CN2447975Y - Dry-type hollow reactor protector - Google Patents
Dry-type hollow reactor protector Download PDFInfo
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- CN2447975Y CN2447975Y CN 00254501 CN00254501U CN2447975Y CN 2447975 Y CN2447975 Y CN 2447975Y CN 00254501 CN00254501 CN 00254501 CN 00254501 U CN00254501 U CN 00254501U CN 2447975 Y CN2447975 Y CN 2447975Y
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Abstract
The utility model relates to a dry-type hollow reactor protector, which comprises an overcurrent protection unit 1, an active power detection unit 2, a signal amplifying unit 3, a display unit 4, an external output port 5, an over limit decision unit 6, a switch relay 7, an alarm unit 8, and a switch power source 9. The device can timely and accurately warn or switch off the reactor switch for solving the short circuit of the reactor between the turn-to-turn and the fault of the flashover over the surface to cause the fault reactor to exit operation by the variation of the active power of the monitoring reactor. The whole device which takes a digital circuit as the basis, and has the advantages of low power consumption, high work stability of the circuit, high precision, simple repair, reliable operation and low cost.
Description
The utility model belongs to electric power system second protection field, is specifically related to a kind of dry-type air-core reactor protective device.
Dry-type air-core reactor is evenly distributed because of having starting voltage, the linearity good, the many at home and abroad fields of low noise advantages have obtained using widely, only just there is at present the reactor of ten hundreds of all kinds specifications moving at home, and still increases progressively in quantity with thousands of of every year.
Number is a huge class electric product so, ought to be effectively protected, and makes the reactor can be in time out of service when breaking down, and to prevent the expansion of accident, jeopardizes main transformer and intrasystem other facility.And actual conditions are the guard methods that generally lack at present a kind of effective reactor, especially lack the guard method when the serious shorted-turn fault of consequence occurring.Except that shunt reactor has been taked the certain protection measure,, do not take at present special safeguard measure (annotate: quantitatively, the reactor much less of other types such as series connection of shunt reactor, current limliting) for most reactors; And the guard method of shunt reactor is also also unreliable, even just has irrationality on principle.
Current protection situation at dry-type air-core reactor may be summarized as follows:
(1) dry type hollow shunt reactor
Method one: overcurrent protection.The overcurrent protection of widespread usage at present itself just exists unreliability in theory, this is to be sealed by the coiling in parallel of multilayer thin wire to form because of: dry-type air-core reactor, Theoretical Calculation as can be known, when a circle shorted-turn fault takes place in reactor, it is very little that the inductance value of shunt reactor changes, generally some thousandths of only; The multiturn shorted-turn fault also can not make the variation on the change generation order of magnitude of inductance value.Big variation can not take place because of the change of reactor inductance amount in the electric current that flows through reactor yet.That is to say that when reactor generation shorted-turn fault, protective device is impossible action.Overcurrent protection that Here it is is unsuitable for the main cause of dry type hollow reactor interturn short circuit fault protection.
Method two: double star outlet balanced balanced current protection.Be applied in some power station, but only be power Xuan Zhiji as the main protection mode of shunt reactor yet, most reactors do not take this kind protected mode that this problem also has been described from the side.This also is that special structure form by reactor is determined; for the different turn-to-turn short circuit positions and the short circuit number of turn; the sensitivity of neutral point unsymmetrical current reaction is different, in other words, can not in time move for some shorted-turn fault double star outlet balanced balanced current protection.The reactor accident proves that also above-mentioned two kinds of protected modes are not safe and reliable several times.
(2) reactor of dry-type hollow series reactor, dry type hollow current-limiting reactor, dry-type hollow filter reactor and other type does not all have special protected mode.
Along with the increase day by day of net capacity, to the raising day by day that power supply quality requires, the reactor product takes effective protected mode extremely urgent; And make a general survey of the domestic market, even worldwide, also there is not a kind of effective protected mode to use for reference or to adopt.
The purpose of this utility model provides a kind of dry-type air-core reactor protective device.
A kind of dry-type air-core reactor protective device; the signal that it is characterized in that voltage transformer pt is connected with the over-current protecting unit 1 that can carry out voltage input overcurrent protection; the signal of the output signal summation current transformer CT of over-current protecting unit 1 is connected with the active power detecting unit 2 that can carry out the active power detection respectively; the output of active power detecting unit 2 with can carry out voltage signal amplifying signal amplifying unit 3 and be connected; the display unit 4 that shows the active power size of reactor in real time is connected with signal amplification unit 3 through K switch 2; the external output port 5 of the active power data before and after the print fault in certain period is connected with signal amplification unit 3 through K switch 3; the out-of-limit identifying unit 6 of signal that the voltage signal size of input is judged is connected with signal amplification unit 3; reactor switch relay out of service 7 is connected through the out-of-limit identifying unit 6 of K switch 5 and signal, and Switching Power Supply 9 provides working power for device.The alarm unit 8 that can send buzzing or light warning signal is connected through the out-of-limit identifying unit 6 of K switch 4 and signal.
Threephase potential transformer PTa; PTb; the signal of PTc respectively with the over-current protecting unit 1-1 that can carry out voltage input overcurrent protection; 1-2; 1-3 connects; current transformer CTa; CTb; the signal of CTc and over-current protecting unit 1-1; 1-2; the output signal of 1-3 respectively with can carry out the active power detecting unit 2-1 that active power detects; 2-2; 2-3 connects; active power detecting unit 2-1; 2-2; the output voltage signal of 2-3 and the amplifying unit 3-1 that can carry out the voltage signal amplification; 3-2; 3-3 connects; the display unit 4-1 that shows the active power size of reactor in real time; 4-2; 4-3 is respectively through K switch 2a; K2b; K2c and signal amplification unit 3-1; 3-2; 3-3 connects; the external output port 5 of the active power data before and after the print fault in certain period is respectively through K switch 3a; K3b; K3c and signal amplification unit 3-1; 3-2; 3-3 connects; the out-of-limit identifying unit 6-1 of signal that judges of voltage signal size to input; 6-2; 6-3 respectively with signal amplification unit 3-1; 3-2; 3-3 connects, and can make reactor switch relay out of service 7 through K switch
5Be connected with the out-of-limit identifying unit 6 of signal, the alarm unit 8 that can send buzzing or light warning signal is through K switch
4Be connected with the out-of-limit identifying unit 6-1 of signal, 6-2,6-3, Switching Power Supply 9 provides power supply to device and through K switch
1Be connected with power supply.When system is that A, C are when being in series CT, in the inner V-arrangement mode of connection that adopts of device.
The utlity model has following advantage:
1. this device is by the variation of monitoring reactor active power, can be in time, exactly reactor interturn short circuit, edge flashing fault are warned or disconnected reactor switch, and make the fault reactor out of service.
2. this device current signal line adopts punching, and the original secondary connection of system is not had influence; Voltage input signal line series connection overcurrent protection is carried out fast tripping protection to installing the voltage signal line short circuit that self chance failure may cause; Power detecting unit is a Single Chip Microcomputer (SCM) system independently, as output variable, has high stability with direct voltage; The voltage signal amplifying unit amplifies the output voltage signal of power detecting unit, has further improved the antijamming capability of whole device; Final reactor condition judgement is finished in voltage off-limit alarm unit, can select with early warning signal and two kinds of way of outputs of switch actuating signals.
3. whole device is based on digital circuit, and is low in energy consumption, the job stability height of circuit, and the computational accuracy height, easy to maintenance, reliable, cost is low.
4. the variable power in certain period before and after the fault there is the memory storage function, can selects demonstration or printing dual mode to export.
Fig. 1 is the elementary diagram of shunt reactor protective device.
Fig. 2 is the elementary diagram of series reactor protective device.
Fig. 3 is the elementary diagram of current limliting reactor protection device.
Fig. 4 is the theory diagram of single-phase reactor protective device.
Fig. 5 is the theory diagram of three-phase reactor protective device.
Fig. 6 is a three-phase V-type wiring schematic diagram.
Embodiment 1:
Shown in Fig. 1,4; elementary diagram for the shunt reactor protective device; when three-phase in the system all has current transformer; device I is three road voltage signals and the input of three road current signals; each several part works alone, and common switch power supply 9 and alarm unit 8 are when device is three road voltage signals and the input of two-way current signal; A, C work alone mutually, and the current signal of B phase obtains from A, C two-phase through the V-arrangement wiring.
The function of the each several part of device is as follows:
Voltage input over-current protecting unit 1-1,1-2,1-3: be connected in the voltage signal line, self break down may cause PT secondary line short circuit the time at device, fusing in time makes device and the disengaging of whole electrical secondary system.This over-current protecting unit is commercially available fusible link.
Active power detecting unit 2-l, 2-2,2-3: the active power to reactor is monitored, and the active power of reactor is converted into direct voltage output.When shorted-turn fault appears in reactor, the closed circuit of reactor high-intensity magnetic field must appear surrounding, be equivalent to the increase of the D.C. resistance of reactor, the active power of reactor (loss) increases thereupon, and the output voltage of active power detecting unit also increases thereupon.This active power detecting unit is commercially available active power transducer, and model is P412S1.
Signal amplification unit 3-l, 3-2,3-3: the output voltage signal of active power detecting unit is carried out a certain proportion of amplification, be convenient to the judgement of the out-of-limit identifying unit of follow-up signal, improved the antijamming capability of system.This unit is commercially available direct current and pulsating dc voltage isolation sensor, and model is V342S1.
Display unit 4: the switching by K switch 2a, K2b, K2c shows the size of voltage of the active power correspondence of reactor in real time, is convenient to intuitively observe the running status of reactor.
External output port 5: by the voltage data of the active power correspondence in certain period before and after the switching print fault of K switch 3a, K3b, K3c.
The out-of-limit identifying unit 6 of signal: the voltage signal size to input is judged, sends actuation of an alarm or switch actuating signals after voltage signal surmounts set point.This unit is commercially available voltage off-limit alarm isolation sensor, and model is KV112S1.
Switch relay 7: after receiving the actuating signal of the out-of-limit identifying unit of signal, send switch actuating signals, make the switch relay action, reactor is out of service.
Alarm unit 8: after receiving the actuating signal of the out-of-limit identifying unit of signal, send buzzer or light warning signal.
Switching Power Supply 9: for device provides working power.
Device has the work of some switches with adapting device, and the function of each switch is as follows:
(1) K switch 1: battery main switch.
(2) K switch 2, K2a, K2b, K2c: select display switch.
(3) K switch 3, K3a, K3b, K3c: select the output switch.
(4) K switch 4: alarm unit switch, switch closure in the time of need being operated in alarm condition.
(5) K switch 5: switching signal output switch, switch closure in the time of need being operated in the switching signal output state.
The concrete grammar of realizing the dry-type air-core reactor error protection is:
1. get reactor terminal voltage and the current signal that flows through reactor from original bus bar side voltage transformer pt of the system that reactor is housed and reactor porch current transformer CT;
2. the voltage of obtaining, current signal calculate effective value U, the I of the time difference Δ t of sine wave signal zero crossing and voltage, electric current through sampling, by the single-chip microcomputer internal program time difference Δ t of sine wave signal zero crossing is converted into reactor impedance angle α=Δ t * 2 π/0.02, can obtain the active power P=UIcos α of reactor, single-chip microcomputer is converted to direct voltage U with active power P
1Export this voltage signal U
1After linearity is amplified, obtain linear voltage signal U with reactor active power P
2And show;
3. when reactor generation shorted-turn fault, must form the closed circuit that surrounds the reactor high-intensity magnetic field, the active power of reactor must increase thereupon, for general reactor structure, when a circle short trouble takes place when, the active power of reactor is designated as P ' at K=2 times at least more than the normal value, the voltage signal of output also is linear increasing and is designated as U
1', this voltage signal U
1' after linearity is amplified, obtain linear voltage signal U with reactor active power P '
2', this voltage signal U
2' with the out-of-limit decision content U of voltage
FRelatively;
4. as voltage signal U
2' above the out-of-limit decision content U of voltage
FThe time, the action of switch control relay, reactor is out of service;
5. can select as required to show or print fault record result.
The using method and the operating procedure of this device are as follows:
This device is used for system's dry-type air-core reactor fault pre-alarming and protections such as electric power, metallurgy, railway.Obtain the terminal voltage of reactor and flow through the current signal of reactor by voltage transformer pt, current transformer CT, voltage transformer pt, current transformer CT holding wire and device input port link to each other.The intact back of wiring opening power is pressed operating switch K
1, this moment, device was in running order, and the device surface panel display will show the active power corresponding voltage value of reactor, with the A on the panel, B, C phase selector switch K
2a, K
2b, K
2c, K
3a, K
3b, K
3cThe reactor phase sequence of selecting desire to observe.According to PT, the CT configuration of reactor place system, can adjust the gear of input port, to improve the precision of test.The size of the active power corresponding voltage value that shows according to display doubling this value as the out-of-limit benchmark of power, and is stored.In the course of work of installing, continue to detect and write down the voltage data of the active power correspondence of reactor, can select demonstration and printing dual mode to export.
Embodiment 2:
Shown in Fig. 2,4; elementary diagram for the series reactor protective device; when three-phase in the system all has current transformer; device I is three road voltage signals and the input of three road current signals, and each several part works alone, common switch power supply 9 and alarm unit 8; when device is three road voltage signals and the input of two-way current signal; A, C work alone mutually, and the current signal of B phase obtains from A, C two-phase through the V-arrangement wiring, as shown in Figure 6.
Because the loss of shunt capacitor self is extremely low, make supporting with it series reactor active power near the measured value P that installs, when device work, do not consider its loss.Other is identical with embodiment 1.
Embodiment 3:
Shown in Fig. 3,4; elementary diagram for current limliting reactor protection device; current limiting reactor is installed in series in system; when three-phase in the system all has current transformer; device is the inputs of three road current signals; when device was imported for the two-way current signal, A, C worked alone mutually, and the current signal of B phase obtains as shown in Figure 6 from A, C two-phase through the V-arrangement wiring.Its voltage signal U is by obtaining on the voltage transformer pt that is connected in parallel on A, B, C three-phase reactor two ends.Other is identical with embodiment 1.
Claims (4)
1. dry-type air-core reactor protective device; the signal that it is characterized in that voltage transformer pt is connected with the over-current protecting unit (1) that can carry out voltage input overcurrent protection; the signal of the output signal summation current transformer CT of over-current protecting unit (1) is connected with the active power detecting unit (2) that can carry out the active power detection respectively; the output of active power detecting unit (2) with can carry out voltage signal amplifying signal amplifying unit (3) and be connected; the display unit (4) that shows the active power size of reactor in real time is connected with signal amplification unit (3) through switch (K2); the external output port (5) of the active power data before and after the print fault in certain period is connected with signal amplification unit (3) through switch (K3); the out-of-limit identifying unit of signal (6) that the voltage signal size of input is judged is connected with signal amplification unit (3); reactor switch relay out of service (7) is connected with the out-of-limit identifying unit of signal (6) through switch (K5), and Switching Power Supply (9) provides working power for device.
2. device according to claim 1 is characterized in that the alarm unit (8) that can send buzzing or light warning signal is connected with the out-of-limit identifying unit of signal (6) through switch (K4).
3. device according to claim 1 and 2; it is characterized in that threephase potential transformer PTa; PTb; the signal of PTc respectively with the over-current protecting unit (1-1 that can carry out voltage input overcurrent protection; 1-2; 1-3) connect; current transformer CTa; CTb; the signal of CTc and over-current protecting unit (1-1; 1-2; output signal 1-3) respectively with can carry out the active power detecting unit (2-1 that active power detects; 2-2; 2-3) connect; active power detecting unit (2-1; 2-2; output voltage signal 2-3) with can carry out voltage signal amplifying signal amplifying unit (3-1; 3-2; 3-3) connect; display unit (the 4-1 that shows the active power size of reactor in real time; 4-2; 4-3) respectively through switch (K2a; K2b; K2c) with signal amplification unit (3-1; 3-2; 3-3) connect; the external output port (5) of the active power data before and after the print fault in certain period is respectively through switch (K3a; K3b; K3c) with signal amplification unit (3-1; 3-2; 3-3) connect; the out-of-limit identifying unit (6-1 of signal that judges of voltage signal size to input; 6-2; 6-3) respectively with signal amplification unit (3-1; 3-2; 3-3) connect, can make reactor switch relay out of service (7) through switch (K
5) be connected with the out-of-limit identifying unit of signal (6), the alarm unit (8) that can send buzzing or light warning signal is through switch (K
4) be connected with the out-of-limit identifying unit of signal (6-1,6-2,6-3), Switching Power Supply (9) provides power supply to device and through switch (K
1) be connected with power supply.
4. device according to claim 3, it is characterized in that when system be that A, C are when being in series CT, in the inner V-arrangement mode of connection that adopts of device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00254501 CN2447975Y (en) | 2000-09-15 | 2000-09-15 | Dry-type hollow reactor protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00254501 CN2447975Y (en) | 2000-09-15 | 2000-09-15 | Dry-type hollow reactor protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2447975Y true CN2447975Y (en) | 2001-09-12 |
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ID=33611739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00254501 Expired - Fee Related CN2447975Y (en) | 2000-09-15 | 2000-09-15 | Dry-type hollow reactor protector |
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| Country | Link |
|---|---|
| CN (1) | CN2447975Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100433484C (en) * | 2005-01-08 | 2008-11-12 | 石家庄铁路分局邯郸供电段 | Dry hollow reactor early warning protector |
| CN106990305A (en) * | 2017-04-13 | 2017-07-28 | 山东汇能电气有限公司 | The dry-type air-core reactor on-line monitoring method of high-voltage power capacitor complexes |
| CN108761297A (en) * | 2018-08-28 | 2018-11-06 | 重庆理工大学 | A kind of dry-type air-core reactor partial discharges fault on-line computing model based on high-frequency signal |
| CN110581532A (en) * | 2019-09-20 | 2019-12-17 | 江苏龙洋电力设备有限公司 | Transformer turn-to-turn short circuit detector adopting voltage difference |
-
2000
- 2000-09-15 CN CN 00254501 patent/CN2447975Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100433484C (en) * | 2005-01-08 | 2008-11-12 | 石家庄铁路分局邯郸供电段 | Dry hollow reactor early warning protector |
| CN106990305A (en) * | 2017-04-13 | 2017-07-28 | 山东汇能电气有限公司 | The dry-type air-core reactor on-line monitoring method of high-voltage power capacitor complexes |
| CN108761297A (en) * | 2018-08-28 | 2018-11-06 | 重庆理工大学 | A kind of dry-type air-core reactor partial discharges fault on-line computing model based on high-frequency signal |
| CN108761297B (en) * | 2018-08-28 | 2024-05-10 | 重庆理工大学 | Dry-type air-core reactor partial discharge fault on-line monitoring appearance based on high frequency signal |
| CN110581532A (en) * | 2019-09-20 | 2019-12-17 | 江苏龙洋电力设备有限公司 | Transformer turn-to-turn short circuit detector adopting voltage difference |
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| 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 |