CN2032325U - Automatic tour detector with dc earthing - Google Patents
Automatic tour detector with dc earthing Download PDFInfo
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- CN2032325U CN2032325U CN 87213919 CN87213919U CN2032325U CN 2032325 U CN2032325 U CN 2032325U CN 87213919 CN87213919 CN 87213919 CN 87213919 U CN87213919 U CN 87213919U CN 2032325 U CN2032325 U CN 2032325U
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Abstract
The utility model discloses an automatic tour detector with DC system earthing, composed of a DC system earthing automatic detector, a current mutual inductor and a portable detector. The automatic tour detector is a special device for detecting the DC system earthing points of the power station, and the transformer station factory and the large-scale complete equipment, belonging to the device developed and used for the first time in China. When the DC system (protecting and controlling a power supply) generates earth faults, the automatic tour detector can not be cut off the power supply and doesn't affect the normal operation of the equipment, the control power source is not disconnected, the automatic tour detector can automatically detect the DC earthing loop, sent out alarm and display the number of the fault loop, and then the portable detector quickly checks out the positions of the earthing points. The device has stable and reliable performance and convenient use.
Description
This device is the power house, the novel instrument of the automatic detection of ground faults of transforming station direct current system.When ground connection takes place in straight-flow system, this device does not influence the normal operation of equipment, need not disconnect the control power supply yet, just can detect loop and earth point that DC earthing takes place automatically, send warning, demonstrate the fault loop numbering with numeral simultaneously, thereby can repair rapidly, avoid expanding as more major break down.
Existing power house; direct supply in the electric substation is mainly used in protection and control circuit, and circuit is of a great variety, and branch line in length and breadth; the terminal box of a large amount of cables and switchyard, operating mechanism etc. are connected; it is higher that the ground connection probability takes place, and the past is continued to use manual mode always, disconnects every DC loop successively; detect the DC earthing point; not only time-consuming, also threaten the safe operation of equipment, influence normal power supply.
Task of the present utility model is to develop a kind ofly neither need have a power failure, and can find out the loop of DC earthing and the pick-up unit of earth point automatically fast again.
Technical design scheme of the present utility model, be by the dc system grounding automatic tester, current transformer and portable detector three parts constitute, when earth fault appears in straight-flow system, the dc system grounding automatic tester, automatically show the numbering and the polarity of earthing cable, and send alerting signal.Find the definite position of earth point then with portable detector.Adopt " variable resistor " principle technically, the DC earthing current transformation is become ac current signal, so that current transformer detects.In figure one, when the arbitrary cable that is connected on dc power anode or negative pole took place by ground connection, ground current translation circuit (7) was transformed into the 11HZ sinusoidal current signal with grounding DC signal, and the divider resistance through being connected on the direct supply is fed on the earthing cable.The cover be through on this cable current transformer (22) just immediately sensitivity go out this signal, lower limit circuit (6) is under the control of ground current signal, open and select circuit (5), when the input automatic selection circuit of being made up of automatic signal (1), single step signal (2), counter (3) and signal selecting circuit (5) searches when being connected this road of current transformer (22), select circuit (5) just the detected signal conveys of current transformer (22) to low-pass filter amplifier (8).The signal that is exaggerated is through band-pass filter amplifier (9), interference or noise are filtered, obtain the AC signal of 11HZ, this signal passes through low-pass filter amplifier (10) again and phase-sensitive detector (PSD) (11) is handled, just obtained the DC voltage of reflection positive-negative polarity, control polarity indicating circuit (25) shows its polarity of ground, the DC voltage (plus or minus) of phase-sensitive detector (PSD) (11) output, amplify through absolute value amplifying circuit (12), and deliver to comparator circuit (13) and threshold voltage and compare, if this DC voltage surpasses the alarm threshold of regulation, just then comparer is controlled warning circuit (14) and sent alerting signal.Control simultaneously stops to search signal of sealing up a door of circuit (4) output, makes counter stop counting, and digital display circuit (15) just demonstrates the earthing cable numbering, otherwise the input automatic selection circuit will continue to search downwards.
Portable detector in figure two, it is the position that is used to search earth point, when the dc system grounding automatic tester send the grounding alarm signal and show polarity of ground and cable number after, entangle this cable with portable forcipated mutual-inductor (24) pincers, the ground current signal that mutual inductor (24) goes out sensitivity is immediately delivered to low-pass filter amplifier (16), the signal that is exaggerated is through band-pass filter amplifier (17), low-pass filter amplifier (18) becomes the stable 11HZ AC signal that certain amplitude is arranged.The effect of anti-jamming circuit (19) is to suppress power frequency to disturb and other interference, and the 11HZ AC signal of detected amplification is sent alerting signal through anti-jamming circuit (19) control warning circuit (20).
