CN104360215A - Detection device for multi-point earthing fault of small bus N600 - Google Patents
Detection device for multi-point earthing fault of small bus N600 Download PDFInfo
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- CN104360215A CN104360215A CN201410631060.3A CN201410631060A CN104360215A CN 104360215 A CN104360215 A CN 104360215A CN 201410631060 A CN201410631060 A CN 201410631060A CN 104360215 A CN104360215 A CN 104360215A
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Abstract
The invention discloses a detection device for multi-point earthing fault of a small bus N600. The detection device is composed of a constant-current signal generator (A), a signal sampler (B) and a signal analyzer (C) which are connected in the electric loop manner. The constant-current signal generator (A) generates square signals of 5mA, 20mA, 100mA and 200mA and injects the same into the small bus N600; the signal sampler (B) receives and samples the square signals of 5mA, 20mA, 100mA and 200mA which are generated from the constant-current generator (A) and send the same to the signal analyzer (C) to judge whether or not the multi-point earthing fault occurs. The detection device has the advantages that synchronizing signal current measurement is adopted, earthing correctness of the earthing loop N600 is determined through judgment of two currents, thus earthing correctness and validity of the loop N600 of the transformer substation is effectively detected during operation, various interference signals are prevented, judgment is accurate, false alarm is avoided, and earthing fault is eliminated.
Description
Technical field
The present invention relates to electric system checkout equipment field, be specifically related to substation relay protection PT bis-common return N600 multipoint earth faults pick-up units.
Background technology
Protective relaying device wiring is complicated, and the secondary circuit of PT is on-the-spot to pulpit from outdoor PT, and end case is to protection screen, and circuit is various, and wire is longer.Zero line through pulpit claims the little bus of N600; power industry and national grid " relay protection of power system anti-accident measures " all clear stipulaties; the secondary circuit of several groups of voltage transformer (VT) that mutually little bus N600 is communicated with through pulpit zero; only should at pulpit one point earth; if there is multipoint earth faults, protective relaying device and automatic safety device incorrect operation under serious conditions, can be caused.
Often there is on-the-spot ground connection and the simultaneous situation of pulpit ground connection in the loop of the voltage transformer (VT) of N600 substation relay protection; on-the-spot distant with pulpit; the current potential of place grounded screen is different; there is earth fault as substation line exit or be struck by lightning; grounded screen will flow through very large electric current, produces potential difference (PD) between two earth points.Its potential difference (PD) may cause the sampling of protective relaying device PT signal incorrect; the signal flowing through protective relaying device just cannot go out primary side magnitude of voltage and phase place by accurate response; cause the incorrect work of protective relaying device; such as voltage reaches protection definite value; effective locking is failed in relay protection, and it is very harmful that visible N600 multipoint earthing causes.
Under transformer station's normal operation, Secondary Circuit of Potential Transformer N600 network communicates, and occurs that one point earth and multipoint earthing are difficult to find under normal operating condition.For the transformer station do not put into operation, ground connection can be adopted to show the judgement of true N600 single-point grounding.The transformer station put into operation cannot adopt earthing megohm meter method to measure, it is more difficult to test when there is more than 2 earth points, current instrument cannot accurately judge, although what have proposes the method that the N600 multipoint earth faults of signal input method to P judge, owing to there is wiring complexity, on-the-spot interference is large, and the problems such as accuracy of instrument, are not effectively applied.
Summary of the invention
The object of the invention is to: a kind of N600 multipoint earth faults pick-up unit is provided, make the judgement of accuracy for substation relay protection PT bis-common return single-point groundings, solve transformer station N600 line and whether there is multipoint earthing problem.
Technical solution of the present invention is: this N600 multipoint earth faults pick-up unit is connected and composed according to electric circuit type by constant current signal generator, signal sampler and signal analyzer; Constant current signal generator comprises low frequency signal source, signal madulation unit, signal amplification unit, signal output unit, synchronizing signal transmitting element; Signal sampler forms with current transformer, measures the constant current signal that constant current signal generator is brought; Signal analyzer comprises current signal amplifying unit, synchronous Signal Receiver Unit, signal syntheses processing unit, A/D converter, CPU and liquid crystal display.
Wherein, low frequency signal source in constant current signal generator connects with signal madulation unit, signal madulation unit connects with signal amplification unit, signal amplification unit connects with signal output unit, low frequency signal source connects with synchronizing signal transmitting element, low frequency signal source produces signal and becomes a square-wave signal through signal madulation, after amplifying, point two-way exports, one tunnel is fed in N600 solidus through signal output unit, leads up to the wireless generation of synchronizing signal transmitting element.
