CN2062124U - Countertime limiting overcurrent relay - Google Patents
Countertime limiting overcurrent relay Download PDFInfo
- Publication number
- CN2062124U CN2062124U CN 90211518 CN90211518U CN2062124U CN 2062124 U CN2062124 U CN 2062124U CN 90211518 CN90211518 CN 90211518 CN 90211518 U CN90211518 U CN 90211518U CN 2062124 U CN2062124 U CN 2062124U
- Authority
- CN
- China
- Prior art keywords
- circuit
- amplifier
- operational amplifier
- electric parameter
- overcurrent
- 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
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a counter-time limiting over-current relay in relay protection, comprising a forming loop for over-current electric parameters composed of an operational amplifier, a detecting-judging circuit and a delay circuit, wherein, the detecting-judging circuit is formed by that the output end of the setting electric parameters and the output end of the over-current electric parameters are both connected with the input end of an amplifier and the output terminal of the amplifier is connected with a delay circuit in a back stage amplifying circuit-the circuit on-off switch of a capacitor charge and discharge circuit. Two stages of amplifiers are both connected with adjustable feedback resistors for adjusting starting values and time base values. The utility model has the advantages of simple structure, high time precision, easy setting calculation and good linearity.
Description
The utility model relates to the making of the inverse-time overcurrent relay of the protection grid short circuit that utilizes the operational amplifier formation in the relaying protection.
Present existing inverse-time overcurrent relay: a kind of is electro permanent magnetic, and it is to utilize the size of hot-wire coil magnetic force to decide the time response of relay, and defective is that its characteristic is saturated fast, cooperates difficulty when using in system; Second kind is made of operational amplifier for static type, and it is to be put together complex circuit designs by many sections broken lines.These two kinds of common defects are that time error is bigger owing to adopt nonlinear circuit, and its operation equation approaches, and therefore must be described the time response of its action by operation curve, and make the calculation of complex of adjusting.
The purpose of this utility model is to overcome above-mentioned defective, designs a kind of new static type inverse-time overcurrent relay, and it is simple in structure, the time precision height, and calculating is easy to adjust.
Technical solution of the present utility model is: utilize the time-delay of the linear characteristic control amplifier of electric capacity charging, its concrete structure comprises: it is amplifier and the current rectifying and wave filtering circuit that operational amplifier constitutes that the overcurrent electric parameter forms circuit one, detect decision circuitry and back level amplification delay circuit, detecting decision circuitry is the subtracting amplifier device of electric parameter and overcurrent electric parameter amplification filtering output formation of adjusting, promptly together insert amplifier input terminal or insert subtracter (operational amplifier), the electric parameter of adjusting is provided by the power supply divider resistance.Delay circuit--be on-off switch in the capacitor charge and discharge loop, electric capacity was connected across between the input and output of post-amplifier in the level amplifying circuit after the output of this amplifier or comparator connect.
The utility model is described in further detail below in conjunction with accompanying drawing:
Fig. 1 is the utility model electrical block diagram, and Fig. 2 is adjustable feedback factor line map.Circuit that relates among the figure and device all are common, the most conventional device and loops that electric loop relates in the relaying protection.Resistance (K
1, K
2) switch (DK) constituted the primary structure in the inverse-time overcurrent relay, promptly detects and judges and timing circuit that operational amplifier can be with any universal, switch (DK) is an electronic non-contact switch AD7510 overcurrent, signal is imported through resistance (R from (I)
1), operational amplifier (A
1) amplify the back and be rectified into direct current to commutating circuit (1), output to filter circuit (2) again, after the elimination high order harmonic component, connection resistance (R
2) after transport to operational amplifier (A
2) an input, the voltage of adjusting is from power supply (E
C) divider resistance (R
3) also transport to this input and be subtraction input, amplifier (A
2) export post-amplifier (A to
4) driving circuits for triggering (3), another output of operational amplifier is by an amplifier (A
3) remove to control delay capacitor (C
1) circuit on on-off switch, resistance (R
5) be restriction (DK) the discharge current amplitude of moment.Overcurrent electric parameter amplifier and detection loop amplifier (A
1, A
2) on be equipped with feedback regulator (K
1, K
