CN2150564Y

CN2150564Y - Combined parametric testing device for electric power system

Info

Publication number: CN2150564Y
Application number: CN 93200423
Authority: CN
Inventors: 朱守真; 沈善德; 陆希鸣
Original assignee: Electric Motor Engineering And Applied Electronic Technology Department Qinghua
Current assignee: Electric Motor Engineering And Applied Electronic Technology Department Qinghua
Priority date: 1993-01-15
Filing date: 1993-01-15
Publication date: 1993-12-22
Anticipated expiration: 2003-01-15

Abstract

The utility model relates to a combined parametric testing device for electric power system which is used for identifying parameters of a synchronous machine and an excitation system. The combined parametric testing device for electric power system is provided with two ways of direct-current voltage transmitter, one way is an alternating voltage transmitter, and the other way is a current transmitter, which are separated with a direct port circuit, a three-way voltage transformer and a current transformer. The utility model combines the performance of the transmission of direct current and voltage, the transmission of alternating current voltage and the transmission of the varying quantity of voltage, and the functions, such as transformation, filtration, amplifying, isolation, direct current isolation, etc., for the tested quantity are achieved. The combined parametric testing device for electric power system has the advantage of high speed, good regulating performance, high precision, less power consumption and light weight and is capable of substituting for the existing domestic measuring device for measuring voltage or current.

Description

Combined parametric testing device for electric power system

The utility model relates to a kind of online new-type comprehensive measurement device that is used for electric system, particularly can realize the measurement mechanism of synchrodyne and excitation system parameter identification.

In present existing electric system transmitter measuring technique, what have can the measuring voltage amount, what have can measure the magnitude of current, but function all is single, and can not satisfy the on-line measurement for variable quantity required in the parameter testing, that is to say, up to the present, also do not have a kind of comprehensive electric system parameter measuring apparatus that can test multiple signal simultaneously, equipment is numerous and diverse when making on-the-spot test, poor reliability is carried also inconvenient.

Conventional voltage transmitter only adopts the method for single-phase measurement in voltage measurement, poor for applicability, and existing various transmitter exists the response time long, the deficiency that sensitivity is low, so can not satisfy the needs of on-line measurement, On-line Control.

The purpose of this utility model provides the online variable quantity of testing voltage, electric current and each electric weight of generator and excitation system simultaneously of a kind of energy, and can quick and precisely export required result's electric system parametric synthesis proving installation.

Carry out multiclass link parametric synthesis proving installation in electric system according to the utility model being used for of realizing, comprise panel and the casing of being furnished with connection terminal, a driving source that is used to produce pumping signal, this signal is sent into electric system to be measured, makes link to be measured produce response; At least two DC voltage transmitters; the isolation and the dividing potential drop that are used for DC voltage; one is used to produce an Alternative Voltage Converter that is equivalent to the DC voltage of input voltage root-mean-square value; a DC current transmitter that is used for geometric ratio in the small voltage gain amplifier of electric current; and at least No. eight interface circuits; the amount that electric system is introduced after each transmitter is handled is carried out protecting every direct sum; and one group of voltage transformer (VT) summation current transformer that is used to test synchrodyne set end voltage and bus current; the amount of drawing of interface circuit and all send into a data acquisition system (DAS) through the amount that described voltage transformer (VT) and current transformer directly carry out AC sampling outputs to signal processor then.

The working power of described device is three transformers that are triangularly arranged.The Alternative Voltage Converter input side of this proving installation is furnished with three auxiliary transformers

For of the interference of opposing magnetic field, in cabinet, install a shielding between transmitter and transformer and the mutual inductor additional and use iron plate proving installation.

Be furnished with at least 4 group input terminals behind the dish of described device, be used for input AC, DC voltage and electric current, be furnished with at least 4 group lead-out terminals, be used to export direct current, ac voltage signal.The panel of described device is furnished with a voltage table of measuring variable quantity, stirs selector switch, can monitor each road output signal.

Fig. 1 is a functional-block diagram of the present utility model;

Fig. 2 is the circuit theory diagrams of DC voltage transmitter;

Fig. 3 is the circuit theory diagrams of Alternative Voltage Converter;

Fig. 4 is the circuit theory diagrams of interface circuit.

In theory diagram of the present utility model shown in Figure 1, pumping signal is input to electric system link to be measured, the electric weight of introducing from electric system is behind the comprehensive test device isolated variable that voltage, current transducer are formed, insert data acquisition system (DAS) through interface arrangement, the interface circuit gating adopts the switch switching mode, and a part of ac electric directly carries out AC sampling through the amount of voltage transformer pt summation current transformer CT, through data acquisition system (DAS) output, sends into signal processor then.

The circuit of described comprehensive test device and interface circuit all adopts the high integration element, and circuit board wherein is to adopt the wiring of TANGO software.

Behind the DC voltage transmitter input end input voltage signal of Fig. 2, at first by the filtering amplifying element, convert the d. c. voltage signal direct ratio to frequency signal through Voltage-to-frequency Converter again, after isolating the isolation of transformation realization electricity, through F/V converter the conversion of frequency signal direct ratio ground is wired back again and press signal, output after filtering is amplified.In example of the utility model, its input signal is DC voltage 0～200V, and output is DC voltage 0～10V.

The Alternative Voltage Converter of Fig. 3 is imported three-phase alternating voltage simultaneously, and addition behind each line magnitude of voltage square obtains after the DC voltage evolution again, after filtering output to the end.Can obtain different gains by adjusting component parameters, can be adjusted to 100:10, promptly import the 100V alternating voltage, output 10V DC voltage.

The interface circuit of Fig. 4 is actually one every straight protective device, mainly comprises holding circuit, block isolating circuit and voltage follower circuit.Every straight holding circuit is to utilize a differentiating circuit to add a delay circuit, and what output obtained is the variable quantity of input, and wherein holding circuit is made up of insurance and a pair of stabilivolt, has insured metering function, and stabilivolt plays the pressure limiting effect.Block isolating circuit is actually a high-pass filtering circuit, elimination steady-state quantity wherein, and obtain the variable quantity that pumping signal causes.

The utility model device with power supply (+15V), the wiring of input and output signal is arranged on the base plate, adopt the socket mode to make test circuit and interface circuit and device power supply and various input simultaneously, output signal links, and integral layout is clear, is convenient to installation, maintenance and batch process.

Compare with existing procucts, it is fast that the utility model device has test speed, can test simultaneously multi-signal, volume Little, easy to carry, be convenient to the multiple volt point of on-the-spot test. Its maximum characteristics are that transmitter is short actuation time, and output waveform is stable, the precision height, and it is big to adapt to frequency range, especially is suitable for rapid sensitive, and voltage has the real-time measurement occasion of minor variations. Wherein the transmitter response time is less than 5ms, and like product is generally 300ms, and the DC voltage transmitter has the precision height, the advantage such as the good and on-load ability of isolation performance is strong; Alternative Voltage Converter adopts three-phase voltage to import simultaneously and gets the new method of root-mean-square value for exporting, belong at home initiative. In the interface circuit owing to before the differential delay circuit, added the one-level voltage follower, thereby strengthened antijamming capability and the on-load ability of block isolating circuit. This apparatus function is complete, and a complete set of synchronously AC and DC electric current and voltage amount of unit and the variable quantity of this tittle can be provided, and is furnished with the Interface Terminal with computer.

Claims

1, electric system parametric synthesis proving installation is characterized in that:

Comprise panel and the casing of being furnished with connection terminal;

A driving source is used to produce pumping signal and sends into electric system, makes electric system link to be measured produce response;

At least two DC voltage transmitters are used for isolating and dividing potential drop;

An Alternative Voltage Converter is used to produce a DC voltage that is equivalent to the input voltage root-mean-square value;

A DC current transmitter is used for voltage isolation and amplifies;

At least No. eight interface circuits, the electric weight that electric system is introduced are sent into interface circuit and are protected every direct sum after described each transmitter is handled, and eliminate the stable state electric weight;

One group of voltage transformer (VT) summation current transformer is used to test synchrodyne set end voltage and bus current;

The amount of drawing of interface circuit and all deliver to data acquisition system (DAS) through the amount that described voltage transformer (VT) and current transformer directly carry out AC sampling outputs to signal processor then.

2, parametric synthesis proving installation according to claim 1 is characterized in that: three transformers are housed in the device, are triangularly arranged, as the working power of device.

3, comprehensive test device according to claim 1 is characterized in that: the auxiliary transformer into described Alternative Voltage Converter input signal service also is housed.

4, according to any comprehensive test device in the claim 1 to 3, it is characterized in that: between proving installation and transformer and mutual inductor, a shielding baffle plate that is used to resist magnetic interference is housed also.

5, comprehensive test device according to claim 1 is characterized in that: the circuit board of described each transmitter and interface circuit is to adopt the wiring of TANGO software.

6, comprehensive test device according to claim 1, it is characterized in that: have connection terminal at least 4 groups that to import direct current, alternating voltage, electric current behind the dish, connection terminal at least 4 groups of every group of 6 binding post, 4 tunnel output direct currents, alternating voltage, every group of 6 binding posts.

7, comprehensive test device according to claim 1 is characterized in that: panel is furnished with a voltage table, and gauge outfit is designated as-10V～10V.