JPH02193531A - Inspecting and testing device for synchronism indicating circuit - Google Patents

Abstract

PURPOSE:To effect synchronized closing safely without causing service interruption in an actually operating system by a method wherein an output is inputted from the secondary terminal of a potential transformer and synchronizing between voltages of the output is judged while the result of the judgement is compared with the result of judgement of a synchronism inspecting circuit in a private power receiving and transforming facility. CONSTITUTION:When an increased generator 58 is closed synchronizedly into a commercial bus 61, the secondary voltage of a potential transformer 53 and the secondary voltage of the same transformer 55 are inputted into a synchronism indicating circuit 51 to regulate the speed and the voltage of the generator 58 employing a voltage regulating command 42 while a synchronized closing command 41 is given to a synchronized breaker 56 when the synchronism indicating circuit 51 has judged that the secondary voltages of both potential transformers has coincided. An inspecting and testing device 48 takes out the voltages 43, 44 of both sides of the synchronized breaker 56 and inputs them into a sychronism indicating device 47 after reducing the voltages thereof by the potential transformers 45, 46 and effects the verification of the synchronism indicating circuit 51 by comparing the result of judgement of the synchronism indicating device 47 with the result of judgement of the synchronism indicating circuit 51.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a verification test device for a synchronization verification circuit used for synchronizing a generator and a generator or a generator and a power purchaser. It is something.

(Prior Art) A synchronization device is used to operate a generator of a private power receiving and transforming facility in parallel with another generator or a power purchaser.

This detects 9 voltage phases and 9 frequencies of the systems to be operated in parallel, and when they match, outputs a synchronization closing signal to the circuit breaker to cause it to operate in parallel.

Conventionally, in on-site testing of synchronization devices, main circuit phase detection and synchronization verification circuit tests are performed to perform actual parallel entry tests.

However, when adding new equipment to existing equipment, it may not be possible to perform a power outage to the existing equipment, so main circuit phase detection and synchronization verification circuit tests may not be able to be carried out sufficiently. Doing so may damage the equipment.

FIG. 5 is a single line diagram showing an example of equipment in which a generator is added.

In Fig. 5, 60 indicates two additional generator facilities, and the verification test is the main circuit phase detection test P of the additional facility.
Connection check of T53, 54 secondary and synchronization PT switching circuit 50, synchronous breakers 56, 57 and synchronization closing circuit 52
After checking the generators 58 and 59 and checking the generator speed adjustment and voltage adjustment output switching circuit 62, a synchronization test is performed.

In addition, when the generator 58 is synchronously connected to the power purchasing bus 61, the frequency is determined by the secondary voltage of PT53 and PT55.

The synchronization verification circuit 51 determines whether the two voltage phases match, and the synchronization circuit breaker 56 is closed by a synchronization closing signal output from the synchronization closing circuit 52.

The conditions required for synchronization are the frequency and voltage of the main circuit.

and phase matching.

(Problem M to be solved by the invention) However, with the above conventional method, there are cases where it is not possible to carry out an overall main circuit phase verification test due to reasons such as the power outage of the power purchase bus 61 not lasting for a long time. It is difficult to confirm a reliable match of the second order.

The present invention provides a main circuit phase detection and synchronization verification circuit without causing a power outage to the system in actual operation before the actual parallel entry test.

The object of the present invention is to provide a rational verification test device for a synchronization verification circuit that can perform reliable verification of the synchronization circuit and safely perform synchronization.

[Structure of the invention]

(Means and effects for solving problem 111) The present invention enables each primary side to be connected in place of the circuit breaker to the high-voltage connection portions on both sides to which circuit breakers to be synchronously closed in private power receiving and substation equipment are connected. A high-voltage section device that houses two sets of potential transformers having terminals and has terminals that allow their secondary sides to be connected to the outside; It consists of a synchronization test device that performs synchronization judgment between two sets of voltages and compares the judgment results with the judgment results of the synchronization test circuit in the private power receiving and substation equipment. A verification test was conducted on the synchronization circuit to ensure that the added system could be safely synchronized to the system currently in operation.

(Example) An embodiment of the present invention is shown in FIG.

FIG. 1 shows the connection of the verification test device when the generator 58 is synchronously connected to the power purchase bus 61 in the single line diagram of FIG. 5.

In Figure 1, the power receiving and substation equipment includes a 40-fold extension.
When adding the added generator 58 to the power purchase bus 61 in synchronization, the secondary of PT53 and the secondary of PT55 are input to the synchronization verification circuit 51, and the speed and voltage of the generator 58 are adjusted from the synchronization verification circuit 51. is performed using the generator speed equalization and voltage adjustment commands 42, and the synchronization verification circuit 51 determines that both PT secondary voltages match.

A synchronous closing command 41 is given to the synchronous breaker 56.

In this case, the verification test device 48 according to the invention takes out the voltage 43.44 on both sides of the synchronous circuit breaker 56 and determines the PT 45°46.
The synchronization verification circuit 51 is verified by comparing the determination result by the synchronization verification device v147 with the determination result by the synchronization detection circuit 51.

FIG. 2 shows a specific circuit configuration of the verification test device 48 according to the present invention, and FIG. 3 shows an outline drawing including the instrument arrangement.

In FIG. 3, 1 is a high-pressure part device, and a high-pressure connection part 2
A and 2D are connected to the primary sides of potential transformers 45 and 46, respectively.

The secondary voltage of the potential transformers 45, 46 is input to the synchronization verification device 47 via the connector 4, the cable 5 and the connector 6.

The synchronization verification device 47 includes a voltage changeover switch 7.9 and a digital voltmeter 8.9 for measuring the generator voltage and the purchased power voltage. IO is attached.

11 is a synchronization calibrator, 12 is a phase meter, 16A, 168.
16C is an external connection terminal that connects to the closed switchboard. Reference numeral 17 denotes a synchronization start lamp, which lights up when a synchronization start signal is input from the external connection terminal 16B.

Further, 15 is a push button for resetting the self-held synchronization input signal.

As shown in FIG. 3, the verification test device of the present invention is specifically composed of two parts: the high-voltage section device 1 and the synchronization verification device 47. The synchronous circuit breaker 56 in the closed switchboard is pulled out, and then the high voltage section device 1 is inserted.

When the high voltage section device 1 is inserted into the closed switchboard, the voltage of the 1 generator is transferred to the high voltage connection section 2A, as shown in FIG.

2B and 2C are charged, and the voltage of the purchased electricity is charged to the high voltage connections 2D, 2E, and 2F.

These voltages are applied to the primary sides of instrument transformers 45 and 46, respectively, and the secondary voltages are applied to connectors 4A-4F and cables 5. and is input to the synchronization verification device 47 through connectors 6A to 6F.

The generator voltage and the power purchase voltage are each set by a changeover switch 7.
9 and measured by digital voltmeters 8 and 10. Voltage synchronization between the generator and the purchased power is confirmed by a synchronization tester 11, and the voltage phase angle between the generator and the purchased power is measured by a phase meter 12.

When the synchronization input signal 41 is applied from the synchronization test circuit 51 to the external connection terminal 16B, the input signal receiving relay 13 is energized and self-held via the contacts 14 and the reset push button 15, and the synchronization input indicator lamp is activated. 17 is lit.

When the closing signal receiving relay 13 operates, its contact 19A
, 19B closes to stop the synchronization calibrator 11 and phase meter 12 from indicating.

In this way, when the synchronization input signal of the side to be verified is input to the external connection terminal 16B, the synchronization tester 11 and the phase meter 1
When 2 indicates the synchronization state, it can be verified that the synchronization verification and synchronization input circuits on the side to be verified are correct.

〔Effect of the invention〕

As explained above, according to the present invention, by inserting a high-voltage device into a closed switchboard instead of a synchronous breaker and connecting a synchronous closing signal, it is possible to verify the synchronization of power receiving and substation equipment and to ensure that the synchronous closing circuit is correct. This makes it possible to easily verify a system in operation without causing a power outage.

[Brief explanation of the drawing]

FIG. 1 is a single line diagram showing an embodiment of the invention, FIG. 2 is a circuit diagram showing a specific circuit configuration of the invention, and FIG. 3 is an outline drawing showing an example of the equipment arrangement of the invention. FIG. 4 is an internal layout diagram showing an example of a closed switchboard to which the present invention is applied, and FIG. 5 is a single line diagram showing a system configuration of power receiving and transforming equipment to which the present invention is applied. 1 High-voltage equipment High-voltage connection connector cable Digital voltmeter Synchronous calibrator Phase meter Closing signal reception Relay Reset push button Synchronizing closing display lamp Power receiving and transforming equipment 46, 53, 54, 55 Synchronous verification equipment Verification testing equipment Synchronous verification circuit Synchronous breaker power generation Machinery expansion equipment power purchase bus agent Patent attorney Noriyuki Chika Potential transformer (PT) 2A, 2D 4.6 8.10 45° 56.57 58.59 Figure 1 Yamashita Figure

Claims (1)

[Claims] In place of the circuit breakers, two sets of voltage transformers to which respective primary side terminals can be connected are housed in the high-voltage connections on both sides to which the circuit breakers to be synchronously turned on in the private power receiving and transforming equipment are connected. Input the outputs from the high voltage section device having the secondary side terminal connectable to the outside and the above two sets of secondary side terminals, and
A verification test device for a synchronous verification circuit comprising a synchronous verification device that performs synchronization determination between a set of voltages and compares the result with the determination result of a synchronous verification circuit in private power receiving and substation equipment.