CN201812008U - Detection circuit for relay protection device - Google Patents
Detection circuit for relay protection device Download PDFInfo
- Publication number
- CN201812008U CN201812008U CN2010205416006U CN201020541600U CN201812008U CN 201812008 U CN201812008 U CN 201812008U CN 2010205416006 U CN2010205416006 U CN 2010205416006U CN 201020541600 U CN201020541600 U CN 201020541600U CN 201812008 U CN201812008 U CN 201812008U
- Authority
- CN
- China
- Prior art keywords
- circuit
- constant
- current
- voltage
- divider resistance
- 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
Images
Landscapes
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The embodiment of the utility model discloses a detection circuit for a relay protection device, which is used for ensuring the normal operation of circuit elements in the detection circuit when detection voltage is increased. The detection circuit in the embodiment of the utility model comprises a constant-current circuit and an optical coupling isolation output circuit, wherein the detection voltage is input into the input end of the constant-current circuit; the input end of the optical coupling isolation output circuit is connected with the output end of the constant-current circuit; the constant-current circuit comprises a transient diode (D1) and a constant-current diode (D2) which are connected in series with each other; the transient diode (D1) is used for providing threshold voltage and sharing the input detection voltage; the constant-current diode (D2) is used for providing stable current for the detection circuit; and the optical coupling isolation output circuit is used for transmitting a low-voltage control signal. In addition, the detection circuit can be compatible with alternating current/direct current detection voltage through improvement.
Description
Technical field
The utility model relates to circuit field, relates in particular to a kind of protective relaying device testing circuit.
Background technology
In the electric power protection industry, the application of protective relaying device is very extensive, and indispensable.No matter be small enough to some electric devices (as generator, supply line), or, all need protective relaying device that the failure warning signal is provided, or directly control isolating switch automatically and send trip command, to guarantee the safety of power equipment greatly to whole electric system.
Because being widely used of protective relaying device, the range spans of its protection voltage is also very big, needs a testing circuit that the high-voltage signal in the holding circuit is converted to low-voltage control signal, to make things convenient for controlling of computing machine or some intelligent electronic devices.
In the prior art, the inner mode that adopts mu balanced circuit to add spacing output circuit of general testing circuit is a low-voltage control signal with the detection voltage transitions of high pressure; Wherein mu balanced circuit partly is to adopt voltage stabilizing diode to cooperate the mode of resistance, utilizes the characteristic of voltage stabilizing and current limliting to conduct high-voltage signal.
This kind circuit structure, increase when detecting voltage, when causing the voltage stabilizing diode reverse breakdown, because loop resistance is a fixed value in the circuit, if detecting voltage still continues to increase, the voltage of reverse breakdown will be carried in the loop resistance, thereby causes that electric current is also continuing to increase in the loop, can cause following problem thus:
One, spacing output circuit generally adopts optocoupler to isolate, and input has certain limitation and optocoupler diode end is generally for electric current, if electric current continues to increase, might burn photo-coupler;
Two, according to rating formula: P=I * U, if electric current continues to increase in the loop, and the reverse voltage in the loop is also increasing, the power consumption in the whole mu balanced circuit can sharply increase, and causes the element consume in the circuit too fast.
The utility model content
The utility model embodiment provides a kind of protective relaying device testing circuit, is used for guaranteeing the operate as normal of circuit component in the testing circuit when detecting the voltage increase.
A kind of protective relaying device testing circuit comprises: constant-current circuit and light-coupled isolation output circuit; The input end of described constant-current circuit inserts and detects voltage; The input end of described light-coupled isolation output circuit links to each other with the output terminal of constant-current circuit; Described constant-current circuit comprises: transient state diode (D1) and current regulator diode (D2), and described transient state diode (D1) is connected with constant current diode (D2); The detection voltage that described transient state diode (D1) is used to threshold voltage is provided and shares input, described current regulator diode (D2) is used to testing circuit that stable electric current is provided; Described light-coupled isolation output circuit is used to transmit low-voltage control signal.
As can be seen from the above technical solutions, the utility model embodiment has the following advantages: the utility model has adopted the transient state diode to add the front-end circuit of the constant-current circuit of current regulator diode composition as the light-coupled isolation output circuit, when detecting the voltage increase, because the transient state diode has been shared most detection voltage, so current regulator diode can be in specified operating voltage, make current in loop still keep constant, guaranteed the operate as normal of circuit component in the testing circuit.
