A kind of anti-ferroresonance self-powered 2PT phase three-wire three electronic mutual inductor proportioning device of high voltage electric energy or batch meter
[technical field]
The present invention relates to the Electric Energy Metering Technology field of power distribution network observing and controlling, specifically the self-powered 2PT phase three-wire three of anti-ferroresonance electronic mutual inductor proportioning device of high voltage electric energy or batch meter.
[background technology]
Used 2PT phase three-wire three proportioning device of high voltage electric energy, batch meter adopt electromagnetic potential transformer to obtain voltage signal mostly, electromagnetic potential transformer easily and electrical network generation ferroresonance, cause high-voltage insurance fusing, even cause voltage transformer (VT) blast, jeopardize power grid security, therefore, become a large technical barrier of proportioning device of high voltage electric energy, batch meter.Though electronic type voltage transformer is difficult for and electrical network generation ferroresonance, output power signal is very little, now generally adopts external low-tension supply to provide working power for secondary electron instrument and meters such as its secondary singal translation circuit and electric energy meters.But if proportioning device of high voltage electric energy, batch meter adopt external low-tension supply to provide working power for electric energy meter, the reliability of electric energy metrical can be subject to the impact of external power supply, is unfavorable for anti-electricity-theft.Though there is employing separately to connect electromagnetic potential transformer power supply, without external low-tension supply, but do not take the magnetically saturated problem of anti-electromagnetic potential transformer, the electromagnetic potential transformer that solves power supply easily and electrical network generation ferroresonance, cause high-voltage insurance fusing, even cause the blast of supply voltage mutual inductor, jeopardize the problems such as power grid security.
[summary of the invention]
The present invention has overcome the deficiency of above-mentioned technology, provides a kind of and can not produce excessive resonance current, reaches 2PT phase three-wire three proportioning device of high voltage electric energy or the batch meter of the object of anti-ferroresonance.
For achieving the above object, the present invention has adopted following technical proposal:
A kind of anti-ferroresonance self-powered 2PT phase three-wire three electronic mutual inductor proportioning device of high voltage electric energy or batch meter, comprise 2 groups of anti-ferroresonance self-power supply devices of electronic combined mutual inductor and 1 electronic electric energy meter, the anti-ferroresonance self-power supply device of electronic combined mutual inductor comprises electronic type voltage transformer, damping resistance, energy supply transformer, isolating transformer, rectification filtering voltage stabilizing circuit, electronic current mutual inductor, and the primary winding of described energy supply transformer is connected in parallel on electronic type voltage transformer two ends once after having one end series damping resistor at least; The secondary coil of described energy supply transformer connects described isolating transformer, rectification filtering voltage stabilizing circuit described in the secondary of isolating transformer output termination, and the output termination secondary voltage signal conversion circuit of rectification filtering voltage stabilizing circuit also provides working power for it; The secondary voltage signal output part of described electronic type voltage transformer is connected with secondary voltage signal conversion circuit input end, the secondary voltage signal after the secondary voltage signal of electronic type voltage transformer output is converted by secondary voltage signal conversion circuit after output transform; Another bus of another termination of termination bus of the primary winding of electronic type voltage transformer, the secondary current signal output part connecting secondary current signal translation circuit of electronic current mutual inductor, the secondary current signal after the secondary current signal of electronic current mutual inductor output is converted by secondary current signal conversion circuit after output transform; Described rectification filtering voltage stabilizing circuit is also connected with secondary current signal conversion circuit and for it provides working power, described rectification filtering voltage stabilizing circuit, secondary voltage signal conversion circuit, secondary current signal conversion circuit connect respectively electronic electric energy meter;
One termination A phase bus of the primary winding of the electronic type voltage transformer of one group of anti-ferroresonance self-power supply device of electronic combined mutual inductor, another termination B phase bus of the primary winding of this electronic type voltage transformer, once the connecting with A phase bus of the electronic current mutual inductor of this group electronic combined mutual inductor anti-ferroresonance self-power supply device;
One termination C phase bus of the primary winding of the electronic type voltage transformer of the anti-ferroresonance self-power supply device of another group electronic combined mutual inductor, another termination B phase bus of the primary winding of this electronic type voltage transformer, once the connecting with C phase bus of the electronic current mutual inductor of this group electronic combined mutual inductor anti-ferroresonance self-power supply device.
