CN1031774C - Single phase earthing protection method and device for small current system - Google Patents
Single phase earthing protection method and device for small current system Download PDFInfo
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- CN1031774C CN1031774C CN 94106374 CN94106374A CN1031774C CN 1031774 C CN1031774 C CN 1031774C CN 94106374 CN94106374 CN 94106374 CN 94106374 A CN94106374 A CN 94106374A CN 1031774 C CN1031774 C CN 1031774C
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Abstract
The present invention relates to a relay protection method of a power system, which is used for solving the problem of single-phase ground protection of a non-direct ground neutral system. The present invention is characterized in that a line with maximum reactive zero sequence harmonic is judged as a grounding line by quick comparison; the present invention relates to two protecting devices which are realized according to the method of the present invention, one of the devices is composed of a harmonic reactive transmitting unit, a maximum comparator and a relay, and the other device is composed of a control unit and a plurality of judging units connected via buses. The two devices has the common characteristics of directionality, high speed, no need of setting, intermittent arc grounding and correct operation of the grounding accompanied by ferromagnetic resonance.
Description
The present invention relates to relay protection of power system technical field, particularly the neutral point not single-phase grounding selecting and the protection of solidly grounded system.
Neutral point is solidly grounded system not; be called for short small current system, to the existing zero sequence overcurrent of its one-phase ground protection, the idle direction of zero sequence, the idle direction of zero sequence quintuple harmonics, colony than the width of cloth, colony than the mutually relative route selection principle of amplitude ratio and corresponding relays or device with microcomputer.But because earth current is little, and, earth current is subjected to multiple stochastic factor such as earth resistance, voltage operation level, load, especially the Zero-pharse harmonic electric current is influenced more serious, make overcurrent and idle directional relay be difficult to set, and arc gap property ground connection and follow the ground connection of ferro resonance to destroy mould incoming interface, sampling and the computational speed of microcomputer device, malfunction also usually takes place in these microcomputer devices, therefore, most of devices only send signal after ground connection.
Yet, in the cable electricity supplying and using system, insulation is in case puncture just very difficult the recovery, arc grounding causes the blast of cable local overheating for a long time, and, the overvoltage multiple that arc grounding causes is very high, causes equipment puncture, two phase ground short circuit, has had a strong impact on the safety in production of industries such as electric power, chemical industry, metallurgy, coal.
The purpose of this invention is to provide a kind of small current system one-phase ground protection method and apparatus, it both had been applicable to isolated neutral system, was applicable to neutral by arc extinction coil grounding system, resistance grounded system again.
The objective of the invention is to realize by following method and apparatus.
A kind of small current system one-phase ground protection method, by collection, filtering to system's zero-sequence current and residual voltage, it is idle to ask for zero sequence, and the residual voltage locking is characterized in that:
＜1〉the input residual voltage obtains Zero-pharse harmonic voltage signal and low-voltage dead lock signal through the overvoltage processing unit;
＜2〉import zero sequence current signal and Zero-pharse harmonic voltage signal together, the Zero-pharse harmonic of asking for every circuit through the idle transmitter of harmonic wave is idle.Inductive is idle for just, and capacitive character is idle for negative;
＜3〉to the Zero-pharse harmonic of all circuits idle through comparator compare a road maximum Zero-pharse harmonic idle for maximum Zero-pharse harmonic idle;
＜4〉the idle set-point of harmonic wave of maximum Zero-pharse harmonic is idle and potentiometer output through comparator relatively, if maximum Zero-pharse harmonic is idle greater than set-point, then comparator output " 1 " is judged to be that to have the idle circuit of this maximum Zero-pharse harmonic be ground path; If maximum Zero-pharse harmonic is idle less than set-point, then comparator output " 0 " is judged to be busbar grounding; The set-point value is slightly larger than zero;
＜5〉if line-to-ground then finds out this circuit number by microprocessor, export charactron to and show this circuit number; Microprocessor output promotes relay and sends out the center-point earth signal, and trip signal is sent out in time-delay; Microprocessor drives printer prints ground connection information; If busbar grounding then finds out this bus numbering by microprocessor, export charactron to and show the bus numbering; Microprocessor output promotes relay and sends out the center-point earth signal; Microprocessor drives printer prints ground connection information.