2), promptly between its input and output, be provided with adjustable resistance, be R as resistance in parallel
0, 2R
0, 4R
0, 8R
0Four resistance, to regulate the multiplication factor of amplifier.The concrete course of work of the present utility model such as following: when system breaks down, the amplitude of input (I) when adjusting electric parameter, amplifier (A
1) export through resistance (R
2) and (E
C, R
3) after the voltage of adjusting that provides subtracts each other, back level amplifier output on the occasion of, this moment amplifier (A
3) no-output, switch (DK) open circuit, therefore back level amplifier (A
4) output by (A
4, R
4, C) integrating network charging.Time-delay is after move in the triggering loop, and delay time is that the speed of integrating circuit charging depends on amplifier (A
2) output amplitude, with amplification coefficient, ultramagnifier (K
1), (K
2) feedback factor relevant, electric capacity (C
1) determine that feedback factor determines that it is big more to cross the electric parameter amplitude, operate time is short more, on the contrary then operate time long, when short circuit current during less than the starting current adjusted, amplifier (A
1) amplified signal and the anti-phase access amplifier of the electric parameter (A that adjusts
2), it is output as negative value, at this moment amplifier (A
3) output, switch (DK) conducting, electric capacity (C arranged
1) by resistance (R
5) discharge, integrator delay-time circuit is not worked, this can guarantee that electric capacity charging all starts from scratch at every turn, can draw as calculated, when other resistance capacitance is determined value, the startup value of this relay only with (K
1) relevant, with (K
2) relation of being inversely proportional to, and be inversely proportional to the ratio of input current to the startup value, for example work as R
4C
1When time constant was 80 milliseconds, the time base value can be done 1 to 10 second, differentially adjusted by 1 second.Therefore the utility model delay time error is little, and is easy to regulate, the convenience of calculation of adjusting, simple in structure, use reliable.
Claims (4)
1, a kind of inverse-time overcurrent relay, comprise that the overcurrent electric parameter forms the loop--amplification and current rectifying and wave filtering circuit that operational amplifier constitutes, detect decision circuitry and back level amplification delay circuit, triggering and actuator, it is characterized in that detecting decision circuitry and be and adjust electric parameter and the output of overcurrent electric parameter with the amplifier of subtraction input mode input, after the output termination in the level amplifying circuit delay circuit electric capacity charge and discharge on-off switch in the loop [DK].
2,, it is characterized in that detecting that amplifier is an operational amplifier in the decision circuitry, by power supply (E by the described relay of claim 1
C) and divider resistance (R
3) electric parameter of adjusting set is with the same input of overcurrent electric parameter after amplification filtering in the anti-phase access operational amplifier.
3,, it is characterized in that delay circuit is one to be connected across the electric capacity (C between post-amplifier input and the output by claim 1 or 2 described relays
1), on-off switch is in parallel with electric capacity, also is with a resistance on the on-off switch circuit.
4,, it is characterized in that forming the operational amplifier in loop and detect judging between the input/output terminal of operational amplifier in loop being provided with the adjustable feedback resistance of realizing that startup value and time delay base value are adjusted by the overcurrent electric parameter by claim 1 or 2 described relays.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90211518 CN2062124U (en) | 1990-01-06 | 1990-01-06 | Countertime limiting overcurrent relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90211518 CN2062124U (en) | 1990-01-06 | 1990-01-06 | Countertime limiting overcurrent relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2062124U true CN2062124U (en) | 1990-09-12 |
Family
ID=4891300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90211518 Expired - Lifetime CN2062124U (en) | 1990-01-06 | 1990-01-06 | Countertime limiting overcurrent relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2062124U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100440670C (en) * | 2002-08-08 | 2008-12-03 | 中兴通讯股份有限公司 | Monostable comparator device |
| CN101599628B (en) * | 2009-07-10 | 2011-06-29 | 西安电子科技大学 | FPGA-based solid-state power controller inverse time over-current protection device |
-
1990
- 1990-01-06 CN CN 90211518 patent/CN2062124U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100440670C (en) * | 2002-08-08 | 2008-12-03 | 中兴通讯股份有限公司 | Monostable comparator device |
| CN101599628B (en) * | 2009-07-10 | 2011-06-29 | 西安电子科技大学 | FPGA-based solid-state power controller inverse time over-current protection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |