Table of Contents
Advertisement
8 COMMISSIONING TESTS
8 COMMISSIONING TESTS 8.1OVERVIEW
HAZARD may result if the product is not used for its intended purposes
CAUTION
Dangerously high voltages are present on the rear terminals of the relay. The voltages are capable of caus-
ing DEATH or SERIOUS INJURY. Use extreme caution and follow all safety rules when handling, testing, or
CAUTION
adjusting the equipment.
Do not open the secondary circuit of a live CT, since the high voltage produced is capable of causing
DEATH or SERIOUS INJURY, or damage to the CT insulation.
CAUTION
The relay uses components that are sensitive to electrostatic discharges. When handling the unit, care
must be taken to avoid contact with terminals at the rear of the relay.
CAUTION
Ensure that the control power applied to the relay, and the AC current and voltage input, match the ratings
specified on the relay nameplate. Do not apply current to the CT inputs in excess of the Time × Current
specified limits.
CAUTION
Ensure that the Logic Input wet contacts are connected to voltages less than the maximum voltage specifi-
cation of 300 V DC.
CAUTION
The following procedures can be used to verify the proper operation of the 750/760 Feeder Management Relay. Although
not a total functional verification, the tests in this chapter check the major operating points. Before commissioning the relay,
users should read Chapter 3 which provides important information about wiring, mounting, and safety concerns. One
should also become familiar with the relay as described in Chapters 2 and 5.
The test procedures outlined in this section are for field verification that the relay is operational and programmed as
required for the application. It is not necessary to field test every characteristic of every relay feature. The various features
are implemented in software, which is thoroughly tested at the factory. Our recommendation is to field test all of the input,
display, and output hardware, and features which are to be operational in the specific application.
The setpoints considered for the measurement of parameters and the operation of features are shown on the logic dia-
grams. All settings must be set to the application requirement by the user before beginning the tests. To facilitate testing it
is recommended that all functions be initially set to "Disabled". Every feature which will be used in the application should be
set to the required function for the test, then returned to "Disabled" at completion. Each feature can then be testing without
complications caused by operations of other features. At the completion of all tests each feature is then set as required.
The procedures for testing of common operations will not be repeated in every test. The common features, and the test pro-
cedure location are as follows:
•
Thermal Exponential Demand Characteristic: Measurement of Current Demand
•
Block Interval Demand Characteristic: Measurement of Current Demand
•
Rolling Interval Demand Characteristic: Measurement of Current Demand
•
Feature Function as "Trip", "Alarm", or "Control": Phase Time Overcurrent 1
•
Fixed Delay Timing: Phase Time Overcurrent 1
•
Front Panel RESET Key Resetting: Phase Time Overcurrent 1
•
Logic Input Resetting: Phase Time Overcurrent 1
•
Feature Blocking from Logic Inputs: Phase Time Overcurrent 1
•
Element Operation of Output Relays: Phase Time Overcurrent 1
•
Number Of Faulted Phases: Phase Instantaneous Overcurrent 1
•
Feature Function as "Trip + AR": Autoreclose (760 Only)
We also recommend that the procedures outlined in Section 8.7: Placing the Relay In Service on page 8–56 be performed
for all installations to verify proper operation and function of the equipment.
GE Multilin
Courtesy of NationalSwitchgear.com
750/760 Feeder Management Relay
8.1 OVERVIEW
8.1.1 SAFETY PRECAUTIONS
8.1.2 REQUIREMENTS
8-1
8
Advertisement
Table of Contents