For isolated neutral system and neutral point resistance grounded system, Zero-pharse harmonic is idle, and finger 1,5,7 subharmonic are idle; For the neutral by arc extinction coil grounding system, Zero-pharse harmonic is idle, and finger 5,7 subharmonic are idle;
If the unit's of getting residual voltage, the then idle component of the idle also nulling of Zero-pharse harmonic preface harmonic current;
If insert accumulation or flat ripple device, the then idle also nulling of Zero-pharse harmonic preface harmonic wave capacity of idle power.
A kind of small current system one-phase ground protection device of realizing claim 1 method is characterized in that: comprise the idle transducing unit of a plurality of harmonic waves, maximum comparator and go into machine interface, relay and voltage processing unit;
The input connecting to neutral sequence voltage signal of voltage processing unit is through output 1 output one road low-voltage dead lock signal, through output 2 outputs one road Zero-pharse harmonic voltage signal;
Two inputs of the idle transducing unit of each harmonic wave connect the zero sequence current signal and the voltage processing unit output 2 of each outlet respectively; The output of the idle transducing unit of harmonic wave connects the input of maximum comparator;
The output of a plurality of idle transducing units of a plurality of input terminations of maximum comparator, the idle set-point of harmonic wave of input termination potentiometer output; The output that enables the termination voltage processing unit 1 of maximum comparator; The output of maximum comparator inserts machine interface and relay; Go into machine interface driving display, printer, device shows or prints ground connection information; Relay output drives the breaking coil and the center-point earth signal of circuit breaker.
The maximum comparator is made of microprocessor and multi-channel analog Acquisition Circuit, and a plurality of harmonic waves do not have a plurality of inputs that function signal and one road set-point signal connect the multi-channel analog Acquisition Circuit, and the output of multi-channel analog Acquisition Circuit connects the input of microprocessor; Microprocessor is found out maximum and corresponding ground path and numbering thereof under the control of comparison program, output connects display and printer, drives relay through output buffer and drive circuit through buffer; The switching value input of microprocessor enables termination voltage processing unit output 1 as the maximum comparator;
The zero sequence current signal of harmonic wave is idle transmitter input 1 connects the input 1 of multiplier through alternating current interface circuit, band pass filter, harmonic wave is idle, and transmitter input 2 harmonic voltage signals connect the input 2 of multiplier, and the output of multiplier does not have function signal through the low pass filter output harmonic wave;
The residual voltage signal of voltage processing unit input connects the input 1 of comparator on the one hand, on the other hand through the input of tape splicing bandpass filter; The input 2 of comparator connects the output of the potentiometer of given starting resistor, and the output of comparator is as the output 1 of voltage processing unit; The output of band pass filter is through the output 2 of phase shifter output harmonic wave voltage signal as the voltage processing unit.
The another kind of small current system one-phase ground protection device of realizing the method for claim 1 is characterized in that: comprise control unit and several judging units that is connected through bus;
Control unit comprises voltage processing unit and microprocessor; Voltage processing unit input connecting to neutral sequence voltage signal, output low-voltage dead lock signal (output 1) and Zero-pharse harmonic voltage signal (output 2); The output 1 of the output 2 of the analog input termination voltage processing unit of microprocessor, switching value input termination voltage processing unit, the output of microprocessor connects center-point earth signal and alarm signal through driver, relay output; Microprocessor connects with judging unit through bus interface circuit, bus;
Judging unit comprises the idle transmitter of harmonic wave, comparator, bus interface circuit, delay circuit and relay and indicator light; The input connecting to neutral preface current signal and the bus signals of the idle transmitter of harmonic wave, output connects the input 1 of comparator; The input 2 of comparator connects bus, and output is exported the circuit breaker trip signal, connect indicator light, links through bus interface circuit, bus and control unit through buffer through delay circuit and relay.
The input of each judging unit connects the zero sequence current signal on every loop line road; The output of judging unit connects the breaking coil of the circuit breaker on this loop line road.
Bus is many holding wires, and the output line of control unit connects the input of judging unit, and the output line of judging unit connects the input of control unit; A plurality of judging units connect successively through bus.
A plurality of judging units start simultaneously, judge under the control of control unit.
Control unit can be by chip microcontroller; Judging unit can be realized by single-chip microcomputer or hardware circuit, so bus can be parallel data bus line, serial data bus, also can be emulation bus.
Fig. 1 is a kind of small current system one-phase ground protection device block diagram.
Fig. 2 is examples of implementation of Fig. 1 device.
Fig. 3 is examples of implementation of voltage processing unit in Fig. 1 device.
