The difference and characteristics of electromagnetic voltage transformers and capacitive voltage transformers are believed to be very clear to many people. Now we will use a 35kv busbar electromagnetic voltage transformer and a 200kv busbar capacitor voltage transformer to make a detailed explanation. . Electromagnetic voltage transformer, which is similar to a power transformer. The working principle of the electromagnetic voltage transformer is characterized in that the primary winding of the electromagnetic voltage transformer is directly connected in parallel to the primary circuit, the voltage on the primary winding depends on the voltage on the primary circuit, and the secondary winding is electrically coupled to the primary winding. It is through magnetic coupling. The secondary winding is usually connected to some instruments, instruments and protection devices. The capacity is generally between tens and hundreds of volts, so the load is small and constant, so the primary side of the voltage transformer can be regarded as a voltage source. Basically unaffected by secondary loads. In normal operation, the secondary side of the voltage transformer is basically in an open state due to the small load, and the secondary voltage of the voltage transformer is substantially equal to the secondary side induced electromotive force depending on the primary system voltage. Electromagnetic voltage transformers are classified in many ways. According to the dielectric medium, they can be divided into dry and oil type. According to the difference of the number of phases, they can be divided into single phase and three phase. According to the number of windings, they can be divided into two windings and three windings. Three windings; according to the different voltages they can withstand, they can be divided into semi-insulated and fully insulated voltage transformers. In practical applications, the single-phase three-winding or the four-winding is generally used. If the 35kV bus voltage transformer is a single-phase cast insulated electromagnetic voltage transformer, the excitation characteristics of the electromagnetic voltage transformer are nonlinear, and the neutral point offset, instantaneous arc grounding or reverse in the 35kV power system Under the excitation of the gate operation, it may form ferromagnetic resonance with the capacitance distributed by the power system. Therefore, the electromagnetic voltage transformer used adopts the harmonic elimination measure. As the transmission voltage of the power system increases, the volume of the electromagnetic voltage transformer becomes larger and larger, and the cost increases accordingly. Therefore, the 220kV voltage level should adopt a capacitive voltage transformer. According to this requirement, we use 220kV busbar capacitive voltage transformer. The capacitive type is called a capacitive voltage divider type voltage transformer. The working principle is shown in Figure 1. In the secondary circuit to be tested and the earth indirectly there is a capacitor group, the capacitor group is composed of C1 and C2, wherein the C2 is connected to the voltage transformer secondary load Z2, L is the compensation reactor, when the voltage transformer is running at no load U2 =U0=C1&TImes;U1/(C1+C2)=ηTVU1. The voltage U2 is proportional to the magnitude of its primary voltage U1 and has the same phase. When the voltage transformer has a load Z2, Figure 2 is an equivalent circuit diagram, where U0 is the no-load voltage, jwL is the impedance of the compensating reactor, and Z0 is the internal impedance of the voltage transformer Z0=1/jw(C1+C2), When jwL=Z0, that is, 1/w(C1+C2)=wL, Z0+jwL=0, U2=U0=ηTVU1, the secondary output voltage U2 of the voltage transformer is proportional to the magnitude of the primary side voltage U1, and the phase is the same. . 1) In addition to being a voltage transformer, it can also be divided into capacitors and coupling capacitors for high-frequency carrier communication. 2) The impulse insulation strength of the capacitive voltage transformer is higher than that of the electromagnetic type. 3) Small size, light weight, low cost and small floor space. 4) The error characteristics and transient characteristics are not as good as the electromagnetic type, and the output capacity is small. An electromagnetic voltage transformer is a voltage transformer that converts a primary voltage into a secondary voltage by electromagnetic induction. The transformer does not add other electrical components such as capacitors that change the primary voltage. A capacitive voltage transformer is a voltage transformer that draws a voltage from a series capacitor and then transforms it into a voltage source such as a meter or a relay protection. The capacitive voltage transformer can also couple the carrier frequency to the power line for long distance. Communication, remote measurement, selective line high frequency protection, remote control, teletype and so on. Therefore, compared with the conventional electromagnetic voltage transformer, the capacitive voltage transformer has many advantages in economy and safety in addition to preventing ferromagnetic resonance due to saturation of the voltage transformer core. Capacitive voltage transformers are mainly composed of a capacitor divider and a medium voltage transformer. The capacitor divider consists of a porcelain sleeve and a plurality of series capacitors mounted therein. The porcelain sleeve is filled with insulating oil maintaining a positive pressure of 0.1 MPa, and a steel bellows is used to balance different environments to maintain oil pressure. The capacitor partial pressure can be used as a coupling capacitor. Connect the carrier device. The medium voltage transformer consists of a transformer installed in the sealed oil tank, a compensating reactor and a damping device, and the space at the top of the fuel tank is filled with nitrogen. The primary winding is divided into a main winding and a fine-tuning winding, and a low-loss reactor is connected in series between the primary side and the primary winding. Since the nonlinear impedance and inherent capacitance of the capacitive voltage transformer sometimes cause ferromagnetic resonance in the capacitive voltage transformer, the damping device is used to suppress the resonance. The damping device is composed of a resistor and a reactor, and is connected across the secondary winding. Above, under normal circumstances, the damping device has a high impedance. When the ferromagnetic resonance causes an overvoltage, before the medium voltage transformer is affected, the reactor is saturated and only the resistive load is left, so that the oscillation energy is quickly reduced. We are the largest supplier of RELX in China. High quality 100% Original supply, wholesale price is reasonable
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Nic Content:
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Flavor:
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Puffs:Vape 600 Puffs
Relx Infinity Pod
Disposable:
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Basic Info.
Model NO.
relx Infinity pod
Name
Relx Vape Pod
Tank Capacity
1.8ml Capacity Relx Vape pod
MOQ
100PCS
Rechargeable Vape
Yes
Compatible
Veex & Sp2s & Vapemoho Mini
Transport Package
10 pieces in a large box
Trademark
veex cartridge
Origin
China
Product Description
High quality 1.8ml vape pod RELX infinity pod relx cartridge
Relx infinity Pod Specifications :
Pod Capacity:
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Wicking Material:
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Pod Weight:
6g
Pod Life Span:
Vape 600 Puffs