Wherein, signal sampler in signal analyzer and current signal amplifying unit connect, signal amplification unit connects with synchronous Signal Receiver Unit, current signal amplifying unit receiving element synchronous with signal connects with signal syntheses processing unit, and signal syntheses processing unit and A/D converter connect, A/D converter converter connects with CPU, CPU connects with liquid crystal display; The signal that signal sampler is brought by current signal amplifying unit, after being amplified by signal amplification unit signal, the non-constant current signal source generator removing out of phase under synchronizing signal effect produces signal; After the synthesis process of signal syntheses processing unit, calculated by CPU after A/D converter conversion, determine whether multipoint earthing occurs.
During work, the square wave current signal that signal picker samples is delivered to signal analyzer and is judged, analyzes whether multipoint earth faults occurs; The constant-current supply signal that constant current signal generator produces is delivered on the little bus of N600, signal sampler sampling constant current signal generator is injected on the little bus of N600, signal analyzer analysis judges that whether the electric current of the constant current signal generator of signal picker is consistent with the electric current of signal sampling, if consistent, be just judged as single-point grounding; If it is inconsistent that the current signal that current signal on the little bus of N600 and collector sample delivered to by constant current signal generator, be just judged as multipoint earthing.
The present invention compared with prior art, beneficial effect is embodied in: 1, adopt synchronizing signal current measurement, utilize the judgement of two electric currents to determine the correctness of N600 ground loop ground connection, effective measurement afoot transformer station N600 loop ground connection validity and correctness, prevent various undesired signal, it is very accurate to judge, without wrong report phenomenon; When 2, there is multipoint earth faults, adopt portable current clamp to judge earth fault to occur, accuracy of judgement on any N600 loop, be conducive to getting rid of earth fault.
Accompanying drawing explanation
Fig. 1 is the device schematic diagram that the present invention judges N600 multipoint earthing.
Fig. 2 is constant current signal generator schematic diagram.
Fig. 3 is signal analyzer schematic diagram.
Embodiment
As shown in Figure 1, this N600 multipoint earth faults pick-up unit is connected and composed according to electric circuit type by constant current signal generator A, signal sampler B, signal analyzer C; Constant current signal generator A produces 5mA, 20mA, 100mA, 200mA square-wave signal, notes on the little bus of N600; Signal picker B receives 5mA, 20mA, 100mA, 200mA square-wave signal that constant current signal generator A produces, the square wave current signal that signal picker B samples the different electric currents that constant current signal generator A produces is delivered to signal analyzer C and is judged, analyzes whether send out multipoint earth faults; The constant-current supply signal that constant current signal generator A produces is fed on the little bus of N600, and signal sampler B sampling constant current signal generator A is injected on the little bus of N600, and signal analyzer C analyzes the electric current I judging the constant current signal generator of signal picker B
1whether with the electric current I of signal sampling
2unanimously, represent there is no duplexure and parasitic loop, be judged as single-point grounding; The current signal I on the little bus of N600 delivered to by constant current signal generator
1the current signal I sampled with collector
2inconsistent, be judged as multipoint earthing; Constant current signal generator electric current I
1equal 0, signal sampling electric current I
2when also equaling 0, represent that N600 does not have ground connection, or there is open fault in ground loop.
As shown in Figure 2, constant current signal generator A includes: low frequency signal source 1, signal madulation unit 2, signal amplification unit 3, signal output unit 4, synchronizing signal transmitting element 5; Low frequency signal source 1 in constant current signal generator connects with signal madulation unit 2, signal madulation unit 2 connects with signal amplification unit 3, signal amplification unit 3 connects with signal output unit 4, low frequency modulations unit 2 connects with synchronizing signal transmitting element 5; Low frequency signal source mainly adopts R.C oscillatory circuit, and by defining the square wave of a 5HZ to the discharge and recharge of R.C, the resistance value of R is here 10K, and electric capacity C value is 1 μ F, and reference source adopts LM336/5V; Low frequency signal source 1 in constant current signal generator produces square wave, frequency is the square wave of 5HZ, the power supply signal that constant current signal source 1 produces is through signal madulation unit 2, signal madulation becomes the current square-wave signal of 5mA, 20mA, 100mA, 200mA tetra-different gears, deliver to signal amplification unit 3, signal amplification unit 3 carries out power amplification, ensures current stability during ground loop low resistance; Signal amplification unit 3 signal delivers to signal output unit 4, injects the little bus of N600, and making has 5mA, 20mA, 100mA, 200mA different order electric current constant-current supply between the little bus of N600 and the earth; Signal madulation unit 2 modulates another signal and delivers to synchronizing signal transmitting element 5 and carry out the synchronizing signal of wireless square-wave signal transmission as signal constant-current supply, this signal is sent by wireless transmission unit 5, ensure that the signal received can synchronously process, remove other signal disturbing, ensure that precision; The current signal that low frequency signal source is brought mainly is divided into the different gear square wave currents of 5mA, 20mA, 100mA, 200mA by signal madulation unit 2, modulating unit is automatically each on the current gear of these four different sizes exported for 5 seconds, made to switch in the electric current of these four different gears; The signal that signal madulation unit 2 is brought by signal amplification unit 3 carries out constant current and amplifies guarantee output power, makes carrying load ability can reach 0-1K Ω; Signal output unit 4 adopts to push off the output of formula signal, this signal output loop mainly adopts 10 IN4007 diode series connection, oppositely receive on N600 loop, ensure that loop current is if there is when being greater than the voltage of 7V, can not send constant current signal transmission source and damage phenomenon; Synchronizing signal transmitting element 5 mainly adopts the standard-frequency signal of 433.MHZ to send, this signal is consistent with the frequency of televisor, kids toys, it is general a kind of signal, be widely used in every profession and trade and occasion, here mainly for the signal of low frequency signal source produces a basic source signal, whether the signal providing a reference signal to carry out the process of decision signal analyzer for signal analyzer is accurate.