Described damping resistance adopts linear resistance, and the primary winding of described energy supply transformer is connected in parallel on electronic type voltage transformer two ends once after having one end series connection linear resistance at least.
Described damping resistance adopts posistor, and the primary winding of described energy supply transformer is connected in parallel on electronic type voltage transformer two ends once after having one end series connection posistor at least.
Described damping resistance adopts the resistance in series of posistor and linear resistance composition, and the primary winding of described energy supply transformer has at least one end to connect after described resistance in series to be connected in parallel on electronic type voltage transformer two ends once.
Described damping resistance adopts the parallel resistance of posistor and linear resistance composition, and the primary winding of described energy supply transformer has at least one end to connect after described parallel resistance to be connected in parallel on electronic type voltage transformer two ends once.
The invention has the beneficial effects as follows:
1, on energy supply transformer primary winding after series damping resistor, when occurring to close a floodgate suddenly or during capacitor discharge, because damping resistance is larger, charging current greatly reduces, iron core is difficult for saturated, and the figure of merit value in loop reduces greatly, gets and can not produce excessive resonance current by branch road; Utilize electronic type voltage transformer to be difficult for the feature with electrical network generation ferroresonance, by it, get voltage signal, again can self-powered thereby reach the voltage signal that can not only obtain power distribution network, and the object of the anti-ferroresonance of whole device, improved safety and reliability and the anti-electricity-theft performance of whole device.
2, because the present invention will get voltage signal and power taking can be placed on same position, be divided into again two different branch roads and transmit output, so can branch road series connection above not affect the accuracy of voltage signal compared with large resistance because getting, although can affect the internal resistance of self powered supply, but the working power providing due to need is direct current, and power demand is generally not very big, can be easy to solve by mu balanced circuit, thereby can realize both anti-ferroresonances, without external working power, even can accomplish with existing electromagnetic transformer completely compatible again.
3, damping resistance of the present invention, different compositions also has different separately beneficial effects.Adopt linear resistance to form simple; Adopt posistor, when resonance current increases, temperature raises, and resistance increases, and can strengthen the ability that suppresses resonance current; Adopt posistor to connect with linear resistance or the posistor temperature characterisitic that can improve damping resistance in parallel with linear resistance.
[accompanying drawing explanation]
Fig. 1 does not have the equivalent resonant tank circuit schematic diagram of series damping resistor on winding of energy supply transformer;
Fig. 2 is in series with the circuit theory diagrams of the equivalent resonant tank of damping resistance R on winding of energy supply transformer;
Fig. 3 is that damping resistance adopts the self-powered 2PT phase three-wire three of the anti-ferroresonance electronic mutual inductor proportioning device of high voltage electric energy of linear resistance or the schematic diagram of batch meter;
Fig. 4 is that damping resistance adopts the self-powered 2PT phase three-wire three of the anti-ferroresonance electronic mutual inductor proportioning device of high voltage electric energy of posistor or the schematic diagram of batch meter;
Fig. 5 is that damping resistance adopts posistor and the self-powered 2PT phase three-wire three of the anti-ferroresonance electronic mutual inductor proportioning device of high voltage electric energy of linear resistance resistance in series or the schematic diagram of batch meter;
Fig. 6 is that damping resistance adopts posistor and the self-powered 2PT phase three-wire three of the anti-ferroresonance electronic mutual inductor proportioning device of high voltage electric energy of linear resistance parallel resistance or the schematic diagram of batch meter.
[embodiment]
A kind of anti-ferroresonance self-powered 2PT phase three-wire three electronic mutual inductor proportioning device of high voltage electric energy or batch meter, comprise 2 groups of anti-ferroresonance self-power supply devices of electronic combined mutual inductor and 1 electronic electric energy meter 8, the anti-ferroresonance self-power supply device of electronic combined mutual inductor comprises electronic type voltage transformer 1, damping resistance 2, energy supply transformer 3, isolating transformer 4A, rectification filtering voltage stabilizing circuit 4B, electronic current mutual inductor 6, the primary winding of described energy supply transformer 3 is connected in parallel on electronic type voltage transformer 1 two ends once after having one end series damping resistor 2 at least, the secondary coil of described energy supply transformer 3 meets described isolating transformer 4A, rectification filtering voltage stabilizing circuit 4B described in the secondary output termination of isolating transformer 4A, the output termination secondary voltage signal conversion circuit 5 of rectification filtering voltage stabilizing circuit 4B also provides working power for it, the secondary voltage signal output part of described electronic type voltage transformer 1 is connected with secondary voltage signal conversion circuit 5 input ends, the secondary voltage signal after the secondary voltage signal of electronic type voltage transformer 1 output is converted by secondary voltage signal conversion circuit 5 after output transform, one termination bus other end ground connection of the primary winding of electronic type voltage transformer 1, the secondary current signal output part connecting secondary current signal translation circuit 7 of electronic current mutual inductor 6, the secondary current signal after the secondary current signal of electronic current mutual inductor 6 outputs is converted by secondary current signal conversion circuit 7 after output transform, described rectification filtering voltage stabilizing circuit 4B is also connected with secondary current signal conversion circuit 7 and provides working power for it, described rectification filtering voltage stabilizing circuit 4B, secondary voltage signal conversion circuit 5, secondary current signal conversion circuit 7 connect respectively electronic electric energy meter 8,
One termination A phase bus of the primary winding of the electronic type voltage transformer 1 of one group of anti-ferroresonance self-power supply device of electronic combined mutual inductor, another termination B phase bus of the primary winding of this electronic type voltage transformer 1, once the connecting with A phase bus of the electronic current mutual inductor 6 of this group electronic combined mutual inductor anti-ferroresonance self-power supply device;
One termination C phase bus of the primary winding of the electronic type voltage transformer 1 of the anti-ferroresonance self-power supply device of another group electronic combined mutual inductor, another termination B phase bus of the primary winding of this electronic type voltage transformer 1, once the connecting with C phase bus of the electronic current mutual inductor 6 of this group electronic combined mutual inductor anti-ferroresonance self-power supply device.
Because the building form of damping circuit 2 is different, the present invention can adopt various embodiments, specific as follows:
Embodiment 1: referring to Fig. 3, described damping resistance 2 adopts linear resistance, and the primary winding of described energy supply transformer 3 is connected in parallel on electronic type voltage transformer 1 two ends once after having one end series connection linear resistance at least; The secondary coil of described energy supply transformer 3 meets described isolating transformer 4A, rectification filtering voltage stabilizing circuit 4B described in the secondary of isolating transformer 4A output termination, the output termination secondary voltage signal conversion circuit 5 of rectification filtering voltage stabilizing circuit 4B; The secondary voltage signal output part of described electronic type voltage transformer 1 is connected with secondary voltage signal conversion circuit 5 input ends, the secondary voltage signal after the secondary voltage signal of electronic type voltage transformer 1 output is converted by secondary voltage signal conversion circuit 5 after output transform.
Embodiment 2: referring to Fig. 4, described damping resistance 2 adopts posistor.The primary winding of described energy supply transformer 3 is connected in parallel on electronic type voltage transformer 1 two ends once after having one end series connection posistor at least; The secondary coil of described energy supply transformer 3 meets described isolating transformer 4A, rectification filtering voltage stabilizing circuit 4B described in the secondary of isolating transformer 4A output termination, the output termination secondary voltage signal conversion circuit 5 of rectification filtering voltage stabilizing circuit 4B; The secondary voltage signal output part of described electronic type voltage transformer 1 is connected with secondary voltage signal conversion circuit 5 input ends, the secondary voltage signal after the secondary voltage signal of electronic type voltage transformer 1 output is converted by secondary voltage signal conversion circuit 5 after output transform.
Embodiment 3: referring to Fig. 5, and the resistance in series that described damping resistance 2 adopts posistor and linear resistance to form.After the resistance in series that the primary winding of described energy supply transformer 3 has at least one end series connection posistor and linear resistance to form, be connected in parallel on electronic type voltage transformer 1 two ends once; The secondary coil of described energy supply transformer 3 meets described isolating transformer 4A, rectification filtering voltage stabilizing circuit 4B described in the secondary of isolating transformer 4A output termination, the output termination secondary voltage signal conversion circuit 5 of rectification filtering voltage stabilizing circuit 4B; The secondary voltage signal output part of described electronic type voltage transformer 1 is connected with secondary voltage signal conversion circuit 5 input ends, the secondary voltage signal after the secondary voltage signal of electronic type voltage transformer 1 output is converted by secondary voltage signal conversion circuit 5 after output transform.
Embodiment 4: referring to Fig. 6, described damping resistance 2 adopts posistor and linear resistance to form parallel resistance, and the primary winding of described energy supply transformer 3 is connected in parallel on electronic type voltage transformer 1 two ends once after having at least one end series connection to form parallel resistance by posistor and linear resistance; The secondary coil of described energy supply transformer 3 meets described isolating transformer 4A, rectification filtering voltage stabilizing circuit 4B described in the secondary of isolating transformer 4A output termination, the output termination secondary voltage signal conversion circuit 5 of rectification filtering voltage stabilizing circuit 4B; The secondary voltage signal output part of described electronic type voltage transformer 1 is connected with secondary voltage signal conversion circuit 5 input ends, the secondary voltage signal after the secondary voltage signal of electronic type voltage transformer 1 output is converted by secondary voltage signal conversion circuit 5 after output transform.
The anti-ferroresonance ultimate principle of the present invention is as follows:
Described energy supply transformer is the same with electromagnetic potential transformer, it is all the inductance element of ribbon core, excite the condition of ferroresonance identical, as: three-phase, unexpected combined floodgate, the singlephase earth fault of asynchronous switch-on, unloaded bus or power transmission sequence are not eliminated suddenly again etc., they have common feature, that is: shooting conditions is accidental, resonance occurs in the transient state process of electrical network, iron core is easily saturated, there is power-to-ground capacitance, add electrical network internal resistance very little, energy supply transformer equivalent resistance is also very little, while there is resonance, can equivalence become circuit as shown in Figure 1.Wherein r is the summation of the internal resistance of source and energy supply transformer equivalent resistance.When having while send out swashing, as unexpected combined floodgate or capacitor discharge, to the charging of energy supply transformer, because of the internal resistance of source, r is very little, and electric current is larger, and iron core occurs easily saturated, and the quality factor q value in loop is very high, easily produces the resonance current that surpasses hundreds of times rated exciting current.As series damping resistor R on winding of energy supply transformer, as shown in Figure 2, while there is again unexpected combined floodgate or capacitor discharge, because R is larger, charging current greatly reduces, and iron core is difficult for saturated, and the quality factor q value in loop reduces greatly, can not produce excessive resonance current, thereby reach the object of anti-ferroresonance.Because the present invention will get voltage signal and power taking can be placed on same position, be divided into again two different branch roads and transmit output, so can branch road series connection above not affect the accuracy of voltage signal compared with large resistance R because getting, although can affect the internal resistance of energy supply power supply, but the working power providing due to need is direct current, and power demand is generally not very big, can be easy to solve by mu balanced circuit, thereby can realize both anti-ferroresonances, without external working power, affect again the reliability of electric energy metrical, even can accomplish with existing electromagnetic transformer completely compatible.