Phase-sensitive detector (PSD) in figure three (11) is for the current separation that flows through on the electrostatic capacitance is over the ground gone out.Because the electric current that flows through on electric current that flows through on the electric capacity and the stake resistance differs 90 ° on phase place, after full-wave rectification, positive and negative half-wave is offset respectively.The current signal that flows through stake resistance, adds on the phototriode of photoelectric coupling circuit after the Filtering Processing through amplifying, and light emitting diode plays on-off action.When the signal and the same phase time of synchronizing signal (from signal source) that adds on the light emitting diode that are added on the phototriode, operational amplifier is just exported positive all-wave voltage; If when anti-phase, operational amplifier is just exported negative all-wave voltage.This voltage just becomes the DC voltage that positive-negative polarity is arranged after filtering.
Single step signal (2) in figure four, the R.S end of its rest-set flip-flop is by resistance eutral grounding, and the intermediate contact of microswitch K meets power supply V
DD, at ordinary times the contact 2., 3. communicate, Q exports high level.When pressing K, 1., 3. the contact is connected, the Q output low level.After unclamping K, the contact 2., 3. communicate, Q is high level again.Whenever by once, just produce a negative pulse, make counter (3) content add 1, realized manual single step tally function.
Lower limit circuit (6) in figure five becomes switching signal with the ground current signal.When stake resistance reaches the resistance value of regulation, adjust potentiometer W, make BG
1And BG
2End, this circuit output level "0", just opening signal is selected circuit (5); Otherwise, then make BG
1And BG
2Conducting, the output level"1" is closed (5).
Anti-jamming circuit in figure six (19).Utilize at random undesired signal and the difference between the stable ground current signal, choose suitable R
1, C
1And BG
3, when the ground current signal is arranged, BG
3The reliable puncture makes BG
4Conducting.BG
5End.C
2Pass through R
2Charge to alarm level.The amplitude instability of random disturbance signal, the duration is short, is difficult to puncture BG
3, C
2Can not be charged to alarm level, thereby undesired signal is inhibited.
Ground current translation circuit in figure seven, after the cable generation ground connection that is connected on the direct supply, just make triode, circuit that resistance and diode bridge etc. constitute and direct supply are altogether, signal source adds to triode by photoelectric coupling circuit, under the control of diode bridge, form the current signal of certain orientation.
The utility model adopts a stable clock circuit, and per second can detect a DC loop automatically.Installed capacity can go the rounds to detect whether ground connection of 80 DC loop successively, and it can detect earthing position quickly and accurately.Can the insulation situation of straight-flow system be monitored automatically simultaneously; this device is not only applicable to all size power house; the straight-flow system of electric substation, and be applicable to various factories, direct current protecting in the large sized complete sets of equipment and control system; advanced technology; circuit is simple, and is highly sensitive, easy to use; working stability is reliable, belongs to domestic development first and uses.
The utility model accompanying drawing
Figure one. the automatic data-logger general diagram of dc system grounding
Figure two. the portable detector block diagram
Figure three. phase-sensitive detector (PSD)
Figure four. and manually single step forms circuit
Figure five. the lower sensitivity limit circuit
Figure six. anti-jamming circuit
Figure seven. the ground current translation circuit
With reference to description of drawings specific embodiments of the present utility model be:
The utility model is by the dc system grounding automatic tester, current transformer, and portable detector constitutes.The dc system grounding automatic tester is formed in (1)～(15) and (25) among the figure one, is contained in 360 * 280 * 160 the cabinet.Power light is arranged, the digital demonstration, polarity pilot lamp, automatic and hand control switch, single step button and self-test switch on the cabinet panel.Backboard has the current transformer input panel, and power supply input and standby terminal block also are equipped with fuse holder.
Current transformer among the figure one, by the MX-2000 magnetic core, the pitch of the laps of plastic shaping bobbin and φ 0.1 enameled wire coiling constitutes.With the whole embedding of three's tap, manufacturing process is very simple, is convenient to produce in enormous quantities at last.
Figure two is a portable detector.Its printed circuit board (PCB) is contained in 185 * 67 * 30 the plastic housing, and the front end of shell is equipped with pincerlike magnetic head, and power switch and pilot lamp are equipped with in the right side.After automatic ground connection detector is pointed out earthing cable numbering and polarity, entangle the cable that earth fault takes place with forcipated mutual-inductor, opening power, this moment, portable detector can send the warning sound.From direct supply, look into to load end with the optimum seeking method segmentation along cable, detect the position that some can find earth point, the portable detector reliable operation, easy to use.
Claims (6)
1, the automatic data-logger of a kind of Novel DC system earth.Form by dc system grounding automatic tester, portable detector summation current transformer.Described current transformer is made of the whole tap embedding of MX-2000 FERRITE CORE, plastic shaping bobbin and coil; Described dc system grounding automatic tester is made of signal selecting part branch (1), (2), (3), (5), (15), ground current conversion fraction (6), (7) and ground signalling test section (4), (8), (9), (10), (11), (12), (13), (14), (25); Described portable detector is made of forcipated mutual-inductor (24) and signal deteching circuit (16), (17), (18), (19), (20).It is characterized in that:
A, when ground connection takes place in the straight-flow system cable, the ground current translation circuit with resistance with (29) direct supply dividing potential drop, get its middle current potential, signal is transformed into AC signal through triode, resistance, photoelectric coupling circuit, diode-bridge circuit with the ground connection dc current signal.Deliver to the cable that ground connection is taken place, so that by detections such as current transformer (22), (28).
B, stake resistance (21) are during less than setting, and lower sensitivity limit circuit (6) start signal selects circuit (5), counter (3) under automatic signal (1) or single step signal (2) effect, is demonstrated the cable number of ground connection by digital display circuit (15).
C, the direct-flow ground signalling testing circuit ground current signal that current transformer (22) is responsive, deliver to signal selecting circuit (5), through low-pass filter amplifier (8), band-pass filter amplifier (9), low-pass filter amplifier (10), after phase-sensitive detector (PSD) (11), absolute value amplifying circuit (12) and comparator circuit (13) are handled, if surpass specified thresholds, just control warning circuit (14) and send alerting signal, and point out polarity of ground by polarity of ground indicating circuit (25).
D, detection earth point.Detect to load end (26) segmentation from dc power supply terminal with portable detector.The detected ground signalling of forcipated mutual-inductor (24), through low-pass filter amplifier (16), band-pass filter amplifier (17), low-pass filter amplifier (18), after anti-dried reactive circuit (19) was handled, warning circuit (20) sent alerting signal always, when the detection position of portable detector exceeds earth point, this alarm blackout illustrates it is earth point herein.
2, pick-up unit according to claim 1 is characterized in that: the phase-sensitive detector (PSD) in the dc system grounding automatic tester, and by two-way photoelectric coupling circuit, compositions such as operational amplifier, resistance, capacitor.
3, pick-up unit according to claim 1 is characterized in that: the counter input single step waveshaping circuit in the dc system grounding automatic tester, by single step switch, bistable state rest-set flip-flop and resistance constitute.
4, pick-up unit according to claim 1 is characterized in that: the anti-jamming circuit in the portable detector is made of transistor, diode, voltage stabilizing diode, resistance, capacitor.
5, pick-up unit according to claim 1 is characterized in that: the lower sensitivity limit circuit in the dc system grounding automatic tester is by unidirectional photoelectric coupling circuit, triode, and CMOS gate circuit, resistance, electric capacity and potentiometer constitute.
6, pick-up unit according to claim 1 is characterized in that: current transformer (22) is set on the straight-flow system cable that will detect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87213919 CN2032325U (en) | 1987-10-01 | 1987-10-01 | Automatic tour detector with dc earthing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87213919 CN2032325U (en) | 1987-10-01 | 1987-10-01 | Automatic tour detector with dc earthing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2032325U true CN2032325U (en) | 1989-02-08 |
Family
ID=4828332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87213919 Withdrawn CN2032325U (en) | 1987-10-01 | 1987-10-01 | Automatic tour detector with dc earthing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2032325U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100401078C (en) * | 2004-02-03 | 2008-07-09 | 台达电子工业股份有限公司 | Earth fault detection circuit for battery |
| CN101256206B (en) * | 2007-02-27 | 2011-07-20 | 上海市电力公司 | Method for measuring and recording mutation current of neutral point earthing resistor |
| CN103913655A (en) * | 2014-03-17 | 2014-07-09 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Direct-current common grounding electrode state monitoring system and state assessment method |
| CN104653473A (en) * | 2014-06-13 | 2015-05-27 | 阮树成 | Solar power supply remote measure and control three-phase motor full automatic irrigation water pump |
| CN105044549A (en) * | 2015-04-14 | 2015-11-11 | 广西电网有限责任公司电力科学研究院 | Direct current grounding searching method with self compensation current |
| CN110850330A (en) * | 2018-08-02 | 2020-02-28 | 半导体组件工业公司 | Ground fault interrupter self-test circuit and related method |
-
1987
- 1987-10-01 CN CN 87213919 patent/CN2032325U/en not_active Withdrawn
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100401078C (en) * | 2004-02-03 | 2008-07-09 | 台达电子工业股份有限公司 | Earth fault detection circuit for battery |
| CN101256206B (en) * | 2007-02-27 | 2011-07-20 | 上海市电力公司 | Method for measuring and recording mutation current of neutral point earthing resistor |
| CN103913655A (en) * | 2014-03-17 | 2014-07-09 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Direct-current common grounding electrode state monitoring system and state assessment method |
| CN103913655B (en) * | 2014-03-17 | 2015-12-30 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of direct current One Common Earthing Electrode condition monitoring system and state evaluating method |
| CN104653473A (en) * | 2014-06-13 | 2015-05-27 | 阮树成 | Solar power supply remote measure and control three-phase motor full automatic irrigation water pump |
| CN105044549A (en) * | 2015-04-14 | 2015-11-11 | 广西电网有限责任公司电力科学研究院 | Direct current grounding searching method with self compensation current |
| CN105044549B (en) * | 2015-04-14 | 2018-04-20 | 广西电网有限责任公司电力科学研究院 | A kind of direct current grounding trouble shooting method with self compensation electric current |
| CN110850330A (en) * | 2018-08-02 | 2020-02-28 | 半导体组件工业公司 | Ground fault interrupter self-test circuit and related method |
| CN110850330B (en) * | 2018-08-02 | 2024-05-10 | 半导体组件工业公司 | Ground fault interrupter self-checking circuit and related method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |