CN204666760U - Residual current transformer failure detector circuit - Google Patents

Residual current transformer failure detector circuit Download PDF

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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
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China
Prior art keywords
residual current
current transformer
processing unit
signal processing
triode
Prior art date
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CN201520350771.3U
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Chinese (zh)
Inventor
孙峻岭
韩振飞
艾红斌
石险峰
何会杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
YI'AI FIRE-FIGHTING ELECTRONICS Co Ltd BENGBU
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YI'AI FIRE-FIGHTING ELECTRONICS Co Ltd BENGBU
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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

Residual current transformer failure detector circuit
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.
CN201520350771.3U 2015-05-26 2015-05-26 Residual current transformer failure detector circuit Active CN204666760U (en)

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

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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

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CN (1) CN204666760U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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

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