Description of drawings
Fig. 1 is the logical organization synoptic diagram of protective relaying device testing circuit among the utility model embodiment;
Fig. 2 is the physical circuit synoptic diagram of protective relaying device testing circuit among the utility model embodiment;
Fig. 3 is another physical circuit synoptic diagram of protective relaying device testing circuit among the utility model embodiment.
Embodiment
The utility model embodiment provides a kind of protective relaying device testing circuit, is used for guaranteeing the operate as normal of circuit component in the testing circuit when detecting the voltage increase.
See also Fig. 1, testing circuit mainly comprises with the lower part among the utility model embodiment:
Constant-current circuit 101, the input end of constant-current circuit insert and detect voltage, and this detection voltage is opening into voltage of protective relaying device institute's holding circuit.
Constant-current circuit comprises: transient state diode (D1) and current regulator diode (D2), transient state diode (D1) is connected with constant current diode (D2).
The detection voltage that transient state diode (D1) is used to threshold voltage is provided and shares input; Current regulator diode (D2) is used to testing circuit that stable electric current is provided.After the maximum direct current or continuous working voltage of determining testing circuit, just can select the specification of using transient state diode (D1) according to the size of current regulator diode (D2) steady current again; The specification of current regulator diode (D2) is then selected according to the nominal operational parameters of each electronic component in the light-coupled isolation output circuit.
Light-coupled isolation output circuit 102, the input end of light-coupled isolation output circuit links to each other with the output terminal of constant-current circuit.The light-coupled isolation output circuit is used to transmit low-voltage control signal.In protective relaying device, before the transmission low-voltage control signal, in order to improve the reliability of device, need isolate, to avoid the interference of high-voltage signal to the input circuit of control signal.
Below the protective relaying device testing circuit embodiment among the utility model embodiment is described in detail, sees also Fig. 2, the protective relaying device testing circuit comprises among the utility model embodiment:
Constant-current circuit, this constant-current circuit comprises: transient state diode (D1), current regulator diode (D2), divider resistance (R6), protective resistance (R2).
The annexation of each electronic component is as follows in the constant-current circuit:
Transient state diode (D1), current regulator diode (D2) and divider resistance (R6) series connection, protective resistance (R2) is in parallel with the output terminal of constant-current circuit.
The light-coupled isolation output circuit, this light-coupled isolation output circuit comprises: photo-coupler (U2), divider resistance (R3) and (R5), triode (T1), operating voltage, signal output part.
The annexation of each electronic component is as follows in the light-coupled isolation output circuit:
The input end of photo-coupler (U2) links to each other with the output terminal of constant-current circuit, the grounded emitter of photo-coupler (U2) output terminal, the collector of photo-coupler (U2) output terminal is connected with divider resistance (R3), divider resistance (R3) links to each other with the base stage of triode (T1), the grounded collector of triode (T1), operating voltage links to each other with divider resistance (R5), divider resistance (R5) links to each other with the emitter of triode (T1), and the contact between the emitter of divider resistance (R5) and triode (T1) is connected signal output part.
When transient state diode (D1) and current regulator diode (D2) selected parameter not simultaneously, to detect magnitude of voltage also different in shielded input in the testing circuit, the selected parameter of concrete reference is as shown in table 1:
Table 1
| Detect voltage | Transient state diode specification | The current regulator diode specification |
| DC+24V | Threshold voltage 15V | Constant current 2mA |
| DC+110V | Threshold voltage 68V | Constant current 2mA |
| DC+220V | Threshold voltage 130V | Constant current 2mA |
When detecting the voltage arrival, the forward voltage of transient state diode (D1) is as the threshold voltage holding circuit and distinguish the control signal that detects voltage.
When detecting voltage less than threshold voltage, there is not electric current in the constant-current circuit, photo-coupler (U2) does not have conducting, the high level signal of signal output part output services voltage.
When detecting voltage greater than threshold voltage, transient state diode (D1) conducting, detect voltage and enter constant-current circuit, transient state diode (D1) and divider resistance (R6) have been born most detection voltage, make current regulator diode (D2) in rated voltage, work, when detection voltage changes, motional impedance in the current regulator diode (D2) is also along with variation, as long as the variable quantity that detects voltage does not surpass the operating voltage range in current regulator diode (D2) constant current district, then the electric current of whole constant-current circuit keeps constant.Because protective resistance (R2) is in parallel with the output terminal of constant-current circuit,, also can protect the constant-current circuit output terminal to connect the light-coupled isolation output circuit even the detection voltage input of high pressure low energy is arranged.When the constant-current circuit conducting, constant current signal makes photo-coupler (U2) conducting, and the high-voltage signal that detects voltage is converted to the control signal of low pressure; Since the conversion after low-voltage control signal strength of current a little less than, so need to amplify control signal by triode (T1), the drive current of enhancing signal output terminal, makes signal output part export the low level signal of ground connection apace at the reflection time of improving signal output part.
