized in that: also comprise fault detect control circuit, described fault detect control circuit comprises triode V1, the base stage of triode V1 accesses signal processing unit by resistance R1, resistance R2 is connected with between triode V1 base stage and emitter, the emitter of triode V1 also connects power supply, the collector of triode V1 is connected to the anode of a diode V2, the negative electrode of diode V2 rectifies pole by resistance R3 and signal processing unit signals collecting, connecting line between residual current transformer connects.
2. residual current transformer failure detector circuit according to claim 1, is characterized in that: the emitter of described diode V2 connects 5V voltage source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520350771.3U CN204666760U (en) | 2015-05-26 | 2015-05-26 | Residual current transformer failure detector circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520350771.3U CN204666760U (en) | 2015-05-26 | 2015-05-26 | Residual current transformer failure detector circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204666760U true CN204666760U (en) | 2015-09-23 |
Family
ID=54137130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520350771.3U Active CN204666760U (en) | 2015-05-26 | 2015-05-26 | Residual current transformer failure detector circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204666760U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445537A (en) * | 2015-12-29 | 2016-03-30 | 威特龙消防安全集团股份公司 | Instrument transformer detection device and method |
| CN106019062A (en) * | 2016-07-29 | 2016-10-12 | 江苏益邦电力科技有限公司 | Residual current coil disconnection detection device and detection method thereof |
-
2015
- 2015-05-26 CN CN201520350771.3U patent/CN204666760U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445537A (en) * | 2015-12-29 | 2016-03-30 | 威特龙消防安全集团股份公司 | Instrument transformer detection device and method |
| CN106019062A (en) * | 2016-07-29 | 2016-10-12 | 江苏益邦电力科技有限公司 | Residual current coil disconnection detection device and detection method thereof |
| CN106019062B (en) * | 2016-07-29 | 2018-11-23 | 江苏益邦电力科技有限公司 | A kind of residual current coil breakage detection device and its detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204287446U (en) | A kind of power-fail detection circuit | |
| CN204631181U (en) | The testing circuit of a kind of rechargeable battery positive and negative electrode reversal connection | |
| CN103607016B (en) | Non-polarity automatic judgment charging circuit and charger | |
| CN204391679U (en) | A kind of leakage current detection protection circuit | |
| CN204666760U (en) | Residual current transformer failure detector circuit | |
| CN203519761U (en) | Anti-error-connection detecting circuit for zero line and live line of AC power | |
| CN202548267U (en) | Circuit for detecting live wire and zero wire | |
| CN208508514U (en) | A kind of short-circuit protection circuit of switching circuit | |
| CN203339676U (en) | Reverse-connection and short-circuit protection circuit for batteries | |
| CN204720956U (en) | A kind of three-phase uninterrupted power supply with lack detection circuit | |
| CN203551744U (en) | Electric energy meter load switch state detection circuit | |
| CN205015391U (en) | Medical stand -by power supply voltage detecting early warning circuit | |
| CN211086562U (en) | Commercial power ground wire connectivity detection circuit and device | |
| CN201479113U (en) | Trigger interface circuit irrespective of polarity | |
| CN204719122U (en) | A kind of voltage detecting warning circuit | |
| CN203365525U (en) | Power grid voltage detection device | |
| CN202712884U (en) | Battery connection detecting circuit and battery charger | |
| CN203455400U (en) | Current detection circuit | |
| CN103389401B (en) | A kind of electric network voltage detection device | |
| CN203130575U (en) | Alternating-current fan fault detecting circuit | |
| CN203324355U (en) | Microwave-system diverse self-checking circuit | |
| CN203535153U (en) | PE detection device | |
| CN205049720U (en) | General type detection circuitry of alternating current -direct current lamps and lanterns | |
| CN206281930U (en) | A kind of three phase electric machine break detection circuit | |
| CN205038011U (en) | Water leakage detecting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |