CN203574379U - Segregated-phase synchronized switching control device - Google Patents
Segregated-phase synchronized switching control device Download PDFInfo
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- CN203574379U CN203574379U CN201320666260.3U CN201320666260U CN203574379U CN 203574379 U CN203574379 U CN 203574379U CN 201320666260 U CN201320666260 U CN 201320666260U CN 203574379 U CN203574379 U CN 203574379U
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- 230000009471 action Effects 0.000 claims description 36
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- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The utility model relates to a segregated-phase synchronized switching control device which comprises the components of: a vacuum permanent-magnet circuit breaker, a current transformer set, a reactor set, a capacitor set, an electric network voltage synchronous signal detector, an AB phase switching on/off coil driver, an AB phase operating unit, a C phase switching on/off coil driver and a C phase operating unit. The segregated-phase synchronized switching control device provided by the utility model effectively controls switching inrush current and opening overvoltage through switching a capacitor set at a reference voltage zero-crossing point of the electric network. The segregated-phase synchronized switching control device can prevent larger switching inrush current and opening overvoltage generated in using a traditional three-phase circuit breaker or a three-phase vacuum contactor for switching the capacitor set.
Description
Technical Field
The utility model relates to a reactive automatic compensation field of synthesizing of transformer substation's voltage, concretely relates to switching control device.
Background
The capacitor is used as an important reactive device and widely applied to voltage regulation and power factor regulation of a power system, line loss reduction and harmonic filtering. At present, a three-phase circuit breaker or a three-phase vacuum contactor is often used as an operation switch for switching a capacitor bank, and the switching mode of the capacitor bank is inevitable to generate large inrush current and overvoltage when a capacitor is switched on. In recent years, with the application of a large number of power electronic devices, users have made higher requirements on the quality of electric energy, and it has been found that the overvoltage generated when a capacitor bank is put into a system can cause the false tripping of some speed regulation driving devices. Meanwhile, the inrush current is easy to damage capacitors, switching devices and the like, and the safety operation of power equipment can be threatened in severe cases. The transient process of the capacitor during the operation has attracted more and more attention.
The hazards that the inrush current will cause are as follows:
(1) cause damage of the switching switch
The switching-on current rises sharply, and when the switching-on current is serious, a large current is generated, and in addition, the oscillation frequency is high, so that large mechanical stress and vibration are generated in the switch, and the contact of the fling-cut switch is welded and burnt.
(2) Cause damage of the capacitor
The actual measurement data shows that: the closing inrush current of the capacitor is 4-15 times of the rated current of the capacitor, the oscillation frequency is 250-400Hz, and the overvoltage generated by the closing of the capacitor is about 2-3 times of the phase voltage.
(3) The electric power generated by the inrush current may damage other parts and may cause insulation damage to the series reactor.
The switching-on and switching-off capacitor bank of the transformer substation generally adopts a circuit breaker or a vacuum contactor of a traditional spring operation structure, the switching-on and switching-off actions of the switching-on and switching-off capacitor bank completely depend on mechanical transmission, the total number of parts is large, the number of transmission and rotating parts is large, mechanical abrasion exists in multiple switching-off actions, the switching-on and switching-off action interval time is long, the service life is short, and the requirement of frequent switching-on and switching-off of the capacitor bank.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a divide same step and throw off controlling means, it can overcome and produce too big combined floodgate inrush current and separating brake overvoltage when adopting three-phase circuit breaker or three-phase vacuum contactor switching capacitor bank to avoid the harm of the system equipment who brings from this.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the split-phase synchronous switching control device comprises a vacuum permanent magnet circuit breaker, a current transformer group, a reactor group, a capacitor group, a power grid voltage synchronous signal detector, an AB phase split-gate coil driver, an AB phase operation unit, a C phase split-gate coil driver and a C phase operation unit, wherein the power grid voltage synchronous signal detector is used for obtaining switching time for delaying sending switching pulses at the position of a zero crossing point according to the zero crossing point of reference voltage of a power grid and the fixed action time of the vacuum permanent magnet circuit breaker; the power grid, the vacuum permanent magnet circuit breaker, the current transformer group, the reactor group and the capacitor group are sequentially connected in series; the power grid voltage synchronous signal detector is connected with a power grid; wherein,
the power grid voltage synchronous signal detector is used for receiving a zero-crossing switching signal and outputting a driving signal at the switching time;
the AB phase opening and closing coil driver is used for receiving a driving signal and outputting an AB phase switching pulse;
the AB phase operation unit is used for receiving AB phase switching pulses and driving an A phase action coil and a B phase action coil of the vacuum permanent magnet circuit breaker;
the C-phase switching-off and switching-on coil driver is used for receiving a driving signal and outputting a C-phase switching pulse;
and the C-phase operation unit is used for receiving the C-phase switching pulse and driving a C-phase action coil of the vacuum permanent magnet circuit breaker.
Preferably, the split-phase synchronous switching control device further comprises a capacitor bank relay protection detector; the capacitor bank relay protection detector is used for receiving a current signal collected by the current transformer bank and a reference voltage signal collected by the power grid voltage synchronous signal detector, comparing the current signal with a preset current threshold value, comparing the reference voltage signal with a preset voltage threshold value, and outputting a brake-separating signal if the current signal is greater than or equal to the current threshold value or the reference voltage signal is greater than or equal to the voltage threshold value; the AB phase opening and closing coil driver is also used for receiving opening signals and outputting AB phase opening and closing pulses; the AB phase operation unit is also used for receiving AB phase switching-off pulses and driving an A phase action coil and a B phase action coil of the vacuum permanent magnet circuit breaker; the C-phase opening and closing coil driver is also used for receiving opening signals and outputting C-phase opening and closing pulses; and the C-phase operation unit is also used for receiving the C-phase switching-off pulse and driving a C-phase action coil of the vacuum permanent magnet circuit breaker.
The utility model discloses following beneficial effect has:
the switching-on inrush current and the switching-off overvoltage are effectively controlled by switching the capacitor bank at the zero crossing point of the reference voltage of the power grid. Produce great combined floodgate inrush current and separating brake overvoltage when using three-phase circuit breaker or three-phase vacuum contactor switching capacitor bank for the tradition, the utility model discloses have good control action to the two, protected various equipment in the electric system from this.
Drawings
Fig. 1 is a schematic structural diagram of a split-phase synchronous switching control device according to a preferred embodiment of the present invention;
fig. 2 is a schematic diagram of switching time.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the embodiments.
As shown in fig. 1, a synchronous switching control device includes a vacuum permanent magnet circuit breaker ISM, a current transformer group, a reactor group, a capacitor group, a grid voltage synchronous signal detector for obtaining a switching time of delaying the switching pulse at a zero-crossing point position according to a zero-crossing point of a reference voltage of a grid and a fixed action time of the vacuum permanent magnet circuit breaker ISM, an AB phase switching coil driver, an AB phase operation unit CM-AB, a C phase switching coil driver, a C phase operation unit CM-C, and a capacitor group relay protection detector. The power grid, the vacuum permanent magnet circuit breaker, the current transformer group, the reactor group and the capacitor group are sequentially connected in series; the grid voltage synchronous signal detector is connected with a grid. The power grid has A, B, C phases, so the current transformer group, the reactor group and the capacitor group have three respectively and are connected to three phases respectively, which is the same as the prior art and is not described again.
The power grid voltage synchronous signal detector is used for receiving a zero-crossing switching signal and outputting a driving signal at the switching time;
the AB phase opening and closing coil driver is used for receiving a driving signal and outputting an AB phase switching pulse;
the AB phase operation unit is used for receiving AB phase switching pulses and driving an A phase action coil and a B phase action coil of the vacuum permanent magnet circuit breaker;
the C-phase switching-off and switching-on coil driver is used for receiving a driving signal and outputting a C-phase switching pulse;
and the C-phase operation unit is used for receiving the C-phase switching pulse and driving a C-phase action coil of the vacuum permanent magnet circuit breaker.
The capacitor bank relay protection detector is used for receiving a current signal collected by the current transformer bank and a reference voltage signal collected by the power grid voltage synchronous signal detector, comparing the current signal with a preset current threshold value, comparing the reference voltage signal with a preset voltage threshold value, and outputting a brake-separating signal if the current signal is greater than or equal to the current threshold value or the reference voltage signal is greater than or equal to the voltage threshold value; the AB phase opening and closing coil driver is also used for receiving opening signals and outputting AB phase opening and closing pulses; the AB phase operation unit is also used for receiving AB phase switching-off pulses and driving an A phase action coil and a B phase action coil of the vacuum permanent magnet circuit breaker; the C-phase opening and closing coil driver is also used for receiving opening signals and outputting C-phase opening and closing pulses; and the C-phase operation unit is also used for receiving the C-phase switching-off pulse and driving a C-phase action coil of the vacuum permanent magnet circuit breaker.
As shown in fig. 2, the switching time is explained as follows:
the point A is any switching command sending point; the point B is a reference voltage zero crossing point judged by the power grid voltage synchronous signal detector after sending out the zero-crossing switching signal; the point C is a switching pulse sending point, and the vacuum permanent magnet circuit breaker starts to act after receiving the switching pulse; and point D is the action end point of the vacuum permanent magnet circuit breaker, and the time period CD is the inherent action time of the vacuum permanent magnet circuit breaker. The vacuum permanent magnet circuit breaker is required to act at the zero crossing point of the reference voltage, namely, the D point. The time period BC plus the time period CD must be equal to an integer multiple of a half-wave of the sine wave of the reference voltage. As shown in fig. 2, the half-wave time must be obtained by subtracting the time period CD from the half-wave time generation, plus the time period BC. According to analysis, the time period BC is the time for delaying the switching pulse from the zero crossing point of the power grid voltage synchronous signal detector, namely the optimal time for the zero crossing switching of the vacuum permanent magnet circuit breaker. The inherent time period CD and the reference voltage frequency of the vacuum permanent magnet circuit breaker can be calculated by a power grid voltage synchronous signal detector.
The working process of the embodiment is as follows:
the vacuum permanent magnet circuit breaker ISM is connected to the grid A, B, C at one end and to the current transformer bank at the other end, and is connected in series with the reactor bank and the capacitor bank. The power grid adopts A, B, C three-phase voltage into a power grid voltage synchronous signal detector through a voltage transformer group (not shown), the line voltage Uab is used as reference voltage input into the power grid voltage synchronous signal detector, the power grid voltage synchronous signal detector judges the zero crossing point of the reference voltage, and the time for the power grid voltage synchronous signal detector to delay and send out switching pulse, namely the optimal time for switching the capacitor group at the zero crossing point is calculated according to the fixed action time of the vacuum permanent magnet circuit breaker measured during initialization. The actuating coils KA and KB of the vacuum permanent magnet circuit breaker ISM-A, ISM-B phase knife switch contact are connected in parallel and controlled by an AB phase operating unit CM-AB through a transistor switching device, and the auxiliary contacts QFA and QFB after the AB phase knife switch acts are connected in series to reflect the action condition of the AB phase knife switch contact and feed back to the AB phase operating unit CM-AB. And an action coil KC of the ISM-C phase disconnecting link contact is controlled by a transistor switching device of the C phase operation unit CM-C, and an auxiliary contact QFC after the C phase disconnecting link acts reflects the action condition of the C phase disconnecting link contact and feeds back to the C phase operation unit CM-C. After the power grid voltage synchronous signal detector receives the zero-crossing switching signal, the AB phase opening and closing coil driver sends out switching pulses according to the delay zero sending time of the power grid voltage synchronous signal detector, and the AB phase operation unit CM-AB acts on AB phase action coils KA and KB of the vacuum permanent magnet circuit breaker ISM after receiving the pulses; the C-phase opening and closing coil driver sends switching pulses according to the time of the delay zero point of the power grid voltage synchronous signal detector, and the C-phase operation unit CM-C acts on a C-phase action coil KC of the vacuum permanent magnet circuit breaker ISM after receiving the pulses. The vacuum permanent magnet circuit breaker completes zero-crossing action and switches the capacitor bank. The current transformer group samples the current of the power grid, and the sampled current and the sampled reference voltage are used as the action basis of the relay protection detector of the capacitor group. The capacitor bank relay protection detector monitors and protects the running capacitor bank according to the acquired current and voltage of the power grid and preset current and voltage protection fixed values. After the current or voltage value detected in real time reaches or exceeds a preset setting value, the AB phase opening and closing coil driver and the C phase opening and closing coil driver do not send delay opening and closing pulses, but send opening and closing pulses to act on the action coils KA, KB and KC of the vacuum permanent magnet circuit breaker ISM, and the three-phase switch outlets of the ISM-A, ISM-B, ISM-C act simultaneously, so that the effect of timely removing faults is achieved.
The operation sequence of the capacitor bank of the present embodiment is explained as follows:
in a medium-voltage system, the parallel capacitor bank is often connected in a star connection mode with a neutral point not grounded, and the capacitor input sequence is as follows: when the difference Uab between the two-phase voltages is 0, the A, B two-phase compensation capacitor bank is simultaneously charged, and the C-phase voltage Uc passes through 90o(5 ms in a 50Hz system) will be zero, which is also the time at which the C-phase capacitor bank is switched in. Similarly, the capacitor is cut in the following sequence: when the C-phase voltage Uc is the maximum value, the capacitor bank of the C-phase is cut off, the voltage difference Uab of the two phases is 0 at the moment, and 90 is passedoAnd then will become maximum, which is also the time at which the A, B two-phase capacitor bank is cut off.
According to the embodiment, the zero crossing point of the reference voltage is accurately detected, the switching command sending time is intelligently corrected according to the inherent delay characteristic of the vacuum permanent magnet circuit breaker, the accurate zero crossing switching of the capacitor bank is ensured, and the error time is controlled within 1 ms. The switching-on surge current and the switching-off overvoltage generated by the switched capacitor bank are controlled within 2 times.
The vacuum permanent magnet circuit breaker comprehensively realizes good matching of the spring operating mechanism and the magnetic operating mechanism with the vacuum arc-extinguishing chamber through electromagnetic switching-on, permanent magnet keeping and spring switching-off, has excellent mechanical and electrical characteristics and can be operated frequently; the three-phase independent operation can be adopted, the dispersion of the switching-on and switching-off time is small, and the switching-on and switching-off can be effectively finished by effectively ensuring the internal reference voltage zero crossing point of a reasonable error in cooperation with the split-phase synchronous switching controller.
Various other changes and modifications may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such changes and modifications should fall within the scope of the present invention.
Claims (2)
1. The split-phase synchronous switching control device is characterized by comprising a vacuum permanent magnet circuit breaker, a current transformer group, a reactor group, a capacitor group, a power grid voltage synchronous signal detector, an AB phase split-gate coil driver, an AB phase operation unit, a C phase split-gate coil driver and a C phase operation unit, wherein the power grid voltage synchronous signal detector is used for obtaining switching time for delaying sending switching pulses at the position of a zero crossing point according to the zero crossing point of reference voltage of a power grid and the fixed action time of the vacuum permanent magnet circuit breaker; the power grid, the vacuum permanent magnet circuit breaker, the current transformer group, the reactor group and the capacitor group are sequentially connected in series; the power grid voltage synchronous signal detector is connected with a power grid; wherein,
the power grid voltage synchronous signal detector is used for receiving a zero-crossing switching signal and outputting a driving signal at the switching time;
the AB phase opening and closing coil driver is used for receiving a driving signal and outputting an AB phase switching pulse;
the AB phase operation unit is used for receiving AB phase switching pulses and driving an A phase action coil and a B phase action coil of the vacuum permanent magnet circuit breaker;
the C-phase switching-off and switching-on coil driver is used for receiving a driving signal and outputting a C-phase switching pulse;
and the C-phase operation unit is used for receiving the C-phase switching pulse and driving a C-phase action coil of the vacuum permanent magnet circuit breaker.
2. The split-phase synchronous switching control device according to claim 1, further comprising a capacitor bank relay protection detector; the capacitor bank relay protection detector is used for receiving a current signal collected by the current transformer bank and a reference voltage signal collected by the power grid voltage synchronous signal detector, comparing the current signal with a preset current threshold value, comparing the reference voltage signal with a preset voltage threshold value, and outputting a brake-separating signal if the current signal is greater than or equal to the current threshold value or the reference voltage signal is greater than or equal to the voltage threshold value; the AB phase opening and closing coil driver is also used for receiving opening signals and outputting AB phase opening and closing pulses; the AB phase operation unit is also used for receiving AB phase switching-off pulses and driving an A phase action coil and a B phase action coil of the vacuum permanent magnet circuit breaker; the C-phase opening and closing coil driver is also used for receiving opening signals and outputting C-phase opening and closing pulses; and the C-phase operation unit is also used for receiving the C-phase switching-off pulse and driving a C-phase action coil of the vacuum permanent magnet circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320666260.3U CN203574379U (en) | 2013-10-24 | 2013-10-24 | Segregated-phase synchronized switching control device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320666260.3U CN203574379U (en) | 2013-10-24 | 2013-10-24 | Segregated-phase synchronized switching control device |
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| CN203574379U true CN203574379U (en) | 2014-04-30 |
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| CN201320666260.3U Expired - Fee Related CN203574379U (en) | 2013-10-24 | 2013-10-24 | Segregated-phase synchronized switching control device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105304418A (en) * | 2015-09-10 | 2016-02-03 | 陕西宝鼎开关有限公司 | Special main and auxiliary circuit breaker for test station |
| CN111799113A (en) * | 2020-06-09 | 2020-10-20 | 国网山东省电力公司检修公司 | Intelligent phase selection control system and method with function database storage function |
| CN111799112A (en) * | 2020-06-09 | 2020-10-20 | 国网山东省电力公司检修公司 | Intelligent phase selection control system and method with dynamic self-adaptive function |
| CN117410129A (en) * | 2023-10-26 | 2024-01-16 | 武汉大学 | Accurate phase control closing device of parallel compensation capacitor bank based on fast switch |
-
2013
- 2013-10-24 CN CN201320666260.3U patent/CN203574379U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105304418A (en) * | 2015-09-10 | 2016-02-03 | 陕西宝鼎开关有限公司 | Special main and auxiliary circuit breaker for test station |
| CN111799113A (en) * | 2020-06-09 | 2020-10-20 | 国网山东省电力公司检修公司 | Intelligent phase selection control system and method with function database storage function |
| CN111799112A (en) * | 2020-06-09 | 2020-10-20 | 国网山东省电力公司检修公司 | Intelligent phase selection control system and method with dynamic self-adaptive function |
| CN117410129A (en) * | 2023-10-26 | 2024-01-16 | 武汉大学 | Accurate phase control closing device of parallel compensation capacitor bank based on fast switch |
| CN117410129B (en) * | 2023-10-26 | 2024-07-09 | 武汉大学 | Accurate phase control closing device of parallel compensation capacitor bank based on fast switch |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140430 Termination date: 20211024 |
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| CF01 | Termination of patent right due to non-payment of annual fee |