As shown in Figure 3, signal analyzer C includes: current signal amplifying unit 6, synchronous Signal Receiver Unit 7, signal syntheses processing unit 8, A/D converter 9, CPU10, display 11; Its circuit connects: signal sampler B exports and current signal amplifying unit 6 connects; Signal amplification unit 6 connects with signal syntheses processing unit 8, and the synchronous receiving element 7 of signal connects with signal syntheses processing unit 8; Signal syntheses processing unit 8 exports and A/D converter 9 connects, and A/D converter 9 connects with CPU10; CPU10 connects with display 11; Signal sampler B is responded to the current signal sampled by signal analyzer C, through the amplification process of current signal amplifying unit 6, signal amplify after be signal syntheses processing unit carry out process also deliver to signal syntheses processing unit 8 to the synchronizing signal of synchronous Signal Receiver Unit 7 receiving loop, carry out signal syntheses process; By the signal of different frequency, out of phase under the effect of synchronizing signal, remove the electric current of other compositions, effective 5HZ and same-phase, to synthesize with the current signal of angle square wave, whole removals of other alien frequencies and out of phase, ensure that correctness and the uniqueness of sample of signal, signal is delivered to A/D converter 9 and is carried out A/D conversion after the synthesis process of signal syntheses processing unit 8, deliver to singlechip CPU 10 again and carry out computing, computing ground connection correctness, result is shown by display 11 by CPU10; Instrument has removable, feature easy to carry; Current signal sampling thief B adopts the electric current of current clamp induction N600 ground loop, due to sampling thief the electric current of returning of sampling be 5mA, 20mA, 100mA, 200mA fourth gear be respectively 5 seconds, the signal of its current clamp must amplify, and is amplified to the 0-2V voltage corresponding to A/D converter; Synchronous Signal Receiver Unit, receive the measuring-signal that the synchronizing signal transmitting element 5 in constant current signal generator sends over, accurate synthesis sampling thief B adopts the current value of different gear and different time, this different current value measure different time sections, the square wave of out of phase, different frequency square wave whether consistent; The signal of signal syntheses processing unit 8 received by signal amplification unit 6 and synchronous Signal Receiver Unit 7 synthesizes, if be unanimously, just confirm as effectively, will be refused by signal syntheses processing unit if inconsistent, effectively distinguished, particularly remove the interference in 50HZ power frequency source, whether the current value of different frequency and different time sections coincide, and so just effectively determines and determined its accuracy; Current sensor in signal sampler B adopts the WHX001 current sensor produced by Zhejiang Ke Chang Electronics Co., Ltd., and measurement range is 0-500mA, output voltage 0-1V; Signal amplification unit Selecting operation amplifier LM358 is the operational amplification circuit of main part composition, and the enlargement factor 0-100 of circuit is doubly adjustable; Reception of wireless signals adopts synchronous Signal Receiver Unit, the TDX module that Shenzhen Xin Da scientific & technical corporation produces, and data transmission format is 8N1/8E1/801, external antenna mode, and model is TDX1145-25522, and power is 20mW, and interface frequency is 19200; A/D converting unit adopts MC14433, is 12 A/D converters, in its benchmark; Cpu chip adopts conventional AT89C89 single-chip microcomputer produced in USA, and display is 320/240 lattice lcd screen; All be arranged on by all circuit in a housing, constitute signal analyzer C, product is easy to use, does not need manual intervention, and the electric current under instrument automatic analysis different time accurately determines whether to there occurs N600 multipoint earthing, and the method is simple, accurate.
Claims (3)
1. N600 multipoint earth faults pick-up unit, is characterized in that: it is connected and composed according to electric circuit type by constant current signal generator (A), signal sampler (B), signal analyzer (C); Constant current signal generator (A) produces 5mA, 20mA, 100mA, 200mA square-wave signal, notes on the little bus of N600; Signal picker (B) receives 5mA, 20mA, 100mA, 200mA square-wave signal that constant current signal generator (A) produces, the square wave current signal that signal picker (B) samples the different electric currents that constant current signal generator (A) produces is delivered to signal analyzer (C) and is judged, analyzes whether send out multipoint earth faults; The constant-current supply signal that constant current signal generator (A) produces is fed on the little bus of N600, signal sampler (B) constant current signal generator (A) of sampling is injected on the little bus of N600, and signal analyzer (C) analysis judges the electric current I of the constant current signal generator of signal picker (B)
1whether with the electric current I of signal sampling
2unanimously, represent there is no duplexure and parasitic loop, be judged as single-point grounding; The current signal I on the little bus of N600 delivered to by constant current signal generator
1the current signal I sampled with collector
2inconsistent, be judged as multipoint earthing; Constant current signal generator electric current I
1equal 0, signal sampling electric current I
2when also equaling 0, represent that N600 does not have ground connection, or there is open fault in ground loop.
2. N600 multipoint earth faults pick-up unit according to claim 1, is characterized in that: constant current signal generator (A) includes: low frequency signal source (1), signal madulation unit (2), signal amplification unit (3), signal output unit (4), synchronizing signal transmitting element (5); Low frequency signal source (1) in constant current signal generator connects with signal madulation unit (2), signal madulation unit (2) connects with signal amplification unit (3), signal amplification unit (3) connects with signal output unit (4), low frequency modulations unit (2) connects with synchronizing signal transmitting element (5); Low frequency signal source adopts R.C oscillatory circuit, and by defining the square wave of a 5HZ to the discharge and recharge of R.C, the resistance value of R is 10K, and electric capacity C value is 1 μ F, and reference source adopts LM336/5V; Low frequency signal source (1) in constant current signal generator produces square wave, frequency is the square wave of 5HZ, the power supply signal that constant current signal source (1) produces is through signal madulation unit (2), signal madulation becomes the current square-wave signal of 5mA, 20mA, 100mA, 200mA tetra-different gears, deliver to signal amplification unit (3), signal amplification unit (3) carries out power amplification, ensures current stability during ground loop low resistance; Signal amplification unit (3) signal delivers to signal output unit (4), injects the little bus of N600, and making has 5mA, 20mA, 100mA, 200mA different order electric current constant-current supply between the little bus of N600 and the earth; Signal madulation unit (2) modulates another signal and delivers to synchronizing signal transmitting element (5) and carry out the synchronizing signal of wireless square-wave signal transmission as signal constant-current supply, this signal is sent by wireless transmission unit (5), ensure that the signal received synchronously processes, remove other signal disturbing; The current signal that low frequency signal source is brought by signal madulation unit (2) is divided into the different gear square wave currents of 5mA, 20mA, 100mA, 200mA, modulating unit is automatically each on the current gear of these four different sizes exported for 5 seconds, made to switch in the electric current of these four different gears; The signal that signal madulation unit (2) is brought is carried out constant current and amplifies guarantee output power by signal amplification unit (3), makes carrying load ability can reach 0-1K Ω; Signal output unit (4) adopts to push off the output of formula signal, this signal output loop adopts 10 IN4007 diode series connection, oppositely receive on N600 loop, ensure that loop current is if there is when being greater than the voltage of 7V, can not send constant current signal transmission source and damage phenomenon; Synchronizing signal transmitting element (5) adopts the standard-frequency signal of 433.MHZ to send, and the signal for low frequency signal source produces a basic source signal, and whether the signal providing a reference signal to carry out the process of decision signal analyzer for signal analyzer is accurate.
3. N600 multipoint earth faults pick-up unit according to claim 1, is characterized in that: signal analyzer (C) includes: current signal amplifying unit (6), synchronous Signal Receiver Unit (7), signal syntheses processing unit (8), A/D converter (9), CPU(10) and display (11), its circuit connects: signal sampler (B) exports and current signal amplifying unit (6) connects, signal amplification unit (6) connects with signal syntheses processing unit (8), and the synchronous receiving element of signal (7) connects with signal syntheses processing unit (8), signal syntheses processing unit (8) exports and A/D converter (9) connects, A/D converter (9) and CPU(10) connect, CPU(10) connect with display (11), signal sampler (B) is responded to the current signal sampled by signal analyzer (C), through the amplification process of current signal amplifying unit (6), signal is that the synchronizing signal of synchronous Signal Receiver Unit (7) receiving loop is also delivered to signal syntheses processing unit (8) and carried out signal syntheses process after amplifying, by different frequency, the signal of out of phase is under the effect of synchronizing signal, remove the electric current of other compositions, effective 5HZ and same-phase, current signal with angle square wave synthesizes, whole removals of other alien frequencies and out of phase, ensure correctness and the uniqueness of sample of signal, signal is delivered to A/D converter (9) and is carried out A/D conversion after the synthesis process of signal syntheses processing unit (8), deliver to singlechip CPU 10 again and carry out computing, computing ground connection correctness, CPU(10) result is shown by display (11), current signal sampling thief (B) adopts current clamp to respond to the electric current of N600 ground loop, sampling thief the electric current of returning of sampling be 5mA, 20mA, 100mA, 200mA fourth gear be respectively 5 seconds, the signal of its current clamp must amplify, and is amplified to the 0-2V voltage corresponding to A/D converter, synchronous Signal Receiver Unit, receive the measuring-signal that the synchronizing signal transmitting element (5) in constant current signal generator sends over, sampling thief (B) adopts the current value of different gear and different time, this different current value measure different time sections, the square wave of out of phase, different frequency square wave whether consistent, the signal of signal syntheses processing unit (8) received by signal amplification unit (6) and synchronous Signal Receiver Unit (7) synthesizes, if be unanimously, just confirm as effectively, will be refused by signal syntheses processing unit if inconsistent, particularly remove the interference in 50HZ power frequency source, whether the current value of different frequency and different time sections coincide, and so just effectively determines and determined its accuracy, current sensor in signal sampler (B) adopts the WHX001 current sensor produced by Zhejiang Ke Chang Electronics Co., Ltd., measurement range 0-500mA, output voltage 0-1V, signal amplification unit Selecting operation amplifier LM358 is the operational amplification circuit of main part composition, and the enlargement factor 0-100 of circuit is doubly adjustable, reception of wireless signals adopts synchronous Signal Receiver Unit, the TDX module that Shenzhen Xin Da scientific & technical corporation produces, and data transmission format is 8N1/8E1/801, external antenna mode, and model is TDX1145-25522, and power is 20mW, and interface frequency is 19200, A/D converting unit adopts MC14433, is 12 A/D converters, in its benchmark, cpu chip adopts conventional AT89C89 single-chip microcomputer produced in USA, and display is 320/240 lattice lcd screen, all circuit are all arranged in a housing, constitute signal analyzer (C).
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| CN107533098A (en) * | 2015-03-11 | 2018-01-02 | 德恩及索恩两合股份有限公司 | Method for status determination and fault localization on an insulated down conductor installed in an external lightning protection device |
| CN111929613A (en) * | 2020-08-07 | 2020-11-13 | 中国南方电网有限责任公司超高压输电公司梧州局 | Same-section bus parasitic loop online monitoring device based on alternating current leakage current sensor |
| CN112557951A (en) * | 2020-12-10 | 2021-03-26 | 中国科学院合肥物质科学研究院 | On-line monitoring device of grounding system |
| CN113359003A (en) * | 2021-04-26 | 2021-09-07 | 中国南方电网有限责任公司超高压输电公司梧州局 | DC parasitic loop detection system and method |
| CN114002547A (en) * | 2021-10-25 | 2022-02-01 | 国网湖北省电力有限公司恩施供电公司 | Secondary multipoint earth fault judgment equipment and analysis algorithm for mutual inductor |
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| CN113359003A (en) * | 2021-04-26 | 2021-09-07 | 中国南方电网有限责任公司超高压输电公司梧州局 | DC parasitic loop detection system and method |
| CN113359003B (en) * | 2021-04-26 | 2024-04-02 | 中国南方电网有限责任公司超高压输电公司梧州局 | DC parasitic loop detection system and method |
| CN114002547A (en) * | 2021-10-25 | 2022-02-01 | 国网湖北省电力有限公司恩施供电公司 | Secondary multipoint earth fault judgment equipment and analysis algorithm for mutual inductor |
| CN114002547B (en) * | 2021-10-25 | 2024-02-02 | 国网湖北省电力有限公司恩施供电公司 | Equipment for judging secondary multipoint ground fault of transformer and analysis algorithm |
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