The invention discloses an electronic voltage transformer based on two capacitors and gap iron core type Rogowski coils. The electronic voltage transformer comprises the first high-voltage capacitor, the second high-voltage capacitor, a first closed-loop iron core with a gap, a second closed-loop iron core with a gap, a first primary coil, a second primary coil, a first secondary coil, a second secondary coil, a first annular shielding box with a via hole, a second annular shielding box with a via hole, a low-voltage arm resistor, a signal conditioning circuit, an analog-digital converter, a microprocessor and a communication interface. According to the transformer, a primary sensor is formed by the two capacitors and the gap iron core type Rogowski coils, measurement of primary voltages is achieved by calculating and processing two paths of signals output by the primary sensor, element nominal errors and accuracy errors caused by temperature drift of the primary sensor composed of a capacitive voltage divider, a resistance-capacitance voltage divider, one high-voltage capacitor and a minitype current transformer are avoided, the high-voltage capacitors can be monitored in an on-line mode, and long-term safe operation of the transformer is guaranteed.

Electronic voltage transformer based on two capacitors and gap iron core type Rogowski coils

The invention discloses a detection and calculation method for zero-sequence current, which is used for electric energy quality monitoring equipment The method comprises the following steps: detecting power grid current, so as to obtain an expression of power grid current value; decomposing the expression of power grid current value, so as to obtain an expression of fundamental wave current value; utilizing the expression of fundamental wave current value to obtain a calculation formula of zero-sequence current value, wherein the calculation formula of zero-sequence current value is as follows: i01=A01cos omega t+B01sin omega t, i01 is the zero-sequence current to be detected, A01 and B01 are scaling factors of the zero-sequence current, and omega is the angular frequency of the power grid current; calculating the scaling factors of the zero-sequence current, and calculating the real-time value of zero-sequence current according to the calculation formula of zero-sequence current Thus, according to the method, the electric energy quality monitoring equipment can quickly detect and calculate the real-time value of zero-sequence current in a power grid, and the calculated amount is small, so that the electric energy quality monitoring equipment can quickly track the needed zero-sequence current in the power grid to be convenient for real-time switching of rear-stage electric energy quality compensation equipment

Detection and calculation method for zero-sequence current

A device (1 ) is disclosed that comprises a plurality of resistive voltage dividers (23a, 23b) connected operationally between a supply line (L) and an electric earthing terminal (22; 32c) so as to form separate respective connection paths to the electrical earthing terminal (22; 32c), and a processing assembly connected to the outputs (26a, 26b) of said voltage dividers (23a, 23b) and designed to generate signals or data indicating the voltage of said supply line (L) The processing assembly comprises a plurality of separate processing modules (41 a, 42a, 43a; 41 b, 42b, 43b) each one coupled to a respective one of the connection paths and designed to generate respective signals or data indicating the voltage of said supply line (L)

An improved device for measuring the electric power drawn by a railway vehicle from a high-voltage electric supply line

An automatic tripping and anti-falling arrester and a lightning protection and fuse integrated combination device, wherein the arrester includes an insulator body (1), an arrester body (3) and an anti-falling member; the insulator body (1) is internally provided with a magnet adsorption surface (118); the arrester body (3) includes a disengagement unit (303) and a lightning conductor (302) arranged from top to bottom, wherein the disengagement unit (303) comprises a magnetically attracted trip module with a built-in magnet (313), the disengagement unit (303) is adsorbed on the magnet adsorption surface (118) when working; the aging of the lightning conductor (302) causes the thermal effect inside the magnetically attracted trip module, which makes the disengagement unit (303) separate from the adsorption surface of the magnet (313); the anti-falling member supports and prevents the arrester body (3) from falling when it falls from the working position. The solution uses the thermal effect generated by the magnetically attracted trip module of the disengagement unit (303) to heat the magnet (313) to make it lose the magnetic force after the aging of the lightning conductor (302), and realizes the automatic and reliable disengagement of the aging arrester and the fall prevention of the arrester after the disengagement, which ensures the safety of the power grid and facilitates the replacement of the arrester.

Automatic tripping and anti-falling arrester and a lightning protection and fuse integrated combination device

The utility model discloses a capacitive voltage divider type voltage sensor which comprises a first capacitor connected with a primary side voltage line and a shunt capacitor bank connected with the first capacitor. The output end of the shunt capacitor bank is connected with a secondary side voltage line. The shunt capacitor bank comprises two second capacitors having same parameters. Two leads are further comprised, wherein one lead is connected with the output end of the first capacitor, and the other lead is connected with the output end of the shunt capacitor bank. According to the utility model, advantages of small size, light weight, good voltage resistance, small temperature drift coefficient and high accuracy can be realized, the monitoring and sampling accuracy at a high voltage level can reach 1%, and the working temperature ranges from -40 DEG C to +85 DEG C.

Capacitive voltage divider type voltage sensor

The utility model discloses a magnetic type contact structure capable of being used for controlling on-off of a circuit in a circuit. The resistor comprises a shell, a magnet, a silicon carbide resistor disc, a conductor sheet, a conductive jacking piece, a conductive connecting screw and an insulating positioning pad are sequentially arranged in the shell from top to bottom, the lower end of theconductive connecting screw penetrates through the insulating positioning pad and the bottom of the shell and extends to the outer side, and a cover is installed at the top of the shell. According tothe utility model, the silicon carbide resistor disc is used as a main heating source for rapid demagnetization of the magnet, thereby realizing rapid demagnetization.

Magnetic contact structure capable of being used for controlling on-off of circuit in circuit

The invention discloses a method for measuring zero-sequence current in a three-phase ungrounded system. The method includes the following steps: step one, using current transformers with large transformation ratios to measure primary side three-phase current; step two, using the abovementioned current transformers to perform secondary side current three-phase synthesis; step three, using a micro current transformer with a small transformation ratio to measure the synthetic secondary side current to output small current; and step four, after connecting the output small current in the step three with a resistor, converting the output small current to output voltage which is converted to digital signals through an AD converter and sent to a detection device. According to the invention, the method for measuring a primary part of zero-sequence current adopts a large transformation ratio method, production is convenient, measuring accuracy is high, and small current can be measured; the resolution ratio of zero-sequence current measurement of a bus can be improved, and when a ground fault occurs in the bus, ground current of the ground fault can be precisely judged according to the method, thereby reducing power failure time caused by ground connection of the bus.

Method for measuring zero-sequence current in three-phase ungrounded system

The invention discloses a magnetic-attraction type contact structure capable of being used for controlling the on-off of a circuit in a circuit. The structure comprises a shell, a magnet, a silicon carbide resistor disc, a conductor disc, a conductive propping piece, a conductive connecting screw and an insulating positioning pad are sequentially arranged in the shell from top to bottom, the lowerend of the conductive connecting screw passes through the insulating positioning pad and the bottom portion of the shell and then is extended to the outer side, and the top portion of the shell is provided with a cover. According to the invention, the silicon carbide resistor disc is used as a main heating source for rapidly demagnetizing the magnet, so that rapid demagnetization is achieved.

Magnetic-attraction type contact structure capable of being used for controlling on-off of circuit in circuit

The utility model discloses a high pressure fusing, arrester integration equipment, it includes insulator cabin, fixed bolster, take shelter from the thunder trip gear, high -tension fuse, couple, high -pressure inlet wire, the position sets up the fixed bolster respectively under in on the insulator cabin, the fixed bolster of insulator cabin upper portion and lower part is connected with the high -tension fuse through high -pressure inlet wire, couple respectively, on the support of the fixed online pole of fixed bolster at insulator cabin middle part, lightning -arrest trip gear is put to the insulator under -deck. The utility model discloses automatic when breaking away from the installation of a type zinc oxide arrester cross arm of needs has been practiced thrift to cross arm of arrester and high -tension fuse sharing during the installation, the arrester became invalid when being taken off, and the arrester of light weight can be stood by operating personnel and taken off in subaerial relaxation, does not have the potential safety hazard of overweight production, the upper boom that also need not to cut off the power supply operation, and both safety can not cause loss of outage again.

High pressure fusing, arrester integration equipment

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