Fig. 4 is examples of implementation of the idle transducing unit of harmonic wave in Fig. 1 device.
Fig. 5 is another examples of implementation of small current system one-phase ground protection device.
Fig. 6 is examples of implementation of control unit in Fig. 5 device.
Fig. 7 is examples of implementation of judging unit in Fig. 5 device.
Fig. 8 is another examples of implementation of judging unit in Fig. 5 device.
In Fig. 1, the voltage of bus (101) is drawn the input that residual voltage signal (1) connects voltage processing unit (15) through the open delta of voltage transformer (105), output one road low-voltage dead lock signal (5) of voltage processing unit (15) connects the Enable Pin of maximum comparator (12), and one road harmonic voltage signal (3) connects the input of the idle transducing unit of harmonic wave (11); The input connecting to neutral preface current signal (2) of the idle transducing unit of harmonic wave (11); Zero sequence current signal (2) is obtained by the zero sequence current mutual inductor (104) of circuit (103); The output harmonic wave of the idle transducing unit of harmonic wave (11) does not have the input that function signal (4) connects maximum comparator (12); The output of the idle transducing unit of input termination multichannel harmonic wave of maximum comparator (12), one tunnel connecting to neutral enables termination low-voltage dead lock signal (5), output access machine interface (13) and relay (14); Relay outlet center-point earth signal (9), trip signal (8) drive center-point earth alarm window (106) and circuit breaker trip coil (102) respectively.
In Fig. 2, zero sequence current signal (2) and harmonic voltage signal (3) do not have the input that function signal (4) connects variable connector (31) through the idle transducing unit of harmonic wave (11) output harmonic wave, the output termination gain-programmed amplifier (27) of variable connector (31), sampling holder (28); The output of sampling holder (28) connects the input of analog to digital converter (29); The output of analog to digital converter (29) meets CPU; The control end of variable connector (31), gain-programmed amplifier (27), sampling holder (28) and analog to digital converter (29) connects the delivery outlet of single-chip microcomputer (37); Peripheral hardware (32) comprises that key, charactron, printer meet CPU through importing/go out buffer (33); The output of CPU provides the alarm signal of center-point earth signal (9), trip signal (8) and buzzer (36) through output buffer (20), relay drive circuit (34), relay (14); CPU carries out communication through serial communication line (10) and tension management machine.
In Fig. 3, input residual voltage signal (1) is at first isolated (39) through step-down, exports the input of comparator (18) and the input of band pass filter (22) to; The sliding end of another input termination potentiometer (24) of comparator (18), the stiff end of potentiometer (24) is ground connection and reference power source respectively; Comparator (18) output low-voltage dead lock signal (5); The output of band pass filter (22) is through power amplifier (23) output harmonic wave voltage signal (3).
In Fig. 4, zero sequence current signal (2) is to the input that exchanges current interface (40), the input of the output tape splicing bandpass filter (22) of alternating current interface (40); An input of the output termination multiplier (25) of band pass filter (22), another input termination harmonic voltage signal (3) of multiplier; The output of multiplier (25) does not have function signal (4) through low pass filter (26) output harmonic wave.
In Fig. 5, residual voltage signal (1) through the harmonic voltage signal (3) of voltage processing unit (15) output and low-voltage dead lock signal (5) all to control unit (16); Control unit (16) links to each other with each judging unit (17) through bus (30); Control unit (16) output center-point earth signal (9); Control unit (16) is through whole protective device of serial communication line (10) representative and the communication of tension management machine; Judging unit (17) input zero sequence current signal (2), output trip signal (8).
In Fig. 6, harmonic voltage signal (3) is gone into end through analog input interface (27) to the mould of single-chip microcomputer (37); Low-voltage dead lock signal (5) is to the IO input of single-chip microcomputer (37); Single-chip microcomputer (37) links to each other with bus (30) through bus interface (35); The output of single-chip microcomputer (37) provides alarm signal through drive circuit (34), relay (14) output center-point earth signal (9), driving buzzer (36).
In Fig. 7, bus (30) provides harmonic voltage signal (3) and threshold values signal (6), receives backhaul signals (7) through bus interface (35); Zero sequence current signal (2) and harmonic voltage signal (3) connect two inputs of the idle transducing unit of harmonic wave (11), and output harmonic wave does not have function signal (4); Harmonic wave does not have the A input that function signal (4) connects comparator (18), the B input termination threshold values signal (6) of comparator (18), and the output backhaul signals (7) of comparator (18) connects the input of bus interface (35) and the input of delayer (19); The output of delayer (19) provides trip signal (8) and lights indicator light (21) through drive circuit (34), relay (14).
In Fig. 8, zero sequence current signal (2) is gone into end through alternating current interface (40), analog input interface (27) to the mould of single-chip microcomputer (37); The serial line interface of single-chip microcomputer (37) links to each other with serial data bus (30) through bus interface (35); Button, charactron (32) link to each other with single-chip microcomputer (37) through importing/go out buffer (33); The output of single-chip microcomputer (37) is sent out trip signal (8), is lighted indicator light (21) through drive circuit (34), relay (14).
Any earthing wire-selecting or guard method that method of the present invention is different from the past, it has and need not establish Fixed, band direction, parallel processing, speed are fast, accuracy of judgement, the advantage such as widely applicable, thereby, can be effectively Avoid the impact of the enchancement factors such as earth resistance, voltage levvl, load, and parallel processing can be simultaneously right The zero sequence current signal of every circuit is processed, therefore, and arc grounding, intermittence ground connection with follow ferromagnetic Resonance groundings etc. in particular cases all can correct operation.
Two kinds of earth protective devices of the present invention have all been realized the inventive method, and they are except having side of the present invention Outside the advantage of method, have also that cost is low, reliability is high, be easy to advantage, the especially parallel processings such as installation, maintenance Device can increase software and be extended to the comprehensive Microcomputer Protection of circuit.
Claims (10)
1. small current system one-phase ground protection method, by collection, filtering to system's zero-sequence current and residual voltage, it is idle to ask for zero sequence, and low-voltage dead lock is characterized in that:
1.1 the input residual voltage obtains Zero-pharse harmonic voltage signal and low-voltage dead lock signal through the overvoltage processing unit;
1.2 input zero sequence current signal and Zero-pharse harmonic voltage signal are together, the Zero-pharse harmonic of asking for every circuit through the idle transmitter of harmonic wave is idle; Inductive is idle for just, and capacitive character is idle for negative;
1.3 to the Zero-pharse harmonic of all circuits idle through comparator compare a road maximum Zero-pharse harmonic idle for maximum Zero-pharse harmonic idle;
1.4 the idle set-point of harmonic wave of maximum Zero-pharse harmonic is idle and potentiometer output through comparator relatively, if maximum Zero-pharse harmonic is idle greater than set-point, then comparator output " 1 " is judged to be that to have the idle circuit of this maximum Zero-pharse harmonic be ground path; If maximum Zero-pharse harmonic is idle less than set-point, then comparator output " 0 " is judged to be busbar grounding; The set-point value is slightly larger than zero;
1.5 if line-to-ground then finds out this circuit number by microprocessor, export charactron to and show this circuit number; Microprocessor output promotes relay and sends out the center-point earth signal, and trip signal is sent out in time-delay; Microprocessor drives printer prints ground connection information;
If busbar grounding then finds out this bus numbering by microprocessor, export charactron to and show the bus numbering; Microprocessor output promotes relay and sends out the center-point earth signal; Microprocessor drives printer prints ground connection information.
2. according to the guard method of claim 1, it is characterized in that: for isolated neutral system and neutral point resistance grounded system, Zero-pharse harmonic is idle, and finger 1,5,7 subharmonic are idle; For the neutral by arc extinction coil grounding system, Zero-pharse harmonic is idle, and finger 5,7 subharmonic are idle.
3. according to the guard method of claim 1, it is characterized in that: Zero-pharse harmonic the is idle also idle component or the Zero-pharse harmonic capacity of idle power of nulling preface harmonic current.
4. a small current system one-phase ground protection device of realizing claim 1 method is characterized in that: comprise the idle transducing unit of a plurality of harmonic waves, maximum comparator and go into machine interface, relay and voltage processing unit;
The input connecting to neutral sequence voltage signal of voltage processing unit is through output 1 output one road low-voltage dead lock signal, through output 2 outputs one road Zero-pharse harmonic voltage signal;
Two inputs of the idle transducing unit of each harmonic wave connect the zero sequence current signal and the voltage processing unit output 2 of each outlet respectively; The output of the idle transducing unit of harmonic wave connects the input of maximum comparator;
The output of a plurality of idle transducing units of a plurality of input terminations of maximum comparator, the idle set-point of harmonic wave of input termination potentiometer output; The output that enables the termination voltage processing unit 1 of maximum comparator; The output of maximum comparator inserts machine interface and relay; Go into machine interface driving display, printer, show or printing ground connection information; Relay output drives the breaking coil and the center-point earth signal of circuit breaker.
5. according to the protective device of claim 4, it is characterized in that: the maximum comparator is made of microprocessor and multi-channel analog Acquisition Circuit, a plurality of harmonic waves do not have a plurality of inputs that function signal and one road set-point signal connect the multi-channel analog Acquisition Circuit, and the output of multi-channel analog Acquisition Circuit connects the input of microprocessor; Microprocessor is found out maximum and corresponding ground path and numbering thereof under the control of comparison program, output connects display and printer, drives relay through output buffer and drive circuit through buffer; The switching value input of microprocessor enables termination voltage processing unit output 1 as the maximum comparator;
The zero sequence current signal of harmonic wave is idle transmitter input 1 connects the input 1 of multiplier through alternating current interface circuit, band pass filter, harmonic wave is idle, and transmitter input 2 harmonic voltage signals connect the input 2 of multiplier, and the output of multiplier does not have function signal through the low pass filter output harmonic wave;
The residual voltage signal of voltage processing unit input, one side connects the input 1 of comparator, the input of tape splicing bandpass filter on the other hand; The input 2 of comparator connects the output of the potentiometer of given starting resistor, and the output of comparator is as the output 1 of voltage processing unit; The output of band pass filter is through the output 2 of phase shifter output harmonic wave voltage signal as the voltage processing unit.
6. a small current system one-phase ground protection device of realizing the method for claim 1 is characterized in that: comprise control unit and several judging units that is connected through bus;
Control unit comprises voltage processing unit and microprocessor; Voltage processing unit input connecting to neutral sequence voltage signal, output low-voltage dead lock signal (output 1) and Zero-pharse harmonic voltage signal (output 2); The output 1 of the output 2 of the analog input termination voltage processing unit of microprocessor, switching value input termination voltage processing unit, the output of microprocessor connects center-point earth signal and alarm signal through driver, relay; Microprocessor connects with judging unit through bus interface circuit, bus;
Judging unit comprises the idle transmitter of harmonic wave, comparator, bus interface circuit, delay circuit and relay and indicator light; The input connecting to neutral preface current signal and the bus signals of the idle transmitter of harmonic wave, output connects the input 1 of comparator; The input 2 of comparator connects bus, and output is exported the circuit breaker trip signal, connect indicator light, links through bus interface circuit, bus and control unit through buffer through delay circuit and relay.
7. according to the protective device of claim 6, it is characterized in that: the input of each judging unit connects the zero sequence current signal on every loop line road; The output of judging unit connects the breaking coil of the circuit breaker on this loop line road.
8. according to the protective device of claim 6, it is characterized in that: bus is many holding wires, and the output line of control unit connects the input of judging unit, and the output line of judging unit connects the input of control unit; A plurality of judging units connect successively through bus.
9. according to the protective device of claim 6, it is characterized in that: a plurality of judging units start simultaneously, judge under the control of control unit.
10. according to the protective device of claim 6, it is characterized in that: bus is parallel data bus line, serial data bus or emulation bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94106374 CN1031774C (en) | 1994-06-17 | 1994-06-17 | Single phase earthing protection method and device for small current system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94106374 CN1031774C (en) | 1994-06-17 | 1994-06-17 | Single phase earthing protection method and device for small current system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1099194A CN1099194A (en) | 1995-02-22 |
| CN1031774C true CN1031774C (en) | 1996-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94106374 Expired - Fee Related CN1031774C (en) | 1994-06-17 | 1994-06-17 | Single phase earthing protection method and device for small current system |
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| Country | Link |
|---|---|
| CN (1) | CN1031774C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100386935C (en) * | 2002-11-29 | 2008-05-07 | 清华大学 | Generator stator single phase grounding protection method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110837014B (en) * | 2019-11-01 | 2021-07-20 | 国网新疆电力有限公司哈密供电公司 | Detection method and system for judging whether harmonic voltage amplification is caused by grounding |
-
1994
- 1994-06-17 CN CN 94106374 patent/CN1031774C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100386935C (en) * | 2002-11-29 | 2008-05-07 | 清华大学 | Generator stator single phase grounding protection method |
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| Publication number | Publication date |
|---|---|
| CN1099194A (en) | 1995-02-22 |
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