The utility model has adopted the transient state diode to add the front-end circuit of the constant-current circuit of current regulator diode composition as the light-coupled isolation output circuit, when detecting the voltage increase, because the transient state diode has been shared most detection voltage, so current regulator diode can be in specified operating voltage, make current in loop still keep constant, guaranteed the operate as normal of circuit component in the testing circuit.
In addition, because the current constant in the constant-current circuit is when the detection voltage of input increases, according to rating formula: P=I * U, the amplification of the utility model testing circuit power consumption can be little a lot of when using voltage stabilizing diode in the prior art, prolonged the serviceable life of electronic component in the circuit.
If testing circuit of the present utility model adds rectifier bridge at the input end that detects voltage, then compatible input direct current and the detection voltage that exchanges see also Fig. 3, and another embodiment of protective relaying device testing circuit comprises among the utility model embodiment:
Constant-current circuit, this constant-current circuit comprises: transient state diode (D1), current regulator diode (D2), divider resistance (R6) and (R1), protective resistance (R2), rectifier bridge (U1), filter capacitor (C1).
The annexation of each electronic component is as follows in the constant-current circuit:
Transient state diode (D1) links to each other with the two ends of detection voltage input end in the constant-current circuit respectively with divider resistance (R1); First ac input end of rectifier bridge (U1) links to each other with transient state diode (D1), second ac input end links to each other with divider resistance (R1), the negative pole dc output end of rectifier bridge (U1) links to each other with the negative input of current regulator diode (D2), and the anodal utmost point dc output end of rectifier bridge (U1) is in parallel with protective resistance (R2); The series connection of current regulator diode (D2) and divider resistance (R6), protective resistance (R2), filter capacitor (C1) are in parallel with the output terminal of constant-current circuit.
The light-coupled isolation output circuit, this light-coupled isolation output circuit comprises: photo-coupler (U2), divider resistance (R3), (R4) and (R5), building-out capacitor (C2), triode (T1), operating voltage, signal output part.
The annexation of each electronic component is as follows in the light-coupled isolation output circuit:
The input end of photo-coupler (U2) links to each other with the output terminal of constant-current circuit, the grounded emitter of photo-coupler (U2) output terminal, the collector of photo-coupler (U2) output terminal is connected with divider resistance (R3), divider resistance (R3) links to each other with the base stage of triode (T1), the grounded collector of triode (T1), operating voltage links to each other with divider resistance (R5), divider resistance (R4) is in parallel with divider resistance (R5), building-out capacitor (C2) is connected with divider resistance (R4), and the other end ground connection of building-out capacitor (C2), divider resistance (R5) links to each other with the emitter of triode (T1), and the contact between the emitter of divider resistance (R5) and triode (T1) is connected signal output part.
Because the restriction of the formed threshold voltage of transient state diode (D1), when selecting rectifier bridge (U1) for use, do not need to adopt the rectifier bridge of high pressure, generally adopt the rectifier bridge of 5 to 20 volts of ratings to get final product, avoided the excessive bigger defective of entire circuit plate area that causes of circuit component.
The scope of the detection voltage that testing circuit of the present utility model is protected can be adjusted by changing transient state diode (D1) and divider resistance (R1) according to the practical application needs.
The utility model has added rectifier bridge on the basis of above-mentioned testing circuit, the compatible detection voltage input of AC and DC has enlarged the usable range of the utility model testing circuit.
For the ease of understanding, with a concrete application scenarios protective relaying device testing circuit of describing in the above embodiments is described in detail below, see also Fig. 3, be specially:
When the detection voltage of input is alternating voltage, if surpass the formed threshold voltage of transient state diode (D1), whole testing circuit is work not, and signal output part is a high level; The input cable that detects voltage in actual applications may be long, some in addition reach rice up to a hundred, simultaneously, owing to hold into cable and can be in a cable duct together with the All other routes cable, thereby might import the instantaneous interference voltage that can produce tens volts between cable even go up hectovolt.Because this instantaneous interference voltage is not need to trigger protective relaying device; so another function of transient state diode (D1) is: intercept this instantaneous interference voltage with the form of threshold voltage at the input end that detects voltage; avoid the signal output part of light-coupled isolation output circuit to produce malfunction, cause protective relaying device to trigger isolating switch and produce maloperation.
When the interference source that has macro-energy disturbs, cause the detection voltage of input end to raise, supposed to surpass the threshold voltage of transient state diode (D1), then transient state diode (D1) conducting, constant-current circuit is started working.Ac signal is converted to dc signal by rectifier bridge (U1), in order to increase stability, can add the patch capacitor (not expressing) of 10V, a 0.1uF in Fig. 3 at each diode end of rectifier bridge (U1) in actual applications.Since constant-current circuit input end connect is AC signal, if having high-frequency signal in this detections voltage, then may burn out the light-coupled isolation output circuit of back level, so at the output terminal of constant-current circuit filter capacitor (C1) in parallel, with the filtration high-frequency signal.
When constant-current circuit is started working, constant current signal makes photo-coupler (U2) conducting, and the high-voltage signal that detects voltage is converted to the control signal of low pressure.Since constant-current circuit input end connect is the existence of AC signal and the formed threshold voltage of transient state diode (D1), signal output part is the state of output low level always not, thereby adopt building-out capacitor (C2) to carry out low-voltage compensation, make signal output part in the AC signal conducting, be in low level state always.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be a ROM (read-only memory), disk or CD etc.
More than a kind of protective relaying device testing circuit provided by the utility model is described in detail; for one of ordinary skill in the art; thought according to the utility model embodiment; part in specific embodiments and applications all can change; in sum, this description should not be construed as restriction of the present utility model.
Claims (6)
1. a protective relaying device testing circuit is characterized in that, comprising:
Constant-current circuit and light-coupled isolation output circuit;
The input end of described constant-current circuit inserts and detects voltage;
The input end of described light-coupled isolation output circuit links to each other with the output terminal of constant-current circuit;
Described constant-current circuit comprises: transient state diode (D1) and current regulator diode (D2), and described transient state diode (D1) is connected with constant current diode (D2); The detection voltage that described transient state diode (D1) is used to threshold voltage is provided and shares input, described current regulator diode (D2) is used to testing circuit that stable electric current is provided;
Described light-coupled isolation output circuit is used to transmit low-voltage control signal.
2. testing circuit according to claim 1 is characterized in that, described constant-current circuit also comprises:
Divider resistance (R6) and protective resistance (R2);
Described divider resistance (R6) is connected with described current regulator diode (D2);
Described protective resistance (R2) is in parallel with the output terminal of constant-current circuit.
3. testing circuit according to claim 1 and 2 is characterized in that, described constant-current circuit also comprises:
Divider resistance (R1) and rectifier bridge (U1);
Described divider resistance (R1) links to each other with the input end of detection voltage in the constant-current circuit;
First ac input end of described rectifier bridge (U1) links to each other with transient state diode (D1), second ac input end links to each other with divider resistance (R1), the negative pole dc output end of rectifier bridge (U1) links to each other with the negative input of current regulator diode (D2), and the anodal dc output end of rectifier bridge (U1) is in parallel with protective resistance (R2);
Described rectifier bridge (U1) is used to make the detection voltage of the compatible AC and DC of constant-current circuit to import.
4. testing circuit according to claim 3 is characterized in that, described constant-current circuit also comprises:
Filter capacitor (C1);
Described filter capacitor (C1) is in parallel with protective resistance (R2), and described filter capacitor (C1) is used for filtering the high-frequency signal that detects voltage.
5. testing circuit according to claim 1 is characterized in that, described light-coupled isolation output circuit comprises:
Photo-coupler (U2), divider resistance (R3) and (R5), triode (T1), operating voltage and signal output part;
The input end of described photo-coupler (U2) links to each other with the output terminal of constant-current circuit, the grounded emitter of photo-coupler (U2) output terminal, the collector of photo-coupler (U2) output terminal is connected with divider resistance (R3), divider resistance (R3) links to each other with the base stage of triode (T1), the grounded collector of triode (T1), operating voltage links to each other with divider resistance (R5), divider resistance (R5) links to each other with the emitter of triode (T1), and the contact between the emitter of divider resistance (R5) and triode (T1) is connected signal output part.
6. testing circuit according to claim 5 is characterized in that, described light-coupled isolation output circuit also comprises:
Divider resistance (R4) and building-out capacitor (C2);
Described divider resistance (R4) is in parallel with divider resistance (R5);
Described building-out capacitor (C2) is connected with divider resistance (R4), and the other end ground connection of building-out capacitor (C2); Described building-out capacitor (C2) is used for when exchanging the input of detection voltage, and the voltage of compensating signal output terminal makes signal output part to be in low level state when exchanging the detectable voltage signals conducting always.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205416006U CN201812008U (en) | 2010-09-21 | 2010-09-21 | Detection circuit for relay protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205416006U CN201812008U (en) | 2010-09-21 | 2010-09-21 | Detection circuit for relay protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201812008U true CN201812008U (en) | 2011-04-27 |
Family
ID=43894949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205416006U Expired - Lifetime CN201812008U (en) | 2010-09-21 | 2010-09-21 | Detection circuit for relay protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201812008U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957413A (en) * | 2010-09-21 | 2011-01-26 | 深圳市华力特电气股份有限公司 | Relay protection device detection circuit |
| CN105866591A (en) * | 2016-05-17 | 2016-08-17 | 上海紫通信息科技有限公司 | Power equipment output signal acquisition circuit |
| CN110505741A (en) * | 2019-09-20 | 2019-11-26 | 江苏海湾电气科技有限公司 | A kind of method and device detecting naval light state |
| CN112467996A (en) * | 2019-09-06 | 2021-03-09 | 群光电能科技股份有限公司 | High-low pressure compensation device |
| CN113922655A (en) * | 2021-10-18 | 2022-01-11 | 无锡市欧瑞杰电子科技有限公司 | PWM chip starts and loses electric warning circuit and switching power supply |
-
2010
- 2010-09-21 CN CN2010205416006U patent/CN201812008U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957413A (en) * | 2010-09-21 | 2011-01-26 | 深圳市华力特电气股份有限公司 | Relay protection device detection circuit |
| CN101957413B (en) * | 2010-09-21 | 2013-01-16 | 深圳市华力特电气股份有限公司 | Relay protection device detection circuit |
| CN105866591A (en) * | 2016-05-17 | 2016-08-17 | 上海紫通信息科技有限公司 | Power equipment output signal acquisition circuit |
| CN112467996A (en) * | 2019-09-06 | 2021-03-09 | 群光电能科技股份有限公司 | High-low pressure compensation device |
| CN110505741A (en) * | 2019-09-20 | 2019-11-26 | 江苏海湾电气科技有限公司 | A kind of method and device detecting naval light state |
| CN113922655A (en) * | 2021-10-18 | 2022-01-11 | 无锡市欧瑞杰电子科技有限公司 | PWM chip starts and loses electric warning circuit and switching power supply |
| CN113922655B (en) * | 2021-10-18 | 2024-02-20 | 无锡市欧瑞杰电子科技有限公司 | PWM chip starting and power-off alarm circuit and switching power supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101957413B (en) | Relay protection device detection circuit | |
| CN202217019U (en) | Three-phase supply input open phase detection circuit | |
| CN101882879B (en) | Circuit converting constant current source to constant voltage source and light using same | |
| CN205070777U (en) | Switching power supply circuit | |
| CN201812008U (en) | Detection circuit for relay protection device | |
| CN103166175B (en) | LED drive power protection circuit against input over-voltage | |
| CN102426302A (en) | Three-phase power input open-phase detection circuit | |
| CN202854225U (en) | Sinusoidal alternating current voltage zero cross detection circuit | |
| CN101614795B (en) | Default-phase signal detection circuit for three-phase power | |
| CN203457063U (en) | High-frequency switching power supply output rectifier circuit | |
| CN202994892U (en) | Power supply failure detection unit | |
| CN204578083U (en) | To ask for power type lightning arrester supervisory control system | |
| CN102857105A (en) | Switch power source circuit and corresponding switch power source device | |
| CN200987066Y (en) | Household line protector | |
| CN102998620B (en) | Device and method for quick online fault detection of high voltage thyristor valve block | |
| CN104411035A (en) | LED drive circuit without auxiliary winding for power supply | |
| CN103427428A (en) | Quick three-phase reactive compensation switch | |
| CN215728409U (en) | Wide voltage input signal monitoring circuit with isolation filtering function | |
| CN105471086A (en) | Redundant power system and current adjustment method | |
| CN207557357U (en) | A kind of three-phase input power phase shortage detection circuit | |
| CN215772524U (en) | Charger mains voltage abnormity protection circuit | |
| CN203205828U (en) | LED driving power supply input overvoltage protection circuit | |
| CN209627047U (en) | Ups power | |
| CN208874354U (en) | Low view based on double switch power power supply electric energy meter carries power control circuit | |
| CN102866278A (en) | Output voltage detecting circuit for frequency changer and frequency changer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110427 Effective date of abandoning: 20130227 |
|
| RGAV | Abandon patent right to avoid regrant |